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  1. /*
  2.  * H.263i decoder
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include "mpegvideo.h"
  22. #include "h263.h"
  23.  
  24. /* don't understand why they choose a different header ! */
  25. int ff_intel_h263_decode_picture_header(MpegEncContext *s)
  26. {
  27.     int format;
  28.  
  29.     /* picture header */
  30.     if (get_bits_long(&s->gb, 22) != 0x20) {
  31.         av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
  32.         return -1;
  33.     }
  34.     s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
  35.  
  36.     if (get_bits1(&s->gb) != 1) {
  37.         av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n");
  38.         return -1;      /* marker */
  39.     }
  40.     if (get_bits1(&s->gb) != 0) {
  41.         av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n");
  42.         return -1;      /* h263 id */
  43.     }
  44.     skip_bits1(&s->gb);         /* split screen off */
  45.     skip_bits1(&s->gb);         /* camera  off */
  46.     skip_bits1(&s->gb);         /* freeze picture release off */
  47.  
  48.     format = get_bits(&s->gb, 3);
  49.     if (format == 0 || format == 6) {
  50.         av_log(s->avctx, AV_LOG_ERROR, "Intel H263 free format not supported\n");
  51.         return -1;
  52.     }
  53.     s->h263_plus = 0;
  54.  
  55.     s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb);
  56.  
  57.     s->h263_long_vectors = get_bits1(&s->gb);
  58.  
  59.     if (get_bits1(&s->gb) != 0) {
  60.         av_log(s->avctx, AV_LOG_ERROR, "SAC not supported\n");
  61.         return -1;      /* SAC: off */
  62.     }
  63.     s->obmc= get_bits1(&s->gb);
  64.     s->unrestricted_mv = s->obmc || s->h263_long_vectors;
  65.     s->pb_frame = get_bits1(&s->gb);
  66.  
  67.     if (format < 6) {
  68.         s->width = ff_h263_format[format][0];
  69.         s->height = ff_h263_format[format][1];
  70.         s->avctx->sample_aspect_ratio.num = 12;
  71.         s->avctx->sample_aspect_ratio.den = 11;
  72.     } else {
  73.         format = get_bits(&s->gb, 3);
  74.         if(format == 0 || format == 7){
  75.             av_log(s->avctx, AV_LOG_ERROR, "Wrong Intel H263 format\n");
  76.             return -1;
  77.         }
  78.         if(get_bits(&s->gb, 2))
  79.             av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
  80.         s->loop_filter = get_bits1(&s->gb) * !s->avctx->lowres;
  81.         if(get_bits1(&s->gb))
  82.             av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
  83.         if(get_bits1(&s->gb))
  84.             s->pb_frame = 2;
  85.         if(get_bits(&s->gb, 5))
  86.             av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
  87.         if(get_bits(&s->gb, 5) != 1)
  88.             av_log(s->avctx, AV_LOG_ERROR, "Invalid marker\n");
  89.     }
  90.     if(format == 6){
  91.         int ar = get_bits(&s->gb, 4);
  92.         skip_bits(&s->gb, 9); // display width
  93.         skip_bits1(&s->gb);
  94.         skip_bits(&s->gb, 9); // display height
  95.         if(ar == 15){
  96.             s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 8); // aspect ratio - width
  97.             s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 8); // aspect ratio - height
  98.         } else {
  99.             s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[ar];
  100.         }
  101.         if (s->avctx->sample_aspect_ratio.num == 0)
  102.             av_log(s->avctx, AV_LOG_ERROR, "Invalid aspect ratio.\n");
  103.     }
  104.  
  105.     s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
  106.     skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
  107.  
  108.     if(s->pb_frame){
  109.         skip_bits(&s->gb, 3); //temporal reference for B-frame
  110.         skip_bits(&s->gb, 2); //dbquant
  111.     }
  112.  
  113.     /* PEI */
  114.     while (get_bits1(&s->gb) != 0) {
  115.         skip_bits(&s->gb, 8);
  116.     }
  117.     s->f_code = 1;
  118.  
  119.     s->y_dc_scale_table=
  120.     s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
  121.  
  122.     ff_h263_show_pict_info(s);
  123.  
  124.     return 0;
  125. }
  126.  
  127. AVCodec ff_h263i_decoder = {
  128.     .name           = "h263i",
  129.     .long_name      = NULL_IF_CONFIG_SMALL("Intel H.263"),
  130.     .type           = AVMEDIA_TYPE_VIDEO,
  131.     .id             = AV_CODEC_ID_H263I,
  132.     .priv_data_size = sizeof(MpegEncContext),
  133.     .init           = ff_h263_decode_init,
  134.     .close          = ff_h263_decode_end,
  135.     .decode         = ff_h263_decode_frame,
  136.     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
  137.     .pix_fmts       = ff_pixfmt_list_420,
  138. };
  139.