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(int stream, float value, int output); 59 static status_t getStreamVolume(int stream, float* volume, int output); 60 61 // mute/unmute stream 62 static status_t setStreamMute(int stream, bool mute); 63 static status_t getStreamMute(int stream, bool* mute); 64 65 // set audio mode in audio hardware (see audio_mode_t) 66 static status_t setMode(int mode); 67 68 // returns true in *state if tracks are active on the specified stream or has been active 69 // in the past inPastMs milliseconds 70 static status_t isStreamActive(int stream, bool *state, uint32_t inPastMs = 0); 71 72 // set/get audio hardware parameters. The function accepts a list of parameters 73 // key value pairs in the form: key1=value1;key2=value2;... 74 // Some keys are reserved for standard parameters (See AudioParameter class). 75 static status_t setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs); 76 static String8 getParameters(audio_io_handle_t ioHandle, const String8& keys); 77 78 static void setErrorCallback(audio_error_callback cb); 79 80 // helper function to obtain AudioFlinger service handle 81 static const sp<IAudioFlinger>& get_audio_flinger(); 82 83 static float linearToLog(int volume); 84 static int logToLinear(float volume); 85 86 static status_t getOutputSamplingRate(int* samplingRate, int stream = AUDIO_STREAM_DEFAULT); 87 static status_t getOutputFrameCount(int* frameCount, int stream = AUDIO_STREAM_DEFAULT); 88 static status_t getOutputLatency(uint32_t* latency, int stream = AUDIO_STREAM_DEFAULT); 89 90 static bool routedToA2dpOutput(int streamType); 91 92 static status_t getInputBufferSize(uint32_t sampleRate, int format, int channelCount, 93 size_t* buffSize); 94 95 static status_t setVoiceVolume(float volume); 96 97 // return the number of audio frames written by AudioFlinger to audio HAL and 98 // audio dsp to DAC since the output on which the specified stream is playing 99 // has exited standby. 100 // returned status (from utils/Errors.h) can be: 101 // - NO_ERROR: successful operation, halFrames and dspFrames point to valid data 102 // - INVALID_OPERATION: Not supported on current hardware platform 103 // - BAD_VALUE: invalid parameter 104 // NOTE: this feature is not supported on all hardware platforms and it is 105 // necessary to check returned status before using the returned values. 106 static status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int stream = AUDIO_STREAM_DEFAULT); 107 108 static unsigned int getInputFramesLost(audio_io_handle_t ioHandle); 109 110 static int newAudioSessionId(); 111 static void acquireAudioSessionId(int audioSession); 112 static void releaseAudioSessionId(int audioSession); 113 114 // types of io configuration change events received with ioConfigChanged() 115 enum io_config_event { 116 OUTPUT_OPENED, 117 OUTPUT_CLOSED, 118 OUTPUT_CONFIG_CHANGED, 119 INPUT_OPENED, 120 INPUT_CLOSED, 121 INPUT_CONFIG_CHANGED, 122 STREAM_CONFIG_CHANGED, 123 NUM_CONFIG_EVENTS 124 }; 125 126 // audio output descritor used to cache output configurations in client process to avoid frequent calls 127 // through IAudioFlinger 128 class OutputDescriptor { 129 public: OutputDescriptor()130 OutputDescriptor() 131 : samplingRate(0), format(0), channels(0), frameCount(0), latency(0) {} 132 133 uint32_t samplingRate; 134 int32_t format; 135 int32_t channels; 136 size_t frameCount; 137 uint32_t latency; 138 }; 139 140 // 141 // IAudioPolicyService interface (see AudioPolicyInterface for method descriptions) 142 // 143 static status_t setDeviceConnectionState(audio_devices_t device, audio_policy_dev_state_t state, const char *device_address); 144 static audio_policy_dev_state_t getDeviceConnectionState(audio_devices_t device, const char *device_address); 145 static status_t setPhoneState(int state); 146 static status_t setRingerMode(uint32_t mode, uint32_t mask); 147 static status_t setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config); 148 static audio_policy_forced_cfg_t getForceUse(audio_policy_force_use_t usage); 149 static audio_io_handle_t getOutput(audio_stream_type_t stream, 150 uint32_t samplingRate = 0, 151 uint32_t format = AUDIO_FORMAT_DEFAULT, 152 uint32_t channels = AUDIO_CHANNEL_OUT_STEREO, 153 audio_policy_output_flags_t flags = AUDIO_POLICY_OUTPUT_FLAG_INDIRECT); 154 static status_t startOutput(audio_io_handle_t output, 155 audio_stream_type_t stream, 156 int session = 0); 157 static status_t stopOutput(audio_io_handle_t output, 158 audio_stream_type_t stream, 159 int session = 0); 160 static void releaseOutput(audio_io_handle_t output); 161 static audio_io_handle_t getInput(int inputSource, 162 uint32_t samplingRate = 0, 163 uint32_t format = AUDIO_FORMAT_DEFAULT, 164 uint32_t channels = AUDIO_CHANNEL_IN_MONO, 165 audio_in_acoustics_t acoustics = (audio_in_acoustics_t)0, 166 int sessionId = 0); 167 static status_t startInput(audio_io_handle_t input); 168 static status_t stopInput(audio_io_handle_t input); 169 static void releaseInput(audio_io_handle_t input); 170 static status_t initStreamVolume(audio_stream_type_t stream, 171 int indexMin, 172 int indexMax); 173 static status_t setStreamVolumeIndex(audio_stream_type_t stream, int index); 174 static status_t getStreamVolumeIndex(audio_stream_type_t stream, int *index); 175 176 static uint32_t getStrategyForStream(audio_stream_type_t stream); 177 static uint32_t getDevicesForStream(audio_stream_type_t stream); 178 179 static audio_io_handle_t getOutputForEffect(effect_descriptor_t *desc); 180 static status_t registerEffect(effect_descriptor_t *desc, 181 audio_io_handle_t io, 182 uint32_t strategy, 183 int session, 184 int id); 185 static status_t unregisterEffect(int id); 186 static status_t setEffectEnabled(int id, bool enabled); 187 188 // clear stream to output mapping cache (gStreamOutputMap) 189 // and output configuration cache (gOutputs) 190 static void clearAudioConfigCache(); 191 192 static const sp<IAudioPolicyService>& get_audio_policy_service(); 193 194 // ---------------------------------------------------------------------------- 195 196 private: 197 198 class AudioFlingerClient: public IBinder::DeathRecipient, public BnAudioFlingerClient 199 { 200 public: AudioFlingerClient()201 AudioFlingerClient() { 202 } 203 204 // DeathRecipient 205 virtual void binderDied(const wp<IBinder>& who); 206 207 // IAudioFlingerClient 208 209 // indicate a change in the configuration of an output or input: keeps the cached 210 // values for output/input parameters upto date in client process 211 virtual void ioConfigChanged(int event, int ioHandle, void *param2); 212 }; 213 214 class AudioPolicyServiceClient: public IBinder::DeathRecipient 215 { 216 public: AudioPolicyServiceClient()217 AudioPolicyServiceClient() { 218 } 219 220 // DeathRecipient 221 virtual void binderDied(const wp<IBinder>& who); 222 }; 223 224 static sp<AudioFlingerClient> gAudioFlingerClient; 225 static sp<AudioPolicyServiceClient> gAudioPolicyServiceClient; 226 friend class AudioFlingerClient; 227 friend class AudioPolicyServiceClient; 228 229 static Mutex gLock; 230 static sp<IAudioFlinger> gAudioFlinger; 231 static audio_error_callback gAudioErrorCallback; 232 233 static size_t gInBuffSize; 234 // previous parameters for recording buffer size queries 235 static uint32_t gPrevInSamplingRate; 236 static int gPrevInFormat; 237 static int gPrevInChannelCount; 238 239 static sp<IAudioPolicyService> gAudioPolicyService; 240 241 // mapping between stream types and outputs 242 static DefaultKeyedVector<int, audio_io_handle_t> gStreamOutputMap; 243 // list of output descriptors containing cached parameters 244 // (sampling rate, framecount, channel count...) 245 static DefaultKeyedVector<audio_io_handle_t, OutputDescriptor *> gOutputs; 246 }; 247 248 }; // namespace android 249 250 #endif /*ANDROID_AUDIOSYSTEM_H_*/ 251