include/media/AudioRecord.h - platform/frameworks/av - Git at Google

 /*
  * Copyright (C) 2008 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #ifndef AUDIORECORD_H_
 #define AUDIORECORD_H_

 #include <stdint.h>
 #include <sys/types.h>

 #include <media/IAudioFlinger.h>
 #include <media/IAudioRecord.h>
 #include <media/AudioTrack.h>

 #include <utils/RefBase.h>
 #include <utils/Errors.h>
 #include <binder/IInterface.h>
 #include <binder/IMemory.h>
 #include <utils/threads.h>


 namespace android {

 // ----------------------------------------------------------------------------

 class AudioRecord
 {
 public:

     static const int DEFAULT_SAMPLE_RATE = 8000;

     /* Events used by AudioRecord callback function (callback_t).
      *
      * to keep in sync with frameworks/base/media/java/android/media/AudioRecord.java
      */
     enum event_type {
         EVENT_MORE_DATA = 0,        // Request to reqd more data from PCM buffer.
         EVENT_OVERRUN = 1,          // PCM buffer overrun occured.
         EVENT_MARKER = 2,           // Record head is at the specified marker position
                                     // (See setMarkerPosition()).
         EVENT_NEW_POS = 3,          // Record head is at a new position
                                     // (See setPositionUpdatePeriod()).
     };

     /* Create Buffer on the stack and pass it to obtainBuffer()
      * and releaseBuffer().
      */

     class Buffer
     {
     public:
         enum {
             MUTE    = 0x00000001
         };
         uint32_t    flags;
         int         channelCount;
         int         format;
         size_t      frameCount;
         size_t      size;
         union {
             void*       raw;
             short*      i16;
             int8_t*     i8;
         };
     };

     /* These are static methods to control the system-wide AudioFlinger
      * only privileged processes can have access to them
      */

 //    static status_t setMasterMute(bool mute);

     /* As a convenience, if a callback is supplied, a handler thread
      * is automatically created with the appropriate priority. This thread
      * invokes the callback when a new buffer becomes ready or an overrun condition occurs.
      * Parameters:
      *
      * event:   type of event notified (see enum AudioRecord::event_type).
      * user:    Pointer to context for use by the callback receiver.
      * info:    Pointer to optional parameter according to event type:
      *          - EVENT_MORE_DATA: pointer to AudioRecord::Buffer struct. The callback must not read
      *          more bytes than indicated by 'size' field and update 'size' if less bytes are
      *          read.
      *          - EVENT_OVERRUN: unused.
      *          - EVENT_MARKER: pointer to an uin32_t containing the marker position in frames.
      *          - EVENT_NEW_POS: pointer to an uin32_t containing the new position in frames.
      */

     typedef void (*callback_t)(int event, void* user, void *info);

     /* Returns the minimum frame count required for the successful creation of
      * an AudioRecord object.
      * Returned status (from utils/Errors.h) can be:
      *  - NO_ERROR: successful operation
      *  - NO_INIT: audio server or audio hardware not initialized
      *  - BAD_VALUE: unsupported configuration
      */

      static status_t getMinFrameCount(int* frameCount,
                                       uint32_t sampleRate,
                                       int format,
                                       int channelCount);

     /* Constructs an uninitialized AudioRecord. No connection with
      * AudioFlinger takes place.
      */
                         AudioRecord();

     /* Creates an AudioRecord track and registers it with AudioFlinger.
      * Once created, the track needs to be started before it can be used.
      * Unspecified values are set to the audio hardware's current
      * values.
      *
      * Parameters:
      *
      * inputSource:        Select the audio input to record to (e.g. AUDIO_SOURCE_DEFAULT).
      * sampleRate:         Track sampling rate in Hz.
      * format:             Audio format (e.g AudioSystem::PCM_16_BIT for signed
      *                     16 bits per sample).
      * channels:           Channel mask: see AudioSystem::audio_channels.
      * frameCount:         Total size of track PCM buffer in frames. This defines the
      *                     latency of the track.
      * flags:              A bitmask of acoustic values from enum record_flags.  It enables
      *                     AGC, NS, and IIR.
      * cbf:                Callback function. If not null, this function is called periodically
      *                     to provide new PCM data.
      * notificationFrames: The callback function is called each time notificationFrames PCM
      *                     frames are ready in record track output buffer.
      * user                Context for use by the callback receiver.
      */

      enum record_flags {
          RECORD_AGC_ENABLE = AudioSystem::AGC_ENABLE,
          RECORD_NS_ENABLE  = AudioSystem::NS_ENABLE,
          RECORD_IIR_ENABLE = AudioSystem::TX_IIR_ENABLE
      };

