Home | History | Annotate | Download | only in libmedia 
      1 /*
      2  * Copyright (C) 2006-2007 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 #define LOG_TAG "AudioSystem"
     18 //#define LOG_NDEBUG 0
     19 
     20 #include <utils/Log.h>
     21 #include <binder/IServiceManager.h>
     22 #include <media/AudioSystem.h>
     23 #include <media/IAudioPolicyService.h>
     24 #include <math.h>
     25 
     26 #include <system/audio.h>
     27 
     28 // ----------------------------------------------------------------------------
     29 
     30 namespace android {
     31 
     32 // client singleton for AudioFlinger binder interface
     33 Mutex AudioSystem::gLock;
     34 sp<IAudioFlinger> AudioSystem::gAudioFlinger;
     35 sp<AudioSystem::AudioFlingerClient> AudioSystem::gAudioFlingerClient;
     36 audio_error_callback AudioSystem::gAudioErrorCallback = NULL;
     37 // Cached values
     38 DefaultKeyedVector<int, audio_io_handle_t> AudioSystem::gStreamOutputMap(0);
     39 DefaultKeyedVector<audio_io_handle_t, AudioSystem::OutputDescriptor *> AudioSystem::gOutputs(0);
     40 
     41 // Cached values for recording queries
     42 uint32_t AudioSystem::gPrevInSamplingRate = 16000;
     43 int AudioSystem::gPrevInFormat = AUDIO_FORMAT_PCM_16_BIT;
     44 int AudioSystem::gPrevInChannelCount = 1;
     45 size_t AudioSystem::gInBuffSize = 0;
     46 
     47 
     48 // establish binder interface to AudioFlinger service
     49 const sp<IAudioFlinger>& AudioSystem::get_audio_flinger()
     50 {
     51     Mutex::Autolock _l(gLock);
     52     if (gAudioFlinger.get() == 0) {
     53         sp<IServiceManager> sm = defaultServiceManager();
     54         sp<IBinder> binder;
     55         do {
     56             binder = sm->getService(String16("media.audio_flinger"));
     57             if (binder != 0)
     58                 break;
     59             LOGW("AudioFlinger not published, waiting...");
     60             usleep(500000); // 0.5 s
     61         } while(true);
     62         if (gAudioFlingerClient == NULL) {
     63             gAudioFlingerClient = new AudioFlingerClient();
     64         } else {
     65             if (gAudioErrorCallback) {
     66                 gAudioErrorCallback(NO_ERROR);
     67             }
     68          }
     69         binder->linkToDeath(gAudioFlingerClient);
     70         gAudioFlinger = interface_cast<IAudioFlinger>(binder);
     71         gAudioFlinger->registerClient(gAudioFlingerClient);
     72     }
     73     LOGE_IF(gAudioFlinger==0, "no AudioFlinger!?");
     74 
     75     return gAudioFlinger;
     76 }
     77 
     78 status_t AudioSystem::muteMicrophone(bool state) {
     79     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
     80     if (af == 0) return PERMISSION_DENIED;
     81     return af->setMicMute(state);
     82 }
     83 
     84 status_t AudioSystem::isMicrophoneMuted(bool* state) {
     85     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
     86     if (af == 0) return PERMISSION_DENIED;
     87     *state = af->getMicMute();
     88     return NO_ERROR;
     89 }
     90 
     91 status_t AudioSystem::setMasterVolume(float value)
     92 {
     93     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
     94     if (af == 0) return PERMISSION_DENIED;
     95     af->setMasterVolume(value);
     96     return NO_ERROR;
     97 }
     98 
     99 status_t AudioSystem::setMasterMute(bool mute)
    100 {
    101     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    102     if (af == 0) return PERMISSION_DENIED;
    103     af->setMasterMute(mute);
    104     return NO_ERROR;
    105 }
    106 
    107 status_t AudioSystem::getMasterVolume(float* volume)
    108 {
    109     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    110     if (af == 0) return PERMISSION_DENIED;
    111     *volume = af->masterVolume();
    112     return NO_ERROR;
    113 }
    114 
    115 status_t AudioSystem::getMasterMute(bool* mute)
    116 {
    117     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    118     if (af == 0) return PERMISSION_DENIED;
    119     *mute = af->masterMute();
    120     return NO_ERROR;
    121 }
    122 
    123 status_t AudioSystem::setStreamVolume(int stream, float value, int output)
