2 * Copyright (C) 2009 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include <sys/types.h>
20 #include <cutils/config_utils.h>
21 #include <cutils/misc.h>
22 #include <utils/Timers.h>
23 #include <utils/Errors.h>
24 #include <utils/KeyedVector.h>
25 #include <utils/SortedVector.h>
26 #include <hardware_legacy/AudioPolicyInterface.h>
29 namespace android_audio_legacy {
30 using android::KeyedVector;
31 using android::DefaultKeyedVector;
32 using android::SortedVector;
34 // ----------------------------------------------------------------------------
36 #define MAX_DEVICE_ADDRESS_LEN 20
37 // Attenuation applied to STRATEGY_SONIFICATION streams when a headset is connected: 6dB
38 #define SONIFICATION_HEADSET_VOLUME_FACTOR 0.5
39 // Min volume for STRATEGY_SONIFICATION streams when limited by music volume: -36dB
40 #define SONIFICATION_HEADSET_VOLUME_MIN 0.016
41 // Time in milliseconds during which we consider that music is still active after a music
42 // track was stopped - see computeVolume()
43 #define SONIFICATION_HEADSET_MUSIC_DELAY 5000
44 // Time in milliseconds after media stopped playing during which we consider that the
45 // sonification should be as unobtrusive as during the time media was playing.
46 #define SONIFICATION_RESPECTFUL_AFTER_MUSIC_DELAY 5000
47 // Time in milliseconds during witch some streams are muted while the audio path
49 #define MUTE_TIME_MS 2000
51 #define NUM_TEST_OUTPUTS 5
53 #define NUM_VOL_CURVE_KNEES 2
55 // ----------------------------------------------------------------------------
56 // AudioPolicyManagerBase implements audio policy manager behavior common to all platforms.
57 // Each platform must implement an AudioPolicyManager class derived from AudioPolicyManagerBase
58 // and override methods for which the platform specific behavior differs from the implementation
59 // in AudioPolicyManagerBase. Even if no specific behavior is required, the AudioPolicyManager
60 // class must be implemented as well as the class factory function createAudioPolicyManager()
61 // and provided in a shared library libaudiopolicy.so.
62 // ----------------------------------------------------------------------------
64 class AudioPolicyManagerBase: public AudioPolicyInterface
65 #ifdef AUDIO_POLICY_TEST
67 #endif //AUDIO_POLICY_TEST
71 AudioPolicyManagerBase(AudioPolicyClientInterface *clientInterface);
72 virtual ~AudioPolicyManagerBase();
74 // AudioPolicyInterface
75 virtual status_t setDeviceConnectionState(AudioSystem::audio_devices device,
76 AudioSystem::device_connection_state state,
77 const char *device_address);
78 virtual AudioSystem::device_connection_state getDeviceConnectionState(AudioSystem::audio_devices device,
79 const char *device_address);
80 virtual void setPhoneState(int state);
81 virtual void setForceUse(AudioSystem::force_use usage, AudioSystem::forced_config config);
82 virtual AudioSystem::forced_config getForceUse(AudioSystem::force_use usage);
83 virtual void setSystemProperty(const char* property, const char* value);
84 virtual status_t initCheck();
85 virtual audio_io_handle_t getOutput(AudioSystem::stream_type stream,
86 uint32_t samplingRate = 0,
87 uint32_t format = AudioSystem::FORMAT_DEFAULT,
88 uint32_t channels = 0,
89 AudioSystem::output_flags flags =
90 AudioSystem::OUTPUT_FLAG_INDIRECT);
91 virtual status_t startOutput(audio_io_handle_t output,
92 AudioSystem::stream_type stream,
94 virtual status_t stopOutput(audio_io_handle_t output,
95 AudioSystem::stream_type stream,
97 virtual void releaseOutput(audio_io_handle_t output);
98 virtual audio_io_handle_t getInput(int inputSource,
99 uint32_t samplingRate,
102 AudioSystem::audio_in_acoustics acoustics);
104 // indicates to the audio policy manager that the input starts being used.
105 virtual status_t startInput(audio_io_handle_t input);
107 // indicates to the audio policy manager that the input stops being used.
