avformat: add OSQ demuxer

1 files changed, 118 insertions, 0 deletions

diff --git a/libavformat/osq.c b/libavformat/osq.c
new file mode 100644
index 0000000000..c5a63d3398
--- /dev/null
+++ b/libavformat/osq.c
@@ -0,0 +1,118 @@
+/*
+ * 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 AVInputFormat ff_osq_demuxer = {
+    .name           = "osq",
+    .long_name      = NULL_IF_CONFIG_SMALL("raw OSQ"),
+    .read_probe     = osq_probe,
+    .read_header    = osq_read_header,
+    .read_packet    = ff_raw_read_partial_packet,
+    .extensions     = "osq",
+    .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
+    .raw_codec_id   = AV_CODEC_ID_OSQ,
+    .priv_data_size = sizeof(FFRawDemuxerContext),
+    .priv_class     = &ff_raw_demuxer_class,
+};