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262 lines
13 KiB
262 lines
13 KiB
4 months ago
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/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_AUDIOPOLICYINTERFACE_H
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#define ANDROID_AUDIOPOLICYINTERFACE_H
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#include <media/AudioSystem.h>
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#include <media/ToneGenerator.h>
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#include <utils/String8.h>
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#include <hardware_legacy/AudioSystemLegacy.h>
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#include <hardware/audio_policy.h>
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namespace android_audio_legacy {
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using android::Vector;
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using android::String8;
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using android::ToneGenerator;
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// ----------------------------------------------------------------------------
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// The AudioPolicyInterface and AudioPolicyClientInterface classes define the communication interfaces
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// between the platform specific audio policy manager and Android generic audio policy manager.
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// The platform specific audio policy manager must implement methods of the AudioPolicyInterface class.
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// This implementation makes use of the AudioPolicyClientInterface to control the activity and
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// configuration of audio input and output streams.
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//
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// The platform specific audio policy manager is in charge of the audio routing and volume control
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// policies for a given platform.
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// The main roles of this module are:
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// - keep track of current system state (removable device connections, phone state, user requests...).
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// System state changes and user actions are notified to audio policy manager with methods of the AudioPolicyInterface.
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// - process getOutput() queries received when AudioTrack objects are created: Those queries
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// return a handler on an output that has been selected, configured and opened by the audio policy manager and that
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// must be used by the AudioTrack when registering to the AudioFlinger with the createTrack() method.
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// When the AudioTrack object is released, a putOutput() query is received and the audio policy manager can decide
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// to close or reconfigure the output depending on other streams using this output and current system state.
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// - similarly process getInput() and putInput() queries received from AudioRecord objects and configure audio inputs.
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// - process volume control requests: the stream volume is converted from an index value (received from UI) to a float value
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// applicable to each output as a function of platform specific settings and current output route (destination device). It
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// also make sure that streams are not muted if not allowed (e.g. camera shutter sound in some countries).
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//
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// The platform specific audio policy manager is provided as a shared library by platform vendors (as for libaudio.so)
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// and is linked with libaudioflinger.so
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// Audio Policy Manager Interface
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class AudioPolicyInterface
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{
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public:
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virtual ~AudioPolicyInterface() {}
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//
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// configuration functions
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//
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// indicate a change in device connection status
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virtual status_t setDeviceConnectionState(audio_devices_t device,
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AudioSystem::device_connection_state state,
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const char *device_address) = 0;
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// retrieve a device connection status
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virtual AudioSystem::device_connection_state getDeviceConnectionState(audio_devices_t device,
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const char *device_address) = 0;
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// indicate a change in phone state. Valid phones states are defined by AudioSystem::audio_mode
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virtual void setPhoneState(int state) = 0;
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// force using a specific device category for the specified usage
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virtual void setForceUse(AudioSystem::force_use usage, AudioSystem::forced_config config) = 0;
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// retrieve current device category forced for a given usage
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virtual AudioSystem::forced_config getForceUse(AudioSystem::force_use usage) = 0;
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// set a system property (e.g. camera sound always audible)
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virtual void setSystemProperty(const char* property, const char* value) = 0;
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// check proper initialization
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virtual status_t initCheck() = 0;
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//
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// Audio routing query functions
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//
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// request an output appropriate for playback of the supplied stream type and parameters
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virtual audio_io_handle_t getOutput(AudioSystem::stream_type stream,
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uint32_t samplingRate,
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audio_format_t format,
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audio_channel_mask_t channelMask,
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AudioSystem::output_flags flags,
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const audio_offload_info_t *offloadInfo) = 0;
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// indicates to the audio policy manager that the output starts being used by corresponding stream.
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virtual status_t startOutput(audio_io_handle_t output,
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AudioSystem::stream_type stream,
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audio_session_t session = AUDIO_SESSION_NONE) = 0;
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// indicates to the audio policy manager that the output stops being used by corresponding stream.
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virtual status_t stopOutput(audio_io_handle_t output,
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AudioSystem::stream_type stream,
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audio_session_t session = AUDIO_SESSION_NONE) = 0;
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// releases the output.
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virtual void releaseOutput(audio_io_handle_t output) = 0;
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// request an input appropriate for record from the supplied device with supplied parameters.
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virtual audio_io_handle_t getInput(int inputSource,
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uint32_t samplingRate,
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audio_format_t format,
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audio_channel_mask_t channelMask,
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AudioSystem::audio_in_acoustics acoustics) = 0;
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// indicates to the audio policy manager that the input starts being used.
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virtual status_t startInput(audio_io_handle_t input) = 0;
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// indicates to the audio policy manager that the input stops being used.
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virtual status_t stopInput(audio_io_handle_t input) = 0;
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// releases the input.
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virtual void releaseInput(audio_io_handle_t input) = 0;
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//
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// volume control functions
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//
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// initialises stream volume conversion parameters by specifying volume index range.
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virtual void initStreamVolume(AudioSystem::stream_type stream,
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int indexMin,
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int indexMax) = 0;
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// sets the new stream volume at a level corresponding to the supplied index for the
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// supplied device. By convention, specifying AUDIO_DEVICE_OUT_DEFAULT means
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// setting volume for all devices
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virtual status_t setStreamVolumeIndex(AudioSystem::stream_type stream,
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int index,
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audio_devices_t device) = 0;
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// retrieve current volume index for the specified stream and the
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// specified device. By convention, specifying AUDIO_DEVICE_OUT_DEFAULT means
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// querying the volume of the active device.