108 virtual status_t stopInput(audio_io_handle_t input);
109 virtual void releaseInput(audio_io_handle_t input);
110 virtual void initStreamVolume(AudioSystem::stream_type stream,
113 virtual status_t setStreamVolumeIndex(AudioSystem::stream_type stream,
115 audio_devices_t device);
116 virtual status_t getStreamVolumeIndex(AudioSystem::stream_type stream,
118 audio_devices_t device);
120 // return the strategy corresponding to a given stream type
121 virtual uint32_t getStrategyForStream(AudioSystem::stream_type stream);
123 // return the enabled output devices for the given stream type
124 virtual audio_devices_t getDevicesForStream(AudioSystem::stream_type stream);
126 virtual audio_io_handle_t getOutputForEffect(effect_descriptor_t *desc);
127 virtual status_t registerEffect(effect_descriptor_t *desc,
128 audio_io_handle_t io,
132 virtual status_t unregisterEffect(int id);
133 virtual status_t setEffectEnabled(int id, bool enabled);
135 virtual bool isStreamActive(int stream, uint32_t inPastMs = 0) const;
137 virtual status_t dump(int fd);
141 enum routing_strategy {
144 STRATEGY_SONIFICATION,
145 STRATEGY_SONIFICATION_RESPECTFUL,
147 STRATEGY_ENFORCED_AUDIBLE,
151 // 4 points to define the volume attenuation curve, each characterized by the volume
152 // index (from 0 to 100) at which they apply, and the attenuation in dB at that index.
153 // we use 100 steps to avoid rounding errors when computing the volume in volIndexToAmpl()
155 enum { VOLMIN = 0, VOLKNEE1 = 1, VOLKNEE2 = 2, VOLMAX = 3, VOLCNT = 4};
157 class VolumeCurvePoint
161 float mDBAttenuation;
164 // device categories used for volume curve management.
165 enum device_category {
166 DEVICE_CATEGORY_HEADSET,
167 DEVICE_CATEGORY_SPEAKER,
168 DEVICE_CATEGORY_EARPIECE,
172 // the IOProfile class describes the capabilities of an output or input stream.
173 // It is currently assumed that all combination of listed parameters are supported.
174 // It is used by the policy manager to determine if an output or input is suitable for
175 // a given use case, open/close it accordingly and connect/disconnect audio tracks
180 IOProfile(const char *module);
185 Vector <uint32_t> mSamplingRates; // supported sampling rates
186 Vector <audio_channel_mask_t> mChannelMasks; // supported channel masks
187 Vector <audio_format_t> mFormats; // supported audio formats
188 audio_devices_t mSupportedDevices; // supported devices (devices this output can be
190 audio_policy_output_flags_t mFlags; // attribute flags (e.g primary output,
191 // direct output...). For outputs only.
192 char *mModuleName; // base name of the audio HW module exposing this I/O stream
193 // (primary, a2dp ...)
196 // default volume curve
197 static const VolumeCurvePoint sDefaultVolumeCurve[AudioPolicyManagerBase::VOLCNT];
198 // default volume curve for media strategy
199 static const VolumeCurvePoint sDefaultMediaVolumeCurve[AudioPolicyManagerBase::VOLCNT];
200 // volume curve for media strategy on speakers
201 static const VolumeCurvePoint sSpeakerMediaVolumeCurve[AudioPolicyManagerBase::VOLCNT];
202 // volume curve for sonification strategy on speakers
203 static const VolumeCurvePoint sSpeakerSonificationVolumeCurve[AudioPolicyManagerBase::VOLCNT];
204 // default volume curves per strategy and device category. See initializeVolumeCurves()
205 static const VolumeCurvePoint *sVolumeProfiles[NUM_STRATEGIES][DEVICE_CATEGORY_CNT];
207 // descriptor for audio outputs. Used to maintain current configuration of each opened audio output
208 // and keep track of the usage of this output by each audio stream type.
