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/IAudioFlinger.h>
24#include <media/IAudioPolicyService.h>
25#include <math.h>
26
27#include <system/audio.h>
28
29// ----------------------------------------------------------------------------
30
31namespace android {
32
33// client singleton for AudioFlinger binder interface
34Mutex AudioSystem::gLock;
35Mutex AudioSystem::gLockAPS;
36sp<IAudioFlinger> AudioSystem::gAudioFlinger;
37sp<AudioSystem::AudioFlingerClient> AudioSystem::gAudioFlingerClient;
38audio_error_callback AudioSystem::gAudioErrorCallback = NULL;
39dynamic_policy_callback AudioSystem::gDynPolicyCallback = NULL;
40
41
42// establish binder interface to AudioFlinger service
43const sp<IAudioFlinger> AudioSystem::get_audio_flinger()
44{
45    sp<IAudioFlinger> af;
46    sp<AudioFlingerClient> afc;
47    {
48        Mutex::Autolock _l(gLock);
49        if (gAudioFlinger == 0) {
50            sp<IServiceManager> sm = defaultServiceManager();
51            sp<IBinder> binder;
52            do {
53                binder = sm->getService(String16("media.audio_flinger"));
54                if (binder != 0)
55                    break;
56                ALOGW("AudioFlinger not published, waiting...");
57                usleep(500000); // 0.5 s
58            } while (true);
59            if (gAudioFlingerClient == NULL) {
60                gAudioFlingerClient = new AudioFlingerClient();
61            } else {
62                if (gAudioErrorCallback) {
63                    gAudioErrorCallback(NO_ERROR);
64                }
65            }
66            binder->linkToDeath(gAudioFlingerClient);
67            gAudioFlinger = interface_cast<IAudioFlinger>(binder);
68            LOG_ALWAYS_FATAL_IF(gAudioFlinger == 0);
69            afc = gAudioFlingerClient;
70        }
71        af = gAudioFlinger;
72    }
73    if (afc != 0) {
74        af->registerClient(afc);
75    }
76    return af;
77}
78
79const sp<AudioSystem::AudioFlingerClient> AudioSystem::getAudioFlingerClient()
80{
81    // calling get_audio_flinger() will initialize gAudioFlingerClient if needed
82    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
83    if (af == 0) return 0;
84    Mutex::Autolock _l(gLock);
85    return gAudioFlingerClient;
86}
87
88sp<AudioIoDescriptor> AudioSystem::getIoDescriptor(audio_io_handle_t ioHandle)
89{
90    sp<AudioIoDescriptor> desc;
91    const sp<AudioFlingerClient> afc = getAudioFlingerClient();
92    if (afc != 0) {
93        desc = afc->getIoDescriptor(ioHandle);
94    }
95    return desc;
96}
97
98/* static */ status_t AudioSystem::checkAudioFlinger()
99{
100    if (defaultServiceManager()->checkService(String16("media.audio_flinger")) != 0) {
101        return NO_ERROR;
102    }
103    return DEAD_OBJECT;
104}
105
106status_t AudioSystem::muteMicrophone(bool state)
107{
108    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
109    if (af == 0) return PERMISSION_DENIED;
110    return af->setMicMute(state);
111}
112
113status_t AudioSystem::isMicrophoneMuted(bool* state)
114{
115    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
116    if (af == 0) return PERMISSION_DENIED;
117    *state = af->getMicMute();
118    return NO_ERROR;
119}
120
121status_t AudioSystem::setMasterVolume(float value)
122{
123    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
124    if (af == 0) return PERMISSION_DENIED;
125    af->setMasterVolume(value);
126    return NO_ERROR;
127}
128
129status_t AudioSystem::setMasterMute(bool mute)
130{
131    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
132    if (af == 0) return PERMISSION_DENIED;
133    af->setMasterMute(mute);
134    return NO_ERROR;
135}
136
137status_t AudioSystem::getMasterVolume(float* volume)
138{
139    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
140    if (af == 0) return PERMISSION_DENIED;
141    *volume = af->masterVolume();
142    return NO_ERROR;
143}
144
145status_t AudioSystem::getMasterMute(bool* mute)
146{
147    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
148    if (af == 0) return PERMISSION_DENIED;
149    *mute = af->masterMute();
150    return NO_ERROR;
151}
152
153status_t AudioSystem::setStreamVolume(audio_stream_type_t stream, float value,
154        audio_io_handle_t output)
155{
156    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
157    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
158    if (af == 0) return PERMISSION_DENIED;
159    af->setStreamVolume(stream, value, output);
160    return NO_ERROR;
161}
162
163status_t AudioSystem::setStreamMute(audio_stream_type_t stream, bool mute)
164{
165    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
166    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
167    if (af == 0) return PERMISSION_DENIED;
168    af->setStreamMute(stream, mute);
169    return NO_ERROR;
170}
171
172status_t AudioSystem::getStreamVolume(audio_stream_type_t stream, float* volume,
173        audio_io_handle_t output)
174{
175    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
176    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
177    if (af == 0) return PERMISSION_DENIED;
178    *volume = af->streamVolume(stream, output);
179    return NO_ERROR;
180}
181
182status_t AudioSystem::getStreamMute(audio_stream_type_t stream, bool* mute)
183{
184    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
185    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
186    if (af == 0) return PERMISSION_DENIED;
187    *mute = af->streamMute(stream);