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virtual status_t getStreamVolumeIndex(AudioSystem::stream_type stream,
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int *index,
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audio_devices_t device) = 0;
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// return the strategy corresponding to a given stream type
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virtual uint32_t getStrategyForStream(AudioSystem::stream_type stream) = 0;
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// return the enabled output devices for the given stream type
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virtual audio_devices_t getDevicesForStream(AudioSystem::stream_type stream) = 0;
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// Audio effect management
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virtual audio_io_handle_t getOutputForEffect(const effect_descriptor_t *desc) = 0;
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virtual status_t registerEffect(const effect_descriptor_t *desc,
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audio_io_handle_t io,
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uint32_t strategy,
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audio_session_t session,
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int id) = 0;
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virtual status_t unregisterEffect(int id) = 0;
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virtual status_t setEffectEnabled(int id, bool enabled) = 0;
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virtual bool isStreamActive(int stream, uint32_t inPastMs = 0) const = 0;
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virtual bool isStreamActiveRemotely(int stream, uint32_t inPastMs = 0) const = 0;
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virtual bool isSourceActive(audio_source_t source) const = 0;
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//dump state
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virtual status_t dump(int fd) = 0;
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virtual bool isOffloadSupported(const audio_offload_info_t& offloadInfo) = 0;
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};
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// Audio Policy client Interface
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class AudioPolicyClientInterface
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{
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public:
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virtual ~AudioPolicyClientInterface() {}
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//
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// Audio HW module functions
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//
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// loads a HW module.
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virtual audio_module_handle_t loadHwModule(const char *name) = 0;
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//
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// Audio output Control functions
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//
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// opens an audio output with the requested parameters. The parameter values can indicate to use the default values
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// in case the audio policy manager has no specific requirements for the output being opened.
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// When the function returns, the parameter values reflect the actual values used by the audio hardware output stream.
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// The audio policy manager can check if the proposed parameters are suitable or not and act accordingly.
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virtual audio_io_handle_t openOutput(audio_module_handle_t module,
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audio_devices_t *pDevices,
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uint32_t *pSamplingRate,
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audio_format_t *pFormat,
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audio_channel_mask_t *pChannelMask,
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uint32_t *pLatencyMs,
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audio_output_flags_t flags,
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const audio_offload_info_t *offloadInfo = NULL) = 0;
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// creates a special output that is duplicated to the two outputs passed as arguments. The duplication is performed by
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// a special mixer thread in the AudioFlinger.
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virtual audio_io_handle_t openDuplicateOutput(audio_io_handle_t output1, audio_io_handle_t output2) = 0;
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// closes the output stream
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virtual status_t closeOutput(audio_io_handle_t output) = 0;
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// suspends the output. When an output is suspended, the corresponding audio hardware output stream is placed in
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// standby and the AudioTracks attached to the mixer thread are still processed but the output mix is discarded.
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virtual status_t suspendOutput(audio_io_handle_t output) = 0;
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// restores a suspended output.
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virtual status_t restoreOutput(audio_io_handle_t output) = 0;
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//
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// Audio input Control functions
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//
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// opens an audio input
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virtual audio_io_handle_t openInput(audio_module_handle_t module,
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audio_devices_t *pDevices,
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uint32_t *pSamplingRate,
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audio_format_t *pFormat,
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audio_channel_mask_t *pChannelMask) = 0;
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// closes an audio input
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virtual status_t closeInput(audio_io_handle_t input) = 0;
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//
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// misc control functions
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//
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// set a stream volume for a particular output. For the same user setting, a given stream type can have different volumes
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// for each output (destination device) it is attached to.
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virtual status_t setStreamVolume(AudioSystem::stream_type stream, float volume, audio_io_handle_t output, int delayMs = 0) = 0;
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// invalidate a stream type, causing a reroute to an unspecified new output
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virtual status_t invalidateStream(AudioSystem::stream_type stream) = 0;
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// function enabling to send proprietary informations directly from audio policy manager to audio hardware interface.
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virtual void setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs, int delayMs = 0) = 0;
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// function enabling to receive proprietary informations directly from audio hardware interface to audio policy manager.
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virtual String8 getParameters(audio_io_handle_t ioHandle, const String8& keys) = 0;
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// request the playback of a tone on the specified stream: used for instance to replace notification sounds when playing
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// over a telephony device during a phone call.
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virtual status_t startTone(ToneGenerator::tone_type tone, AudioSystem::stream_type stream) = 0;
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virtual status_t stopTone() = 0;
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// set down link audio volume.
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virtual status_t setVoiceVolume(float volume, int delayMs = 0) = 0;
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// move effect to the specified output
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virtual status_t moveEffects(audio_session_t session,
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audio_io_handle_t srcOutput,
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audio_io_handle_t dstOutput) = 0;
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};
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extern "C" AudioPolicyInterface* createAudioPolicyManager(AudioPolicyClientInterface *clientInterface);
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extern "C" void destroyAudioPolicyManager(AudioPolicyInterface *interface);
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}; // namespace android
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#endif // ANDROID_AUDIOPOLICYINTERFACE_H
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