diff --git a/include/media/AudioEffect.h b/include/media/AudioEffect.h
index 7b0b443..4c57ed2 100644
--- a/include/media/AudioEffect.h
+++ b/include/media/AudioEffect.h
@@ -108,7 +108,8 @@
      * Returned value
      *   *descriptor updated with effect descriptor
      */
-    static status_t getEffectDescriptor(effect_uuid_t *uuid, effect_descriptor_t *descriptor);
+    static status_t getEffectDescriptor(effect_uuid_t *uuid,
+                                        effect_descriptor_t *descriptor) /*const*/;
 
 
     /*
diff --git a/include/media/IAudioFlinger.h b/include/media/IAudioFlinger.h
index 760595c..ba94bad 100644
--- a/include/media/IAudioFlinger.h
+++ b/include/media/IAudioFlinger.h
@@ -103,13 +103,13 @@
     virtual     bool        getMicMute() const = 0;
 
     virtual     status_t    setParameters(int ioHandle, const String8& keyValuePairs) = 0;
-    virtual     String8     getParameters(int ioHandle, const String8& keys) = 0;
+    virtual     String8     getParameters(int ioHandle, const String8& keys) const = 0;
 
     // register a current process for audio output change notifications
     virtual void registerClient(const sp<IAudioFlingerClient>& client) = 0;
 
     // retrieve the audio recording buffer size
-    virtual size_t getInputBufferSize(uint32_t sampleRate, audio_format_t format, int channelCount) = 0;
+    virtual size_t getInputBufferSize(uint32_t sampleRate, audio_format_t format, int channelCount) const = 0;
 
     virtual int openOutput(uint32_t *pDevices,
                                     uint32_t *pSamplingRate,
@@ -133,20 +133,21 @@
 
     virtual status_t setVoiceVolume(float volume) = 0;
 
-    virtual status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int output) = 0;
+    virtual status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int output) const = 0;
 
-    virtual unsigned int  getInputFramesLost(int ioHandle) = 0;
+    virtual unsigned int getInputFramesLost(int ioHandle) const = 0;
 
     virtual int newAudioSessionId() = 0;
 
     virtual void acquireAudioSessionId(int audioSession) = 0;
     virtual void releaseAudioSessionId(int audioSession) = 0;
 
-    virtual status_t queryNumberEffects(uint32_t *numEffects) = 0;
+    virtual status_t queryNumberEffects(uint32_t *numEffects) const = 0;
 
-    virtual status_t queryEffect(uint32_t index, effect_descriptor_t *pDescriptor) = 0;
+    virtual status_t queryEffect(uint32_t index, effect_descriptor_t *pDescriptor) const = 0;
 
-    virtual status_t getEffectDescriptor(effect_uuid_t *pEffectUUID, effect_descriptor_t *pDescriptor) = 0;
+    virtual status_t getEffectDescriptor(effect_uuid_t *pEffectUUID,
+                                        effect_descriptor_t *pDescriptor) const = 0;
 
     virtual sp<IEffect> createEffect(pid_t pid,
                                     effect_descriptor_t *pDesc,
diff --git a/media/libmedia/AudioEffect.cpp b/media/libmedia/AudioEffect.cpp
index a242846..bfa093d 100644
--- a/media/libmedia/AudioEffect.cpp
+++ b/media/libmedia/AudioEffect.cpp
@@ -412,7 +412,8 @@
     return af->queryEffect(index, descriptor);
 }
 
-status_t AudioEffect::getEffectDescriptor(effect_uuid_t *uuid, effect_descriptor_t *descriptor)
+status_t AudioEffect::getEffectDescriptor(effect_uuid_t *uuid,
+        effect_descriptor_t *descriptor) /*const*/
 {
     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
     if (af == 0) return PERMISSION_DENIED;
diff --git a/media/libmedia/IAudioFlinger.cpp b/media/libmedia/IAudioFlinger.cpp
index fc5520f..29b61df 100644
--- a/media/libmedia/IAudioFlinger.cpp
+++ b/media/libmedia/IAudioFlinger.cpp
@@ -325,7 +325,7 @@
         return reply.readInt32();
     }
 
-    virtual String8 getParameters(int ioHandle, const String8& keys)
+    virtual String8 getParameters(int ioHandle, const String8& keys) const
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
@@ -343,7 +343,7 @@
         remote()->transact(REGISTER_CLIENT, data, &reply);
     }
 
-    virtual size_t getInputBufferSize(uint32_t sampleRate, audio_format_t format, int channelCount)
+    virtual size_t getInputBufferSize(uint32_t sampleRate, audio_format_t format, int channelCount) const
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
@@ -487,7 +487,7 @@
         return reply.readInt32();
     }
 
-    virtual status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int output)
+    virtual status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int output) const
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
@@ -507,7 +507,7 @@
         return status;
     }
 
-    virtual unsigned int getInputFramesLost(int ioHandle)
+    virtual unsigned int getInputFramesLost(int ioHandle) const
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
@@ -544,7 +544,7 @@
         remote()->transact(RELEASE_AUDIO_SESSION_ID, data, &reply);
     }
 
-    virtual status_t queryNumberEffects(uint32_t *numEffects)
+    virtual status_t queryNumberEffects(uint32_t *numEffects) const
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
@@ -562,7 +562,7 @@
         return NO_ERROR;
     }
 