                         AudioRecord(int inputSource,
                                     uint32_t sampleRate = 0,
                                     int format          = 0,
                                     uint32_t channels = AudioSystem::CHANNEL_IN_MONO,
                                     int frameCount      = 0,
                                     uint32_t flags      = 0,
                                     callback_t cbf = 0,
                                     void* user = 0,
                                     int notificationFrames = 0,
                                     int sessionId = 0);


     /* Terminates the AudioRecord and unregisters it from AudioFlinger.
      * Also destroys all resources assotiated with the AudioRecord.
      */
                         ~AudioRecord();


     /* Initialize an uninitialized AudioRecord.
      * Returned status (from utils/Errors.h) can be:
      *  - NO_ERROR: successful intialization
      *  - INVALID_OPERATION: AudioRecord is already intitialized or record device is already in use
      *  - BAD_VALUE: invalid parameter (channels, format, sampleRate...)
      *  - NO_INIT: audio server or audio hardware not initialized
      *  - PERMISSION_DENIED: recording is not allowed for the requesting process
      * */
             status_t    set(int inputSource     = 0,
                             uint32_t sampleRate = 0,
                             int format          = 0,
                             uint32_t channels = AudioSystem::CHANNEL_IN_MONO,
                             int frameCount      = 0,
                             uint32_t flags      = 0,
                             callback_t cbf = 0,
                             void* user = 0,
                             int notificationFrames = 0,
                             bool threadCanCallJava = false,
                             int sessionId = 0);


     /* Result of constructing the AudioRecord. This must be checked
      * before using any AudioRecord API (except for set()), using
      * an uninitialized AudioRecord produces undefined results.
      * See set() method above for possible return codes.
      */
             status_t    initCheck() const;

     /* Returns this track's latency in milliseconds.
      * This includes the latency due to AudioRecord buffer size
      * and audio hardware driver.
      */
             uint32_t     latency() const;

    /* getters, see constructor */

             int         format() const;
             int         channelCount() const;
             int         channels() const;
             uint32_t    frameCount() const;
             int         frameSize() const;
             int         inputSource() const;


     /* After it's created the track is not active. Call start() to
      * make it active. If set, the callback will start being called.
      */
             status_t    start();

     /* Stop a track. If set, the callback will cease being called and
      * obtainBuffer returns STOPPED. Note that obtainBuffer() still works
      * and will fill up buffers until the pool is exhausted.
      */
             status_t    stop();
             bool        stopped() const;

     /* get sample rate for this record track
      */
             uint32_t    getSampleRate();

     /* Sets marker position. When record reaches the number of frames specified,
      * a callback with event type EVENT_MARKER is called. Calling setMarkerPosition
      * with marker == 0 cancels marker notification callback.
      * If the AudioRecord has been opened with no callback function associated,
      * the operation will fail.
      *
      * Parameters:
      *
      * marker:   marker position expressed in frames.
      *
      * Returned status (from utils/Errors.h) can be:
      *  - NO_ERROR: successful operation
      *  - INVALID_OPERATION: the AudioRecord has no callback installed.
      */
             status_t    setMarkerPosition(uint32_t marker);
             status_t    getMarkerPosition(uint32_t *marker);


     /* Sets position update period. Every time the number of frames specified has been recorded,
      * a callback with event type EVENT_NEW_POS is called.
      * Calling setPositionUpdatePeriod with updatePeriod == 0 cancels new position notification
      * callback.
      * If the AudioRecord has been opened with no callback function associated,
      * the operation will fail.
      *
      * Parameters:
      *
      * updatePeriod:  position update notification period expressed in frames.
      *
      * Returned status (from utils/Errors.h) can be:
      *  - NO_ERROR: successful operation
      *  - INVALID_OPERATION: the AudioRecord has no callback installed.
      */
             status_t    setPositionUpdatePeriod(uint32_t updatePeriod);
             status_t    getPositionUpdatePeriod(uint32_t *updatePeriod);


     /* Gets record head position. The position is the  total number of frames
      * recorded since record start.
      *
      * Parameters:
      *
      *  position:  Address where to return record head position within AudioRecord buffer.
      *
      * Returned status (from utils/Errors.h) can be:
      *  - NO_ERROR: successful operation
      *  - BAD_VALUE:  position is NULL
      */
             status_t    getPosition(uint32_t *position);

     /* returns a handle on the audio input used by this AudioRecord.
      *
      * Parameters:
      *  none.
      *
      * Returned value:
      *  handle on audio hardware input
      */
             audio_io_handle_t    getInput();

     /* returns the audio session ID associated to this AudioRecord.
      *
      * Parameters:
      *  none.
      *
      * Returned value:
      *  AudioRecord session ID.
      */
             int    getSessionId();

     /* obtains a buffer of "frameCount" frames. The buffer must be
      * filled entirely. If the track is stopped, obtainBuffer() returns
      * STOPPED instead of NO_ERROR as long as there are buffers availlable,
      * at which point NO_MORE_BUFFERS is returned.
      * Buffers will be returned until the pool (buffercount())
      * is exhausted, at which point obtainBuffer() will either block
      * or return WOULD_BLOCK depending on the value of the "blocking"
      * parameter.
      */

         enum {
             NO_MORE_BUFFERS = 0x80000001,
             STOPPED = 1
         };

             status_t    obtainBuffer(Buffer* audioBuffer, int32_t waitCount);
             void        releaseBuffer(Buffer* audioBuffer);


     /* As a convenience we provide a read() interface to the audio buffer.
      * This is implemented on top of lockBuffer/unlockBuffer.
      */
             ssize_t     read(void* buffer, size_t size);

     /* Return the amount of input frames lost in the audio driver since the last call of this function.
      * Audio driver is expected to reset the value to 0 and restart counting upon returning the current value by this function call.
      * Such loss typically occurs when the user space process is blocked longer than the capacity of audio driver buffers.
      * Unit: the number of input audio frames
      */
             unsigned int  getInputFramesLost();

 private:
     /* copying audio tracks is not allowed */
                         AudioRecord(const AudioRecord& other);
             AudioRecord& operator = (const AudioRecord& other);

     /* a small internal class to handle the callback */
     class ClientRecordThread : public Thread
     {
     public:
         ClientRecordThread(AudioRecord& receiver, bool bCanCallJava = false);
     private:
         friend class AudioRecord;
         virtual bool        threadLoop();
         virtual status_t    readyToRun() { return NO_ERROR; }
         virtual void        onFirstRef() {}
         AudioRecord& mReceiver;
         Mutex       mLock;
     };

             bool processAudioBuffer(const sp<ClientRecordThread>& thread);
             status_t openRecord_l(uint32_t sampleRate,
                                 int format,
                                 int channelCount,
                                 int frameCount,
                                 uint32_t flags,
                                 audio_io_handle_t input);
             audio_io_handle_t getInput_l();
             status_t restoreRecord_l(audio_track_cblk_t*& cblk);

     sp<IAudioRecord>        mAudioRecord;
     sp<IMemory>             mCblkMemory;
     sp<ClientRecordThread>  mClientRecordThread;
     Mutex                   mLock;

     uint32_t                mFrameCount;

     audio_track_cblk_t*     mCblk;
     uint8_t                 mFormat;
     uint8_t                 mChannelCount;
     uint8_t                 mInputSource;
     uint8_t                 mReserved;
     status_t                mStatus;
     uint32_t                mLatency;

     volatile int32_t        mActive;

     callback_t              mCbf;
     void*                   mUserData;
     uint32_t                mNotificationFrames;
     uint32_t                mRemainingFrames;
     uint32_t                mMarkerPosition;
     bool                    mMarkerReached;
     uint32_t                mNewPosition;
     uint32_t                mUpdatePeriod;
     uint32_t                mFlags;
     uint32_t                mChannels;
     audio_io_handle_t       mInput;
     int                     mSessionId;
 };

 }; // namespace android

 #endif /*AUDIORECORD_H_*/
	/*
	* Copyright (C) 2008 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#ifndef AUDIORECORD_H_
	#define AUDIORECORD_H_

	#include <stdint.h>
	#include <sys/types.h>

	#include <media/IAudioFlinger.h>
	#include <media/IAudioRecord.h>
	#include <media/AudioTrack.h>

	#include <utils/RefBase.h>
	#include <utils/Errors.h>
	#include <binder/IInterface.h>
	#include <binder/IMemory.h>
	#include <utils/threads.h>


	namespace android {

	// ----------------------------------------------------------------------------

	class AudioRecord
	{
	public:

	static const int DEFAULT_SAMPLE_RATE = 8000;

	/* Events used by AudioRecord callback function (callback_t).
	*
	* to keep in sync with frameworks/base/media/java/android/media/AudioRecord.java
	*/
	enum event_type {
	EVENT_MORE_DATA = 0, // Request to reqd more data from PCM buffer.
	EVENT_OVERRUN = 1, // PCM buffer overrun occured.
	EVENT_MARKER = 2, // Record head is at the specified marker position
	// (See setMarkerPosition()).
	EVENT_NEW_POS = 3, // Record head is at a new position
	// (See setPositionUpdatePeriod()).
	};

	/* Create Buffer on the stack and pass it to obtainBuffer()
	* and releaseBuffer().
	*/

	class Buffer
	{
	public:
	enum {
	MUTE = 0x00000001
	};
	uint32_t flags;
	int channelCount;
	int format;
	size_t frameCount;
	size_t size;
	union {
	void* raw;
	short* i16;
	int8_t* i8;
	};
	};

	/* These are static methods to control the system-wide AudioFlinger
	* only privileged processes can have access to them
	*/

	// static status_t setMasterMute(bool mute);

	/* As a convenience, if a callback is supplied, a handler thread
	* is automatically created with the appropriate priority. This thread
	* invokes the callback when a new buffer becomes ready or an overrun condition occurs.
	* Parameters:
	*
	* event: type of event notified (see enum AudioRecord::event_type).
	* user: Pointer to context for use by the callback receiver.
	* info: Pointer to optional parameter according to event type:
	* - EVENT_MORE_DATA: pointer to AudioRecord::Buffer struct. The callback must not read
	* more bytes than indicated by 'size' field and update 'size' if less bytes are
	* read.
	* - EVENT_OVERRUN: unused.
	* - EVENT_MARKER: pointer to an uin32_t containing the marker position in frames.
	* - EVENT_NEW_POS: pointer to an uin32_t containing the new position in frames.
	*/

	typedef void (callback_t)(int event, void user, void *info);

	/* Returns the minimum frame count required for the successful creation of
	* an AudioRecord object.
	* Returned status (from utils/Errors.h) can be:
	* - NO_ERROR: successful operation
	* - NO_INIT: audio server or audio hardware not initialized
	* - BAD_VALUE: unsupported configuration
	*/

	static status_t getMinFrameCount(int* frameCount,
	uint32_t sampleRate,
	int format,
	int channelCount);

	/* Constructs an uninitialized AudioRecord. No connection with
	* AudioFlinger takes place.
	*/
	AudioRecord();

	/* Creates an AudioRecord track and registers it with AudioFlinger.
	* Once created, the track needs to be started before it can be used.
	* Unspecified values are set to the audio hardware's current
	* values.
	*
	* Parameters:
	*
	* inputSource: Select the audio input to record to (e.g. AUDIO_SOURCE_DEFAULT).
	* sampleRate: Track sampling rate in Hz.
	* format: Audio format (e.g AudioSystem::PCM_16_BIT for signed
	* 16 bits per sample).
	* channels: Channel mask: see AudioSystem::audio_channels.
	* frameCount: Total size of track PCM buffer in frames. This defines the
	* latency of the track.
	* flags: A bitmask of acoustic values from enum record_flags. It enables
	* AGC, NS, and IIR.
	* cbf: Callback function. If not null, this function is called periodically
	* to provide new PCM data.
	* notificationFrames: The callback function is called each time notificationFrames PCM
	* frames are ready in record track output buffer.
	* user Context for use by the callback receiver.
	*/

	enum record_flags {
	RECORD_AGC_ENABLE = AudioSystem::AGC_ENABLE,
	RECORD_NS_ENABLE = AudioSystem::NS_ENABLE,
	RECORD_IIR_ENABLE = AudioSystem::TX_IIR_ENABLE
	};

