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  1. /*
  2.  * LVF demuxer
  3.  * Copyright (c) 2012 Paul B Mahol
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "libavutil/intreadwrite.h"
  23. #include "avformat.h"
  24. #include "riff.h"
  25.  
  26. static int lvf_probe(AVProbeData *p)
  27. {
  28.     if (AV_RL32(p->buf) != MKTAG('L', 'V', 'F', 'F'))
  29.         return 0;
  30.  
  31.     if (!AV_RL32(p->buf + 16) || AV_RL32(p->buf + 16) > 256)
  32.         return AVPROBE_SCORE_MAX / 8;
  33.  
  34.     return AVPROBE_SCORE_EXTENSION;
  35. }
  36.  
  37. static int lvf_read_header(AVFormatContext *s)
  38. {
  39.     AVStream *st;
  40.     int64_t next_offset;
  41.     unsigned size, nb_streams, id;
  42.  
  43.     avio_skip(s->pb, 16);
  44.     nb_streams = avio_rl32(s->pb);
  45.     if (!nb_streams)
  46.         return AVERROR_INVALIDDATA;
  47.     if (nb_streams > 2) {
  48.         avpriv_request_sample(s, "%d streams", nb_streams);
  49.         return AVERROR_PATCHWELCOME;
  50.     }
  51.  
  52.     avio_skip(s->pb, 1012);
  53.  
  54.     while (!avio_feof(s->pb)) {
  55.         id          = avio_rl32(s->pb);
  56.         size        = avio_rl32(s->pb);
  57.         next_offset = avio_tell(s->pb) + size;
  58.  
  59.         switch (id) {
  60.         case MKTAG('0', '0', 'f', 'm'):
  61.             st = avformat_new_stream(s, 0);
  62.             if (!st)
  63.                 return AVERROR(ENOMEM);
  64.  
  65.             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  66.             avio_skip(s->pb, 4);
  67.             st->codec->width      = avio_rl32(s->pb);
  68.             st->codec->height     = avio_rl32(s->pb);
  69.             avio_skip(s->pb, 4);
  70.             st->codec->codec_tag  = avio_rl32(s->pb);
  71.             st->codec->codec_id   = ff_codec_get_id(ff_codec_bmp_tags,
  72.                                                     st->codec->codec_tag);
  73.             avpriv_set_pts_info(st, 32, 1, 1000);
  74.             break;
  75.         case MKTAG('0', '1', 'f', 'm'):
  76.             st = avformat_new_stream(s, 0);
  77.             if (!st)
  78.                 return AVERROR(ENOMEM);
  79.  
  80.             st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
  81.             st->codec->codec_tag   = avio_rl16(s->pb);
  82.             st->codec->channels    = avio_rl16(s->pb);
  83.             st->codec->sample_rate = avio_rl16(s->pb);
  84.             avio_skip(s->pb, 8);
  85.             st->codec->bits_per_coded_sample = avio_r8(s->pb);
  86.             st->codec->codec_id    = ff_codec_get_id(ff_codec_wav_tags,
  87.                                                      st->codec->codec_tag);
  88.             avpriv_set_pts_info(st, 32, 1, 1000);
  89.             break;
  90.         case 0:
  91.             avio_seek(s->pb, 2048 + 8, SEEK_SET);
  92.             return 0;
  93.         default:
  94.             avpriv_request_sample(s, "id %d", id);
  95.             return AVERROR_PATCHWELCOME;
  96.         }
  97.  
  98.         avio_seek(s->pb, next_offset, SEEK_SET);
  99.     }
  100.  
  101.     return AVERROR_EOF;
  102. }
  103.  
  104. static int lvf_read_packet(AVFormatContext *s, AVPacket *pkt)
  105. {
  106.     unsigned size, flags, timestamp, id;
  107.     int64_t pos;
  108.     int ret, is_video = 0;
  109.  
  110.     pos = avio_tell(s->pb);
  111.     while (!avio_feof(s->pb)) {
  112.         id    = avio_rl32(s->pb);
  113.         size  = avio_rl32(s->pb);
  114.  
  115.         if (size == 0xFFFFFFFFu)
  116.             return AVERROR_EOF;
  117.  
  118.         switch (id) {
  119.         case MKTAG('0', '0', 'd', 'c'):
  120.             is_video = 1;
  121.         case MKTAG('0', '1', 'w', 'b'):
  122.             if (size < 8)
  123.                 return AVERROR_INVALIDDATA;
  124.             timestamp = avio_rl32(s->pb);
  125.             flags = avio_rl32(s->pb);
  126.             ret = av_get_packet(s->pb, pkt, size - 8);
  127.             if (flags & (1 << 12))
  128.                 pkt->flags |= AV_PKT_FLAG_KEY;
  129.             pkt->stream_index = is_video ? 0 : 1;
  130.             pkt->pts          = timestamp;
  131.             pkt->pos          = pos;
  132.             return ret;
  133.         default:
  134.             ret = avio_skip(s->pb, size);
  135.         }
  136.  
  137.         if (ret < 0)
  138.             return ret;
  139.     }
  140.  
  141.     return AVERROR_EOF;
  142. }
  143.  
  144. AVInputFormat ff_lvf_demuxer = {
  145.     .name        = "lvf",
  146.     .long_name   = NULL_IF_CONFIG_SMALL("LVF"),
  147.     .read_probe  = lvf_probe,
  148.     .read_header = lvf_read_header,
  149.     .read_packet = lvf_read_packet,
  150.     .extensions  = "lvf",
  151.     .flags       = AVFMT_GENERIC_INDEX,
  152. };
  153.