Use audio_io_handle_t consistently instead of int

Other:
 - add a comment to nextUniqueId
 - made ThreadBase::mId const, since it is only assigned in constructor.

Change-Id: I4e8b7bec4e45badcde6274d574b8a9aabd046837

10 files changed, 228 insertions, 194 deletions

diff --git a/include/media/AudioSystem.h b/include/media/AudioSystem.h
index 74a1e62..da99620 100644
--- a/include/media/AudioSystem.h
+++ b/include/media/AudioSystem.h
@@ -55,8 +55,10 @@ public:
     static status_t getMasterMute(bool* mute);
 
     // set/get stream volume on specified output
-    static status_t setStreamVolume(audio_stream_type_t stream, float value, int output);
-    static status_t getStreamVolume(audio_stream_type_t stream, float* volume, int output);
+    static status_t setStreamVolume(audio_stream_type_t stream, float value,
+                                    audio_io_handle_t output);
+    static status_t getStreamVolume(audio_stream_type_t stream, float* volume,
+                                    audio_io_handle_t output);
 
     // mute/unmute stream
     static status_t setStreamMute(audio_stream_type_t stream, bool mute);
@@ -217,7 +219,7 @@ private:
 
         // indicate a change in the configuration of an output or input: keeps the cached
         // values for output/input parameters upto date in client process
-        virtual void ioConfigChanged(int event, int ioHandle, void *param2);
+        virtual void ioConfigChanged(int event, audio_io_handle_t ioHandle, void *param2);
     };
 
     class AudioPolicyServiceClient: public IBinder::DeathRecipient
diff --git a/include/media/IAudioFlinger.h b/include/media/IAudioFlinger.h
index 361cee6..433ce7c 100644
--- a/include/media/IAudioFlinger.h
+++ b/include/media/IAudioFlinger.h
@@ -27,6 +27,7 @@
 #include <media/IAudioTrack.h>
 #include <media/IAudioRecord.h>
 #include <media/IAudioFlingerClient.h>
+#include <system/audio.h>
 #include <hardware/audio_effect.h>
 #include <media/IEffect.h>
 #include <media/IEffectClient.h>
@@ -53,13 +54,13 @@ public:
                                 int frameCount,
                                 uint32_t flags,
                                 const sp<IMemory>& sharedBuffer,
-                                int output,
+                                audio_io_handle_t output,
                                 int *sessionId,
                                 status_t *status) = 0;
 
     virtual sp<IAudioRecord> openRecord(
                                 pid_t pid,
-                                int input,
+                                audio_io_handle_t input,
                                 uint32_t sampleRate,
                                 audio_format_t format,
                                 uint32_t channelMask,
@@ -71,11 +72,11 @@ public:
     /* query the audio hardware state. This state never changes,
      * and therefore can be cached.
      */
-    virtual     uint32_t    sampleRate(int output) const = 0;
-    virtual     int         channelCount(int output) const = 0;
-    virtual     audio_format_t format(int output) const = 0;
-    virtual     size_t      frameCount(int output) const = 0;
-    virtual     uint32_t    latency(int output) const = 0;
+    virtual     uint32_t    sampleRate(audio_io_handle_t output) const = 0;
+    virtual     int         channelCount(audio_io_handle_t output) const = 0;
+    virtual     audio_format_t format(audio_io_handle_t output) const = 0;
+    virtual     size_t      frameCount(audio_io_handle_t output) const = 0;
+    virtual     uint32_t    latency(audio_io_handle_t output) const = 0;
 
     /* set/get the audio hardware state. This will probably be used by
      * the preference panel, mostly.
@@ -89,10 +90,12 @@ public:
     /* set/get stream type state. This will probably be used by
      * the preference panel, mostly.
      */
-    virtual     status_t    setStreamVolume(audio_stream_type_t stream, float value, int output) = 0;
+    virtual     status_t    setStreamVolume(audio_stream_type_t stream, float value,
+                                    audio_io_handle_t output) = 0;
     virtual     status_t    setStreamMute(audio_stream_type_t stream, bool muted) = 0;
 
-    virtual     float       streamVolume(audio_stream_type_t stream, int output) const = 0;
+    virtual     float       streamVolume(audio_stream_type_t stream,
+                                    audio_io_handle_t output) const = 0;
     virtual     bool        streamMute(audio_stream_type_t stream) const = 0;
 
     // set audio mode
@@ -102,8 +105,9 @@ public:
     virtual     status_t    setMicMute(bool state) = 0;
     virtual     bool        getMicMute() const = 0;
 
-    virtual     status_t    setParameters(int ioHandle, const String8& keyValuePairs) = 0;
-    virtual     String8     getParameters(int ioHandle, const String8& keys) const = 0;
+    virtual     status_t    setParameters(audio_io_handle_t ioHandle,
+                                    const String8& keyValuePairs) = 0;
+    virtual     String8     getParameters(audio_io_handle_t ioHandle, const String8& keys) const = 0;
 
     // register a current process for audio output change notifications
     virtual void registerClient(const sp<IAudioFlingerClient>& client) = 0;
@@ -111,31 +115,33 @@ public:
     // retrieve the audio recording buffer size
     virtual size_t getInputBufferSize(uint32_t sampleRate, audio_format_t format, int channelCount) const = 0;
 
-    virtual int openOutput(uint32_t *pDevices,
+    virtual audio_io_handle_t openOutput(uint32_t *pDevices,
                                     uint32_t *pSamplingRate,
                                     audio_format_t *pFormat,
                                     uint32_t *pChannels,
                                     uint32_t *pLatencyMs,
                                     uint32_t flags) = 0;
-    virtual int openDuplicateOutput(int output1, int output2) = 0;
-    virtual status_t closeOutput(int output) = 0;
-    virtual status_t suspendOutput(int output) = 0;
-    virtual status_t restoreOutput(int output) = 0;
+    virtual audio_io_handle_t openDuplicateOutput(audio_io_handle_t output1,
+                                    audio_io_handle_t output2) = 0;
+    virtual status_t closeOutput(audio_io_handle_t output) = 0;
+    virtual status_t suspendOutput(audio_io_handle_t output) = 0;
+    virtual status_t restoreOutput(audio_io_handle_t output) = 0;
 
-    virtual int openInput(uint32_t *pDevices,
+    virtual audio_io_handle_t openInput(uint32_t *pDevices,
                                     uint32_t *pSamplingRate,
                                     audio_format_t *pFormat,
                                     uint32_t *pChannels,
                                     audio_in_acoustics_t acoustics) = 0;
-    virtual status_t closeInput(int input) = 0;
+    virtual status_t closeInput(audio_io_handle_t input) = 0;
 
-    virtual status_t setStreamOutput(audio_stream_type_t stream, int output) = 0;
+    virtual status_t setStreamOutput(audio_stream_type_t stream, audio_io_handle_t output) = 0;
 
     virtual status_t setVoiceVolume(float volume) = 0;
 
-    virtual status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int output) const = 0;
+    virtual status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames,
+                                    audio_io_handle_t output) const = 0;
 
-    virtual unsigned int getInputFramesLost(int ioHandle) const = 0;
+    virtual unsigned int getInputFramesLost(audio_io_handle_t ioHandle) const = 0;
 
     virtual int newAudioSessionId() = 0;
 
@@ -153,13 +159,14 @@ public:
                                     effect_descriptor_t *pDesc,
                                     const sp<IEffectClient>& client,
                                     int32_t priority,
-                                    int output,
+                                    audio_io_handle_t output,
                                     int sessionId,
                                     status_t *status,
                                     int *id,
                                     int *enabled) = 0;
 
