| /* |
| * 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. |
| */ |
| |
| #ifndef ANDROID_AUDIOPOLICYINTERFACE_H |
| #define ANDROID_AUDIOPOLICYINTERFACE_H |
| |
| #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 libaudio.so) |
| // and is linked with libaudioflinger.so |
| |
| |
| // Audio Policy Manager Interface |
| class AudioPolicyInterface |
| { |
| |
| public: |
| 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, |
| int session = 0) = 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, |
| int session = 0) = 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, |
| int 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 |
| { |
| public: |
| 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(int 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 |
| |
| #endif // ANDROID_AUDIOPOLICYINTERFACE_H |
