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
@@ -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
@@ -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;
new file mode 100644
@@ -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