209 class AudioOutputDescriptor
212 AudioOutputDescriptor(const IOProfile *profile);
214 status_t dump(int fd);
216 audio_devices_t device();
217 void changeRefCount(AudioSystem::stream_type, int delta);
219 uint32_t strategyRefCount(routing_strategy strategy);
220 bool isUsedByStrategy(routing_strategy strategy) { return (strategyRefCount(strategy) != 0);}
221 bool isDuplicated() const { return (mOutput1 != NULL && mOutput2 != NULL); }
222 audio_devices_t supportedDevices();
224 bool sharesHwModuleWith(const AudioOutputDescriptor *outputDesc);
226 audio_io_handle_t mId; // output handle
227 uint32_t mSamplingRate; //
229 uint32_t mChannels; // output configuration
230 uint32_t mLatency; //
231 AudioSystem::output_flags mFlags; //
232 audio_devices_t mDevice; // current device this output is routed to
233 uint32_t mRefCount[AudioSystem::NUM_STREAM_TYPES]; // number of streams of each type using this output
234 nsecs_t mStopTime[AudioSystem::NUM_STREAM_TYPES];
235 AudioOutputDescriptor *mOutput1; // used by duplicated outputs: first output
236 AudioOutputDescriptor *mOutput2; // used by duplicated outputs: second output
237 float mCurVolume[AudioSystem::NUM_STREAM_TYPES]; // current stream volume
238 int mMuteCount[AudioSystem::NUM_STREAM_TYPES]; // mute request counter
239 const IOProfile *mProfile; // I/O profile this output derives from
240 bool mStrategyMutedByDevice[NUM_STRATEGIES]; // strategies muted because of incompatible
241 // device selection. See checkDeviceMuteStrategies()
244 // descriptor for audio inputs. Used to maintain current configuration of each opened audio input
245 // and keep track of the usage of this input.
246 class AudioInputDescriptor
249 AudioInputDescriptor(const IOProfile *profile);
251 status_t dump(int fd);
253 uint32_t mSamplingRate; //
254 uint32_t mFormat; // input configuration
255 uint32_t mChannels; //
256 AudioSystem::audio_in_acoustics mAcoustics; //
257 audio_devices_t mDevice; // current device this input is routed to
258 uint32_t mRefCount; // number of AudioRecord clients using this output
259 int mInputSource; // input source selected by application (mediarecorder.h)
260 const IOProfile *mProfile; // I/O profile this output derives from
263 // stream descriptor used for volume control
264 class StreamDescriptor
269 int getVolumeIndex(audio_devices_t device);
272 int mIndexMin; // min volume index
273 int mIndexMax; // max volume index
274 KeyedVector<audio_devices_t, int> mIndexCur; // current volume index per device
275 bool mCanBeMuted; // true is the stream can be muted
277 const VolumeCurvePoint *mVolumeCurve[DEVICE_CATEGORY_CNT];
280 // stream descriptor used for volume control
281 class EffectDescriptor
285 status_t dump(int fd);
287 int mIo; // io the effect is attached to
288 routing_strategy mStrategy; // routing strategy the effect is associated to
289 int mSession; // audio session the effect is on
290 effect_descriptor_t mDesc; // effect descriptor
291 bool mEnabled; // enabled state: CPU load being used or not
294 void addOutput(audio_io_handle_t id, AudioOutputDescriptor *outputDesc);
296 // return the strategy corresponding to a given stream type
297 static routing_strategy getStrategy(AudioSystem::stream_type stream);
299 // return appropriate device for streams handled by the specified strategy according to current
300 // phone state, connected devices...
301 // if fromCache is true, the device is returned from mDeviceForStrategy[],
302 // otherwise it is determine by current state
303 // (device connected,phone state, force use, a2dp output...)
305 // 1 speed up process when the state is stable (when starting or stopping an output)
306 // 2 access to either current device selection (fromCache == true) or
307 // "future" device selection (fromCache == false) when called from a context
308 // where conditions are changing (setDeviceConnectionState(), setPhoneState()...) AND
309 // before updateDeviceForStrategy() is called.
