/*
  * The simplest mpeg encoder (well, it was the simplest!)

  * Copyright (c) 2000,2001 Fabrice Bellard

  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>

  *

  * 4MV & hq & B-frame encoding stuff by Michael Niedermayer <michaelni@gmx.at>
  *

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either

  * version 2.1 of the License, or (at your option) any later version.

  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.

  *

  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */

 /**

  * @file

  * The simplest mpeg encoder (well, it was the simplest!).

  */
 

 #include "libavutil/imgutils.h"

 #include "avcodec.h"
 #include "dsputil.h"

 #include "internal.h"

 #include "mathops.h"

 #include "mpegvideo.h"

 #include "mjpegenc.h"

 #include "msmpeg4.h"

 #include "xvmc_internal.h"

 #include "thread.h"

 #include <limits.h>

 //#undef NDEBUG
 //#include <assert.h>

 static void dct_unquantize_mpeg1_intra_c(MpegEncContext *s,

                                    DCTELEM *block, int n, int qscale);

 static void dct_unquantize_mpeg1_inter_c(MpegEncContext *s,

                                    DCTELEM *block, int n, int qscale);

 static void dct_unquantize_mpeg2_intra_c(MpegEncContext *s,
                                    DCTELEM *block, int n, int qscale);

 static void dct_unquantize_mpeg2_intra_bitexact(MpegEncContext *s,
                                    DCTELEM *block, int n, int qscale);

 static void dct_unquantize_mpeg2_inter_c(MpegEncContext *s,
                                    DCTELEM *block, int n, int qscale);

 static void dct_unquantize_h263_intra_c(MpegEncContext *s,

                                   DCTELEM *block, int n, int qscale);

 static void dct_unquantize_h263_inter_c(MpegEncContext *s,

                                   DCTELEM *block, int n, int qscale);

 
 //#define DEBUG
 

 static const uint8_t ff_default_chroma_qscale_table[32] = {
 //   0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15
      0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
     16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31

 };
 

 const uint8_t ff_mpeg1_dc_scale_table[128] = {
 //  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
     8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
     8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
     8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
     8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
     8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
     8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
     8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
     8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

 };
 

 static const uint8_t mpeg2_dc_scale_table1[128] = {
 //  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
     4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
     4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
     4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
     4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
     4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
     4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
     4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
     4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

 };
 

 static const uint8_t mpeg2_dc_scale_table2[128] = {
 //  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
     2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
     2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
     2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
     2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
     2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
     2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
     2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
     2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

 };
 

 static const uint8_t mpeg2_dc_scale_table3[128] = {
 //  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

 };
 

 const uint8_t *const ff_mpeg2_dc_scale_table[4] = {

     ff_mpeg1_dc_scale_table,
     mpeg2_dc_scale_table1,
     mpeg2_dc_scale_table2,
     mpeg2_dc_scale_table3,
 };
 

 const enum AVPixelFormat ff_pixfmt_list_420[] = {
     AV_PIX_FMT_YUV420P,
     AV_PIX_FMT_NONE

 };
 

 const enum AVPixelFormat ff_hwaccel_pixfmt_list_420[] = {

 #if CONFIG_H264_DXVA2_HWACCEL

     AV_PIX_FMT_DXVA2_VLD,

 #endif
 #if CONFIG_H264_VAAPI_HWACCEL

     AV_PIX_FMT_VAAPI_VLD,

 #endif
 #if CONFIG_H264_VDA_HWACCEL

     AV_PIX_FMT_VDA_VLD,

 #endif

     AV_PIX_FMT_YUV420P,
     AV_PIX_FMT_NONE

 };

 const uint8_t *avpriv_mpv_find_start_code(const uint8_t *av_restrict p,

                                           const uint8_t *end,

                                           uint32_t *av_restrict state)

 {

     int i;
 

     assert(p <= end);
     if (p >= end)

         return end;
 

     for (i = 0; i < 3; i++) {
         uint32_t tmp = *state << 8;
         *state = tmp + *(p++);
         if (tmp == 0x100 || p == end)

             return p;
     }
 

     while (p < end) {
         if      (p[-1] > 1      ) p += 3;
         else if (p[-2]          ) p += 2;
         else if (p[-3]|(p[-1]-1)) p++;
         else {

             p++;
             break;
         }
     }
 

     p = FFMIN(p, end) - 4;
     *state = AV_RB32(p);

     return p + 4;

 }
 

 /* init common dct for both encoder and decoder */

 av_cold int ff_dct_common_init(MpegEncContext *s)

 {

     ff_dsputil_init(&s->dsp, s->avctx);

     ff_videodsp_init(&s->vdsp, s->avctx->bits_per_raw_sample);

     s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_c;
     s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_c;
     s->dct_unquantize_mpeg1_intra = dct_unquantize_mpeg1_intra_c;
     s->dct_unquantize_mpeg1_inter = dct_unquantize_mpeg1_inter_c;
     s->dct_unquantize_mpeg2_intra = dct_unquantize_mpeg2_intra_c;

     if (s->flags & CODEC_FLAG_BITEXACT)

         s->dct_unquantize_mpeg2_intra = dct_unquantize_mpeg2_intra_bitexact;

     s->dct_unquantize_mpeg2_inter = dct_unquantize_mpeg2_inter_c;

 #if ARCH_X86
     ff_MPV_common_init_x86(s);

 #elif ARCH_ALPHA

     ff_MPV_common_init_axp(s);

 #elif ARCH_ARM

     ff_MPV_common_init_arm(s);

 #elif HAVE_ALTIVEC

     ff_MPV_common_init_altivec(s);

 #elif ARCH_BFIN

     ff_MPV_common_init_bfin(s);

 #endif

     /* load & permutate scantables

      * note: only wmv uses different ones
      */
     if (s->alternate_scan) {

         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);

     } else {

         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
     }

     ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
     ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);

     return 0;
 }
 

 void ff_copy_picture(Picture *dst, Picture *src)
 {

     *dst = *src;

     dst->f.type = FF_BUFFER_TYPE_COPY;

 }
 

 /**

  * Release a frame buffer

  */
 static void free_frame_buffer(MpegEncContext *s, Picture *pic)
 {

     /* WM Image / Screen codecs allocate internal buffers with different
      * dimensions / colorspaces; ignore user-defined callbacks for these. */
     if (s->codec_id != AV_CODEC_ID_WMV3IMAGE &&
         s->codec_id != AV_CODEC_ID_VC1IMAGE  &&
         s->codec_id != AV_CODEC_ID_MSS2)

         ff_thread_release_buffer(s->avctx, &pic->f);

     else

         avcodec_default_release_buffer(s->avctx, &pic->f);

     av_freep(&pic->f.hwaccel_picture_private);

 }
 

 int ff_mpv_frame_size_alloc(MpegEncContext *s, int linesize)
 {

     int alloc_size = FFALIGN(FFABS(linesize) + 64, 32);

 
     // edge emu needs blocksize + filter length - 1
     // (= 17x17 for  halfpel / 21x21 for  h264)

     // VC1 computes luma and chroma simultaneously and needs 19X19 + 9x9
     // at uvlinesize. It supports only YUV420 so 24x24 is enough

     // linesize * interlaced * MBsize

     FF_ALLOCZ_OR_GOTO(s->avctx, s->edge_emu_buffer, alloc_size * 4 * 24,

                       fail);
 

     FF_ALLOCZ_OR_GOTO(s->avctx, s->me.scratchpad, alloc_size * 4 * 16 * 2,

                       fail)
     s->me.temp         = s->me.scratchpad;
     s->rd_scratchpad   = s->me.scratchpad;
     s->b_scratchpad    = s->me.scratchpad;
     s->obmc_scratchpad = s->me.scratchpad + 16;
 
     return 0;
 fail:
     av_freep(&s->edge_emu_buffer);
     return AVERROR(ENOMEM);
 }
 

 /**

  * Allocate a frame buffer

  */
 static int alloc_frame_buffer(MpegEncContext *s, Picture *pic)
 {

     int r, ret;

     if (s->avctx->hwaccel) {

         assert(!pic->f.hwaccel_picture_private);

         if (s->avctx->hwaccel->priv_data_size) {

             pic->f.hwaccel_picture_private = av_mallocz(s->avctx->hwaccel->priv_data_size);
             if (!pic->f.hwaccel_picture_private) {

                 av_log(s->avctx, AV_LOG_ERROR, "alloc_frame_buffer() failed (hwaccel private data allocation)\n");
                 return -1;
             }
         }
     }
 

     if (s->codec_id != AV_CODEC_ID_WMV3IMAGE &&
         s->codec_id != AV_CODEC_ID_VC1IMAGE  &&
         s->codec_id != AV_CODEC_ID_MSS2)

         r = ff_thread_get_buffer(s->avctx, &pic->f);

     else

         r = avcodec_default_get_buffer(s->avctx, &pic->f);

     if (r < 0 || !pic->f.type || !pic->f.data[0]) {
         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed (%d %d %p)\n",
                r, pic->f.type, pic->f.data[0]);

         av_freep(&pic->f.hwaccel_picture_private);

         return -1;
     }
 

     if (s->linesize && (s->linesize   != pic->f.linesize[0] ||
                         s->uvlinesize != pic->f.linesize[1])) {
         av_log(s->avctx, AV_LOG_ERROR,
                "get_buffer() failed (stride changed)\n");

         free_frame_buffer(s, pic);
         return -1;
     }
 

     if (pic->f.linesize[1] != pic->f.linesize[2]) {

         av_log(s->avctx, AV_LOG_ERROR,
                "get_buffer() failed (uv stride mismatch)\n");

         free_frame_buffer(s, pic);
         return -1;
     }
 

     if (!s->edge_emu_buffer &&
         (ret = ff_mpv_frame_size_alloc(s, pic->f.linesize[0])) < 0) {
         av_log(s->avctx, AV_LOG_ERROR,
                "get_buffer() failed to allocate context scratch buffers.\n");
         free_frame_buffer(s, pic);
         return ret;
     }
 

     return 0;
 }
 
 /**

  * Allocate a Picture.

  * The pixels are allocated/set by calling get_buffer() if shared = 0

  */

 int ff_alloc_picture(MpegEncContext *s, Picture *pic, int shared)
 {
     const int big_mb_num = s->mb_stride * (s->mb_height + 1) + 1;
 
     // the + 1 is needed so memset(,,stride*height) does not sig11
 
     const int mb_array_size = s->mb_stride * s->mb_height;
     const int b8_array_size = s->b8_stride * s->mb_height * 2;
     const int b4_array_size = s->b4_stride * s->mb_height * 4;

     int i;

     int r = -1;

     if (shared) {

         assert(pic->f.data[0]);

         assert(pic->f.type == 0 || pic->f.type == FF_BUFFER_TYPE_SHARED);

         pic->f.type = FF_BUFFER_TYPE_SHARED;

     } else {

         assert(!pic->f.data[0]);

         if (alloc_frame_buffer(s, pic) < 0)

             return -1;
 

         s->linesize   = pic->f.linesize[0];
         s->uvlinesize = pic->f.linesize[1];

     }

     if (pic->f.qscale_table == NULL) {

         if (s->encoding) {

             FF_ALLOCZ_OR_GOTO(s->avctx, pic->mb_var,
                               mb_array_size * sizeof(int16_t), fail)
             FF_ALLOCZ_OR_GOTO(s->avctx, pic->mc_mb_var,
                               mb_array_size * sizeof(int16_t), fail)
             FF_ALLOCZ_OR_GOTO(s->avctx, pic->mb_mean,
                               mb_array_size * sizeof(int8_t ), fail)

         }

         FF_ALLOCZ_OR_GOTO(s->avctx, pic->f.mbskip_table,
                           mb_array_size * sizeof(uint8_t) + 2, fail)// the + 2 is for the slice end check
         FF_ALLOCZ_OR_GOTO(s->avctx, pic->qscale_table_base,
                           (big_mb_num + s->mb_stride) * sizeof(uint8_t),
                           fail)
         FF_ALLOCZ_OR_GOTO(s->avctx, pic->mb_type_base,
                           (big_mb_num + s->mb_stride) * sizeof(uint32_t),
                           fail)
         pic->f.mb_type = pic->mb_type_base + 2 * s->mb_stride + 1;
         pic->f.qscale_table = pic->qscale_table_base + 2 * s->mb_stride + 1;
         if (s->out_format == FMT_H264) {
             for (i = 0; i < 2; i++) {
                 FF_ALLOCZ_OR_GOTO(s->avctx, pic->motion_val_base[i],
                                   2 * (b4_array_size + 4) * sizeof(int16_t),
                                   fail)

                 pic->f.motion_val[i] = pic->motion_val_base[i] + 4;

                 FF_ALLOCZ_OR_GOTO(s->avctx, pic->f.ref_index[i],
                                   4 * mb_array_size * sizeof(uint8_t), fail)

             }

             pic->f.motion_subsample_log2 = 2;

         } else if (s->out_format == FMT_H263 || s->encoding ||
                    (s->avctx->debug & FF_DEBUG_MV) || s->avctx->debug_mv) {
             for (i = 0; i < 2; i++) {
                 FF_ALLOCZ_OR_GOTO(s->avctx, pic->motion_val_base[i],
                                   2 * (b8_array_size + 4) * sizeof(int16_t),
                                   fail)

                 pic->f.motion_val[i] = pic->motion_val_base[i] + 4;

                 FF_ALLOCZ_OR_GOTO(s->avctx, pic->f.ref_index[i],
                                   4 * mb_array_size * sizeof(uint8_t), fail)

             }

             pic->f.motion_subsample_log2 = 3;

         }

         if (s->avctx->debug&FF_DEBUG_DCT_COEFF) {
             FF_ALLOCZ_OR_GOTO(s->avctx, pic->f.dct_coeff,
                               64 * mb_array_size * sizeof(DCTELEM) * 6, fail)

         }

         pic->f.qstride = s->mb_stride;

         FF_ALLOCZ_OR_GOTO(s->avctx, pic->f.pan_scan,
                           1 * sizeof(AVPanScan), fail)

     }

     pic->owner2 = s;

     return 0;

 fail: // for  the FF_ALLOCZ_OR_GOTO macro
     if (r >= 0)

         free_frame_buffer(s, pic);

     return -1;
 }
 

 /**

  * Deallocate a picture.

  */

 static void free_picture(MpegEncContext *s, Picture *pic)
 {

     int i;

     if (pic->f.data[0] && pic->f.type != FF_BUFFER_TYPE_SHARED) {

         free_frame_buffer(s, pic);

     }
 

     av_freep(&pic->mb_var);
     av_freep(&pic->mc_mb_var);
     av_freep(&pic->mb_mean);

     av_freep(&pic->f.mbskip_table);

     av_freep(&pic->qscale_table_base);

     pic->f.qscale_table = NULL;

     av_freep(&pic->mb_type_base);

     pic->f.mb_type = NULL;

     av_freep(&pic->f.dct_coeff);
     av_freep(&pic->f.pan_scan);
     pic->f.mb_type = NULL;

     for (i = 0; i < 2; i++) {

         av_freep(&pic->motion_val_base[i]);

         av_freep(&pic->f.ref_index[i]);

         pic->f.motion_val[i] = NULL;

     }

     if (pic->f.type == FF_BUFFER_TYPE_SHARED) {

         for (i = 0; i < 4; i++) {

             pic->f.base[i] =
             pic->f.data[i] = NULL;

         }

         pic->f.type = 0;

     }
 }
 

 static int init_duplicate_context(MpegEncContext *s, MpegEncContext *base)
 {

     int y_size = s->b8_stride * (2 * s->mb_height + 1);
     int c_size = s->mb_stride * (s->mb_height + 1);
     int yc_size = y_size + 2 * c_size;

     int i;
 

     s->edge_emu_buffer =
     s->me.scratchpad   =
     s->me.temp         =
     s->rd_scratchpad   =
     s->b_scratchpad    =
     s->obmc_scratchpad = NULL;

     if (s->encoding) {

         FF_ALLOCZ_OR_GOTO(s->avctx, s->me.map,
                           ME_MAP_SIZE * sizeof(uint32_t), fail)
         FF_ALLOCZ_OR_GOTO(s->avctx, s->me.score_map,
                           ME_MAP_SIZE * sizeof(uint32_t), fail)
         if (s->avctx->noise_reduction) {
             FF_ALLOCZ_OR_GOTO(s->avctx, s->dct_error_sum,
                               2 * 64 * sizeof(int), fail)

         }

     }

     FF_ALLOCZ_OR_GOTO(s->avctx, s->blocks, 64 * 12 * 2 * sizeof(DCTELEM), fail)
     s->block = s->blocks[0];

     for (i = 0; i < 12; i++) {

         s->pblocks[i] = &s->block[i];

     }

     if (s->out_format == FMT_H263) {
         /* ac values */

         FF_ALLOCZ_OR_GOTO(s->avctx, s->ac_val_base,
                           yc_size * sizeof(int16_t) * 16, fail);

         s->ac_val[0] = s->ac_val_base + s->b8_stride + 1;
         s->ac_val[1] = s->ac_val_base + y_size + s->mb_stride + 1;
         s->ac_val[2] = s->ac_val[1] + c_size;
     }
 

     return 0;
 fail:

     return -1; // free() through ff_MPV_common_end()

 }
 

 static void free_duplicate_context(MpegEncContext *s)
 {
     if (s == NULL)
         return;

     av_freep(&s->edge_emu_buffer);

     av_freep(&s->me.scratchpad);

     s->me.temp =
     s->rd_scratchpad =
     s->b_scratchpad =
     s->obmc_scratchpad = NULL;

     av_freep(&s->dct_error_sum);
     av_freep(&s->me.map);
     av_freep(&s->me.score_map);
     av_freep(&s->blocks);

     av_freep(&s->ac_val_base);

     s->block = NULL;

 }
 

 static void backup_duplicate_context(MpegEncContext *bak, MpegEncContext *src)
 {
 #define COPY(a) bak->a = src->a

     COPY(edge_emu_buffer);
     COPY(me.scratchpad);

     COPY(me.temp);

     COPY(rd_scratchpad);
     COPY(b_scratchpad);
     COPY(obmc_scratchpad);
     COPY(me.map);
     COPY(me.score_map);
     COPY(blocks);
     COPY(block);
     COPY(start_mb_y);
     COPY(end_mb_y);
     COPY(me.map_generation);
     COPY(pb);
     COPY(dct_error_sum);

     COPY(dct_count[0]);
     COPY(dct_count[1]);

     COPY(ac_val_base);
     COPY(ac_val[0]);
     COPY(ac_val[1]);
     COPY(ac_val[2]);

 #undef COPY
 }
 

 int ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src)

 {

     MpegEncContext bak;

     int i, ret;

     // FIXME copy only needed parts
     // START_TIMER

     backup_duplicate_context(&bak, dst);
     memcpy(dst, src, sizeof(MpegEncContext));
     backup_duplicate_context(dst, &bak);

     for (i = 0; i < 12; i++) {

         dst->pblocks[i] = &dst->block[i];

     }

     if (!dst->edge_emu_buffer &&
         (ret = ff_mpv_frame_size_alloc(dst, dst->linesize)) < 0) {
         av_log(dst->avctx, AV_LOG_ERROR, "failed to allocate context "
                "scratch buffers.\n");
         return ret;
     }

     // STOP_TIMER("update_duplicate_context")
     // about 10k cycles / 0.01 sec for  1000frames on 1ghz with 2 threads

     return 0;

 }
 

 int ff_mpeg_update_thread_context(AVCodecContext *dst,
                                   const AVCodecContext *src)

 {

     int i;

     int err;

     MpegEncContext *s = dst->priv_data, *s1 = src->priv_data;
 

     if (dst == src)

         return 0;

     av_assert0(s != s1);
 

     // FIXME can parameters change on I-frames?
     // in that case dst may need a reinit
     if (!s->context_initialized) {

         memcpy(s, s1, sizeof(MpegEncContext));
 
         s->avctx                 = dst;
         s->bitstream_buffer      = NULL;
         s->bitstream_buffer_size = s->allocated_bitstream_buffer_size = 0;
 

         if (s1->context_initialized){
             s->picture_range_start  += MAX_PICTURE_COUNT;
             s->picture_range_end    += MAX_PICTURE_COUNT;

             if((err = ff_MPV_common_init(s)) < 0)
                 return err;

         }

     }
 

     if (s->height != s1->height || s->width != s1->width || s->context_reinit) {
         s->context_reinit = 0;
         s->height = s1->height;
         s->width  = s1->width;
         if ((err = ff_MPV_common_frame_size_change(s)) < 0)
             return err;
     }
 

     s->avctx->coded_height  = s1->avctx->coded_height;
     s->avctx->coded_width   = s1->avctx->coded_width;
     s->avctx->width         = s1->avctx->width;
     s->avctx->height        = s1->avctx->height;
 
     s->coded_picture_number = s1->coded_picture_number;
     s->picture_number       = s1->picture_number;
     s->input_picture_number = s1->input_picture_number;
 

     av_assert0(!s->picture || s->picture != s1->picture);

     memcpy(s->picture, s1->picture, s1->picture_count * sizeof(Picture));

     memcpy(&s->last_picture, &s1->last_picture,
            (char *) &s1->last_picture_ptr - (char *) &s1->last_picture);

     // reset s->picture[].f.extended_data to s->picture[].f.data
     for (i = 0; i < s->picture_count; i++)
         s->picture[i].f.extended_data = s->picture[i].f.data;
 

     s->last_picture_ptr    = REBASE_PICTURE(s1->last_picture_ptr,    s, s1);
     s->current_picture_ptr = REBASE_PICTURE(s1->current_picture_ptr, s, s1);
     s->next_picture_ptr    = REBASE_PICTURE(s1->next_picture_ptr,    s, s1);

     // Error/bug resilience

     s->next_p_frame_damaged = s1->next_p_frame_damaged;
     s->workaround_bugs      = s1->workaround_bugs;

     s->padding_bug_score    = s1->padding_bug_score;

     // MPEG4 timing info
     memcpy(&s->time_increment_bits, &s1->time_increment_bits,
            (char *) &s1->shape - (char *) &s1->time_increment_bits);
 
     // B-frame info
     s->max_b_frames = s1->max_b_frames;
     s->low_delay    = s1->low_delay;

     s->droppable    = s1->droppable;

 
     // DivX handling (doesn't work)
     s->divx_packed  = s1->divx_packed;
 
     if (s1->bitstream_buffer) {
         if (s1->bitstream_buffer_size +
             FF_INPUT_BUFFER_PADDING_SIZE > s->allocated_bitstream_buffer_size)
             av_fast_malloc(&s->bitstream_buffer,
                            &s->allocated_bitstream_buffer_size,
                            s1->allocated_bitstream_buffer_size);
             s->bitstream_buffer_size = s1->bitstream_buffer_size;
         memcpy(s->bitstream_buffer, s1->bitstream_buffer,
                s1->bitstream_buffer_size);
         memset(s->bitstream_buffer + s->bitstream_buffer_size, 0,
                FF_INPUT_BUFFER_PADDING_SIZE);

     }
 

     // linesize dependend scratch buffer allocation
     if (!s->edge_emu_buffer)
         if (s1->linesize) {
             if (ff_mpv_frame_size_alloc(s, s1->linesize) < 0) {
                 av_log(s->avctx, AV_LOG_ERROR, "Failed to allocate context "
                        "scratch buffers.\n");
                 return AVERROR(ENOMEM);
             }
         } else {
             av_log(s->avctx, AV_LOG_ERROR, "Context scratch buffers could not "
                    "be allocated due to unknown size.\n");
         }
 

     // MPEG2/interlacing info
     memcpy(&s->progressive_sequence, &s1->progressive_sequence,
            (char *) &s1->rtp_mode - (char *) &s1->progressive_sequence);

     if (!s1->first_field) {
         s->last_pict_type = s1->pict_type;
         if (s1->current_picture_ptr)
             s->last_lambda_for[s1->pict_type] = s1->current_picture_ptr->f.quality;

         if (s1->pict_type != AV_PICTURE_TYPE_B) {

             s->last_non_b_pict_type = s1->pict_type;

         }
     }
 
     return 0;
 }
 

 /**

  * Set the given MpegEncContext to common defaults

  * (same for encoding and decoding).

  * The changed fields will not depend upon the

  * prior state of the MpegEncContext.

  */

 void ff_MPV_common_defaults(MpegEncContext *s)

 {
     s->y_dc_scale_table      =
     s->c_dc_scale_table      = ff_mpeg1_dc_scale_table;
     s->chroma_qscale_table   = ff_default_chroma_qscale_table;
     s->progressive_frame     = 1;
     s->progressive_sequence  = 1;
     s->picture_structure     = PICT_FRAME;
 
     s->coded_picture_number  = 0;
     s->picture_number        = 0;
     s->input_picture_number  = 0;

 
     s->picture_in_gop_number = 0;

     s->f_code                = 1;
     s->b_code                = 1;

     s->picture_range_start   = 0;
     s->picture_range_end     = MAX_PICTURE_COUNT;

 
     s->slice_context_count   = 1;

 }
 
 /**

  * Set the given MpegEncContext to defaults for decoding.

  * the changed fields will not depend upon
  * the prior state of the MpegEncContext.

  */

 void ff_MPV_decode_defaults(MpegEncContext *s)

 {

     ff_MPV_common_defaults(s);

 }
 
 /**

  * Initialize and allocates MpegEncContext fields dependent on the resolution.
  */
 static int init_context_frame(MpegEncContext *s)
 {
     int y_size, c_size, yc_size, i, mb_array_size, mv_table_size, x, y;
 
     s->mb_width   = (s->width + 15) / 16;
     s->mb_stride  = s->mb_width + 1;
     s->b8_stride  = s->mb_width * 2 + 1;
     s->b4_stride  = s->mb_width * 4 + 1;
     mb_array_size = s->mb_height * s->mb_stride;
     mv_table_size = (s->mb_height + 2) * s->mb_stride + 1;
 
     /* set default edge pos, will be overriden
      * in decode_header if needed */
     s->h_edge_pos = s->mb_width * 16;
     s->v_edge_pos = s->mb_height * 16;
 
     s->mb_num     = s->mb_width * s->mb_height;
 
     s->block_wrap[0] =
     s->block_wrap[1] =
     s->block_wrap[2] =
     s->block_wrap[3] = s->b8_stride;
     s->block_wrap[4] =
     s->block_wrap[5] = s->mb_stride;
 
     y_size  = s->b8_stride * (2 * s->mb_height + 1);
     c_size  = s->mb_stride * (s->mb_height + 1);
     yc_size = y_size + 2   * c_size;
 

     FF_ALLOCZ_OR_GOTO(s->avctx, s->mb_index2xy, (s->mb_num + 1) * sizeof(int), fail); // error ressilience code looks cleaner with this

     for (y = 0; y < s->mb_height; y++)
         for (x = 0; x < s->mb_width; x++)
             s->mb_index2xy[x + y * s->mb_width] = x + y * s->mb_stride;
 

     s->mb_index2xy[s->mb_height * s->mb_width] = (s->mb_height - 1) * s->mb_stride + s->mb_width; // FIXME really needed?

 
     if (s->encoding) {
         /* Allocate MV tables */

         FF_ALLOCZ_OR_GOTO(s->avctx, s->p_mv_table_base,                 mv_table_size * 2 * sizeof(int16_t), fail)
         FF_ALLOCZ_OR_GOTO(s->avctx, s->b_forw_mv_table_base,            mv_table_size * 2 * sizeof(int16_t), fail)
         FF_ALLOCZ_OR_GOTO(s->avctx, s->b_back_mv_table_base,            mv_table_size * 2 * sizeof(int16_t), fail)
         FF_ALLOCZ_OR_GOTO(s->avctx, s->b_bidir_forw_mv_table_base,      mv_table_size * 2 * sizeof(int16_t), fail)
         FF_ALLOCZ_OR_GOTO(s->avctx, s->b_bidir_back_mv_table_base,      mv_table_size * 2 * sizeof(int16_t), fail)
         FF_ALLOCZ_OR_GOTO(s->avctx, s->b_direct_mv_table_base,          mv_table_size * 2 * sizeof(int16_t), fail)

         s->p_mv_table            = s->p_mv_table_base + s->mb_stride + 1;
         s->b_forw_mv_table       = s->b_forw_mv_table_base + s->mb_stride + 1;
         s->b_back_mv_table       = s->b_back_mv_table_base + s->mb_stride + 1;

         s->b_bidir_forw_mv_table = s->b_bidir_forw_mv_table_base + s->mb_stride + 1;
         s->b_bidir_back_mv_table = s->b_bidir_back_mv_table_base + s->mb_stride + 1;

         s->b_direct_mv_table     = s->b_direct_mv_table_base + s->mb_stride + 1;
 
         /* Allocate MB type table */

         FF_ALLOCZ_OR_GOTO(s->avctx, s->mb_type, mb_array_size * sizeof(uint16_t), fail) // needed for encoding

         FF_ALLOCZ_OR_GOTO(s->avctx, s->lambda_table, mb_array_size * sizeof(int), fail)

 
         FF_ALLOC_OR_GOTO(s->avctx, s->cplx_tab,
                          mb_array_size * sizeof(float), fail);
         FF_ALLOC_OR_GOTO(s->avctx, s->bits_tab,
                          mb_array_size * sizeof(float), fail);
 
     }
 
     FF_ALLOC_OR_GOTO(s->avctx, s->er_temp_buffer,
                      mb_array_size * sizeof(uint8_t), fail);
     FF_ALLOCZ_OR_GOTO(s->avctx, s->error_status_table,
                       mb_array_size * sizeof(uint8_t), fail);
 

     if (s->codec_id == AV_CODEC_ID_MPEG4 || (s->flags & CODEC_FLAG_INTERLACED_ME)) {

         /* interlaced direct mode decoding tables */
         for (i = 0; i < 2; i++) {
             int j, k;
             for (j = 0; j < 2; j++) {
                 for (k = 0; k < 2; k++) {
                     FF_ALLOCZ_OR_GOTO(s->avctx,
                                       s->b_field_mv_table_base[i][j][k],
                                       mv_table_size * 2 * sizeof(int16_t),
                                       fail);
                     s->b_field_mv_table[i][j][k] = s->b_field_mv_table_base[i][j][k] +
                                                    s->mb_stride + 1;
                 }

                 FF_ALLOCZ_OR_GOTO(s->avctx, s->b_field_select_table [i][j], mb_array_size * 2 * sizeof(uint8_t), fail)
                 FF_ALLOCZ_OR_GOTO(s->avctx, s->p_field_mv_table_base[i][j], mv_table_size * 2 * sizeof(int16_t), fail)
                 s->p_field_mv_table[i][j] = s->p_field_mv_table_base[i][j] + s->mb_stride + 1;

             }

             FF_ALLOCZ_OR_GOTO(s->avctx, s->p_field_select_table[i], mb_array_size * 2 * sizeof(uint8_t), fail)

         }
     }
     if (s->out_format == FMT_H263) {
         /* cbp values */
         FF_ALLOCZ_OR_GOTO(s->avctx, s->coded_block_base, y_size, fail);
         s->coded_block = s->coded_block_base + s->b8_stride + 1;
 
