/*

  * Copyright (c) 2002 The FFmpeg Project

  *
  * 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
  */
 
 #include "avcodec.h"

 #include "h263.h"

 #include "intrax8.h"

 #include "mathops.h"

 #include "mpegutils.h"
 #include "mpegvideo.h"

 #include "msmpeg4.h"
 #include "msmpeg4data.h"
 #include "wmv2.h"
 
 

 static void parse_mb_skip(Wmv2Context *w)
 {

     int mb_x, mb_y;

     MpegEncContext *const s = &w->s;
     uint32_t *const mb_type = s->current_picture_ptr->mb_type;

     w->skip_type = get_bits(&s->gb, 2);
     switch (w->skip_type) {

     case SKIP_TYPE_NONE:

         for (mb_y = 0; mb_y < s->mb_height; mb_y++)
             for (mb_x = 0; mb_x < s->mb_width; mb_x++)
                 mb_type[mb_y * s->mb_stride + mb_x] =
                     MB_TYPE_16x16 | MB_TYPE_L0;

         break;
     case SKIP_TYPE_MPEG:

         for (mb_y = 0; mb_y < s->mb_height; mb_y++)
             for (mb_x = 0; mb_x < s->mb_width; mb_x++)
                 mb_type[mb_y * s->mb_stride + mb_x] =
                     (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;

         break;
     case SKIP_TYPE_ROW:

         for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
             if (get_bits1(&s->gb)) {
                 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
                     mb_type[mb_y * s->mb_stride + mb_x] =
                         MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
             } else {
                 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
                     mb_type[mb_y * s->mb_stride + mb_x] =
                         (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;

             }
         }
         break;
     case SKIP_TYPE_COL:

         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
             if (get_bits1(&s->gb)) {
                 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
                     mb_type[mb_y * s->mb_stride + mb_x] =
                         MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
             } else {
                 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
                     mb_type[mb_y * s->mb_stride + mb_x] =
                         (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;

             }
         }
         break;
     }
 }
 

 static int decode_ext_header(Wmv2Context *w)
 {
     MpegEncContext *const s = &w->s;

     GetBitContext gb;
     int fps;
     int code;
 

     if (s->avctx->extradata_size < 4)

         return AVERROR_INVALIDDATA;

     init_get_bits(&gb, s->avctx->extradata, 32);

     fps                 = get_bits(&gb, 5);
     s->bit_rate         = get_bits(&gb, 11) * 1024;
     w->mspel_bit        = get_bits1(&gb);
     s->loop_filter      = get_bits1(&gb);
     w->abt_flag         = get_bits1(&gb);
     w->j_type_bit       = get_bits1(&gb);
     w->top_left_mv_flag = get_bits1(&gb);
     w->per_mb_rl_bit    = get_bits1(&gb);
     code                = get_bits(&gb, 3);
 
     if (code == 0)

         return AVERROR_INVALIDDATA;

 
     s->slice_height = s->mb_height / code;
 

     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
         av_log(s->avctx, AV_LOG_DEBUG,
                "fps:%d, br:%d, qpbit:%d, abt_flag:%d, j_type_bit:%d, "
                "tl_mv_flag:%d, mbrl_bit:%d, code:%d, loop_filter:%d, "
                "slices:%d\n",
                fps, s->bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit,
                w->top_left_mv_flag, w->per_mb_rl_bit, code, s->loop_filter,
                code);

     return 0;
 }
 

 int ff_wmv2_decode_picture_header(MpegEncContext *s)

 {

     Wmv2Context *const w = (Wmv2Context *) s;

     int code;
 

     if (s->picture_number == 0)

         decode_ext_header(w);
 
     s->pict_type = get_bits1(&s->gb) + 1;

     if (s->pict_type == AV_PICTURE_TYPE_I) {

         code = get_bits(&s->gb, 7);
         av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code);
     }

     s->chroma_qscale = s->qscale = get_bits(&s->gb, 5);
     if (s->qscale <= 0)

         return AVERROR_INVALIDDATA;

 
     return 0;
 }
 

 int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)

 {

     Wmv2Context *const w = (Wmv2Context *) s;

     if (s->pict_type == AV_PICTURE_TYPE_I) {

         if (w->j_type_bit)
             w->j_type = get_bits1(&s->gb);
         else
             w->j_type = 0; // FIXME check
 
         if (!w->j_type) {
             if (w->per_mb_rl_bit)
                 s->per_mb_rl_table = get_bits1(&s->gb);
             else
                 s->per_mb_rl_table = 0;
 
             if (!s->per_mb_rl_table) {

                 s->rl_chroma_table_index = decode012(&s->gb);

                 s->rl_table_index        = decode012(&s->gb);

             }
 
             s->dc_table_index = get_bits1(&s->gb);
         }

         s->inter_intra_pred = 0;
         s->no_rounding      = 1;
         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
             av_log(s->avctx, AV_LOG_DEBUG,
                    "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n",
                    s->qscale, s->rl_chroma_table_index, s->rl_table_index,
                    s->dc_table_index, s->per_mb_rl_table, w->j_type);

