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  1. /*
  2.  * FLV decoding.
  3.  * This file is part of FFmpeg.
  4.  *
  5.  * FFmpeg is free software; you can redistribute it and/or
  6.  * modify it under the terms of the GNU Lesser General Public
  7.  * License as published by the Free Software Foundation; either
  8.  * version 2.1 of the License, or (at your option) any later version.
  9.  *
  10.  * FFmpeg is distributed in the hope that it will be useful,
  11.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13.  * Lesser General Public License for more details.
  14.  *
  15.  * You should have received a copy of the GNU Lesser General Public
  16.  * License along with FFmpeg; if not, write to the Free Software
  17.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18.  */
  19.  
  20. #include "mpegvideo.h"
  21. #include "h263.h"
  22. #include "flv.h"
  23. #include "libavutil/imgutils.h"
  24.  
  25. void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last){
  26.     int is11 = get_bits1(gb);
  27.     *last = get_bits1(gb);
  28.     *run = get_bits(gb, 6);
  29.     if(is11){
  30.         *level = get_sbits(gb, 11);
  31.     } else {
  32.         *level = get_sbits(gb, 7);
  33.     }
  34. }
  35.  
  36. int ff_flv_decode_picture_header(MpegEncContext *s)
  37. {
  38.     int format, width, height;
  39.  
  40.     /* picture header */
  41.     if (get_bits_long(&s->gb, 17) != 1) {
  42.         av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
  43.         return AVERROR_INVALIDDATA;
  44.     }
  45.     format = get_bits(&s->gb, 5);
  46.     if (format != 0 && format != 1) {
  47.         av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n");
  48.         return AVERROR_INVALIDDATA;
  49.     }
  50.     s->h263_flv = format+1;
  51.     s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
  52.     format = get_bits(&s->gb, 3);
  53.     switch (format) {
  54.     case 0:
  55.         width = get_bits(&s->gb, 8);
  56.         height = get_bits(&s->gb, 8);
  57.         break;
  58.     case 1:
  59.         width = get_bits(&s->gb, 16);
  60.         height = get_bits(&s->gb, 16);
  61.         break;
  62.     case 2:
  63.         width = 352;
  64.         height = 288;
  65.         break;
  66.     case 3:
  67.         width = 176;
  68.         height = 144;
  69.         break;
  70.     case 4:
  71.         width = 128;
  72.         height = 96;
  73.         break;
  74.     case 5:
  75.         width = 320;
  76.         height = 240;
  77.         break;
  78.     case 6:
  79.         width = 160;
  80.         height = 120;
  81.         break;
  82.     default:
  83.         width = height = 0;
  84.         break;
  85.     }
  86.     if(av_image_check_size(width, height, 0, s->avctx))
  87.         return AVERROR(EINVAL);
  88.     s->width = width;
  89.     s->height = height;
  90.  
  91.     s->pict_type = AV_PICTURE_TYPE_I + get_bits(&s->gb, 2);
  92.     s->droppable = s->pict_type > AV_PICTURE_TYPE_P;
  93.     if (s->droppable)
  94.         s->pict_type = AV_PICTURE_TYPE_P;
  95.  
  96.     skip_bits1(&s->gb); /* deblocking flag */
  97.     s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
  98.  
  99.     s->h263_plus = 0;
  100.  
  101.     s->unrestricted_mv = 1;
  102.     s->h263_long_vectors = 0;
  103.  
  104.     /* PEI */
  105.     while (get_bits1(&s->gb) != 0) {
  106.         skip_bits(&s->gb, 8);
  107.     }
  108.     s->f_code = 1;
  109.  
  110.     if (s->ehc_mode)
  111.         s->avctx->sample_aspect_ratio= (AVRational){1,2};
  112.  
  113.     if(s->avctx->debug & FF_DEBUG_PICT_INFO){
  114.         av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n",
  115.                s->droppable ? 'D' : av_get_picture_type_char(s->pict_type),
  116.                s->h263_flv - 1, s->qscale, s->picture_number);
  117.     }
  118.  
  119.     s->y_dc_scale_table=
  120.     s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
  121.  
  122.     return 0;
  123. }
  124.  
  125. AVCodec ff_flv_decoder = {
  126.     .name           = "flv",
  127.     .long_name      = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
  128.     .type           = AVMEDIA_TYPE_VIDEO,
  129.     .id             = AV_CODEC_ID_FLV1,
  130.     .priv_data_size = sizeof(MpegEncContext),
  131.     .init           = ff_h263_decode_init,
  132.     .close          = ff_h263_decode_end,
  133.     .decode         = ff_h263_decode_frame,
  134.     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
  135.     .max_lowres     = 3,
  136.     .pix_fmts       = ff_pixfmt_list_420,
  137. };
  138.