-    virtual status_t moveEffects(int session, int srcOutput, int dstOutput) = 0;
+    virtual status_t moveEffects(int session, audio_io_handle_t srcOutput,
+                                    audio_io_handle_t dstOutput) = 0;
 };
 
 
diff --git a/include/media/IAudioFlingerClient.h b/include/media/IAudioFlingerClient.h
index aa0cdcf..f3b4df1 100644
--- a/include/media/IAudioFlingerClient.h
+++ b/include/media/IAudioFlingerClient.h
@@ -21,6 +21,7 @@
 #include <utils/RefBase.h>
 #include <binder/IInterface.h>
 #include <utils/KeyedVector.h>
+#include <system/audio.h>
 
 namespace android {
 
@@ -32,7 +33,7 @@ public:
     DECLARE_META_INTERFACE(AudioFlingerClient);
 
     // Notifies a change of audio input/output configuration.
-    virtual void ioConfigChanged(int event, int ioHandle, void *param2) = 0;
+    virtual void ioConfigChanged(int event, audio_io_handle_t ioHandle, void *param2) = 0;
 
 };
 
diff --git a/media/libmedia/AudioSystem.cpp b/media/libmedia/AudioSystem.cpp
index 110a294..ec4c044 100644
--- a/media/libmedia/AudioSystem.cpp
+++ b/media/libmedia/AudioSystem.cpp
@@ -121,7 +121,8 @@ status_t AudioSystem::getMasterMute(bool* mute)
     return NO_ERROR;
 }
 
-status_t AudioSystem::setStreamVolume(audio_stream_type_t stream, float value, int output)
+status_t AudioSystem::setStreamVolume(audio_stream_type_t stream, float value,
+        audio_io_handle_t output)
 {
     if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
@@ -139,7 +140,8 @@ status_t AudioSystem::setStreamMute(audio_stream_type_t stream, bool mute)
     return NO_ERROR;
 }
 
-status_t AudioSystem::getStreamVolume(audio_stream_type_t stream, float* volume, int output)
+status_t AudioSystem::getStreamVolume(audio_stream_type_t stream, float* volume,
+        audio_io_handle_t output)
 {
     if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
@@ -402,7 +404,8 @@ void AudioSystem::AudioFlingerClient::binderDied(const wp<IBinder>& who) {
     ALOGW("AudioFlinger server died!");
 }
 
-void AudioSystem::AudioFlingerClient::ioConfigChanged(int event, int ioHandle, void *param2) {
+void AudioSystem::AudioFlingerClient::ioConfigChanged(int event, audio_io_handle_t ioHandle,
+        void *param2) {
     ALOGV("ioConfigChanged() event %d", event);
     OutputDescriptor *desc;
     audio_stream_type_t stream;
diff --git a/media/libmedia/IAudioFlinger.cpp b/media/libmedia/IAudioFlinger.cpp
index f6cf5ae..c3252e7 100644
--- a/media/libmedia/IAudioFlinger.cpp
+++ b/media/libmedia/IAudioFlinger.cpp
@@ -89,7 +89,7 @@ public:
                                 int frameCount,
                                 uint32_t flags,
                                 const sp<IMemory>& sharedBuffer,
-                                int output,
+                                audio_io_handle_t output,
                                 int *sessionId,
                                 status_t *status)
     {
@@ -104,7 +104,7 @@ public:
         data.writeInt32(frameCount);
         data.writeInt32(flags);
         data.writeStrongBinder(sharedBuffer->asBinder());
-        data.writeInt32(output);
+        data.writeInt32((int32_t) output);
         int lSessionId = 0;
         if (sessionId != NULL) {
             lSessionId = *sessionId;
@@ -129,7 +129,7 @@ public:
 
     virtual sp<IAudioRecord> openRecord(
                                 pid_t pid,
-                                int input,
+                                audio_io_handle_t input,
                                 uint32_t sampleRate,
                                 audio_format_t format,
                                 uint32_t channelMask,
@@ -142,7 +142,7 @@ public:
         sp<IAudioRecord> record;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
         data.writeInt32(pid);
-        data.writeInt32(input);
+        data.writeInt32((int32_t) input);
         data.writeInt32(sampleRate);
         data.writeInt32(format);
         data.writeInt32(channelMask);
@@ -170,47 +170,47 @@ public:
         return record;
     }
 
-    virtual uint32_t sampleRate(int output) const
+    virtual uint32_t sampleRate(audio_io_handle_t output) const
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
-        data.writeInt32(output);
+        data.writeInt32((int32_t) output);
         remote()->transact(SAMPLE_RATE, data, &reply);
         return reply.readInt32();
     }
 
-    virtual int channelCount(int output) const
+    virtual int channelCount(audio_io_handle_t output) const
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
-        data.writeInt32(output);
+        data.writeInt32((int32_t) output);
         remote()->transact(CHANNEL_COUNT, data, &reply);
         return reply.readInt32();
     }
 
-    virtual audio_format_t format(int output) const
+    virtual audio_format_t format(audio_io_handle_t output) const
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
-        data.writeInt32(output);
+        data.writeInt32((int32_t) output);
         remote()->transact(FORMAT, data, &reply);
         return (audio_format_t) reply.readInt32();
     }
 
-    virtual size_t frameCount(int output) const
+    virtual size_t frameCount(audio_io_handle_t output) const
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
-        data.writeInt32(output);
+        data.writeInt32((int32_t) output);
         remote()->transact(FRAME_COUNT, data, &reply);
         return reply.readInt32();
     }
 
-    virtual uint32_t latency(int output) const
+    virtual uint32_t latency(audio_io_handle_t output) const
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
-        data.writeInt32(output);
+        data.writeInt32((int32_t) output);
         remote()->transact(LATENCY, data, &reply);
         return reply.readInt32();
     }
@@ -249,13 +249,14 @@ public:
         return reply.readInt32();
     }
 
-    virtual status_t setStreamVolume(audio_stream_type_t stream, float value, int output)
+    virtual status_t setStreamVolume(audio_stream_type_t stream, float value,
+            audio_io_handle_t output)
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
         data.writeInt32((int32_t) stream);
         data.writeFloat(value);
-        data.writeInt32(output);
+        data.writeInt32((int32_t) output);
         remote()->transact(SET_STREAM_VOLUME, data, &reply);
         return reply.readInt32();
     }
@@ -270,12 +271,12 @@ public:
         return reply.readInt32();
     }
 
-    virtual float streamVolume(audio_stream_type_t stream, int output) const
+    virtual float streamVolume(audio_stream_type_t stream, audio_io_handle_t output) const
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
         data.writeInt32((int32_t) stream);
-        data.writeInt32(output);
+        data.writeInt32((int32_t) output);
         remote()->transact(STREAM_VOLUME, data, &reply);
         return reply.readFloat();
     }
@@ -315,21 +316,21 @@ public:
         return reply.readInt32();
     }
 
-    virtual status_t setParameters(int ioHandle, const String8& keyValuePairs)
+    virtual status_t setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs)
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
-        data.writeInt32(ioHandle);
+        data.writeInt32((int32_t) ioHandle);
         data.writeString8(keyValuePairs);
         remote()->transact(SET_PARAMETERS, data, &reply);
         return reply.readInt32();
     }
 
-    virtual String8 getParameters(int ioHandle, const String8& keys) const
+    virtual String8 getParameters(audio_io_handle_t ioHandle, const String8& keys) const
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
-        data.writeInt32(ioHandle);
+        data.writeInt32((int32_t) ioHandle);
         data.writeString8(keys);
         remote()->transact(GET_PARAMETERS, data, &reply);
         return reply.readString8();
@@ -354,7 +355,7 @@ public:
         return reply.readInt32();
     }
 
-    virtual int openOutput(uint32_t *pDevices,
+    virtual audio_io_handle_t openOutput(uint32_t *pDevices,
                             uint32_t *pSamplingRate,
                             audio_format_t *pFormat,
                             uint32_t *pChannels,
@@ -376,8 +377,8 @@ public:
         data.writeInt32(latency);
         data.writeInt32(flags);
         remote()->transact(OPEN_OUTPUT, data, &reply);
-        int  output = reply.readInt32();
-        ALOGV("openOutput() returned output, %p", output);
+        audio_io_handle_t output = (audio_io_handle_t) reply.readInt32();
+        ALOGV("openOutput() returned output, %d", output);
         devices = reply.readInt32();
         if (pDevices) *pDevices = devices;
         samplingRate = reply.readInt32();
@@ -391,44 +392,45 @@ public:
         return output;
     }
 
-    virtual int openDuplicateOutput(int output1, int output2)
+    virtual audio_io_handle_t openDuplicateOutput(audio_io_handle_t output1,
+            audio_io_handle_t output2)
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
-        data.writeInt32(output1);
-        data.writeInt32(output2);
+        data.writeInt32((int32_t) output1);
+        data.writeInt32((int32_t) output2);
         remote()->transact(OPEN_DUPLICATE_OUTPUT, data, &reply);
-        return reply.readInt32();
+        return (audio_io_handle_t) reply.readInt32();
     }
 
-    virtual status_t closeOutput(int output)
+    virtual status_t closeOutput(audio_io_handle_t output)
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
-        data.writeInt32(output);
+        data.writeInt32((int32_t) output);
         remote()->transact(CLOSE_OUTPUT, data, &reply);
         return reply.readInt32();
     }
 
-    virtual status_t suspendOutput(int output)
+    virtual status_t suspendOutput(audio_io_handle_t output)
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
-        data.writeInt32(output);
+        data.writeInt32((int32_t) output);
         remote()->transact(SUSPEND_OUTPUT, data, &reply);
         return reply.readInt32();
     }
 
-    virtual status_t restoreOutput(int output)
+    virtual status_t restoreOutput(audio_io_handle_t output)
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
-        data.writeInt32(output);
+        data.writeInt32((int32_t) output);
         remote()->transact(RESTORE_OUTPUT, data, &reply);
         return reply.readInt32();
     }
 
-    virtual int openInput(uint32_t *pDevices,
+    virtual audio_io_handle_t openInput(uint32_t *pDevices,
                             uint32_t *pSamplingRate,
                             audio_format_t *pFormat,
                             uint32_t *pChannels,
@@ -447,7 +449,7 @@ public:
         data.writeInt32(channels);
         data.writeInt32((int32_t) acoustics);
         remote()->transact(OPEN_INPUT, data, &reply);
-        int input = reply.readInt32();
+        audio_io_handle_t input = (audio_io_handle_t) reply.readInt32();
         devices = reply.readInt32();
         if (pDevices) *pDevices = devices;
         samplingRate = reply.readInt32();
@@ -468,12 +470,12 @@ public:
         return reply.readInt32();
     }
 
-    virtual status_t setStreamOutput(audio_stream_type_t stream, int output)
+    virtual status_t setStreamOutput(audio_stream_type_t stream, audio_io_handle_t output)
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
         data.writeInt32((int32_t) stream);
-        data.writeInt32(output);
+        data.writeInt32((int32_t) output);
         remote()->transact(SET_STREAM_OUTPUT, data, &reply);
         return reply.readInt32();
     }
@@ -487,11 +489,12 @@ public:
         return reply.readInt32();
     }
 
-    virtual status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int output) const
+    virtual status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames,
+            audio_io_handle_t output) const
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
-        data.writeInt32(output);
+        data.writeInt32((int32_t) output);
         remote()->transact(GET_RENDER_POSITION, data, &reply);
         status_t status = reply.readInt32();
         if (status == NO_ERROR) {
@@ -507,11 +510,11 @@ public:
         return status;
     }
 
-    virtual unsigned int getInputFramesLost(int ioHandle) const
+    virtual unsigned int getInputFramesLost(audio_io_handle_t ioHandle) const
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
-        data.writeInt32(ioHandle);
+        data.writeInt32((int32_t) ioHandle);
         remote()->transact(GET_INPUT_FRAMES_LOST, data, &reply);
         return reply.readInt32();
     }
@@ -607,7 +610,7 @@ public:
                                     effect_descriptor_t *pDesc,
                                     const sp<IEffectClient>& client,
                                     int32_t priority,
-                                    int output,
+                                    audio_io_handle_t output,
                                     int sessionId,
                                     status_t *status,
                                     int *id,
@@ -628,7 +631,7 @@ public:
         data.write(pDesc, sizeof(effect_descriptor_t));
         data.writeStrongBinder(client->asBinder());
         data.writeInt32(priority);
-        data.writeInt32(output);
+        data.writeInt32((int32_t) output);
         data.writeInt32(sessionId);
 
         status_t lStatus = remote()->transact(CREATE_EFFECT, data, &reply);
@@ -654,13 +657,14 @@ public:
         return effect;
     }
 