188    return NO_ERROR;
189}
190
191status_t AudioSystem::setMode(audio_mode_t mode)
192{
193    if (uint32_t(mode) >= AUDIO_MODE_CNT) return BAD_VALUE;
194    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
195    if (af == 0) return PERMISSION_DENIED;
196    return af->setMode(mode);
197}
198
199status_t AudioSystem::setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs)
200{
201    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
202    if (af == 0) return PERMISSION_DENIED;
203    return af->setParameters(ioHandle, keyValuePairs);
204}
205
206String8 AudioSystem::getParameters(audio_io_handle_t ioHandle, const String8& keys)
207{
208    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
209    String8 result = String8("");
210    if (af == 0) return result;
211
212    result = af->getParameters(ioHandle, keys);
213    return result;
214}
215
216status_t AudioSystem::setParameters(const String8& keyValuePairs)
217{
218    return setParameters(AUDIO_IO_HANDLE_NONE, keyValuePairs);
219}
220
221String8 AudioSystem::getParameters(const String8& keys)
222{
223    return getParameters(AUDIO_IO_HANDLE_NONE, keys);
224}
225
226// convert volume steps to natural log scale
227
228// change this value to change volume scaling
229static const float dBPerStep = 0.5f;
230// shouldn't need to touch these
231static const float dBConvert = -dBPerStep * 2.302585093f / 20.0f;
232static const float dBConvertInverse = 1.0f / dBConvert;
233
234float AudioSystem::linearToLog(int volume)
235{
236    // float v = volume ? exp(float(100 - volume) * dBConvert) : 0;
237    // ALOGD("linearToLog(%d)=%f", volume, v);
238    // return v;
239    return volume ? exp(float(100 - volume) * dBConvert) : 0;
240}
241
242int AudioSystem::logToLinear(float volume)
243{
244    // int v = volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
245    // ALOGD("logTolinear(%d)=%f", v, volume);
246    // return v;
247    return volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
248}
249
250status_t AudioSystem::getOutputSamplingRate(uint32_t* samplingRate, audio_stream_type_t streamType)
251{
252    audio_io_handle_t output;
253
254    if (streamType == AUDIO_STREAM_DEFAULT) {
255        streamType = AUDIO_STREAM_MUSIC;
256    }
257
258    output = getOutput(streamType);
259    if (output == 0) {
260        return PERMISSION_DENIED;
261    }
262
263    return getSamplingRate(output, samplingRate);
264}
265
266status_t AudioSystem::getSamplingRate(audio_io_handle_t output,
267                                      uint32_t* samplingRate)
268{
269    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
270    if (af == 0) return PERMISSION_DENIED;
271    sp<AudioIoDescriptor> outputDesc = getIoDescriptor(output);
272    if (outputDesc == 0) {
273        ALOGV("getOutputSamplingRate() no output descriptor for output %d in gOutputs", output);
274        *samplingRate = af->sampleRate(output);
275    } else {
276        ALOGV("getOutputSamplingRate() reading from output desc");
277        *samplingRate = outputDesc->mSamplingRate;
278    }
279    if (*samplingRate == 0) {
280        ALOGE("AudioSystem::getSamplingRate failed for output %d", output);
281        return BAD_VALUE;
282    }
283
284    ALOGV("getSamplingRate() output %d, sampling rate %u", output, *samplingRate);
285
286    return NO_ERROR;
287}
288
289status_t AudioSystem::getOutputFrameCount(size_t* frameCount, audio_stream_type_t streamType)
290{
291    audio_io_handle_t output;
292
293    if (streamType == AUDIO_STREAM_DEFAULT) {
294        streamType = AUDIO_STREAM_MUSIC;
295    }
296
297    output = getOutput(streamType);
298    if (output == AUDIO_IO_HANDLE_NONE) {
299        return PERMISSION_DENIED;
300    }
301
302    return getFrameCount(output, frameCount);
303}
304
305status_t AudioSystem::getFrameCount(audio_io_handle_t output,
306                                    size_t* frameCount)
307{
308    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
309    if (af == 0) return PERMISSION_DENIED;
310    sp<AudioIoDescriptor> outputDesc = getIoDescriptor(output);
311    if (outputDesc == 0) {
312        *frameCount = af->frameCount(output);
313    } else {
314        *frameCount = outputDesc->mFrameCount;
315    }
316    if (*frameCount == 0) {
317        ALOGE("AudioSystem::getFrameCount failed for output %d", output);
318        return BAD_VALUE;
319    }
320
321    ALOGV("getFrameCount() output %d, frameCount %zu", output, *frameCount);
322
323    return NO_ERROR;
324}
325
326status_t AudioSystem::getOutputLatency(uint32_t* latency, audio_stream_type_t streamType)
327{
328    audio_io_handle_t output;
329
330    if (streamType == AUDIO_STREAM_DEFAULT) {
331        streamType = AUDIO_STREAM_MUSIC;
332    }
333
334    output = getOutput(streamType);
335    if (output == AUDIO_IO_HANDLE_NONE) {
336        return PERMISSION_DENIED;
337    }
338
339    return getLatency(output, latency);
340}
341
342status_t AudioSystem::getLatency(audio_io_handle_t output,
343                                 uint32_t* latency)
344{
345    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
346    if (af == 0) return PERMISSION_DENIED;
347    sp<AudioIoDescriptor> outputDesc = getIoDescriptor(output);
348    if (outputDesc == 0) {
349        *latency = af->latency(output);
350    } else {
351        *latency = outputDesc->mLatency;
352    }
353
354    ALOGV("getLatency() output %d, latency %d", output, *latency);
355
356    return NO_ERROR;
357}
358
