AudioSystem.cpp revision 3a34befc6fb04a4945a849e8bda8b84e4bf973fe 
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
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            LOGW("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    LOGE_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 (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    // LOGD("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    // LOGD("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        LOGV("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        LOGV("getOutputSamplingRate() reading from output desc");
230        *samplingRate = outputDesc->samplingRate;
231        gLock.unlock();
232    }
233
234    LOGV("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    LOGV("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    LOGV("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    // Do we have a stale gInBufferSize or are we requesting the input buffer size for new values
305    if ((gInBuffSize == 0) || (sampleRate != gPrevInSamplingRate) || (format != gPrevInFormat)
306        || (channelCount != gPrevInChannelCount)) {
307        // save the request params
308        gPrevInSamplingRate = sampleRate;
309        gPrevInFormat = format;
310        gPrevInChannelCount = channelCount;
311
312        gInBuffSize = 0;
313        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
314        if (af == 0) {
315            return PERMISSION_DENIED;
316        }
317        gInBuffSize = af->getInputBufferSize(sampleRate, format, channelCount);
318    }
319    *buffSize = gInBuffSize;
320
321    return NO_ERROR;
322}
323
324status_t AudioSystem::setVoiceVolume(float value)
325{
326    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
327    if (af == 0) return PERMISSION_DENIED;
328    return af->setVoiceVolume(value);
329}
330
331status_t AudioSystem::getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int stream)
332{
333    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
334    if (af == 0) return PERMISSION_DENIED;
335
336    if (stream == AUDIO_STREAM_DEFAULT) {
337        stream = AUDIO_STREAM_MUSIC;
338    }
339
340    return af->getRenderPosition(halFrames, dspFrames, getOutput((audio_stream_type_t)stream));
341}
342
343unsigned int AudioSystem::getInputFramesLost(audio_io_handle_t ioHandle) {
344    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
345    unsigned int result = 0;
346    if (af == 0) return result;
347    if (ioHandle == 0) return result;
348
349    result = af->getInputFramesLost(ioHandle);
350    return result;
351}
352
353int AudioSystem::newAudioSessionId() {
354    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
355    if (af == 0) return 0;
356    return af->newAudioSessionId();
357}
358
359void AudioSystem::acquireAudioSessionId(int audioSession) {
360    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
361    if (af != 0) {
362        af->acquireAudioSessionId(audioSession);
363    }
364}
365
366void AudioSystem::releaseAudioSessionId(int audioSession) {
367    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
368    if (af != 0) {
369        af->releaseAudioSessionId(audioSession);
370    }
371}
372
373// ---------------------------------------------------------------------------
374
375void AudioSystem::AudioFlingerClient::binderDied(const wp<IBinder>& who) {
376    Mutex::Autolock _l(AudioSystem::gLock);
377
378    AudioSystem::gAudioFlinger.clear();
379    // clear output handles and stream to output map caches
380    AudioSystem::gStreamOutputMap.clear();
381    AudioSystem::gOutputs.clear();
382
383    if (gAudioErrorCallback) {
384        gAudioErrorCallback(DEAD_OBJECT);
385    }
386    LOGW("AudioFlinger server died!");
387}
388
389void AudioSystem::AudioFlingerClient::ioConfigChanged(int event, int ioHandle, void *param2) {
390    LOGV("ioConfigChanged() event %d", event);
391    OutputDescriptor *desc;
392    uint32_t stream;
393
394    if (ioHandle == 0) return;
395
396    Mutex::Autolock _l(AudioSystem::gLock);
