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118 lines
3.5 KiB
118 lines
3.5 KiB
/* |
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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 AVInputFormat ff_osq_demuxer = { |
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.name = "osq", |
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.long_name = NULL_IF_CONFIG_SMALL("raw OSQ"), |
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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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.extensions = "osq", |
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.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS, |
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.raw_codec_id = AV_CODEC_ID_OSQ, |
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.priv_data_size = sizeof(FFRawDemuxerContext), |
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.priv_class = &ff_raw_demuxer_class, |
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};
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