359status_t AudioSystem::getInputBufferSize(uint32_t sampleRate, audio_format_t format,
360        audio_channel_mask_t channelMask, size_t* buffSize)
361{
362    const sp<AudioFlingerClient> afc = getAudioFlingerClient();
363    if (afc == 0) {
364        return NO_INIT;
365    }
366    return afc->getInputBufferSize(sampleRate, format, channelMask, buffSize);
367}
368
369status_t AudioSystem::setVoiceVolume(float value)
370{
371    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
372    if (af == 0) return PERMISSION_DENIED;
373    return af->setVoiceVolume(value);
374}
375
376status_t AudioSystem::getRenderPosition(audio_io_handle_t output, uint32_t *halFrames,
377                                        uint32_t *dspFrames)
378{
379    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
380    if (af == 0) return PERMISSION_DENIED;
381
382    return af->getRenderPosition(halFrames, dspFrames, output);
383}
384
385uint32_t AudioSystem::getInputFramesLost(audio_io_handle_t ioHandle)
386{
387    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
388    uint32_t result = 0;
389    if (af == 0) return result;
390    if (ioHandle == AUDIO_IO_HANDLE_NONE) return result;
391
392    result = af->getInputFramesLost(ioHandle);
393    return result;
394}
395
396audio_unique_id_t AudioSystem::newAudioUniqueId()
397{
398    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
399    if (af == 0) return AUDIO_UNIQUE_ID_ALLOCATE;
400    return af->newAudioUniqueId();
401}
402
403void AudioSystem::acquireAudioSessionId(int audioSession, pid_t pid)
404{
405    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
406    if (af != 0) {
407        af->acquireAudioSessionId(audioSession, pid);
408    }
409}
410
411void AudioSystem::releaseAudioSessionId(int audioSession, pid_t pid)
412{
413    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
414    if (af != 0) {
415        af->releaseAudioSessionId(audioSession, pid);
416    }
417}
418
419audio_hw_sync_t AudioSystem::getAudioHwSyncForSession(audio_session_t sessionId)
420{
421    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
422    if (af == 0) return AUDIO_HW_SYNC_INVALID;
423    return af->getAudioHwSyncForSession(sessionId);
424}
425
426status_t AudioSystem::systemReady()
427{
428    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
429    if (af == 0) return NO_INIT;
430    return af->systemReady();
431}
432
433// ---------------------------------------------------------------------------
434
435
436void AudioSystem::AudioFlingerClient::clearIoCache()
437{
438    Mutex::Autolock _l(mLock);
439    mIoDescriptors.clear();
440    mInBuffSize = 0;
441    mInSamplingRate = 0;
442    mInFormat = AUDIO_FORMAT_DEFAULT;
443    mInChannelMask = AUDIO_CHANNEL_NONE;
444}
445
446void AudioSystem::AudioFlingerClient::binderDied(const wp<IBinder>& who __unused)
447{
448    audio_error_callback cb = NULL;
449    {
450        Mutex::Autolock _l(AudioSystem::gLock);
451        AudioSystem::gAudioFlinger.clear();
452        cb = gAudioErrorCallback;
453    }
454
455    // clear output handles and stream to output map caches
456    clearIoCache();
457
458    if (cb) {
459        cb(DEAD_OBJECT);
460    }
461    ALOGW("AudioFlinger server died!");
462}
463
464void AudioSystem::AudioFlingerClient::ioConfigChanged(audio_io_config_event event,
465                                                      const sp<AudioIoDescriptor>& ioDesc) {
466    ALOGV("ioConfigChanged() event %d", event);
467
468    if (ioDesc == 0 || ioDesc->mIoHandle == AUDIO_IO_HANDLE_NONE) return;
469
470    audio_port_handle_t deviceId = AUDIO_PORT_HANDLE_NONE;
471    Vector < sp<AudioDeviceCallback> > callbacks;
472
473    {
474        Mutex::Autolock _l(mLock);
475
476        switch (event) {
477        case AUDIO_OUTPUT_OPENED:
478        case AUDIO_INPUT_OPENED: {
479            sp<AudioIoDescriptor> oldDesc = getIoDescriptor_l(ioDesc->mIoHandle);
480            if (oldDesc == 0) {
481                mIoDescriptors.add(ioDesc->mIoHandle, ioDesc);
482            } else {
483                deviceId = oldDesc->getDeviceId();
484                mIoDescriptors.replaceValueFor(ioDesc->mIoHandle, ioDesc);
485            }
486
487            if (ioDesc->getDeviceId() != AUDIO_PORT_HANDLE_NONE) {
488                deviceId = ioDesc->getDeviceId();
489                ssize_t ioIndex = mAudioDeviceCallbacks.indexOfKey(ioDesc->mIoHandle);
490                if (ioIndex >= 0) {
491                    callbacks = mAudioDeviceCallbacks.valueAt(ioIndex);
492                }
493            }
494            ALOGV("ioConfigChanged() new %s opened %d samplingRate %u, format %#x channel mask %#x "
495                    "frameCount %zu deviceId %d", event == AUDIO_OUTPUT_OPENED ? "output" : "input",
496                    ioDesc->mIoHandle, ioDesc->mSamplingRate, ioDesc->mFormat, ioDesc->mChannelMask,
497                    ioDesc->mFrameCount, ioDesc->getDeviceId());
498            } break;
499        case AUDIO_OUTPUT_CLOSED:
500        case AUDIO_INPUT_CLOSED: {
501            if (getIoDescriptor_l(ioDesc->mIoHandle) == 0) {
502                ALOGW("ioConfigChanged() closing unknown %s %d",
503                      event == AUDIO_OUTPUT_CLOSED ? "output" : "input", ioDesc->mIoHandle);
504                break;
505            }
506            ALOGV("ioConfigChanged() %s %d closed",
507                  event == AUDIO_OUTPUT_CLOSED ? "output" : "input", ioDesc->mIoHandle);
508
509            mIoDescriptors.removeItem(ioDesc->mIoHandle);
