Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | RSS feed

  1. /*
  2.  * Copyright (c) 2010 David Conrad
  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 "avformat.h"
  22. #include "internal.h"
  23. #include "riff.h"
  24. #include "libavutil/intreadwrite.h"
  25.  
  26. static int probe(AVProbeData *p)
  27. {
  28.     if (AV_RL32(p->buf) == MKTAG('D','K','I','F')
  29.         && !AV_RL16(p->buf+4) && AV_RL16(p->buf+6) == 32)
  30.         return AVPROBE_SCORE_MAX-2;
  31.  
  32.     return 0;
  33. }
  34.  
  35. static int read_header(AVFormatContext *s)
  36. {
  37.     AVStream *st;
  38.     AVRational time_base;
  39.  
  40.     avio_rl32(s->pb); // DKIF
  41.     avio_rl16(s->pb); // version
  42.     avio_rl16(s->pb); // header size
  43.  
  44.     st = avformat_new_stream(s, NULL);
  45.     if (!st)
  46.         return AVERROR(ENOMEM);
  47.  
  48.  
  49.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  50.     st->codec->codec_tag  = avio_rl32(s->pb);
  51.     st->codec->codec_id   = ff_codec_get_id(ff_codec_bmp_tags, st->codec->codec_tag);
  52.     st->codec->width      = avio_rl16(s->pb);
  53.     st->codec->height     = avio_rl16(s->pb);
  54.     time_base.den         = avio_rl32(s->pb);
  55.     time_base.num         = avio_rl32(s->pb);
  56.     st->duration          = avio_rl64(s->pb);
  57.  
  58.     st->need_parsing      = AVSTREAM_PARSE_HEADERS;
  59.  
  60.     if (!time_base.den || !time_base.num) {
  61.         av_log(s, AV_LOG_ERROR, "Invalid frame rate\n");
  62.         return AVERROR_INVALIDDATA;
  63.     }
  64.  
  65.     avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
  66.  
  67.     return 0;
  68. }
  69.  
  70. static int read_packet(AVFormatContext *s, AVPacket *pkt)
  71. {
  72.     int ret, size = avio_rl32(s->pb);
  73.     int64_t   pts = avio_rl64(s->pb);
  74.  
  75.     ret = av_get_packet(s->pb, pkt, size);
  76.     pkt->stream_index = 0;
  77.     pkt->pts          = pts;
  78.     pkt->pos         -= 12;
  79.  
  80.     return ret;
  81. }
  82.  
  83. AVInputFormat ff_ivf_demuxer = {
  84.     .name           = "ivf",
  85.     .long_name      = NULL_IF_CONFIG_SMALL("On2 IVF"),
  86.     .read_probe     = probe,
  87.     .read_header    = read_header,
  88.     .read_packet    = read_packet,
  89.     .flags          = AVFMT_GENERIC_INDEX,
  90.     .codec_tag      = (const AVCodecTag* const []){ ff_codec_bmp_tags, 0 },
  91. };
  92.