    124 {
    125     if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
    126     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    127     if (af == 0) return PERMISSION_DENIED;
    128     af->setStreamVolume(stream, value, output);
    129     return NO_ERROR;
    130 }
    131 
    132 status_t AudioSystem::setStreamMute(int stream, bool mute)
    133 {
    134     if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
    135     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    136     if (af == 0) return PERMISSION_DENIED;
    137     af->setStreamMute(stream, mute);
    138     return NO_ERROR;
    139 }
    140 
    141 status_t AudioSystem::getStreamVolume(int stream, float* volume, int output)
    142 {
    143     if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
    144     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    145     if (af == 0) return PERMISSION_DENIED;
    146     *volume = af->streamVolume(stream, output);
    147     return NO_ERROR;
    148 }
    149 
    150 status_t AudioSystem::getStreamMute(int stream, bool* mute)
    151 {
    152     if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
    153     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    154     if (af == 0) return PERMISSION_DENIED;
    155     *mute = af->streamMute(stream);
    156     return NO_ERROR;
    157 }
    158 
    159 status_t AudioSystem::setMode(int mode)
    160 {
    161     if (mode >= AUDIO_MODE_CNT) return BAD_VALUE;
    162     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    163     if (af == 0) return PERMISSION_DENIED;
    164     return af->setMode(mode);
    165 }
    166 
    167 status_t AudioSystem::setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs) {
    168     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    169     if (af == 0) return PERMISSION_DENIED;
    170     return af->setParameters(ioHandle, keyValuePairs);
    171 }
    172 
    173 String8 AudioSystem::getParameters(audio_io_handle_t ioHandle, const String8& keys) {
    174     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    175     String8 result = String8("");
    176     if (af == 0) return result;
    177 
    178     result = af->getParameters(ioHandle, keys);
    179     return result;
    180 }
    181 
    182 // convert volume steps to natural log scale
    183 
    184 // change this value to change volume scaling
    185 static const float dBPerStep = 0.5f;
    186 // shouldn't need to touch these
    187 static const float dBConvert = -dBPerStep * 2.302585093f / 20.0f;
    188 static const float dBConvertInverse = 1.0f / dBConvert;
    189 
    190 float AudioSystem::linearToLog(int volume)
    191 {
    192     // float v = volume ? exp(float(100 - volume) * dBConvert) : 0;
    193     // LOGD("linearToLog(%d)=%f", volume, v);
    194     // return v;
    195     return volume ? exp(float(100 - volume) * dBConvert) : 0;
    196 }
    197 
    198 int AudioSystem::logToLinear(float volume)
    199 {
    200     // int v = volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
    201     // LOGD("logTolinear(%d)=%f", v, volume);
    202     // return v;
    203     return volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
    204 }
    205 
    206 status_t AudioSystem::getOutputSamplingRate(int* samplingRate, int streamType)
    207 {
    208     OutputDescriptor *outputDesc;
    209     audio_io_handle_t output;
    210 
    211     if (streamType == AUDIO_STREAM_DEFAULT) {
    212         streamType = AUDIO_STREAM_MUSIC;
    213     }
    214 
    215     output = getOutput((audio_stream_type_t)streamType);
    216     if (output == 0) {
    217         return PERMISSION_DENIED;
    218     }
    219 
    220     gLock.lock();
    221     outputDesc = AudioSystem::gOutputs.valueFor(output);
    222     if (outputDesc == 0) {
    223         LOGV("getOutputSamplingRate() no output descriptor for output %d in gOutputs", output);
    224         gLock.unlock();
    225         const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    226         if (af == 0) return PERMISSION_DENIED;
    227         *samplingRate = af->sampleRate(output);
    228     } else {
    229         LOGV("getOutputSamplingRate() reading from output desc");
