AudioSystem.cpp revision 2301acc6a9c7a3af4ad01f3d1d0f76f13eca7350 
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;
35sp<IAudioFlinger> AudioSystem::gAudioFlinger;
36sp<AudioSystem::AudioFlingerClient> AudioSystem::gAudioFlingerClient;
37audio_error_callback AudioSystem::gAudioErrorCallback = NULL;
38
39// Cached values for output handles
40DefaultKeyedVector<audio_io_handle_t, AudioSystem::OutputDescriptor *> AudioSystem::gOutputs(NULL);
41
42// Cached values for recording queries, all protected by gLock
43uint32_t AudioSystem::gPrevInSamplingRate;
44audio_format_t AudioSystem::gPrevInFormat;
45audio_channel_mask_t AudioSystem::gPrevInChannelMask;
46size_t AudioSystem::gInBuffSize = 0;    // zero indicates cache is invalid
47
48
49// establish binder interface to AudioFlinger service
50const sp<IAudioFlinger>& AudioSystem::get_audio_flinger()
51{
52    Mutex::Autolock _l(gLock);
53    if (gAudioFlinger == 0) {
54        sp<IServiceManager> sm = defaultServiceManager();
55        sp<IBinder> binder;
56        do {
57            binder = sm->getService(String16("media.audio_flinger"));
58            if (binder != 0)
59                break;
60            ALOGW("AudioFlinger not published, waiting...");
61            usleep(500000); // 0.5 s
62        } while (true);
63        if (gAudioFlingerClient == NULL) {
64            gAudioFlingerClient = new AudioFlingerClient();
65        } else {
66            if (gAudioErrorCallback) {
67                gAudioErrorCallback(NO_ERROR);
68            }
69        }
70        binder->linkToDeath(gAudioFlingerClient);
71        gAudioFlinger = interface_cast<IAudioFlinger>(binder);
72        gAudioFlinger->registerClient(gAudioFlingerClient);
73    }
74    ALOGE_IF(gAudioFlinger==0, "no AudioFlinger!?");
75
76    return gAudioFlinger;
77}
78
79/* static */ status_t AudioSystem::checkAudioFlinger()
80{
81    if (defaultServiceManager()->checkService(String16("media.audio_flinger")) != 0) {
82        return NO_ERROR;
83    }
84    return DEAD_OBJECT;
85}
86
87status_t AudioSystem::muteMicrophone(bool state)
88{
89    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
90    if (af == 0) return PERMISSION_DENIED;
91    return af->setMicMute(state);
92}
93
94status_t AudioSystem::isMicrophoneMuted(bool* state)
95{
96    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
97    if (af == 0) return PERMISSION_DENIED;
98    *state = af->getMicMute();
99    return NO_ERROR;
100}
101
102status_t AudioSystem::setMasterVolume(float value)
103{
104    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
105    if (af == 0) return PERMISSION_DENIED;
106    af->setMasterVolume(value);
107    return NO_ERROR;
108}
109
110status_t AudioSystem::setMasterMute(bool mute)
111{
112    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
113    if (af == 0) return PERMISSION_DENIED;
114    af->setMasterMute(mute);
115    return NO_ERROR;
116}
117
118status_t AudioSystem::getMasterVolume(float* volume)
119{
120    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
121    if (af == 0) return PERMISSION_DENIED;
122    *volume = af->masterVolume();
123    return NO_ERROR;
124}
125
126status_t AudioSystem::getMasterMute(bool* mute)
127{
128    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
129    if (af == 0) return PERMISSION_DENIED;
130    *mute = af->masterMute();
131    return NO_ERROR;
132}
133
134status_t AudioSystem::setStreamVolume(audio_stream_type_t stream, float value,
135        audio_io_handle_t output)
136{
137    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
138    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
139    if (af == 0) return PERMISSION_DENIED;
140    af->setStreamVolume(stream, value, output);
141    return NO_ERROR;
142}
143
144status_t AudioSystem::setStreamMute(audio_stream_type_t stream, bool mute)
145{
146    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
147    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
148    if (af == 0) return PERMISSION_DENIED;