510            mAudioDeviceCallbacks.removeItem(ioDesc->mIoHandle);
511            } break;
512
513        case AUDIO_OUTPUT_CONFIG_CHANGED:
514        case AUDIO_INPUT_CONFIG_CHANGED: {
515            sp<AudioIoDescriptor> oldDesc = getIoDescriptor_l(ioDesc->mIoHandle);
516            if (oldDesc == 0) {
517                ALOGW("ioConfigChanged() modifying unknown output! %d", ioDesc->mIoHandle);
518                break;
519            }
520
521            deviceId = oldDesc->getDeviceId();
522            mIoDescriptors.replaceValueFor(ioDesc->mIoHandle, ioDesc);
523
524            if (deviceId != ioDesc->getDeviceId()) {
525                deviceId = ioDesc->getDeviceId();
526                ssize_t ioIndex = mAudioDeviceCallbacks.indexOfKey(ioDesc->mIoHandle);
527                if (ioIndex >= 0) {
528                    callbacks = mAudioDeviceCallbacks.valueAt(ioIndex);
529                }
530            }
531            ALOGV("ioConfigChanged() new config for %s %d samplingRate %u, format %#x "
532                    "channel mask %#x frameCount %zu deviceId %d",
533                    event == AUDIO_OUTPUT_CONFIG_CHANGED ? "output" : "input",
534                    ioDesc->mIoHandle, ioDesc->mSamplingRate, ioDesc->mFormat,
535                    ioDesc->mChannelMask, ioDesc->mFrameCount, ioDesc->getDeviceId());
536
537        } break;
538        }
539    }
540    // callbacks.size() != 0 =>  ioDesc->mIoHandle and deviceId are valid
541    for (size_t i = 0; i < callbacks.size(); i++) {
542        callbacks[i]->onAudioDeviceUpdate(ioDesc->mIoHandle, deviceId);
543    }
544}
545
546status_t AudioSystem::AudioFlingerClient::getInputBufferSize(
547                                                uint32_t sampleRate, audio_format_t format,
548                                                audio_channel_mask_t channelMask, size_t* buffSize)
549{
550    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
551    if (af == 0) {
552        return PERMISSION_DENIED;
553    }
554    Mutex::Autolock _l(mLock);
555    // Do we have a stale mInBuffSize or are we requesting the input buffer size for new values
556    if ((mInBuffSize == 0) || (sampleRate != mInSamplingRate) || (format != mInFormat)
557        || (channelMask != mInChannelMask)) {
558        size_t inBuffSize = af->getInputBufferSize(sampleRate, format, channelMask);
559        if (inBuffSize == 0) {
560            ALOGE("AudioSystem::getInputBufferSize failed sampleRate %d format %#x channelMask %x",
561                    sampleRate, format, channelMask);
562            return BAD_VALUE;
563        }
564        // A benign race is possible here: we could overwrite a fresher cache entry
565        // save the request params
566        mInSamplingRate = sampleRate;
567        mInFormat = format;
568        mInChannelMask = channelMask;
569
570        mInBuffSize = inBuffSize;
571    }
572
573    *buffSize = mInBuffSize;
574
575    return NO_ERROR;
576}
577
578sp<AudioIoDescriptor> AudioSystem::AudioFlingerClient::getIoDescriptor_l(audio_io_handle_t ioHandle)
579{
580    sp<AudioIoDescriptor> desc;
581    ssize_t index = mIoDescriptors.indexOfKey(ioHandle);
582    if (index >= 0) {
583        desc = mIoDescriptors.valueAt(index);
584    }
585    return desc;
586}
587
588sp<AudioIoDescriptor> AudioSystem::AudioFlingerClient::getIoDescriptor(audio_io_handle_t ioHandle)
589{
590    Mutex::Autolock _l(mLock);
591    return getIoDescriptor_l(ioHandle);
592}
593
594status_t AudioSystem::AudioFlingerClient::addAudioDeviceCallback(
595        const sp<AudioDeviceCallback>& callback, audio_io_handle_t audioIo)
596{
597    Mutex::Autolock _l(mLock);
598    Vector < sp<AudioDeviceCallback> > callbacks;
599    ssize_t ioIndex = mAudioDeviceCallbacks.indexOfKey(audioIo);
600    if (ioIndex >= 0) {
601        callbacks = mAudioDeviceCallbacks.valueAt(ioIndex);
602    }
603
604    for (size_t cbIndex = 0; cbIndex < callbacks.size(); cbIndex++) {
605        if (callbacks[cbIndex] == callback) {
606            return INVALID_OPERATION;
607        }
608    }
609    callbacks.add(callback);
610
611    mAudioDeviceCallbacks.replaceValueFor(audioIo, callbacks);
612    return NO_ERROR;
613}
614
615status_t AudioSystem::AudioFlingerClient::removeAudioDeviceCallback(
616        const sp<AudioDeviceCallback>& callback, audio_io_handle_t audioIo)
617{
618    Mutex::Autolock _l(mLock);
619    ssize_t ioIndex = mAudioDeviceCallbacks.indexOfKey(audioIo);
620    if (ioIndex < 0) {
621        return INVALID_OPERATION;
622    }
623    Vector < sp<AudioDeviceCallback> > callbacks = mAudioDeviceCallbacks.valueAt(ioIndex);
624
625    size_t cbIndex;
626    for (cbIndex = 0; cbIndex < callbacks.size(); cbIndex++) {
627        if (callbacks[cbIndex] == callback) {
628            break;
629        }
630    }
631    if (cbIndex == callbacks.size()) {
632        return INVALID_OPERATION;
633    }
634    callbacks.removeAt(cbIndex);
635    if (callbacks.size() != 0) {
636        mAudioDeviceCallbacks.replaceValueFor(audioIo, callbacks);
637    } else {
638        mAudioDeviceCallbacks.removeItem(audioIo);
639    }
640    return NO_ERROR;
641}
642
643/* static */ void AudioSystem::setErrorCallback(audio_error_callback cb)
644{
645    Mutex::Autolock _l(gLock);
646    gAudioErrorCallback = cb;
647}
648
649/*static*/ void AudioSystem::setDynPolicyCallback(dynamic_policy_callback cb)
650{
651    Mutex::Autolock _l(gLock);
652    gDynPolicyCallback = cb;
653}
654
655// client singleton for AudioPolicyService binder interface
