[FFmpeg-devel] [PATCH 4/4] avformat: add ads demuxer

[Paul B Mahol]

Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
 libavformat/Makefile     |  1 +
 libavformat/ads.c        | 81 ++++++++++++++++++++++++++++++++++++++++++++++++
 libavformat/allformats.c |  1 +
 3 files changed, 83 insertions(+)
 create mode 100644 libavformat/ads.c

diff --git a/libavformat/Makefile b/libavformat/Makefile
index 9f477ac..c031afd 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -66,6 +66,7 @@ OBJS-$(CONFIG_AC3_MUXER)                 += rawenc.o
 OBJS-$(CONFIG_ACT_DEMUXER)               += act.o
 OBJS-$(CONFIG_ADF_DEMUXER)               += bintext.o sauce.o
 OBJS-$(CONFIG_ADP_DEMUXER)               += adp.o
+OBJS-$(CONFIG_ADS_DEMUXER)               += ads.o
 OBJS-$(CONFIG_ADX_DEMUXER)               += adxdec.o
 OBJS-$(CONFIG_ADX_MUXER)                 += rawenc.o
 OBJS-$(CONFIG_ADTS_MUXER)                += adtsenc.o apetag.o img2.o \
diff --git a/libavformat/ads.c b/libavformat/ads.c
new file mode 100644
index 0000000..d09f045
--- /dev/null
+++ b/libavformat/ads.c
@@ -0,0 +1,81 @@
+/*
+ * ADS/SS2 demuxer
+ * Copyright (c) 2015 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 "avformat.h"
+#include "internal.h"
+
+static int ads_probe(AVProbeData *p)
+{
+    if (memcmp(p->buf, "SShd", 4) &&
+        memcmp(p->buf+32, "SSbd", 4))
+        return 0;
+
+    return AVPROBE_SCORE_MAX / 3 * 2;
+}
+
+static int ads_read_header(AVFormatContext *s)
+{
+    AVStream *st;
+    int align;
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    avio_skip(s->pb, 12);
+    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_id    = AV_CODEC_ID_ADPCM_PSX;
+    st->codec->sample_rate = avio_rl32(s->pb);
+    if (st->codec->sample_rate <= 0)
+        return AVERROR_INVALIDDATA;
+    st->codec->channels    = avio_rl32(s->pb);
+    if (st->codec->channels <= 0)
+        return AVERROR_INVALIDDATA;
+    align                  = avio_rl32(s->pb);
+    if (align <= 0 || align > INT_MAX / st->codec->channels)
+        return AVERROR_INVALIDDATA;
+    st->codec->block_align = st->codec->channels * align;
+    avio_skip(s->pb, 12);
+    st->duration = (avio_rl32(s->pb) - 0x40) / 16 / st->codec->channels * 28;
+    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+
+    return 0;
+}
+
+static int ads_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    AVCodecContext *codec = s->streams[0]->codec;
+    int ret;
+
+    ret = av_get_packet(s->pb, pkt, codec->block_align);
+    pkt->stream_index = 0;
+    return ret;
+}
+
+AVInputFormat ff_ads_demuxer = {
+    .name           = "ads",
+    .long_name      = NULL_IF_CONFIG_SMALL("Sony ADS"),
+    .read_probe     = ads_probe,
+    .read_header    = ads_read_header,
+    .read_packet    = ads_read_packet,
+    .extensions     = "ads,ss2",
+};
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index f358b96..9c1dca8 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -66,6 +66,7 @@ void av_register_all(void)
     REGISTER_DEMUXER (ACT,              act);
     REGISTER_DEMUXER (ADF,              adf);
     REGISTER_DEMUXER (ADP,              adp);
+    REGISTER_DEMUXER (ADS,              ads);
     REGISTER_MUXER   (ADTS,             adts);
     REGISTER_MUXDEMUX(ADX,              adx);
     REGISTER_DEMUXER (AEA,              aea);
-- 
1.9.1