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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/AudioPolicy.h>
#include <utils/String8.h>
namespace android {
// ----------------------------------------------------------------------------
// 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
typedef enum {
API_INPUT_LEGACY = 0,// e.g. audio recording from a microphone
API_INPUT_MIX_CAPTURE,// used for "remote submix" legacy mode (no DAP),
// capture of the media to play it remotely
API_INPUT_MIX_EXT_POLICY_REROUTE,// used for platform audio rerouting, where mixes are
// handled by external and dynamically installed
// policies which reroute audio mixes
API_INPUT_MIX_PUBLIC_CAPTURE_PLAYBACK, // used for playback capture with a MediaProjection
API_INPUT_TELEPHONY_RX, // used for capture from telephony RX path
} input_type_t;
virtual ~AudioPolicyInterface() {}
// configuration functions
// indicate a change in device connection status
virtual status_t setDeviceConnectionState(audio_devices_t device,
audio_policy_dev_state_t state,
const char *device_address,
const char *device_name,
audio_format_t encodedFormat) = 0;
// retrieve a device connection status
virtual audio_policy_dev_state_t getDeviceConnectionState(audio_devices_t device,
const char *device_address) = 0;
// indicate a change in device configuration
virtual status_t handleDeviceConfigChange(audio_devices_t device,
const char *device_address,
const char *device_name,
audio_format_t encodedFormat) = 0;
// indicate a change in phone state. Valid phones states are defined by audio_mode_t
virtual void setPhoneState(audio_mode_t state) = 0;
// force using a specific device category for the specified usage
virtual void setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config) = 0;
// retrieve current device category forced for a given usage
virtual audio_policy_forced_cfg_t getForceUse(audio_policy_force_use_t 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(audio_stream_type_t stream) = 0;
virtual status_t getOutputForAttr(const audio_attributes_t *attr,
audio_io_handle_t *output,
audio_session_t session,
audio_stream_type_t *stream,
uid_t uid,
const audio_config_t *config,
audio_output_flags_t *flags,
audio_port_handle_t *selectedDeviceId,
audio_port_handle_t *portId,
std::vector<audio_io_handle_t> *secondaryOutputs) = 0;
// indicates to the audio policy manager that the output starts being used by corresponding stream.
virtual status_t startOutput(audio_port_handle_t portId) = 0;
// indicates to the audio policy manager that the output stops being used by corresponding stream.
virtual status_t stopOutput(audio_port_handle_t portId) = 0;
// releases the output.
virtual void releaseOutput(audio_port_handle_t portId) = 0;
// request an input appropriate for record from the supplied device with supplied parameters.
virtual status_t getInputForAttr(const audio_attributes_t *attr,
audio_io_handle_t *input,
audio_unique_id_t riid,
audio_session_t session,
uid_t uid,
const audio_config_base_t *config,
audio_input_flags_t flags,
audio_port_handle_t *selectedDeviceId,
input_type_t *inputType,
audio_port_handle_t *portId) = 0;
// indicates to the audio policy manager that the input starts being used.
virtual status_t startInput(audio_port_handle_t portId) = 0;
// indicates to the audio policy manager that the input stops being used.
virtual status_t stopInput(audio_port_handle_t portId) = 0;
// releases the input.
virtual void releaseInput(audio_port_handle_t portId) = 0;
// volume control functions
// initialises stream volume conversion parameters by specifying volume index range.
virtual void initStreamVolume(audio_stream_type_t 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_FOR_VOLUME means
// setting volume for all devices
virtual status_t setStreamVolumeIndex(audio_stream_type_t 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_FOR_VOLUME means
// querying the volume of the active device.