149    af->setStreamMute(stream, mute);
150    return NO_ERROR;
151}
152
153status_t AudioSystem::getStreamVolume(audio_stream_type_t stream, float* volume,
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    *volume = af->streamVolume(stream, output);
160    return NO_ERROR;
161}
162
163status_t AudioSystem::getStreamMute(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    *mute = af->streamMute(stream);
169    return NO_ERROR;
170}
171
172status_t AudioSystem::setMode(audio_mode_t mode)
173{
174    if (uint32_t(mode) >= AUDIO_MODE_CNT) return BAD_VALUE;
175    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
176    if (af == 0) return PERMISSION_DENIED;
177    return af->setMode(mode);
178}
179
180status_t AudioSystem::setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs)
181{
182    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
183    if (af == 0) return PERMISSION_DENIED;
184    return af->setParameters(ioHandle, keyValuePairs);
185}
186
187String8 AudioSystem::getParameters(audio_io_handle_t ioHandle, const String8& keys)
188{
189    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
190    String8 result = String8("");
191    if (af == 0) return result;
192
193    result = af->getParameters(ioHandle, keys);
194    return result;
195}
196
197status_t AudioSystem::setParameters(const String8& keyValuePairs)
198{
199    return setParameters((audio_io_handle_t) 0, keyValuePairs);
200}
201
202String8 AudioSystem::getParameters(const String8& keys)
203{
204    return getParameters((audio_io_handle_t) 0, keys);
205}
206
207// convert volume steps to natural log scale
208
209// change this value to change volume scaling
210static const float dBPerStep = 0.5f;
211// shouldn't need to touch these
212static const float dBConvert = -dBPerStep * 2.302585093f / 20.0f;
213static const float dBConvertInverse = 1.0f / dBConvert;
214
215float AudioSystem::linearToLog(int volume)
216{
217    // float v = volume ? exp(float(100 - volume) * dBConvert) : 0;
218    // ALOGD("linearToLog(%d)=%f", volume, v);
219    // return v;
220    return volume ? exp(float(100 - volume) * dBConvert) : 0;
221}
222
223int AudioSystem::logToLinear(float volume)
224{
225    // int v = volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
226    // ALOGD("logTolinear(%d)=%f", v, volume);
227    // return v;
228    return volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
229}
230
231status_t AudioSystem::getOutputSamplingRate(uint32_t* samplingRate, audio_stream_type_t streamType)
232{
233    audio_io_handle_t output;
234
235    if (streamType == AUDIO_STREAM_DEFAULT) {
236        streamType = AUDIO_STREAM_MUSIC;
237    }
238
239    output = getOutput(streamType);
240    if (output == 0) {
241        return PERMISSION_DENIED;
242    }
243
244    return getSamplingRate(output, streamType, samplingRate);
245}
246
247status_t AudioSystem::getSamplingRate(audio_io_handle_t output,
248                                      audio_stream_type_t streamType,
249                                      uint32_t* samplingRate)
250{
251    OutputDescriptor *outputDesc;
252
253    gLock.lock();
254    outputDesc = AudioSystem::gOutputs.valueFor(output);
255    if (outputDesc == NULL) {
256        ALOGV("getOutputSamplingRate() no output descriptor for output %d in gOutputs", output);
257        gLock.unlock();
258        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
259        if (af == 0) return PERMISSION_DENIED;
260        *samplingRate = af->sampleRate(output);
261    } else {
262        ALOGV("getOutputSamplingRate() reading from output desc");
263        *samplingRate = outputDesc->samplingRate;
264        gLock.unlock();
265    }
266    if (*samplingRate == 0) {
267        ALOGE("AudioSystem::getSamplingRate failed for output %d stream type %d",
268                output, streamType);
269        return BAD_VALUE;
270    }
271
272    ALOGV("getSamplingRate() streamType %d, output %d, sampling rate %u", streamType, output,
