diff --git a/include/media/AudioTrack.h b/include/media/AudioTrack.h
index b106042..8f5e2d4 100644
--- a/include/media/AudioTrack.h
+++ b/include/media/AudioTrack.h
@@ -69,7 +69,8 @@
             MUTE    = 0x00000001
         };
         uint32_t    flags;
-        int         format;
+        audio_format_t format; // but AUDIO_FORMAT_PCM_8_BIT -> AUDIO_FORMAT_PCM_16_BIT
+        // accessed directly by WebKit ANP callback
         int         channelCount; // will be removed in the future, do not use
         size_t      frameCount;
         size_t      size;
@@ -143,7 +144,7 @@
 
                         AudioTrack( int streamType,
                                     uint32_t sampleRate  = 0,
-                                    int format           = 0,
+                                    audio_format_t format = AUDIO_FORMAT_DEFAULT,
                                     int channelMask      = 0,
                                     int frameCount       = 0,
                                     uint32_t flags       = 0,
@@ -163,7 +164,7 @@
 
                         AudioTrack( int streamType,
                                     uint32_t sampleRate = 0,
-                                    int format          = 0,
+                                    audio_format_t format = AUDIO_FORMAT_DEFAULT,
                                     int channelMask     = 0,
                                     const sp<IMemory>& sharedBuffer = 0,
                                     uint32_t flags      = 0,
@@ -187,7 +188,7 @@
      * */
             status_t    set(int streamType      =-1,
                             uint32_t sampleRate = 0,
-                            int format          = 0,
+                            audio_format_t format = AUDIO_FORMAT_DEFAULT,
                             int channelMask     = 0,
                             int frameCount      = 0,
                             uint32_t flags      = 0,
@@ -215,7 +216,7 @@
     /* getters, see constructor */
 
             int         streamType() const;
-            int         format() const;
+            audio_format_t format() const;
             int         channelCount() const;
             uint32_t    frameCount() const;
             int         frameSize() const;
@@ -434,7 +435,7 @@
             bool processAudioBuffer(const sp<AudioTrackThread>& thread);
             status_t createTrack_l(int streamType,
                                  uint32_t sampleRate,
-                                 uint32_t format,
+                                 audio_format_t format,
                                  uint32_t channelMask,
                                  int frameCount,
                                  uint32_t flags,
@@ -455,7 +456,7 @@
     uint32_t                mFrameCount;
 
     audio_track_cblk_t*     mCblk;
-    uint32_t                mFormat;
+    audio_format_t          mFormat;
     uint8_t                 mStreamType;
     uint8_t                 mChannelCount;
     uint8_t                 mMuted;
diff --git a/include/media/IMediaPlayerService.h b/include/media/IMediaPlayerService.h
index 93bbe13..4f46fcd 100644
--- a/include/media/IMediaPlayerService.h
+++ b/include/media/IMediaPlayerService.h
@@ -23,6 +23,7 @@
 #include <utils/String8.h>
 #include <binder/IInterface.h>
 #include <binder/Parcel.h>
+#include <system/audio.h>
 
 #include <media/IMediaPlayerClient.h>
 #include <media/IMediaPlayer.h>
@@ -43,8 +44,8 @@
     virtual sp<IMediaMetadataRetriever> createMetadataRetriever(pid_t pid) = 0;
     virtual sp<IMediaPlayer> create(pid_t pid, const sp<IMediaPlayerClient>& client, int audioSessionId = 0) = 0;
 
-    virtual sp<IMemory>         decode(const char* url, uint32_t *pSampleRate, int* pNumChannels, int* pFormat) = 0;
-    virtual sp<IMemory>         decode(int fd, int64_t offset, int64_t length, uint32_t *pSampleRate, int* pNumChannels, int* pFormat) = 0;
+    virtual sp<IMemory>         decode(const char* url, uint32_t *pSampleRate, int* pNumChannels, audio_format_t* pFormat) = 0;
+    virtual sp<IMemory>         decode(int fd, int64_t offset, int64_t length, uint32_t *pSampleRate, int* pNumChannels, audio_format_t* pFormat) = 0;
     virtual sp<IOMX>            getOMX() = 0;
 
     // codecs and audio devices usage tracking for the battery app
diff --git a/include/media/MediaPlayerInterface.h b/include/media/MediaPlayerInterface.h
index 80f43a3..1f6bdda 100644
--- a/include/media/MediaPlayerInterface.h
+++ b/include/media/MediaPlayerInterface.h
@@ -85,7 +85,7 @@
         // audio data.
         virtual status_t    open(
                 uint32_t sampleRate, int channelCount,
-                int format=AUDIO_FORMAT_PCM_16_BIT,
+                audio_format_t format=AUDIO_FORMAT_PCM_16_BIT,
                 int bufferCount=DEFAULT_AUDIOSINK_BUFFERCOUNT,
                 AudioCallback cb = NULL,
                 void *cookie = NULL) = 0;
diff --git a/include/media/mediaplayer.h b/include/media/mediaplayer.h
index e6a0cc5..2dc055e 100644
--- a/include/media/mediaplayer.h
+++ b/include/media/mediaplayer.h
@@ -190,8 +190,8 @@
             bool            isLooping();
             status_t        setVolume(float leftVolume, float rightVolume);
             void            notify(int msg, int ext1, int ext2, const Parcel *obj = NULL);
-    static  sp<IMemory>     decode(const char* url, uint32_t *pSampleRate, int* pNumChannels, int* pFormat);
-    static  sp<IMemory>     decode(int fd, int64_t offset, int64_t length, uint32_t *pSampleRate, int* pNumChannels, int* pFormat);
+    static  sp<IMemory>     decode(const char* url, uint32_t *pSampleRate, int* pNumChannels, audio_format_t* pFormat);
+    static  sp<IMemory>     decode(int fd, int64_t offset, int64_t length, uint32_t *pSampleRate, int* pNumChannels, audio_format_t* pFormat);
             status_t        invoke(const Parcel& request, Parcel *reply);
             status_t        setMetadataFilter(const Parcel& filter);
             status_t        getMetadata(bool update_only, bool apply_filter, Parcel *metadata);