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 <utils/RefBase.h> 21 #include <utils/threads.h> 22 #include <media/IAudioFlinger.h> 23 24 #include <system/audio.h> 25 #include <system/audio_policy.h> 26 27 /* XXX: Should be include by all the users instead */ 28 #include <media/AudioParameter.h> 29 30 namespace android { 31 32 typedef void (*audio_error_callback)(status_t err); 33 34 class IAudioPolicyService; 35 class String8; 36 37 class AudioSystem 38 { 39 public: 40 41 /* These are static methods to control the system-wide AudioFlinger 42 * only privileged processes can have access to them 43 */ 44 45 // mute/unmute microphone 46 static status_t muteMicrophone(bool state); 47 static status_t isMicrophoneMuted(bool *state); 48 49 // set/get master volume 50 static status_t setMasterVolume(float value); 51 static status_t getMasterVolume(float* volume); 52 53 // mute/unmute audio outputs 54 static status_t setMasterMute(bool mute); 55 static status_t getMasterMute(bool* mute); 56 57 // set/get stream volume on specified output 58 static status_t setStreamVolume(audio_stream_type_t stream, float value, 59 audio_io_handle_t output); 60 static status_t getStreamVolume(audio_stream_type_t stream, float* volume, 61 audio_io_handle_t output); 62 63 // mute/unmute stream 64 static status_t setStreamMute(audio_stream_type_t stream, bool mute); 65 static status_t getStreamMute(audio_stream_type_t stream, bool* mute); 66 67 // set audio mode in audio hardware 68 static status_t setMode(audio_mode_t mode); 69 70 // returns true in *state if tracks are active on the specified stream or has been active 71 // in the past inPastMs milliseconds 72 static status_t isStreamActive(audio_stream_type_t stream, bool *state, uint32_t inPastMs = 0); 73 // returns true in *state if a recorder is currently recording with the specified source 74 static status_t isSourceActive(audio_source_t source, bool *state); 75 76 // set/get audio hardware parameters. The function accepts a list of parameters 77 // key value pairs in the form: key1=value1;key2=value2;... 78 // Some keys are reserved for standard parameters (See AudioParameter class). 79 static status_t setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs); 80 static String8 getParameters(audio_io_handle_t ioHandle, const String8& keys); 81 82 static void setErrorCallback(audio_error_callback cb); 83 84 // helper function to obtain AudioFlinger service handle 85 static const sp<IAudioFlinger>& get_audio_flinger(); 86 87 static float linearToLog(int volume); 88 static int logToLinear(float volume); 89 90 static status_t getOutputSamplingRate(int* samplingRate, audio_stream_type_t stream = AUDIO_STREAM_DEFAULT); 91 static status_t getOutputFrameCount(int* frameCount, audio_stream_type_t stream = AUDIO_STREAM_DEFAULT); 92 static status_t getOutputLatency(uint32_t* latency, audio_stream_type_t stream = AUDIO_STREAM_DEFAULT); 93 static status_t getSamplingRate(audio_io_handle_t output, 94 audio_stream_type_t streamType, 95 int* samplingRate); 96 // returns the number of frames per audio HAL write buffer. Corresponds to 97 // audio_stream->get_buffer_size()/audio_stream_frame_size() 98 static status_t getFrameCount(audio_io_handle_t output, 99 audio_stream_type_t stream, 100 int* frameCount); 101 // returns the audio output stream latency in ms. Corresponds to 102 // audio_stream_out->get_latency() 103 static status_t getLatency(audio_io_handle_t output, 104 audio_stream_type_t stream, 105 uint32_t* latency); 106 107 // DEPRECATED 108 static status_t getOutputSamplingRate(int* samplingRate, int stream = AUDIO_STREAM_DEFAULT); 109 110 // DEPRECATED 111 static status_t getOutputFrameCount(int* frameCount, int stream = AUDIO_STREAM_DEFAULT); 112 113 static bool routedToA2dpOutput(audio_stream_type_t streamType); 114 115 static status_t getInputBufferSize(uint32_t sampleRate, audio_format_t format, 116 audio_channel_mask_t channelMask, size_t* buffSize); 117 118 static status_t setVoiceVolume(float volume); 119 120 // return the number of audio frames written by AudioFlinger to audio HAL and 121 // audio dsp to DAC since the output on which the specified stream is playing 122 // has exited standby. 