    230         *samplingRate = outputDesc->samplingRate;
    231         gLock.unlock();
    232     }
    233 
    234     LOGV("getOutputSamplingRate() streamType %d, output %d, sampling rate %d", streamType, output, *samplingRate);
    235 
    236     return NO_ERROR;
    237 }
    238 
    239 status_t AudioSystem::getOutputFrameCount(int* frameCount, int streamType)
    240 {
    241     OutputDescriptor *outputDesc;
    242     audio_io_handle_t output;
    243 
    244     if (streamType == AUDIO_STREAM_DEFAULT) {
    245         streamType = AUDIO_STREAM_MUSIC;
    246     }
    247 
    248     output = getOutput((audio_stream_type_t)streamType);
    249     if (output == 0) {
    250         return PERMISSION_DENIED;
    251     }
    252 
    253     gLock.lock();
    254     outputDesc = AudioSystem::gOutputs.valueFor(output);
    255     if (outputDesc == 0) {
    256         gLock.unlock();
    257         const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    258         if (af == 0) return PERMISSION_DENIED;
    259         *frameCount = af->frameCount(output);
    260     } else {
    261         *frameCount = outputDesc->frameCount;
    262         gLock.unlock();
    263     }
    264 
    265     LOGV("getOutputFrameCount() streamType %d, output %d, frameCount %d", streamType, output, *frameCount);
    266 
    267     return NO_ERROR;
    268 }
    269 
    270 status_t AudioSystem::getOutputLatency(uint32_t* latency, int streamType)
    271 {
    272     OutputDescriptor *outputDesc;
    273     audio_io_handle_t output;
    274 
    275     if (streamType == AUDIO_STREAM_DEFAULT) {
    276         streamType = AUDIO_STREAM_MUSIC;
    277     }
    278 
    279     output = getOutput((audio_stream_type_t)streamType);
    280     if (output == 0) {
    281         return PERMISSION_DENIED;
    282     }
    283 
    284     gLock.lock();
    285     outputDesc = AudioSystem::gOutputs.valueFor(output);
    286     if (outputDesc == 0) {
    287         gLock.unlock();
    288         const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    289         if (af == 0) return PERMISSION_DENIED;
    290         *latency = af->latency(output);
    291     } else {
    292         *latency = outputDesc->latency;
    293         gLock.unlock();
    294     }
    295 
    296     LOGV("getOutputLatency() streamType %d, output %d, latency %d", streamType, output, *latency);
    297 
    298     return NO_ERROR;
    299 }
    300 
    301 status_t AudioSystem::getInputBufferSize(uint32_t sampleRate, int format, int channelCount,
    302     size_t* buffSize)
    303 {
    304     // Do we have a stale gInBufferSize or are we requesting the input buffer size for new values
    305     if ((gInBuffSize == 0) || (sampleRate != gPrevInSamplingRate) || (format != gPrevInFormat)
    306         || (channelCount != gPrevInChannelCount)) {
    307         // save the request params
    308         gPrevInSamplingRate = sampleRate;
    309         gPrevInFormat = format;
    310         gPrevInChannelCount = channelCount;
    311 
    312         gInBuffSize = 0;
    313         const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    314         if (af == 0) {
    315             return PERMISSION_DENIED;
    316         }
    317         gInBuffSize = af->getInputBufferSize(sampleRate, format, channelCount);
    318     }
    319     *buffSize = gInBuffSize;
    320 
    321     return NO_ERROR;
    322 }
    323 
    324 status_t AudioSystem::setVoiceVolume(float value)
    325 {
    326     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    327     if (af == 0) return PERMISSION_DENIED;
    328     return af->setVoiceVolume(value);
    329 }
    330 
    331 status_t AudioSystem::getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int stream)
    332 {
    333     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    334     if (af == 0) return PERMISSION_DENIED;
    335 
    336     if (stream == AUDIO_STREAM_DEFAULT) {
    337         stream = AUDIO_STREAM_MUSIC;
    338     }
    339 
    340     return af->getRenderPosition(halFrames, dspFrames, getOutput((audio_stream_type_t)stream));
    341 }
    342 
    343 unsigned int AudioSystem::getInputFramesLost(audio_io_handle_t ioHandle) {
    344     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    345     unsigned int result = 0;
    346     if (af == 0) return result;
    347     if (ioHandle == 0) return result;
    348 
    349     result = af->getInputFramesLost(ioHandle);
    350     return result;
    351 }
    352 
    353 int AudioSystem::newAudioSessionId() {
    354     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    355     if (af == 0) return 0;
    356     return af->newAudioSessionId();
    357 }
    358 
    359 void AudioSystem::acquireAudioSessionId(int audioSession) {
    360     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    361     if (af != 0) {
    362         af->acquireAudioSessionId(audioSession);
    363     }
    364 }
    365 
    366 void AudioSystem::releaseAudioSessionId(int audioSession) {
    367     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
    368     if (af != 0) {
    369         af->releaseAudioSessionId(audioSession);
    370     }
    371 }
    372 
    373 // ---------------------------------------------------------------------------
    374 
    375 void AudioSystem::AudioFlingerClient::binderDied(const wp<IBinder>& who) {
    376     Mutex::Autolock _l(AudioSystem::gLock);
    377 
    378     AudioSystem::gAudioFlinger.clear();
    379     // clear output handles and stream to output map caches
    380     AudioSystem::gStreamOutputMap.clear();
    381     AudioSystem::gOutputs.clear();
    382 
    383     if (gAudioErrorCallback) {
    384         gAudioErrorCallback(DEAD_OBJECT);
    385     }
    386     LOGW("AudioFlinger server died!");
    387 }
    388 
    389 void AudioSystem::AudioFlingerClient::ioConfigChanged(int event, int ioHandle, void *param2) {
    390     LOGV("ioConfigChanged() event %d", event);
    391     OutputDescriptor *desc;
    392     uint32_t stream;
    393 
    394     if (ioHandle == 0) return;
    395 
    396     Mutex::Autolock _l(AudioSystem::gLock);
    397 
    398     switch (event) {
    399     case STREAM_CONFIG_CHANGED:
    400         if (param2 == 0) break;
    401         stream = *(uint32_t *)param2;
    402         LOGV("ioConfigChanged() STREAM_CONFIG_CHANGED stream %d, output %d", stream, ioHandle);
    403         if (gStreamOutputMap.indexOfKey(stream) >= 0) {
    404             gStreamOutputMap.replaceValueFor(stream, ioHandle);
    405         }
    406         break;
    407     case OUTPUT_OPENED: {
    408         if (gOutputs.indexOfKey(ioHandle) >= 0) {
    409             LOGV("ioConfigChanged() opening already existing output! %d", ioHandle);
    410             break;
    411         }
    412         if (param2 == 0) break;
    413         desc = (OutputDescriptor *)param2;
    414 
    415         OutputDescriptor *outputDesc =  new OutputDescriptor(*desc);
    416         gOutputs.add(ioHandle, outputDesc);
    417         LOGV("ioConfigChanged() new output samplingRate %d, format %d channels %d frameCount %d latency %d",
    418                 outputDesc->samplingRate, outputDesc->format, outputDesc->channels, outputDesc->frameCount, outputDesc->latency);
    419         } break;
    420     case OUTPUT_CLOSED: {
    421         if (gOutputs.indexOfKey(ioHandle) < 0) {
    422             LOGW("ioConfigChanged() closing unknow output! %d", ioHandle);
    423             break;
    424         }
    425         LOGV("ioConfigChanged() output %d closed", ioHandle);
    426 
    427         gOutputs.removeItem(ioHandle);
    428         for (int i = gStreamOutputMap.size() - 1; i >= 0 ; i--) {
    429             if (gStreamOutputMap.valueAt(i) == ioHandle) {
    430                 gStreamOutputMap.removeItemsAt(i);
    431             }
    432         }
    433         } break;
    434 
    435     case OUTPUT_CONFIG_CHANGED: {
    436         int index = gOutputs.indexOfKey(ioHandle);
    437         if (index < 0) {
    438             LOGW("ioConfigChanged() modifying unknow output! %d", ioHandle);
    439             break;
    440         }
    441         if (param2 == 0) break;
    442         desc = (OutputDescriptor *)param2;
    443 
    444         LOGV("ioConfigChanged() new config for output %d samplingRate %d, format %d channels %d frameCount %d latency %d",
    445                 ioHandle, desc->samplingRate, desc->format,
    446                 desc->channels, desc->frameCount, desc->latency);
    447         OutputDescriptor *outputDesc = gOutputs.valueAt(index);
    448         delete outputDesc;
    449         outputDesc =  new OutputDescriptor(*desc);
    450         gOutputs.replaceValueFor(ioHandle, outputDesc);
    451     } break;
    452     case INPUT_OPENED:
    453     case INPUT_CLOSED:
    454     case INPUT_CONFIG_CHANGED:
    455         break;
    456 
    457     }
    458 }
    459 
    460 void AudioSystem::setErrorCallback(audio_error_callback cb) {
    461     Mutex::Autolock _l(gLock);
    462     gAudioErrorCallback = cb;
    463 }
    464 
    465 bool AudioSystem::routedToA2dpOutput(int streamType) {
    466     switch(streamType) {
    467     case AUDIO_STREAM_MUSIC:
    468     case AUDIO_STREAM_VOICE_CALL:
    469     case AUDIO_STREAM_BLUETOOTH_SCO:
    470     case AUDIO_STREAM_SYSTEM:
    471         return true;
    472     default:
    473         return false;
    474     }
    475 }
    476 
    477 
    478 // client singleton for AudioPolicyService binder interface
    479 sp<IAudioPolicyService> AudioSystem::gAudioPolicyService;
    480 sp<AudioSystem::AudioPolicyServiceClient> AudioSystem::gAudioPolicyServiceClient;
    481 
    482 
    483 // establish binder interface to AudioFlinger service
    484 const sp<IAudioPolicyService>& AudioSystem::get_audio_policy_service()
    485 {
    486     gLock.lock();
    487     if (gAudioPolicyService.get() == 0) {
    488         sp<IServiceManager> sm = defaultServiceManager();
    489         sp<IBinder> binder;
    490         do {
    491             binder = sm->getService(String16("media.audio_policy"));
    492             if (binder != 0)
    493                 break;
    494             LOGW("AudioPolicyService not published, waiting...");
    495             usleep(500000); // 0.5 s
    496         } while(true);
    497         if (gAudioPolicyServiceClient == NULL) {
    498             gAudioPolicyServiceClient = new AudioPolicyServiceClient();
    499         }
    500         binder->linkToDeath(gAudioPolicyServiceClient);
    501         gAudioPolicyService = interface_cast<IAudioPolicyService>(binder);
    502         gLock.unlock();
    503     } else {
    504         gLock.unlock();
    505     }
    506     return gAudioPolicyService;
    507 }
    508 
    509 status_t AudioSystem::setDeviceConnectionState(audio_devices_t device,
    510                                                audio_policy_dev_state_t state,
    511                                                const char *device_address)
    512 {
    513     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    514     const char *address = "";
    515 
    516     if (aps == 0) return PERMISSION_DENIED;
    517 
    518     if (device_address != NULL) {
    519         address = device_address;
    520     }
    521 
    522     return aps->setDeviceConnectionState(device, state, address);
    523 }
    524 
    525 audio_policy_dev_state_t AudioSystem::getDeviceConnectionState(audio_devices_t device,
    526                                                   const char *device_address)
    527 {
    528     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    529     if (aps == 0) return AUDIO_POLICY_DEVICE_STATE_UNAVAILABLE;
    530 
    531     return aps->getDeviceConnectionState(device, device_address);
    532 }
    533 
    534 status_t AudioSystem::setPhoneState(int state)
    535 {
    536     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    537     if (aps == 0) return PERMISSION_DENIED;
    538 
    539     return aps->setPhoneState(state);
    540 }
    541 
    542 status_t AudioSystem::setRingerMode(uint32_t mode, uint32_t mask)
    543 {
    544     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    545     if (aps == 0) return PERMISSION_DENIED;
    546     return aps->setRingerMode(mode, mask);
    547 }
    548 
    549 status_t AudioSystem::setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config)
    550 {
    551     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    552     if (aps == 0) return PERMISSION_DENIED;
    553     return aps->setForceUse(usage, config);
    554 }
    555 
    556 audio_policy_forced_cfg_t AudioSystem::getForceUse(audio_policy_force_use_t usage)
    557 {
    558     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    559     if (aps == 0) return AUDIO_POLICY_FORCE_NONE;
    560     return aps->getForceUse(usage);
    561 }
    562 
    563 
    564 audio_io_handle_t AudioSystem::getOutput(audio_stream_type_t stream,
    565                                     uint32_t samplingRate,
    566                                     uint32_t format,
    567                                     uint32_t channels,
    568                                     audio_policy_output_flags_t flags)
    569 {
    570     audio_io_handle_t output = 0;
    571     // Do not use stream to output map cache if the direct output
    572     // flag is set or if we are likely to use a direct output
    573     // (e.g voice call stream @ 8kHz could use BT SCO device and be routed to
    574     // a direct output on some platforms).
    575     // TODO: the output cache and stream to output mapping implementation needs to
    576     // be reworked for proper operation with direct outputs. This code is too specific
    577     // to the first use case we want to cover (Voice Recognition and Voice Dialer over
    578     // Bluetooth SCO
    579     if ((flags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT) == 0 &&
    580         ((stream != AUDIO_STREAM_VOICE_CALL && stream != AUDIO_STREAM_BLUETOOTH_SCO) ||
    581          channels != AUDIO_CHANNEL_OUT_MONO ||
    582          (samplingRate != 8000 && samplingRate != 16000))) {
    583         Mutex::Autolock _l(gLock);
    584         output = AudioSystem::gStreamOutputMap.valueFor(stream);
    585         LOGV_IF((output != 0), "getOutput() read %d from cache for stream %d", output, stream);
    586     }
    587     if (output == 0) {
    588         const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    589         if (aps == 0) return 0;
    590         output = aps->getOutput(stream, samplingRate, format, channels, flags);
    591         if ((flags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT) == 0) {
    592             Mutex::Autolock _l(gLock);
    593             AudioSystem::gStreamOutputMap.add(stream, output);
    594         }
    595     }
    596     return output;
    597 }
    598 
    599 status_t AudioSystem::startOutput(audio_io_handle_t output,
    600                                   audio_stream_type_t stream,
    601                                   int session)
    602 {
    603     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    604     if (aps == 0) return PERMISSION_DENIED;
    605     return aps->startOutput(output, stream, session);
    606 }
    607 
    608 status_t AudioSystem::stopOutput(audio_io_handle_t output,
    609                                  audio_stream_type_t stream,
    610                                  int session)
    611 {
    612     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    613     if (aps == 0) return PERMISSION_DENIED;
    614     return aps->stopOutput(output, stream, session);
    615 }
    616 
    617 void AudioSystem::releaseOutput(audio_io_handle_t output)
    618 {
    619     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    620     if (aps == 0) return;
    621     aps->releaseOutput(output);
    622 }
    623 
    624 audio_io_handle_t AudioSystem::getInput(int inputSource,
    625                                     uint32_t samplingRate,
    626                                     uint32_t format,
    627                                     uint32_t channels,
    628                                     audio_in_acoustics_t acoustics,
    629                                     int sessionId)
    630 {
    631     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    632     if (aps == 0) return 0;
    633     return aps->getInput(inputSource, samplingRate, format, channels, acoustics, sessionId);
    634 }
    635 
    636 status_t AudioSystem::startInput(audio_io_handle_t input)
    637 {
    638     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    639     if (aps == 0) return PERMISSION_DENIED;
    640     return aps->startInput(input);
    641 }
    642 
    643 status_t AudioSystem::stopInput(audio_io_handle_t input)