273            *samplingRate);
274
275    return NO_ERROR;
276}
277
278status_t AudioSystem::getOutputFrameCount(size_t* frameCount, audio_stream_type_t streamType)
279{
280    audio_io_handle_t output;
281
282    if (streamType == AUDIO_STREAM_DEFAULT) {
283        streamType = AUDIO_STREAM_MUSIC;
284    }
285
286    output = getOutput(streamType);
287    if (output == 0) {
288        return PERMISSION_DENIED;
289    }
290
291    return getFrameCount(output, streamType, frameCount);
292}
293
294status_t AudioSystem::getFrameCount(audio_io_handle_t output,
295                                    audio_stream_type_t streamType,
296                                    size_t* frameCount)
297{
298    OutputDescriptor *outputDesc;
299
300    gLock.lock();
301    outputDesc = AudioSystem::gOutputs.valueFor(output);
302    if (outputDesc == NULL) {
303        gLock.unlock();
304        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
305        if (af == 0) return PERMISSION_DENIED;
306        *frameCount = af->frameCount(output);
307    } else {
308        *frameCount = outputDesc->frameCount;
309        gLock.unlock();
310    }
311    if (*frameCount == 0) {
312        ALOGE("AudioSystem::getFrameCount failed for output %d stream type %d",
313                output, streamType);
314        return BAD_VALUE;
315    }
316
317    ALOGV("getFrameCount() streamType %d, output %d, frameCount %d", streamType, output,
318            *frameCount);
319
320    return NO_ERROR;
321}
322
323status_t AudioSystem::getOutputLatency(uint32_t* latency, audio_stream_type_t streamType)
324{
325    audio_io_handle_t output;
326
327    if (streamType == AUDIO_STREAM_DEFAULT) {
328        streamType = AUDIO_STREAM_MUSIC;
329    }
330
331    output = getOutput(streamType);
332    if (output == 0) {
333        return PERMISSION_DENIED;
334    }
335
336    return getLatency(output, latency);
337}
338
339status_t AudioSystem::getLatency(audio_io_handle_t output,
340                                 uint32_t* latency)
341{
342    OutputDescriptor *outputDesc;
343
344    gLock.lock();
345    outputDesc = AudioSystem::gOutputs.valueFor(output);
346    if (outputDesc == NULL) {
347        gLock.unlock();
348        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
349        if (af == 0) return PERMISSION_DENIED;
350        *latency = af->latency(output);
351    } else {
352        *latency = outputDesc->latency;
353        gLock.unlock();
354    }
355
356    ALOGV("getLatency() output %d, latency %d", output, *latency);
357
358    return NO_ERROR;
359}
360
361status_t AudioSystem::getInputBufferSize(uint32_t sampleRate, audio_format_t format,
362        audio_channel_mask_t channelMask, size_t* buffSize)
363{
364    gLock.lock();
365    // Do we have a stale gInBufferSize or are we requesting the input buffer size for new values
366    size_t inBuffSize = gInBuffSize;
367    if ((inBuffSize == 0) || (sampleRate != gPrevInSamplingRate) || (format != gPrevInFormat)
368        || (channelMask != gPrevInChannelMask)) {
369        gLock.unlock();
370        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
371        if (af == 0) {
372            return PERMISSION_DENIED;
373        }
374        inBuffSize = af->getInputBufferSize(sampleRate, format, channelMask);
375        if (inBuffSize == 0) {
376            ALOGE("AudioSystem::getInputBufferSize failed sampleRate %d format %#x channelMask %x",
377                    sampleRate, format, channelMask);
378            return BAD_VALUE;
379        }
380        // A benign race is possible here: we could overwrite a fresher cache entry
381        gLock.lock();
382        // save the request params
383        gPrevInSamplingRate = sampleRate;
384        gPrevInFormat = format;
385        gPrevInChannelMask = channelMask;
386
387        gInBuffSize = inBuffSize;
388    }
389    gLock.unlock();
390    *buffSize = inBuffSize;
391
392    return NO_ERROR;
393}
394
395status_t AudioSystem::setVoiceVolume(float value)
396{
397    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
398    if (af == 0) return PERMISSION_DENIED;
399    return af->setVoiceVolume(value);
400}
401
402status_t AudioSystem::getRenderPosition(audio_io_handle_t output, uint32_t *halFrames,
403                                        uint32_t *dspFrames)
404{
405    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
406    if (af == 0) return PERMISSION_DENIED;
407
408    return af->getRenderPosition(halFrames, dspFrames, output);
409}
410
411uint32_t AudioSystem::getInputFramesLost(audio_io_handle_t ioHandle)
412{
413    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
414    uint32_t result = 0;
415    if (af == 0) return result;
416    if (ioHandle == 0) return result;
417
418    result = af->getInputFramesLost(ioHandle);
419    return result;
420}
421
422int AudioSystem::newAudioSessionId()
423{
424    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
425    if (af == 0) return AUDIO_SESSION_ALLOCATE;
426    return af->newAudioSessionId();
427}
428
429void AudioSystem::acquireAudioSessionId(int audioSession, pid_t pid)
430{
431    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
432    if (af != 0) {
433        af->acquireAudioSessionId(audioSession, pid);
434    }
435}
436
437void AudioSystem::releaseAudioSessionId(int audioSession, pid_t pid)
438{
439    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
440    if (af != 0) {
441        af->releaseAudioSessionId(audioSession, pid);
442    }
443}
444
445// ---------------------------------------------------------------------------
446
447void AudioSystem::AudioFlingerClient::binderDied(const wp<IBinder>& who __unused)
448{
449    Mutex::Autolock _l(AudioSystem::gLock);
450
451    AudioSystem::gAudioFlinger.clear();
452    // clear output handles and stream to output map caches
453    AudioSystem::gOutputs.clear();
454
455    if (gAudioErrorCallback) {
456        gAudioErrorCallback(DEAD_OBJECT);
457    }
458    ALOGW("AudioFlinger server died!");
459}
460
461void AudioSystem::AudioFlingerClient::ioConfigChanged(int event, audio_io_handle_t ioHandle,
462        const void *param2) {
463    ALOGV("ioConfigChanged() event %d", event);
464    const OutputDescriptor *desc;
465    audio_stream_type_t stream;
466
467    if (ioHandle == 0) return;
468
469    Mutex::Autolock _l(AudioSystem::gLock);
470
471    switch (event) {
472    case STREAM_CONFIG_CHANGED:
473        break;
474    case OUTPUT_OPENED: {
475        if (gOutputs.indexOfKey(ioHandle) >= 0) {
476            ALOGV("ioConfigChanged() opening already existing output! %d", ioHandle);
477            break;
478        }
479        if (param2 == NULL) break;
480        desc = (const OutputDescriptor *)param2;
481
482        OutputDescriptor *outputDesc =  new OutputDescriptor(*desc);
483        gOutputs.add(ioHandle, outputDesc);
484        ALOGV("ioConfigChanged() new output samplingRate %u, format %#x channel mask %#x frameCount %u "
485                "latency %d",
486                outputDesc->samplingRate, outputDesc->format, outputDesc->channelMask,
487                outputDesc->frameCount, outputDesc->latency);
488        } break;
489    case OUTPUT_CLOSED: {
490        if (gOutputs.indexOfKey(ioHandle) < 0) {
491            ALOGW("ioConfigChanged() closing unknown output! %d", ioHandle);
492            break;
493        }
494        ALOGV("ioConfigChanged() output %d closed", ioHandle);
495
496        gOutputs.removeItem(ioHandle);
497        } break;
498
499    case OUTPUT_CONFIG_CHANGED: {
500        int index = gOutputs.indexOfKey(ioHandle);
501        if (index < 0) {
502            ALOGW("ioConfigChanged() modifying unknown output! %d", ioHandle);
503            break;
504        }
505        if (param2 == NULL) break;
506        desc = (const OutputDescriptor *)param2;
507
508        ALOGV("ioConfigChanged() new config for output %d samplingRate %u, format %#x channel mask %#x "
509                "frameCount %d latency %d",
