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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>
85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/*
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* VAG demuxer
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* Copyright (c) 2015 Paul B Mahol
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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 "libavutil/channel_layout.h"
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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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static int vag_probe(const AVProbeData *p)
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{
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if (memcmp(p->buf, "VAGp\0\0\0", 7))
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int vag_read_header(AVFormatContext *s)
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{
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AVStream *st;
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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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avio_skip(s->pb, 4);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
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st->codecpar->ch_layout.nb_channels = 1 + (avio_rb32(s->pb) == 0x00000004);
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avio_skip(s->pb, 4);
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if (st->codecpar->ch_layout.nb_channels > 1) {
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st->duration = avio_rb32(s->pb);
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} else {
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st->duration = avio_rb32(s->pb) / 16 * 28;
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}
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st->codecpar->sample_rate = avio_rb32(s->pb);
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if (st->codecpar->sample_rate <= 0)
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return AVERROR_INVALIDDATA;
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avio_seek(s->pb, 0x1000, SEEK_SET);
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if (avio_rl32(s->pb) == MKTAG('V','A','G','p')) {
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st->codecpar->block_align = 0x1000 * st->codecpar->ch_layout.nb_channels;
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avio_seek(s->pb, 0, SEEK_SET);
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st->duration = st->duration / 16 * 28;
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} else {
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st->codecpar->block_align = 16 * st->codecpar->ch_layout.nb_channels;
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avio_seek(s->pb, st->codecpar->ch_layout.nb_channels > 1 ? 0x80 : 0x30, SEEK_SET);
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}
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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return 0;
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}
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static int vag_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVCodecParameters *par = s->streams[0]->codecpar;
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return av_get_packet(s->pb, pkt, par->block_align);
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}
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const FFInputFormat ff_vag_demuxer = {
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.p.name = "vag",
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.p.long_name = NULL_IF_CONFIG_SMALL("Sony PS2 VAG"),
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.p.extensions = "vag",
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.read_probe = vag_probe,
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.read_header = vag_read_header,
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.read_packet = vag_read_packet,
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};
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