-    virtual status_t moveEffects(int session, int srcOutput, int dstOutput)
+    virtual status_t moveEffects(int session, audio_io_handle_t srcOutput,
+            audio_io_handle_t dstOutput)
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
         data.writeInt32(session);
-        data.writeInt32(srcOutput);
-        data.writeInt32(dstOutput);
+        data.writeInt32((int32_t) srcOutput);
+        data.writeInt32((int32_t) dstOutput);
         remote()->transact(MOVE_EFFECTS, data, &reply);
         return reply.readInt32();
     }
@@ -684,7 +688,7 @@ status_t BnAudioFlinger::onTransact(
             size_t bufferCount = data.readInt32();
             uint32_t flags = data.readInt32();
             sp<IMemory> buffer = interface_cast<IMemory>(data.readStrongBinder());
-            int output = data.readInt32();
+            audio_io_handle_t output = (audio_io_handle_t) data.readInt32();
             int sessionId = data.readInt32();
             status_t status;
             sp<IAudioTrack> track = createTrack(pid,
@@ -698,7 +702,7 @@ status_t BnAudioFlinger::onTransact(
         case OPEN_RECORD: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
             pid_t pid = data.readInt32();
-            int input = data.readInt32();
+            audio_io_handle_t input = (audio_io_handle_t) data.readInt32();
             uint32_t sampleRate = data.readInt32();
             audio_format_t format = (audio_format_t) data.readInt32();
             int channelCount = data.readInt32();
@@ -715,27 +719,27 @@ status_t BnAudioFlinger::onTransact(
         } break;
         case SAMPLE_RATE: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
-            reply->writeInt32( sampleRate(data.readInt32()) );
+            reply->writeInt32( sampleRate((audio_io_handle_t) data.readInt32()) );
             return NO_ERROR;
         } break;
         case CHANNEL_COUNT: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
-            reply->writeInt32( channelCount(data.readInt32()) );
+            reply->writeInt32( channelCount((audio_io_handle_t) data.readInt32()) );
             return NO_ERROR;
         } break;
         case FORMAT: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
-            reply->writeInt32( format(data.readInt32()) );
+            reply->writeInt32( format((audio_io_handle_t) data.readInt32()) );
             return NO_ERROR;
         } break;
         case FRAME_COUNT: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
-            reply->writeInt32( frameCount(data.readInt32()) );
+            reply->writeInt32( frameCount((audio_io_handle_t) data.readInt32()) );
             return NO_ERROR;
         } break;
         case LATENCY: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
-            reply->writeInt32( latency(data.readInt32()) );
+            reply->writeInt32( latency((audio_io_handle_t) data.readInt32()) );
             return NO_ERROR;
         } break;
          case SET_MASTER_VOLUME: {
@@ -762,7 +766,7 @@ status_t BnAudioFlinger::onTransact(
             CHECK_INTERFACE(IAudioFlinger, data, reply);
             int stream = data.readInt32();
             float volume = data.readFloat();
-            int output = data.readInt32();
+            audio_io_handle_t output = (audio_io_handle_t) data.readInt32();
             reply->writeInt32( setStreamVolume((audio_stream_type_t) stream, volume, output) );
             return NO_ERROR;
         } break;
@@ -804,14 +808,14 @@ status_t BnAudioFlinger::onTransact(
         } break;
         case SET_PARAMETERS: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
-            int ioHandle = data.readInt32();
+            audio_io_handle_t ioHandle = (audio_io_handle_t) data.readInt32();
             String8 keyValuePairs(data.readString8());
             reply->writeInt32(setParameters(ioHandle, keyValuePairs));
             return NO_ERROR;
          } break;
         case GET_PARAMETERS: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
-            int ioHandle = data.readInt32();
+            audio_io_handle_t ioHandle = (audio_io_handle_t) data.readInt32();
             String8 keys(data.readString8());
             reply->writeString8(getParameters(ioHandle, keys));
             return NO_ERROR;
@@ -839,14 +843,14 @@ status_t BnAudioFlinger::onTransact(
             uint32_t channels = data.readInt32();
             uint32_t latency = data.readInt32();
             uint32_t flags = data.readInt32();
-            int output = openOutput(&devices,
+            audio_io_handle_t output = openOutput(&devices,
                                      &samplingRate,
                                      &format,
                                      &channels,
                                      &latency,
                                      flags);
             ALOGV("OPEN_OUTPUT output, %p", output);
-            reply->writeInt32(output);
+            reply->writeInt32((int32_t) output);
             reply->writeInt32(devices);
             reply->writeInt32(samplingRate);
             reply->writeInt32(format);
@@ -856,24 +860,24 @@ status_t BnAudioFlinger::onTransact(
         } break;
         case OPEN_DUPLICATE_OUTPUT: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
-            int output1 = data.readInt32();
-            int output2 = data.readInt32();
-            reply->writeInt32(openDuplicateOutput(output1, output2));
+            audio_io_handle_t output1 = (audio_io_handle_t) data.readInt32();
+            audio_io_handle_t output2 = (audio_io_handle_t) data.readInt32();
+            reply->writeInt32((int32_t) openDuplicateOutput(output1, output2));
             return NO_ERROR;
         } break;
         case CLOSE_OUTPUT: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
-            reply->writeInt32(closeOutput(data.readInt32()));
+            reply->writeInt32(closeOutput((audio_io_handle_t) data.readInt32()));
             return NO_ERROR;
         } break;
         case SUSPEND_OUTPUT: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
-            reply->writeInt32(suspendOutput(data.readInt32()));
+            reply->writeInt32(suspendOutput((audio_io_handle_t) data.readInt32()));
             return NO_ERROR;
         } break;
         case RESTORE_OUTPUT: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
-            reply->writeInt32(restoreOutput(data.readInt32()));
+            reply->writeInt32(restoreOutput((audio_io_handle_t) data.readInt32()));
             return NO_ERROR;
         } break;
         case OPEN_INPUT: {
@@ -884,12 +888,12 @@ status_t BnAudioFlinger::onTransact(
             uint32_t channels = data.readInt32();
             audio_in_acoustics_t acoustics = (audio_in_acoustics_t) data.readInt32();
 
-            int input = openInput(&devices,
+            audio_io_handle_t input = openInput(&devices,
                                      &samplingRate,
                                      &format,
                                      &channels,
                                      acoustics);
-            reply->writeInt32(input);
+            reply->writeInt32((int32_t) input);
             reply->writeInt32(devices);
             reply->writeInt32(samplingRate);
             reply->writeInt32(format);
@@ -898,13 +902,13 @@ status_t BnAudioFlinger::onTransact(
         } break;
         case CLOSE_INPUT: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
-            reply->writeInt32(closeInput(data.readInt32()));
+            reply->writeInt32(closeInput((audio_io_handle_t) data.readInt32()));
             return NO_ERROR;
         } break;
         case SET_STREAM_OUTPUT: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
             uint32_t stream = data.readInt32();
-            int output = data.readInt32();
+            audio_io_handle_t output = (audio_io_handle_t) data.readInt32();
             reply->writeInt32(setStreamOutput((audio_stream_type_t) stream, output));
             return NO_ERROR;
         } break;
@@ -916,7 +920,7 @@ status_t BnAudioFlinger::onTransact(
         } break;
         case GET_RENDER_POSITION: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
-            int output = data.readInt32();
+            audio_io_handle_t output = (audio_io_handle_t) data.readInt32();
             uint32_t halFrames;
             uint32_t dspFrames;
             status_t status = getRenderPosition(&halFrames, &dspFrames, output);
@@ -929,7 +933,7 @@ status_t BnAudioFlinger::onTransact(
         }
         case GET_INPUT_FRAMES_LOST: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
-            int ioHandle = data.readInt32();
+            audio_io_handle_t ioHandle = (audio_io_handle_t) data.readInt32();
             reply->writeInt32(getInputFramesLost(ioHandle));
             return NO_ERROR;
         } break;
@@ -989,7 +993,7 @@ status_t BnAudioFlinger::onTransact(
             data.read(&desc, sizeof(effect_descriptor_t));
             sp<IEffectClient> client = interface_cast<IEffectClient>(data.readStrongBinder());
             int32_t priority = data.readInt32();
-            int output = data.readInt32();
+            audio_io_handle_t output = (audio_io_handle_t) data.readInt32();
             int sessionId = data.readInt32();
             status_t status;
             int id;
@@ -1006,8 +1010,8 @@ status_t BnAudioFlinger::onTransact(
         case MOVE_EFFECTS: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
             int session = data.readInt32();
-            int srcOutput = data.readInt32();
-            int dstOutput = data.readInt32();
+            audio_io_handle_t srcOutput = (audio_io_handle_t) data.readInt32();
+            audio_io_handle_t dstOutput = (audio_io_handle_t) data.readInt32();
             reply->writeInt32(moveEffects(session, srcOutput, dstOutput));
             return NO_ERROR;
         } break;
diff --git a/media/libmedia/IAudioFlingerClient.cpp b/media/libmedia/IAudioFlingerClient.cpp
index 9458bc0..ce28b33 100644
--- a/media/libmedia/IAudioFlingerClient.cpp
+++ b/media/libmedia/IAudioFlingerClient.cpp
@@ -39,12 +39,12 @@ public:
     {
     }
 
-    void ioConfigChanged(int event, int ioHandle, void *param2)
+    void ioConfigChanged(int event, audio_io_handle_t ioHandle, void *param2)
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlingerClient::getInterfaceDescriptor());
         data.writeInt32(event);
-        data.writeInt32(ioHandle);
+        data.writeInt32((int32_t) ioHandle);
         if (event == AudioSystem::STREAM_CONFIG_CHANGED) {
             uint32_t stream = *(uint32_t *)param2;
             ALOGV("ioConfigChanged stream %d", stream);
@@ -72,7 +72,7 @@ status_t BnAudioFlingerClient::onTransact(
     case IO_CONFIG_CHANGED: {
             CHECK_INTERFACE(IAudioFlingerClient, data, reply);
             int event = data.readInt32();
-            int ioHandle = data.readInt32();
+            audio_io_handle_t ioHandle = (audio_io_handle_t) data.readInt32();
             void *param2 = NULL;
             AudioSystem::OutputDescriptor desc;
             uint32_t stream;
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 70fb808..d05e9d9 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -383,7 +383,7 @@ sp<IAudioTrack> AudioFlinger::createTrack(
         int frameCount,
         uint32_t flags,
         const sp<IMemory>& sharedBuffer,
-        int output,
+        audio_io_handle_t output,
         int *sessionId,
         status_t *status)
 {
@@ -476,7 +476,7 @@ Exit:
     return trackHandle;
 }
 
-uint32_t AudioFlinger::sampleRate(int output) const
+uint32_t AudioFlinger::sampleRate(audio_io_handle_t output) const
 {
     Mutex::Autolock _l(mLock);
     PlaybackThread *thread = checkPlaybackThread_l(output);
@@ -487,7 +487,7 @@ uint32_t AudioFlinger::sampleRate(int output) const
     return thread->sampleRate();
 }
 
-int AudioFlinger::channelCount(int output) const
+int AudioFlinger::channelCount(audio_io_handle_t output) const
 {
     Mutex::Autolock _l(mLock);
     PlaybackThread *thread = checkPlaybackThread_l(output);
@@ -498,7 +498,7 @@ int AudioFlinger::channelCount(int output) const
     return thread->channelCount();
 }
 
-audio_format_t AudioFlinger::format(int output) const
+audio_format_t AudioFlinger::format(audio_io_handle_t output) const
 {
     Mutex::Autolock _l(mLock);
     PlaybackThread *thread = checkPlaybackThread_l(output);
@@ -509,7 +509,7 @@ audio_format_t AudioFlinger::format(int output) const
     return thread->format();
 }
 
-size_t AudioFlinger::frameCount(int output) const
+size_t AudioFlinger::frameCount(audio_io_handle_t output) const
 {
     Mutex::Autolock _l(mLock);
     PlaybackThread *thread = checkPlaybackThread_l(output);
@@ -520,7 +520,7 @@ size_t AudioFlinger::frameCount(int output) const
     return thread->frameCount();
 }
 
-uint32_t AudioFlinger::latency(int output) const
+uint32_t AudioFlinger::latency(audio_io_handle_t output) const
 {
     Mutex::Autolock _l(mLock);
     PlaybackThread *thread = checkPlaybackThread_l(output);
@@ -654,7 +654,8 @@ bool AudioFlinger::masterMute() const
     return masterMute_l();
 }
 
-status_t AudioFlinger::setStreamVolume(audio_stream_type_t stream, float value, int output)
+status_t AudioFlinger::setStreamVolume(audio_stream_type_t stream, float value,
+        audio_io_handle_t output)
 {
     // check calling permissions
     if (!settingsAllowed()) {
@@ -709,7 +710,7 @@ status_t AudioFlinger::setStreamMute(audio_stream_type_t stream, bool muted)
     return NO_ERROR;
 }
 
-float AudioFlinger::streamVolume(audio_stream_type_t stream, int output) const
+float AudioFlinger::streamVolume(audio_stream_type_t stream, audio_io_handle_t output) const
 {
     if (uint32_t(stream) >= AUDIO_STREAM_CNT) {
         return 0.0f;
@@ -739,7 +740,7 @@ bool AudioFlinger::streamMute(audio_stream_type_t stream) const
     return mStreamTypes[stream].mute;
 }
 
-status_t AudioFlinger::setParameters(int ioHandle, const String8& keyValuePairs)
+status_t AudioFlinger::setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs)
 {
     status_t result;
 
@@ -814,7 +815,7 @@ status_t AudioFlinger::setParameters(int ioHandle, const String8& keyValuePairs)
     return BAD_VALUE;
 }
 
-String8 AudioFlinger::getParameters(int ioHandle, const String8& keys) const
+String8 AudioFlinger::getParameters(audio_io_handle_t ioHandle, const String8& keys) const
 {
 //    ALOGV("getParameters() io %d, keys %s, tid %d, calling tid %d",
 //            ioHandle, keys.string(), gettid(), IPCThreadState::self()->getCallingPid());
@@ -854,7 +855,7 @@ size_t AudioFlinger::getInputBufferSize(uint32_t sampleRate, audio_format_t form
     return mPrimaryHardwareDev->get_input_buffer_size(mPrimaryHardwareDev, sampleRate, format, channelCount);
 }
 
-unsigned int AudioFlinger::getInputFramesLost(int ioHandle) const
+unsigned int AudioFlinger::getInputFramesLost(audio_io_handle_t ioHandle) const
 {
     if (ioHandle == 0) {
         return 0;
@@ -889,7 +890,8 @@ status_t AudioFlinger::setVoiceVolume(float value)
     return ret;
 }
 
-status_t AudioFlinger::getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int output) const
+status_t AudioFlinger::getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames,
+        audio_io_handle_t output) const
 {
     status_t status;
 
@@ -964,7 +966,7 @@ void AudioFlinger::removeNotificationClient(pid_t pid)
 }
 
 // audioConfigChanged_l() must be called with AudioFlinger::mLock held
-void AudioFlinger::audioConfigChanged_l(int event, int ioHandle, void *param2)
+void AudioFlinger::audioConfigChanged_l(int event, audio_io_handle_t ioHandle, void *param2)
 {
     size_t size = mNotificationClients.size();
     for (size_t i = 0; i < size; i++) {
@@ -983,8 +985,8 @@ void AudioFlinger::removeClient_l(pid_t pid)
 
 // ----------------------------------------------------------------------------
 
-AudioFlinger::ThreadBase::ThreadBase(const sp<AudioFlinger>& audioFlinger, int id, uint32_t device,
-        type_t type)
+AudioFlinger::ThreadBase::ThreadBase(const sp<AudioFlinger>& audioFlinger, audio_io_handle_t id,
+        uint32_t device, type_t type)
     :   Thread(false),
         mType(type),
         mAudioFlinger(audioFlinger), mSampleRate(0), mFrameCount(0),
@@ -1354,7 +1356,7 @@ void AudioFlinger::ThreadBase::checkSuspendOnEffectEnabled_l(const sp<EffectModu
 
 AudioFlinger::PlaybackThread::PlaybackThread(const sp<AudioFlinger>& audioFlinger,
                                              AudioStreamOut* output,
-                                             int id,
+                                             audio_io_handle_t id,
                                              uint32_t device,
                                              type_t type)
     :   ThreadBase(audioFlinger, id, device, type),
@@ -1820,7 +1822,7 @@ uint32_t AudioFlinger::PlaybackThread::activeSleepTimeUs()
 // ----------------------------------------------------------------------------
 
 AudioFlinger::MixerThread::MixerThread(const sp<AudioFlinger>& audioFlinger, AudioStreamOut* output,
-        int id, uint32_t device, type_t type)
+        audio_io_handle_t id, uint32_t device, type_t type)
     :   PlaybackThread(audioFlinger, output, id, device, type),
         mAudioMixer(new AudioMixer(mFrameCount, mSampleRate)),
         mPrevMixerStatus(MIXER_IDLE)
@@ -2487,7 +2489,8 @@ uint32_t AudioFlinger::MixerThread::suspendSleepTimeUs()
 }
 
 // ----------------------------------------------------------------------------
-AudioFlinger::DirectOutputThread::DirectOutputThread(const sp<AudioFlinger>& audioFlinger, AudioStreamOut* output, int id, uint32_t device)
+AudioFlinger::DirectOutputThread::DirectOutputThread(const sp<AudioFlinger>& audioFlinger,
+        AudioStreamOut* output, audio_io_handle_t id, uint32_t device)
     :   PlaybackThread(audioFlinger, output, id, device, DIRECT)
         // mLeftVolFloat, mRightVolFloat
         // mLeftVolShort, mRightVolShort
@@ -2969,7 +2972,7 @@ uint32_t AudioFlinger::DirectOutputThread::suspendSleepTimeUs()
 // ----------------------------------------------------------------------------
 
 AudioFlinger::DuplicatingThread::DuplicatingThread(const sp<AudioFlinger>& audioFlinger,
-        AudioFlinger::MixerThread* mainThread, int id)
+        AudioFlinger::MixerThread* mainThread, audio_io_handle_t id)
     :   MixerThread(audioFlinger, mainThread->getOutput(), id, mainThread->device(), DUPLICATING),
         mWaitTimeMs(UINT_MAX)
 {
@@ -4116,7 +4119,7 @@ status_t AudioFlinger::TrackHandle::onTransact(
 
 sp<IAudioRecord> AudioFlinger::openRecord(
         pid_t pid,
-        int input,
+        audio_io_handle_t input,
         uint32_t sampleRate,
         audio_format_t format,
         uint32_t channelMask,
@@ -4233,7 +4236,7 @@ AudioFlinger::RecordThread::RecordThread(const sp<AudioFlinger>& audioFlinger,
                                          AudioStreamIn *input,
                                          uint32_t sampleRate,
                                          uint32_t channels,
-                                         int id,
+                                         audio_io_handle_t id,
                                          uint32_t device) :
     ThreadBase(audioFlinger, id, device, RECORD),
     mInput(input), mTrack(NULL), mResampler(NULL), mRsmpOutBuffer(NULL), mRsmpInBuffer(NULL),
@@ -4893,7 +4896,7 @@ audio_stream_t* AudioFlinger::RecordThread::stream()
 
 // ----------------------------------------------------------------------------
 
-int AudioFlinger::openOutput(uint32_t *pDevices,
+audio_io_handle_t AudioFlinger::openOutput(uint32_t *pDevices,
                                 uint32_t *pSamplingRate,
                                 audio_format_t *pFormat,
                                 uint32_t *pChannels,
@@ -4939,7 +4942,7 @@ int AudioFlinger::openOutput(uint32_t *pDevices,
     mHardwareStatus = AUDIO_HW_IDLE;
     if (outStream != NULL) {
         AudioStreamOut *output = new AudioStreamOut(outHwDev, outStream);
-        int id = nextUniqueId();
+        audio_io_handle_t id = nextUniqueId();
 
         if ((flags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT) ||
             (format != AUDIO_FORMAT_PCM_16_BIT) ||
@@ -4965,7 +4968,8 @@ int AudioFlinger::openOutput(uint32_t *pDevices,
     return 0;
 }
 
-int AudioFlinger::openDuplicateOutput(int output1, int output2)
+audio_io_handle_t AudioFlinger::openDuplicateOutput(audio_io_handle_t output1,
+        audio_io_handle_t output2)
 {
     Mutex::Autolock _l(mLock);
     MixerThread *thread1 = checkMixerThread_l(output1);
@@ -4976,7 +4980,7 @@ int AudioFlinger::openDuplicateOutput(int output1, int output2)
         return 0;
     }
 
-    int id = nextUniqueId();
+    audio_io_handle_t id = nextUniqueId();
     DuplicatingThread *thread = new DuplicatingThread(this, thread1, id);
     thread->addOutputTrack(thread2);
     mPlaybackThreads.add(id, thread);
@@ -4985,7 +4989,7 @@ int AudioFlinger::openDuplicateOutput(int output1, int output2)
     return id;
 }
 
-status_t AudioFlinger::closeOutput(int output)
+status_t AudioFlinger::closeOutput(audio_io_handle_t output)
 {
     // keep strong reference on the playback thread so that
     // it is not destroyed while exit() is executed
@@ -5023,7 +5027,7 @@ status_t AudioFlinger::closeOutput(int output)
     return NO_ERROR;
 }
 
-status_t AudioFlinger::suspendOutput(int output)
+status_t AudioFlinger::suspendOutput(audio_io_handle_t output)
 {
     Mutex::Autolock _l(mLock);
     PlaybackThread *thread = checkPlaybackThread_l(output);
@@ -5038,7 +5042,7 @@ status_t AudioFlinger::suspendOutput(int output)
     return NO_ERROR;
 }
 
-status_t AudioFlinger::restoreOutput(int output)
+status_t AudioFlinger::restoreOutput(audio_io_handle_t output)
 {
     Mutex::Autolock _l(mLock);
     PlaybackThread *thread = checkPlaybackThread_l(output);
@@ -5054,7 +5058,7 @@ status_t AudioFlinger::restoreOutput(int output)
     return NO_ERROR;
 }
 
-int AudioFlinger::openInput(uint32_t *pDevices,
+audio_io_handle_t AudioFlinger::openInput(uint32_t *pDevices,
                                 uint32_t *pSamplingRate,
                                 audio_format_t *pFormat,
                                 uint32_t *pChannels,
@@ -5110,7 +5114,7 @@ int AudioFlinger::openInput(uint32_t *pDevices,
     if (inStream != NULL) {
         AudioStreamIn *input = new AudioStreamIn(inHwDev, inStream);
 
-        int id = nextUniqueId();
+        audio_io_handle_t id = nextUniqueId();
         // Start record thread
         // RecorThread require both input and output device indication to forward to audio
         // pre processing modules
@@ -5137,7 +5141,7 @@ int AudioFlinger::openInput(uint32_t *pDevices,
     return 0;
 }
 
-status_t AudioFlinger::closeInput(int input)
+status_t AudioFlinger::closeInput(audio_io_handle_t input)
 {
     // keep strong reference on the record thread so that
     // it is not destroyed while exit() is executed
@@ -5165,7 +5169,7 @@ status_t AudioFlinger::closeInput(int input)
     return NO_ERROR;
 }
 
-status_t AudioFlinger::setStreamOutput(audio_stream_type_t stream, int output)
+status_t AudioFlinger::setStreamOutput(audio_stream_type_t stream, audio_io_handle_t output)
 {
     Mutex::Autolock _l(mLock);
     MixerThread *dstThread = checkMixerThread_l(output);
@@ -5303,7 +5307,7 @@ void AudioFlinger::purgeStaleEffects_l() {
 }
 
 // checkPlaybackThread_l() must be called with AudioFlinger::mLock held
-AudioFlinger::PlaybackThread *AudioFlinger::checkPlaybackThread_l(int output) const
+AudioFlinger::PlaybackThread *AudioFlinger::checkPlaybackThread_l(audio_io_handle_t output) const
 {
     PlaybackThread *thread = NULL;
     if (mPlaybackThreads.indexOfKey(output) >= 0) {
@@ -5313,7 +5317,7 @@ AudioFlinger::PlaybackThread *AudioFlinger::checkPlaybackThread_l(int output) co
 }
 
 // checkMixerThread_l() must be called with AudioFlinger::mLock held
-AudioFlinger::MixerThread *AudioFlinger::checkMixerThread_l(int output) const
+AudioFlinger::MixerThread *AudioFlinger::checkMixerThread_l(audio_io_handle_t output) const
 {
     PlaybackThread *thread = checkPlaybackThread_l(output);
     if (thread != NULL) {
@@ -5325,7 +5329,7 @@ AudioFlinger::MixerThread *AudioFlinger::checkMixerThread_l(int output) const
 }
 
 // checkRecordThread_l() must be called with AudioFlinger::mLock held
-AudioFlinger::RecordThread *AudioFlinger::checkRecordThread_l(int input) const
+AudioFlinger::RecordThread *AudioFlinger::checkRecordThread_l(audio_io_handle_t input) const
 {
     RecordThread *thread = NULL;
     if (mRecordThreads.indexOfKey(input) >= 0) {
@@ -5392,7 +5396,7 @@ sp<IEffect> AudioFlinger::createEffect(pid_t pid,
         effect_descriptor_t *pDesc,
         const sp<IEffectClient>& effectClient,
         int32_t priority,
-        int io,
+        audio_io_handle_t io,
         int sessionId,
         status_t *status,
         int *id,
@@ -5579,7 +5583,8 @@ Exit:
     return handle;
 }
 