510                ioHandle, desc->samplingRate, desc->format,
511                desc->channelMask, desc->frameCount, desc->latency);
512        OutputDescriptor *outputDesc = gOutputs.valueAt(index);
513        delete outputDesc;
514        outputDesc =  new OutputDescriptor(*desc);
515        gOutputs.replaceValueFor(ioHandle, outputDesc);
516    } break;
517    case INPUT_OPENED:
518    case INPUT_CLOSED:
519    case INPUT_CONFIG_CHANGED:
520        break;
521
522    }
523}
524
525void AudioSystem::setErrorCallback(audio_error_callback cb)
526{
527    Mutex::Autolock _l(gLock);
528    gAudioErrorCallback = cb;
529}
530
531bool AudioSystem::routedToA2dpOutput(audio_stream_type_t streamType)
532{
533    switch (streamType) {
534    case AUDIO_STREAM_MUSIC:
535    case AUDIO_STREAM_VOICE_CALL:
536    case AUDIO_STREAM_BLUETOOTH_SCO:
537    case AUDIO_STREAM_SYSTEM:
538        return true;
539    default:
540        return false;
541    }
542}
543
544
545// client singleton for AudioPolicyService binder interface
546sp<IAudioPolicyService> AudioSystem::gAudioPolicyService;
547sp<AudioSystem::AudioPolicyServiceClient> AudioSystem::gAudioPolicyServiceClient;
548
549
550// establish binder interface to AudioPolicy service
551const sp<IAudioPolicyService>& AudioSystem::get_audio_policy_service()
552{
553    gLock.lock();
554    if (gAudioPolicyService == 0) {
555        sp<IServiceManager> sm = defaultServiceManager();
556        sp<IBinder> binder;
557        do {
558            binder = sm->getService(String16("media.audio_policy"));
559            if (binder != 0)
560                break;
561            ALOGW("AudioPolicyService not published, waiting...");
562            usleep(500000); // 0.5 s
563        } while (true);
564        if (gAudioPolicyServiceClient == NULL) {
565            gAudioPolicyServiceClient = new AudioPolicyServiceClient();
566        }
567        binder->linkToDeath(gAudioPolicyServiceClient);
568        gAudioPolicyService = interface_cast<IAudioPolicyService>(binder);
569        gLock.unlock();
570    } else {
571        gLock.unlock();
572    }
573    return gAudioPolicyService;
574}
575
576// ---------------------------------------------------------------------------
577
578status_t AudioSystem::setDeviceConnectionState(audio_devices_t device,
579                                               audio_policy_dev_state_t state,
580                                               const char *device_address)
581{
582    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
583    const char *address = "";
584
585    if (aps == 0) return PERMISSION_DENIED;
586
587    if (device_address != NULL) {
588        address = device_address;
589    }
590
591    return aps->setDeviceConnectionState(device, state, address);
592}
593
594audio_policy_dev_state_t AudioSystem::getDeviceConnectionState(audio_devices_t device,
595                                                  const char *device_address)
596{
597    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
598    if (aps == 0) return AUDIO_POLICY_DEVICE_STATE_UNAVAILABLE;
599
600    return aps->getDeviceConnectionState(device, device_address);
601}
602
603status_t AudioSystem::setPhoneState(audio_mode_t state)
604{
605    if (uint32_t(state) >= AUDIO_MODE_CNT) return BAD_VALUE;
606    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
607    if (aps == 0) return PERMISSION_DENIED;
608
609    return aps->setPhoneState(state);
610}
611
612status_t AudioSystem::setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config)
613{
614    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
615    if (aps == 0) return PERMISSION_DENIED;
616    return aps->setForceUse(usage, config);
617}
618
619audio_policy_forced_cfg_t AudioSystem::getForceUse(audio_policy_force_use_t usage)
620{
621    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
622    if (aps == 0) return AUDIO_POLICY_FORCE_NONE;
623    return aps->getForceUse(usage);
624}
625
626