         }

     } else {

         int cbp_index;

         w->j_type = 0;

 
         parse_mb_skip(w);

         cbp_index = decode012(&s->gb);

         w->cbp_table_index = wmv2_get_cbp_table_index(s, cbp_index);

         if (w->mspel_bit)
             s->mspel = get_bits1(&s->gb);
         else
             s->mspel = 0; // FIXME check

         if (w->abt_flag) {
             w->per_mb_abt = get_bits1(&s->gb) ^ 1;
             if (!w->per_mb_abt)
                 w->abt_type = decode012(&s->gb);

         }
 

         if (w->per_mb_rl_bit)
             s->per_mb_rl_table = get_bits1(&s->gb);
         else
             s->per_mb_rl_table = 0;

         if (!s->per_mb_rl_table) {
             s->rl_table_index        = decode012(&s->gb);

             s->rl_chroma_table_index = s->rl_table_index;
         }
 

         s->dc_table_index   = get_bits1(&s->gb);
         s->mv_table_index   = get_bits1(&s->gb);
 
         s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE);
         s->no_rounding     ^= 1;
 
         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
             av_log(s->avctx, AV_LOG_DEBUG,
                    "rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d mspel:%d "
                    "per_mb_abt:%d abt_type:%d cbp:%d ii:%d\n",
                    s->rl_table_index, s->rl_chroma_table_index,
                    s->dc_table_index, s->mv_table_index,
                    s->per_mb_rl_table, s->qscale, s->mspel,
                    w->per_mb_abt, w->abt_type, w->cbp_table_index,
                    s->inter_intra_pred);

         }
     }

     s->esc3_level_length = 0;
     s->esc3_run_length   = 0;
     s->picture_number++; // FIXME ?

     if (w->j_type) {
         ff_intrax8_decode_picture(&w->x8, 2 * s->qscale, (s->qscale - 1) | 1);

         return 1;
     }
 
     return 0;
 }
 

 static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr)
 {
     MpegEncContext *const s = &w->s;

     int ret;
 

     ret = ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);

     if (ret < 0)

         return ret;

     if ((((*mx_ptr) | (*my_ptr)) & 1) && s->mspel)
         w->hshift = get_bits1(&s->gb);

     else

         w->hshift = 0;

 
     return 0;
 }
 

 static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py)
 {
     MpegEncContext *const s = &w->s;

     int xy, wrap, diff, type;
     int16_t *A, *B, *C, *mot_val;
 

     wrap    = s->b8_stride;
     xy      = s->block_index[0];

     mot_val = s->current_picture.motion_val[0][xy];

     A       = s->current_picture.motion_val[0][xy     - 1];
     B       = s->current_picture.motion_val[0][xy     - wrap];
     C       = s->current_picture.motion_val[0][xy + 2 - wrap];

     if (s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag)
         diff = FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1]));

     else

         diff = 0;

     if (diff >= 8)
         type = get_bits1(&s->gb);

     else

         type = 2;
 
     if (type == 0) {
         *px = A[0];
         *py = A[1];
     } else if (type == 1) {
         *px = B[0];
         *py = B[1];
     } else {

         /* special case for first (slice) line */
         if (s->first_slice_line) {
             *px = A[0];
             *py = A[1];
         } else {
             *px = mid_pred(A[0], B[0], C[0]);
             *py = mid_pred(A[1], B[1], C[1]);
         }
     }
 
     return mot_val;
 }
 

 static inline int wmv2_decode_inter_block(Wmv2Context *w, int16_t *block,
                                           int n, int cbp)
 {
     MpegEncContext *const s = &w->s;
     static const int sub_cbp_table[3] = { 2, 3, 1 };

     int sub_cbp, ret;

     if (!cbp) {

         s->block_last_index[n] = -1;
         return 0;
     }
 

     if (w->per_block_abt)
         w->abt_type = decode012(&s->gb);
     w->abt_type_table[n] = w->abt_type;

     if (w->abt_type) {
 //        const uint8_t *scantable = w->abt_scantable[w->abt_type - 1].permutated;
         const uint8_t *scantable = w->abt_scantable[w->abt_type - 1].scantable;
 //        const uint8_t *scantable = w->abt_type - 1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable;

         sub_cbp = sub_cbp_table[decode012(&s->gb)];

         if (sub_cbp & 1)

             if ((ret = ff_msmpeg4_decode_block(s, block, n, 1, scantable)) < 0)
                 return ret;

         if (sub_cbp & 2)

             if ((ret = ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable)) < 0)
                 return ret;

         s->block_last_index[n] = 63;
 
         return 0;

     } else {
         return ff_msmpeg4_decode_block(s, block, n, 1,
                                        s->inter_scantable.permutated);

     }
 }
 

 int ff_wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64])

