mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
b800327f4c
This commit does for AVInputFormat what commit59c9dc82f4did for AVOutputFormat: It adds a new type FFInputFormat, moves all the internals of AVInputFormat to it and adds a now reduced AVInputFormat as first member. This does not affect/improve extensibility of both public or private fields for demuxers (it is still a mess due to lavd). This is possible since50f34172e0(which removed the last usage of an internal field of AVInputFormat in fftools). (Hint: tools/probetest.c accesses the internals of FFInputFormat as well, but given that it is a testing tool this is not considered a problem.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
/*
|
|
* Copyright (c) 2010 David Conrad
|
|
*
|
|
* 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 "avformat.h"
|
|
#include "demux.h"
|
|
#include "internal.h"
|
|
#include "riff.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
static int probe(const AVProbeData *p)
|
|
{
|
|
if (AV_RL32(p->buf) == MKTAG('D','K','I','F')
|
|
&& !AV_RL16(p->buf+4) && AV_RL16(p->buf+6) == 32)
|
|
return AVPROBE_SCORE_MAX-2;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int read_header(AVFormatContext *s)
|
|
{
|
|
AVStream *st;
|
|
AVRational time_base;
|
|
|
|
avio_rl32(s->pb); // DKIF
|
|
avio_rl16(s->pb); // version
|
|
avio_rl16(s->pb); // header size
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codecpar->codec_tag = avio_rl32(s->pb);
|
|
st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, st->codecpar->codec_tag);
|
|
st->codecpar->width = avio_rl16(s->pb);
|
|
st->codecpar->height = avio_rl16(s->pb);
|
|
time_base.den = avio_rl32(s->pb);
|
|
time_base.num = avio_rl32(s->pb);
|
|
st->nb_frames = avio_rl32(s->pb);
|
|
avio_skip(s->pb, 4); // unused
|
|
|
|
// Infer duration from nb_frames, in order to be backward compatible with
|
|
// previous IVF demuxer.
|
|
// It is popular to configure time_base to 1/frame_rate by IVF muxer, that
|
|
// the duration happens to be the same with nb_frames. See
|
|
// `https://chromium.googlesource.com/webm/vp8-test-vectors/+/refs/heads/main`
|
|
st->duration = st->nb_frames;
|
|
|
|
ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS;
|
|
|
|
if (!time_base.den || !time_base.num) {
|
|
av_log(s, AV_LOG_ERROR, "Invalid frame rate\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
int ret, size = avio_rl32(s->pb);
|
|
int64_t pts = avio_rl64(s->pb);
|
|
|
|
ret = av_get_packet(s->pb, pkt, size);
|
|
pkt->stream_index = 0;
|
|
pkt->pts = pts;
|
|
pkt->pos -= 12;
|
|
|
|
return ret;
|
|
}
|
|
|
|
const FFInputFormat ff_ivf_demuxer = {
|
|
.p.name = "ivf",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("On2 IVF"),
|
|
.p.flags = AVFMT_GENERIC_INDEX,
|
|
.p.codec_tag = (const AVCodecTag* const []){ ff_codec_bmp_tags, 0 },
|
|
.read_probe = probe,
|
|
.read_header = read_header,
|
|
.read_packet = read_packet,
|
|
};
|