         /* cbp, ac_pred, pred_dir */

         FF_ALLOCZ_OR_GOTO(s->avctx, s->cbp_table     , mb_array_size * sizeof(uint8_t), fail);
         FF_ALLOCZ_OR_GOTO(s->avctx, s->pred_dir_table, mb_array_size * sizeof(uint8_t), fail);

     }
 
     if (s->h263_pred || s->h263_plus || !s->encoding) {
         /* dc values */
         // MN: we need these for  error resilience of intra-frames

         FF_ALLOCZ_OR_GOTO(s->avctx, s->dc_val_base, yc_size * sizeof(int16_t), fail);

         s->dc_val[0] = s->dc_val_base + s->b8_stride + 1;
         s->dc_val[1] = s->dc_val_base + y_size + s->mb_stride + 1;
         s->dc_val[2] = s->dc_val[1] + c_size;
         for (i = 0; i < yc_size; i++)
             s->dc_val_base[i] = 1024;
     }
 
     /* which mb is a intra block */
     FF_ALLOCZ_OR_GOTO(s->avctx, s->mbintra_table, mb_array_size, fail);
     memset(s->mbintra_table, 1, mb_array_size);
 
     /* init macroblock skip table */
     FF_ALLOCZ_OR_GOTO(s->avctx, s->mbskip_table, mb_array_size + 2, fail);
     // Note the + 1 is for  a quicker mpeg4 slice_end detection
 
     return 0;
 fail:
     return AVERROR(ENOMEM);
 }
 
 /**

  * init common structure for both encoder and decoder.
  * this assumes that some variables like width/height are already set
  */

 av_cold int ff_MPV_common_init(MpegEncContext *s)

 {

     int i;

     int nb_slices = (HAVE_THREADS &&
                      s->avctx->active_thread_type & FF_THREAD_SLICE) ?
                     s->avctx->thread_count : 1;
 
     if (s->encoding && s->avctx->slices)
         nb_slices = s->avctx->slices;

     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && !s->progressive_sequence)

         s->mb_height = (s->height + 31) / 32 * 2;

     else if (s->codec_id != AV_CODEC_ID_H264)

         s->mb_height = (s->height + 15) / 16;

     if (s->avctx->pix_fmt == AV_PIX_FMT_NONE) {

         av_log(s->avctx, AV_LOG_ERROR,

                "decoding to AV_PIX_FMT_NONE is not supported.\n");

         return -1;
     }
 

     if (nb_slices > MAX_THREADS || (nb_slices > s->mb_height && s->mb_height)) {
         int max_slices;
         if (s->mb_height)
             max_slices = FFMIN(MAX_THREADS, s->mb_height);
         else
             max_slices = MAX_THREADS;
         av_log(s->avctx, AV_LOG_WARNING, "too many threads/slices (%d),"
                " reducing to %d\n", nb_slices, max_slices);
         nb_slices = max_slices;

     }
 

     if ((s->width || s->height) &&
         av_image_check_size(s->width, s->height, 0, s->avctx))

         return -1;
 

     ff_dct_common_init(s);

     s->flags  = s->avctx->flags;
     s->flags2 = s->avctx->flags2;

     /* set chroma shifts */

     avcodec_get_chroma_sub_sample(s->avctx->pix_fmt,
                                   &s->chroma_x_shift,
                                   &s->chroma_y_shift);

     /* convert fourcc to upper case */

     s->codec_tag        = avpriv_toupper4(s->avctx->codec_tag);
     s->stream_codec_tag = avpriv_toupper4(s->avctx->stream_codec_tag);

     s->avctx->coded_frame = &s->current_picture.f;

     if (s->encoding) {

         if (s->msmpeg4_version) {
             FF_ALLOCZ_OR_GOTO(s->avctx, s->ac_stats,
                                 2 * 2 * (MAX_LEVEL + 1) *
                                 (MAX_RUN + 1) * 2 * sizeof(int), fail);

         }

         FF_ALLOCZ_OR_GOTO(s->avctx, s->avctx->stats_out, 256, fail);

         FF_ALLOCZ_OR_GOTO(s->avctx, s->q_intra_matrix,          64 * 32   * sizeof(int), fail)
         FF_ALLOCZ_OR_GOTO(s->avctx, s->q_chroma_intra_matrix,   64 * 32   * sizeof(int), fail)
         FF_ALLOCZ_OR_GOTO(s->avctx, s->q_inter_matrix,          64 * 32   * sizeof(int), fail)
         FF_ALLOCZ_OR_GOTO(s->avctx, s->q_intra_matrix16,        64 * 32 * 2 * sizeof(uint16_t), fail)
         FF_ALLOCZ_OR_GOTO(s->avctx, s->q_chroma_intra_matrix16, 64 * 32 * 2 * sizeof(uint16_t), fail)
         FF_ALLOCZ_OR_GOTO(s->avctx, s->q_inter_matrix16,        64 * 32 * 2 * sizeof(uint16_t), fail)
         FF_ALLOCZ_OR_GOTO(s->avctx, s->input_picture,           MAX_PICTURE_COUNT * sizeof(Picture *), fail)
         FF_ALLOCZ_OR_GOTO(s->avctx, s->reordered_input_picture, MAX_PICTURE_COUNT * sizeof(Picture *), fail)

         if (s->avctx->noise_reduction) {
             FF_ALLOCZ_OR_GOTO(s->avctx, s->dct_offset, 2 * 64 * sizeof(uint16_t), fail);

         }

     }

     s->picture_count = MAX_PICTURE_COUNT * FFMAX(1, s->avctx->thread_count);

     FF_ALLOCZ_OR_GOTO(s->avctx, s->picture,
                       s->picture_count * sizeof(Picture), fail);
     for (i = 0; i < s->picture_count; i++) {

         avcodec_get_frame_defaults(&s->picture[i].f);

     }

         if (init_context_frame(s))

             goto fail;

         s->parse_context.state = -1;

         s->context_initialized = 1;
         s->thread_context[0]   = s;

 //     if (s->width && s->height) {

         if (nb_slices > 1) {
             for (i = 1; i < nb_slices; i++) {

                 s->thread_context[i] = av_malloc(sizeof(MpegEncContext));
                 memcpy(s->thread_context[i], s, sizeof(MpegEncContext));
             }

             for (i = 0; i < nb_slices; i++) {

                 if (init_duplicate_context(s->thread_context[i], s) < 0)
                     goto fail;
                     s->thread_context[i]->start_mb_y =

                         (s->mb_height * (i) + nb_slices / 2) / nb_slices;

                     s->thread_context[i]->end_mb_y   =

                         (s->mb_height * (i + 1) + nb_slices / 2) / nb_slices;

             }
         } else {
             if (init_duplicate_context(s, s) < 0)

                 goto fail;

             s->start_mb_y = 0;
             s->end_mb_y   = s->mb_height;

         }

         s->slice_context_count = nb_slices;

 //     }

     return 0;
  fail:

     ff_MPV_common_end(s);

     return -1;
 }
 

 /**
  * Frees and resets MpegEncContext fields depending on the resolution.
  * Is used during resolution changes to avoid a full reinitialization of the
  * codec.
  */
 static int free_context_frame(MpegEncContext *s)

 {

     int i, j, k;

     av_freep(&s->mb_type);

     av_freep(&s->p_mv_table_base);
     av_freep(&s->b_forw_mv_table_base);
     av_freep(&s->b_back_mv_table_base);
     av_freep(&s->b_bidir_forw_mv_table_base);
     av_freep(&s->b_bidir_back_mv_table_base);
     av_freep(&s->b_direct_mv_table_base);

     s->p_mv_table            = NULL;
     s->b_forw_mv_table       = NULL;
     s->b_back_mv_table       = NULL;
     s->b_bidir_forw_mv_table = NULL;
     s->b_bidir_back_mv_table = NULL;
     s->b_direct_mv_table     = NULL;
     for (i = 0; i < 2; i++) {
         for (j = 0; j < 2; j++) {
             for (k = 0; k < 2; k++) {

                 av_freep(&s->b_field_mv_table_base[i][j][k]);

                 s->b_field_mv_table[i][j][k] = NULL;

             }
             av_freep(&s->b_field_select_table[i][j]);
             av_freep(&s->p_field_mv_table_base[i][j]);

             s->p_field_mv_table[i][j] = NULL;

         }
         av_freep(&s->p_field_select_table[i]);
     }

     av_freep(&s->dc_val_base);
     av_freep(&s->coded_block_base);

     av_freep(&s->mbintra_table);

     av_freep(&s->cbp_table);
     av_freep(&s->pred_dir_table);

     av_freep(&s->mbskip_table);

     av_freep(&s->error_status_table);

     av_freep(&s->er_temp_buffer);

     av_freep(&s->mb_index2xy);

     av_freep(&s->lambda_table);

     av_freep(&s->cplx_tab);
     av_freep(&s->bits_tab);
 
     s->linesize = s->uvlinesize = 0;
 
     for (i = 0; i < 3; i++)
         av_freep(&s->visualization_buffer[i]);
 
     return 0;
 }
 

 int ff_MPV_common_frame_size_change(MpegEncContext *s)
 {
     int i, err = 0;
 
     if (s->slice_context_count > 1) {
         for (i = 0; i < s->slice_context_count; i++) {
             free_duplicate_context(s->thread_context[i]);
         }
         for (i = 1; i < s->slice_context_count; i++) {
             av_freep(&s->thread_context[i]);
         }
     } else
         free_duplicate_context(s);
 
     free_context_frame(s);
 
     if (s->picture)
         for (i = 0; i < s->picture_count; i++) {
                 s->picture[i].needs_realloc = 1;
         }
 
     s->last_picture_ptr         =
     s->next_picture_ptr         =
     s->current_picture_ptr      = NULL;
 
     // init
     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && !s->progressive_sequence)
         s->mb_height = (s->height + 31) / 32 * 2;
     else if (s->codec_id != AV_CODEC_ID_H264)
         s->mb_height = (s->height + 15) / 16;
 
     if ((s->width || s->height) &&
         av_image_check_size(s->width, s->height, 0, s->avctx))
         return AVERROR_INVALIDDATA;
 
     if ((err = init_context_frame(s)))
         goto fail;
 
     s->thread_context[0]   = s;
 
     if (s->width && s->height) {
         int nb_slices = s->slice_context_count;
         if (nb_slices > 1) {
             for (i = 1; i < nb_slices; i++) {
                 s->thread_context[i] = av_malloc(sizeof(MpegEncContext));
                 memcpy(s->thread_context[i], s, sizeof(MpegEncContext));
             }
 
             for (i = 0; i < nb_slices; i++) {
                 if (init_duplicate_context(s->thread_context[i], s) < 0)
                     goto fail;
                     s->thread_context[i]->start_mb_y =
                         (s->mb_height * (i) + nb_slices / 2) / nb_slices;
                     s->thread_context[i]->end_mb_y   =
                         (s->mb_height * (i + 1) + nb_slices / 2) / nb_slices;
             }
         } else {
             if (init_duplicate_context(s, s) < 0)
                 goto fail;
             s->start_mb_y = 0;
             s->end_mb_y   = s->mb_height;
         }
         s->slice_context_count = nb_slices;
     }
 
     return 0;
  fail:
     ff_MPV_common_end(s);
     return err;
 }
 

 /* init common structure for both encoder and decoder */
 void ff_MPV_common_end(MpegEncContext *s)
 {
     int i;
 
     if (s->slice_context_count > 1) {
         for (i = 0; i < s->slice_context_count; i++) {
             free_duplicate_context(s->thread_context[i]);
         }
         for (i = 1; i < s->slice_context_count; i++) {
             av_freep(&s->thread_context[i]);
         }
         s->slice_context_count = 1;
     } else free_duplicate_context(s);
 
     av_freep(&s->parse_context.buffer);
     s->parse_context.buffer_size = 0;
 
     av_freep(&s->bitstream_buffer);
     s->allocated_bitstream_buffer_size = 0;
 
     av_freep(&s->avctx->stats_out);
     av_freep(&s->ac_stats);
 

     if(s->q_chroma_intra_matrix   != s->q_intra_matrix  ) av_freep(&s->q_chroma_intra_matrix);
     if(s->q_chroma_intra_matrix16 != s->q_intra_matrix16) av_freep(&s->q_chroma_intra_matrix16);
     s->q_chroma_intra_matrix=   NULL;
     s->q_chroma_intra_matrix16= NULL;

     av_freep(&s->q_intra_matrix);
     av_freep(&s->q_inter_matrix);

     av_freep(&s->q_intra_matrix16);
     av_freep(&s->q_inter_matrix16);

     av_freep(&s->input_picture);
     av_freep(&s->reordered_input_picture);

     av_freep(&s->dct_offset);

     if (s->picture && !s->avctx->internal->is_copy) {
         for (i = 0; i < s->picture_count; i++) {

             free_picture(s, &s->picture[i]);
         }

     }

     av_freep(&s->picture);

 
     free_context_frame(s);
 

     if (!(s->avctx->active_thread_type & FF_THREAD_FRAME))
         avcodec_default_free_buffers(s->avctx);
 

     s->context_initialized      = 0;
     s->last_picture_ptr         =
     s->next_picture_ptr         =
     s->current_picture_ptr      = NULL;
     s->linesize = s->uvlinesize = 0;

 }
 

 void ff_init_rl(RLTable *rl,
                 uint8_t static_store[2][2 * MAX_RUN + MAX_LEVEL + 3])

 {

     int8_t  max_level[MAX_RUN + 1], max_run[MAX_LEVEL + 1];
     uint8_t index_run[MAX_RUN + 1];

     int last, run, level, start, end, i;
 

     /* If table is static, we can quit if rl->max_level[0] is not NULL */

     if (static_store && rl->max_level[0])

         return;
 

     /* compute max_level[], max_run[] and index_run[] */

     for (last = 0; last < 2; last++) {

         if (last == 0) {
             start = 0;
             end = rl->last;
         } else {
             start = rl->last;
             end = rl->n;
         }
 
         memset(max_level, 0, MAX_RUN + 1);
         memset(max_run, 0, MAX_LEVEL + 1);
         memset(index_run, rl->n, MAX_RUN + 1);

         for (i = start; i < end; i++) {
             run   = rl->table_run[i];

             level = rl->table_level[i];
             if (index_run[run] == rl->n)
                 index_run[run] = i;
             if (level > max_level[run])
                 max_level[run] = level;
             if (run > max_run[level])
                 max_run[level] = run;
         }

         if (static_store)

             rl->max_level[last] = static_store[last];

         else
             rl->max_level[last] = av_malloc(MAX_RUN + 1);

         memcpy(rl->max_level[last], max_level, MAX_RUN + 1);

         if (static_store)
             rl->max_run[last]   = static_store[last] + MAX_RUN + 1;

         else

             rl->max_run[last]   = av_malloc(MAX_LEVEL + 1);

         memcpy(rl->max_run[last], max_run, MAX_LEVEL + 1);

         if (static_store)

             rl->index_run[last] = static_store[last] + MAX_RUN + MAX_LEVEL + 2;

         else
             rl->index_run[last] = av_malloc(MAX_RUN + 1);

         memcpy(rl->index_run[last], index_run, MAX_RUN + 1);
     }
 }
 

 void ff_init_vlc_rl(RLTable *rl)

 {
     int i, q;
 

     for (q = 0; q < 32; q++) {
         int qmul = q * 2;
         int qadd = (q - 1) | 1;

         if (q == 0) {
             qmul = 1;
             qadd = 0;

         }

         for (i = 0; i < rl->vlc.table_size; i++) {
             int code = rl->vlc.table[i][0];
             int len  = rl->vlc.table[i][1];

             int level, run;
 

             if (len == 0) { // illegal code
                 run   = 66;
                 level = MAX_LEVEL;
             } else if (len < 0) { // more bits needed
                 run   = 0;
                 level = code;
             } else {
                 if (code == rl->n) { // esc
                     run   = 66;
                     level =  0;
                 } else {
                     run   = rl->table_run[code] + 1;
                     level = rl->table_level[code] * qmul + qadd;
                     if (code >= rl->last) run += 192;

                 }
             }

             rl->rl_vlc[q][i].len   = len;
             rl->rl_vlc[q][i].level = level;
             rl->rl_vlc[q][i].run   = run;

         }
     }
 }
 

 void ff_release_unused_pictures(MpegEncContext*s, int remove_current)

 {
     int i;
 
     /* release non reference frames */

     for (i = 0; i < s->picture_count; i++) {
         if (s->picture[i].f.data[0] && !s->picture[i].f.reference &&
             (!s->picture[i].owner2 || s->picture[i].owner2 == s) &&
             (remove_current || &s->picture[i] !=  s->current_picture_ptr)
             /* && s->picture[i].type!= FF_BUFFER_TYPE_SHARED */) {

             free_frame_buffer(s, &s->picture[i]);
         }
     }
 }
 

 static inline int pic_is_unused(MpegEncContext *s, Picture *pic)
 {
     if (pic->f.data[0] == NULL)
         return 1;

     if (pic->needs_realloc && !(pic->f.reference & DELAYED_PIC_REF))

         if (!pic->owner2 || pic->owner2 == s)
             return 1;
     return 0;
 }
 
 static int find_unused_picture(MpegEncContext *s, int shared)

 {

     int i;

     if (shared) {
         for (i = s->picture_range_start; i < s->picture_range_end; i++) {

             if (s->picture[i].f.data[0] == NULL && s->picture[i].f.type == 0)
                 return i;

         }

     } else {
         for (i = s->picture_range_start; i < s->picture_range_end; i++) {

             if (pic_is_unused(s, &s->picture[i]) && s->picture[i].f.type != 0)

                 return i; // FIXME

         }

         for (i = s->picture_range_start; i < s->picture_range_end; i++) {

             if (pic_is_unused(s, &s->picture[i]))

                 return i;

         }
     }
 

     av_log(s->avctx, AV_LOG_FATAL,
            "Internal error, picture buffer overflow\n");
     /* We could return -1, but the codec would crash trying to draw into a
      * non-existing frame anyway. This is safer than waiting for a random crash.
      * Also the return of this is never useful, an encoder must only allocate
      * as much as allowed in the specification. This has no relationship to how
      * much libavcodec could allocate (and MAX_PICTURE_COUNT is always large
      * enough for such valid streams).
      * Plus, a decoder has to check stream validity and remove frames if too
      * many reference frames are around. Waiting for "OOM" is not correct at
      * all. Similarly, missing reference frames have to be replaced by
      * interpolated/MC frames, anything else is a bug in the codec ...
      */
     abort();
     return -1;

 }
 

 int ff_find_unused_picture(MpegEncContext *s, int shared)
 {
     int ret = find_unused_picture(s, shared);
 
     if (ret >= 0 && ret < s->picture_range_end) {
         if (s->picture[ret].needs_realloc) {
             s->picture[ret].needs_realloc = 0;
             free_picture(s, &s->picture[ret]);
             avcodec_get_frame_defaults(&s->picture[ret].f);
         }
     }
     return ret;
 }
 

 static void update_noise_reduction(MpegEncContext *s)
 {

     int intra, i;
 

     for (intra = 0; intra < 2; intra++) {
         if (s->dct_count[intra] > (1 << 16)) {
             for (i = 0; i < 64; i++) {
                 s->dct_error_sum[intra][i] >>= 1;

             }
             s->dct_count[intra] >>= 1;
         }

         for (i = 0; i < 64; i++) {
             s->dct_offset[intra][i] = (s->avctx->noise_reduction *
                                        s->dct_count[intra] +
                                        s->dct_error_sum[intra][i] / 2) /
                                       (s->dct_error_sum[intra][i] + 1);

         }
     }
 }
 

 /**

  * generic function for encode/decode called after coding/decoding
  * the header and before a frame is coded/decoded.

  */

 int ff_MPV_frame_start(MpegEncContext *s, AVCodecContext *avctx)

 {

     int i;

     Picture *pic;

     s->mb_skipped = 0;

     if (!ff_thread_can_start_frame(avctx)) {
         av_log(avctx, AV_LOG_ERROR, "Attempt to start a frame outside SETUP state\n");
         return -1;
     }
 

     /* mark & release old frames */

     if (s->out_format != FMT_H264 || s->codec_id == AV_CODEC_ID_SVQ3) {

         if (s->pict_type != AV_PICTURE_TYPE_B && s->last_picture_ptr &&
             s->last_picture_ptr != s->next_picture_ptr &&
             s->last_picture_ptr->f.data[0]) {

             if (s->last_picture_ptr->owner2 == s)
                 free_frame_buffer(s, s->last_picture_ptr);

         }

         /* release forgotten pictures */
         /* if (mpeg124/h263) */
         if (!s->encoding) {
             for (i = 0; i < s->picture_count; i++) {
                 if (s->picture[i].owner2 == s && s->picture[i].f.data[0] &&
                     &s->picture[i] != s->last_picture_ptr &&
                     &s->picture[i] != s->next_picture_ptr &&

                     s->picture[i].f.reference && !s->picture[i].needs_realloc) {

                     if (!(avctx->active_thread_type & FF_THREAD_FRAME))
                         av_log(avctx, AV_LOG_ERROR,
                                "releasing zombie picture\n");
                     free_frame_buffer(s, &s->picture[i]);

                 }
             }

         }

     }

     if (!s->encoding) {

         ff_release_unused_pictures(s, 1);

         if (s->current_picture_ptr &&
             s->current_picture_ptr->f.data[0] == NULL) {
             // we already have a unused image
             // (maybe it was set before reading the header)
             pic = s->current_picture_ptr;
         } else {
             i   = ff_find_unused_picture(s, 0);

             if (i < 0) {
                 av_log(s->avctx, AV_LOG_ERROR, "no frame buffer available\n");

                 return i;

             }

             pic = &s->picture[i];

         }
 

         pic->f.reference = 0;

         if (!s->droppable) {

             if (s->codec_id == AV_CODEC_ID_H264)

                 pic->f.reference = s->picture_structure;

             else if (s->pict_type != AV_PICTURE_TYPE_B)

                 pic->f.reference = 3;

         }

         pic->f.coded_picture_number = s->coded_picture_number++;

         if (ff_alloc_picture(s, pic, 0) < 0)

             return -1;

         s->current_picture_ptr = pic;
         // FIXME use only the vars from current_pic

         s->current_picture_ptr->f.top_field_first = s->top_field_first;

         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO ||
             s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {

             if (s->picture_structure != PICT_FRAME)
                 s->current_picture_ptr->f.top_field_first =
                     (s->picture_structure == PICT_TOP_FIELD) == s->first_field;

         }

         s->current_picture_ptr->f.interlaced_frame = !s->progressive_frame &&
                                                      !s->progressive_sequence;
         s->current_picture_ptr->field_picture      =  s->picture_structure != PICT_FRAME;

     }

     s->current_picture_ptr->f.pict_type = s->pict_type;

     // if (s->flags && CODEC_FLAG_QSCALE)
     //     s->current_picture_ptr->quality = s->new_picture_ptr->quality;

     s->current_picture_ptr->f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;

     ff_copy_picture(&s->current_picture, s->current_picture_ptr);

     if (s->pict_type != AV_PICTURE_TYPE_B) {

         s->last_picture_ptr = s->next_picture_ptr;

         if (!s->droppable)

             s->next_picture_ptr = s->current_picture_ptr;

     }

     av_dlog(s->avctx, "L%p N%p C%p L%p N%p C%p type:%d drop:%d\n",
             s->last_picture_ptr, s->next_picture_ptr,s->current_picture_ptr,
             s->last_picture_ptr    ? s->last_picture_ptr->f.data[0]    : NULL,
             s->next_picture_ptr    ? s->next_picture_ptr->f.data[0]    : NULL,
             s->current_picture_ptr ? s->current_picture_ptr->f.data[0] : NULL,

             s->pict_type, s->droppable);

     if (s->codec_id != AV_CODEC_ID_H264) {

         if ((s->last_picture_ptr == NULL ||
              s->last_picture_ptr->f.data[0] == NULL) &&
             (s->pict_type != AV_PICTURE_TYPE_I ||
              s->picture_structure != PICT_FRAME)) {

             if (s->pict_type != AV_PICTURE_TYPE_I)

                 av_log(avctx, AV_LOG_ERROR,
                        "warning: first frame is no keyframe\n");

             else if (s->picture_structure != PICT_FRAME)

                 av_log(avctx, AV_LOG_INFO,
                        "allocate dummy last picture for field based first keyframe\n");

             /* Allocate a dummy frame */

             i = ff_find_unused_picture(s, 0);

             if (i < 0) {
                 av_log(s->avctx, AV_LOG_ERROR, "no frame buffer available\n");

                 return i;

             }

             s->last_picture_ptr = &s->picture[i];

             s->last_picture_ptr->f.key_frame = 0;

             s->last_picture_ptr->f.reference   = 3;

             s->last_picture_ptr->f.pict_type = AV_PICTURE_TYPE_P;

             if (ff_alloc_picture(s, s->last_picture_ptr, 0) < 0) {
                 s->last_picture_ptr = NULL;

                 return -1;

             }

             if(s->codec_id == AV_CODEC_ID_FLV1 || s->codec_id == AV_CODEC_ID_H263){

                 for(i=0; i<avctx->height; i++)
                     memset(s->last_picture_ptr->f.data[0] + s->last_picture_ptr->f.linesize[0]*i, 16, avctx->width);

             }
 

             ff_thread_report_progress(&s->last_picture_ptr->f, INT_MAX, 0);
             ff_thread_report_progress(&s->last_picture_ptr->f, INT_MAX, 1);

             s->last_picture_ptr->f.reference = 3;

         }

         if ((s->next_picture_ptr == NULL ||
              s->next_picture_ptr->f.data[0] == NULL) &&
             s->pict_type == AV_PICTURE_TYPE_B) {

             /* Allocate a dummy frame */

             i = ff_find_unused_picture(s, 0);

             if (i < 0) {
                 av_log(s->avctx, AV_LOG_ERROR, "no frame buffer available\n");

                 return i;

             }

             s->next_picture_ptr = &s->picture[i];

             s->next_picture_ptr->f.key_frame = 0;

             s->next_picture_ptr->f.reference   = 3;

             s->next_picture_ptr->f.pict_type = AV_PICTURE_TYPE_P;

             if (ff_alloc_picture(s, s->next_picture_ptr, 0) < 0) {
                 s->next_picture_ptr = NULL;

                 return -1;

             }

             ff_thread_report_progress(&s->next_picture_ptr->f, INT_MAX, 0);
             ff_thread_report_progress(&s->next_picture_ptr->f, INT_MAX, 1);

             s->next_picture_ptr->f.reference = 3;

         }
     }
 

     if (s->last_picture_ptr)
         ff_copy_picture(&s->last_picture, s->last_picture_ptr);
     if (s->next_picture_ptr)
         ff_copy_picture(&s->next_picture, s->next_picture_ptr);

     if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME)) {

         if (s->next_picture_ptr)
             s->next_picture_ptr->owner2 = s;
         if (s->last_picture_ptr)
             s->last_picture_ptr->owner2 = s;
     }
 

     assert(s->pict_type == AV_PICTURE_TYPE_I || (s->last_picture_ptr &&
                                                  s->last_picture_ptr->f.data[0]));

     if (s->picture_structure!= PICT_FRAME && s->out_format != FMT_H264) {

         int i;

         for (i = 0; i < 4; i++) {
             if (s->picture_structure == PICT_BOTTOM_FIELD) {
                 s->current_picture.f.data[i] +=
                     s->current_picture.f.linesize[i];

             }

             s->current_picture.f.linesize[i] *= 2;
             s->last_picture.f.linesize[i]    *= 2;
             s->next_picture.f.linesize[i]    *= 2;

         }
     }

     s->err_recognition = avctx->err_recognition;

     /* set dequantizer, we can't do it during init as
      * it might change for mpeg4 and we can't do it in the header
      * decode as init is not called for mpeg4 there yet */

     if (s->mpeg_quant || s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {

         s->dct_unquantize_intra = s->dct_unquantize_mpeg2_intra;
         s->dct_unquantize_inter = s->dct_unquantize_mpeg2_inter;

     } else if (s->out_format == FMT_H263 || s->out_format == FMT_H261) {

         s->dct_unquantize_intra = s->dct_unquantize_h263_intra;
         s->dct_unquantize_inter = s->dct_unquantize_h263_inter;

     } else {

         s->dct_unquantize_intra = s->dct_unquantize_mpeg1_intra;
         s->dct_unquantize_inter = s->dct_unquantize_mpeg1_inter;
     }

     if (s->dct_error_sum) {

         assert(s->avctx->noise_reduction && s->encoding);
         update_noise_reduction(s);
     }

     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)

         return ff_xvmc_field_start(s, avctx);

     return 0;

 }

 /* generic function for encode/decode called after a
  * frame has been coded/decoded. */

 void ff_MPV_frame_end(MpegEncContext *s)

 {

     int i;

     /* redraw edges for the frame if decoding didn't complete */

     // just to make sure that all data is rendered.
     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration) {

         ff_xvmc_field_end(s);

    } else if((s->error_count || s->encoding || !(s->avctx->codec->capabilities&CODEC_CAP_DRAW_HORIZ_BAND)) &&

               !s->avctx->hwaccel &&
               !(s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU) &&
               s->unrestricted_mv &&
               s->current_picture.f.reference &&
               !s->intra_only &&

               !(s->flags & CODEC_FLAG_EMU_EDGE) &&
               !s->avctx->lowres
             ) {

         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->avctx->pix_fmt);
         int hshift = desc->log2_chroma_w;
         int vshift = desc->log2_chroma_h;

         s->dsp.draw_edges(s->current_picture.f.data[0], s->current_picture.f.linesize[0],

                           s->h_edge_pos, s->v_edge_pos,
                           EDGE_WIDTH, EDGE_WIDTH,
                           EDGE_TOP | EDGE_BOTTOM);

         s->dsp.draw_edges(s->current_picture.f.data[1], s->current_picture.f.linesize[1],

                           s->h_edge_pos >> hshift, s->v_edge_pos >> vshift,
                           EDGE_WIDTH >> hshift, EDGE_WIDTH >> vshift,
                           EDGE_TOP | EDGE_BOTTOM);

         s->dsp.draw_edges(s->current_picture.f.data[2], s->current_picture.f.linesize[2],

                           s->h_edge_pos >> hshift, s->v_edge_pos >> vshift,
                           EDGE_WIDTH >> hshift, EDGE_WIDTH >> vshift,
                           EDGE_TOP | EDGE_BOTTOM);

     }

     emms_c();

     s->last_pict_type                 = s->pict_type;
     s->last_lambda_for [s->pict_type] = s->current_picture_ptr->f.quality;
     if (s->pict_type!= AV_PICTURE_TYPE_B) {
         s->last_non_b_pict_type = s->pict_type;

     }

 #if 0

     /* copy back current_picture variables */
     for (i = 0; i < MAX_PICTURE_COUNT; i++) {
         if (s->picture[i].f.data[0] == s->current_picture.f.data[0]) {
             s->picture[i] = s->current_picture;

             break;

         }

     }

     assert(i < MAX_PICTURE_COUNT);

 #endif

     if (s->encoding) {

         /* release non-reference frames */

         for (i = 0; i < s->picture_count; i++) {
             if (s->picture[i].f.data[0] && !s->picture[i].f.reference
                 /* && s->picture[i].type != FF_BUFFER_TYPE_SHARED */) {

                 free_frame_buffer(s, &s->picture[i]);

             }
         }

     }

     // clear copies, to avoid confusion
 #if 0

     memset(&s->last_picture,    0, sizeof(Picture));
     memset(&s->next_picture,    0, sizeof(Picture));

     memset(&s->current_picture, 0, sizeof(Picture));
 #endif

     s->avctx->coded_frame = &s->current_picture_ptr->f;

     if (s->codec_id != AV_CODEC_ID_H264 && s->current_picture.f.reference) {

         ff_thread_report_progress(&s->current_picture_ptr->f, INT_MAX, 0);

     }

 }
 

 /**

  * Draw a line from (ex, ey) -> (sx, sy).

  * @param w width of the image
  * @param h height of the image
  * @param stride stride/linesize of the image
  * @param color color of the arrow
  */

 static void draw_line(uint8_t *buf, int sx, int sy, int ex, int ey,
                       int w, int h, int stride, int color)
 {

     int x, y, fr, f;

     sx = av_clip(sx, 0, w - 1);
     sy = av_clip(sy, 0, h - 1);
     ex = av_clip(ex, 0, w - 1);
     ey = av_clip(ey, 0, h - 1);

     buf[sy * stride + sx] += color;

     if (FFABS(ex - sx) > FFABS(ey - sy)) {
         if (sx > ex) {

             FFSWAP(int, sx, ex);
             FFSWAP(int, sy, ey);

         }

         buf += sx + sy * stride;
         ex  -= sx;
         f    = ((ey - sy) << 16) / ex;

         for (x = 0; x <= ex; x++) {

             y  = (x * f) >> 16;
             fr = (x * f) & 0xFFFF;
             buf[y * stride + x]       += (color * (0x10000 - fr)) >> 16;

             if(fr) buf[(y + 1) * stride + x] += (color *            fr ) >> 16;

         }

     } else {
         if (sy > ey) {

             FFSWAP(int, sx, ex);
             FFSWAP(int, sy, ey);

         }

         buf += sx + sy * stride;
         ey  -= sy;
         if (ey)

             f = ((ex - sx) << 16) / ey;

         else
             f = 0;

         for(y= 0; y <= ey; y++){

             x  = (y*f) >> 16;
             fr = (y*f) & 0xFFFF;

             buf[y * stride + x]     += (color * (0x10000 - fr)) >> 16;

             if(fr) buf[y * stride + x + 1] += (color *            fr ) >> 16;

         }
     }
 }
 
 /**

  * Draw an arrow from (ex, ey) -> (sx, sy).

  * @param w width of the image
  * @param h height of the image
  * @param stride stride/linesize of the image
  * @param color color of the arrow
  */

 static void draw_arrow(uint8_t *buf, int sx, int sy, int ex,
                        int ey, int w, int h, int stride, int color)
 {

     int dx,dy;
 

     sx = av_clip(sx, -100, w + 100);
     sy = av_clip(sy, -100, h + 100);
     ex = av_clip(ex, -100, w + 100);
     ey = av_clip(ey, -100, h + 100);

     dx = ex - sx;
     dy = ey - sy;

     if (dx * dx + dy * dy > 3 * 3) {
         int rx =  dx + dy;
         int ry = -dx + dy;
         int length = ff_sqrt((rx * rx + ry * ry) << 8);

         // FIXME subpixel accuracy
         rx = ROUNDED_DIV(rx * 3 << 4, length);
         ry = ROUNDED_DIV(ry * 3 << 4, length);

         draw_line(buf, sx, sy, sx + rx, sy + ry, w, h, stride, color);
         draw_line(buf, sx, sy, sx - ry, sy + rx, w, h, stride, color);
     }
     draw_line(buf, sx, sy, ex, ey, w, h, stride, color);
 }
 
 /**

  * Print debugging info for the given picture.

  */

 void ff_print_debug_info(MpegEncContext *s, AVFrame *pict)
 {

     if (   s->avctx->hwaccel || !pict || !pict->mb_type
         || (s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU))

         return;

     if (s->avctx->debug & (FF_DEBUG_SKIP | FF_DEBUG_QP | FF_DEBUG_MB_TYPE)) {

         int x,y;

         av_log(s->avctx, AV_LOG_DEBUG, "New frame, type: %c\n",
                av_get_picture_type_char(pict->pict_type));

         for (y = 0; y < s->mb_height; y++) {
             for (x = 0; x < s->mb_width; x++) {
                 if (s->avctx->debug & FF_DEBUG_SKIP) {
                     int count = s->mbskip_table[x + y * s->mb_stride];
                     if (count > 9)
                         count = 9;

                     av_log(s->avctx, AV_LOG_DEBUG, "%1d", count);

                 }

                 if (s->avctx->debug & FF_DEBUG_QP) {
                     av_log(s->avctx, AV_LOG_DEBUG, "%2d",
                            pict->qscale_table[x + y * s->mb_stride]);

                 }

                 if (s->avctx->debug & FF_DEBUG_MB_TYPE) {
                     int mb_type = pict->mb_type[x + y * s->mb_stride];
                     // Type & MV direction
                     if (IS_PCM(mb_type))

                         av_log(s->avctx, AV_LOG_DEBUG, "P");

                     else if (IS_INTRA(mb_type) && IS_ACPRED(mb_type))

                         av_log(s->avctx, AV_LOG_DEBUG, "A");

                     else if (IS_INTRA4x4(mb_type))

                         av_log(s->avctx, AV_LOG_DEBUG, "i");

                     else if (IS_INTRA16x16(mb_type))

                         av_log(s->avctx, AV_LOG_DEBUG, "I");

                     else if (IS_DIRECT(mb_type) && IS_SKIP(mb_type))

                         av_log(s->avctx, AV_LOG_DEBUG, "d");

                     else if (IS_DIRECT(mb_type))

                         av_log(s->avctx, AV_LOG_DEBUG, "D");

                     else if (IS_GMC(mb_type) && IS_SKIP(mb_type))

                         av_log(s->avctx, AV_LOG_DEBUG, "g");

                     else if (IS_GMC(mb_type))

                         av_log(s->avctx, AV_LOG_DEBUG, "G");

                     else if (IS_SKIP(mb_type))

                         av_log(s->avctx, AV_LOG_DEBUG, "S");

                     else if (!USES_LIST(mb_type, 1))

                         av_log(s->avctx, AV_LOG_DEBUG, ">");

                     else if (!USES_LIST(mb_type, 0))

                         av_log(s->avctx, AV_LOG_DEBUG, "<");

                     else {

                         av_assert2(USES_LIST(mb_type, 0) && USES_LIST(mb_type, 1));

                         av_log(s->avctx, AV_LOG_DEBUG, "X");

                     }

                     // segmentation
                     if (IS_8X8(mb_type))

                         av_log(s->avctx, AV_LOG_DEBUG, "+");

                     else if (IS_16X8(mb_type))

                         av_log(s->avctx, AV_LOG_DEBUG, "-");

                     else if (IS_8X16(mb_type))

                         av_log(s->avctx, AV_LOG_DEBUG, "|");

                     else if (IS_INTRA(mb_type) || IS_16X16(mb_type))

                         av_log(s->avctx, AV_LOG_DEBUG, " ");

                     else

                         av_log(s->avctx, AV_LOG_DEBUG, "?");

                     if (IS_INTERLACED(mb_type))

                         av_log(s->avctx, AV_LOG_DEBUG, "=");

                     else

                         av_log(s->avctx, AV_LOG_DEBUG, " ");

                 }
             }

             av_log(s->avctx, AV_LOG_DEBUG, "\n");

         }
     }

     if ((s->avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) ||

         (s->avctx->debug_mv)) {
         const int shift = 1 + s->quarter_sample;

         int mb_y;

         uint8_t *ptr;
         int i;

         int h_chroma_shift, v_chroma_shift, block_height;

         const int width          = s->avctx->width;
         const int height         = s->avctx->height;
         const int mv_sample_log2 = 4 - pict->motion_subsample_log2;
         const int mv_stride      = (s->mb_width << mv_sample_log2) +

                                    (s->codec_id == AV_CODEC_ID_H264 ? 0 : 1);

         s->low_delay = 0; // needed to see the vectors without trashing the buffers
 

         avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &h_chroma_shift, &v_chroma_shift);
 

         for (i = 0; i < 3; i++) {

             size_t size= (i == 0) ? pict->linesize[i] * FFALIGN(height, 16):
                          pict->linesize[i] * FFALIGN(height, 16) >> v_chroma_shift;

             s->visualization_buffer[i]= av_realloc(s->visualization_buffer[i], size);
             memcpy(s->visualization_buffer[i], pict->data[i], size);

             pict->data[i] = s->visualization_buffer[i];

         }

         pict->type   = FF_BUFFER_TYPE_COPY;

         pict->opaque= NULL;

         ptr          = pict->data[0];
         block_height = 16 >> v_chroma_shift;

         for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

             int mb_x;

             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
                 const int mb_index = mb_x + mb_y * s->mb_stride;

                 if ((s->avctx->debug_mv) && pict->motion_val[0]) {

                     int type;
                     for (type = 0; type < 3; type++) {
                         int direction = 0;
                         switch (type) {
                         case 0:
                             if ((!(s->avctx->debug_mv & FF_DEBUG_VIS_MV_P_FOR)) ||
                                 (pict->pict_type!= AV_PICTURE_TYPE_P))

                                 continue;

                             direction = 0;
                             break;
                         case 1:
                             if ((!(s->avctx->debug_mv & FF_DEBUG_VIS_MV_B_FOR)) ||
                                 (pict->pict_type!= AV_PICTURE_TYPE_B))

                                 continue;

                             direction = 0;
                             break;
                         case 2:
                             if ((!(s->avctx->debug_mv & FF_DEBUG_VIS_MV_B_BACK)) ||
                                 (pict->pict_type!= AV_PICTURE_TYPE_B))

                                 continue;

                             direction = 1;
                             break;
                         }
                         if (!USES_LIST(pict->mb_type[mb_index], direction))
                             continue;
 
                         if (IS_8X8(pict->mb_type[mb_index])) {
                             int i;
                             for (i = 0; i < 4; i++) {
                                 int sx = mb_x * 16 + 4 + 8 * (i & 1);
                                 int sy = mb_y * 16 + 4 + 8 * (i >> 1);
                                 int xy = (mb_x * 2 + (i & 1) +
                                           (mb_y * 2 + (i >> 1)) * mv_stride) << (mv_sample_log2 - 1);
                                 int mx = (pict->motion_val[direction][xy][0] >> shift) + sx;
                                 int my = (pict->motion_val[direction][xy][1] >> shift) + sy;
                                 draw_arrow(ptr, sx, sy, mx, my, width,
                                            height, s->linesize, 100);
                             }
                         } else if (IS_16X8(pict->mb_type[mb_index])) {
                             int i;
                             for (i = 0; i < 2; i++) {
                                 int sx = mb_x * 16 + 8;
                                 int sy = mb_y * 16 + 4 + 8 * i;
                                 int xy = (mb_x * 2 + (mb_y * 2 + i) * mv_stride) << (mv_sample_log2 - 1);
                                 int mx = (pict->motion_val[direction][xy][0] >> shift);
                                 int my = (pict->motion_val[direction][xy][1] >> shift);
 
                                 if (IS_INTERLACED(pict->mb_type[mb_index]))
                                     my *= 2;
 
                             draw_arrow(ptr, sx, sy, mx + sx, my + sy, width,
                                        height, s->linesize, 100);
                             }
                         } else if (IS_8X16(pict->mb_type[mb_index])) {
                             int i;
                             for (i = 0; i < 2; i++) {
                                 int sx = mb_x * 16 + 4 + 8 * i;
                                 int sy = mb_y * 16 + 8;
                                 int xy = (mb_x * 2 + i + mb_y * 2 * mv_stride) << (mv_sample_log2 - 1);
                                 int mx = pict->motion_val[direction][xy][0] >> shift;
                                 int my = pict->motion_val[direction][xy][1] >> shift;
 
                                 if (IS_INTERLACED(pict->mb_type[mb_index]))
                                     my *= 2;
 
                                 draw_arrow(ptr, sx, sy, mx + sx, my + sy, width,
                                            height, s->linesize, 100);
                             }
                         } else {

                               int sx= mb_x * 16 + 8;
                               int sy= mb_y * 16 + 8;
                               int xy= (mb_x + mb_y * mv_stride) << mv_sample_log2;
                               int mx= (pict->motion_val[direction][xy][0]>>shift) + sx;
                               int my= (pict->motion_val[direction][xy][1]>>shift) + sy;

                               draw_arrow(ptr, sx, sy, mx, my, width, height, s->linesize, 100);
                         }

                     }

                 }

                 if ((s->avctx->debug & FF_DEBUG_VIS_QP)) {

                     uint64_t c = (pict->qscale_table[mb_index] * 128 / 31) *
                                  0x0101010101010101ULL;

                     int y;

                     for (y = 0; y < block_height; y++) {
                         *(uint64_t *)(pict->data[1] + 8 * mb_x +
                                       (block_height * mb_y + y) *
                                       pict->linesize[1]) = c;
                         *(uint64_t *)(pict->data[2] + 8 * mb_x +
                                       (block_height * mb_y + y) *
                                       pict->linesize[2]) = c;

                     }
                 }

                 if ((s->avctx->debug & FF_DEBUG_VIS_MB_TYPE) &&

                     pict->motion_val[0]) {

                     int mb_type = pict->mb_type[mb_index];

                     uint64_t u,v;
                     int y;

 #define COLOR(theta, r) \
     u = (int)(128 + r * cos(theta * 3.141592 / 180)); \
     v = (int)(128 + r * sin(theta * 3.141592 / 180));
 
 
                     u = v = 128;
                     if (IS_PCM(mb_type)) {
                         COLOR(120, 48)
                     } else if ((IS_INTRA(mb_type) && IS_ACPRED(mb_type)) ||
                                IS_INTRA16x16(mb_type)) {
                         COLOR(30, 48)
                     } else if (IS_INTRA4x4(mb_type)) {
                         COLOR(90, 48)
                     } else if (IS_DIRECT(mb_type) && IS_SKIP(mb_type)) {
                         // COLOR(120, 48)
                     } else if (IS_DIRECT(mb_type)) {
                         COLOR(150, 48)
                     } else if (IS_GMC(mb_type) && IS_SKIP(mb_type)) {
                         COLOR(170, 48)
                     } else if (IS_GMC(mb_type)) {
                         COLOR(190, 48)
                     } else if (IS_SKIP(mb_type)) {
                         // COLOR(180, 48)
                     } else if (!USES_LIST(mb_type, 1)) {
                         COLOR(240, 48)
                     } else if (!USES_LIST(mb_type, 0)) {
                         COLOR(0, 48)
                     } else {

                         av_assert2(USES_LIST(mb_type, 0) && USES_LIST(mb_type, 1));

                         COLOR(300,48)
                     }
 

                     u *= 0x0101010101010101ULL;
                     v *= 0x0101010101010101ULL;
                     for (y = 0; y < block_height; y++) {
                         *(uint64_t *)(pict->data[1] + 8 * mb_x +
                                       (block_height * mb_y + y) * pict->linesize[1]) = u;
                         *(uint64_t *)(pict->data[2] + 8 * mb_x +
                                       (block_height * mb_y + y) * pict->linesize[2]) = v;

                     }
 

                     // segmentation
                     if (IS_8X8(mb_type) || IS_16X8(mb_type)) {
                         *(uint64_t *)(pict->data[0] + 16 * mb_x + 0 +
                                       (16 * mb_y + 8) * pict->linesize[0]) ^= 0x8080808080808080ULL;
                         *(uint64_t *)(pict->data[0] + 16 * mb_x + 8 +
                                       (16 * mb_y + 8) * pict->linesize[0]) ^= 0x8080808080808080ULL;

