diff --git a/include/media/IMediaPlayerService.h b/include/media/IMediaPlayerService.h
index 0bfb166..cce9129 100644
--- a/include/media/IMediaPlayerService.h
+++ b/include/media/IMediaPlayerService.h
@@ -54,6 +54,22 @@
     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<IOMX>            getOMX() = 0;
+
+    // codecs usage tracking for the battery app
+    enum BatteryDataBits {
+        // tracking audio codec
+        kBatteryDataTrackAudio          = 1,
+        // tracking video codec
+        kBatteryDataTrackVideo          = 2,
+        // codec is started, otherwise codec is paused
+        kBatteryDataCodecStarted        = 4,
+        // tracking decoder (for media player),
+        // otherwise tracking encoder (for media recorder)
+        kBatteryDataTrackDecoder        = 8,
+    };
+
+    virtual void addBatteryData(uint32_t params) = 0;
+    virtual status_t pullBatteryData(Parcel* reply) = 0;
 };
 
 // ----------------------------------------------------------------------------
diff --git a/media/libmedia/IMediaPlayerService.cpp b/media/libmedia/IMediaPlayerService.cpp
index 77199e1..17a0362 100644
--- a/media/libmedia/IMediaPlayerService.cpp
+++ b/media/libmedia/IMediaPlayerService.cpp
@@ -37,7 +37,9 @@
     DECODE_FD,
     CREATE_MEDIA_RECORDER,
     CREATE_METADATA_RETRIEVER,
-    GET_OMX
+    GET_OMX,
+    ADD_BATTERY_DATA,
+    PULL_BATTERY_DATA
 };
 
 class BpMediaPlayerService: public BpInterface<IMediaPlayerService>
@@ -156,6 +158,19 @@
         remote()->transact(GET_OMX, data, &reply);
         return interface_cast<IOMX>(reply.readStrongBinder());
     }
+
+    virtual void addBatteryData(uint32_t params) {
+        Parcel data, reply;
+        data.writeInterfaceToken(IMediaPlayerService::getInterfaceDescriptor());
+        data.writeInt32(params);
+        remote()->transact(ADD_BATTERY_DATA, data, &reply);
+    }
+
+    virtual status_t pullBatteryData(Parcel* reply) {
+        Parcel data;
+        data.writeInterfaceToken(IMediaPlayerService::getInterfaceDescriptor());
+        return remote()->transact(PULL_BATTERY_DATA, data, reply);
+    }
 };
 
 IMPLEMENT_META_INTERFACE(MediaPlayerService, "android.media.IMediaPlayerService");
@@ -270,6 +285,17 @@
             reply->writeStrongBinder(omx->asBinder());
             return NO_ERROR;
         } break;
+        case ADD_BATTERY_DATA: {
+            CHECK_INTERFACE(IMediaPlayerService, data, reply);
+            uint32_t params = data.readInt32();
+            addBatteryData(params);
+            return NO_ERROR;
+        } break;
+        case PULL_BATTERY_DATA: {
+            CHECK_INTERFACE(IMediaPlayerService, data, reply);
+            pullBatteryData(reply);
+            return NO_ERROR;
+        } break;
         default:
             return BBinder::onTransact(code, data, reply, flags);
     }
diff --git a/media/libmediaplayerservice/MediaPlayerService.cpp b/media/libmediaplayerservice/MediaPlayerService.cpp
index 60bdd62..8c6f76b 100644
--- a/media/libmediaplayerservice/MediaPlayerService.cpp
+++ b/media/libmediaplayerservice/MediaPlayerService.cpp
@@ -23,6 +23,7 @@
 
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/time.h>
 #include <dirent.h>
 #include <unistd.h>
 
@@ -51,6 +52,8 @@
 #include <media/Metadata.h>
 #include <media/AudioTrack.h>
 
+#include <private/android_filesystem_config.h>
+
 #include "MediaRecorderClient.h"
 #include "MediaPlayerService.h"
 #include "MetadataRetrieverClient.h"
@@ -1762,4 +1765,93 @@
     return 0;
 }
 
