AudioSystem.cpp revision 0ca3cf94c0dfc173ad7886ae162c4b67067539f6 
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;
44int AudioSystem::gPrevInChannelCount = 1;
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
208// DEPRECATED
209status_t AudioSystem::getOutputSamplingRate(int* samplingRate, int streamType) {
210    return getOutputSamplingRate(samplingRate, (audio_stream_type_t)streamType);
211}
212
213status_t AudioSystem::getOutputSamplingRate(int* samplingRate, audio_stream_type_t streamType)
214{
215    audio_io_handle_t output;
216
217    if (streamType == AUDIO_STREAM_DEFAULT) {
218        streamType = AUDIO_STREAM_MUSIC;
219    }
220
221    output = getOutput(streamType);
222    if (output == 0) {
223        return PERMISSION_DENIED;
224    }
225
226    return getSamplingRate(output, streamType, samplingRate);
227}
228
229status_t AudioSystem::getSamplingRate(audio_io_handle_t output,
230                                      audio_stream_type_t streamType,
231                                      int* samplingRate)
232{
233    OutputDescriptor *outputDesc;
234
235    gLock.lock();
236    outputDesc = AudioSystem::gOutputs.valueFor(output);
237    if (outputDesc == NULL) {
238        ALOGV("getOutputSamplingRate() no output descriptor for output %d in gOutputs", output);
239        gLock.unlock();
240        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
241        if (af == 0) return PERMISSION_DENIED;
242        *samplingRate = af->sampleRate(output);
243    } else {
244        ALOGV("getOutputSamplingRate() reading from output desc");
245        *samplingRate = outputDesc->samplingRate;
246        gLock.unlock();
247    }
248
249    ALOGV("getSamplingRate() streamType %d, output %d, sampling rate %d", streamType, output, *samplingRate);
250
251    return NO_ERROR;
252}
253
254// DEPRECATED
255status_t AudioSystem::getOutputFrameCount(int* frameCount, int streamType) {
256    return getOutputFrameCount(frameCount, (audio_stream_type_t)streamType);
257}
258
259status_t AudioSystem::getOutputFrameCount(int* frameCount, audio_stream_type_t streamType)
260{
261    audio_io_handle_t output;
262
263    if (streamType == AUDIO_STREAM_DEFAULT) {
264        streamType = AUDIO_STREAM_MUSIC;
265    }
266
267    output = getOutput(streamType);
268    if (output == 0) {
269        return PERMISSION_DENIED;
270    }
271
272    return getFrameCount(output, streamType, frameCount);
273}
274
275status_t AudioSystem::getFrameCount(audio_io_handle_t output,
276                                    audio_stream_type_t streamType,
277                                    int* frameCount)
278{
279    OutputDescriptor *outputDesc;
280
281    gLock.lock();
282    outputDesc = AudioSystem::gOutputs.valueFor(output);
283    if (outputDesc == NULL) {
284        gLock.unlock();
285        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
286        if (af == 0) return PERMISSION_DENIED;
287        *frameCount = af->frameCount(output);
288    } else {
289        *frameCount = outputDesc->frameCount;
290        gLock.unlock();
291    }
292
293    ALOGV("getFrameCount() streamType %d, output %d, frameCount %d", streamType, output, *frameCount);
294
295    return NO_ERROR;
296}
297
298status_t AudioSystem::getOutputLatency(uint32_t* latency, audio_stream_type_t streamType)
299{
300    audio_io_handle_t output;
301
302    if (streamType == AUDIO_STREAM_DEFAULT) {
303        streamType = AUDIO_STREAM_MUSIC;
304    }
305
306    output = getOutput(streamType);
307    if (output == 0) {
308        return PERMISSION_DENIED;
309    }
310
311    return getLatency(output, streamType, latency);
312}
313
314status_t AudioSystem::getLatency(audio_io_handle_t output,
315                                 audio_stream_type_t streamType,
316                                 uint32_t* latency)
317{
318    OutputDescriptor *outputDesc;
319
320    gLock.lock();
321    outputDesc = AudioSystem::gOutputs.valueFor(output);
322    if (outputDesc == NULL) {
323        gLock.unlock();
324        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
325        if (af == 0) return PERMISSION_DENIED;
326        *latency = af->latency(output);
327    } else {
328        *latency = outputDesc->latency;
329        gLock.unlock();
330    }
331
332    ALOGV("getLatency() streamType %d, output %d, latency %d", streamType, output, *latency);
333
334    return NO_ERROR;
335}
336
337status_t AudioSystem::getInputBufferSize(uint32_t sampleRate, audio_format_t format, int channelCount,
338    size_t* buffSize)
339{
340    gLock.lock();
341    // Do we have a stale gInBufferSize or are we requesting the input buffer size for new values
342    size_t inBuffSize = gInBuffSize;
343    if ((inBuffSize == 0) || (sampleRate != gPrevInSamplingRate) || (format != gPrevInFormat)
344        || (channelCount != gPrevInChannelCount)) {
345        gLock.unlock();
346        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
347        if (af == 0) {
348            return PERMISSION_DENIED;
349        }
350        inBuffSize = af->getInputBufferSize(sampleRate, format, channelCount);
351        gLock.lock();
352        // save the request params
353        gPrevInSamplingRate = sampleRate;
354        gPrevInFormat = format;
355        gPrevInChannelCount = channelCount;
356
357        gInBuffSize = inBuffSize;
358    }
359    gLock.unlock();
360    *buffSize = inBuffSize;
361
362    return NO_ERROR;
363}
364
365status_t AudioSystem::setVoiceVolume(float value)
366{
367    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
368    if (af == 0) return PERMISSION_DENIED;
369    return af->setVoiceVolume(value);
370}
371
372status_t AudioSystem::getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, audio_stream_type_t stream)
373{
374    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
375    if (af == 0) return PERMISSION_DENIED;
376
377    if (stream == AUDIO_STREAM_DEFAULT) {
378        stream = AUDIO_STREAM_MUSIC;
379    }
380
381    return af->getRenderPosition(halFrames, dspFrames, getOutput(stream));
382}
383
384unsigned int AudioSystem::getInputFramesLost(audio_io_handle_t ioHandle) {
385    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
386    unsigned int result = 0;
387    if (af == 0) return result;
388    if (ioHandle == 0) return result;
389
390    result = af->getInputFramesLost(ioHandle);
391    return result;
392}
393
394int AudioSystem::newAudioSessionId() {
395    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
396    if (af == 0) return 0;
397    return af->newAudioSessionId();
398}
399
400void AudioSystem::acquireAudioSessionId(int audioSession) {
401    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
402    if (af != 0) {
403        af->acquireAudioSessionId(audioSession);
404    }
405}
406
407void AudioSystem::releaseAudioSessionId(int audioSession) {
408    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
409    if (af != 0) {
410        af->releaseAudioSessionId(audioSession);
411    }
412}
413
414// ---------------------------------------------------------------------------
415
416void AudioSystem::AudioFlingerClient::binderDied(const wp<IBinder>& who) {
417    Mutex::Autolock _l(AudioSystem::gLock);
418
419    AudioSystem::gAudioFlinger.clear();
420    // clear output handles and stream to output map caches
421    AudioSystem::gOutputs.clear();
422
423    if (gAudioErrorCallback) {
424        gAudioErrorCallback(DEAD_OBJECT);
425    }
426    ALOGW("AudioFlinger server died!");
427}
428
429void AudioSystem::AudioFlingerClient::ioConfigChanged(int event, audio_io_handle_t ioHandle,
430        const void *param2) {
431    ALOGV("ioConfigChanged() event %d", event);
432    const OutputDescriptor *desc;
433    audio_stream_type_t stream;
434
435    if (ioHandle == 0) return;
436
437    Mutex::Autolock _l(AudioSystem::gLock);
438
439    switch (event) {
440    case STREAM_CONFIG_CHANGED:
441        break;
442    case OUTPUT_OPENED: {
443        if (gOutputs.indexOfKey(ioHandle) >= 0) {
444            ALOGV("ioConfigChanged() opening already existing output! %d", ioHandle);
445            break;
446        }
447        if (param2 == NULL) break;
448        desc = (const OutputDescriptor *)param2;
449
450        OutputDescriptor *outputDesc =  new OutputDescriptor(*desc);
451        gOutputs.add(ioHandle, outputDesc);
452        ALOGV("ioConfigChanged() new output samplingRate %d, format %d channels %d frameCount %d latency %d",
453                outputDesc->samplingRate, outputDesc->format, outputDesc->channels, outputDesc->frameCount, outputDesc->latency);
454        } break;
455    case OUTPUT_CLOSED: {
456        if (gOutputs.indexOfKey(ioHandle) < 0) {
457            ALOGW("ioConfigChanged() closing unknow output! %d", ioHandle);
458            break;
459        }
460        ALOGV("ioConfigChanged() output %d closed", ioHandle);
461
462        gOutputs.removeItem(ioHandle);
463        } break;
464
465    case OUTPUT_CONFIG_CHANGED: {
466        int index = gOutputs.indexOfKey(ioHandle);
467        if (index < 0) {
468            ALOGW("ioConfigChanged() modifying unknow output! %d", ioHandle);
469            break;
470        }
471        if (param2 == NULL) break;
472        desc = (const OutputDescriptor *)param2;
473
474        ALOGV("ioConfigChanged() new config for output %d samplingRate %d, format %d channels %d frameCount %d latency %d",
475                ioHandle, desc->samplingRate, desc->format,
476                desc->channels, desc->frameCount, desc->latency);
477        OutputDescriptor *outputDesc = gOutputs.valueAt(index);
478        delete outputDesc;
479        outputDesc =  new OutputDescriptor(*desc);
480        gOutputs.replaceValueFor(ioHandle, outputDesc);
481    } break;
482    case INPUT_OPENED:
483    case INPUT_CLOSED:
484    case INPUT_CONFIG_CHANGED:
485        break;
486
487    }
488}
489
490void AudioSystem::setErrorCallback(audio_error_callback cb) {
491    Mutex::Autolock _l(gLock);
492    gAudioErrorCallback = cb;
493}
494
495bool AudioSystem::routedToA2dpOutput(audio_stream_type_t streamType) {
496    switch (streamType) {
497    case AUDIO_STREAM_MUSIC:
498    case AUDIO_STREAM_VOICE_CALL:
499    case AUDIO_STREAM_BLUETOOTH_SCO:
500    case AUDIO_STREAM_SYSTEM:
501        return true;
502    default:
503        return false;
504    }
505}
506
507
508// client singleton for AudioPolicyService binder interface
509sp<IAudioPolicyService> AudioSystem::gAudioPolicyService;
510sp<AudioSystem::AudioPolicyServiceClient> AudioSystem::gAudioPolicyServiceClient;
511
512
513// establish binder interface to AudioFlinger service
514const sp<IAudioPolicyService>& AudioSystem::get_audio_policy_service()
515{
516    gLock.lock();
517    if (gAudioPolicyService == 0) {
518        sp<IServiceManager> sm = defaultServiceManager();
519        sp<IBinder> binder;
520        do {
521            binder = sm->getService(String16("media.audio_policy"));
522            if (binder != 0)
523                break;
524            ALOGW("AudioPolicyService not published, waiting...");
525            usleep(500000); // 0.5 s
526        } while (true);
527        if (gAudioPolicyServiceClient == NULL) {
528            gAudioPolicyServiceClient = new AudioPolicyServiceClient();
529        }
530        binder->linkToDeath(gAudioPolicyServiceClient);
531        gAudioPolicyService = interface_cast<IAudioPolicyService>(binder);
532        gLock.unlock();
533    } else {
534        gLock.unlock();
535    }
536    return gAudioPolicyService;
537}
538
539status_t AudioSystem::setDeviceConnectionState(audio_devices_t device,
540                                               audio_policy_dev_state_t state,
541                                               const char *device_address)
542{
543    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
544    const char *address = "";
545
546    if (aps == 0) return PERMISSION_DENIED;
547
548    if (device_address != NULL) {
549        address = device_address;
550    }
551
552    return aps->setDeviceConnectionState(device, state, address);
553}
554
555audio_policy_dev_state_t AudioSystem::getDeviceConnectionState(audio_devices_t device,
556                                                  const char *device_address)
557{
558    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
559    if (aps == 0) return AUDIO_POLICY_DEVICE_STATE_UNAVAILABLE;
560
561    return aps->getDeviceConnectionState(device, device_address);
562}
563
564status_t AudioSystem::setPhoneState(audio_mode_t state)
565{
566    if (uint32_t(state) >= AUDIO_MODE_CNT) return BAD_VALUE;
567    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
568    if (aps == 0) return PERMISSION_DENIED;
569
570    return aps->setPhoneState(state);
571}
572
573status_t AudioSystem::setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config)
574{
575    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
576    if (aps == 0) return PERMISSION_DENIED;
577    return aps->setForceUse(usage, config);
578}
579
580audio_policy_forced_cfg_t AudioSystem::getForceUse(audio_policy_force_use_t usage)
581{
582    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
583    if (aps == 0) return AUDIO_POLICY_FORCE_NONE;
584    return aps->getForceUse(usage);
585}
586
587
588audio_io_handle_t AudioSystem::getOutput(audio_stream_type_t stream,
589                                    uint32_t samplingRate,
590                                    audio_format_t format,
591                                    uint32_t channels,
592                                    audio_output_flags_t flags)
593{
594    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
595    if (aps == 0) return 0;
596    return aps->getOutput(stream, samplingRate, format, channels, flags);
597}
598
599status_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
608status_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
617void 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
624audio_io_handle_t AudioSystem::getInput(audio_source_t inputSource,
625                                    uint32_t samplingRate,
626                                    audio_format_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
636status_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
643status_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
650void 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
657status_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
666status_t AudioSystem::setStreamVolumeIndex(audio_stream_type_t stream,
667                                           int index,
668                                           audio_devices_t device)
669{
670    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
671    if (aps == 0) return PERMISSION_DENIED;
672    return aps->setStreamVolumeIndex(stream, index, device);
673}
674
675status_t AudioSystem::getStreamVolumeIndex(audio_stream_type_t stream,
676                                           int *index,
677                                           audio_devices_t device)
678{
679    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
680    if (aps == 0) return PERMISSION_DENIED;
681    return aps->getStreamVolumeIndex(stream, index, device);
682}
683
684uint32_t AudioSystem::getStrategyForStream(audio_stream_type_t stream)
685{
686    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
687    if (aps == 0) return 0;
688    return aps->getStrategyForStream(stream);
689}
690
691audio_devices_t AudioSystem::getDevicesForStream(audio_stream_type_t stream)
692{
693    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
694    if (aps == 0) return (audio_devices_t)0;
695    return aps->getDevicesForStream(stream);
696}
697
698audio_io_handle_t AudioSystem::getOutputForEffect(effect_descriptor_t *desc)
699{
700    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
701    if (aps == 0) return PERMISSION_DENIED;
702    return aps->getOutputForEffect(desc);
703}
704
705status_t AudioSystem::registerEffect(effect_descriptor_t *desc,
706                                audio_io_handle_t io,
707                                uint32_t strategy,
708                                int session,
709                                int id)
710{
711    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
712    if (aps == 0) return PERMISSION_DENIED;
713    return aps->registerEffect(desc, io, strategy, session, id);
714}
715
716status_t AudioSystem::unregisterEffect(int id)
717{
718    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
719    if (aps == 0) return PERMISSION_DENIED;
720    return aps->unregisterEffect(id);
721}
722
723status_t AudioSystem::setEffectEnabled(int id, bool enabled)
724{
725    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
726    if (aps == 0) return PERMISSION_DENIED;
727    return aps->setEffectEnabled(id, enabled);
728}
729
730status_t AudioSystem::isStreamActive(audio_stream_type_t stream, bool* state, uint32_t inPastMs)
731{
732    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
733    if (aps == 0) return PERMISSION_DENIED;
734    if (state == NULL) return BAD_VALUE;
735    *state = aps->isStreamActive(stream, inPastMs);
736    return NO_ERROR;
737}
738
739
740void AudioSystem::clearAudioConfigCache()
741{
742    Mutex::Autolock _l(gLock);
743    ALOGV("clearAudioConfigCache()");
744    gOutputs.clear();
745}
746
747// ---------------------------------------------------------------------------
748
749void AudioSystem::AudioPolicyServiceClient::binderDied(const wp<IBinder>& who) {
750    Mutex::Autolock _l(AudioSystem::gLock);
751    AudioSystem::gAudioPolicyService.clear();
752
753    ALOGW("AudioPolicyService server died!");
754}
755
756}; // namespace android
757