--- /dev/null
+/*
+ * 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
+ *
+ * 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.
+ */
+
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <utils/Timers.h>
+#include <utils/Errors.h>
+#include <utils/KeyedVector.h>
+#include <hardware_legacy/AudioPolicyInterface.h>
+
+
+namespace android {
+
+// ----------------------------------------------------------------------------
+
+#define MAX_DEVICE_ADDRESS_LEN 20
+// Attenuation applied to STRATEGY_SONIFICATION streams when a headset is connected: 6dB
+#define SONIFICATION_HEADSET_VOLUME_FACTOR 0.5
+// Min volume for STRATEGY_SONIFICATION streams when limited by music volume: -36dB
+#define SONIFICATION_HEADSET_VOLUME_MIN 0.016
+// Time in seconds during which we consider that music is still active after a music
+// track was stopped - see computeVolume()
+#define SONIFICATION_HEADSET_MUSIC_DELAY 5
+
+#define NUM_TEST_OUTPUTS 5
+
+// ----------------------------------------------------------------------------
+// AudioPolicyManagerBase implements audio policy manager behavior common to all platforms.
+// Each platform must implement an AudioPolicyManager class derived from AudioPolicyManagerBase
+// and override methods for which the platfrom specific behavior differs from the implementation
+// in AudioPolicyManagerBase. Even if no specific behavior is required, the AudioPolicyManager
+// class must be implemented as well as the class factory function createAudioPolicyManager()
+// and provided in a shared library libaudiopolicy.so.
+// ----------------------------------------------------------------------------
+
+class AudioPolicyManagerBase: public AudioPolicyInterface
+#ifdef AUDIO_POLICY_TEST
+ , public Thread
+#endif //AUDIO_POLICY_TEST
+{
+
+public:
+ AudioPolicyManagerBase(AudioPolicyClientInterface *clientInterface);
+ virtual ~AudioPolicyManagerBase();
+
+ // AudioPolicyInterface
+ virtual status_t setDeviceConnectionState(AudioSystem::audio_devices device,
+ AudioSystem::device_connection_state state,
+ const char *device_address);
+ virtual AudioSystem::device_connection_state getDeviceConnectionState(AudioSystem::audio_devices device,
+ const char *device_address);
+ virtual void setPhoneState(int state);
+ virtual void setRingerMode(uint32_t mode, uint32_t mask);
+ virtual void setForceUse(AudioSystem::force_use usage, AudioSystem::forced_config config);
+ virtual AudioSystem::forced_config getForceUse(AudioSystem::force_use usage);
+ virtual void setSystemProperty(const char* property, const char* value);
+ virtual audio_io_handle_t getOutput(AudioSystem::stream_type stream,
+ uint32_t samplingRate,
+ uint32_t format,
+ uint32_t channels,
+ AudioSystem::output_flags flags);
+ virtual status_t startOutput(audio_io_handle_t output, AudioSystem::stream_type stream);
+ virtual status_t stopOutput(audio_io_handle_t output, AudioSystem::stream_type stream);
+ virtual void releaseOutput(audio_io_handle_t output);
+ virtual audio_io_handle_t getInput(int inputSource,
+ uint32_t samplingRate,
+ uint32_t format,
+ uint32_t channels,
+ AudioSystem::audio_in_acoustics acoustics);
+ // indicates to the audio policy manager that the input starts being used.
+ virtual status_t startInput(audio_io_handle_t input);
+ // indicates to the audio policy manager that the input stops being used.
+ virtual status_t stopInput(audio_io_handle_t input);
+ virtual void releaseInput(audio_io_handle_t input);
+ virtual void initStreamVolume(AudioSystem::stream_type stream,
+ int indexMin,
+ int indexMax);
+ virtual status_t setStreamVolumeIndex(AudioSystem::stream_type stream, int index);
+ virtual status_t getStreamVolumeIndex(AudioSystem::stream_type stream, int *index);
+
+ virtual status_t dump(int fd);
+
+protected:
+
+ enum routing_strategy {
+ STRATEGY_MEDIA,
+ STRATEGY_PHONE,
+ STRATEGY_SONIFICATION,
+ STRATEGY_DTMF,
+ NUM_STRATEGIES
+ };
+
+ // descriptor for audio outputs. Used to maintain current configuration of each opened audio output
+ // and keep track of the usage of this output by each audio stream type.
+ class AudioOutputDescriptor
+ {
+ public:
+ AudioOutputDescriptor();
+
+ status_t dump(int fd);
+
+ uint32_t device();
+ void changeRefCount(AudioSystem::stream_type, int delta);
+ uint32_t refCount();
+ uint32_t strategyRefCount(routing_strategy strategy);
+ bool isUsedByStrategy(routing_strategy strategy) { return (strategyRefCount(strategy) != 0);}
+ bool isDuplicated() { return (mOutput1 != NULL && mOutput2 != NULL); }
+
+ audio_io_handle_t mId; // output handle
+ uint32_t mSamplingRate; //
+ uint32_t mFormat; //
+ uint32_t mChannels; // output configuration
+ uint32_t mLatency; //
+ AudioSystem::output_flags mFlags; //
+ uint32_t mDevice; // current device this output is routed to
+ uint32_t mRefCount[AudioSystem::NUM_STREAM_TYPES]; // number of streams of each type using this output
+ AudioOutputDescriptor *mOutput1; // used by duplicated outputs: first output
+ AudioOutputDescriptor *mOutput2; // used by duplicated outputs: second output
+ float mCurVolume[AudioSystem::NUM_STREAM_TYPES]; // current stream volume
+ int mMuteCount[AudioSystem::NUM_STREAM_TYPES]; // mute request counter
+ };
+
+ // descriptor for audio inputs. Used to maintain current configuration of each opened audio input
+ // and keep track of the usage of this input.
+ class AudioInputDescriptor
+ {
+ public:
+ AudioInputDescriptor();
+
+ status_t dump(int fd);
+
+ uint32_t mSamplingRate; //
+ uint32_t mFormat; // input configuration
+ uint32_t mChannels; //
+ AudioSystem::audio_in_acoustics mAcoustics; //
+ uint32_t mDevice; // current device this input is routed to
+ uint32_t mRefCount; // number of AudioRecord clients using this output
+ int mInputSource; // input source selected by application (mediarecorder.h)
+ };
+
+ // stream descriptor used for volume control
+ class StreamDescriptor
+ {
+ public:
+ StreamDescriptor()
+ : mIndexMin(0), mIndexMax(1), mIndexCur(1), mCanBeMuted(true) {}
+
+ void dump(char* buffer, size_t size);
+
+ int mIndexMin; // min volume index
+ int mIndexMax; // max volume index
+ int mIndexCur; // current volume index
+ bool mCanBeMuted; // true is the stream can be muted
+ };
+
+ void addOutput(audio_io_handle_t id, AudioOutputDescriptor *outputDesc);
+
+ // return the strategy corresponding to a given stream type
+ static routing_strategy getStrategy(AudioSystem::stream_type stream);
+ // return appropriate device for streams handled by the specified strategy according to current
+ // phone state, connected devices...
+ // if fromCache is true, the device is returned from mDeviceForStrategy[], otherwise it is determined
+ // by current state (device connected, phone state, force use, a2dp output...)
+ // This allows to:
+ // 1 speed up process when the state is stable (when starting or stopping an output)
+ // 2 access to either current device selection (fromCache == true) or
+ // "future" device selection (fromCache == false) when called from a context
+ // where conditions are changing (setDeviceConnectionState(), setPhoneState()...) AND
+ // before updateDeviceForStrategy() is called.
+ virtual uint32_t getDeviceForStrategy(routing_strategy strategy, bool fromCache = true);
+ // change the route of the specified output
+ void setOutputDevice(audio_io_handle_t output, uint32_t device, bool force = false, int delayMs = 0);
+ // select input device corresponding to requested audio source
+ virtual uint32_t getDeviceForInputSource(int inputSource);
+ // return io handle of active input or 0 if no input is active
+ audio_io_handle_t getActiveInput();
+ // compute the actual volume for a given stream according to the requested index and a particular
+ // device
+ float computeVolume(int stream, int index, audio_io_handle_t output, uint32_t device);
+ // check that volume change is permitted, compute and send new volume to audio hardware
+ status_t checkAndSetVolume(int stream, int index, audio_io_handle_t output, uint32_t device, int delayMs = 0, bool force = false);
+ // apply all stream volumes to the specified output and device
+ void applyStreamVolumes(audio_io_handle_t output, uint32_t device, int delayMs = 0);
+ // Mute or unmute all streams handled by the specified strategy on the specified output
+ void setStrategyMute(routing_strategy strategy, bool on, audio_io_handle_t output, int delayMs = 0);
+ // Mute or unmute the stream on the specified output
+ void setStreamMute(int stream, bool on, audio_io_handle_t output, int delayMs = 0);
+ // handle special cases for sonification strategy while in call: mute streams or replace by
+ // a special tone in the device used for communication
+ void handleIncallSonification(int stream, bool starting, bool stateChange);
+ // true is current platform implements a back microphone
+ virtual bool hasBackMicrophone() const { return false; }
+
+#ifdef WITH_A2DP
+ // true is current platform supports suplication of notifications and ringtones over A2DP output
+ virtual bool a2dpUsedForSonification() const { return true; }
+ status_t handleA2dpConnection(AudioSystem::audio_devices device,
+ const char *device_address);
+ status_t handleA2dpDisconnection(AudioSystem::audio_devices device,
+ const char *device_address);
+ void closeA2dpOutputs();
+ // checks and if necessary changes output (a2dp, duplicated or hardware) used for all strategies.
