Add LOAS demuxer.

Changelog

@@ -43,6 +43,7 @@ easier to use. The changes are:
       '-preset <presetname>'.
     * -intra option was removed, it's equivalent to -g 0.
 - XMV demuxer
+- LOAS demuxer
 
 
 version 0.8:

doc/general.texi

@@ -120,6 +120,8 @@ library:
     @tab A format used by libvpx
 @item LMLM4                     @tab   @tab X
     @tab Used by Linux Media Labs MPEG-4 PCI boards
+@item LOAS                      @tab   @tab X
+    @tab contains LATM multiplexed AAC audio
 @item LXF                       @tab   @tab X
     @tab VR native stream format, used by Leitch/Harris' video servers.
 @item Matroska                  @tab X @tab X

libavformat/Makefile

@@ -113,6 +113,7 @@ OBJS-$(CONFIG_IVF_DEMUXER)               += ivfdec.o riff.o
 OBJS-$(CONFIG_IVF_MUXER)                 += ivfenc.o
 OBJS-$(CONFIG_JV_DEMUXER)                += jvdec.o
 OBJS-$(CONFIG_LMLM4_DEMUXER)             += lmlm4.o
+OBJS-$(CONFIG_LOAS_DEMUXER)              += loasdec.o
 OBJS-$(CONFIG_LXF_DEMUXER)               += lxfdec.o
 OBJS-$(CONFIG_M4V_DEMUXER)               += m4vdec.o rawdec.o
 OBJS-$(CONFIG_M4V_MUXER)                 += rawenc.o

libavformat/allformats.c

@@ -114,6 +114,7 @@ void av_register_all(void)
     REGISTER_MUXDEMUX (IVF, ivf);
     REGISTER_DEMUXER  (JV, jv);
     REGISTER_DEMUXER  (LMLM4, lmlm4);
+    REGISTER_DEMUXER  (LOAS, loas);
     REGISTER_DEMUXER  (LXF, lxf);
     REGISTER_MUXDEMUX (M4V, m4v);
     REGISTER_MUXER    (MD5, md5);

libavformat/loasdec.c

@@ -0,0 +1,88 @@
+/*
+ * LOAS AudioSyncStream demuxer
+ * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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 "libavutil/internal.h"
+#include "avformat.h"
+#include "rawdec.h"
+
+static int loas_probe(AVProbeData *p)
+{
+    int max_frames = 0, first_frames = 0;
+    int fsize, frames;
+    uint8_t *buf0 = p->buf;
+    uint8_t *buf2;
+    uint8_t *buf;
+    uint8_t *end = buf0 + p->buf_size - 3;
+    buf = buf0;
+
+    for(; buf < end; buf= buf2+1) {
+        buf2 = buf;
+
+        for(frames = 0; buf2 < end; frames++) {
+            uint32_t header = AV_RB24(buf2);
+            if((header >> 13) != 0x2B7)
+                break;
+            fsize = (header & 0x1FFF) + 3;
+            if(fsize < 7)
+                break;
+            fsize = FFMIN(fsize, end - buf2);
+            buf2 += fsize;
+        }
+        max_frames = FFMAX(max_frames, frames);
+        if(buf == buf0)
+            first_frames= frames;
+    }
+    if   (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
+    else if(max_frames>100)return AVPROBE_SCORE_MAX/2;
+    else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
+    else if(max_frames>=1) return 1;
+    else                   return 0;
+}
+
+static int loas_read_header(AVFormatContext *s,
+                            AVFormatParameters *ap)
+{
+    AVStream *st;
+
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_id = s->iformat->value;
+    st->need_parsing = AVSTREAM_PARSE_FULL;
+
+    //LCM of all possible AAC sample rates
+    av_set_pts_info(st, 64, 1, 28224000);
+
+    return 0;
+}
+
+AVInputFormat ff_loas_demuxer = {
+    .name           = "loas",
+    .long_name      = NULL_IF_CONFIG_SMALL("LOAS AudioSyncStream"),
+    .read_probe     = loas_probe,
+    .read_header    = loas_read_header,
+    .read_packet    = ff_raw_read_partial_packet,
+    .flags= AVFMT_GENERIC_INDEX,
+    .value = CODEC_ID_AAC_LATM,
+};

libavformat/version.h

@@ -24,7 +24,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFORMAT_VERSION_MAJOR 53
-#define LIBAVFORMAT_VERSION_MINOR  8
+#define LIBAVFORMAT_VERSION_MINOR  9
 #define LIBAVFORMAT_VERSION_MICRO  0
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \