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https://github.com/FFmpeg/FFmpeg.git
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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
/*
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* Copyright (c) 2010 David Conrad
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "demux.h"
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#include "internal.h"
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#include "riff.h"
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#include "libavutil/intreadwrite.h"
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static int probe(const AVProbeData *p)
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{
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if (AV_RL32(p->buf) == MKTAG('D','K','I','F')
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&& !AV_RL16(p->buf+4) && AV_RL16(p->buf+6) == 32)
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return AVPROBE_SCORE_MAX-2;
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return 0;
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}
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static int read_header(AVFormatContext *s)
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{
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AVStream *st;
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AVRational time_base;
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avio_rl32(s->pb); // DKIF
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avio_rl16(s->pb); // version
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avio_rl16(s->pb); // header size
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_tag = avio_rl32(s->pb);
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st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, st->codecpar->codec_tag);
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st->codecpar->width = avio_rl16(s->pb);
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st->codecpar->height = avio_rl16(s->pb);
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time_base.den = avio_rl32(s->pb);
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time_base.num = avio_rl32(s->pb);
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st->nb_frames = avio_rl32(s->pb);
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avio_skip(s->pb, 4); // unused
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// Infer duration from nb_frames, in order to be backward compatible with
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// previous IVF demuxer.
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// It is popular to configure time_base to 1/frame_rate by IVF muxer, that
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// the duration happens to be the same with nb_frames. See
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// `https://chromium.googlesource.com/webm/vp8-test-vectors/+/refs/heads/main`
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st->duration = st->nb_frames;
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ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS;
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if (!time_base.den || !time_base.num) {
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av_log(s, AV_LOG_ERROR, "Invalid frame rate\n");
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return AVERROR_INVALIDDATA;
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}
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avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
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return 0;
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}
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static int read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret, size = avio_rl32(s->pb);
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int64_t pts = avio_rl64(s->pb);
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ret = av_get_packet(s->pb, pkt, size);
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pkt->stream_index = 0;
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pkt->pts = pts;
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pkt->pos -= 12;
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return ret;
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}
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const FFInputFormat ff_ivf_demuxer = {
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.p.name = "ivf",
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.p.long_name = NULL_IF_CONFIG_SMALL("On2 IVF"),
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.p.flags = AVFMT_GENERIC_INDEX,
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.p.codec_tag = (const AVCodecTag* const []){ ff_codec_bmp_tags, 0 },
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.read_probe = probe,
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.read_header = read_header,
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.read_packet = read_packet,
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};
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