123 // returned status (from utils/Errors.h) can be: 124 // - NO_ERROR: successful operation, halFrames and dspFrames point to valid data 125 // - INVALID_OPERATION: Not supported on current hardware platform 126 // - BAD_VALUE: invalid parameter 127 // NOTE: this feature is not supported on all hardware platforms and it is 128 // necessary to check returned status before using the returned values. 129 static status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, audio_stream_type_t stream = AUDIO_STREAM_DEFAULT); 130 131 // return the number of input frames lost by HAL implementation, or 0 if the handle is invalid 132 static unsigned int getInputFramesLost(audio_io_handle_t ioHandle); 133 134 static int newAudioSessionId(); 135 static void acquireAudioSessionId(int audioSession); 136 static void releaseAudioSessionId(int audioSession); 137 138 // types of io configuration change events received with ioConfigChanged() 139 enum io_config_event { 140 OUTPUT_OPENED, 141 OUTPUT_CLOSED, 142 OUTPUT_CONFIG_CHANGED, 143 INPUT_OPENED, 144 INPUT_CLOSED, 145 INPUT_CONFIG_CHANGED, 146 STREAM_CONFIG_CHANGED, 147 NUM_CONFIG_EVENTS 148 }; 149 150 // audio output descriptor used to cache output configurations in client process to avoid frequent calls 151 // through IAudioFlinger 152 class OutputDescriptor { 153 public: 154 OutputDescriptor() 155 : samplingRate(0), format(AUDIO_FORMAT_DEFAULT), channels(0), frameCount(0), latency(0) {} 156 157 uint32_t samplingRate; 158 int32_t format; 159 int32_t channels; 160 size_t frameCount; 161 uint32_t latency; 162 }; 163 164 // Events used to synchronize actions between audio sessions. 165 // For instance SYNC_EVENT_PRESENTATION_COMPLETE can be used to delay recording start until playback 166 // is complete on another audio session. 167 // See definitions in MediaSyncEvent.java 168 enum sync_event_t { 169 SYNC_EVENT_SAME = -1, // used internally to indicate restart with same event 170 SYNC_EVENT_NONE = 0, 171 SYNC_EVENT_PRESENTATION_COMPLETE, 172 173 // 174 // Define new events here: SYNC_EVENT_START, SYNC_EVENT_STOP, SYNC_EVENT_TIME ... 175 // 176 SYNC_EVENT_CNT, 177 }; 178 179 // Timeout for synchronous record start. Prevents from blocking the record thread forever 180 // if the trigger event is not fired. 181 static const uint32_t kSyncRecordStartTimeOutMs = 30000; 182 183 // 184 // IAudioPolicyService interface (see AudioPolicyInterface for method descriptions) 185 // 186 static status_t setDeviceConnectionState(audio_devices_t device, audio_policy_dev_state_t state, const char *device_address); 187 static audio_policy_dev_state_t getDeviceConnectionState(audio_devices_t device, const char *device_address); 188 static status_t setPhoneState(audio_mode_t state); 189 static status_t setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config); 190 static audio_policy_forced_cfg_t getForceUse(audio_policy_force_use_t usage); 191 static audio_io_handle_t getOutput(audio_stream_type_t stream, 192 uint32_t samplingRate = 0, 193 audio_format_t format = AUDIO_FORMAT_DEFAULT, 194 audio_channel_mask_t channelMask = AUDIO_CHANNEL_OUT_STEREO, 195 audio_output_flags_t flags = AUDIO_OUTPUT_FLAG_NONE); 196 static status_t startOutput(audio_io_handle_t output, 197 audio_stream_type_t