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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/AudioSystem.h>
#include <media/ToneGenerator.h>
#include <utils/String8.h>
#include <hardware_legacy/AudioSystemLegacy.h>
#include <hardware/audio_policy.h>
namespace android_audio_legacy {
using android::Vector;
using android::String8;
using android::ToneGenerator;
// ----------------------------------------------------------------------------
// The AudioPolicyInterface and AudioPolicyClientInterface classes define the communication interfaces
// between the platform specific audio policy manager and Android generic audio policy manager.
// The platform specific audio policy manager must implement methods of the AudioPolicyInterface class.
// This implementation makes use of the AudioPolicyClientInterface to control the activity and
// configuration of audio input and output streams.
// The platform specific audio policy manager is in charge of the audio routing and volume control
// policies for a given platform.
// The main roles of this module are:
// - keep track of current system state (removable device connections, phone state, user requests...).
// System state changes and user actions are notified to audio policy manager with methods of the AudioPolicyInterface.
// - process getOutput() queries received when AudioTrack objects are created: Those queries
// return a handler on an output that has been selected, configured and opened by the audio policy manager and that
// must be used by the AudioTrack when registering to the AudioFlinger with the createTrack() method.
// When the AudioTrack object is released, a putOutput() query is received and the audio policy manager can decide
// to close or reconfigure the output depending on other streams using this output and current system state.
// - similarly process getInput() and putInput() queries received from AudioRecord objects and configure audio inputs.
// - process volume control requests: the stream volume is converted from an index value (received from UI) to a float value
// applicable to each output as a function of platform specific settings and current output route (destination device). It
// also make sure that streams are not muted if not allowed (e.g. camera shutter sound in some countries).
// The platform specific audio policy manager is provided as a shared library by platform vendors (as for
// and is linked with
// Audio Policy Manager Interface
class AudioPolicyInterface
virtual ~AudioPolicyInterface() {}
// configuration functions
// indicate a change in device connection status
virtual status_t setDeviceConnectionState(audio_devices_t device,
AudioSystem::device_connection_state state,
const char *device_address) = 0;
// retrieve a device connection status
virtual AudioSystem::device_connection_state getDeviceConnectionState(audio_devices_t device,
const char *device_address) = 0;
// indicate a change in phone state. Valid phones states are defined by AudioSystem::audio_mode
virtual void setPhoneState(int state) = 0;
// force using a specific device category for the specified usage
virtual void setForceUse(AudioSystem::force_use usage, AudioSystem::forced_config config) = 0;
// retrieve current device category forced for a given usage
virtual AudioSystem::forced_config getForceUse(AudioSystem::force_use usage) = 0;
// set a system property (e.g. camera sound always audible)
virtual void setSystemProperty(const char* property, const char* value) = 0;
// check proper initialization
virtual status_t initCheck() = 0;
// Audio routing query functions
// request an output appropriate for playback of the supplied stream type and parameters
virtual audio_io_handle_t getOutput(AudioSystem::stream_type stream,
uint32_t samplingRate,
audio_format_t format,
audio_channel_mask_t channelMask,
AudioSystem::output_flags flags,
const audio_offload_info_t *offloadInfo) = 0;
// indicates to the audio policy manager that the output starts being used by corresponding stream.
virtual status_t startOutput(audio_io_handle_t output,
AudioSystem::stream_type stream,
audio_session_t session = AUDIO_SESSION_NONE) = 0;
// indicates to the audio policy manager that the output stops being used by corresponding stream.
virtual status_t stopOutput(audio_io_handle_t output,
AudioSystem::stream_type stream,
audio_session_t session = AUDIO_SESSION_NONE) = 0;
// releases the output.
virtual void releaseOutput(audio_io_handle_t output) = 0;
// request an input appropriate for record from the supplied device with supplied parameters.
virtual audio_io_handle_t getInput(int inputSource,
uint32_t samplingRate,
audio_format_t format,
audio_channel_mask_t channelMask,
AudioSystem::audio_in_acoustics acoustics) = 0;
// indicates to the audio policy manager that the input starts being used.
virtual status_t startInput(audio_io_handle_t input) = 0;
// indicates to the audio policy manager that the input stops being used.
virtual status_t stopInput(audio_io_handle_t input) = 0;
// releases the input.
virtual void releaseInput(audio_io_handle_t input) = 0;
// volume control functions
// initialises stream volume conversion parameters by specifying volume index range.
virtual void initStreamVolume(AudioSystem::stream_type stream,
int indexMin,
int indexMax) = 0;
// sets the new stream volume at a level corresponding to the supplied index for the
// supplied device. By convention, specifying AUDIO_DEVICE_OUT_DEFAULT means
// setting volume for all devices
virtual status_t setStreamVolumeIndex(AudioSystem::stream_type stream,
int index,
audio_devices_t device) = 0;
// retrieve current volume index for the specified stream and the
// specified device. By convention, specifying AUDIO_DEVICE_OUT_DEFAULT means
// querying the volume of the active device.