656// protected by gLockAPS
657sp<IAudioPolicyService> AudioSystem::gAudioPolicyService;
658sp<AudioSystem::AudioPolicyServiceClient> AudioSystem::gAudioPolicyServiceClient;
659
660
661// establish binder interface to AudioPolicy service
662const sp<IAudioPolicyService> AudioSystem::get_audio_policy_service()
663{
664    sp<IAudioPolicyService> ap;
665    sp<AudioPolicyServiceClient> apc;
666    {
667        Mutex::Autolock _l(gLockAPS);
668        if (gAudioPolicyService == 0) {
669            sp<IServiceManager> sm = defaultServiceManager();
670            sp<IBinder> binder;
671            do {
672                binder = sm->getService(String16("media.audio_policy"));
673                if (binder != 0)
674                    break;
675                ALOGW("AudioPolicyService not published, waiting...");
676                usleep(500000); // 0.5 s
677            } while (true);
678            if (gAudioPolicyServiceClient == NULL) {
679                gAudioPolicyServiceClient = new AudioPolicyServiceClient();
680            }
681            binder->linkToDeath(gAudioPolicyServiceClient);
682            gAudioPolicyService = interface_cast<IAudioPolicyService>(binder);
683            LOG_ALWAYS_FATAL_IF(gAudioPolicyService == 0);
684            apc = gAudioPolicyServiceClient;
685        }
686        ap = gAudioPolicyService;
687    }
688    if (apc != 0) {
689        ap->registerClient(apc);
690    }
691
692    return ap;
693}
694
695// ---------------------------------------------------------------------------
696
697status_t AudioSystem::setDeviceConnectionState(audio_devices_t device,
698                                               audio_policy_dev_state_t state,
699                                               const char *device_address,
700                                               const char *device_name)
701{
702    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
703    const char *address = "";
704    const char *name = "";
705
706    if (aps == 0) return PERMISSION_DENIED;
707
708    if (device_address != NULL) {
709        address = device_address;
710    }
711    if (device_name != NULL) {
712        name = device_name;
713    }
714    return aps->setDeviceConnectionState(device, state, address, name);
715}
716
717audio_policy_dev_state_t AudioSystem::getDeviceConnectionState(audio_devices_t device,
718                                                  const char *device_address)
719{
720    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
721    if (aps == 0) return AUDIO_POLICY_DEVICE_STATE_UNAVAILABLE;
722
723    return aps->getDeviceConnectionState(device, device_address);
724}
725
726status_t AudioSystem::setPhoneState(audio_mode_t state)
727{
728    if (uint32_t(state) >= AUDIO_MODE_CNT) return BAD_VALUE;
729    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
730    if (aps == 0) return PERMISSION_DENIED;
731
732    return aps->setPhoneState(state);
733}
734
735status_t AudioSystem::setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config)
736{
737    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
738    if (aps == 0) return PERMISSION_DENIED;
739    return aps->setForceUse(usage, config);
740}
741
742audio_policy_forced_cfg_t AudioSystem::getForceUse(audio_policy_force_use_t usage)
743{
744    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
745    if (aps == 0) return AUDIO_POLICY_FORCE_NONE;
746    return aps->getForceUse(usage);
747}
748
749
750audio_io_handle_t AudioSystem::getOutput(audio_stream_type_t stream,
751                                    uint32_t samplingRate,
752                                    audio_format_t format,
753                                    audio_channel_mask_t channelMask,
754                                    audio_output_flags_t flags,
755                                    const audio_offload_info_t *offloadInfo)
756{
757    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
758    if (aps == 0) return 0;
759    return aps->getOutput(stream, samplingRate, format, channelMask, flags, offloadInfo);
760}
761
762status_t AudioSystem::getOutputForAttr(const audio_attributes_t *attr,
763                                        audio_io_handle_t *output,
764                                        audio_session_t session,
765                                        audio_stream_type_t *stream,
766                                        uid_t uid,
767                                        uint32_t samplingRate,
768                                        audio_format_t format,
769                                        audio_channel_mask_t channelMask,
770                                        audio_output_flags_t flags,
771                                        audio_port_handle_t selectedDeviceId,
772                                        const audio_offload_info_t *offloadInfo)
773{
774    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
775    if (aps == 0) return NO_INIT;
776    return aps->getOutputForAttr(attr, output, session, stream, uid,
777                                 samplingRate, format, channelMask,
778                                 flags, selectedDeviceId, offloadInfo);
779}
780
781status_t AudioSystem::startOutput(audio_io_handle_t output,
782                                  audio_stream_type_t stream,
783                                  audio_session_t session)
784{
785    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
786    if (aps == 0) return PERMISSION_DENIED;