-status_t AudioFlinger::moveEffects(int sessionId, int srcOutput, int dstOutput)
+status_t AudioFlinger::moveEffects(int sessionId, audio_io_handle_t srcOutput,
+        audio_io_handle_t dstOutput)
 {
     ALOGV("moveEffects() session %d, srcOutput %d, dstOutput %d",
             sessionId, srcOutput, dstOutput);
@@ -5630,7 +5635,7 @@ status_t AudioFlinger::moveEffectChain_l(int sessionId,
 
     // transfer all effects one by one so that new effect chain is created on new thread with
     // correct buffer sizes and audio parameters and effect engines reconfigured accordingly
-    int dstOutput = dstThread->id();
+    audio_io_handle_t dstOutput = dstThread->id();
     sp<EffectChain> dstChain;
     uint32_t strategy = 0; // prevent compiler warning
     sp<EffectModule> effect = chain->getEffectFromId_l(0);
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index eca7eb8..dac9986 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -77,15 +77,15 @@ public:
                                 int frameCount,
                                 uint32_t flags,
                                 const sp<IMemory>& sharedBuffer,
-                                int output,
+                                audio_io_handle_t output,
                                 int *sessionId,
                                 status_t *status);
 
-    virtual     uint32_t    sampleRate(int output) const;
-    virtual     int         channelCount(int output) const;
-    virtual     audio_format_t format(int output) const;
-    virtual     size_t      frameCount(int output) const;
-    virtual     uint32_t    latency(int output) const;
+    virtual     uint32_t    sampleRate(audio_io_handle_t output) const;
+    virtual     int         channelCount(audio_io_handle_t output) const;
+    virtual     audio_format_t format(audio_io_handle_t output) const;
+    virtual     size_t      frameCount(audio_io_handle_t output) const;
+    virtual     uint32_t    latency(audio_io_handle_t output) const;
 
     virtual     status_t    setMasterVolume(float value);
     virtual     status_t    setMasterMute(bool muted);
@@ -93,10 +93,12 @@ public:
     virtual     float       masterVolume() const;
     virtual     bool        masterMute() const;
 
-    virtual     status_t    setStreamVolume(audio_stream_type_t stream, float value, int output);
+    virtual     status_t    setStreamVolume(audio_stream_type_t stream, float value,
+                                            audio_io_handle_t output);
     virtual     status_t    setStreamMute(audio_stream_type_t stream, bool muted);
 
-    virtual     float       streamVolume(audio_stream_type_t stream, int output) const;
+    virtual     float       streamVolume(audio_stream_type_t stream,
+                                         audio_io_handle_t output) const;
     virtual     bool        streamMute(audio_stream_type_t stream) const;
 
     virtual     status_t    setMode(audio_mode_t mode);
@@ -104,42 +106,44 @@ public:
     virtual     status_t    setMicMute(bool state);
     virtual     bool        getMicMute() const;
 
-    virtual     status_t    setParameters(int ioHandle, const String8& keyValuePairs);
-    virtual     String8     getParameters(int ioHandle, const String8& keys) const;
+    virtual     status_t    setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs);
+    virtual     String8     getParameters(audio_io_handle_t 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) const;
-    virtual     unsigned int  getInputFramesLost(int ioHandle) const;
+    virtual     unsigned int  getInputFramesLost(audio_io_handle_t ioHandle) const;
 
-    virtual int openOutput(uint32_t *pDevices,
+    virtual audio_io_handle_t openOutput(uint32_t *pDevices,
                                     uint32_t *pSamplingRate,
                                     audio_format_t *pFormat,
                                     uint32_t *pChannels,
                                     uint32_t *pLatencyMs,
                                     uint32_t flags);
 
-    virtual int openDuplicateOutput(int output1, int output2);
+    virtual audio_io_handle_t openDuplicateOutput(audio_io_handle_t output1,
+                                                  audio_io_handle_t output2);
 
-    virtual status_t closeOutput(int output);
+    virtual status_t closeOutput(audio_io_handle_t output);
 
-    virtual status_t suspendOutput(int output);
+    virtual status_t suspendOutput(audio_io_handle_t output);
 
-    virtual status_t restoreOutput(int output);
+    virtual status_t restoreOutput(audio_io_handle_t output);
 
-    virtual int openInput(uint32_t *pDevices,
+    virtual audio_io_handle_t openInput(uint32_t *pDevices,
                             uint32_t *pSamplingRate,
                             audio_format_t *pFormat,
                             uint32_t *pChannels,
                             audio_in_acoustics_t acoustics);
 
-    virtual status_t closeInput(int input);
+    virtual status_t closeInput(audio_io_handle_t input);
 
-    virtual status_t setStreamOutput(audio_stream_type_t stream, int output);
+    virtual status_t setStreamOutput(audio_stream_type_t stream, audio_io_handle_t output);
 
     virtual status_t setVoiceVolume(float volume);
 
-    virtual status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int output) const;
+    virtual status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames,
+                                       audio_io_handle_t output) const;
 
     virtual int newAudioSessionId();
 
@@ -158,13 +162,14 @@ public:
                         effect_descriptor_t *pDesc,
                         const sp<IEffectClient>& effectClient,
                         int32_t priority,
-                        int io,
+                        audio_io_handle_t io,
                         int sessionId,
                         status_t *status,
                         int *id,
                         int *enabled);
 
-    virtual status_t moveEffects(int sessionId, int srcOutput, int dstOutput);
+    virtual status_t moveEffects(int sessionId, audio_io_handle_t srcOutput,
+                        audio_io_handle_t dstOutput);
 
     enum hardware_call_state {
         AUDIO_HW_IDLE = 0,
@@ -188,7 +193,7 @@ public:
     // record interface
     virtual sp<IAudioRecord> openRecord(
                                 pid_t pid,
-                                int input,
+                                audio_io_handle_t input,
                                 uint32_t sampleRate,
                                 audio_format_t format,
                                 uint32_t channelMask,
@@ -286,7 +291,7 @@ private:
             RECORD              // Thread class is RecordThread
         };
 
-        ThreadBase (const sp<AudioFlinger>& audioFlinger, int id, uint32_t device, type_t type);
+        ThreadBase (const sp<AudioFlinger>& audioFlinger, audio_io_handle_t id, uint32_t device, type_t type);
         virtual             ~ThreadBase();
 
         status_t dumpBase(int fd, const Vector<String16>& args);
@@ -422,7 +427,7 @@ private:
                     void        sendConfigEvent(int event, int param = 0);
                     void        sendConfigEvent_l(int event, int param = 0);
                     void        processConfigEvents();
-                    int         id() const { return mId;}
+                    audio_io_handle_t id() const { return mId;}
                     bool        standby() { return mStandby; }
                     uint32_t    device() { return mDevice; }
         virtual     audio_stream_t* stream() = 0;
@@ -544,7 +549,7 @@ private:
                     status_t                mParamStatus;
                     Vector<ConfigEvent>     mConfigEvents;
                     bool                    mStandby;
-                    int                     mId;
+                    const audio_io_handle_t mId;
                     bool                    mExiting;
                     Vector< sp<EffectChain> > mEffectChains;
                     uint32_t                mDevice;    // output device for PlaybackThread
@@ -691,8 +696,8 @@ private:
             DuplicatingThread* const mSourceThread; // for waitTimeMs() in write()
         };  // end of OutputTrack
 
