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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 <inttypes.h>
  23.  
  24. #include "libavutil/intreadwrite.h"
  25. #include "avformat.h"
  26. #include "internal.h"
  27.  
  28. static int dfa_probe(AVProbeData *p)
  29. {
  30.     if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('D', 'F', 'I', 'A'))
  31.         return 0;
  32.  
  33.     if (AV_RL32(p->buf + 16) != 0x80)
  34.         return AVPROBE_SCORE_MAX / 4;
  35.  
  36.     return AVPROBE_SCORE_MAX;
  37. }
  38.  
  39. static int dfa_read_header(AVFormatContext *s)
  40. {
  41.     AVIOContext *pb = s->pb;
  42.     AVStream *st;
  43.     int frames;
  44.     int version;
  45.     uint32_t mspf;
  46.  
  47.     if (avio_rl32(pb) != MKTAG('D', 'F', 'I', 'A')) {
  48.         av_log(s, AV_LOG_ERROR, "Invalid magic for DFA\n");
  49.         return AVERROR_INVALIDDATA;
  50.     }
  51.  
  52.     version = avio_rl16(pb);
  53.     frames = avio_rl16(pb);
  54.  
  55.     st = avformat_new_stream(s, NULL);
  56.     if (!st)
  57.         return AVERROR(ENOMEM);
  58.  
  59.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  60.     st->codec->codec_id   = AV_CODEC_ID_DFA;
  61.     st->codec->width      = avio_rl16(pb);
  62.     st->codec->height     = avio_rl16(pb);
  63.     mspf = avio_rl32(pb);
  64.     if (!mspf) {
  65.         av_log(s, AV_LOG_WARNING, "Zero FPS reported, defaulting to 10\n");
  66.         mspf = 100;
  67.     }
  68.     avpriv_set_pts_info(st, 24, mspf, 1000);
  69.     avio_skip(pb, 128 - 16); // padding
  70.     st->duration = frames;
  71.  
  72.     if (ff_alloc_extradata(st->codec, 2))
  73.         return AVERROR(ENOMEM);
  74.     AV_WL16(st->codec->extradata, version);
  75.     if (version == 0x100)
  76.         st->sample_aspect_ratio = (AVRational){2, 1};
  77.  
  78.     return 0;
  79. }
  80.  
  81. static int dfa_read_packet(AVFormatContext *s, AVPacket *pkt)
  82. {
  83.     AVIOContext *pb = s->pb;
  84.     uint32_t frame_size;
  85.     int ret, first = 1;
  86.  
  87.     if (avio_feof(pb))
  88.         return AVERROR_EOF;
  89.  
  90.     if (av_get_packet(pb, pkt, 12) != 12)
  91.         return AVERROR(EIO);
  92.     while (!avio_feof(pb)) {
  93.         if (!first) {
  94.             ret = av_append_packet(pb, pkt, 12);
  95.             if (ret < 0) {
  96.                 av_free_packet(pkt);
  97.                 return ret;
  98.             }
  99.         } else
  100.             first = 0;
  101.         frame_size = AV_RL32(pkt->data + pkt->size - 8);
  102.         if (frame_size > INT_MAX - 4) {
  103.             av_log(s, AV_LOG_ERROR, "Too large chunk size: %"PRIu32"\n", frame_size);
  104.             return AVERROR(EIO);
  105.         }
  106.         if (AV_RL32(pkt->data + pkt->size - 12) == MKTAG('E', 'O', 'F', 'R')) {
  107.             if (frame_size) {
  108.                 av_log(s, AV_LOG_WARNING,
  109.                        "skipping %"PRIu32" bytes of end-of-frame marker chunk\n",
  110.                        frame_size);
  111.                 avio_skip(pb, frame_size);
  112.             }
  113.             return 0;
  114.         }
  115.         ret = av_append_packet(pb, pkt, frame_size);
  116.         if (ret < 0) {
  117.             av_free_packet(pkt);
  118.             return ret;
  119.         }
  120.     }
  121.  
  122.     return 0;
  123. }
  124.  
  125. AVInputFormat ff_dfa_demuxer = {
  126.     .name           = "dfa",
  127.     .long_name      = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),
  128.     .read_probe     = dfa_probe,
  129.     .read_header    = dfa_read_header,
  130.     .read_packet    = dfa_read_packet,
  131.     .flags          = AVFMT_GENERIC_INDEX,
  132. };
  133.