    644 {
    645     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    646     if (aps == 0) return PERMISSION_DENIED;
    647     return aps->stopInput(input);
    648 }
    649 
    650 void AudioSystem::releaseInput(audio_io_handle_t input)
    651 {
    652     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    653     if (aps == 0) return;
    654     aps->releaseInput(input);
    655 }
    656 
    657 status_t AudioSystem::initStreamVolume(audio_stream_type_t stream,
    658                                     int indexMin,
    659                                     int indexMax)
    660 {
    661     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    662     if (aps == 0) return PERMISSION_DENIED;
    663     return aps->initStreamVolume(stream, indexMin, indexMax);
    664 }
    665 
    666 status_t AudioSystem::setStreamVolumeIndex(audio_stream_type_t stream, int index)
    667 {
    668     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    669     if (aps == 0) return PERMISSION_DENIED;
    670     return aps->setStreamVolumeIndex(stream, index);
    671 }
    672 
    673 status_t AudioSystem::getStreamVolumeIndex(audio_stream_type_t stream, int *index)
    674 {
    675     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    676     if (aps == 0) return PERMISSION_DENIED;
    677     return aps->getStreamVolumeIndex(stream, index);
    678 }
    679 
    680 uint32_t AudioSystem::getStrategyForStream(audio_stream_type_t stream)
    681 {
    682     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    683     if (aps == 0) return 0;
    684     return aps->getStrategyForStream(stream);
    685 }
    686 
    687 uint32_t AudioSystem::getDevicesForStream(audio_stream_type_t stream)
    688 {
    689     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    690     if (aps == 0) return 0;
    691     return aps->getDevicesForStream(stream);
    692 }
    693 
    694 audio_io_handle_t AudioSystem::getOutputForEffect(effect_descriptor_t *desc)
    695 {
    696     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    697     if (aps == 0) return PERMISSION_DENIED;
    698     return aps->getOutputForEffect(desc);
    699 }
    700 
    701 status_t AudioSystem::registerEffect(effect_descriptor_t *desc,
    702                                 audio_io_handle_t io,
    703                                 uint32_t strategy,
    704                                 int session,
    705                                 int id)
    706 {
    707     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    708     if (aps == 0) return PERMISSION_DENIED;
    709     return aps->registerEffect(desc, io, strategy, session, id);
    710 }
    711 
    712 status_t AudioSystem::unregisterEffect(int id)
    713 {
    714     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    715     if (aps == 0) return PERMISSION_DENIED;
    716     return aps->unregisterEffect(id);
    717 }
    718 
    719 status_t AudioSystem::setEffectEnabled(int id, bool enabled)
    720 {
    721     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    722     if (aps == 0) return PERMISSION_DENIED;
    723     return aps->setEffectEnabled(id, enabled);
    724 }
    725 
    726 status_t AudioSystem::isStreamActive(int stream, bool* state, uint32_t inPastMs)
    727 {
    728     const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
    729     if (aps == 0) return PERMISSION_DENIED;
    730     if (state == NULL) return BAD_VALUE;
    731     *state = aps->isStreamActive(stream, inPastMs);
    732     return NO_ERROR;
    733 }
    734 
    735 
    736 void AudioSystem::clearAudioConfigCache()
    737 {
    738     Mutex::Autolock _l(gLock);
    739     LOGV("clearAudioConfigCache()");
    740     gStreamOutputMap.clear();
    741     gOutputs.clear();
    742 }
    743 
    744 // ---------------------------------------------------------------------------
    745 
    746 void AudioSystem::AudioPolicyServiceClient::binderDied(const wp<IBinder>& who) {
    747     Mutex::Autolock _l(AudioSystem::gLock);
    748     AudioSystem::gAudioPolicyService.clear();
    749 
    750     LOGW("AudioPolicyService server died!");
    751 }
    752 
    753 }; // namespace android
    754 
    755