AudioSystem.cpp revision 3bba0e0a60b15895134bc2c731d21fd7ebd28784 
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
38DefaultKeyedVector<int, audio_io_handle_t> AudioSystem::gStreamOutputMap(0);
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;
43int 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.get() == 0) {
53        sp<IServiceManager> sm = defaultServiceManager();
54        sp<IBinder> binder;
55        do {
56            binder = sm->getService(String16("media.audio_flinger"));
57            if (binder != 0)
58                break;
59            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(int stream, float value, int output)
124{
125    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
126    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
127    if (af == 0) return PERMISSION_DENIED;
128    af->setStreamVolume(stream, value, output);
129    return NO_ERROR;
130}
131
132status_t AudioSystem::setStreamMute(int stream, bool mute)
133{
134    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
135    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
136    if (af == 0) return PERMISSION_DENIED;
137    af->setStreamMute(stream, mute);
138    return NO_ERROR;
139}
140
141status_t AudioSystem::getStreamVolume(int stream, float* volume, int output)
142{
143    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
144    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
145    if (af == 0) return PERMISSION_DENIED;
146    *volume = af->streamVolume(stream, output);
147    return NO_ERROR;
148}
149
150status_t AudioSystem::getStreamMute(int stream, bool* mute)
151{
152    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
153    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
154    if (af == 0) return PERMISSION_DENIED;
155    *mute = af->streamMute(stream);
156    return NO_ERROR;
157}
158
159status_t AudioSystem::setMode(int mode)
160{
161    if (uint32_t(mode) >= AUDIO_MODE_CNT) return BAD_VALUE;
162    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
163    if (af == 0) return PERMISSION_DENIED;
164    return af->setMode(mode);
165}
166
167status_t AudioSystem::setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs) {
168    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
169    if (af == 0) return PERMISSION_DENIED;
170    return af->setParameters(ioHandle, keyValuePairs);
171}
172
173String8 AudioSystem::getParameters(audio_io_handle_t ioHandle, const String8& keys) {
174    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
175    String8 result = String8("");
176    if (af == 0) return result;
177
178    result = af->getParameters(ioHandle, keys);
179    return result;
180}
181
182// convert volume steps to natural log scale
183
184// change this value to change volume scaling
185static const float dBPerStep = 0.5f;
186// shouldn't need to touch these
187static const float dBConvert = -dBPerStep * 2.302585093f / 20.0f;
188static const float dBConvertInverse = 1.0f / dBConvert;
189
190float AudioSystem::linearToLog(int volume)
191{
192    // float v = volume ? exp(float(100 - volume) * dBConvert) : 0;
193    // ALOGD("linearToLog(%d)=%f", volume, v);
194    // return v;
195    return volume ? exp(float(100 - volume) * dBConvert) : 0;
196}
197
198int AudioSystem::logToLinear(float volume)
199{
200    // int v = volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
201    // ALOGD("logTolinear(%d)=%f", v, volume);
202    // return v;
203    return volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
204}
205
206status_t AudioSystem::getOutputSamplingRate(int* samplingRate, int streamType)
207{
208    OutputDescriptor *outputDesc;
209    audio_io_handle_t output;
210
211    if (streamType == AUDIO_STREAM_DEFAULT) {
212        streamType = AUDIO_STREAM_MUSIC;
213    }
214
215    output = getOutput((audio_stream_type_t)streamType);
216    if (output == 0) {
217        return PERMISSION_DENIED;
218    }
219
220    gLock.lock();
221    outputDesc = AudioSystem::gOutputs.valueFor(output);
222    if (outputDesc == 0) {
223        ALOGV("getOutputSamplingRate() no output descriptor for output %d in gOutputs", output);
224        gLock.unlock();
225        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
226        if (af == 0) return PERMISSION_DENIED;
227        *samplingRate = af->sampleRate(output);
228    } else {
229        ALOGV("getOutputSamplingRate() reading from output desc");
230        *samplingRate = outputDesc->samplingRate;
231        gLock.unlock();
232    }
233
234    ALOGV("getOutputSamplingRate() streamType %d, output %d, sampling rate %d", streamType, output, *samplingRate);
