diff --git a/doc/APIchanges b/doc/APIchanges
index 2720a58fcd..65fd599c45 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -15,6 +15,10 @@ libavutil:     2014-08-09
 
 API changes, most recent first:
 
+2015-01-xx - xxxxxxx - lavc 56.12.0, lavu 54.8.0 - avcodec.h, frame.h
+  Add AV_PKT_DATA_AUDIO_SERVICE_TYPE and AV_FRAME_DATA_AUDIO_SERVICE_TYPE for
+  storing the audio service type as side data.
+
 2015-01-11 - 007c33d - lavd 56.4.100 - avdevice.h
   Add avdevice_list_input_sources().
   Add avdevice_list_output_sinks().
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 5c21430ba1..87b53a2840 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -1031,6 +1031,12 @@ enum AVPacketSideDataType {
      */
     AV_PKT_DATA_STEREO3D,
 
+    /**
+     * This side data should be associated with an audio stream and corresponds
+     * to enum AVAudioServiceType.
+     */
+    AV_PKT_DATA_AUDIO_SERVICE_TYPE,
+
     /**
      * Recommmends skipping the specified number of samples
      * @code
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index e18ed2d751..df4f6e68ae 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -746,6 +746,7 @@ int ff_init_buffer_info(AVCodecContext *avctx, AVFrame *frame)
         { AV_PKT_DATA_REPLAYGAIN ,   AV_FRAME_DATA_REPLAYGAIN },
         { AV_PKT_DATA_DISPLAYMATRIX, AV_FRAME_DATA_DISPLAYMATRIX },
         { AV_PKT_DATA_STEREO3D,      AV_FRAME_DATA_STEREO3D },
+        { AV_PKT_DATA_AUDIO_SERVICE_TYPE, AV_FRAME_DATA_AUDIO_SERVICE_TYPE },
     };
 
     if (pkt) {
diff --git a/libavcodec/version.h b/libavcodec/version.h
index eafa12d43c..dfb95e098f 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -29,7 +29,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVCODEC_VERSION_MAJOR 56
-#define LIBAVCODEC_VERSION_MINOR  20
+#define LIBAVCODEC_VERSION_MINOR  21
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
diff --git a/libavfilter/af_ashowinfo.c b/libavfilter/af_ashowinfo.c
index 0e6c6c06f5..26e4f1ff95 100644
--- a/libavfilter/af_ashowinfo.c
+++ b/libavfilter/af_ashowinfo.c
@@ -142,6 +142,30 @@ static void dump_replaygain(AVFilterContext *ctx, AVFrameSideData *sd)
     print_peak(ctx, "album peak", rg->album_peak);
 }
 
+static void dump_audio_service_type(AVFilterContext *ctx, AVFrameSideData *sd)
+{
+    enum AVAudioServiceType *ast;
+
+    av_log(ctx, AV_LOG_INFO, "audio service type: ");
+    if (sd->size < sizeof(*ast)) {
+        av_log(ctx, AV_LOG_INFO, "invalid data");
+        return;
+    }
+    ast = (enum AVAudioServiceType*)sd->data;
+    switch (*ast) {
+    case AV_AUDIO_SERVICE_TYPE_MAIN:              av_log(ctx, AV_LOG_INFO, "Main Audio Service"); break;
+    case AV_AUDIO_SERVICE_TYPE_EFFECTS:           av_log(ctx, AV_LOG_INFO, "Effects");            break;
+    case AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED: av_log(ctx, AV_LOG_INFO, "Visually Impaired");  break;
+    case AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED:  av_log(ctx, AV_LOG_INFO, "Hearing Impaired");   break;
+    case AV_AUDIO_SERVICE_TYPE_DIALOGUE:          av_log(ctx, AV_LOG_INFO, "Dialogue");           break;
+    case AV_AUDIO_SERVICE_TYPE_COMMENTARY:        av_log(ctx, AV_LOG_INFO, "Commentary");         break;
+    case AV_AUDIO_SERVICE_TYPE_EMERGENCY:         av_log(ctx, AV_LOG_INFO, "Emergency");          break;
+    case AV_AUDIO_SERVICE_TYPE_VOICE_OVER:        av_log(ctx, AV_LOG_INFO, "Voice Over");         break;
+    case AV_AUDIO_SERVICE_TYPE_KARAOKE:           av_log(ctx, AV_LOG_INFO, "Karaoke");            break;
+    default:                                      av_log(ctx, AV_LOG_INFO, "unknown");            break;
+    }
+}
+
 static void dump_unknown(AVFilterContext *ctx, AVFrameSideData *sd)
 {
     av_log(ctx, AV_LOG_INFO, "unknown side data type: %d, size %d bytes", sd->type, sd->size);
@@ -200,6 +224,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
         case AV_FRAME_DATA_MATRIXENCODING: dump_matrixenc (ctx, sd); break;
         case AV_FRAME_DATA_DOWNMIX_INFO:   dump_downmix   (ctx, sd); break;
         case AV_FRAME_DATA_REPLAYGAIN:     dump_replaygain(ctx, sd); break;
+        case AV_FRAME_DATA_AUDIO_SERVICE_TYPE: dump_audio_service_type(ctx, sd); break;
         default:                           dump_unknown   (ctx, sd); break;
         }
 
diff --git a/libavutil/frame.h b/libavutil/frame.h
index d335bee831..1e296521ff 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -106,6 +106,12 @@ enum AVFrameSideDataType {
      * @endcode
      */
     AV_FRAME_DATA_SKIP_SAMPLES,
+
+    /**
+     * This side data must be associated with an audio frame and corresponds to
+     * enum AVAudioServiceType defined in avcodec.h.
+     */
+    AV_FRAME_DATA_AUDIO_SERVICE_TYPE,
 };
 
 enum AVActiveFormatDescription {
diff --git a/libavutil/version.h b/libavutil/version.h
index 8be61e356f..053bd990d1 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -56,7 +56,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  54
-#define LIBAVUTIL_VERSION_MINOR  17
+#define LIBAVUTIL_VERSION_MINOR  18
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \