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* Copyright (C) 2009 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <media/IAudioPolicyService.h>
#include <media/ToneGenerator.h>
#include <utils/Vector.h>
#include <binder/BinderService.h>
#include <system/audio.h>
#include <system/audio_policy.h>
#include <hardware/audio_policy.h>
namespace android {
class String8;
// ----------------------------------------------------------------------------
class AudioPolicyService :
public BinderService<AudioPolicyService>,
public BnAudioPolicyService,
// public AudioPolicyClientInterface,
public IBinder::DeathRecipient
friend class BinderService<AudioPolicyService>;
// for BinderService
static const char *getServiceName() { return "media.audio_policy"; }
virtual status_t dump(int fd, const Vector<String16>& args);
// BnAudioPolicyService (see AudioPolicyInterface for method descriptions)
virtual status_t setDeviceConnectionState(audio_devices_t device,
audio_policy_dev_state_t state,
const char *device_address);
virtual audio_policy_dev_state_t getDeviceConnectionState(
audio_devices_t device,
const char *device_address);
virtual status_t setPhoneState(int state);
virtual status_t setRingerMode(uint32_t mode, uint32_t mask);
virtual status_t setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config);
virtual audio_policy_forced_cfg_t getForceUse(audio_policy_force_use_t usage);
virtual audio_io_handle_t getOutput(audio_stream_type_t stream,
uint32_t samplingRate = 0,
uint32_t format = AUDIO_FORMAT_DEFAULT,
uint32_t channels = 0,
audio_policy_output_flags_t flags =
virtual status_t startOutput(audio_io_handle_t output,
audio_stream_type_t stream,
int session = 0);
virtual status_t stopOutput(audio_io_handle_t output,
audio_stream_type_t stream,
int session = 0);
virtual void releaseOutput(audio_io_handle_t output);
virtual audio_io_handle_t getInput(int inputSource,
uint32_t samplingRate = 0,
uint32_t format = AUDIO_FORMAT_DEFAULT,
uint32_t channels = 0,
audio_in_acoustics_t acoustics =
virtual status_t startInput(audio_io_handle_t input);
virtual status_t stopInput(audio_io_handle_t input);
virtual void releaseInput(audio_io_handle_t input);
virtual status_t initStreamVolume(audio_stream_type_t stream,
int indexMin,
int indexMax);
virtual status_t setStreamVolumeIndex(audio_stream_type_t stream, int index);
virtual status_t getStreamVolumeIndex(audio_stream_type_t stream, int *index);
virtual uint32_t getStrategyForStream(audio_stream_type_t stream);
virtual uint32_t getDevicesForStream(audio_stream_type_t stream);
virtual audio_io_handle_t getOutputForEffect(effect_descriptor_t *desc);
virtual status_t registerEffect(effect_descriptor_t *desc,
audio_io_handle_t output,
uint32_t strategy,
int session,
int id);
virtual status_t unregisterEffect(int id);
virtual bool isStreamActive(int stream, uint32_t inPastMs = 0) const;
virtual status_t onTransact(
uint32_t code,
const Parcel& data,
Parcel* reply,
uint32_t flags);
// IBinder::DeathRecipient
virtual void binderDied(const wp<IBinder>& who);
// Helpers for the struct audio_policy_service_ops implementation.
// This is used by the audio policy manager for certain operations that
// are implemented by the policy service.
virtual void setParameters(audio_io_handle_t ioHandle,
const char *keyValuePairs,
int delayMs);
virtual status_t setStreamVolume(audio_stream_type_t stream,
float volume,
audio_io_handle_t output,
int delayMs = 0);
virtual status_t startTone(audio_policy_tone_t tone, audio_stream_type_t stream);
virtual status_t stopTone();
virtual status_t setVoiceVolume(float volume, int delayMs = 0);
virtual ~AudioPolicyService();
status_t dumpInternals(int fd);
// Thread used for tone playback and to send audio config commands to audio flinger
// For tone playback, using a separate thread is necessary to avoid deadlock with mLock because startTone()
// and stopTone() are normally called with mLock locked and requesting a tone start or stop will cause
// calls to AudioPolicyService and an attempt to lock mLock.
// For audio config commands, it is necessary because audio flinger requires that the calling process (user)
// has permission to modify audio settings.
class AudioCommandThread : public Thread {
class AudioCommand;
// commands for tone AudioCommand
enum {
AudioCommandThread (String8 name);
virtual ~AudioCommandThread();
status_t dump(int fd);
// Thread virtuals
virtual void onFirstRef();
virtual bool threadLoop();
void exit();
void startToneCommand(int type = 0, int stream = 0);
void stopToneCommand();
status_t volumeCommand(int stream, float volume, int output, int delayMs = 0);
status_t parametersCommand(int ioHandle, const char *keyValuePairs, int delayMs = 0);
status_t voiceVolumeCommand(float volume, int delayMs = 0);
void insertCommand_l(AudioCommand *command, int delayMs = 0);
// descriptor for requested tone playback event
class AudioCommand {
: mCommand(-1) {}
void dump(char* buffer, size_t size);
int mCommand; // START_TONE, STOP_TONE ...
nsecs_t mTime; // time stamp
Condition mCond; // condition for status return
status_t mStatus; // command status
bool mWaitStatus; // true if caller is waiting for status
void *mParam; // command parameter (ToneData, VolumeData, ParametersData)
class ToneData {
int mType; // tone type (START_TONE only)
int mStream; // stream type (START_TONE only)
class VolumeData {
int mStream;
float mVolume;
int mIO;
class ParametersData {
int mIO;
String8 mKeyValuePairs;
class VoiceVolumeData {
float mVolume;
Mutex mLock;
Condition mWaitWorkCV;
Vector <AudioCommand *> mAudioCommands; // list of pending commands
ToneGenerator *mpToneGenerator; // the tone generator
AudioCommand mLastCommand; // last processed command (used by dump)
String8 mName; // string used by wake lock fo delayed commands
// Internal dump utilities.
status_t dumpPermissionDenial(int fd);
mutable Mutex mLock; // prevents concurrent access to AudioPolicy manager functions changing
// device connection state or routing
sp <AudioCommandThread> mAudioCommandThread; // audio commands thread
sp <AudioCommandThread> mTonePlaybackThread; // tone playback thread
struct audio_policy_device *mpAudioPolicyDev;
struct audio_policy *mpAudioPolicy;
}; // namespace android