+void MediaPlayerService::addBatteryData(uint32_t params)
+{
+    Mutex::Autolock lock(mLock);
+    int uid = IPCThreadState::self()->getCallingUid();
+    if (uid == AID_MEDIA) {
+        return;
+    }
+    int index = mBatteryData.indexOfKey(uid);
+    int32_t time = systemTime() / 1000000L;
+
+    if (index < 0) { // create a new entry for this UID
+        BatteryUsageInfo info;
+        info.audioTotalTime = 0;
+        info.videoTotalTime = 0;
+        info.audioLastTime = 0;
+        info.videoLastTime = 0;
+        info.refCount = 0;
+
+        mBatteryData.add(uid, info);
+    }
+
+    BatteryUsageInfo &info = mBatteryData.editValueFor(uid);
+
+    if (params & kBatteryDataCodecStarted) {
+        if (params & kBatteryDataTrackAudio) {
+            info.audioLastTime -= time;
+            info.refCount ++;
+        }
+        if (params & kBatteryDataTrackVideo) {
+            info.videoLastTime -= time;
+            info.refCount ++;
+        }
+    } else {
+        if (info.refCount == 0) {
+            LOGW("Battery track warning: refCount is already 0");
+            return;
+        } else if (info.refCount < 0) {
+            LOGE("Battery track error: refCount < 0");
+            mBatteryData.removeItem(uid);
+            return;
+        }
+
+        if (params & kBatteryDataTrackAudio) {
+            info.audioLastTime += time;
+            info.refCount --;
+        }
+        if (params & kBatteryDataTrackVideo) {
+            info.videoLastTime += time;
+            info.refCount --;
+        }
+
+        // no stream is being played by this UID
+        if (info.refCount == 0) {
+            info.audioTotalTime += info.audioLastTime;
+            info.audioLastTime = 0;
+            info.videoTotalTime += info.videoLastTime;
+            info.videoLastTime = 0;
+        }
+    }
+}
+
+status_t MediaPlayerService::pullBatteryData(Parcel* reply) {
+    Mutex::Autolock lock(mLock);
+    BatteryUsageInfo info;
+    int size = mBatteryData.size();
+
+    reply->writeInt32(size);
+    int i = 0;
+
+    while (i < size) {
+        info = mBatteryData.valueAt(i);
+
+        reply->writeInt32(mBatteryData.keyAt(i)); //UID
+        reply->writeInt32(info.audioTotalTime);
+        reply->writeInt32(info.videoTotalTime);
+
+        info.audioTotalTime = 0;
+        info.videoTotalTime = 0;
+
+        // remove the UID entry where no stream is being played
+        if (info.refCount <= 0) {
+            mBatteryData.removeItemsAt(i);
+            size --;
+            i --;
+        }
+        i++;
+    }
+    return NO_ERROR;
+}
 } // namespace android
diff --git a/media/libmediaplayerservice/MediaPlayerService.h b/media/libmediaplayerservice/MediaPlayerService.h
index 62f8ed6..9f41db0 100644
--- a/media/libmediaplayerservice/MediaPlayerService.h
+++ b/media/libmediaplayerservice/MediaPlayerService.h
@@ -204,7 +204,31 @@
 
             void                removeClient(wp<Client> client);
 
+    // For battery usage tracking purpose
+    struct BatteryUsageInfo {
+        // how many streams are being played by one UID
+        int     refCount;
+        // a temp variable to store the duration(ms) of audio codecs
+        // when we start a audio codec, we minus the system time from audioLastTime
+        // when we pause it, we add the system time back to the audioLastTime
+        // so after the pause, audioLastTime = pause time - start time
+        // if multiple audio streams are played (or recorded), then audioLastTime
+        // = the total playing time of all the streams
+        int32_t audioLastTime;
+        // when all the audio streams are being paused, we assign audioLastTime to
+        // this variable, so this value could be provided to the battery app
+        // in the next pullBatteryData call
+        int32_t audioTotalTime;
 