235
236    return NO_ERROR;
237}
238
239status_t AudioSystem::getOutputFrameCount(int* frameCount, int streamType)
240{
241    OutputDescriptor *outputDesc;
242    audio_io_handle_t output;
243
244    if (streamType == AUDIO_STREAM_DEFAULT) {
245        streamType = AUDIO_STREAM_MUSIC;
246    }
247
248    output = getOutput((audio_stream_type_t)streamType);
249    if (output == 0) {
250        return PERMISSION_DENIED;
251    }
252
253    gLock.lock();
254    outputDesc = AudioSystem::gOutputs.valueFor(output);
255    if (outputDesc == 0) {
256        gLock.unlock();
257        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
258        if (af == 0) return PERMISSION_DENIED;
259        *frameCount = af->frameCount(output);
260    } else {
261        *frameCount = outputDesc->frameCount;
262        gLock.unlock();
263    }
264
265    ALOGV("getOutputFrameCount() streamType %d, output %d, frameCount %d", streamType, output, *frameCount);
266
267    return NO_ERROR;
268}
269
270status_t AudioSystem::getOutputLatency(uint32_t* latency, int streamType)
271{
272    OutputDescriptor *outputDesc;
273    audio_io_handle_t output;
274
275    if (streamType == AUDIO_STREAM_DEFAULT) {
276        streamType = AUDIO_STREAM_MUSIC;
277    }
278
279    output = getOutput((audio_stream_type_t)streamType);
280    if (output == 0) {
281        return PERMISSION_DENIED;
282    }
283
284    gLock.lock();
285    outputDesc = AudioSystem::gOutputs.valueFor(output);
286    if (outputDesc == 0) {
287        gLock.unlock();
288        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
289        if (af == 0) return PERMISSION_DENIED;
290        *latency = af->latency(output);
291    } else {
292        *latency = outputDesc->latency;
293        gLock.unlock();
294    }
295
296    ALOGV("getOutputLatency() streamType %d, output %d, latency %d", streamType, output, *latency);
297
298    return NO_ERROR;
299}
300
301status_t AudioSystem::getInputBufferSize(uint32_t sampleRate, int format, int channelCount,
302    size_t* buffSize)
303{
304    gLock.lock();
305    // Do we have a stale gInBufferSize or are we requesting the input buffer size for new values
306    size_t inBuffSize = gInBuffSize;
307    if ((inBuffSize == 0) || (sampleRate != gPrevInSamplingRate) || (format != gPrevInFormat)
308        || (channelCount != gPrevInChannelCount)) {
309        gLock.unlock();
310        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
311        if (af == 0) {
312            return PERMISSION_DENIED;
313        }
314        inBuffSize = af->getInputBufferSize(sampleRate, format, channelCount);
315        gLock.lock();
316        // save the request params
317        gPrevInSamplingRate = sampleRate;
318        gPrevInFormat = format;
319        gPrevInChannelCount = channelCount;
320
321        gInBuffSize = inBuffSize;
322    }
323    gLock.unlock();
324    *buffSize = inBuffSize;
325
326    return NO_ERROR;
327}
328
329status_t AudioSystem::setVoiceVolume(float value)
330{
331    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
332    if (af == 0) return PERMISSION_DENIED;
333    return af->setVoiceVolume(value);
334}
335
336status_t AudioSystem::getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int stream)
337{
338    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
339    if (af == 0) return PERMISSION_DENIED;
340
341    if (stream == AUDIO_STREAM_DEFAULT) {
342        stream = AUDIO_STREAM_MUSIC;
343    }
344
345    return af->getRenderPosition(halFrames, dspFrames, getOutput((audio_stream_type_t)stream));
346}
347
348unsigned int AudioSystem::getInputFramesLost(audio_io_handle_t ioHandle) {
349    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
350    unsigned int result = 0;
351    if (af == 0) return result;
352    if (ioHandle == 0) return result;
353
354    result = af->getInputFramesLost(ioHandle);
355    return result;
356}
357
358int AudioSystem::newAudioSessionId() {
359    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
360    if (af == 0) return 0;
361    return af->newAudioSessionId();
362}
363
364void AudioSystem::acquireAudioSessionId(int audioSession) {
365    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
366    if (af != 0) {
367        af->acquireAudioSessionId(audioSession);
368    }
369}
370
371void AudioSystem::releaseAudioSessionId(int audioSession) {
372    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
373    if (af != 0) {
374        af->releaseAudioSessionId(audioSession);
375    }
376}
377
378// ---------------------------------------------------------------------------
379
380void AudioSystem::AudioFlingerClient::binderDied(const wp<IBinder>& who) {
