mirror of https://git.ffmpeg.org/ffmpeg.git
119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
/*
|
|
* Chronomaster DFA Format Demuxer
|
|
* Copyright (c) 2011 Konstantin Shishkov
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
|
|
static int dfa_probe(AVProbeData *p)
|
|
{
|
|
if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('D', 'F', 'I', 'A'))
|
|
return 0;
|
|
|
|
return AVPROBE_SCORE_MAX;
|
|
}
|
|
|
|
static int dfa_read_header(AVFormatContext *s)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
AVStream *st;
|
|
int frames;
|
|
uint32_t mspf;
|
|
|
|
if (avio_rl32(pb) != MKTAG('D', 'F', 'I', 'A')) {
|
|
av_log(s, AV_LOG_ERROR, "Invalid magic for DFA\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
avio_skip(pb, 2); // unused
|
|
frames = avio_rl16(pb);
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_id = AV_CODEC_ID_DFA;
|
|
st->codec->width = avio_rl16(pb);
|
|
st->codec->height = avio_rl16(pb);
|
|
mspf = avio_rl32(pb);
|
|
if (!mspf) {
|
|
av_log(s, AV_LOG_WARNING, "Zero FPS reported, defaulting to 10\n");
|
|
mspf = 100;
|
|
}
|
|
avpriv_set_pts_info(st, 24, mspf, 1000);
|
|
avio_skip(pb, 128 - 16); // padding
|
|
st->duration = frames;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dfa_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
uint32_t frame_size;
|
|
int ret, first = 1;
|
|
|
|
if (pb->eof_reached)
|
|
return AVERROR_EOF;
|
|
|
|
if (av_get_packet(pb, pkt, 12) != 12)
|
|
return AVERROR(EIO);
|
|
while (!pb->eof_reached) {
|
|
if (!first) {
|
|
ret = av_append_packet(pb, pkt, 12);
|
|
if (ret < 0) {
|
|
av_free_packet(pkt);
|
|
return ret;
|
|
}
|
|
} else
|
|
first = 0;
|
|
frame_size = AV_RL32(pkt->data + pkt->size - 8);
|
|
if (frame_size > INT_MAX - 4) {
|
|
av_log(s, AV_LOG_ERROR, "Too large chunk size: %d\n", frame_size);
|
|
return AVERROR(EIO);
|
|
}
|
|
if (AV_RL32(pkt->data + pkt->size - 12) == MKTAG('E', 'O', 'F', 'R')) {
|
|
if (frame_size) {
|
|
av_log(s, AV_LOG_WARNING, "skipping %d bytes of end-of-frame marker chunk\n",
|
|
frame_size);
|
|
avio_skip(pb, frame_size);
|
|
}
|
|
return 0;
|
|
}
|
|
ret = av_append_packet(pb, pkt, frame_size);
|
|
if (ret < 0) {
|
|
av_free_packet(pkt);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_dfa_demuxer = {
|
|
.name = "dfa",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),
|
|
.read_probe = dfa_probe,
|
|
.read_header = dfa_read_header,
|
|
.read_packet = dfa_read_packet,
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
};
|