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  1. /*
  2.  * FLV decoding.
  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 "libavutil/imgutils.h"
  22.  
  23. #include "flv.h"
  24. #include "h263.h"
  25. #include "mpegvideo.h"
  26. #include "mpegvideodata.h"
  27.  
  28. int ff_flv_decode_picture_header(MpegEncContext *s)
  29. {
  30.     int format, width, height;
  31.  
  32.     /* picture header */
  33.     if (get_bits_long(&s->gb, 17) != 1) {
  34.         av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
  35.         return AVERROR_INVALIDDATA;
  36.     }
  37.     format = get_bits(&s->gb, 5);
  38.     if (format != 0 && format != 1) {
  39.         av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n");
  40.         return AVERROR_INVALIDDATA;
  41.     }
  42.     s->h263_flv       = format + 1;
  43.     s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
  44.     format            = get_bits(&s->gb, 3);
  45.     switch (format) {
  46.     case 0:
  47.         width  = get_bits(&s->gb, 8);
  48.         height = get_bits(&s->gb, 8);
  49.         break;
  50.     case 1:
  51.         width  = get_bits(&s->gb, 16);
  52.         height = get_bits(&s->gb, 16);
  53.         break;
  54.     case 2:
  55.         width  = 352;
  56.         height = 288;
  57.         break;
  58.     case 3:
  59.         width  = 176;
  60.         height = 144;
  61.         break;
  62.     case 4:
  63.         width  = 128;
  64.         height = 96;
  65.         break;
  66.     case 5:
  67.         width  = 320;
  68.         height = 240;
  69.         break;
  70.     case 6:
  71.         width  = 160;
  72.         height = 120;
  73.         break;
  74.     default:
  75.         width = height = 0;
  76.         break;
  77.     }
  78.     if (av_image_check_size(width, height, 0, s->avctx))
  79.         return AVERROR(EINVAL);
  80.     s->width  = width;
  81.     s->height = height;
  82.  
  83.     s->pict_type = AV_PICTURE_TYPE_I + get_bits(&s->gb, 2);
  84.     s->droppable = s->pict_type > AV_PICTURE_TYPE_P;
  85.     if (s->droppable)
  86.         s->pict_type = AV_PICTURE_TYPE_P;
  87.  
  88.     skip_bits1(&s->gb); /* deblocking flag */
  89.     s->chroma_qscale = s->qscale = get_bits(&s->gb, 5);
  90.  
  91.     s->h263_plus = 0;
  92.  
  93.     s->unrestricted_mv   = 1;
  94.     s->h263_long_vectors = 0;
  95.  
  96.     /* PEI */
  97.     if (skip_1stop_8data_bits(&s->gb) < 0)
  98.         return AVERROR_INVALIDDATA;
  99.  
  100.     s->f_code = 1;
  101.  
  102.     if (s->ehc_mode)
  103.         s->avctx->sample_aspect_ratio= (AVRational){1,2};
  104.  
  105.     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
  106.         av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n",
  107.                s->droppable ? 'D' : av_get_picture_type_char(s->pict_type),
  108.                s->h263_flv - 1, s->qscale, s->picture_number);
  109.     }
  110.  
  111.     s->y_dc_scale_table = s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
  112.  
  113.     return 0;
  114. }
  115.  
  116. AVCodec ff_flv_decoder = {
  117.     .name           = "flv",
  118.     .long_name      = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
  119.     .type           = AVMEDIA_TYPE_VIDEO,
  120.     .id             = AV_CODEC_ID_FLV1,
  121.     .priv_data_size = sizeof(MpegEncContext),
  122.     .init           = ff_h263_decode_init,
  123.     .close          = ff_h263_decode_end,
  124.     .decode         = ff_h263_decode_frame,
  125.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
  126.     .max_lowres     = 3,
  127.     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
  128.                                                      AV_PIX_FMT_NONE },
  129. };
  130.