stream, 198 int session = 0); 199 static status_t stopOutput(audio_io_handle_t output, 200 audio_stream_type_t stream, 201 int session = 0); 202 static void releaseOutput(audio_io_handle_t output); 203 static audio_io_handle_t getInput(audio_source_t inputSource, 204 uint32_t samplingRate = 0, 205 audio_format_t format = AUDIO_FORMAT_DEFAULT, 206 audio_channel_mask_t channelMask = AUDIO_CHANNEL_IN_MONO, 207 int sessionId = 0); 208 static status_t startInput(audio_io_handle_t input); 209 static status_t stopInput(audio_io_handle_t input); 210 static void releaseInput(audio_io_handle_t input); 211 static status_t initStreamVolume(audio_stream_type_t stream, 212 int indexMin, 213 int indexMax); 214 static status_t setStreamVolumeIndex(audio_stream_type_t stream, 215 int index, 216 audio_devices_t device); 217 static status_t getStreamVolumeIndex(audio_stream_type_t stream, 218 int *index, 219 audio_devices_t device); 220 221 static uint32_t getStrategyForStream(audio_stream_type_t stream); 222 static audio_devices_t getDevicesForStream(audio_stream_type_t stream); 223 224 static audio_io_handle_t getOutputForEffect(const effect_descriptor_t *desc); 225 static status_t registerEffect(const effect_descriptor_t *desc, 226 audio_io_handle_t io, 227 uint32_t strategy, 228 int session, 229 int id); 230 static status_t unregisterEffect(int id); 231 static status_t setEffectEnabled(int id, bool enabled); 232 233 // clear stream to output mapping cache (gStreamOutputMap) 234 // and output configuration cache (gOutputs) 235 static void clearAudioConfigCache(); 236 237 static const sp<IAudioPolicyService>& get_audio_policy_service(); 238 239 // helpers for android.media.AudioManager.getProperty(), see description there for meaning 240 static int32_t getPrimaryOutputSamplingRate(); 241 static int32_t getPrimaryOutputFrameCount(); 242 243 // ---------------------------------------------------------------------------- 244 245 private: 246 247 class AudioFlingerClient: public IBinder::DeathRecipient, public BnAudioFlingerClient 248 { 249 public: 250 AudioFlingerClient() { 251 } 252 253 // DeathRecipient 254 virtual void binderDied(const wp<IBinder>& who); 255 256 // IAudioFlingerClient 257 258 // indicate a change in the configuration of an output or input: keeps the cached 259 // values for output/input parameters up-to-date in client process 260 virtual void ioConfigChanged(int event, audio_io_handle_t ioHandle, const void *param2); 261 }; 262 263 class AudioPolicyServiceClient: public IBinder::DeathRecipient 264 { 265 public: 266 AudioPolicyServiceClient() { 267 } 268 269 // DeathRecipient 270 virtual void binderDied(const wp<IBinder>& who); 271 }; 272 273 static sp<AudioFlingerClient> gAudioFlingerClient; 274 static sp<AudioPolicyServiceClient> gAudioPolicyServiceClient; 275 friend class AudioFlingerClient; 276 friend class AudioPolicyServiceClient; 277 278 static Mutex gLock; 279 static sp<IAudioFlinger> gAudioFlinger; 280 static audio_error_callback gAudioErrorCallback; 281 282 static size_t gInBuffSize; 283 // previous parameters for recording buffer size queries 284 static uint32_t gPrevInSamplingRate; 285 static audio_format_t gPrevInFormat; 286 static audio_channel_mask_t gPrevInChannelMask; 287 288 static sp<IAudioPolicyService> gAudioPolicyService; 289 290 // mapping between stream types and outputs 291 static DefaultKeyedVector<audio_stream_type_t, audio_io_handle_t> gStreamOutputMap; 292 // list of output descriptors containing cached parameters 293 // (sampling rate, framecount, channel count...) 294 static DefaultKeyedVector<audio_io_handle_t, OutputDescriptor *> gOutputs; 295 }; 296 297 }; // namespace android 298 299 #endif /*ANDROID_AUDIOSYSTEM_H_*/ 300