381    Mutex::Autolock _l(AudioSystem::gLock);
382
383    AudioSystem::gAudioFlinger.clear();
384    // clear output handles and stream to output map caches
385    AudioSystem::gStreamOutputMap.clear();
386    AudioSystem::gOutputs.clear();
387
388    if (gAudioErrorCallback) {
389        gAudioErrorCallback(DEAD_OBJECT);
390    }
391    ALOGW("AudioFlinger server died!");
392}
393
394void AudioSystem::AudioFlingerClient::ioConfigChanged(int event, int ioHandle, void *param2) {
395    ALOGV("ioConfigChanged() event %d", event);
396    OutputDescriptor *desc;
397    uint32_t stream;
398
399    if (ioHandle == 0) return;
400
401    Mutex::Autolock _l(AudioSystem::gLock);
402
403    switch (event) {
404    case STREAM_CONFIG_CHANGED:
405        if (param2 == 0) break;
406        stream = *(uint32_t *)param2;
407        ALOGV("ioConfigChanged() STREAM_CONFIG_CHANGED stream %d, output %d", stream, ioHandle);
408        if (gStreamOutputMap.indexOfKey(stream) >= 0) {
409            gStreamOutputMap.replaceValueFor(stream, ioHandle);
410        }
411        break;
412    case OUTPUT_OPENED: {
413        if (gOutputs.indexOfKey(ioHandle) >= 0) {
414            ALOGV("ioConfigChanged() opening already existing output! %d", ioHandle);
415            break;
416        }
417        if (param2 == 0) break;
418        desc = (OutputDescriptor *)param2;
419
420        OutputDescriptor *outputDesc =  new OutputDescriptor(*desc);
421        gOutputs.add(ioHandle, outputDesc);
422        ALOGV("ioConfigChanged() new output samplingRate %d, format %d channels %d frameCount %d latency %d",
423                outputDesc->samplingRate, outputDesc->format, outputDesc->channels, outputDesc->frameCount, outputDesc->latency);
424        } break;
425    case OUTPUT_CLOSED: {
426        if (gOutputs.indexOfKey(ioHandle) < 0) {
427            ALOGW("ioConfigChanged() closing unknow output! %d", ioHandle);
428            break;
429        }
430        ALOGV("ioConfigChanged() output %d closed", ioHandle);
431
432        gOutputs.removeItem(ioHandle);
433        for (int i = gStreamOutputMap.size() - 1; i >= 0 ; i--) {
434            if (gStreamOutputMap.valueAt(i) == ioHandle) {
435                gStreamOutputMap.removeItemsAt(i);
436            }
437        }
438        } break;
439
440    case OUTPUT_CONFIG_CHANGED: {
441        int index = gOutputs.indexOfKey(ioHandle);
442        if (index < 0) {
443            ALOGW("ioConfigChanged() modifying unknow output! %d", ioHandle);
444            break;
445        }
446        if (param2 == 0) break;
447        desc = (OutputDescriptor *)param2;
448
449        ALOGV("ioConfigChanged() new config for output %d samplingRate %d, format %d channels %d frameCount %d latency %d",
450                ioHandle, desc->samplingRate, desc->format,
451                desc->channels, desc->frameCount, desc->latency);
452        OutputDescriptor *outputDesc = gOutputs.valueAt(index);
453        delete outputDesc;
454        outputDesc =  new OutputDescriptor(*desc);
455        gOutputs.replaceValueFor(ioHandle, outputDesc);
456    } break;
457    case INPUT_OPENED:
458    case INPUT_CLOSED:
459    case INPUT_CONFIG_CHANGED:
460        break;
461
462    }
463}
464
465void AudioSystem::setErrorCallback(audio_error_callback cb) {
466    Mutex::Autolock _l(gLock);
467    gAudioErrorCallback = cb;
468}
469
470bool AudioSystem::routedToA2dpOutput(int streamType) {
471    switch(streamType) {
472    case AUDIO_STREAM_MUSIC:
473    case AUDIO_STREAM_VOICE_CALL:
474    case AUDIO_STREAM_BLUETOOTH_SCO:
475    case AUDIO_STREAM_SYSTEM:
476        return true;
477    default:
478        return false;
479    }
480}
481
482
483// client singleton for AudioPolicyService binder interface
484sp<IAudioPolicyService> AudioSystem::gAudioPolicyService;
485sp<AudioSystem::AudioPolicyServiceClient> AudioSystem::gAudioPolicyServiceClient;
486
487
488// establish binder interface to AudioFlinger service
489const sp<IAudioPolicyService>& AudioSystem::get_audio_policy_service()
490{
491    gLock.lock();
492    if (gAudioPolicyService.get() == 0) {
493        sp<IServiceManager> sm = defaultServiceManager();
494        sp<IBinder> binder;
495        do {
496            binder = sm->getService(String16("media.audio_policy"));
497            if (binder != 0)
498                break;
499            ALOGW("AudioPolicyService not published, waiting...");
500            usleep(500000); // 0.5 s
501        } while(true);
502        if (gAudioPolicyServiceClient == NULL) {
503            gAudioPolicyServiceClient = new AudioPolicyServiceClient();
504        }
505        binder->linkToDeath(gAudioPolicyServiceClient);
506        gAudioPolicyService = interface_cast<IAudioPolicyService>(binder);
507        gLock.unlock();
508    } else {
509        gLock.unlock();
510    }
511    return gAudioPolicyService;
512}
513
514status_t AudioSystem::setDeviceConnectionState(audio_devices_t device,
515                                               audio_policy_dev_state_t state,
516                                               const char *device_address)
517{
518    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
519    const char *address = "";
520
521    if (aps == 0) return PERMISSION_DENIED;
522
523    if (device_address != NULL) {
524        address = device_address;
525    }
526
527    return aps->setDeviceConnectionState(device, state, address);
528}
529
530audio_policy_dev_state_t AudioSystem::getDeviceConnectionState(audio_devices_t device,
531                                                  const char *device_address)
532{
533    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
534    if (aps == 0) return AUDIO_POLICY_DEVICE_STATE_UNAVAILABLE;
535
536    return aps->getDeviceConnectionState(device, device_address);
537}
538
539status_t AudioSystem::setPhoneState(int state)
540{
541    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
542    if (aps == 0) return PERMISSION_DENIED;
543
544    return aps->setPhoneState(state);
545}
546
547status_t AudioSystem::setRingerMode(uint32_t mode, uint32_t mask)
548{
549    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
550    if (aps == 0) return PERMISSION_DENIED;
551    return aps->setRingerMode(mode, mask);
552}
553
554status_t AudioSystem::setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config)
555{
556    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
557    if (aps == 0) return PERMISSION_DENIED;
558    return aps->setForceUse(usage, config);
559}
560
561audio_policy_forced_cfg_t AudioSystem::getForceUse(audio_policy_force_use_t usage)
562{
563    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
564    if (aps == 0) return AUDIO_POLICY_FORCE_NONE;
565    return aps->getForceUse(usage);
566}
567
568
569audio_io_handle_t AudioSystem::getOutput(audio_stream_type_t stream,
570                                    uint32_t samplingRate,
571                                    uint32_t format,
572                                    uint32_t channels,
573                                    audio_policy_output_flags_t flags)
574{
575    audio_io_handle_t output = 0;
576    // Do not use stream to output map cache if the direct output
577    // flag is set or if we are likely to use a direct output
578    // (e.g voice call stream @ 8kHz could use BT SCO device and be routed to
579    // a direct output on some platforms).
580    // TODO: the output cache and stream to output mapping implementation needs to
581    // be reworked for proper operation with direct outputs. This code is too specific
582    // to the first use case we want to cover (Voice Recognition and Voice Dialer over
583    // Bluetooth SCO
584    if ((flags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT) == 0 &&
585        ((stream != AUDIO_STREAM_VOICE_CALL && stream != AUDIO_STREAM_BLUETOOTH_SCO) ||
586         channels != AUDIO_CHANNEL_OUT_MONO ||
587         (samplingRate != 8000 && samplingRate != 16000))) {
588        Mutex::Autolock _l(gLock);
589        output = AudioSystem::gStreamOutputMap.valueFor(stream);
590        ALOGV_IF((output != 0), "getOutput() read %d from cache for stream %d", output, stream);
591    }
592    if (output == 0) {
593        const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
594        if (aps == 0) return 0;
595        output = aps->getOutput(stream, samplingRate, format, channels, flags);
596        if ((flags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT) == 0) {
597            Mutex::Autolock _l(gLock);
598            AudioSystem::gStreamOutputMap.add(stream, output);
599        }
600    }
601    return output;
602}
603
604status_t AudioSystem::startOutput(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->startOutput(output, stream, session);
611}
612
613status_t AudioSystem::stopOutput(audio_io_handle_t output,
614                                 audio_stream_type_t stream,
615                                 int session)
616{
617    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
618    if (aps == 0) return PERMISSION_DENIED;
619    return aps->stopOutput(output, stream, session);
620}
621
622void AudioSystem::releaseOutput(audio_io_handle_t output)
623{
624    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