310 virtual audio_devices_t getDeviceForStrategy(routing_strategy strategy,
313 // change the route of the specified output
314 void setOutputDevice(audio_io_handle_t output,
315 audio_devices_t device,
319 // select input device corresponding to requested audio source
320 virtual audio_devices_t getDeviceForInputSource(int inputSource);
322 // return io handle of active input or 0 if no input is active
323 audio_io_handle_t getActiveInput();
325 // initialize volume curves for each strategy and device category
326 void initializeVolumeCurves();
328 // compute the actual volume for a given stream according to the requested index and a particular
330 virtual float computeVolume(int stream, int index, audio_io_handle_t output, audio_devices_t device);
332 // check that volume change is permitted, compute and send new volume to audio hardware
333 status_t checkAndSetVolume(int stream, int index, audio_io_handle_t output, audio_devices_t device, int delayMs = 0, bool force = false);
335 // apply all stream volumes to the specified output and device
336 void applyStreamVolumes(audio_io_handle_t output, audio_devices_t device, int delayMs = 0, bool force = false);
338 // Mute or unmute all streams handled by the specified strategy on the specified output
339 void setStrategyMute(routing_strategy strategy, bool on, audio_io_handle_t output, int delayMs = 0);
341 // Mute or unmute the stream on the specified output
342 void setStreamMute(int stream, bool on, audio_io_handle_t output, int delayMs = 0);
344 // handle special cases for sonification strategy while in call: mute streams or replace by
345 // a special tone in the device used for communication
346 void handleIncallSonification(int stream, bool starting, bool stateChange);
348 // true if device is in a telephony or VoIP call
349 virtual bool isInCall();
351 // true if given state represents a device in a telephony or VoIP call
352 virtual bool isStateInCall(int state);
354 // when a device is connected, checks if an open output can be routed
355 // to this device. If none is open, tries to open one of the available outputs.
356 // Returns an output suitable to this device or 0.
357 // when a device is disconnected, checks if an output is not used any more and
358 // returns its handle if any.
359 // transfers the audio tracks and effects from one output thread to another accordingly.
360 audio_io_handle_t checkOutputForDevice(audio_devices_t device,
361 AudioSystem::device_connection_state state);
363 // close an output and its companion duplicating output.
364 void closeOutput(audio_io_handle_t output);
366 // checks and if necessary changes outputs used for all strategies.
367 // must be called every time a condition that affects the output choice for a given strategy
368 // changes: connected device, phone state, force use...
369 // Must be called before updateDeviceForStrategy()
370 void checkOutputForStrategy(routing_strategy strategy);
372 // Same as checkOutputForStrategy() but for a all strategies in order of priority
373 void checkOutputForAllStrategies();
375 // manages A2DP output suspend/restore according to phone state and BT SCO usage
376 void checkA2dpSuspend();
378 // returns the A2DP output handle if it is open or 0 otherwise
379 audio_io_handle_t getA2dpOutput();
381 // selects the most appropriate device on output for current state
382 // must be called every time a condition that affects the device choice for a given output is
383 // changed: connected device, phone state, force use, output start, output stop..
384 // see getDeviceForStrategy() for the use of fromCache parameter
386 audio_devices_t getNewDevice(audio_io_handle_t output, bool fromCache);
387 // updates cache of device used by all strategies (mDeviceForStrategy[])
388 // must be called every time a condition that affects the device choice for a given strategy is
389 // changed: connected device, phone state, force use...
390 // cached values are used by getDeviceForStrategy() if parameter fromCache is true.
391 // Must be called after checkOutputForAllStrategies()
393 void updateDeviceForStrategy();
395 // true if current platform requires a specific output to be opened for this particular
396 // set of parameters. This function is called by getOutput() and is implemented by platform
397 // specific audio policy manager.
