Add support for multichannel ATRAC3+ streams.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavformat/oma.c

@@ -21,6 +21,7 @@
 #include "internal.h"
 #include "oma.h"
 #include "libavcodec/avcodec.h"
+#include "libavutil/channel_layout.h"
 
 const uint16_t ff_oma_srate_tab[8] = { 320, 441, 480, 882, 960, 0 };
 
@@ -31,3 +32,17 @@ const AVCodecTag ff_oma_codec_tags[] = {
     { AV_CODEC_ID_PCM_S16BE,   OMA_CODECID_LPCM    },
     { 0 },
 };
+
+/** map ATRAC-X channel id to internal channel layout */
+const uint64_t ff_oma_chid_to_native_layout[7] = {
+    AV_CH_LAYOUT_MONO,
+    AV_CH_LAYOUT_STEREO,
+    AV_CH_LAYOUT_SURROUND,
+    AV_CH_LAYOUT_4POINT0,
+    AV_CH_LAYOUT_5POINT1_BACK,
+    AV_CH_LAYOUT_6POINT1_BACK,
+    AV_CH_LAYOUT_7POINT1
+};
+
+/** map ATRAC-X channel id to total number of channels */
+const int ff_oma_chid_to_num_channels[7] = {1, 2, 3, 4, 6, 7, 8};

libavformat/oma.h

@@ -41,4 +41,7 @@ extern const uint16_t ff_oma_srate_tab[8];
 
 extern const AVCodecTag ff_oma_codec_tags[];
 
+extern const uint64_t ff_oma_chid_to_native_layout[7];
+extern const int ff_oma_chid_to_num_channels[7];
+
 #endif /* AVFORMAT_OMA_H */

libavformat/omadec.c

 /*
  * Sony OpenMG (OMA) demuxer
  *
- * Copyright (c) 2008 Maxim Poliakovski
+ * Copyright (c) 2008, 2013 Maxim Poliakovski
  *               2008 Benjamin Larsson
  *               2011 David Goldwich
  *
@@ -284,7 +284,7 @@ static int decrypt_init(AVFormatContext *s, ID3v2ExtraMeta *em, uint8_t *header)
 static int oma_read_header(AVFormatContext *s)
 {
     int     ret, framesize, jsflag, samplerate;
-    uint32_t codec_params;
+    uint32_t codec_params, channel_id;
     int16_t eid;
     uint8_t buf[EA3_HEADER_SIZE];
     uint8_t *edata;
@@ -364,7 +364,14 @@ static int oma_read_header(AVFormatContext *s)
         avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
         break;
     case OMA_CODECID_ATRAC3P:
-        st->codec->channels = (codec_params >> 10) & 7;
+        channel_id = (codec_params >> 10) & 7;
+        if (!channel_id) {
+            av_log(s, AV_LOG_ERROR,
+                   "Invalid ATRAC-X channel id: %d\n", channel_id);
+            return AVERROR_INVALIDDATA;
+        }
+        st->codec->channel_layout = ff_oma_chid_to_native_layout[channel_id - 1];
+        st->codec->channels       = ff_oma_chid_to_num_channels[channel_id - 1];
         framesize = ((codec_params & 0x3FF) * 8) + 8;
         samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
         if (!samplerate) {