                     }

                     if (IS_8X8(mb_type) || IS_8X16(mb_type)) {
                         for (y = 0; y < 16; y++)
                             pict->data[0][16 * mb_x + 8 + (16 * mb_y + y) *
                                           pict->linesize[0]] ^= 0x80;

                     }

                     if (IS_8X8(mb_type) && mv_sample_log2 >= 2) {
                         int dm = 1 << (mv_sample_log2 - 2);
                         for (i = 0; i < 4; i++) {
                             int sx = mb_x * 16 + 8 * (i & 1);
                             int sy = mb_y * 16 + 8 * (i >> 1);
                             int xy = (mb_x * 2 + (i & 1) +
                                      (mb_y * 2 + (i >> 1)) * mv_stride) << (mv_sample_log2 - 1);
                             // FIXME bidir
                             int32_t *mv = (int32_t *) &pict->motion_val[0][xy];
                             if (mv[0] != mv[dm] ||
                                 mv[dm * mv_stride] != mv[dm * (mv_stride + 1)])
                                 for (y = 0; y < 8; y++)
                                     pict->data[0][sx + 4 + (sy + y) * pict->linesize[0]] ^= 0x80;
                             if (mv[0] != mv[dm * mv_stride] || mv[dm] != mv[dm * (mv_stride + 1)])
                                 *(uint64_t *)(pict->data[0] + sx + (sy + 4) *
                                               pict->linesize[0]) ^= 0x8080808080808080ULL;

                         }
                     }

                     if (IS_INTERLACED(mb_type) &&

                         s->codec_id == AV_CODEC_ID_H264) {

                         // hmm
                     }

                 }

                 s->mbskip_table[mb_index] = 0;

             }
         }
     }

 }
 

 static inline int hpel_motion_lowres(MpegEncContext *s,
                                      uint8_t *dest, uint8_t *src,
                                      int field_based, int field_select,
                                      int src_x, int src_y,
                                      int width, int height, int stride,
                                      int h_edge_pos, int v_edge_pos,
                                      int w, int h, h264_chroma_mc_func *pix_op,
                                      int motion_x, int motion_y)
 {
     const int lowres   = s->avctx->lowres;
     const int op_index = FFMIN(lowres, 2);
     const int s_mask   = (2 << lowres) - 1;
     int emu = 0;
     int sx, sy;
 
     if (s->quarter_sample) {
         motion_x /= 2;
         motion_y /= 2;
     }
 
     sx = motion_x & s_mask;
     sy = motion_y & s_mask;
     src_x += motion_x >> lowres + 1;
     src_y += motion_y >> lowres + 1;
 
     src   += src_y * stride + src_x;
 
     if ((unsigned)src_x > FFMAX( h_edge_pos - (!!sx) - w,                 0) ||
         (unsigned)src_y > FFMAX((v_edge_pos >> field_based) - (!!sy) - h, 0)) {

         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, src, s->linesize, w + 1,

                                 (h + 1) << field_based, src_x,
                                 src_y   << field_based,
                                 h_edge_pos,
                                 v_edge_pos);
         src = s->edge_emu_buffer;
         emu = 1;
     }
 
     sx = (sx << 2) >> lowres;
     sy = (sy << 2) >> lowres;
     if (field_select)
         src += s->linesize;
     pix_op[op_index](dest, src, stride, h, sx, sy);
     return emu;
 }
 
 /* apply one mpeg motion vector to the three components */
 static av_always_inline void mpeg_motion_lowres(MpegEncContext *s,
                                                 uint8_t *dest_y,
                                                 uint8_t *dest_cb,
                                                 uint8_t *dest_cr,
                                                 int field_based,
                                                 int bottom_field,
                                                 int field_select,
                                                 uint8_t **ref_picture,
                                                 h264_chroma_mc_func *pix_op,
                                                 int motion_x, int motion_y,
                                                 int h, int mb_y)
 {
     uint8_t *ptr_y, *ptr_cb, *ptr_cr;
     int mx, my, src_x, src_y, uvsrc_x, uvsrc_y, uvlinesize, linesize, sx, sy,
         uvsx, uvsy;
     const int lowres     = s->avctx->lowres;
     const int op_index   = FFMIN(lowres-1+s->chroma_x_shift, 2);
     const int block_s    = 8>>lowres;
     const int s_mask     = (2 << lowres) - 1;
     const int h_edge_pos = s->h_edge_pos >> lowres;
     const int v_edge_pos = s->v_edge_pos >> lowres;
     linesize   = s->current_picture.f.linesize[0] << field_based;
     uvlinesize = s->current_picture.f.linesize[1] << field_based;
 
     // FIXME obviously not perfect but qpel will not work in lowres anyway
     if (s->quarter_sample) {
         motion_x /= 2;
         motion_y /= 2;
     }
 
     if(field_based){
         motion_y += (bottom_field - field_select)*((1 << lowres)-1);
     }
 
     sx = motion_x & s_mask;
     sy = motion_y & s_mask;
     src_x = s->mb_x * 2 * block_s + (motion_x >> lowres + 1);
     src_y = (mb_y * 2 * block_s >> field_based) + (motion_y >> lowres + 1);
 
     if (s->out_format == FMT_H263) {
         uvsx    = ((motion_x >> 1) & s_mask) | (sx & 1);
         uvsy    = ((motion_y >> 1) & s_mask) | (sy & 1);
         uvsrc_x = src_x >> 1;
         uvsrc_y = src_y >> 1;
     } else if (s->out_format == FMT_H261) {
         // even chroma mv's are full pel in H261
         mx      = motion_x / 4;
         my      = motion_y / 4;
         uvsx    = (2 * mx) & s_mask;
         uvsy    = (2 * my) & s_mask;
         uvsrc_x = s->mb_x * block_s + (mx >> lowres);
         uvsrc_y =    mb_y * block_s + (my >> lowres);
     } else {
         if(s->chroma_y_shift){
             mx      = motion_x / 2;
             my      = motion_y / 2;
             uvsx    = mx & s_mask;
             uvsy    = my & s_mask;
             uvsrc_x = s->mb_x * block_s                 + (mx >> lowres + 1);
             uvsrc_y =   (mb_y * block_s >> field_based) + (my >> lowres + 1);
         } else {
             if(s->chroma_x_shift){
             //Chroma422
                 mx = motion_x / 2;
                 uvsx = mx & s_mask;
                 uvsy = motion_y & s_mask;
                 uvsrc_y = src_y;
                 uvsrc_x = s->mb_x*block_s               + (mx >> (lowres+1));
             } else {
             //Chroma444
                 uvsx = motion_x & s_mask;
                 uvsy = motion_y & s_mask;
                 uvsrc_x = src_x;
                 uvsrc_y = src_y;
             }
         }
     }
 
     ptr_y  = ref_picture[0] + src_y   * linesize   + src_x;
     ptr_cb = ref_picture[1] + uvsrc_y * uvlinesize + uvsrc_x;
     ptr_cr = ref_picture[2] + uvsrc_y * uvlinesize + uvsrc_x;
 

     if ((unsigned) src_x > FFMAX( h_edge_pos - (!!sx) - 2 * block_s,       0) || uvsrc_y<0 ||

         (unsigned) src_y > FFMAX((v_edge_pos >> field_based) - (!!sy) - h, 0)) {

         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr_y,

                                 linesize >> field_based, 17, 17 + field_based,

                                 src_x, src_y << field_based, h_edge_pos,
                                 v_edge_pos);
         ptr_y = s->edge_emu_buffer;
         if (!CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY)) {
             uint8_t *uvbuf = s->edge_emu_buffer + 18 * s->linesize;

             s->vdsp.emulated_edge_mc(uvbuf , ptr_cb, uvlinesize >> field_based, 9,

                                     9 + field_based,
                                     uvsrc_x, uvsrc_y << field_based,
                                     h_edge_pos >> 1, v_edge_pos >> 1);

             s->vdsp.emulated_edge_mc(uvbuf + 16, ptr_cr, uvlinesize >> field_based, 9,

                                     9 + field_based,
                                     uvsrc_x, uvsrc_y << field_based,
                                     h_edge_pos >> 1, v_edge_pos >> 1);
             ptr_cb = uvbuf;
             ptr_cr = uvbuf + 16;
         }
     }
 
     // FIXME use this for field pix too instead of the obnoxious hack which changes picture.f.data
     if (bottom_field) {
         dest_y  += s->linesize;
         dest_cb += s->uvlinesize;
         dest_cr += s->uvlinesize;
     }
 
     if (field_select) {
         ptr_y   += s->linesize;
         ptr_cb  += s->uvlinesize;
         ptr_cr  += s->uvlinesize;
     }
 
     sx = (sx << 2) >> lowres;
     sy = (sy << 2) >> lowres;
     pix_op[lowres - 1](dest_y, ptr_y, linesize, h, sx, sy);
 
     if (!CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY)) {

         int hc = s->chroma_y_shift ? (h+1-bottom_field)>>1 : h;

         uvsx = (uvsx << 2) >> lowres;
         uvsy = (uvsy << 2) >> lowres;

         if (hc) {
             pix_op[op_index](dest_cb, ptr_cb, uvlinesize, hc, uvsx, uvsy);
             pix_op[op_index](dest_cr, ptr_cr, uvlinesize, hc, uvsx, uvsy);

         }
     }
     // FIXME h261 lowres loop filter
 }
 
 static inline void chroma_4mv_motion_lowres(MpegEncContext *s,
                                             uint8_t *dest_cb, uint8_t *dest_cr,
                                             uint8_t **ref_picture,
                                             h264_chroma_mc_func * pix_op,
                                             int mx, int my)
 {
     const int lowres     = s->avctx->lowres;
     const int op_index   = FFMIN(lowres, 2);
     const int block_s    = 8 >> lowres;
     const int s_mask     = (2 << lowres) - 1;
     const int h_edge_pos = s->h_edge_pos >> lowres + 1;
     const int v_edge_pos = s->v_edge_pos >> lowres + 1;
     int emu = 0, src_x, src_y, offset, sx, sy;
     uint8_t *ptr;
 
     if (s->quarter_sample) {
         mx /= 2;
         my /= 2;
     }
 
     /* In case of 8X8, we construct a single chroma motion vector
        with a special rounding */
     mx = ff_h263_round_chroma(mx);
     my = ff_h263_round_chroma(my);
 
     sx = mx & s_mask;
     sy = my & s_mask;
     src_x = s->mb_x * block_s + (mx >> lowres + 1);
     src_y = s->mb_y * block_s + (my >> lowres + 1);
 
     offset = src_y * s->uvlinesize + src_x;
     ptr = ref_picture[1] + offset;
     if (s->flags & CODEC_FLAG_EMU_EDGE) {
         if ((unsigned) src_x > FFMAX(h_edge_pos - (!!sx) - block_s, 0) ||
             (unsigned) src_y > FFMAX(v_edge_pos - (!!sy) - block_s, 0)) {

             s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr, s->uvlinesize,

                                     9, 9, src_x, src_y, h_edge_pos, v_edge_pos);
             ptr = s->edge_emu_buffer;
             emu = 1;
         }
     }
     sx = (sx << 2) >> lowres;
     sy = (sy << 2) >> lowres;
     pix_op[op_index](dest_cb, ptr, s->uvlinesize, block_s, sx, sy);
 
     ptr = ref_picture[2] + offset;
     if (emu) {

         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr, s->uvlinesize, 9, 9,

                                 src_x, src_y, h_edge_pos, v_edge_pos);
         ptr = s->edge_emu_buffer;
     }
     pix_op[op_index](dest_cr, ptr, s->uvlinesize, block_s, sx, sy);
 }
 
 /**
  * motion compensation of a single macroblock
  * @param s context
  * @param dest_y luma destination pointer
  * @param dest_cb chroma cb/u destination pointer
  * @param dest_cr chroma cr/v destination pointer
  * @param dir direction (0->forward, 1->backward)
  * @param ref_picture array[3] of pointers to the 3 planes of the reference picture
  * @param pix_op halfpel motion compensation function (average or put normally)
  * the motion vectors are taken from s->mv and the MV type from s->mv_type
  */
 static inline void MPV_motion_lowres(MpegEncContext *s,
                                      uint8_t *dest_y, uint8_t *dest_cb,
                                      uint8_t *dest_cr,
                                      int dir, uint8_t **ref_picture,
                                      h264_chroma_mc_func *pix_op)
 {
     int mx, my;
     int mb_x, mb_y, i;
     const int lowres  = s->avctx->lowres;
     const int block_s = 8 >>lowres;
 
     mb_x = s->mb_x;
     mb_y = s->mb_y;
 
     switch (s->mv_type) {
     case MV_TYPE_16X16:
         mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
                            0, 0, 0,
                            ref_picture, pix_op,
                            s->mv[dir][0][0], s->mv[dir][0][1],
                            2 * block_s, mb_y);
         break;
     case MV_TYPE_8X8:
         mx = 0;
         my = 0;
         for (i = 0; i < 4; i++) {
             hpel_motion_lowres(s, dest_y + ((i & 1) + (i >> 1) *
                                s->linesize) * block_s,
                                ref_picture[0], 0, 0,
                                (2 * mb_x + (i & 1)) * block_s,
                                (2 * mb_y + (i >> 1)) * block_s,
                                s->width, s->height, s->linesize,
                                s->h_edge_pos >> lowres, s->v_edge_pos >> lowres,
                                block_s, block_s, pix_op,
                                s->mv[dir][i][0], s->mv[dir][i][1]);
 
             mx += s->mv[dir][i][0];
             my += s->mv[dir][i][1];
         }
 
         if (!CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY))
             chroma_4mv_motion_lowres(s, dest_cb, dest_cr, ref_picture,
                                      pix_op, mx, my);
         break;
     case MV_TYPE_FIELD:
         if (s->picture_structure == PICT_FRAME) {
             /* top field */
             mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
                                1, 0, s->field_select[dir][0],
                                ref_picture, pix_op,
                                s->mv[dir][0][0], s->mv[dir][0][1],
                                block_s, mb_y);
             /* bottom field */
             mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
                                1, 1, s->field_select[dir][1],
                                ref_picture, pix_op,
                                s->mv[dir][1][0], s->mv[dir][1][1],
                                block_s, mb_y);
         } else {
             if (s->picture_structure != s->field_select[dir][0] + 1 &&
                 s->pict_type != AV_PICTURE_TYPE_B && !s->first_field) {
                 ref_picture = s->current_picture_ptr->f.data;
 
             }
             mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
                                0, 0, s->field_select[dir][0],
                                ref_picture, pix_op,
                                s->mv[dir][0][0],
                                s->mv[dir][0][1], 2 * block_s, mb_y >> 1);
             }
         break;
     case MV_TYPE_16X8:
         for (i = 0; i < 2; i++) {
             uint8_t **ref2picture;
 
             if (s->picture_structure == s->field_select[dir][i] + 1 ||
                 s->pict_type == AV_PICTURE_TYPE_B || s->first_field) {
                 ref2picture = ref_picture;
             } else {
                 ref2picture = s->current_picture_ptr->f.data;
             }
 
             mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
                                0, 0, s->field_select[dir][i],
                                ref2picture, pix_op,
                                s->mv[dir][i][0], s->mv[dir][i][1] +
                                2 * block_s * i, block_s, mb_y >> 1);
 
             dest_y  +=  2 * block_s *  s->linesize;
             dest_cb += (2 * block_s >> s->chroma_y_shift) * s->uvlinesize;
             dest_cr += (2 * block_s >> s->chroma_y_shift) * s->uvlinesize;
         }
         break;
     case MV_TYPE_DMV:
         if (s->picture_structure == PICT_FRAME) {
             for (i = 0; i < 2; i++) {
                 int j;
                 for (j = 0; j < 2; j++) {
                     mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
                                        1, j, j ^ i,
                                        ref_picture, pix_op,
                                        s->mv[dir][2 * i + j][0],
                                        s->mv[dir][2 * i + j][1],
                                        block_s, mb_y);
                 }
                 pix_op = s->dsp.avg_h264_chroma_pixels_tab;
             }
         } else {
             for (i = 0; i < 2; i++) {
                 mpeg_motion_lowres(s, dest_y, dest_cb, dest_cr,
                                    0, 0, s->picture_structure != i + 1,
                                    ref_picture, pix_op,
                                    s->mv[dir][2 * i][0],s->mv[dir][2 * i][1],
                                    2 * block_s, mb_y >> 1);
 
