AudioSystem.h revision 211eeaf17e5565b68447d29799dbf158a33cf4cf
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 30namespace android { 31 32typedef void (*audio_error_callback)(status_t err); 33 34class IAudioPolicyService; 35class String8; 36 37class AudioSystem 38{ 39public: 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, int output); 59 static status_t getStreamVolume(audio_stream_type_t stream, float* volume, int 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 has been active 69 // in the past inPastMs milliseconds 70 static status_t isStreamActive(audio_stream_type_t 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, audio_stream_type_t stream = AUDIO_STREAM_DEFAULT); 87 static status_t getOutputFrameCount(int* frameCount, audio_stream_type_t stream = AUDIO_STREAM_DEFAULT); 88 static status_t getOutputLatency(uint32_t* latency, audio_stream_type_t stream = AUDIO_STREAM_DEFAULT); 89 90 // DEPRECATED 91 static status_t getOutputSamplingRate(int* samplingRate, int stream = AUDIO_STREAM_DEFAULT); 92 93 // DEPRECATED 94 static status_t getOutputFrameCount(int* frameCount, int stream = AUDIO_STREAM_DEFAULT); 95 96 static bool routedToA2dpOutput(audio_stream_type_t streamType); 97 98 static status_t getInputBufferSize(uint32_t sampleRate, audio_format_t format, int channelCount, 99 size_t* buffSize); 100 101 static status_t setVoiceVolume(float volume); 102 103 // return the number of audio frames written by AudioFlinger to audio HAL and 104 // audio dsp to DAC since the output on which the specified stream is playing 105 // has exited standby. 106 // returned status (from utils/Errors.h) can be: 107 // - NO_ERROR: successful operation, halFrames and dspFrames point to valid data 108 // - INVALID_OPERATION: Not supported on current hardware platform 109 // - BAD_VALUE: invalid parameter 110 // NOTE: this feature is not supported on all hardware platforms and it is 111 // necessary to check returned status before using the returned values. 112 static status_t getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, audio_stream_type_t stream = AUDIO_STREAM_DEFAULT); 113 114 static unsigned int getInputFramesLost(audio_io_handle_t ioHandle); 115 116 static int newAudioSessionId(); 117 static void acquireAudioSessionId(int audioSession); 118 static void releaseAudioSessionId(int audioSession); 119 120 // types of io configuration change events received with ioConfigChanged() 121 enum io_config_event { 122 OUTPUT_OPENED, 123 OUTPUT_CLOSED, 124 OUTPUT_CONFIG_CHANGED, 125 INPUT_OPENED, 126 INPUT_CLOSED, 127 INPUT_CONFIG_CHANGED, 128 STREAM_CONFIG_CHANGED, 129 NUM_CONFIG_EVENTS 130 }; 131 132 // audio output descritor used to cache output configurations in client process to avoid frequent calls 133 // through IAudioFlinger 134 class OutputDescriptor { 135 public: 136 OutputDescriptor() 137 : samplingRate(0), format(AUDIO_FORMAT_DEFAULT), channels(0), frameCount(0), latency(0) {} 138 139 uint32_t samplingRate; 140 int32_t format; 141 int32_t channels; 142 size_t frameCount; 143 uint32_t latency; 144 }; 145 146 // 147 // IAudioPolicyService interface (see AudioPolicyInterface for method descriptions) 148 // 149 static status_t setDeviceConnectionState(audio_devices_t device, audio_policy_dev_state_t state, const char *device_address); 150 static audio_policy_dev_state_t getDeviceConnectionState(audio_devices_t device, const char *device_address); 151 static status_t setPhoneState(audio_mode_t state); 152 static status_t setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config); 153 static audio_policy_forced_cfg_t getForceUse(audio_policy_force_use_t usage); 154 static audio_io_handle_t getOutput(audio_stream_type_t stream, 155 uint32_t samplingRate = 0, 156 audio_format_t