avformat: add svag demuxer

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Changelog

@@ -19,6 +19,8 @@ version <next>:
 - displace filter
 - selectivecolor filter
 - extensive native AAC encoder improvements
+- ADPCM PSX decoder
+- genh, vag, ads & svag demuxer
 
 
 version 2.8:

libavformat/Makefile

@@ -426,6 +426,7 @@ OBJS-$(CONFIG_STR_DEMUXER)               += psxstr.o
 OBJS-$(CONFIG_SUBVIEWER1_DEMUXER)        += subviewer1dec.o subtitles.o
 OBJS-$(CONFIG_SUBVIEWER_DEMUXER)         += subviewerdec.o subtitles.o
 OBJS-$(CONFIG_SUP_DEMUXER)               += supdec.o
+OBJS-$(CONFIG_SVAG_DEMUXER)              += svag.o
 OBJS-$(CONFIG_SWF_DEMUXER)               += swfdec.o swf.o
 OBJS-$(CONFIG_SWF_MUXER)                 += swfenc.o swf.o
 OBJS-$(CONFIG_TAK_DEMUXER)               += takdec.o apetag.o img2.o rawdec.o

libavformat/allformats.c

@@ -294,6 +294,7 @@ void av_register_all(void)
     REGISTER_DEMUXER (SUBVIEWER1,       subviewer1);
     REGISTER_DEMUXER (SUBVIEWER,        subviewer);
     REGISTER_DEMUXER (SUP,              sup);
+    REGISTER_DEMUXER (SVAG,             svag);
     REGISTER_MUXDEMUX(SWF,              swf);
     REGISTER_DEMUXER (TAK,              tak);
     REGISTER_MUXER   (TEE,              tee);

libavformat/svag.c

@@ -0,0 +1,78 @@
+/*
+ * SVAG 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 "avformat.h"
+#include "internal.h"
+
+static int svag_probe(AVProbeData *p)
+{
+    if (memcmp(p->buf, "Svag", 4))
+        return 0;
+
+    return AVPROBE_SCORE_MAX;
+}
+
+static int svag_read_header(AVFormatContext *s)
+{
+    unsigned size, align;
+    AVStream *st;
+
+    avio_skip(s->pb, 4);
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    size                   = avio_rl32(s->pb);
+    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;
+    st->duration           = size / (16 * st->codec->channels) * 28;
+    align                  = avio_rl32(s->pb);
+    if (align <= 0 || align > INT_MAX / st->codec->channels)
+        return AVERROR_INVALIDDATA;
+    st->codec->block_align = align * st->codec->channels;
+    avio_skip(s->pb, 0x800 - avio_tell(s->pb));
+    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+
+    return 0;
+}
+
+static int svag_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    AVCodecContext *codec = s->streams[0]->codec;
+
+    return av_get_packet(s->pb, pkt, codec->block_align);
+}
+
+AVInputFormat ff_svag_demuxer = {
+    .name           = "svag",
+    .long_name      = NULL_IF_CONFIG_SMALL("SVAG"),
+    .read_probe     = svag_probe,
+    .read_header    = svag_read_header,
+    .read_packet    = svag_read_packet,
+    .extensions     = "svag",
+};

libavformat/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFORMAT_VERSION_MAJOR  57
-#define LIBAVFORMAT_VERSION_MINOR   7
+#define LIBAVFORMAT_VERSION_MINOR   8
 #define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \