AudioSystem.cpp revision e33054eb968cbf8ccaee1b0ff0301403902deed6 
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
30namespace android {
31
32// client singleton for AudioFlinger binder interface
33Mutex AudioSystem::gLock;
34sp<IAudioFlinger> AudioSystem::gAudioFlinger;
35sp<AudioSystem::AudioFlingerClient> AudioSystem::gAudioFlingerClient;
36audio_error_callback AudioSystem::gAudioErrorCallback = NULL;
37// Cached values
38
39DefaultKeyedVector<audio_io_handle_t, AudioSystem::OutputDescriptor *> AudioSystem::gOutputs(0);
40
41// Cached values for recording queries, all protected by gLock
42uint32_t AudioSystem::gPrevInSamplingRate = 16000;
43audio_format_t AudioSystem::gPrevInFormat = AUDIO_FORMAT_PCM_16_BIT;
44audio_channel_mask_t AudioSystem::gPrevInChannelMask = AUDIO_CHANNEL_IN_MONO;
45size_t AudioSystem::gInBuffSize = 0;
46
47
48// establish binder interface to AudioFlinger service
49const sp<IAudioFlinger>& AudioSystem::get_audio_flinger()
50{
51    Mutex::Autolock _l(gLock);
52    if (gAudioFlinger == 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            ALOGW("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    ALOGE_IF(gAudioFlinger==0, "no AudioFlinger!?");
74
75    return gAudioFlinger;
76}
77
78status_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
84status_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
91status_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
99status_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
107status_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
115status_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
123status_t AudioSystem::setStreamVolume(audio_stream_type_t stream, float value,
124        audio_io_handle_t output)
125{
126    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
127    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
128    if (af == 0) return PERMISSION_DENIED;
129    af->setStreamVolume(stream, value, output);
130    return NO_ERROR;
131}
132
133status_t AudioSystem::setStreamMute(audio_stream_type_t stream, bool mute)
134{
135    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
136    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
137    if (af == 0) return PERMISSION_DENIED;
138    af->setStreamMute(stream, mute);
139    return NO_ERROR;
140}
141
142status_t AudioSystem::getStreamVolume(audio_stream_type_t stream, float* volume,
143        audio_io_handle_t output)
144{
145    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
146    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
147    if (af == 0) return PERMISSION_DENIED;
148    *volume = af->streamVolume(stream, output);
149    return NO_ERROR;
150}
151
152status_t AudioSystem::getStreamMute(audio_stream_type_t stream, bool* mute)
153{
154    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
155    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
156    if (af == 0) return PERMISSION_DENIED;
157    *mute = af->streamMute(stream);
158    return NO_ERROR;
159}
160
161status_t AudioSystem::setMode(audio_mode_t mode)
162{
163    if (uint32_t(mode) >= AUDIO_MODE_CNT) return BAD_VALUE;
164    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
165    if (af == 0) return PERMISSION_DENIED;
166    return af->setMode(mode);
167}
168
169status_t AudioSystem::setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs) {
170    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
171    if (af == 0) return PERMISSION_DENIED;
172    return af->setParameters(ioHandle, keyValuePairs);
173}
174
175String8 AudioSystem::getParameters(audio_io_handle_t ioHandle, const String8& keys) {
176    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
177    String8 result = String8("");
178    if (af == 0) return result;
179
180    result = af->getParameters(ioHandle, keys);
181    return result;
182}
183
184// convert volume steps to natural log scale
185
186// change this value to change volume scaling
187static const float dBPerStep = 0.5f;
188// shouldn't need to touch these
189static const float dBConvert = -dBPerStep * 2.302585093f / 20.0f;
190static const float dBConvertInverse = 1.0f / dBConvert;
191
192float AudioSystem::linearToLog(int volume)
193{
194    // float v = volume ? exp(float(100 - volume) * dBConvert) : 0;
195    // ALOGD("linearToLog(%d)=%f", volume, v);
196    // return v;
197    return volume ? exp(float(100 - volume) * dBConvert) : 0;
198}
199
200int AudioSystem::logToLinear(float volume)
201{
202    // int v = volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
203    // ALOGD("logTolinear(%d)=%f", v, volume);
204    // return v;
205    return volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
206}
207
208status_t AudioSystem::getOutputSamplingRate(uint32_t* samplingRate, audio_stream_type_t streamType)
209{
210    audio_io_handle_t output;
211
212    if (streamType == AUDIO_STREAM_DEFAULT) {
213        streamType = AUDIO_STREAM_MUSIC;
214    }
215
216    output = getOutput(streamType);
217    if (output == 0) {
218        return PERMISSION_DENIED;
219    }
220
221    return getSamplingRate(output, streamType, samplingRate);
222}
223
224status_t AudioSystem::getSamplingRate(audio_io_handle_t output,
225                                      audio_stream_type_t streamType,
226                                      uint32_t* samplingRate)
227{
228    OutputDescriptor *outputDesc;
229
230    gLock.lock();
231    outputDesc = AudioSystem::gOutputs.valueFor(output);
232    if (outputDesc == NULL) {
233        ALOGV("getOutputSamplingRate() no output descriptor for output %d in gOutputs", output);
234        gLock.unlock();
235        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
236        if (af == 0) return PERMISSION_DENIED;
237        *samplingRate = af->sampleRate(output);
238    } else {
239        ALOGV("getOutputSamplingRate() reading from output desc");
240        *samplingRate = outputDesc->samplingRate;
241        gLock.unlock();
242    }
243
244    ALOGV("getSamplingRate() streamType %d, output %d, sampling rate %u", streamType, output,
245            *samplingRate);
246
247    return NO_ERROR;
248}
249
250status_t AudioSystem::getOutputFrameCount(size_t* frameCount, 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 getFrameCount(output, streamType, frameCount);
264}
265
266status_t AudioSystem::getFrameCount(audio_io_handle_t output,
267                                    audio_stream_type_t streamType,
268                                    size_t* frameCount)
269{
270    OutputDescriptor *outputDesc;
271
272    gLock.lock();
273    outputDesc = AudioSystem::gOutputs.valueFor(output);
274    if (outputDesc == NULL) {
275        gLock.unlock();
276        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
277        if (af == 0) return PERMISSION_DENIED;
278        *frameCount = af->frameCount(output);
279    } else {
280        *frameCount = outputDesc->frameCount;
281        gLock.unlock();
282    }
283
284    ALOGV("getFrameCount() streamType %d, output %d, frameCount %d", streamType, output,
285            *frameCount);
286
287    return NO_ERROR;
288}
289
290status_t AudioSystem::getOutputLatency(uint32_t* latency, audio_stream_type_t streamType)
291{
292    audio_io_handle_t output;
293
294    if (streamType == AUDIO_STREAM_DEFAULT) {
295        streamType = AUDIO_STREAM_MUSIC;
296    }
297
298    output = getOutput(streamType);
299    if (output == 0) {
300        return PERMISSION_DENIED;
301    }
302
303    return getLatency(output, streamType, latency);
304}
305
306status_t AudioSystem::getLatency(audio_io_handle_t output,
307                                 audio_stream_type_t streamType,
308                                 uint32_t* latency)
309{
310    OutputDescriptor *outputDesc;
311
312    gLock.lock();
313    outputDesc = AudioSystem::gOutputs.valueFor(output);
314    if (outputDesc == NULL) {
315        gLock.unlock();
316        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
317        if (af == 0) return PERMISSION_DENIED;
318        *latency = af->latency(output);
319    } else {
320        *latency = outputDesc->latency;
321        gLock.unlock();
322    }
323
324    ALOGV("getLatency() streamType %d, output %d, latency %d", streamType, output, *latency);
325
326    return NO_ERROR;
327}
328
329status_t AudioSystem::getInputBufferSize(uint32_t sampleRate, audio_format_t format,
330        audio_channel_mask_t channelMask, size_t* buffSize)
331{
332    gLock.lock();
333    // Do we have a stale gInBufferSize or are we requesting the input buffer size for new values
334    size_t inBuffSize = gInBuffSize;
335    if ((inBuffSize == 0) || (sampleRate != gPrevInSamplingRate) || (format != gPrevInFormat)
336        || (channelMask != gPrevInChannelMask)) {
337        gLock.unlock();
338        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
339        if (af == 0) {
340            return PERMISSION_DENIED;
341        }
342        inBuffSize = af->getInputBufferSize(sampleRate, format, channelMask);
343        gLock.lock();
344        // save the request params
345        gPrevInSamplingRate = sampleRate;
346        gPrevInFormat = format;
347        gPrevInChannelMask = channelMask;
348
349        gInBuffSize = inBuffSize;
350    }
351    gLock.unlock();
352    *buffSize = inBuffSize;
353
354    return NO_ERROR;
355}
356
357status_t AudioSystem::setVoiceVolume(float value)
358{
359    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
360    if (af == 0) return PERMISSION_DENIED;
361    return af->setVoiceVolume(value);
362}
363
364status_t AudioSystem::getRenderPosition(size_t *halFrames, size_t *dspFrames,
365        audio_stream_type_t stream)
366{
367    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
368    if (af == 0) return PERMISSION_DENIED;
369
370    if (stream == AUDIO_STREAM_DEFAULT) {
371        stream = AUDIO_STREAM_MUSIC;
372    }
373
374    return af->getRenderPosition(halFrames, dspFrames, getOutput(stream));
375}
376
377size_t AudioSystem::getInputFramesLost(audio_io_handle_t ioHandle) {
378    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
379    unsigned int result = 0;
380    if (af == 0) return result;
381    if (ioHandle == 0) return result;
382
383    result = af->getInputFramesLost(ioHandle);
384    return result;
385}
386
387int AudioSystem::newAudioSessionId() {
388    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
389    if (af == 0) return 0;
390    return af->newAudioSessionId();
391}
392
393void AudioSystem::acquireAudioSessionId(int audioSession) {
394    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
395    if (af != 0) {
396        af->acquireAudioSessionId(audioSession);
397    }
398}
399
400void AudioSystem::releaseAudioSessionId(int audioSession) {
401    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
402    if (af != 0) {
403        af->releaseAudioSessionId(audioSession);
404    }
405}
406
407// ---------------------------------------------------------------------------
408
409void AudioSystem::AudioFlingerClient::binderDied(const wp<IBinder>& who) {
410    Mutex::Autolock _l(AudioSystem::gLock);
411
412    AudioSystem::gAudioFlinger.clear();
413    // clear output handles and stream to output map caches
414    AudioSystem::gOutputs.clear();
415
416    if (gAudioErrorCallback) {
417        gAudioErrorCallback(DEAD_OBJECT);
418    }
419    ALOGW("AudioFlinger server died!");
420}
421
422void AudioSystem::AudioFlingerClient::ioConfigChanged(int event, audio_io_handle_t ioHandle,
423        const void *param2) {
424    ALOGV("ioConfigChanged() event %d", event);
425    const OutputDescriptor *desc;
426    audio_stream_type_t stream;
427
428    if (ioHandle == 0) return;
429
430    Mutex::Autolock _l(AudioSystem::gLock);
431
432    switch (event) {
433    case STREAM_CONFIG_CHANGED:
434        break;
435    case OUTPUT_OPENED: {
436        if (gOutputs.indexOfKey(ioHandle) >= 0) {
437            ALOGV("ioConfigChanged() opening already existing output! %d", ioHandle);
438            break;
439        }
440        if (param2 == NULL) break;
441        desc = (const OutputDescriptor *)param2;
442
443        OutputDescriptor *outputDesc =  new OutputDescriptor(*desc);
444        gOutputs.add(ioHandle, outputDesc);
445        ALOGV("ioConfigChanged() new output samplingRate %u, format %d channels %#x frameCount %u "
446                "latency %d",
447                outputDesc->samplingRate, outputDesc->format, outputDesc->channels,
448                outputDesc->frameCount, outputDesc->latency);
449        } break;
450    case OUTPUT_CLOSED: {
451        if (gOutputs.indexOfKey(ioHandle) < 0) {
452            ALOGW("ioConfigChanged() closing unknow output! %d", ioHandle);
453            break;
454        }
455        ALOGV("ioConfigChanged() output %d closed", ioHandle);
456
457        gOutputs.removeItem(ioHandle);
458        } break;
459
460    case OUTPUT_CONFIG_CHANGED: {
461        int index = gOutputs.indexOfKey(ioHandle);
462        if (index < 0) {
463            ALOGW("ioConfigChanged() modifying unknow output! %d", ioHandle);
464            break;
465        }
466        if (param2 == NULL) break;
467        desc = (const OutputDescriptor *)param2;
468
469        ALOGV("ioConfigChanged() new config for output %d samplingRate %u, format %d channels %#x "
470                "frameCount %d latency %d",
471                ioHandle, desc->samplingRate, desc->format,
472                desc->channels, desc->frameCount, desc->latency);
473        OutputDescriptor *outputDesc = gOutputs.valueAt(index);
474        delete outputDesc;
475        outputDesc =  new OutputDescriptor(*desc);
476        gOutputs.replaceValueFor(ioHandle, outputDesc);
477    } break;
478    case INPUT_OPENED:
479    case INPUT_CLOSED:
480    case INPUT_CONFIG_CHANGED:
481        break;
482
483    }
484}
485
486void AudioSystem::setErrorCallback(audio_error_callback cb) {
487    Mutex::Autolock _l(gLock);
488    gAudioErrorCallback = cb;
489}
490
491bool AudioSystem::routedToA2dpOutput(audio_stream_type_t streamType) {
492    switch (streamType) {
493    case AUDIO_STREAM_MUSIC:
494    case AUDIO_STREAM_VOICE_CALL:
495    case AUDIO_STREAM_BLUETOOTH_SCO:
496    case AUDIO_STREAM_SYSTEM:
497        return true;
498    default:
499        return false;
500    }
501}
502
503
504// client singleton for AudioPolicyService binder interface
505sp<IAudioPolicyService> AudioSystem::gAudioPolicyService;
506sp<AudioSystem::AudioPolicyServiceClient> AudioSystem::gAudioPolicyServiceClient;
507
508
509// establish binder interface to AudioPolicy service
510const sp<IAudioPolicyService>& AudioSystem::get_audio_policy_service()
511{
512    gLock.lock();
513    if (gAudioPolicyService == 0) {
514        sp<IServiceManager> sm = defaultServiceManager();
515        sp<IBinder> binder;
516        do {
517            binder = sm->getService(String16("media.audio_policy"));
518            if (binder != 0)
519                break;
520            ALOGW("AudioPolicyService not published, waiting...");
521            usleep(500000); // 0.5 s
522        } while (true);
523        if (gAudioPolicyServiceClient == NULL) {
524            gAudioPolicyServiceClient = new AudioPolicyServiceClient();
525        }
526        binder->linkToDeath(gAudioPolicyServiceClient);
527        gAudioPolicyService = interface_cast<IAudioPolicyService>(binder);
528        gLock.unlock();
529    } else {
530        gLock.unlock();
531    }
532    return gAudioPolicyService;
533}
534
535status_t AudioSystem::setDeviceConnectionState(audio_devices_t device,
536                                               audio_policy_dev_state_t state,
537                                               const char *device_address)
538{
539    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
540    const char *address = "";
541
542    if (aps == 0) return PERMISSION_DENIED;
543
544    if (device_address != NULL) {
545        address = device_address;
546    }
547
548    return aps->setDeviceConnectionState(device, state, address);
549}
550
551audio_policy_dev_state_t AudioSystem::getDeviceConnectionState(audio_devices_t device,
552                                                  const char *device_address)
553{
554    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
555    if (aps == 0) return AUDIO_POLICY_DEVICE_STATE_UNAVAILABLE;
556
557    return aps->getDeviceConnectionState(device, device_address);
558}
559
560status_t AudioSystem::setPhoneState(audio_mode_t state)
561{
562    if (uint32_t(state) >= AUDIO_MODE_CNT) return BAD_VALUE;
563    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
564    if (aps == 0) return PERMISSION_DENIED;
565
566    return aps->setPhoneState(state);
567}
568
569status_t AudioSystem::setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config)
570{
571    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
572    if (aps == 0) return PERMISSION_DENIED;
573    return aps->setForceUse(usage, config);
574}
575
576audio_policy_forced_cfg_t AudioSystem::getForceUse(audio_policy_force_use_t usage)
577{
578    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
579    if (aps == 0) return AUDIO_POLICY_FORCE_NONE;
580    return aps->getForceUse(usage);
581}
582
583
584audio_io_handle_t AudioSystem::getOutput(audio_stream_type_t stream,
585                                    uint32_t samplingRate,
586                                    audio_format_t format,
587                                    audio_channel_mask_t channelMask,
588                                    audio_output_flags_t flags)
589{
590    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
591    if (aps == 0) return 0;
592    return aps->getOutput(stream, samplingRate, format, channelMask, flags);
593}
594
595status_t AudioSystem::startOutput(audio_io_handle_t output,
596                                  audio_stream_type_t stream,
597                                  int session)
598{
599    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
600    if (aps == 0) return PERMISSION_DENIED;
601    return aps->startOutput(output, stream, session);
602}
603
604status_t AudioSystem::stopOutput(audio_io_handle_t output,
605                                 audio_stream_type_t stream,
606                                 int session)
607{
608    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
609    if (aps == 0) return PERMISSION_DENIED;
610    return aps->stopOutput(output, stream, session);
611}
612
613void AudioSystem::releaseOutput(audio_io_handle_t output)
614{
615    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
616    if (aps == 0) return;
617    aps->releaseOutput(output);
618}
619
620audio_io_handle_t AudioSystem::getInput(audio_source_t inputSource,
621                                    uint32_t samplingRate,
622                                    audio_format_t format,
623                                    audio_channel_mask_t channelMask,
624                                    int sessionId)
625{
626    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
627    if (aps == 0) return 0;
628    return aps->getInput(inputSource, samplingRate, format, channelMask, sessionId);
629}
630
631status_t AudioSystem::startInput(audio_io_handle_t input)
632{
633    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
634    if (aps == 0) return PERMISSION_DENIED;
635    return aps->startInput(input);
636}
637
638status_t AudioSystem::stopInput(audio_io_handle_t input)
639{
640    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
641    if (aps == 0) return PERMISSION_DENIED;
642    return aps->stopInput(input);
643}
644
645void AudioSystem::releaseInput(audio_io_handle_t input)
646{
647    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
648    if (aps == 0) return;
649    aps->releaseInput(input);
650}
651
652status_t AudioSystem::initStreamVolume(audio_stream_type_t stream,
653                                    int indexMin,
654                                    int indexMax)
655{
656    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
657    if (aps == 0) return PERMISSION_DENIED;
658    return aps->initStreamVolume(stream, indexMin, indexMax);
659}
660
661status_t AudioSystem::setStreamVolumeIndex(audio_stream_type_t stream,
662                                           int index,
663                                           audio_devices_t device)
664{
665    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
666    if (aps == 0) return PERMISSION_DENIED;
667    return aps->setStreamVolumeIndex(stream, index, device);
668}
669
670status_t AudioSystem::getStreamVolumeIndex(audio_stream_type_t stream,
671                                           int *index,
672                                           audio_devices_t device)
673{
674    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
675    if (aps == 0) return PERMISSION_DENIED;
676    return aps->getStreamVolumeIndex(stream, index, device);
677}
678
679uint32_t AudioSystem::getStrategyForStream(audio_stream_type_t stream)
680{
681    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
682    if (aps == 0) return 0;
683    return aps->getStrategyForStream(stream);
684}
685
686audio_devices_t AudioSystem::getDevicesForStream(audio_stream_type_t stream)
687{
688    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
689    if (aps == 0) return (audio_devices_t)0;
690    return aps->getDevicesForStream(stream);
691}
692
693audio_io_handle_t AudioSystem::getOutputForEffect(const effect_descriptor_t *desc)
694{
695    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
696    if (aps == 0) return PERMISSION_DENIED;
697    return aps->getOutputForEffect(desc);
698}
699
700status_t AudioSystem::registerEffect(const effect_descriptor_t *desc,
701                                audio_io_handle_t io,
702                                uint32_t strategy,
703                                int session,
704                                int id)
705{
706    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
707    if (aps == 0) return PERMISSION_DENIED;
708    return aps->registerEffect(desc, io, strategy, session, id);
709}
710
711status_t AudioSystem::unregisterEffect(int id)
712{
713    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
714    if (aps == 0) return PERMISSION_DENIED;
715    return aps->unregisterEffect(id);
716}
717
718status_t AudioSystem::setEffectEnabled(int id, bool enabled)
719{
720    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
721    if (aps == 0) return PERMISSION_DENIED;
722    return aps->setEffectEnabled(id, enabled);
723}
724
725status_t AudioSystem::isStreamActive(audio_stream_type_t stream, bool* state, uint32_t inPastMs)
726{
727    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
728    if (aps == 0) return PERMISSION_DENIED;
729    if (state == NULL) return BAD_VALUE;
730    *state = aps->isStreamActive(stream, inPastMs);
731    return NO_ERROR;
732}
733
734status_t AudioSystem::isSourceActive(audio_source_t stream, bool* state)
735{
736    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
737    if (aps == 0) return PERMISSION_DENIED;
738    if (state == NULL) return BAD_VALUE;
739    *state = aps->isSourceActive(stream);
740    return NO_ERROR;
741}
742
743uint32_t AudioSystem::getPrimaryOutputSamplingRate()
744{
745    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
746    if (af == 0) return 0;
747    return af->getPrimaryOutputSamplingRate();
748}
749
750size_t AudioSystem::getPrimaryOutputFrameCount()
751{
752    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
753    if (af == 0) return 0;
754    return af->getPrimaryOutputFrameCount();
755}
756
757void AudioSystem::clearAudioConfigCache()
758{
759    Mutex::Autolock _l(gLock);
760    ALOGV("clearAudioConfigCache()");
761    gOutputs.clear();
762}
763
764// ---------------------------------------------------------------------------
765
766void AudioSystem::AudioPolicyServiceClient::binderDied(const wp<IBinder>& who) {
767    Mutex::Autolock _l(AudioSystem::gLock);
768    AudioSystem::gAudioPolicyService.clear();
769
770    ALOGW("AudioPolicyService server died!");
771}
772
773}; // namespace android
774