627audio_io_handle_t AudioSystem::getOutput(audio_stream_type_t stream,
628                                    uint32_t samplingRate,
629                                    audio_format_t format,
630                                    audio_channel_mask_t channelMask,
631                                    audio_output_flags_t flags,
632                                    const audio_offload_info_t *offloadInfo)
633{
634    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
635    if (aps == 0) return 0;
636    return aps->getOutput(stream, samplingRate, format, channelMask, flags, offloadInfo);
637}
638
639status_t AudioSystem::startOutput(audio_io_handle_t output,
640                                  audio_stream_type_t stream,
641                                  int session)
642{
643    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
644    if (aps == 0) return PERMISSION_DENIED;
645    return aps->startOutput(output, stream, session);
646}
647
648status_t AudioSystem::stopOutput(audio_io_handle_t output,
649                                 audio_stream_type_t stream,
650                                 int session)
651{
652    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
653    if (aps == 0) return PERMISSION_DENIED;
654    return aps->stopOutput(output, stream, session);
655}
656
657void AudioSystem::releaseOutput(audio_io_handle_t output)
658{
659    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
660    if (aps == 0) return;
661    aps->releaseOutput(output);
662}
663
664audio_io_handle_t AudioSystem::getInput(audio_source_t inputSource,
665                                    uint32_t samplingRate,
666                                    audio_format_t format,
667                                    audio_channel_mask_t channelMask,
668                                    int sessionId)
669{
670    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
671    if (aps == 0) return 0;
672    return aps->getInput(inputSource, samplingRate, format, channelMask, sessionId);
673}
674
675status_t AudioSystem::startInput(audio_io_handle_t input)
676{
677    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
678    if (aps == 0) return PERMISSION_DENIED;
679    return aps->startInput(input);
680}
681
682status_t AudioSystem::stopInput(audio_io_handle_t input)
683{
684    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
685    if (aps == 0) return PERMISSION_DENIED;
686    return aps->stopInput(input);
687}
688
689void AudioSystem::releaseInput(audio_io_handle_t input)
690{
691    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
692    if (aps == 0) return;
693    aps->releaseInput(input);
694}
695
696status_t AudioSystem::initStreamVolume(audio_stream_type_t stream,
697                                    int indexMin,
698                                    int indexMax)
699{
700    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
701    if (aps == 0) return PERMISSION_DENIED;
702    return aps->initStreamVolume(stream, indexMin, indexMax);
703}
704
705status_t AudioSystem::setStreamVolumeIndex(audio_stream_type_t stream,
706                                           int index,
707                                           audio_devices_t device)
708{
709    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
710    if (aps == 0) return PERMISSION_DENIED;
711    return aps->setStreamVolumeIndex(stream, index, device);
712}
713
714status_t AudioSystem::getStreamVolumeIndex(audio_stream_type_t stream,
715                                           int *index,
716                                           audio_devices_t device)
717{
718    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
719    if (aps == 0) return PERMISSION_DENIED;
720    return aps->getStreamVolumeIndex(stream, index, device);
721}
722
723uint32_t AudioSystem::getStrategyForStream(audio_stream_type_t stream)
724{
725    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
726    if (aps == 0) return 0;