-    virtual status_t queryEffect(uint32_t index, effect_descriptor_t *pDescriptor)
+    virtual status_t queryEffect(uint32_t index, effect_descriptor_t *pDescriptor) const
     {
         if (pDescriptor == NULL) {
             return BAD_VALUE;
@@ -582,7 +582,8 @@
         return NO_ERROR;
     }
 
-    virtual status_t getEffectDescriptor(effect_uuid_t *pUuid, effect_descriptor_t *pDescriptor)
+    virtual status_t getEffectDescriptor(effect_uuid_t *pUuid,
+            effect_descriptor_t *pDescriptor) const
     {
         if (pUuid == NULL || pDescriptor == NULL) {
             return BAD_VALUE;
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index f71ba0a..e5f7ad2 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -816,7 +816,7 @@
     return BAD_VALUE;
 }
 
-String8 AudioFlinger::getParameters(int ioHandle, const String8& keys)
+String8 AudioFlinger::getParameters(int ioHandle, const String8& keys) const
 {
 //    ALOGV("getParameters() io %d, keys %s, tid %d, calling tid %d",
 //            ioHandle, keys.string(), gettid(), IPCThreadState::self()->getCallingPid());
@@ -846,7 +846,7 @@
     return String8("");
 }
 
-size_t AudioFlinger::getInputBufferSize(uint32_t sampleRate, audio_format_t format, int channelCount)
+size_t AudioFlinger::getInputBufferSize(uint32_t sampleRate, audio_format_t format, int channelCount) const
 {
     status_t ret = initCheck();
     if (ret != NO_ERROR) {
@@ -856,7 +856,7 @@
     return mPrimaryHardwareDev->get_input_buffer_size(mPrimaryHardwareDev, sampleRate, format, channelCount);
 }
 
-unsigned int AudioFlinger::getInputFramesLost(int ioHandle)
+unsigned int AudioFlinger::getInputFramesLost(int ioHandle) const
 {
     if (ioHandle == 0) {
         return 0;
@@ -891,7 +891,7 @@
     return ret;
 }
 
-status_t AudioFlinger::getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int output)
+status_t AudioFlinger::getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int output) const
 {
     status_t status;
 
@@ -5413,19 +5413,20 @@
 // ----------------------------------------------------------------------------
 
 
-status_t AudioFlinger::queryNumberEffects(uint32_t *numEffects)
+status_t AudioFlinger::queryNumberEffects(uint32_t *numEffects) const
 {
     Mutex::Autolock _l(mLock);
     return EffectQueryNumberEffects(numEffects);
 }
 
-status_t AudioFlinger::queryEffect(uint32_t index, effect_descriptor_t *descriptor)
+status_t AudioFlinger::queryEffect(uint32_t index, effect_descriptor_t *descriptor) const
 {
     Mutex::Autolock _l(mLock);
     return EffectQueryEffect(index, descriptor);
 }
 
-status_t AudioFlinger::getEffectDescriptor(effect_uuid_t *pUuid, effect_descriptor_t *descriptor)
+status_t AudioFlinger::getEffectDescriptor(effect_uuid_t *pUuid,
+        effect_descriptor_t *descriptor) const
 {
     Mutex::Autolock _l(mLock);
     return EffectGetDescriptor(pUuid, descriptor);
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index 3f3188c..4db7f15 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -105,12 +105,12 @@
     virtual     bool        getMicMute() const;
 
     virtual     status_t    setParameters(int ioHandle, const String8& keyValuePairs);
-    virtual     String8     getParameters(int ioHandle, const String8& keys);
+    virtual     String8     getParameters(int ioHandle, const String8& keys) const;
 
     virtual     void        registerClient(const sp<IAudioFlingerClient>& client);
 
-    virtual     size_t      getInputBufferSize(uint32_t sampleRate, audio_format_t format, int channelCount);
-    virtual     unsigned int  getInputFramesLost(int ioHandle);
+    virtual     size_t      getInputBufferSize(uint32_t sampleRate, audio_format_t format, int channelCount) const;
+    virtual     unsigned int  getInputFramesLost(int ioHandle) const;
 
     virtual int openOutput(uint32_t *pDevices,
                                     uint32_t *pSamplingRate,
@@ -139,7 +139,7 @@
 
     virtual status_t setVoiceVolume(float volume);
 
-    virtual status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int output);
+    virtual status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int output) const;
 
     virtual int newAudioSessionId();
 
@@ -147,11 +147,12 @@
 
     virtual void releaseAudioSessionId(int audioSession);
 
-    virtual status_t queryNumberEffects(uint32_t *numEffects);
+    virtual status_t queryNumberEffects(uint32_t *numEffects) const;
 
-    virtual status_t queryEffect(uint32_t index, effect_descriptor_t *descriptor);
+    virtual status_t queryEffect(uint32_t index, effect_descriptor_t *descriptor) const;
 
-    virtual status_t getEffectDescriptor(effect_uuid_t *pUuid, effect_descriptor_t *descriptor);
+    virtual status_t getEffectDescriptor(effect_uuid_t *pUuid,
+                                         effect_descriptor_t *descriptor) const;
 
     virtual sp<IEffect> createEffect(pid_t pid,
                         effect_descriptor_t *pDesc,