AudioSystem.h revision 203b1a18a806e2c56c701aac49cda963bccfad5b
1/* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 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 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 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. 15 */ 16 17#ifndef ANDROID_AUDIOSYSTEM_H_ 18#define ANDROID_AUDIOSYSTEM_H_ 19 20#include <hardware/audio_effect.h> 21#include <media/IAudioFlingerClient.h> 22#include <system/audio.h> 23#include <system/audio_policy.h> 24#include <utils/Errors.h> 25#include <utils/Mutex.h> 26 27namespace android { 28 29typedef void (*audio_error_callback)(status_t err); 30 31class IAudioFlinger; 32class IAudioPolicyService; 33class String8; 34 35class AudioSystem 36{ 37public: 38 39 /* These are static methods to control the system-wide AudioFlinger 40 * only privileged processes can have access to them 41 */ 42 43 // mute/unmute microphone 44 static status_t muteMicrophone(bool state); 45 static status_t isMicrophoneMuted(bool *state); 46 47 // set/get master volume 48 static status_t setMasterVolume(float value); 49 static status_t getMasterVolume(float* volume); 50 51 // mute/unmute audio outputs 52 static status_t setMasterMute(bool mute); 53 static status_t getMasterMute(bool* mute); 54 55 // set/get stream volume on specified output 56 static status_t setStreamVolume(audio_stream_type_t stream, float value, 57 audio_io_handle_t output); 58 static status_t getStreamVolume(audio_stream_type_t stream, float* volume, 59 audio_io_handle_t output); 60 61 // mute/unmute stream 62 static status_t setStreamMute(audio_stream_type_t stream, bool mute); 63 static status_t getStreamMute(audio_stream_type_t stream, bool* mute); 64 65 // set audio mode in audio hardware 66 static status_t setMode(audio_mode_t mode); 67 68 // returns true in *state if tracks are active on the specified stream or have been active 69 // in the past inPastMs milliseconds 70 static status_t isStreamActive(audio_stream_type_t stream, bool *state, uint32_t inPastMs); 71 // returns true in *state if tracks are active for what qualifies as remote playback 72 // on the specified stream or have been active in the past inPastMs milliseconds. Remote 73 // playback isn't mutually exclusive with local playback. 74 static status_t isStreamActiveRemotely(audio_stream_type_t stream, bool *state, 75 uint32_t inPastMs); 76 // returns true in *state if a recorder is currently recording with the specified source 77 static status_t isSourceActive(audio_source_t source, bool *state); 78 79 // set/get audio hardware parameters. The function accepts a list of parameters 80 // key value pairs in the form: key1=value1;key2=value2;... 81 // Some keys are reserved for standard parameters (See AudioParameter class). 82 // The versions with audio_io_handle_t are intended for internal media framework use only. 83 static status_t setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs); 84 static String8 getParameters(audio_io_handle_t ioHandle, const String8& keys); 85 // The versions without audio_io_handle_t are intended for JNI. 86 static status_t setParameters(const String8& keyValuePairs); 87 static String8 getParameters(const String8& keys); 88 89 static void setErrorCallback(audio_error_callback cb); 90 91 // helper function to obtain AudioFlinger service handle 92 static const sp<IAudioFlinger>& get_audio_flinger(); 93 94 static float linearToLog(int volume); 95 static int logToLinear(float volume); 96 97 // Returned samplingRate and frameCount output values are guaranteed 98 // to be non-zero if status == NO_ERROR 99 static status_t getOutputSamplingRate(uint32_t* samplingRate, 100 audio_stream_type_t stream); 101 static status_t getOutputFrameCount(size_t* frameCount, 102 audio_stream_type_t stream); 103 static status_t getOutputLatency(uint32_t* latency, 104 audio_stream_type_t stream); 105 static status_t getSamplingRate(audio_io_handle_t output, 106 audio_stream_type_t streamType, 107 uint32_t* samplingRate); 108 // returns the number of frames per audio HAL write buffer. Corresponds to 109 // audio_stream->get_buffer_size()/audio_stream_frame_size() 110 static status_t getFrameCount(audio_io_handle_t output, 111 audio_stream_type_t stream, 112 size_t* frameCount); 113 // returns the audio output stream latency in ms. Corresponds to 114 // audio_stream_out->get_latency() 115 static status_t getLatency(audio_io_handle_t output, 116 uint32_t* latency); 117 118 static bool routedToA2dpOutput(audio_stream_type_t streamType); 119 120 // return status NO_ERROR implies *buffSize > 0 121 static status_t getInputBufferSize(uint32_t sampleRate, audio_format_t format, 122 audio_channel_mask_t channelMask, size_t* buffSize); 123 124 static status_t setVoiceVolume(float volume); 125 126 // return the number of audio frames written by AudioFlinger to audio HAL and 127 // audio dsp to DAC since the specified output I/O handle has exited standby. 