                 // after put we make avg of the same block
                 pix_op = s->dsp.avg_h264_chroma_pixels_tab;
 
                 // opposite parity is always in the same
                 // frame if this is second field
                 if (!s->first_field) {
                     ref_picture = s->current_picture_ptr->f.data;
                 }
             }
         }
         break;
     default:

         av_assert2(0);

     }
 }
 

 /**
  * find the lowest MB row referenced in the MVs
  */

 int ff_MPV_lowest_referenced_row(MpegEncContext *s, int dir)

 {
     int my_max = INT_MIN, my_min = INT_MAX, qpel_shift = !s->quarter_sample;
     int my, off, i, mvs;
 

     if (s->picture_structure != PICT_FRAME || s->mcsel)
         goto unhandled;

 
     switch (s->mv_type) {
         case MV_TYPE_16X16:
             mvs = 1;
             break;
         case MV_TYPE_16X8:
             mvs = 2;
             break;
         case MV_TYPE_8X8:
             mvs = 4;
             break;
         default:
             goto unhandled;
     }
 
     for (i = 0; i < mvs; i++) {
         my = s->mv[dir][i][1]<<qpel_shift;
         my_max = FFMAX(my_max, my);
         my_min = FFMIN(my_min, my);
     }
 
     off = (FFMAX(-my_min, my_max) + 63) >> 6;
 
     return FFMIN(FFMAX(s->mb_y + off, 0), s->mb_height-1);
 unhandled:
     return s->mb_height-1;
 }
 

 /* put block[] to dest[] */

 static inline void put_dct(MpegEncContext *s,

                            DCTELEM *block, int i, uint8_t *dest, int line_size, int qscale)

 {

     s->dct_unquantize_intra(s, block, i, qscale);

     s->dsp.idct_put (dest, line_size, block);

 }
 
 /* add block[] to dest[] */

 static inline void add_dct(MpegEncContext *s,

                            DCTELEM *block, int i, uint8_t *dest, int line_size)

 {

     if (s->block_last_index[i] >= 0) {

         s->dsp.idct_add (dest, line_size, block);

     }
 }

 static inline void add_dequant_dct(MpegEncContext *s,

                            DCTELEM *block, int i, uint8_t *dest, int line_size, int qscale)

 {

     if (s->block_last_index[i] >= 0) {

         s->dct_unquantize_inter(s, block, i, qscale);

         s->dsp.idct_add (dest, line_size, block);

     }
 }
 

 /**

  * Clean dc, ac, coded_block for the current non-intra MB.

  */
 void ff_clean_intra_table_entries(MpegEncContext *s)
 {

     int wrap = s->b8_stride;

     int xy = s->block_index[0];

 
     s->dc_val[0][xy           ] =
     s->dc_val[0][xy + 1       ] =

     s->dc_val[0][xy     + wrap] =
     s->dc_val[0][xy + 1 + wrap] = 1024;
     /* ac pred */

     memset(s->ac_val[0][xy       ], 0, 32 * sizeof(int16_t));
     memset(s->ac_val[0][xy + wrap], 0, 32 * sizeof(int16_t));

     if (s->msmpeg4_version>=3) {
         s->coded_block[xy           ] =
         s->coded_block[xy + 1       ] =
         s->coded_block[xy     + wrap] =
         s->coded_block[xy + 1 + wrap] = 0;
     }
     /* chroma */

     wrap = s->mb_stride;
     xy = s->mb_x + s->mb_y * wrap;

     s->dc_val[1][xy] =
     s->dc_val[2][xy] = 1024;
     /* ac pred */

     memset(s->ac_val[1][xy], 0, 16 * sizeof(int16_t));
     memset(s->ac_val[2][xy], 0, 16 * sizeof(int16_t));

     s->mbintra_table[xy]= 0;

 }
 

 /* generic function called after a macroblock has been parsed by the
    decoder or after it has been encoded by the encoder.
 
    Important variables used:
    s->mb_intra : true if intra macroblock
    s->mv_dir   : motion vector direction
    s->mv_type  : motion vector type
    s->mv       : motion vector
    s->interlaced_dct : true if interlaced dct used (mpeg2)
  */

 static av_always_inline
 void MPV_decode_mb_internal(MpegEncContext *s, DCTELEM block[12][64],

                             int lowres_flag, int is_mpeg12)

 {

     const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;

     if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration){

         ff_xvmc_decode_mb(s);//xvmc uses pblocks

         return;
     }

     if(s->avctx->debug&FF_DEBUG_DCT_COEFF) {
        /* save DCT coefficients */
        int i,j;

        DCTELEM *dct = &s->current_picture.f.dct_coeff[mb_xy * 64 * 6];

        av_log(s->avctx, AV_LOG_DEBUG, "DCT coeffs of MB at %dx%d:\n", s->mb_x, s->mb_y);
        for(i=0; i<6; i++){
            for(j=0; j<64; j++){

                *dct++ = block[i][s->dsp.idct_permutation[j]];

                av_log(s->avctx, AV_LOG_DEBUG, "%5d", dct[-1]);
            }
            av_log(s->avctx, AV_LOG_DEBUG, "\n");
        }

     }
 

     s->current_picture.f.qscale_table[mb_xy] = s->qscale;

     /* update DC predictors for P macroblocks */
     if (!s->mb_intra) {

         if (!is_mpeg12 && (s->h263_pred || s->h263_aic)) {

             if(s->mbintra_table[mb_xy])

                 ff_clean_intra_table_entries(s);

         } else {

             s->last_dc[0] =
             s->last_dc[1] =

             s->last_dc[2] = 128 << s->intra_dc_precision;
         }
     }

     else if (!is_mpeg12 && (s->h263_pred || s->h263_aic))

         s->mbintra_table[mb_xy]=1;

     if ((s->flags&CODEC_FLAG_PSNR) || !(s->encoding && (s->intra_only || s->pict_type==AV_PICTURE_TYPE_B) && s->avctx->mb_decision != FF_MB_DECISION_RD)) { //FIXME precalc

         uint8_t *dest_y, *dest_cb, *dest_cr;

         int dct_linesize, dct_offset;

         op_pixels_func (*op_pix)[4];
         qpel_mc_func (*op_qpix)[16];

         const int linesize   = s->current_picture.f.linesize[0]; //not s->linesize as this would be wrong for field pics
         const int uvlinesize = s->current_picture.f.linesize[1];

         const int readable= s->pict_type != AV_PICTURE_TYPE_B || s->encoding || s->avctx->draw_horiz_band || lowres_flag;
         const int block_size= lowres_flag ? 8>>s->avctx->lowres : 8;

         /* avoid copy if macroblock skipped in last frame too */
         /* skip only during decoding as we might trash the buffers during encoding a bit */
         if(!s->encoding){

             uint8_t *mbskip_ptr = &s->mbskip_table[mb_xy];

             if (s->mb_skipped) {
                 s->mb_skipped= 0;

                 av_assert2(s->pict_type!=AV_PICTURE_TYPE_I);

                 *mbskip_ptr = 1;

             } else if(!s->current_picture.f.reference) {

                 *mbskip_ptr = 1;

             } else{

                 *mbskip_ptr = 0; /* not skipped */
             }

         }

         dct_linesize = linesize << s->interlaced_dct;

         dct_offset   = s->interlaced_dct ? linesize : linesize * block_size;

         if(readable){
             dest_y=  s->dest[0];
             dest_cb= s->dest[1];
             dest_cr= s->dest[2];
         }else{

             dest_y = s->b_scratchpad;

             dest_cb= s->b_scratchpad+16*linesize;

             dest_cr= s->b_scratchpad+32*linesize;

         }

         if (!s->mb_intra) {
             /* motion handling */

             /* decoding or more than one mb_type (MC was already done otherwise) */

             if(!s->encoding){

                 if(HAVE_THREADS && s->avctx->active_thread_type&FF_THREAD_FRAME) {

                     if (s->mv_dir & MV_DIR_FORWARD) {

                         ff_thread_await_progress(&s->last_picture_ptr->f,
                                                  ff_MPV_lowest_referenced_row(s, 0),
                                                  0);

                     }
                     if (s->mv_dir & MV_DIR_BACKWARD) {

                         ff_thread_await_progress(&s->next_picture_ptr->f,
                                                  ff_MPV_lowest_referenced_row(s, 1),
                                                  0);

                     }
                 }
 

                 if(lowres_flag){
                     h264_chroma_mc_func *op_pix = s->dsp.put_h264_chroma_pixels_tab;
 
                     if (s->mv_dir & MV_DIR_FORWARD) {
                         MPV_motion_lowres(s, dest_y, dest_cb, dest_cr, 0, s->last_picture.f.data, op_pix);
                         op_pix = s->dsp.avg_h264_chroma_pixels_tab;
                     }
                     if (s->mv_dir & MV_DIR_BACKWARD) {
                         MPV_motion_lowres(s, dest_y, dest_cb, dest_cr, 1, s->next_picture.f.data, op_pix);
                     }

                 }else{

                     op_qpix= s->me.qpel_put;
                     if ((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
                         op_pix = s->dsp.put_pixels_tab;
                     }else{
                         op_pix = s->dsp.put_no_rnd_pixels_tab;
                     }
                     if (s->mv_dir & MV_DIR_FORWARD) {

                         ff_MPV_motion(s, dest_y, dest_cb, dest_cr, 0, s->last_picture.f.data, op_pix, op_qpix);

                         op_pix = s->dsp.avg_pixels_tab;
                         op_qpix= s->me.qpel_avg;
                     }
                     if (s->mv_dir & MV_DIR_BACKWARD) {

                         ff_MPV_motion(s, dest_y, dest_cb, dest_cr, 1, s->next_picture.f.data, op_pix, op_qpix);

                     }

                 }

             }
 

             /* skip dequant / idct if we are really late ;) */

             if(s->avctx->skip_idct){

                 if(  (s->avctx->skip_idct >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B)
                    ||(s->avctx->skip_idct >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I)

                    || s->avctx->skip_idct >= AVDISCARD_ALL)
                     goto skip_idct;
             }

             /* add dct residue */

             if(s->encoding || !(   s->msmpeg4_version || s->codec_id==AV_CODEC_ID_MPEG1VIDEO || s->codec_id==AV_CODEC_ID_MPEG2VIDEO
                                 || (s->codec_id==AV_CODEC_ID_MPEG4 && !s->mpeg_quant))){

                 add_dequant_dct(s, block[0], 0, dest_y                          , dct_linesize, s->qscale);

                 add_dequant_dct(s, block[1], 1, dest_y              + block_size, dct_linesize, s->qscale);

                 add_dequant_dct(s, block[2], 2, dest_y + dct_offset             , dct_linesize, s->qscale);

                 add_dequant_dct(s, block[3], 3, dest_y + dct_offset + block_size, dct_linesize, s->qscale);

                 if(!CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){

                     if (s->chroma_y_shift){
                         add_dequant_dct(s, block[4], 4, dest_cb, uvlinesize, s->chroma_qscale);
                         add_dequant_dct(s, block[5], 5, dest_cr, uvlinesize, s->chroma_qscale);
                     }else{
                         dct_linesize >>= 1;
                         dct_offset >>=1;
                         add_dequant_dct(s, block[4], 4, dest_cb,              dct_linesize, s->chroma_qscale);
                         add_dequant_dct(s, block[5], 5, dest_cr,              dct_linesize, s->chroma_qscale);
                         add_dequant_dct(s, block[6], 6, dest_cb + dct_offset, dct_linesize, s->chroma_qscale);
                         add_dequant_dct(s, block[7], 7, dest_cr + dct_offset, dct_linesize, s->chroma_qscale);
                     }

                 }

             } else if(is_mpeg12 || (s->codec_id != AV_CODEC_ID_WMV2)){

                 add_dct(s, block[0], 0, dest_y                          , dct_linesize);

                 add_dct(s, block[1], 1, dest_y              + block_size, dct_linesize);

                 add_dct(s, block[2], 2, dest_y + dct_offset             , dct_linesize);

                 add_dct(s, block[3], 3, dest_y + dct_offset + block_size, dct_linesize);

                 if(!CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){

                     if(s->chroma_y_shift){//Chroma420
                         add_dct(s, block[4], 4, dest_cb, uvlinesize);
                         add_dct(s, block[5], 5, dest_cr, uvlinesize);
                     }else{
                         //chroma422
                         dct_linesize = uvlinesize << s->interlaced_dct;

                         dct_offset   = s->interlaced_dct ? uvlinesize : uvlinesize*block_size;

 
                         add_dct(s, block[4], 4, dest_cb, dct_linesize);
                         add_dct(s, block[5], 5, dest_cr, dct_linesize);
                         add_dct(s, block[6], 6, dest_cb+dct_offset, dct_linesize);
                         add_dct(s, block[7], 7, dest_cr+dct_offset, dct_linesize);
                         if(!s->chroma_x_shift){//Chroma444

                             add_dct(s, block[8], 8, dest_cb+block_size, dct_linesize);
                             add_dct(s, block[9], 9, dest_cr+block_size, dct_linesize);
                             add_dct(s, block[10], 10, dest_cb+block_size+dct_offset, dct_linesize);
                             add_dct(s, block[11], 11, dest_cr+block_size+dct_offset, dct_linesize);

                         }
                     }
                 }//fi gray
             }

             else if (CONFIG_WMV2_DECODER || CONFIG_WMV2_ENCODER) {

                 ff_wmv2_add_mb(s, block, dest_y, dest_cb, dest_cr);

             }

         } else {
             /* dct only in intra block */

             if(s->encoding || !(s->codec_id==AV_CODEC_ID_MPEG1VIDEO || s->codec_id==AV_CODEC_ID_MPEG2VIDEO)){

                 put_dct(s, block[0], 0, dest_y                          , dct_linesize, s->qscale);
                 put_dct(s, block[1], 1, dest_y              + block_size, dct_linesize, s->qscale);
                 put_dct(s, block[2], 2, dest_y + dct_offset             , dct_linesize, s->qscale);
                 put_dct(s, block[3], 3, dest_y + dct_offset + block_size, dct_linesize, s->qscale);

                 if(!CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){

                     if(s->chroma_y_shift){
                         put_dct(s, block[4], 4, dest_cb, uvlinesize, s->chroma_qscale);
                         put_dct(s, block[5], 5, dest_cr, uvlinesize, s->chroma_qscale);
                     }else{
                         dct_offset >>=1;
                         dct_linesize >>=1;
                         put_dct(s, block[4], 4, dest_cb,              dct_linesize, s->chroma_qscale);
                         put_dct(s, block[5], 5, dest_cr,              dct_linesize, s->chroma_qscale);
                         put_dct(s, block[6], 6, dest_cb + dct_offset, dct_linesize, s->chroma_qscale);
                         put_dct(s, block[7], 7, dest_cr + dct_offset, dct_linesize, s->chroma_qscale);
                     }