625    if (aps == 0) return;
626    aps->releaseOutput(output);
627}
628
629audio_io_handle_t AudioSystem::getInput(int inputSource,
630                                    uint32_t samplingRate,
631                                    uint32_t format,
632                                    uint32_t channels,
633                                    audio_in_acoustics_t acoustics,
634                                    int sessionId)
635{
636    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
637    if (aps == 0) return 0;
638    return aps->getInput(inputSource, samplingRate, format, channels, acoustics, sessionId);
639}
640
641status_t AudioSystem::startInput(audio_io_handle_t input)
642{
643    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
644    if (aps == 0) return PERMISSION_DENIED;
645    return aps->startInput(input);
646}
647
648status_t AudioSystem::stopInput(audio_io_handle_t input)
649{
650    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
651    if (aps == 0) return PERMISSION_DENIED;
652    return aps->stopInput(input);
653}
654
655void AudioSystem::releaseInput(audio_io_handle_t input)
656{
657    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
658    if (aps == 0) return;
659    aps->releaseInput(input);
660}
661
662status_t AudioSystem::initStreamVolume(audio_stream_type_t stream,
663                                    int indexMin,
664                                    int indexMax)
665{
666    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
667    if (aps == 0) return PERMISSION_DENIED;
668    return aps->initStreamVolume(stream, indexMin, indexMax);
669}
670
671status_t AudioSystem::setStreamVolumeIndex(audio_stream_type_t stream, int index)
672{
673    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
674    if (aps == 0) return PERMISSION_DENIED;
675    return aps->setStreamVolumeIndex(stream, index);
676}
677
678status_t AudioSystem::getStreamVolumeIndex(audio_stream_type_t stream, int *index)
679{
680    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
681    if (aps == 0) return PERMISSION_DENIED;
682    return aps->getStreamVolumeIndex(stream, index);
683}
684
685uint32_t AudioSystem::getStrategyForStream(audio_stream_type_t stream)
686{
687    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
688    if (aps == 0) return 0;
689    return aps->getStrategyForStream(stream);
690}
691
692uint32_t AudioSystem::getDevicesForStream(audio_stream_type_t stream)
693{
694    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
695    if (aps == 0) return 0;
696    return aps->getDevicesForStream(stream);
697}
698
699audio_io_handle_t AudioSystem::getOutputForEffect(effect_descriptor_t *desc)
700{
701    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
702    if (aps == 0) return PERMISSION_DENIED;
703    return aps->getOutputForEffect(desc);
704}
705
706status_t AudioSystem::registerEffect(effect_descriptor_t *desc,
707                                audio_io_handle_t io,
708                                uint32_t strategy,
709                                int session,
710                                int id)
711{
712    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
713    if (aps == 0) return PERMISSION_DENIED;
714    return aps->registerEffect(desc, io, strategy, session, id);
715}
716
717status_t AudioSystem::unregisterEffect(int id)
718{
719    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
720    if (aps == 0) return PERMISSION_DENIED;
721    return aps->unregisterEffect(id);
722}
723
724status_t AudioSystem::setEffectEnabled(int id, bool enabled)
725{
726    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
727    if (aps == 0) return PERMISSION_DENIED;
728    return aps->setEffectEnabled(id, enabled);
729}
730
731status_t AudioSystem::isStreamActive(int stream, bool* state, uint32_t inPastMs)
732{
733    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
734    if (aps == 0) return PERMISSION_DENIED;
735    if (state == NULL) return BAD_VALUE;
736    *state = aps->isStreamActive(stream, inPastMs);
737    return NO_ERROR;
738}
739
740
741void AudioSystem::clearAudioConfigCache()
742{
743    Mutex::Autolock _l(gLock);
744    ALOGV("clearAudioConfigCache()");
745    gStreamOutputMap.clear();
746    gOutputs.clear();
747}
748
749// ---------------------------------------------------------------------------
750
751void AudioSystem::AudioPolicyServiceClient::binderDied(const wp<IBinder>& who) {
752    Mutex::Autolock _l(AudioSystem::gLock);
753    AudioSystem::gAudioPolicyService.clear();
754
755    ALOGW("AudioPolicyService server died!");
756}
757
758}; // namespace android
759
760