727    return aps->getStrategyForStream(stream);
728}
729
730audio_devices_t AudioSystem::getDevicesForStream(audio_stream_type_t stream)
731{
732    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
733    if (aps == 0) return AUDIO_DEVICE_NONE;
734    return aps->getDevicesForStream(stream);
735}
736
737audio_io_handle_t AudioSystem::getOutputForEffect(const effect_descriptor_t *desc)
738{
739    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
740    // FIXME change return type to status_t, and return PERMISSION_DENIED here
741    if (aps == 0) return 0;
742    return aps->getOutputForEffect(desc);
743}
744
745status_t AudioSystem::registerEffect(const effect_descriptor_t *desc,
746                                audio_io_handle_t io,
747                                uint32_t strategy,
748                                int session,
749                                int id)
750{
751    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
752    if (aps == 0) return PERMISSION_DENIED;
753    return aps->registerEffect(desc, io, strategy, session, id);
754}
755
756status_t AudioSystem::unregisterEffect(int id)
757{
758    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
759    if (aps == 0) return PERMISSION_DENIED;
760    return aps->unregisterEffect(id);
761}
762
763status_t AudioSystem::setEffectEnabled(int id, bool enabled)
764{
765    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
766    if (aps == 0) return PERMISSION_DENIED;
767    return aps->setEffectEnabled(id, enabled);
768}
769
770status_t AudioSystem::isStreamActive(audio_stream_type_t stream, bool* state, uint32_t inPastMs)
771{
772    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
773    if (aps == 0) return PERMISSION_DENIED;
774    if (state == NULL) return BAD_VALUE;
775    *state = aps->isStreamActive(stream, inPastMs);
776    return NO_ERROR;
777}
778
779status_t AudioSystem::isStreamActiveRemotely(audio_stream_type_t stream, bool* state,
780        uint32_t inPastMs)
781{
782    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
783    if (aps == 0) return PERMISSION_DENIED;
784    if (state == NULL) return BAD_VALUE;
785    *state = aps->isStreamActiveRemotely(stream, inPastMs);
786    return NO_ERROR;
787}
788
789status_t AudioSystem::isSourceActive(audio_source_t stream, bool* state)
790{
791    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
792    if (aps == 0) return PERMISSION_DENIED;
793    if (state == NULL) return BAD_VALUE;
794    *state = aps->isSourceActive(stream);
795    return NO_ERROR;
796}
797
798uint32_t AudioSystem::getPrimaryOutputSamplingRate()
799{
800    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
801    if (af == 0) return 0;
802    return af->getPrimaryOutputSamplingRate();
803}
804
805size_t AudioSystem::getPrimaryOutputFrameCount()
806{
807    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
808    if (af == 0) return 0;
809    return af->getPrimaryOutputFrameCount();
810}
811
812status_t AudioSystem::setLowRamDevice(bool isLowRamDevice)
813{
814    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
815    if (af == 0) return PERMISSION_DENIED;
816    return af->setLowRamDevice(isLowRamDevice);
817}
818
819void AudioSystem::clearAudioConfigCache()
820{
821    Mutex::Autolock _l(gLock);
822    ALOGV("clearAudioConfigCache()");
823    gOutputs.clear();
824}
825
826bool AudioSystem::isOffloadSupported(const audio_offload_info_t& info)
827{
828    ALOGV("isOffloadSupported()");
829    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
830    if (aps == 0) return false;
831    return aps->isOffloadSupported(info);
832}
833
834// ---------------------------------------------------------------------------
835
836void AudioSystem::AudioPolicyServiceClient::binderDied(const wp<IBinder>& who __unused)
837{
838    Mutex::Autolock _l(AudioSystem::gLock);
839    AudioSystem::gAudioPolicyService.clear();
840
841    ALOGW("AudioPolicyService server died!");
842}
843
844}; // namespace android
845