                 }
             }else{

                 s->dsp.idct_put(dest_y                          , dct_linesize, block[0]);

                 s->dsp.idct_put(dest_y              + block_size, dct_linesize, block[1]);

                 s->dsp.idct_put(dest_y + dct_offset             , dct_linesize, block[2]);

                 s->dsp.idct_put(dest_y + dct_offset + block_size, dct_linesize, block[3]);

                 if(!CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){

                     if(s->chroma_y_shift){
                         s->dsp.idct_put(dest_cb, uvlinesize, block[4]);
                         s->dsp.idct_put(dest_cr, uvlinesize, block[5]);
                     }else{
 
                         dct_linesize = uvlinesize << s->interlaced_dct;

                         dct_offset   = s->interlaced_dct? uvlinesize : uvlinesize*block_size;

 
                         s->dsp.idct_put(dest_cb,              dct_linesize, block[4]);
                         s->dsp.idct_put(dest_cr,              dct_linesize, block[5]);
                         s->dsp.idct_put(dest_cb + dct_offset, dct_linesize, block[6]);
                         s->dsp.idct_put(dest_cr + dct_offset, dct_linesize, block[7]);
                         if(!s->chroma_x_shift){//Chroma444

                             s->dsp.idct_put(dest_cb + block_size,              dct_linesize, block[8]);
                             s->dsp.idct_put(dest_cr + block_size,              dct_linesize, block[9]);
                             s->dsp.idct_put(dest_cb + block_size + dct_offset, dct_linesize, block[10]);
                             s->dsp.idct_put(dest_cr + block_size + dct_offset, dct_linesize, block[11]);

                         }
                     }
                 }//gray

             }

         }

 skip_idct:

         if(!readable){
             s->dsp.put_pixels_tab[0][0](s->dest[0], dest_y ,   linesize,16);

             s->dsp.put_pixels_tab[s->chroma_x_shift][0](s->dest[1], dest_cb, uvlinesize,16 >> s->chroma_y_shift);
             s->dsp.put_pixels_tab[s->chroma_x_shift][0](s->dest[2], dest_cr, uvlinesize,16 >> s->chroma_y_shift);

         }

     }
 }
 

 void ff_MPV_decode_mb(MpegEncContext *s, DCTELEM block[12][64]){

 #if !CONFIG_SMALL

     if(s->out_format == FMT_MPEG1) {

         if(s->avctx->lowres) MPV_decode_mb_internal(s, block, 1, 1);
         else                 MPV_decode_mb_internal(s, block, 0, 1);

     } else
 #endif

     if(s->avctx->lowres) MPV_decode_mb_internal(s, block, 1, 0);
     else                  MPV_decode_mb_internal(s, block, 0, 0);

 }
 

 /**
  * @param h is the normal height, this will be reduced automatically if needed for the last row
  */
 void ff_draw_horiz_band(MpegEncContext *s, int y, int h){

     const int field_pic= s->picture_structure != PICT_FRAME;

     if(field_pic){
         h <<= 1;
         y <<= 1;
     }
 
     if (!s->avctx->hwaccel
        && !(s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
        && s->unrestricted_mv

        && s->current_picture.f.reference

        && !s->intra_only
        && !(s->flags&CODEC_FLAG_EMU_EDGE)) {

         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->avctx->pix_fmt);

         int sides = 0, edge_h;

         int hshift = desc->log2_chroma_w;
         int vshift = desc->log2_chroma_h;

         if (y==0) sides |= EDGE_TOP;
         if (y + h >= s->v_edge_pos) sides |= EDGE_BOTTOM;
 
         edge_h= FFMIN(h, s->v_edge_pos - y);
 

         s->dsp.draw_edges(s->current_picture_ptr->f.data[0] +  y         *s->linesize,
                           s->linesize,           s->h_edge_pos,         edge_h,
                           EDGE_WIDTH,            EDGE_WIDTH,            sides);
         s->dsp.draw_edges(s->current_picture_ptr->f.data[1] + (y>>vshift)*s->uvlinesize,
                           s->uvlinesize,         s->h_edge_pos>>hshift, edge_h>>vshift,
                           EDGE_WIDTH>>hshift,    EDGE_WIDTH>>vshift,    sides);
         s->dsp.draw_edges(s->current_picture_ptr->f.data[2] + (y>>vshift)*s->uvlinesize,
                           s->uvlinesize,         s->h_edge_pos>>hshift, edge_h>>vshift,
                           EDGE_WIDTH>>hshift,    EDGE_WIDTH>>vshift,    sides);

     }
 
     h= FFMIN(h, s->avctx->height - y);
 
     if(field_pic && s->first_field && !(s->avctx->slice_flags&SLICE_FLAG_ALLOW_FIELD)) return;
 

     if (s->avctx->draw_horiz_band) {

         AVFrame *src;

         int offset[AV_NUM_DATA_POINTERS];
         int i;

         if(s->pict_type==AV_PICTURE_TYPE_B || s->low_delay || (s->avctx->slice_flags&SLICE_FLAG_CODED_ORDER))

             src = &s->current_picture_ptr->f;

         else if(s->last_picture_ptr)

             src = &s->last_picture_ptr->f;

         else
             return;

         if(s->pict_type==AV_PICTURE_TYPE_B && s->picture_structure == PICT_FRAME && s->out_format != FMT_H264){

             for (i = 0; i < AV_NUM_DATA_POINTERS; i++)
                 offset[i] = 0;

         }else{

             offset[0]= y * s->linesize;

             offset[1]=

             offset[2]= (y >> s->chroma_y_shift) * s->uvlinesize;

             for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
                 offset[i] = 0;

         }

         emms_c();
 

         s->avctx->draw_horiz_band(s->avctx, src, offset,
                                   y, s->picture_structure, h);

     }
 }
 

 void ff_init_block_index(MpegEncContext *s){ //FIXME maybe rename

     const int linesize   = s->current_picture.f.linesize[0]; //not s->linesize as this would be wrong for field pics
     const int uvlinesize = s->current_picture.f.linesize[1];

     const int mb_size= 4 - s->avctx->lowres;

     s->block_index[0]= s->b8_stride*(s->mb_y*2    ) - 2 + s->mb_x*2;
     s->block_index[1]= s->b8_stride*(s->mb_y*2    ) - 1 + s->mb_x*2;
     s->block_index[2]= s->b8_stride*(s->mb_y*2 + 1) - 2 + s->mb_x*2;
     s->block_index[3]= s->b8_stride*(s->mb_y*2 + 1) - 1 + s->mb_x*2;
     s->block_index[4]= s->mb_stride*(s->mb_y + 1)                + s->b8_stride*s->mb_height*2 + s->mb_x - 1;
     s->block_index[5]= s->mb_stride*(s->mb_y + s->mb_height + 2) + s->b8_stride*s->mb_height*2 + s->mb_x - 1;

     //block_index is not used by mpeg2, so it is not affected by chroma_format
 

     s->dest[0] = s->current_picture.f.data[0] + ((s->mb_x - 1) <<  mb_size);
     s->dest[1] = s->current_picture.f.data[1] + ((s->mb_x - 1) << (mb_size - s->chroma_x_shift));
     s->dest[2] = s->current_picture.f.data[2] + ((s->mb_x - 1) << (mb_size - s->chroma_x_shift));

     if(!(s->pict_type==AV_PICTURE_TYPE_B && s->avctx->draw_horiz_band && s->picture_structure==PICT_FRAME))

     {

         if(s->picture_structure==PICT_FRAME){

         s->dest[0] += s->mb_y *   linesize << mb_size;
         s->dest[1] += s->mb_y * uvlinesize << (mb_size - s->chroma_y_shift);
         s->dest[2] += s->mb_y * uvlinesize << (mb_size - s->chroma_y_shift);

         }else{
             s->dest[0] += (s->mb_y>>1) *   linesize << mb_size;
             s->dest[1] += (s->mb_y>>1) * uvlinesize << (mb_size - s->chroma_y_shift);
             s->dest[2] += (s->mb_y>>1) * uvlinesize << (mb_size - s->chroma_y_shift);

             av_assert1((s->mb_y&1) == (s->picture_structure == PICT_BOTTOM_FIELD));

         }

     }

 }
 

 void ff_mpeg_flush(AVCodecContext *avctx){
     int i;
     MpegEncContext *s = avctx->priv_data;

 
     if(s==NULL || s->picture==NULL)

         return;

     for(i=0; i<s->picture_count; i++){

        if (s->picture[i].f.data[0] &&
            (s->picture[i].f.type == FF_BUFFER_TYPE_INTERNAL ||
             s->picture[i].f.type == FF_BUFFER_TYPE_USER))

         free_frame_buffer(s, &s->picture[i]);

     }

     s->current_picture_ptr = s->last_picture_ptr = s->next_picture_ptr = NULL;

     s->mb_x= s->mb_y= 0;

     s->closed_gop= 0;

     s->parse_context.state= -1;
     s->parse_context.frame_start_found= 0;
     s->parse_context.overread= 0;
     s->parse_context.overread_index= 0;
     s->parse_context.index= 0;
     s->parse_context.last_index= 0;

     s->bitstream_buffer_size=0;

     s->pp_time=0;

 }
 

 static void dct_unquantize_mpeg1_intra_c(MpegEncContext *s,

                                    DCTELEM *block, int n, int qscale)

 {

     int i, level, nCoeffs;

     const uint16_t *quant_matrix;

     nCoeffs= s->block_last_index[n];

     block[0] *= n < 4 ? s->y_dc_scale : s->c_dc_scale;

     /* XXX: only mpeg1 */
     quant_matrix = s->intra_matrix;
     for(i=1;i<=nCoeffs;i++) {
         int j= s->intra_scantable.permutated[i];
         level = block[j];
         if (level) {
             if (level < 0) {
                 level = -level;
                 level = (int)(level * qscale * quant_matrix[j]) >> 3;
                 level = (level - 1) | 1;
                 level = -level;
             } else {
                 level = (int)(level * qscale * quant_matrix[j]) >> 3;
                 level = (level - 1) | 1;

             }

             block[j] = level;

         }

     }
 }
 

 static void dct_unquantize_mpeg1_inter_c(MpegEncContext *s,

                                    DCTELEM *block, int n, int qscale)
 {
     int i, level, nCoeffs;
     const uint16_t *quant_matrix;
 
     nCoeffs= s->block_last_index[n];

     quant_matrix = s->inter_matrix;
     for(i=0; i<=nCoeffs; i++) {
         int j= s->intra_scantable.permutated[i];
         level = block[j];
         if (level) {
             if (level < 0) {
                 level = -level;
                 level = (((level << 1) + 1) * qscale *
                          ((int) (quant_matrix[j]))) >> 4;
                 level = (level - 1) | 1;
                 level = -level;
             } else {
                 level = (((level << 1) + 1) * qscale *
                          ((int) (quant_matrix[j]))) >> 4;
                 level = (level - 1) | 1;

             }

             block[j] = level;

         }
     }
 }

 static void dct_unquantize_mpeg2_intra_c(MpegEncContext *s,

                                    DCTELEM *block, int n, int qscale)
 {
     int i, level, nCoeffs;

     const uint16_t *quant_matrix;

     if(s->alternate_scan) nCoeffs= 63;
     else nCoeffs= s->block_last_index[n];

     block[0] *= n < 4 ? s->y_dc_scale : s->c_dc_scale;

     quant_matrix = s->intra_matrix;
     for(i=1;i<=nCoeffs;i++) {
         int j= s->intra_scantable.permutated[i];
         level = block[j];
         if (level) {
             if (level < 0) {
                 level = -level;
                 level = (int)(level * qscale * quant_matrix[j]) >> 3;
                 level = -level;
             } else {
                 level = (int)(level * qscale * quant_matrix[j]) >> 3;
             }
             block[j] = level;
         }
     }
 }
 

 static void dct_unquantize_mpeg2_intra_bitexact(MpegEncContext *s,
                                    DCTELEM *block, int n, int qscale)
 {
     int i, level, nCoeffs;
     const uint16_t *quant_matrix;
     int sum=-1;
 
     if(s->alternate_scan) nCoeffs= 63;
     else nCoeffs= s->block_last_index[n];
 

     block[0] *= n < 4 ? s->y_dc_scale : s->c_dc_scale;

     sum += block[0];

     quant_matrix = s->intra_matrix;
     for(i=1;i<=nCoeffs;i++) {
         int j= s->intra_scantable.permutated[i];
         level = block[j];
         if (level) {
             if (level < 0) {
                 level = -level;
                 level = (int)(level * qscale * quant_matrix[j]) >> 3;
                 level = -level;
             } else {
                 level = (int)(level * qscale * quant_matrix[j]) >> 3;
             }
             block[j] = level;
             sum+=level;
         }
     }
     block[63]^=sum&1;
 }
 

 static void dct_unquantize_mpeg2_inter_c(MpegEncContext *s,

                                    DCTELEM *block, int n, int qscale)
 {
     int i, level, nCoeffs;
     const uint16_t *quant_matrix;
     int sum=-1;
 
     if(s->alternate_scan) nCoeffs= 63;
     else nCoeffs= s->block_last_index[n];

     quant_matrix = s->inter_matrix;
     for(i=0; i<=nCoeffs; i++) {
         int j= s->intra_scantable.permutated[i];
         level = block[j];
         if (level) {
             if (level < 0) {
                 level = -level;
                 level = (((level << 1) + 1) * qscale *
                          ((int) (quant_matrix[j]))) >> 4;
                 level = -level;
             } else {
                 level = (((level << 1) + 1) * qscale *
                          ((int) (quant_matrix[j]))) >> 4;
             }
             block[j] = level;
             sum+=level;
         }
     }
     block[63]^=sum&1;
 }
 

 static void dct_unquantize_h263_intra_c(MpegEncContext *s,

                                   DCTELEM *block, int n, int qscale)
 {
     int i, level, qmul, qadd;
     int nCoeffs;

     assert(s->block_last_index[n]>=0);

     qmul = qscale << 1;

     if (!s->h263_aic) {

         block[0] *= n < 4 ? s->y_dc_scale : s->c_dc_scale;

         qadd = (qscale - 1) | 1;
     }else{
         qadd = 0;
     }
     if(s->ac_pred)
         nCoeffs=63;
     else
         nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
 
     for(i=1; i<=nCoeffs; i++) {
         level = block[i];
         if (level) {
             if (level < 0) {
                 level = level * qmul - qadd;
             } else {
                 level = level * qmul + qadd;

             }

             block[i] = level;

         }
     }
 }
 

 static void dct_unquantize_h263_inter_c(MpegEncContext *s,

                                   DCTELEM *block, int n, int qscale)
 {
     int i, level, qmul, qadd;

     int nCoeffs;

     assert(s->block_last_index[n]>=0);

     qadd = (qscale - 1) | 1;
     qmul = qscale << 1;

     nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];

     for(i=0; i<=nCoeffs; i++) {

         level = block[i];
         if (level) {
             if (level < 0) {
                 level = level * qmul - qadd;
             } else {
                 level = level * qmul + qadd;
             }
             block[i] = level;
         }
     }
 }

 /**
  * set qscale and update qscale dependent variables.
  */
 void ff_set_qscale(MpegEncContext * s, int qscale)
 {
     if (qscale < 1)
         qscale = 1;
     else if (qscale > 31)
         qscale = 31;
 
     s->qscale = qscale;
     s->chroma_qscale= s->chroma_qscale_table[qscale];
 
     s->y_dc_scale= s->y_dc_scale_table[ qscale ];
     s->c_dc_scale= s->c_dc_scale_table[ s->chroma_qscale ];
 }

 void ff_MPV_report_decode_progress(MpegEncContext *s)

 {

     if (s->pict_type != AV_PICTURE_TYPE_B && !s->partitioned_frame && !s->error_occurred)

         ff_thread_report_progress(&s->current_picture_ptr->f, s->mb_y, 0);

 }