virtual status_t getStreamVolumeIndex(audio_stream_type_t stream,
int *index,
audio_devices_t device) = 0;
virtual status_t setVolumeIndexForAttributes(const audio_attributes_t &attr,
int index,
audio_devices_t device) = 0;
virtual status_t getVolumeIndexForAttributes(const audio_attributes_t &attr,
int &index,
audio_devices_t device) = 0;
virtual status_t getMaxVolumeIndexForAttributes(const audio_attributes_t &attr,
int &index) = 0;
virtual status_t getMinVolumeIndexForAttributes(const audio_attributes_t &attr,
int &index) = 0;
// return the strategy corresponding to a given stream type
virtual uint32_t getStrategyForStream(audio_stream_type_t stream) = 0;
// return the enabled output devices for the given stream type
virtual audio_devices_t getDevicesForStream(audio_stream_type_t 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,
int session,
int id) = 0;
virtual status_t unregisterEffect(int id) = 0;
virtual status_t setEffectEnabled(int id, bool enabled) = 0;
virtual status_t moveEffectsToIo(const std::vector<int>& ids, audio_io_handle_t io) = 0;
virtual bool isStreamActive(audio_stream_type_t stream, uint32_t inPastMs = 0) const = 0;
virtual bool isStreamActiveRemotely(audio_stream_type_t 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 status_t setAllowedCapturePolicy(uid_t uid, audio_flags_mask_t flags) = 0;
virtual bool isOffloadSupported(const audio_offload_info_t& offloadInfo) = 0;
virtual bool isDirectOutputSupported(const audio_config_base_t& config,
const audio_attributes_t& attributes) = 0;
virtual status_t listAudioPorts(audio_port_role_t role,
audio_port_type_t type,
unsigned int *num_ports,
struct audio_port *ports,
unsigned int *generation) = 0;
virtual status_t getAudioPort(struct audio_port *port) = 0;
virtual status_t createAudioPatch(const struct audio_patch *patch,
audio_patch_handle_t *handle,
uid_t uid) = 0;
virtual status_t releaseAudioPatch(audio_patch_handle_t handle,
uid_t uid) = 0;
virtual status_t listAudioPatches(unsigned int *num_patches,
struct audio_patch *patches,
unsigned int *generation) = 0;
virtual status_t setAudioPortConfig(const struct audio_port_config *config) = 0;
virtual void releaseResourcesForUid(uid_t uid) = 0;
virtual status_t acquireSoundTriggerSession(audio_session_t *session,
audio_io_handle_t *ioHandle,
audio_devices_t *device) = 0;
virtual status_t releaseSoundTriggerSession(audio_session_t session) = 0;
virtual status_t registerPolicyMixes(const Vector<AudioMix>& mixes) = 0;
virtual status_t unregisterPolicyMixes(Vector<AudioMix> mixes) = 0;
virtual status_t setUidDeviceAffinities(uid_t uid, const Vector<AudioDeviceTypeAddr>& devices)
= 0;
virtual status_t removeUidDeviceAffinities(uid_t uid) = 0;
virtual status_t startAudioSource(const struct audio_port_config *source,
const audio_attributes_t *attributes,
audio_port_handle_t *portId,
uid_t uid) = 0;
virtual status_t stopAudioSource(audio_port_handle_t portId) = 0;
virtual status_t setMasterMono(bool mono) = 0;
virtual status_t getMasterMono(bool *mono) = 0;
virtual float getStreamVolumeDB(
audio_stream_type_t stream, int index, audio_devices_t device) = 0;
virtual status_t getSurroundFormats(unsigned int *numSurroundFormats,
audio_format_t *surroundFormats,
bool *surroundFormatsEnabled,
bool reported) = 0;
virtual status_t setSurroundFormatEnabled(audio_format_t audioFormat, bool enabled) = 0;
virtual bool isHapticPlaybackSupported() = 0;
virtual status_t getHwOffloadEncodingFormatsSupportedForA2DP(
std::vector<audio_format_t> *formats) = 0;
virtual void setAppState(uid_t uid, app_state_t state) = 0;
virtual status_t listAudioProductStrategies(AudioProductStrategyVector &strategies) = 0;
virtual status_t getProductStrategyFromAudioAttributes(const AudioAttributes &aa,
product_strategy_t &productStrategy) = 0;
virtual status_t listAudioVolumeGroups(AudioVolumeGroupVector &groups) = 0;
virtual status_t getVolumeGroupFromAudioAttributes(const AudioAttributes &aa,
volume_group_t &volumeGroup) = 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 status_t openOutput(audio_module_handle_t module,
audio_io_handle_t *output,
audio_config_t *config,
audio_devices_t *devices,
const String8& address,
uint32_t *latencyMs,
audio_output_flags_t flags) = 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 status_t openInput(audio_module_handle_t module,
audio_io_handle_t *input,
audio_config_t *config,
audio_devices_t *device,
const String8& address,
audio_source_t source,
audio_input_flags_t flags) = 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(audio_stream_type_t 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(audio_stream_type_t 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;
// 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;
virtual void setEffectSuspended(int effectId,
audio_session_t sessionId,
bool suspended) = 0;
/* Create a patch between several source and sink ports */
virtual status_t createAudioPatch(const struct audio_patch *patch,
audio_patch_handle_t *handle,
int delayMs) = 0;
/* Release a patch */
virtual status_t releaseAudioPatch(audio_patch_handle_t handle,
int delayMs) = 0;
/* Set audio port configuration */
virtual status_t setAudioPortConfig(const struct audio_port_config *config, int delayMs) = 0;
virtual void onAudioPortListUpdate() = 0;
virtual void onAudioPatchListUpdate() = 0;
virtual void onAudioVolumeGroupChanged(volume_group_t group, int flags) = 0;
virtual audio_unique_id_t newAudioUniqueId(audio_unique_id_use_t use) = 0;
virtual void onDynamicPolicyMixStateUpdate(String8 regId, int32_t state) = 0;
virtual void onRecordingConfigurationUpdate(int event,
const record_client_info_t *clientInfo,
const audio_config_base_t *clientConfig,
std::vector<effect_descriptor_t> clientEffects,
const audio_config_base_t *deviceConfig,
std::vector<effect_descriptor_t> effects,
audio_patch_handle_t patchHandle,
audio_source_t source) = 0;
extern "C" AudioPolicyInterface* createAudioPolicyManager(AudioPolicyClientInterface *clientInterface);
extern "C" void destroyAudioPolicyManager(AudioPolicyInterface *interface);
} // namespace android