787    return aps->startOutput(output, stream, session);
788}
789
790status_t AudioSystem::stopOutput(audio_io_handle_t output,
791                                 audio_stream_type_t stream,
792                                 audio_session_t session)
793{
794    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
795    if (aps == 0) return PERMISSION_DENIED;
796    return aps->stopOutput(output, stream, session);
797}
798
799void AudioSystem::releaseOutput(audio_io_handle_t output,
800                                audio_stream_type_t stream,
801                                audio_session_t session)
802{
803    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
804    if (aps == 0) return;
805    aps->releaseOutput(output, stream, session);
806}
807
808status_t AudioSystem::getInputForAttr(const audio_attributes_t *attr,
809                                audio_io_handle_t *input,
810                                audio_session_t session,
811                                uid_t uid,
812                                uint32_t samplingRate,
813                                audio_format_t format,
814                                audio_channel_mask_t channelMask,
815                                audio_input_flags_t flags,
816                                audio_port_handle_t selectedDeviceId)
817{
818    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
819    if (aps == 0) return NO_INIT;
820    return aps->getInputForAttr(
821            attr, input, session, uid, samplingRate, format, channelMask, flags, selectedDeviceId);
822}
823
824status_t AudioSystem::startInput(audio_io_handle_t input,
825                                 audio_session_t session)
826{
827    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
828    if (aps == 0) return PERMISSION_DENIED;
829    return aps->startInput(input, session);
830}
831
832status_t AudioSystem::stopInput(audio_io_handle_t input,
833                                audio_session_t session)
834{
835    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
836    if (aps == 0) return PERMISSION_DENIED;
837    return aps->stopInput(input, session);
838}
839
840void AudioSystem::releaseInput(audio_io_handle_t input,
841                               audio_session_t session)
842{
843    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
844    if (aps == 0) return;
845    aps->releaseInput(input, session);
846}
847
848status_t AudioSystem::initStreamVolume(audio_stream_type_t stream,
849                                    int indexMin,
850                                    int indexMax)
851{
852    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
853    if (aps == 0) return PERMISSION_DENIED;
854    return aps->initStreamVolume(stream, indexMin, indexMax);
855}
856
857status_t AudioSystem::setStreamVolumeIndex(audio_stream_type_t stream,
858                                           int index,
859                                           audio_devices_t device)
860{
861    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
862    if (aps == 0) return PERMISSION_DENIED;
863    return aps->setStreamVolumeIndex(stream, index, device);
864}
865
866status_t AudioSystem::getStreamVolumeIndex(audio_stream_type_t stream,
867                                           int *index,
868                                           audio_devices_t device)
869{
870    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
871    if (aps == 0) return PERMISSION_DENIED;
872    return aps->getStreamVolumeIndex(stream, index, device);
873}
874
875uint32_t AudioSystem::getStrategyForStream(audio_stream_type_t stream)
876{
877    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
878    if (aps == 0) return 0;
879    return aps->getStrategyForStream(stream);
880}
881
882audio_devices_t AudioSystem::getDevicesForStream(audio_stream_type_t stream)
883{
884    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
885    if (aps == 0) return AUDIO_DEVICE_NONE;
886    return aps->getDevicesForStream(stream);
887}
888
889audio_io_handle_t AudioSystem::getOutputForEffect(const effect_descriptor_t *desc)
890{
891    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
892    // FIXME change return type to status_t, and return PERMISSION_DENIED here
893    if (aps == 0) return AUDIO_IO_HANDLE_NONE;
894    return aps->getOutputForEffect(desc);
895}
896
897status_t AudioSystem::registerEffect(const effect_descriptor_t *desc,
898                                audio_io_handle_t io,
899                                uint32_t strategy,
900                                int session,
901                                int id)
902{
903    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
904    if (aps == 0) return PERMISSION_DENIED;
905    return aps->registerEffect(desc, io, strategy, session, id);
906}
907
908status_t AudioSystem::unregisterEffect(int id)
909{
910    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
911    if (aps == 0) return PERMISSION_DENIED;
912    return aps->unregisterEffect(id);
913}
914
915status_t AudioSystem::setEffectEnabled(int id, bool enabled)
916{
917    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
918    if (aps == 0) return PERMISSION_DENIED;
919    return aps->setEffectEnabled(id, enabled);
920}
921
922status_t AudioSystem::isStreamActive(audio_stream_type_t stream, bool* state, uint32_t inPastMs)
923{
924    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
925    if (aps == 0) return PERMISSION_DENIED;
926    if (state == NULL) return BAD_VALUE;