virtual status_t getStreamVolumeIndex(AudioSystem::stream_type stream,
int *index,
audio_devices_t device) = 0;
// return the strategy corresponding to a given stream type
virtual uint32_t getStrategyForStream(AudioSystem::stream_type stream) = 0;
// return the enabled output devices for the given stream type
virtual audio_devices_t getDevicesForStream(AudioSystem::stream_type stream) = 0;
// Audio effect management
virtual audio_io_handle_t getOutputForEffect(const effect_descriptor_t *desc) = 0;
virtual status_t registerEffect(const effect_descriptor_t *desc,
audio_io_handle_t io,
uint32_t strategy,
audio_session_t session,
int id) = 0;
virtual status_t unregisterEffect(int id) = 0;
virtual status_t setEffectEnabled(int id, bool enabled) = 0;
virtual bool isStreamActive(int stream, uint32_t inPastMs = 0) const = 0;
virtual bool isStreamActiveRemotely(int stream, uint32_t inPastMs = 0) const = 0;
virtual bool isSourceActive(audio_source_t source) const = 0;
//dump state
virtual status_t dump(int fd) = 0;
virtual bool isOffloadSupported(const audio_offload_info_t& offloadInfo) = 0;
// Audio Policy client Interface
class AudioPolicyClientInterface
virtual ~AudioPolicyClientInterface() {}
// Audio HW module functions
// loads a HW module.
virtual audio_module_handle_t loadHwModule(const char *name) = 0;
// Audio output Control functions
// opens an audio output with the requested parameters. The parameter values can indicate to use the default values
// in case the audio policy manager has no specific requirements for the output being opened.
// When the function returns, the parameter values reflect the actual values used by the audio hardware output stream.
// The audio policy manager can check if the proposed parameters are suitable or not and act accordingly.
virtual audio_io_handle_t openOutput(audio_module_handle_t module,
audio_devices_t *pDevices,
uint32_t *pSamplingRate,
audio_format_t *pFormat,
audio_channel_mask_t *pChannelMask,
uint32_t *pLatencyMs,
audio_output_flags_t flags,
const audio_offload_info_t *offloadInfo = NULL) = 0;
// creates a special output that is duplicated to the two outputs passed as arguments. The duplication is performed by
// a special mixer thread in the AudioFlinger.
virtual audio_io_handle_t openDuplicateOutput(audio_io_handle_t output1, audio_io_handle_t output2) = 0;
// closes the output stream
virtual status_t closeOutput(audio_io_handle_t output) = 0;
// suspends the output. When an output is suspended, the corresponding audio hardware output stream is placed in
// standby and the AudioTracks attached to the mixer thread are still processed but the output mix is discarded.
virtual status_t suspendOutput(audio_io_handle_t output) = 0;
// restores a suspended output.
virtual status_t restoreOutput(audio_io_handle_t output) = 0;
// Audio input Control functions
// opens an audio input
virtual audio_io_handle_t openInput(audio_module_handle_t module,
audio_devices_t *pDevices,
uint32_t *pSamplingRate,
audio_format_t *pFormat,
audio_channel_mask_t *pChannelMask) = 0;
// closes an audio input
virtual status_t closeInput(audio_io_handle_t input) = 0;
// misc control functions
// set a stream volume for a particular output. For the same user setting, a given stream type can have different volumes
// for each output (destination device) it is attached to.
virtual status_t setStreamVolume(AudioSystem::stream_type stream, float volume, audio_io_handle_t output, int delayMs = 0) = 0;
// invalidate a stream type, causing a reroute to an unspecified new output
virtual status_t invalidateStream(AudioSystem::stream_type stream) = 0;
// function enabling to send proprietary informations directly from audio policy manager to audio hardware interface.
virtual void setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs, int delayMs = 0) = 0;
// function enabling to receive proprietary informations directly from audio hardware interface to audio policy manager.
virtual String8 getParameters(audio_io_handle_t ioHandle, const String8& keys) = 0;
// request the playback of a tone on the specified stream: used for instance to replace notification sounds when playing
// over a telephony device during a phone call.
virtual status_t startTone(ToneGenerator::tone_type tone, AudioSystem::stream_type stream) = 0;
virtual status_t stopTone() = 0;
// set down link audio volume.
virtual status_t setVoiceVolume(float volume, int delayMs = 0) = 0;
// move effect to the specified output
virtual status_t moveEffects(audio_session_t session,
audio_io_handle_t srcOutput,
audio_io_handle_t dstOutput) = 0;
extern "C" AudioPolicyInterface* createAudioPolicyManager(AudioPolicyClientInterface *clientInterface);
extern "C" void destroyAudioPolicyManager(AudioPolicyInterface *interface);
}; // namespace android