+        int32_t videoLastTime;
+        int32_t videoTotalTime;
+    };
+    KeyedVector<int, BatteryUsageInfo>    mBatteryData;
+
+    // Collect info of the codec usage from media player and media recorder
+    virtual void                addBatteryData(uint32_t params);
+    // API for the Battery app to pull the data of codecs usage
+    virtual status_t            pullBatteryData(Parcel* reply);
 private:
 
     class Client : public BnMediaPlayer {
diff --git a/media/libstagefright/AwesomePlayer.cpp b/media/libstagefright/AwesomePlayer.cpp
index b1d3630..1b63ab2 100644
--- a/media/libstagefright/AwesomePlayer.cpp
+++ b/media/libstagefright/AwesomePlayer.cpp
@@ -28,6 +28,8 @@
 #include "include/MPEG2TSExtractor.h"
 
 #include <binder/IPCThreadState.h>
+#include <binder/IServiceManager.h>
+#include <media/IMediaPlayerService.h>
 #include <media/stagefright/foundation/hexdump.h>
 #include <media/stagefright/foundation/ADebug.h>
 #include <media/stagefright/AudioPlayer.h>
@@ -155,8 +157,17 @@
             const AwesomeNativeWindowRenderer &);
 };
 
-////////////////////////////////////////////////////////////////////////////////
+// To collect the decoder usage
+void addBatteryData(uint32_t params) {
+    sp<IBinder> binder =
+        defaultServiceManager()->getService(String16("media.player"));
+    sp<IMediaPlayerService> service = interface_cast<IMediaPlayerService>(binder);
+    CHECK(service.get() != NULL);
 
+    service->addBatteryData(params);
+}
+
+////////////////////////////////////////////////////////////////////////////////
 AwesomePlayer::AwesomePlayer()
     : mQueueStarted(false),
       mTimeSource(NULL),
@@ -379,6 +390,17 @@
             mDrmManagerClient = NULL;
     }
 
+    if (mFlags & PLAYING) {
+        uint32_t params = IMediaPlayerService::kBatteryDataTrackDecoder;
+        if ((mAudioSource != NULL) && (mAudioSource != mAudioTrack)) {
+            params |= IMediaPlayerService::kBatteryDataTrackAudio;
+        }
+        if (mVideoSource != NULL) {
+            params |= IMediaPlayerService::kBatteryDataTrackVideo;
+        }
+        addBatteryData(params);
+    }
+
     if (mFlags & PREPARING) {
         mFlags |= PREPARE_CANCELLED;
         if (mConnectingDataSource != NULL) {
@@ -779,6 +801,16 @@
         seekTo_l(0);
     }
 
+    uint32_t params = IMediaPlayerService::kBatteryDataCodecStarted
+        | IMediaPlayerService::kBatteryDataTrackDecoder;
+    if ((mAudioSource != NULL) && (mAudioSource != mAudioTrack)) {
+        params |= IMediaPlayerService::kBatteryDataTrackAudio;
+    }
+    if (mVideoSource != NULL) {
+        params |= IMediaPlayerService::kBatteryDataTrackVideo;
+    }
+    addBatteryData(params);
+
     return OK;
 }
 
@@ -933,6 +965,16 @@
                 Playback::PAUSE, 0);
     }
 
+    uint32_t params = IMediaPlayerService::kBatteryDataTrackDecoder;
+    if ((mAudioSource != NULL) && (mAudioSource != mAudioTrack)) {
+        params |= IMediaPlayerService::kBatteryDataTrackAudio;
+    }
+    if (mVideoSource != NULL) {
+        params |= IMediaPlayerService::kBatteryDataTrackVideo;
+    }
+
+    addBatteryData(params);
+
     return OK;
 }