927    *state = aps->isStreamActive(stream, inPastMs);
928    return NO_ERROR;
929}
930
931status_t AudioSystem::isStreamActiveRemotely(audio_stream_type_t stream, bool* state,
932        uint32_t inPastMs)
933{
934    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
935    if (aps == 0) return PERMISSION_DENIED;
936    if (state == NULL) return BAD_VALUE;
937    *state = aps->isStreamActiveRemotely(stream, inPastMs);
938    return NO_ERROR;
939}
940
941status_t AudioSystem::isSourceActive(audio_source_t stream, bool* state)
942{
943    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
944    if (aps == 0) return PERMISSION_DENIED;
945    if (state == NULL) return BAD_VALUE;
946    *state = aps->isSourceActive(stream);
947    return NO_ERROR;
948}
949
950uint32_t AudioSystem::getPrimaryOutputSamplingRate()
951{
952    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
953    if (af == 0) return 0;
954    return af->getPrimaryOutputSamplingRate();
955}
956
957size_t AudioSystem::getPrimaryOutputFrameCount()
958{
959    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
960    if (af == 0) return 0;
961    return af->getPrimaryOutputFrameCount();
962}
963
964status_t AudioSystem::setLowRamDevice(bool isLowRamDevice)
965{
966    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
967    if (af == 0) return PERMISSION_DENIED;
968    return af->setLowRamDevice(isLowRamDevice);
969}
970
971void AudioSystem::clearAudioConfigCache()
972{
973    // called by restoreTrack_l(), which needs new IAudioFlinger and IAudioPolicyService instances
974    ALOGV("clearAudioConfigCache()");
975    {
976        Mutex::Autolock _l(gLock);
977        if (gAudioFlingerClient != 0) {
978            gAudioFlingerClient->clearIoCache();
979        }
980        gAudioFlinger.clear();
981    }
982    {
983        Mutex::Autolock _l(gLockAPS);
984        gAudioPolicyService.clear();
985    }
986}
987
988bool AudioSystem::isOffloadSupported(const audio_offload_info_t& info)
989{
990    ALOGV("isOffloadSupported()");
991    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
992    if (aps == 0) return false;
993    return aps->isOffloadSupported(info);
994}
995
996status_t AudioSystem::listAudioPorts(audio_port_role_t role,
997                                     audio_port_type_t type,
998                                     unsigned int *num_ports,
999                                     struct audio_port *ports,
1000                                     unsigned int *generation)
1001{
1002    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
1003    if (aps == 0) return PERMISSION_DENIED;
1004    return aps->listAudioPorts(role, type, num_ports, ports, generation);
1005}
1006
1007status_t AudioSystem::getAudioPort(struct audio_port *port)
1008{
1009    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
1010    if (aps == 0) return PERMISSION_DENIED;
1011    return aps->getAudioPort(port);
1012}
1013
1014status_t AudioSystem::createAudioPatch(const struct audio_patch *patch,
1015                                   audio_patch_handle_t *handle)
1016{
1017    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
1018    if (aps == 0) return PERMISSION_DENIED;
1019    return aps->createAudioPatch(patch, handle);
1020}
1021
1022status_t AudioSystem::releaseAudioPatch(audio_patch_handle_t handle)
1023{
1024    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
1025    if (aps == 0) return PERMISSION_DENIED;
1026    return aps->releaseAudioPatch(handle);
1027}
1028
1029status_t AudioSystem::listAudioPatches(unsigned int *num_patches,
1030                                  struct audio_patch *patches,
1031                                  unsigned int *generation)
1032{
1033    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
1034    if (aps == 0) return PERMISSION_DENIED;
1035    return aps->listAudioPatches(num_patches, patches, generation);
1036}
1037
1038status_t AudioSystem::setAudioPortConfig(const struct audio_port_config *config)
1039{
1040    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
1041    if (aps == 0) return PERMISSION_DENIED;
1042    return aps->setAudioPortConfig(config);
1043}
1044
1045status_t AudioSystem::addAudioPortCallback(const sp<AudioPortCallback>& callback)
1046{
1047    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
1048    if (aps == 0) return PERMISSION_DENIED;
1049
1050    Mutex::Autolock _l(gLockAPS);
1051    if (gAudioPolicyServiceClient == 0) {
1052        return NO_INIT;
1053    }
1054    int ret = gAudioPolicyServiceClient->addAudioPortCallback(callback);
1055    if (ret == 1) {
1056        aps->setAudioPortCallbacksEnabled(true);
1057    }
1058    return (ret < 0) ? INVALID_OPERATION : NO_ERROR;
1059}
1060
1061/*static*/
1062status_t AudioSystem::removeAudioPortCallback(const sp<AudioPortCallback>& callback)
1063{
1064    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
1065    if (aps == 0) return PERMISSION_DENIED;
1066
1067    Mutex::Autolock _l(gLockAPS);
1068    if (gAudioPolicyServiceClient == 0) {
1069        return NO_INIT;
1070    }
1071    int ret = gAudioPolicyServiceClient->removeAudioPortCallback(callback);
1072    if (ret == 0) {
1073        aps->setAudioPortCallbacksEnabled(false);
1074    }
1075    return (ret < 0) ? INVALID_OPERATION : NO_ERROR;
1076}
1077
1078status_t AudioSystem::addAudioDeviceCallback(
1079        const sp<AudioDeviceCallback>& callback, audio_io_handle_t audioIo)
1080{
1081    const sp<AudioFlingerClient> afc = getAudioFlingerClient();
