/*

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

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

     PutBitContext pb;
     int code;
 
     init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size);
 

     put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); // yes 29.97 -> 29
     put_bits(&pb, 11, FFMIN(s->bit_rate / 1024, 2047));

     put_bits(&pb, 1, w->mspel_bit        = 1);

     put_bits(&pb, 1, s->loop_filter);

     put_bits(&pb, 1, w->abt_flag         = 1);
     put_bits(&pb, 1, w->j_type_bit       = 1);
     put_bits(&pb, 1, w->top_left_mv_flag = 0);
     put_bits(&pb, 1, w->per_mb_rl_bit    = 1);
     put_bits(&pb, 3, code                = 1);

 
     flush_put_bits(&pb);
 
     s->slice_height = s->mb_height / code;
 
     return 0;
 }
 

 static av_cold int wmv2_encode_init(AVCodecContext *avctx)
 {
     Wmv2Context *const w = avctx->priv_data;

     if (ff_mpv_encode_init(avctx) < 0)

         return -1;
 
     ff_wmv2_common_init(w);
 

     avctx->extradata_size = 4;

     avctx->extradata      = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

     if (!avctx->extradata)
         return AVERROR(ENOMEM);

     encode_ext_header(w);
 
     return 0;
 }
 

 int ff_wmv2_encode_picture_header(MpegEncContext *s, int picture_number)

 {

     Wmv2Context *const w = (Wmv2Context *) s;

 
     put_bits(&s->pb, 1, s->pict_type - 1);

     if (s->pict_type == AV_PICTURE_TYPE_I)

         put_bits(&s->pb, 7, 0);
     put_bits(&s->pb, 5, s->qscale);
 

     s->dc_table_index  = 1;
     s->mv_table_index  = 1; /* only if P frame */

     s->per_mb_rl_table = 0;

     s->mspel           = 0;
     w->per_mb_abt      = 0;
     w->abt_type        = 0;
     w->j_type          = 0;

     av_assert0(s->flipflop_rounding);

     if (s->pict_type == AV_PICTURE_TYPE_I) {

         av_assert0(s->no_rounding == 1);

         if (w->j_type_bit)
             put_bits(&s->pb, 1, w->j_type);

         if (w->per_mb_rl_bit)
             put_bits(&s->pb, 1, s->per_mb_rl_table);

         if (!s->per_mb_rl_table) {

             ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
             ff_msmpeg4_code012(&s->pb, s->rl_table_index);
         }
 
         put_bits(&s->pb, 1, s->dc_table_index);
 

         s->inter_intra_pred = 0;
     } else {

         int cbp_index;
 
         put_bits(&s->pb, 2, SKIP_TYPE_NONE);
 

         ff_msmpeg4_code012(&s->pb, cbp_index = 0);
         if (s->qscale <= 10) {
             int map[3]         = { 0, 2, 1 };
             w->cbp_table_index = map[cbp_index];
         } else if (s->qscale <= 20) {
             int map[3]         = { 1, 0, 2 };
             w->cbp_table_index = map[cbp_index];
         } else {
             int map[3]         = { 2, 1, 0 };
             w->cbp_table_index = map[cbp_index];

         }
 

         if (w->mspel_bit)
             put_bits(&s->pb, 1, s->mspel);

         if (w->abt_flag) {
             put_bits(&s->pb, 1, w->per_mb_abt ^ 1);
             if (!w->per_mb_abt)

                 ff_msmpeg4_code012(&s->pb, w->abt_type);
         }
 

         if (w->per_mb_rl_bit)
             put_bits(&s->pb, 1, s->per_mb_rl_table);

         if (!s->per_mb_rl_table) {

             ff_msmpeg4_code012(&s->pb, s->rl_table_index);
             s->rl_chroma_table_index = s->rl_table_index;
         }
         put_bits(&s->pb, 1, s->dc_table_index);
         put_bits(&s->pb, 1, s->mv_table_index);
 

         s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE);

     }

     s->esc3_level_length = 0;
     s->esc3_run_length   = 0;

 
     return 0;
 }
 
 /* Nearly identical to wmv1 but that is just because we do not use the
  * useless M$ crap features. It is duplicated here in case someone wants
  * to add support for these crap features. */

 void ff_wmv2_encode_mb(MpegEncContext *s, int16_t block[6][64],

                        int motion_x, int motion_y)
 {

     Wmv2Context *const w = (Wmv2Context *) s;

     int cbp, coded_cbp, i;
     int pred_x, pred_y;
     uint8_t *coded_block;
 
     ff_msmpeg4_handle_slices(s);
 
     if (!s->mb_intra) {
         /* compute cbp */
         cbp = 0;

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

             if (s->block_last_index[i] >= 0)
                 cbp |= 1 << (5 - i);
 
         put_bits(&s->pb,

                  ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
                  ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);

         s->misc_bits += get_bits_diff(s);

         /* motion vector */

         ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);

         ff_msmpeg4_encode_motion(s, motion_x - pred_x,

                                  motion_y - pred_y);

         s->mv_bits += get_bits_diff(s);

     } else {
         /* compute cbp */

         cbp       = 0;

         coded_cbp = 0;
         for (i = 0; i < 6; i++) {
             int val, pred;

             val  = (s->block_last_index[i] >= 1);

             cbp |= val << (5 - i);
             if (i < 4) {
                 /* predict value for close blocks only for luma */

                 pred         = ff_msmpeg4_coded_block_pred(s, i, &coded_block);

                 *coded_block = val;

                 val          = val ^ pred;

             }
             coded_cbp |= val << (5 - i);
         }
 

         if (s->pict_type == AV_PICTURE_TYPE_I)

             put_bits(&s->pb,

                      ff_msmp4_mb_i_table[coded_cbp][1],
                      ff_msmp4_mb_i_table[coded_cbp][0]);
         else

             put_bits(&s->pb,

                      ff_wmv2_inter_table[w->cbp_table_index][cbp][1],
                      ff_wmv2_inter_table[w->cbp_table_index][cbp][0]);

         put_bits(&s->pb, 1, 0);         /* no AC prediction yet */

         if (s->inter_intra_pred) {
             s->h263_aic_dir = 0;
             put_bits(&s->pb,
                      ff_table_inter_intra[s->h263_aic_dir][1],
                      ff_table_inter_intra[s->h263_aic_dir][0]);

         }

         s->misc_bits += get_bits_diff(s);

     }
 

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

         ff_msmpeg4_encode_block(s, block[i], i);

     if (s->mb_intra)
         s->i_tex_bits += get_bits_diff(s);
     else
         s->p_tex_bits += get_bits_diff(s);

 }
 

 FF_MPV_GENERIC_CLASS(wmv2)
 

 AVCodec ff_wmv2_encoder = {

     .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_encode_init,

     .encode2        = ff_mpv_encode_picture,
     .close          = ff_mpv_encode_end,

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

     .priv_class     = &wmv2_class,

 };