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  1. /*
  2.  * Chronomaster DFA Format Demuxer
  3.  * Copyright (c) 2011 Konstantin Shishkov
  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 "internal.h"
  25.  
  26. static int dfa_probe(AVProbeData *p)
  27. {
  28.     if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('D', 'F', 'I', 'A'))
  29.         return 0;
  30.  
  31.     return AVPROBE_SCORE_MAX;
  32. }
  33.  
  34. static int dfa_read_header(AVFormatContext *s)
  35. {
  36.     AVIOContext *pb = s->pb;
  37.     AVStream *st;
  38.     int frames;
  39.     int version;
  40.     uint32_t mspf;
  41.  
  42.     if (avio_rl32(pb) != MKTAG('D', 'F', 'I', 'A')) {
  43.         av_log(s, AV_LOG_ERROR, "Invalid magic for DFA\n");
  44.         return AVERROR_INVALIDDATA;
  45.     }
  46.  
  47.     version = avio_rl16(pb);
  48.     frames = avio_rl16(pb);
  49.  
  50.     st = avformat_new_stream(s, NULL);
  51.     if (!st)
  52.         return AVERROR(ENOMEM);
  53.  
  54.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  55.     st->codec->codec_id   = AV_CODEC_ID_DFA;
  56.     st->codec->width      = avio_rl16(pb);
  57.     st->codec->height     = avio_rl16(pb);
  58.     mspf = avio_rl32(pb);
  59.     if (!mspf) {
  60.         av_log(s, AV_LOG_WARNING, "Zero FPS reported, defaulting to 10\n");
  61.         mspf = 100;
  62.     }
  63.     avpriv_set_pts_info(st, 24, mspf, 1000);
  64.     avio_skip(pb, 128 - 16); // padding
  65.     st->duration = frames;
  66.  
  67.     if (ff_alloc_extradata(st->codec, 2))
  68.         return AVERROR(ENOMEM);
  69.     AV_WL16(st->codec->extradata, version);
  70.     if (version == 0x100)
  71.         st->sample_aspect_ratio = (AVRational){2, 1};
  72.  
  73.     return 0;
  74. }
  75.  
  76. static int dfa_read_packet(AVFormatContext *s, AVPacket *pkt)
  77. {
  78.     AVIOContext *pb = s->pb;
  79.     uint32_t frame_size;
  80.     int ret, first = 1;
  81.  
  82.     if (pb->eof_reached)
  83.         return AVERROR_EOF;
  84.  
  85.     if (av_get_packet(pb, pkt, 12) != 12)
  86.         return AVERROR(EIO);
  87.     while (!pb->eof_reached) {
  88.         if (!first) {
  89.             ret = av_append_packet(pb, pkt, 12);
  90.             if (ret < 0) {
  91.                 av_free_packet(pkt);
  92.                 return ret;
  93.             }
  94.         } else
  95.             first = 0;
  96.         frame_size = AV_RL32(pkt->data + pkt->size - 8);
  97.         if (frame_size > INT_MAX - 4) {
  98.             av_log(s, AV_LOG_ERROR, "Too large chunk size: %d\n", frame_size);
  99.             return AVERROR(EIO);
  100.         }
  101.         if (AV_RL32(pkt->data + pkt->size - 12) == MKTAG('E', 'O', 'F', 'R')) {
  102.             if (frame_size) {
  103.                 av_log(s, AV_LOG_WARNING, "skipping %d bytes of end-of-frame marker chunk\n",
  104.                        frame_size);
  105.                 avio_skip(pb, frame_size);
  106.             }
  107.             return 0;
  108.         }
  109.         ret = av_append_packet(pb, pkt, frame_size);
  110.         if (ret < 0) {
  111.             av_free_packet(pkt);
  112.             return ret;
  113.         }
  114.     }
  115.  
  116.     return 0;
  117. }
  118.  
  119. AVInputFormat ff_dfa_demuxer = {
  120.     .name           = "dfa",
  121.     .long_name      = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),
  122.     .read_probe     = dfa_probe,
  123.     .read_header    = dfa_read_header,
  124.     .read_packet    = dfa_read_packet,
  125.     .flags          = AVFMT_GENERIC_INDEX,
  126. };
  127.