[FFmpeg-devel] [PATCH] avformat: add SDNS demuxer

[FFmpeg-devel] [PATCH] avformat: add SDNS demuxer

[Paul B Mahol]

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Patch attached.

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From f98e8a2931327c0b45aa7183d4ae3bd780382806 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Fri, 27 Jan 2023 17:00:36 +0100
Subject: [PATCH] avformat: add SDNS demuxer

Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
 libavformat/Makefile     |  1 +
 libavformat/allformats.c |  1 +
 libavformat/sdns.c       | 96 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 98 insertions(+)
 create mode 100644 libavformat/sdns.c

diff --git a/libavformat/Makefile b/libavformat/Makefile
index 89dbde9454..b5bf549eb7 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -523,6 +523,7 @@ OBJS-$(CONFIG_SBG_DEMUXER)               += sbgdec.o
 OBJS-$(CONFIG_SCC_DEMUXER)               += sccdec.o subtitles.o
 OBJS-$(CONFIG_SCC_MUXER)                 += sccenc.o
 OBJS-$(CONFIG_SCD_DEMUXER)               += scd.o
+OBJS-$(CONFIG_SDNS_DEMUXER)              += sdns.o
 OBJS-$(CONFIG_SDP_DEMUXER)               += rtsp.o
 OBJS-$(CONFIG_SDR2_DEMUXER)              += sdr2.o
 OBJS-$(CONFIG_SDS_DEMUXER)               += sdsdec.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index b5a3d909bd..9ca8d2692f 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -404,6 +404,7 @@ extern const AVInputFormat  ff_sbg_demuxer;
 extern const AVInputFormat  ff_scc_demuxer;
 extern const AVOutputFormat ff_scc_muxer;
 extern const AVInputFormat  ff_scd_demuxer;
+extern const AVInputFormat  ff_sdns_demuxer;
 extern const AVInputFormat  ff_sdp_demuxer;
 extern const AVInputFormat  ff_sdr2_demuxer;
 extern const AVInputFormat  ff_sds_demuxer;
diff --git a/libavformat/sdns.c b/libavformat/sdns.c
new file mode 100644
index 0000000000..f00c6bcc49
--- /dev/null
+++ b/libavformat/sdns.c
@@ -0,0 +1,96 @@
+/*
+ * SDNS 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/channel_layout.h"
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "demux.h"
+#include "internal.h"
+
+static int sdns_probe(const AVProbeData *p)
+{
+    if (AV_RL32(p->buf) != MKTAG('S','D','N','S'))
+        return 0;
+    if (AV_RB32(p->buf + 8) <= 0)
+        return 0;
+    if (AV_RB32(p->buf + 12) <= 0 ||
+        AV_RB32(p->buf + 12) > 128)
+        return 0;
+    return AVPROBE_SCORE_MAX / 3;
+}
+
+static int sdns_read_header(AVFormatContext *s)
+{
+    AVIOContext *pb = s->pb;
+    AVCodecParameters *par;
+    int channels, ret;
+    AVStream *st;
+
+    avio_skip(pb, 8);
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    par              = st->codecpar;
+    par->codec_type  = AVMEDIA_TYPE_AUDIO;
+    par->codec_id    = AV_CODEC_ID_XMA1;
+    par->sample_rate = avio_rb32(pb);
+    channels         = avio_rb32(pb);
+    if (channels <= 0 || channels > 128)
+        return AVERROR_INVALIDDATA;
+    av_channel_layout_default(&par->ch_layout, channels);
+    if (par->sample_rate <= 0)
+        return AVERROR_INVALIDDATA;
+    par->block_align = 2048;
+    if ((ret = ff_alloc_extradata(par, 8 + 20 * ((channels + 1) / 2))) < 0)
+        return ret;
+    memset(par->extradata, 0, 28);
+    par->extradata[4] = (channels + 1) / 2;
+    for (int i = 0; i < par->extradata[4]; i++)
+        par->extradata[8 + 20 * i + 17] = FFMIN(2, channels - i * 2);
+    avpriv_set_pts_info(st, 64, 1, par->sample_rate);
+    avio_seek(pb, 0x1000, SEEK_SET);
+
+    return 0;
+}
+
+static int sdns_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    int ret;
+
+    if (avio_feof(s->pb))
+        return AVERROR_EOF;
+    ret = av_get_packet(s->pb, pkt, 2048);
+    pkt->stream_index = 0;
+
+    return ret;
+}
+
+const AVInputFormat ff_sdns_demuxer = {
+    .name           = "sdns",
+    .long_name      = NULL_IF_CONFIG_SMALL("Xbox SDNS"),
+    .read_probe     = sdns_probe,
+    .read_header    = sdns_read_header,
+    .read_packet    = sdns_read_packet,
+    .flags          = AVFMT_GENERIC_INDEX,
+    .extensions     = "sdns",
+};
-- 
2.39.1


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