+ // must be called every time a condition that affects the output choice for a given strategy is
+ // changed: connected device, phone state, force use...
+ // Must be called before updateDeviceForStrategy()
+ void checkOutputForStrategy(routing_strategy strategy, uint32_t &newDevice);
+ // Same as checkOutputForStrategy() but for a all strategies in order of priority
+ void checkOutputForAllStrategies(uint32_t &newDevice);
+
+#endif
+ // selects the most appropriate device on output for current state
+ // must be called every time a condition that affects the device choice for a given output is
+ // changed: connected device, phone state, force use, output start, output stop..
+ // see getDeviceForStrategy() for the use of fromCache parameter
+ uint32_t getNewDevice(audio_io_handle_t output, bool fromCache = true);
+ // updates cache of device used by all strategies (mDeviceForStrategy[])
+ // must be called every time a condition that affects the device choice for a given strategy is
+ // changed: connected device, phone state, force use...
+ // cached values are used by getDeviceForStrategy() if parameter fromCache is true.
+ // Must be called after checkOutputForAllStrategies()
+ void updateDeviceForStrategy();
+
+#ifdef AUDIO_POLICY_TEST
+ virtual bool threadLoop();
+ void exit();
+ int testOutputIndex(audio_io_handle_t output);
+#endif //AUDIO_POLICY_TEST
+
+ AudioPolicyClientInterface *mpClientInterface; // audio policy client interface
+ audio_io_handle_t mHardwareOutput; // hardware output handler
+ audio_io_handle_t mA2dpOutput; // A2DP output handler
+ audio_io_handle_t mDuplicatedOutput; // duplicated output handler: outputs to hardware and A2DP.
+
+ KeyedVector<audio_io_handle_t, AudioOutputDescriptor *> mOutputs; // list of output descriptors
+ KeyedVector<audio_io_handle_t, AudioInputDescriptor *> mInputs; // list of input descriptors
+ uint32_t mAvailableOutputDevices; // bit field of all available output devices
+ uint32_t mAvailableInputDevices; // bit field of all available input devices
+ int mPhoneState; // current phone state
+ uint32_t mRingerMode; // current ringer mode
+ AudioSystem::forced_config mForceUse[AudioSystem::NUM_FORCE_USE]; // current forced use configuration
+
+ StreamDescriptor mStreams[AudioSystem::NUM_STREAM_TYPES]; // stream descriptors for volume control
+ String8 mA2dpDeviceAddress; // A2DP device MAC address
+ String8 mScoDeviceAddress; // SCO device MAC address
+ nsecs_t mMusicStopTime; // time when last music stream was stopped
+ bool mLimitRingtoneVolume; // limit ringtone volume to music volume if headset connected
+ uint32_t mDeviceForStrategy[NUM_STRATEGIES];
+
+#ifdef AUDIO_POLICY_TEST
+ Mutex mLock;
+ Condition mWaitWorkCV;
+
+ int mCurOutput;
+ bool mDirectOutput;
+ audio_io_handle_t mTestOutputs[NUM_TEST_OUTPUTS];
+ int mTestInput;
+ uint32_t mTestDevice;
+ uint32_t mTestSamplingRate;
+ uint32_t mTestFormat;
+ uint32_t mTestChannels;
+ uint32_t mTestLatencyMs;
+#endif //AUDIO_POLICY_TEST
+};
+
+};
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