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