format = AUDIO_FORMAT_DEFAULT, 157 uint32_t channels = AUDIO_CHANNEL_OUT_STEREO, 158 audio_policy_output_flags_t flags = AUDIO_POLICY_OUTPUT_FLAG_INDIRECT); 159 static status_t startOutput(audio_io_handle_t output, 160 audio_stream_type_t stream, 161 int session = 0); 162 static status_t stopOutput(audio_io_handle_t output, 163 audio_stream_type_t stream, 164 int session = 0); 165 static void releaseOutput(audio_io_handle_t output); 166 static audio_io_handle_t getInput(audio_source_t inputSource, 167 uint32_t samplingRate = 0, 168 audio_format_t format = AUDIO_FORMAT_DEFAULT, 169 uint32_t channels = AUDIO_CHANNEL_IN_MONO, 170 audio_in_acoustics_t acoustics = (audio_in_acoustics_t)0, 171 int sessionId = 0); 172 static status_t startInput(audio_io_handle_t input); 173 static status_t stopInput(audio_io_handle_t input); 174 static void releaseInput(audio_io_handle_t input); 175 static status_t initStreamVolume(audio_stream_type_t stream, 176 int indexMin, 177 int indexMax); 178 static status_t setStreamVolumeIndex(audio_stream_type_t stream, 179 int index, 180 audio_devices_t device); 181 static status_t getStreamVolumeIndex(audio_stream_type_t stream, 182 int *index, 183 audio_devices_t device); 184 185 static uint32_t getStrategyForStream(audio_stream_type_t stream); 186 static uint32_t getDevicesForStream(audio_stream_type_t stream); 187 188 static audio_io_handle_t getOutputForEffect(effect_descriptor_t *desc); 189 static status_t registerEffect(effect_descriptor_t *desc, 190 audio_io_handle_t io, 191 uint32_t strategy, 192 int session, 193 int id); 194 static status_t unregisterEffect(int id); 195 static status_t setEffectEnabled(int id, bool enabled); 196 197 // clear stream to output mapping cache (gStreamOutputMap) 198 // and output configuration cache (gOutputs) 199 static void clearAudioConfigCache(); 200 201 static const sp<IAudioPolicyService>& get_audio_policy_service(); 202 203 // ---------------------------------------------------------------------------- 204 205private: 206 207 class AudioFlingerClient: public IBinder::DeathRecipient, public BnAudioFlingerClient 208 { 209 public: 210 AudioFlingerClient() { 211 } 212 213 // DeathRecipient 214 virtual void binderDied(const wp<IBinder>& who); 215 216 // IAudioFlingerClient 217 218 // indicate a change in the configuration of an output or input: keeps the cached 219 // values for output/input parameters upto date in client process 220 virtual void ioConfigChanged(int event, int ioHandle, void *param2); 221 }; 222 223 class AudioPolicyServiceClient: public IBinder::DeathRecipient 224 { 225 public: 226 AudioPolicyServiceClient() { 227 } 228 229 // DeathRecipient 230 virtual void binderDied(const wp<IBinder>& who); 231 }; 232 233 static sp<AudioFlingerClient> gAudioFlingerClient; 234 static sp<AudioPolicyServiceClient> gAudioPolicyServiceClient; 235 friend class AudioFlingerClient; 236 friend class AudioPolicyServiceClient; 237 238 static Mutex gLock; 239 static sp<IAudioFlinger> gAudioFlinger; 240 static audio_error_callback gAudioErrorCallback; 241 242 static size_t gInBuffSize; 243 // previous parameters for recording buffer size queries 244 static uint32_t gPrevInSamplingRate; 245 static audio_format_t gPrevInFormat; 246 static int gPrevInChannelCount; 247 248 static sp<IAudioPolicyService> gAudioPolicyService; 249 250 // mapping between stream types and outputs 251 static DefaultKeyedVector<audio_stream_type_t, audio_io_handle_t> gStreamOutputMap; 252 // list of output descriptors containing cached parameters 253 // (sampling rate, framecount, channel count...) 254 static DefaultKeyedVector<audio_io_handle_t, OutputDescriptor *> gOutputs; 255}; 256 257}; // namespace android 258 259#endif /*ANDROID_AUDIOSYSTEM_H_*/ 260