mirror of https://git.videolan.org/git/ffmpeg.git
119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
/*
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* OSQ demuxer
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* Copyright (c) 2023 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/intreadwrite.h"
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#include "avio_internal.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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#include "rawdec.h"
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static int osq_probe(const AVProbeData *p)
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{
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if (AV_RL32(p->buf) != MKTAG('O','S','Q',' '))
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return 0;
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if (AV_RL32(p->buf + 4) != 48)
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return 0;
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if (AV_RL16(p->buf + 8) != 1)
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return 0;
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if (p->buf[10] == 0)
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return 0;
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if (p->buf[11] == 0)
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return 0;
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if (AV_RL32(p->buf + 12) == 0)
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return 0;
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if (AV_RL16(p->buf + 16) == 0)
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int osq_read_header(AVFormatContext *s)
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{
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uint32_t t, size;
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AVStream *st;
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int ret;
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t = avio_rl32(s->pb);
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if (t != MKTAG('O','S','Q',' '))
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return AVERROR_INVALIDDATA;
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size = avio_rl32(s->pb);
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if (size != 48)
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return AVERROR_INVALIDDATA;
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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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if ((ret = ff_get_extradata(s, st->codecpar, s->pb, size)) < 0)
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return ret;
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t = avio_rl32(s->pb);
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if (t != MKTAG('R','I','F','F'))
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, 8);
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t = avio_rl32(s->pb);
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if (t != MKTAG('f','m','t',' '))
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return AVERROR_INVALIDDATA;
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size = avio_rl32(s->pb);
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avio_skip(s->pb, size);
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t = avio_rl32(s->pb);
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size = avio_rl32(s->pb);
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while (t != MKTAG('d','a','t','a')) {
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avio_skip(s->pb, size);
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t = avio_rl32(s->pb);
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size = avio_rl32(s->pb);
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if (avio_feof(s->pb))
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return AVERROR_INVALIDDATA;
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}
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_OSQ;
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st->codecpar->sample_rate = AV_RL32(st->codecpar->extradata + 4);
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if (st->codecpar->sample_rate <= 0)
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return AVERROR_INVALIDDATA;
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st->codecpar->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
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st->codecpar->ch_layout.nb_channels = st->codecpar->extradata[3];
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if (st->codecpar->ch_layout.nb_channels == 0)
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return AVERROR_INVALIDDATA;
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st->start_time = 0;
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st->duration = AV_RL32(st->codecpar->extradata + 16);
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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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const FFInputFormat ff_osq_demuxer = {
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.p.name = "osq",
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.p.long_name = NULL_IF_CONFIG_SMALL("raw OSQ"),
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.p.extensions = "osq",
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.p.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
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.p.priv_class = &ff_raw_demuxer_class,
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.read_probe = osq_probe,
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.read_header = osq_read_header,
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.read_packet = ff_raw_read_partial_packet,
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.raw_codec_id = AV_CODEC_ID_OSQ,
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.priv_data_size = sizeof(FFRawDemuxerContext),
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};
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