 {

     Wmv2Context *const w = (Wmv2Context *) s;

     int cbp, code, i, ret;

     uint8_t *coded_val;
 

     if (w->j_type)
         return 0;

     if (s->pict_type == AV_PICTURE_TYPE_P) {

         if (IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])) {

             /* skip mb */
             s->mb_intra = 0;

             for (i = 0; i < 6; i++)

                 s->block_last_index[i] = -1;

             s->mv_dir      = MV_DIR_FORWARD;
             s->mv_type     = MV_TYPE_16X16;

             s->mv[0][0][0] = 0;
             s->mv[0][0][1] = 0;

             s->mb_skipped  = 1;
             w->hshift      = 0;

             return 0;
         }
 

         code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index].table,
                         MB_NON_INTRA_VLC_BITS, 3);

         if (code < 0)

             return AVERROR_INVALIDDATA;

         s->mb_intra = (~code & 0x40) >> 6;
 
         cbp = code & 0x3f;
     } else {
         s->mb_intra = 1;
         code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

         if (code < 0) {
             av_log(s->avctx, AV_LOG_ERROR,
                    "II-cbp illegal at %d %d\n", s->mb_x, s->mb_y);

             return AVERROR_INVALIDDATA;

         }
         /* predict coded block pattern */
         cbp = 0;

         for (i = 0; i < 6; i++) {

             int val = ((code >> (5 - i)) & 1);
             if (i < 4) {

                 int pred   = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
                 val        = val ^ pred;

                 *coded_val = val;
             }
             cbp |= val << (5 - i);
         }
     }
 
     if (!s->mb_intra) {
         int mx, my;
         wmv2_pred_motion(w, &mx, &my);
 

         if (cbp) {

             s->bdsp.clear_blocks(s->block[0]);

             if (s->per_mb_rl_table) {
                 s->rl_table_index        = decode012(&s->gb);

                 s->rl_chroma_table_index = s->rl_table_index;
             }
 

             if (w->abt_flag && w->per_mb_abt) {
                 w->per_block_abt = get_bits1(&s->gb);
                 if (!w->per_block_abt)
                     w->abt_type = decode012(&s->gb);
             } else
                 w->per_block_abt = 0;

         }
 

         if ((ret = wmv2_decode_motion(w, &mx, &my)) < 0)
             return ret;

         s->mv_dir      = MV_DIR_FORWARD;
         s->mv_type     = MV_TYPE_16X16;

         s->mv[0][0][0] = mx;
         s->mv[0][0][1] = my;
 
         for (i = 0; i < 6; i++) {

             if ((ret = wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1)) < 0) {

                 av_log(s->avctx, AV_LOG_ERROR,
                        "\nerror while decoding inter block: %d x %d (%d)\n",
                        s->mb_x, s->mb_y, i);

                 return ret;

             }
         }
     } else {

         if (s->pict_type == AV_PICTURE_TYPE_P)

             av_dlog(s->avctx, "%d%d ", s->inter_intra_pred, cbp);
         av_dlog(s->avctx, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,

                 ((cbp & 3) ? 1 : 0) + ((cbp & 0x3C) ? 2 : 0),

                 show_bits(&s->gb, 24));

         s->ac_pred = get_bits1(&s->gb);

         if (s->inter_intra_pred) {
             s->h263_aic_dir = get_vlc2(&s->gb, ff_inter_intra_vlc.table,
                                        INTER_INTRA_VLC_BITS, 1);

             av_dlog(s->avctx, "%d%d %d %d/",
                     s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);

         }

         if (s->per_mb_rl_table && cbp) {
             s->rl_table_index        = decode012(&s->gb);

             s->rl_chroma_table_index = s->rl_table_index;
         }
 

         s->bdsp.clear_blocks(s->block[0]);

         for (i = 0; i < 6; i++) {

             if ((ret = ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL)) < 0) {

                 av_log(s->avctx, AV_LOG_ERROR,
                        "\nerror while decoding intra block: %d x %d (%d)\n",
                        s->mb_x, s->mb_y, i);

                 return ret;

             }
         }
     }
 
     return 0;
 }
 

 static av_cold int wmv2_decode_init(AVCodecContext *avctx)
 {
     Wmv2Context *const w = avctx->priv_data;

     int ret;

     avctx->flags |= CODEC_FLAG_EMU_EDGE;
 

     if ((ret = ff_msmpeg4_decode_init(avctx)) < 0)
         return ret;

 
     ff_wmv2_common_init(w);
 

     ff_intrax8_common_init(&w->x8, &w->s);

 
     return 0;
 }
 

 static av_cold int wmv2_decode_end(AVCodecContext *avctx)

 {
     Wmv2Context *w = avctx->priv_data;
 
     ff_intrax8_common_end(&w->x8);
     return ff_h263_decode_end(avctx);
 }
 

 AVCodec ff_wmv2_decoder = {

     .name           = "wmv2",

     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),

     .type           = AVMEDIA_TYPE_VIDEO,

     .id             = AV_CODEC_ID_WMV2,

     .priv_data_size = sizeof(Wmv2Context),
     .init           = wmv2_decode_init,
     .close          = wmv2_decode_end,
     .decode         = ff_h263_decode_frame,
     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,

     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
                                                      AV_PIX_FMT_NONE },

 };