1082    if (afc == 0) {
1083        return NO_INIT;
1084    }
1085    status_t status = afc->addAudioDeviceCallback(callback, audioIo);
1086    if (status == NO_ERROR) {
1087        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
1088        if (af != 0) {
1089            af->registerClient(afc);
1090        }
1091    }
1092    return status;
1093}
1094
1095status_t AudioSystem::removeAudioDeviceCallback(
1096        const sp<AudioDeviceCallback>& callback, audio_io_handle_t audioIo)
1097{
1098    const sp<AudioFlingerClient> afc = getAudioFlingerClient();
1099    if (afc == 0) {
1100        return NO_INIT;
1101    }
1102    return afc->removeAudioDeviceCallback(callback, audioIo);
1103}
1104
1105audio_port_handle_t AudioSystem::getDeviceIdForIo(audio_io_handle_t audioIo)
1106{
1107    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
1108    if (af == 0) return PERMISSION_DENIED;
1109    const sp<AudioIoDescriptor> desc = getIoDescriptor(audioIo);
1110    if (desc == 0) {
1111        return AUDIO_PORT_HANDLE_NONE;
1112    }
1113    return desc->getDeviceId();
1114}
1115
1116status_t AudioSystem::acquireSoundTriggerSession(audio_session_t *session,
1117                                       audio_io_handle_t *ioHandle,
1118                                       audio_devices_t *device)
1119{
1120    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
1121    if (aps == 0) return PERMISSION_DENIED;
1122    return aps->acquireSoundTriggerSession(session, ioHandle, device);
1123}
1124
1125status_t AudioSystem::releaseSoundTriggerSession(audio_session_t session)
1126{
1127    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
1128    if (aps == 0) return PERMISSION_DENIED;
1129    return aps->releaseSoundTriggerSession(session);
1130}
1131
1132audio_mode_t AudioSystem::getPhoneState()
1133{
1134    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
1135    if (aps == 0) return AUDIO_MODE_INVALID;
1136    return aps->getPhoneState();
1137}
1138
1139status_t AudioSystem::registerPolicyMixes(Vector<AudioMix> mixes, bool registration)
1140{
1141    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
1142    if (aps == 0) return PERMISSION_DENIED;
1143    return aps->registerPolicyMixes(mixes, registration);
1144}
1145
1146status_t AudioSystem::startAudioSource(const struct audio_port_config *source,
1147                                       const audio_attributes_t *attributes,
1148                                       audio_io_handle_t *handle)
1149{
1150    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
1151    if (aps == 0) return PERMISSION_DENIED;
1152    return aps->startAudioSource(source, attributes, handle);
1153}
1154
1155status_t AudioSystem::stopAudioSource(audio_io_handle_t handle)
1156{
1157    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
1158    if (aps == 0) return PERMISSION_DENIED;
1159    return aps->stopAudioSource(handle);
1160}
1161
1162// ---------------------------------------------------------------------------
1163
1164int AudioSystem::AudioPolicyServiceClient::addAudioPortCallback(
1165        const sp<AudioPortCallback>& callback)
1166{
1167    Mutex::Autolock _l(mLock);
1168    for (size_t i = 0; i < mAudioPortCallbacks.size(); i++) {
1169        if (mAudioPortCallbacks[i] == callback) {
1170            return -1;
1171        }
1172    }
1173    mAudioPortCallbacks.add(callback);
1174    return mAudioPortCallbacks.size();
1175}
1176
1177int AudioSystem::AudioPolicyServiceClient::removeAudioPortCallback(
1178        const sp<AudioPortCallback>& callback)
1179{
1180    Mutex::Autolock _l(mLock);
1181    size_t i;
1182    for (i = 0; i < mAudioPortCallbacks.size(); i++) {
1183        if (mAudioPortCallbacks[i] == callback) {
1184            break;
1185        }
1186    }
1187    if (i == mAudioPortCallbacks.size()) {
1188        return -1;
1189    }
1190    mAudioPortCallbacks.removeAt(i);
1191    return mAudioPortCallbacks.size();
1192}
1193
1194
1195void AudioSystem::AudioPolicyServiceClient::onAudioPortListUpdate()
1196{
1197    Mutex::Autolock _l(mLock);
1198    for (size_t i = 0; i < mAudioPortCallbacks.size(); i++) {
1199        mAudioPortCallbacks[i]->onAudioPortListUpdate();
1200    }
1201}
1202
1203void AudioSystem::AudioPolicyServiceClient::onAudioPatchListUpdate()
1204{
1205    Mutex::Autolock _l(mLock);
1206    for (size_t i = 0; i < mAudioPortCallbacks.size(); i++) {
1207        mAudioPortCallbacks[i]->onAudioPatchListUpdate();
1208    }
1209}
1210
1211void AudioSystem::AudioPolicyServiceClient::onDynamicPolicyMixStateUpdate(
1212        String8 regId, int32_t state)
1213{
1214    ALOGV("AudioPolicyServiceClient::onDynamicPolicyMixStateUpdate(%s, %d)", regId.string(), state);
1215    dynamic_policy_callback cb = NULL;
1216    {
1217        Mutex::Autolock _l(AudioSystem::gLock);
1218        cb = gDynPolicyCallback;
1219    }
1220
1221    if (cb != NULL) {
1222        cb(DYNAMIC_POLICY_EVENT_MIX_STATE_UPDATE, regId, state);
1223    }
1224}
1225
1226void AudioSystem::AudioPolicyServiceClient::binderDied(const wp<IBinder>& who __unused)
1227{
1228    {
1229        Mutex::Autolock _l(mLock);
1230        for (size_t i = 0; i < mAudioPortCallbacks.size(); i++) {
1231            mAudioPortCallbacks[i]->onServiceDied();
1232        }
1233    }
1234    {
1235        Mutex::Autolock _l(gLockAPS);
1236        AudioSystem::gAudioPolicyService.clear();
1237    }
1238
1239    ALOGW("AudioPolicyService server died!");
1240}
1241
1242} // namespace android
1243