128 // returned status (from utils/Errors.h) can be: 129 // - NO_ERROR: successful operation, halFrames and dspFrames point to valid data 130 // - INVALID_OPERATION: Not supported on current hardware platform 131 // - BAD_VALUE: invalid parameter 132 // NOTE: this feature is not supported on all hardware platforms and it is 133 // necessary to check returned status before using the returned values. 134 static status_t getRenderPosition(audio_io_handle_t output, 135 uint32_t *halFrames, 136 uint32_t *dspFrames); 137 138 // return the number of input frames lost by HAL implementation, or 0 if the handle is invalid 139 static uint32_t getInputFramesLost(audio_io_handle_t ioHandle); 140 141 // Allocate a new audio session ID and return that new ID. 142 // If unable to contact AudioFlinger, returns AUDIO_SESSION_ALLOCATE instead. 143 // FIXME If AudioFlinger were to ever exhaust the session ID namespace, 144 // this method could fail by returning either AUDIO_SESSION_ALLOCATE 145 // or an unspecified existing session ID. 146 static int newAudioSessionId(); 147 148 static void acquireAudioSessionId(int audioSession, pid_t pid); 149 static void releaseAudioSessionId(int audioSession, pid_t pid); 150 151 // types of io configuration change events received with ioConfigChanged() 152 enum io_config_event { 153 OUTPUT_OPENED, 154 OUTPUT_CLOSED, 155 OUTPUT_CONFIG_CHANGED, 156 INPUT_OPENED, 157 INPUT_CLOSED, 158 INPUT_CONFIG_CHANGED, 159 STREAM_CONFIG_CHANGED, 160 NUM_CONFIG_EVENTS 161 }; 162 163 // audio output descriptor used to cache output configurations in client process to avoid 164 // frequent calls through IAudioFlinger 165 class OutputDescriptor { 166 public: 167 OutputDescriptor() 168 : samplingRate(0), format(AUDIO_FORMAT_DEFAULT), channelMask(0), frameCount(0), latency(0) 169 {} 170 171 uint32_t samplingRate; 172 audio_format_t format; 173 audio_channel_mask_t channelMask; 174 size_t frameCount; 175 uint32_t latency; 176 }; 177 178 // Events used to synchronize actions between audio sessions. 179 // For instance SYNC_EVENT_PRESENTATION_COMPLETE can be used to delay recording start until 180 // playback is complete on another audio session. 181 // See definitions in MediaSyncEvent.java 182 enum sync_event_t { 183 SYNC_EVENT_SAME = -1, // used internally to indicate restart with same event 184 SYNC_EVENT_NONE = 0, 185 SYNC_EVENT_PRESENTATION_COMPLETE, 186 187 // 188 // Define new events here: SYNC_EVENT_START, SYNC_EVENT_STOP, SYNC_EVENT_TIME ... 189 // 190 SYNC_EVENT_CNT, 191 }; 192 193 // Timeout for synchronous record start. Prevents from blocking the record thread forever 194 // if the trigger event is not fired. 195 static const uint32_t kSyncRecordStartTimeOutMs = 30000; 196 197 // 198 // IAudioPolicyService interface (see AudioPolicyInterface for method descriptions) 199 // 200 static status_t setDeviceConnectionState(audio_devices_t device, audio_policy_dev_state_t state, 201 const char *device_address); 202 static audio_policy_dev_state_t getDeviceConnectionState(audio_devices_t device, 203 const char *device_address); 204 static status_t setPhoneState(audio_mode_t state); 205 static status_t setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config); 206 static audio_policy_forced_cfg_t getForceUse(audio_policy_force_use_t usage); 207 208 // Client must successfully hand off the handle reference to AudioFlinger via createTrack(), 209 // or release it with releaseOutput(). 210 static audio_io_handle_t getOutput(audio_stream_type_t stream, 211 uint32_t samplingRate = 0, 212 audio_format_t format = AUDIO_FORMAT_DEFAULT, 213 audio_channel_mask_t channelMask = AUDIO_CHANNEL_OUT_STEREO, 214 audio_output_flags_t flags = AUDIO_OUTPUT_FLAG_NONE, 215 const audio_offload_info_t *offloadInfo = NULL); 216 217 static status_t startOutput(audio_io_handle_t output, 218 audio_stream_type_t stream, 219 int session); 220 static status_t stopOutput(audio_io_handle_t output, 221 audio_stream_type_t stream, 222 int session); 223 static void releaseOutput(audio_io_handle_t output); 224 225 // Client must successfully hand off the handle reference to AudioFlinger via openRecord(), 226 // or release it with releaseInput(). 