398 virtual bool needsDirectOuput(AudioSystem::stream_type stream,
399 uint32_t samplingRate,
402 AudioSystem::output_flags flags,
405 virtual uint32_t getMaxEffectsCpuLoad();
406 virtual uint32_t getMaxEffectsMemory();
407 #ifdef AUDIO_POLICY_TEST
408 virtual bool threadLoop();
410 int testOutputIndex(audio_io_handle_t output);
411 #endif //AUDIO_POLICY_TEST
413 status_t setEffectEnabled(EffectDescriptor *pDesc, bool enabled);
415 // returns the category the device belongs to with regard to volume curve management
416 static device_category getDeviceCategory(audio_devices_t device);
418 // extract one device relevant for volume control from multiple device selection
419 static audio_devices_t getDeviceForVolume(audio_devices_t device);
421 SortedVector<audio_io_handle_t> getOutputsForDevice(audio_devices_t device);
422 bool vectorsEqual(SortedVector<audio_io_handle_t>& outputs1,
423 SortedVector<audio_io_handle_t>& outputs2);
425 void checkDeviceMuteStrategies(AudioOutputDescriptor *outputDesc,
428 audio_io_handle_t selectOutput(const SortedVector<audio_io_handle_t>& outputs,
429 AudioSystem::output_flags flags);
430 IOProfile *getInputProfile(audio_devices_t device,
431 uint32_t samplingRate,
433 uint32_t channelMask);
436 // Audio policy configuration file parsing (audio_policy.conf)
438 static uint32_t stringToEnum(const struct StringToEnum *table,
441 static audio_policy_output_flags_t parseFlagNames(char *name);
442 static audio_devices_t parseDeviceNames(char *name);
443 void loadSamplingRates(char *name, IOProfile *profile);
444 void loadFormats(char *name, IOProfile *profile);
445 void loadOutChannels(char *name, IOProfile *profile);
446 void loadInChannels(char *name, IOProfile *profile);
447 status_t loadOutput(cnode *root, const char *module);
448 status_t loadInput(cnode *root, const char *module);
449 void loadHwModule(cnode *root);
450 void loadHwModules(cnode *root);
451 void loadGlobalConfig(cnode *root);
452 status_t loadAudioPolicyConfig(const char *path);
455 AudioPolicyClientInterface *mpClientInterface; // audio policy client interface
456 audio_io_handle_t mPrimaryOutput; // primary output handle
457 DefaultKeyedVector<audio_io_handle_t, AudioOutputDescriptor *> mOutputs; // list of output descriptors
458 DefaultKeyedVector<audio_io_handle_t, AudioInputDescriptor *> mInputs; // list of input descriptors
459 audio_devices_t mAvailableOutputDevices; // bit field of all available output devices
460 audio_devices_t mAvailableInputDevices; // bit field of all available input devices
461 int mPhoneState; // current phone state
462 AudioSystem::forced_config mForceUse[AudioSystem::NUM_FORCE_USE]; // current forced use configuration
464 StreamDescriptor mStreams[AudioSystem::NUM_STREAM_TYPES]; // stream descriptors for volume control
465 String8 mA2dpDeviceAddress; // A2DP device MAC address
466 String8 mScoDeviceAddress; // SCO device MAC address
467 bool mLimitRingtoneVolume; // limit ringtone volume to music volume if headset connected
468 audio_devices_t mDeviceForStrategy[NUM_STRATEGIES];
469 float mLastVoiceVolume; // last voice volume value sent to audio HAL
471 // Maximum CPU load allocated to audio effects in 0.1 MIPS (ARMv5TE, 0 WS memory) units
472 static const uint32_t MAX_EFFECTS_CPU_LOAD = 1000;
473 // Maximum memory allocated to audio effects in KB
474 static const uint32_t MAX_EFFECTS_MEMORY = 512;
475 uint32_t mTotalEffectsCpuLoad; // current CPU load used by effects
476 uint32_t mTotalEffectsMemory; // current memory used by effects
477 KeyedVector<int, EffectDescriptor *> mEffects; // list of registered audio effects
478 bool mA2dpSuspended; // true if A2DP output is suspended
479 bool mHasA2dp; // true on platforms with support for bluetooth A2DP
480 audio_devices_t mAttachedOutputDevices; // output devices always available on the platform
481 audio_devices_t mDefaultOutputDevice; // output device selected by default at boot time
482 // (must be in mAttachedOutputDevices)
484 Vector <IOProfile *> mOutputProfiles; // output profiles loaded from audio_policy.conf
485 Vector <IOProfile *> mInputProfiles; // input profiles loaded from audio_policy.conf
487 #ifdef AUDIO_POLICY_TEST
489 Condition mWaitWorkCV;
493 audio_io_handle_t mTestOutputs[NUM_TEST_OUTPUTS];
495 uint32_t mTestDevice;
496 uint32_t mTestSamplingRate;
497 uint32_t mTestFormat;
498 uint32_t mTestChannels;
499 uint32_t mTestLatencyMs;
500 #endif //AUDIO_POLICY_TEST
503 static float volIndexToAmpl(audio_devices_t device, const StreamDescriptor& streamDesc,
505 // updates device caching and output for streams that can influence the
506 // routing of notifications
507 void handleNotificationRoutingForStream(AudioSystem::stream_type stream);