-        PlaybackThread (const sp<AudioFlinger>& audioFlinger, AudioStreamOut* output, int id,
-                        uint32_t device, type_t type);
+        PlaybackThread (const sp<AudioFlinger>& audioFlinger, AudioStreamOut* output,
+                        audio_io_handle_t id, uint32_t device, type_t type);
         virtual             ~PlaybackThread();
 
         virtual     status_t    dump(int fd, const Vector<String16>& args);
@@ -817,7 +822,7 @@ private:
     public:
         MixerThread (const sp<AudioFlinger>& audioFlinger,
                      AudioStreamOut* output,
-                     int id,
+                     audio_io_handle_t id,
                      uint32_t device,
                      type_t type = MIXER);
         virtual             ~MixerThread();
@@ -844,7 +849,8 @@ private:
     class DirectOutputThread : public PlaybackThread {
     public:
 
-        DirectOutputThread (const sp<AudioFlinger>& audioFlinger, AudioStreamOut* output, int id, uint32_t device);
+        DirectOutputThread (const sp<AudioFlinger>& audioFlinger, AudioStreamOut* output,
+                            audio_io_handle_t id, uint32_t device);
         virtual                 ~DirectOutputThread();
 
         // Thread virtuals
@@ -870,7 +876,8 @@ private:
 
     class DuplicatingThread : public MixerThread {
     public:
-        DuplicatingThread (const sp<AudioFlinger>& audioFlinger, MixerThread* mainThread, int id);
+        DuplicatingThread (const sp<AudioFlinger>& audioFlinger, MixerThread* mainThread,
+                           audio_io_handle_t id);
         virtual                 ~DuplicatingThread();
 
         // Thread virtuals
@@ -889,13 +896,16 @@ private:
                     uint32_t    mWaitTimeMs;
     };
 
-              PlaybackThread *checkPlaybackThread_l(int output) const;
-              MixerThread *checkMixerThread_l(int output) const;
-              RecordThread *checkRecordThread_l(int input) const;
-              float streamVolumeInternal(audio_stream_type_t stream) const { return mStreamTypes[stream].volume; }
-              void audioConfigChanged_l(int event, int ioHandle, void *param2);
+              PlaybackThread *checkPlaybackThread_l(audio_io_handle_t output) const;
+              MixerThread *checkMixerThread_l(audio_io_handle_t output) const;
+              RecordThread *checkRecordThread_l(audio_io_handle_t input) const;
+              float streamVolumeInternal(audio_stream_type_t stream) const
+                                { return mStreamTypes[stream].volume; }
+              void audioConfigChanged_l(int event, audio_io_handle_t ioHandle, void *param2);
 
+              // allocate an audio_io_handle_t, session ID, or effect ID
               uint32_t nextUniqueId();
+
               status_t moveEffectChain_l(int sessionId,
                                      AudioFlinger::PlaybackThread *srcThread,
                                      AudioFlinger::PlaybackThread *dstThread,
@@ -973,7 +983,7 @@ private:
                         AudioStreamIn *input,
                         uint32_t sampleRate,
                         uint32_t channels,
-                        int id,
+                        audio_io_handle_t id,
                         uint32_t device);
                 virtual     ~RecordThread();
 
@@ -1401,14 +1411,14 @@ mutable Mutex               mLock;      // mutex for process, commands and handl
     mutable     hardware_call_state                 mHardwareStatus;    // for dump only
 
 
-                DefaultKeyedVector< int, sp<PlaybackThread> >  mPlaybackThreads;
+                DefaultKeyedVector< audio_io_handle_t, sp<PlaybackThread> >  mPlaybackThreads;
                 PlaybackThread::stream_type_t       mStreamTypes[AUDIO_STREAM_CNT];
 
                 // both are protected by mLock
                 float                               mMasterVolume;
                 bool                                mMasterMute;
 
-                DefaultKeyedVector< int, sp<RecordThread> >    mRecordThreads;
+                DefaultKeyedVector< audio_io_handle_t, sp<RecordThread> >    mRecordThreads;
 
                 DefaultKeyedVector< pid_t, sp<NotificationClient> >    mNotificationClients;
                 volatile int32_t                    mNextUniqueId;
diff --git a/services/audioflinger/AudioPolicyService.cpp b/services/audioflinger/AudioPolicyService.cpp
index 755f51f..10efd85 100644
--- a/services/audioflinger/AudioPolicyService.cpp
+++ b/services/audioflinger/AudioPolicyService.cpp
@@ -819,7 +819,7 @@ void AudioPolicyService::AudioCommandThread::stopToneCommand()
 
 status_t AudioPolicyService::AudioCommandThread::volumeCommand(audio_stream_type_t stream,
                                                                float volume,
-                                                               int output,
+                                                               audio_io_handle_t output,
                                                                int delayMs)
 {
     status_t status = NO_ERROR;
@@ -849,7 +849,7 @@ status_t AudioPolicyService::AudioCommandThread::volumeCommand(audio_stream_type
     return status;
 }
 
-status_t AudioPolicyService::AudioCommandThread::parametersCommand(int ioHandle,
+status_t AudioPolicyService::AudioCommandThread::parametersCommand(audio_io_handle_t ioHandle,
                                                                    const char *keyValuePairs,
                                                                    int delayMs)
 {
@@ -1019,7 +1019,7 @@ void AudioPolicyService::setParameters(audio_io_handle_t ioHandle,
                                        const char *keyValuePairs,
                                        int delayMs)
 {
-    mAudioCommandThread->parametersCommand((int)ioHandle, keyValuePairs,
+    mAudioCommandThread->parametersCommand(ioHandle, keyValuePairs,
                                            delayMs);
 }
 
@@ -1029,7 +1029,7 @@ int AudioPolicyService::setStreamVolume(audio_stream_type_t stream,
                                         int delayMs)
 {
     return (int)mAudioCommandThread->volumeCommand(stream, volume,
-                                                   (int)output, delayMs);
+                                                   output, delayMs);
 }
 
 int AudioPolicyService::startTone(audio_policy_tone_t tone,
@@ -1458,7 +1458,7 @@ static int aps_move_effects(void *service, int session,
     if (af == 0)
         return PERMISSION_DENIED;
 
-    return af->moveEffects(session, (int)src_output, (int)dst_output);
+    return af->moveEffects(session, src_output, dst_output);
 }
 
 static char * aps_get_parameters(void *service, audio_io_handle_t io_handle,
diff --git a/services/audioflinger/AudioPolicyService.h b/services/audioflinger/AudioPolicyService.h
index 62219e5..fdaf576 100644
--- a/services/audioflinger/AudioPolicyService.h
+++ b/services/audioflinger/AudioPolicyService.h
@@ -174,8 +174,10 @@ private:
                     void        startToneCommand(ToneGenerator::tone_type type,
                                                  audio_stream_type_t stream);
                     void        stopToneCommand();
-                    status_t    volumeCommand(audio_stream_type_t stream, float volume, int output, int delayMs = 0);
-                    status_t    parametersCommand(int ioHandle, const char *keyValuePairs, int delayMs = 0);
+                    status_t    volumeCommand(audio_stream_type_t stream, float volume,
+                                            audio_io_handle_t output, int delayMs = 0);
+                    status_t    parametersCommand(audio_io_handle_t ioHandle,
+                                            const char *keyValuePairs, int delayMs = 0);
                     status_t    voiceVolumeCommand(float volume, int delayMs = 0);
                     void        insertCommand_l(AudioCommand *command, int delayMs = 0);
 
@@ -207,12 +209,12 @@ private:
         public:
             audio_stream_type_t mStream;
             float mVolume;
-            int mIO;
+            audio_io_handle_t mIO;
         };
 
         class ParametersData {
         public:
-            int mIO;
+            audio_io_handle_t mIO;
             String8 mKeyValuePairs;
         };