227 static audio_io_handle_t getInput(audio_source_t inputSource, 228 uint32_t samplingRate, 229 audio_format_t format, 230 audio_channel_mask_t channelMask, 231 int sessionId); 232 233 static status_t startInput(audio_io_handle_t input); 234 static status_t stopInput(audio_io_handle_t input); 235 static void releaseInput(audio_io_handle_t input); 236 static status_t initStreamVolume(audio_stream_type_t stream, 237 int indexMin, 238 int indexMax); 239 static status_t setStreamVolumeIndex(audio_stream_type_t stream, 240 int index, 241 audio_devices_t device); 242 static status_t getStreamVolumeIndex(audio_stream_type_t stream, 243 int *index, 244 audio_devices_t device); 245 246 static uint32_t getStrategyForStream(audio_stream_type_t stream); 247 static audio_devices_t getDevicesForStream(audio_stream_type_t stream); 248 249 static audio_io_handle_t getOutputForEffect(const effect_descriptor_t *desc); 250 static status_t registerEffect(const effect_descriptor_t *desc, 251 audio_io_handle_t io, 252 uint32_t strategy, 253 int session, 254 int id); 255 static status_t unregisterEffect(int id); 256 static status_t setEffectEnabled(int id, bool enabled); 257 258 // clear stream to output mapping cache (gStreamOutputMap) 259 // and output configuration cache (gOutputs) 260 static void clearAudioConfigCache(); 261 262 static const sp<IAudioPolicyService>& get_audio_policy_service(); 263 264 // helpers for android.media.AudioManager.getProperty(), see description there for meaning 265 static uint32_t getPrimaryOutputSamplingRate(); 266 static size_t getPrimaryOutputFrameCount(); 267 268 static status_t setLowRamDevice(bool isLowRamDevice); 269 270 // Check if hw offload is possible for given format, stream type, sample rate, 271 // bit rate, duration, video and streaming or offload property is enabled 272 static bool isOffloadSupported(const audio_offload_info_t& info); 273 274 // check presence of audio flinger service. 275 // returns NO_ERROR if binding to service succeeds, DEAD_OBJECT otherwise 276 static status_t checkAudioFlinger(); 277 278 /* List available audio ports and their attributes */ 279 static status_t listAudioPorts(audio_port_role_t role, 280 audio_port_type_t type, 281 unsigned int *num_ports, 282 struct audio_port *ports, 283 unsigned int *generation); 284 285 /* Get attributes for a given audio port */ 286 static status_t getAudioPort(struct audio_port *port); 287 288 /* Create an audio patch between several source and sink ports */ 289 static status_t createAudioPatch(const struct audio_patch *patch, 290 audio_patch_handle_t *handle); 291 292 /* Release an audio patch */ 293 static status_t releaseAudioPatch(audio_patch_handle_t handle); 294 295 /* List existing audio patches */ 296 static status_t listAudioPatches(unsigned int *num_patches, 297 struct audio_patch *patches, 298 unsigned int *generation); 299 /* Set audio port configuration */ 300 static status_t setAudioPortConfig(const struct audio_port_config *config); 301 302 // ---------------------------------------------------------------------------- 303 304private: 305 306 class AudioFlingerClient: public IBinder::DeathRecipient, public BnAudioFlingerClient 307 { 308 public: 309 AudioFlingerClient() { 310 } 311 312 // DeathRecipient 313 virtual void binderDied(const wp<IBinder>& who); 314 315 // IAudioFlingerClient 316 317 // indicate a change in the configuration of an output or input: keeps the cached 318 // values for output/input parameters up-to-date in client process 319 virtual void ioConfigChanged(int event, audio_io_handle_t ioHandle, const void *param2); 320 }; 321 322 class AudioPolicyServiceClient: public IBinder::DeathRecipient 323 { 324 public: 325 AudioPolicyServiceClient() { 326 } 327 328 // DeathRecipient 329 virtual void binderDied(const wp<IBinder>& who); 330 }; 331 332 static sp<AudioFlingerClient> gAudioFlingerClient; 333 static sp<AudioPolicyServiceClient> gAudioPolicyServiceClient; 334 friend class AudioFlingerClient; 335 friend class AudioPolicyServiceClient; 336 337 static Mutex gLock; 338 static sp<IAudioFlinger> gAudioFlinger; 339 static audio_error_callback gAudioErrorCallback; 340 341 static size_t gInBuffSize; 342 // previous parameters for recording buffer size queries 343 static uint32_t gPrevInSamplingRate; 344 static audio_format_t gPrevInFormat; 345 static audio_channel_mask_t gPrevInChannelMask; 346 347 static sp<IAudioPolicyService> gAudioPolicyService; 348 349 // list of output descriptors containing cached parameters 350 // (sampling rate, framecount, channel count...) 351 static DefaultKeyedVector<audio_io_handle_t, OutputDescriptor *> gOutputs; 352}; 353 354}; // namespace android 355 356#endif /*ANDROID_AUDIOSYSTEM_H_*/ 357