	AudioRecord(int inputSource,
	uint32_t sampleRate = 0,
	int format = 0,
	uint32_t channels = AudioSystem::CHANNEL_IN_MONO,
	int frameCount = 0,
	uint32_t flags = 0,
	callback_t cbf = 0,
	void* user = 0,
	int notificationFrames = 0,
	int sessionId = 0);


	/* Terminates the AudioRecord and unregisters it from AudioFlinger.
	* Also destroys all resources assotiated with the AudioRecord.
	*/
	~AudioRecord();


	/* Initialize an uninitialized AudioRecord.
	* Returned status (from utils/Errors.h) can be:
	* - NO_ERROR: successful intialization
	* - INVALID_OPERATION: AudioRecord is already intitialized or record device is already in use
	* - BAD_VALUE: invalid parameter (channels, format, sampleRate...)
	* - NO_INIT: audio server or audio hardware not initialized
	* - PERMISSION_DENIED: recording is not allowed for the requesting process
	* */
	status_t set(int inputSource = 0,
	uint32_t sampleRate = 0,
	int format = 0,
	uint32_t channels = AudioSystem::CHANNEL_IN_MONO,
	int frameCount = 0,
	uint32_t flags = 0,
	callback_t cbf = 0,
	void* user = 0,
	int notificationFrames = 0,
	bool threadCanCallJava = false,
	int sessionId = 0);


	/* Result of constructing the AudioRecord. This must be checked
	* before using any AudioRecord API (except for set()), using
	* an uninitialized AudioRecord produces undefined results.
	* See set() method above for possible return codes.
	*/
	status_t initCheck() const;

	/* Returns this track's latency in milliseconds.
	* This includes the latency due to AudioRecord buffer size
	* and audio hardware driver.
	*/
	uint32_t latency() const;

	/* getters, see constructor */

	int format() const;
	int channelCount() const;
	int channels() const;
	uint32_t frameCount() const;
	int frameSize() const;
	int inputSource() const;


	/* After it's created the track is not active. Call start() to
	* make it active. If set, the callback will start being called.
	*/
	status_t start();

	/* Stop a track. If set, the callback will cease being called and
	* obtainBuffer returns STOPPED. Note that obtainBuffer() still works
	* and will fill up buffers until the pool is exhausted.
	*/
	status_t stop();
	bool stopped() const;

	/* get sample rate for this record track
	*/
	uint32_t getSampleRate();

	/* Sets marker position. When record reaches the number of frames specified,
	* a callback with event type EVENT_MARKER is called. Calling setMarkerPosition
	* with marker == 0 cancels marker notification callback.
	* If the AudioRecord has been opened with no callback function associated,
	* the operation will fail.
	*
	* Parameters:
	*
	* marker: marker position expressed in frames.
	*
	* Returned status (from utils/Errors.h) can be:
	* - NO_ERROR: successful operation
	* - INVALID_OPERATION: the AudioRecord has no callback installed.
	*/
	status_t setMarkerPosition(uint32_t marker);
	status_t getMarkerPosition(uint32_t *marker);


	/* Sets position update period. Every time the number of frames specified has been recorded,
	* a callback with event type EVENT_NEW_POS is called.
	* Calling setPositionUpdatePeriod with updatePeriod == 0 cancels new position notification
	* callback.
	* If the AudioRecord has been opened with no callback function associated,
	* the operation will fail.
	*
	* Parameters:
	*
	* updatePeriod: position update notification period expressed in frames.
	*
	* Returned status (from utils/Errors.h) can be:
	* - NO_ERROR: successful operation
	* - INVALID_OPERATION: the AudioRecord has no callback installed.
	*/
	status_t setPositionUpdatePeriod(uint32_t updatePeriod);
	status_t getPositionUpdatePeriod(uint32_t *updatePeriod);


	/* Gets record head position. The position is the total number of frames
	* recorded since record start.
	*
	* Parameters:
	*
	* position: Address where to return record head position within AudioRecord buffer.
	*
	* Returned status (from utils/Errors.h) can be:
	* - NO_ERROR: successful operation
	* - BAD_VALUE: position is NULL
	*/
	status_t getPosition(uint32_t *position);

	/* returns a handle on the audio input used by this AudioRecord.
	*
	* Parameters:
	* none.
	*
	* Returned value:
	* handle on audio hardware input
	*/
	audio_io_handle_t getInput();

	/* returns the audio session ID associated to this AudioRecord.
	*
	* Parameters:
	* none.
	*
	* Returned value:
	* AudioRecord session ID.
	*/
	int getSessionId();

	/* obtains a buffer of "frameCount" frames. The buffer must be
	* filled entirely. If the track is stopped, obtainBuffer() returns
	* STOPPED instead of NO_ERROR as long as there are buffers availlable,
	* at which point NO_MORE_BUFFERS is returned.
	* Buffers will be returned until the pool (buffercount())
	* is exhausted, at which point obtainBuffer() will either block
	* or return WOULD_BLOCK depending on the value of the "blocking"
	* parameter.
	*/

	enum {
	NO_MORE_BUFFERS = 0x80000001,
	STOPPED = 1
	};

	status_t obtainBuffer(Buffer* audioBuffer, int32_t waitCount);
	void releaseBuffer(Buffer* audioBuffer);


	/* As a convenience we provide a read() interface to the audio buffer.
	* This is implemented on top of lockBuffer/unlockBuffer.
	*/
	ssize_t read(void* buffer, size_t size);

	/* Return the amount of input frames lost in the audio driver since the last call of this function.
	* Audio driver is expected to reset the value to 0 and restart counting upon returning the current value by this function call.
	* Such loss typically occurs when the user space process is blocked longer than the capacity of audio driver buffers.
	* Unit: the number of input audio frames
	*/
	unsigned int getInputFramesLost();

	private:
	/* copying audio tracks is not allowed */
	AudioRecord(const AudioRecord& other);
	AudioRecord& operator = (const AudioRecord& other);

	/* a small internal class to handle the callback */
	class ClientRecordThread : public Thread
	{
	public:
	ClientRecordThread(AudioRecord& receiver, bool bCanCallJava = false);
	private:
	friend class AudioRecord;
	virtual bool threadLoop();
	virtual status_t readyToRun() { return NO_ERROR; }
	virtual void onFirstRef() {}
	AudioRecord& mReceiver;
	Mutex mLock;
	};

	bool processAudioBuffer(const sp<ClientRecordThread>& thread);
	status_t openRecord_l(uint32_t sampleRate,
	int format,
	int channelCount,
	int frameCount,
	uint32_t flags,
	audio_io_handle_t input);
	audio_io_handle_t getInput_l();
	status_t restoreRecord_l(audio_track_cblk_t*& cblk);

	sp<IAudioRecord> mAudioRecord;
	sp<IMemory> mCblkMemory;
	sp<ClientRecordThread> mClientRecordThread;
	Mutex mLock;

	uint32_t mFrameCount;

	audio_track_cblk_t* mCblk;
	uint8_t mFormat;
	uint8_t mChannelCount;
	uint8_t mInputSource;
	uint8_t mReserved;
	status_t mStatus;
	uint32_t mLatency;

	volatile int32_t mActive;

	callback_t mCbf;
	void* mUserData;
	uint32_t mNotificationFrames;
	uint32_t mRemainingFrames;
	uint32_t mMarkerPosition;
	bool mMarkerReached;
	uint32_t mNewPosition;
	uint32_t mUpdatePeriod;
	uint32_t mFlags;
	uint32_t mChannels;
	audio_io_handle_t mInput;
	int mSessionId;
	};

	}; // namespace android

	#endif /AUDIORECORD_H_/