| /* |
| * OSQ demuxer |
| * Copyright (c) 2023 Paul B Mahol |
| * |
| * 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 "libavutil/intreadwrite.h" |
| #include "avio_internal.h" |
| #include "avformat.h" |
| #include "demux.h" |
| #include "internal.h" |
| #include "rawdec.h" |
| |
| static int osq_probe(const AVProbeData *p) |
| { |
| if (AV_RL32(p->buf) != MKTAG('O','S','Q',' ')) |
| return 0; |
| if (AV_RL32(p->buf + 4) != 48) |
| return 0; |
| if (AV_RL16(p->buf + 8) != 1) |
| return 0; |
| if (p->buf[10] == 0) |
| return 0; |
| if (p->buf[11] == 0) |
| return 0; |
| if (AV_RL32(p->buf + 12) == 0) |
| return 0; |
| if (AV_RL16(p->buf + 16) == 0) |
| return 0; |
| |
| return AVPROBE_SCORE_MAX; |
| } |
| |
| static int osq_read_header(AVFormatContext *s) |
| { |
| uint32_t t, size; |
| AVStream *st; |
| int ret; |
| |
| t = avio_rl32(s->pb); |
| if (t != MKTAG('O','S','Q',' ')) |
| return AVERROR_INVALIDDATA; |
| |
| size = avio_rl32(s->pb); |
| if (size != 48) |
| return AVERROR_INVALIDDATA; |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| if ((ret = ff_get_extradata(s, st->codecpar, s->pb, size)) < 0) |
| return ret; |
| |
| t = avio_rl32(s->pb); |
| if (t != MKTAG('R','I','F','F')) |
| return AVERROR_INVALIDDATA; |
| avio_skip(s->pb, 8); |
| |
| t = avio_rl32(s->pb); |
| if (t != MKTAG('f','m','t',' ')) |
| return AVERROR_INVALIDDATA; |
| size = avio_rl32(s->pb); |
| avio_skip(s->pb, size); |
| |
| t = avio_rl32(s->pb); |
| size = avio_rl32(s->pb); |
| while (t != MKTAG('d','a','t','a')) { |
| avio_skip(s->pb, size); |
| |
| t = avio_rl32(s->pb); |
| size = avio_rl32(s->pb); |
| if (avio_feof(s->pb)) |
| return AVERROR_INVALIDDATA; |
| } |
| |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codecpar->codec_id = AV_CODEC_ID_OSQ; |
| st->codecpar->sample_rate = AV_RL32(st->codecpar->extradata + 4); |
| if (st->codecpar->sample_rate <= 0) |
| return AVERROR_INVALIDDATA; |
| st->codecpar->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC; |
| st->codecpar->ch_layout.nb_channels = st->codecpar->extradata[3]; |
| if (st->codecpar->ch_layout.nb_channels == 0) |
| return AVERROR_INVALIDDATA; |
| st->start_time = 0; |
| st->duration = AV_RL32(st->codecpar->extradata + 16); |
| avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
| |
| return 0; |
| } |
| |
| const FFInputFormat ff_osq_demuxer = { |
| .p.name = "osq", |
| .p.long_name = NULL_IF_CONFIG_SMALL("raw OSQ"), |
| .p.extensions = "osq", |
| .p.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS, |
| .p.priv_class = &ff_raw_demuxer_class, |
| .read_probe = osq_probe, |
| .read_header = osq_read_header, |
| .read_packet = ff_raw_read_partial_packet, |
| .raw_codec_id = AV_CODEC_ID_OSQ, |
| .priv_data_size = sizeof(FFRawDemuxerContext), |
| }; |