397
398    switch (event) {
399    case STREAM_CONFIG_CHANGED:
400        if (param2 == 0) break;
401        stream = *(uint32_t *)param2;
402        LOGV("ioConfigChanged() STREAM_CONFIG_CHANGED stream %d, output %d", stream, ioHandle);
403        if (gStreamOutputMap.indexOfKey(stream) >= 0) {
404            gStreamOutputMap.replaceValueFor(stream, ioHandle);
405        }
406        break;
407    case OUTPUT_OPENED: {
408        if (gOutputs.indexOfKey(ioHandle) >= 0) {
409            LOGV("ioConfigChanged() opening already existing output! %d", ioHandle);
410            break;
411        }
412        if (param2 == 0) break;
413        desc = (OutputDescriptor *)param2;
414
415        OutputDescriptor *outputDesc =  new OutputDescriptor(*desc);
416        gOutputs.add(ioHandle, outputDesc);
417        LOGV("ioConfigChanged() new output samplingRate %d, format %d channels %d frameCount %d latency %d",
418                outputDesc->samplingRate, outputDesc->format, outputDesc->channels, outputDesc->frameCount, outputDesc->latency);
419        } break;
420    case OUTPUT_CLOSED: {
421        if (gOutputs.indexOfKey(ioHandle) < 0) {
422            LOGW("ioConfigChanged() closing unknow output! %d", ioHandle);
423            break;
424        }
425        LOGV("ioConfigChanged() output %d closed", ioHandle);
426
427        gOutputs.removeItem(ioHandle);
428        for (int i = gStreamOutputMap.size() - 1; i >= 0 ; i--) {
429            if (gStreamOutputMap.valueAt(i) == ioHandle) {
430                gStreamOutputMap.removeItemsAt(i);
431            }
432        }
433        } break;
434
435    case OUTPUT_CONFIG_CHANGED: {
436        int index = gOutputs.indexOfKey(ioHandle);
437        if (index < 0) {
438            LOGW("ioConfigChanged() modifying unknow output! %d", ioHandle);
439            break;
440        }
441        if (param2 == 0) break;
442        desc = (OutputDescriptor *)param2;
443
444        LOGV("ioConfigChanged() new config for output %d samplingRate %d, format %d channels %d frameCount %d latency %d",
445                ioHandle, desc->samplingRate, desc->format,
446                desc->channels, desc->frameCount, desc->latency);
447        OutputDescriptor *outputDesc = gOutputs.valueAt(index);
448        delete outputDesc;
449        outputDesc =  new OutputDescriptor(*desc);
450        gOutputs.replaceValueFor(ioHandle, outputDesc);
451    } break;
452    case INPUT_OPENED:
453    case INPUT_CLOSED:
454    case INPUT_CONFIG_CHANGED:
455        break;
456
457    }
458}
459
460void AudioSystem::setErrorCallback(audio_error_callback cb) {
461    Mutex::Autolock _l(gLock);
462    gAudioErrorCallback = cb;
463}
464
465bool AudioSystem::routedToA2dpOutput(int streamType) {
466    switch(streamType) {
467    case AUDIO_STREAM_MUSIC:
468    case AUDIO_STREAM_VOICE_CALL:
469    case AUDIO_STREAM_BLUETOOTH_SCO:
470    case AUDIO_STREAM_SYSTEM:
471        return true;
472    default:
473        return false;
474    }
475}
476
477
478// client singleton for AudioPolicyService binder interface
479sp<IAudioPolicyService> AudioSystem::gAudioPolicyService;
480sp<AudioSystem::AudioPolicyServiceClient> AudioSystem::gAudioPolicyServiceClient;
481
482
483// establish binder interface to AudioFlinger service
484const sp<IAudioPolicyService>& AudioSystem::get_audio_policy_service()
485{
486    gLock.lock();
487    if (gAudioPolicyService.get() == 0) {
488        sp<IServiceManager> sm = defaultServiceManager();
489        sp<IBinder> binder;
490        do {
491            binder = sm->getService(String16("media.audio_policy"));
492            if (binder != 0)
493                break;
494            LOGW("AudioPolicyService not published, waiting...");
495            usleep(500000); // 0.5 s
496        } while(true);
497        if (gAudioPolicyServiceClient == NULL) {
498            gAudioPolicyServiceClient = new AudioPolicyServiceClient();
499        }
500        binder->linkToDeath(gAudioPolicyServiceClient);
501        gAudioPolicyService = interface_cast<IAudioPolicyService>(binder);
502        gLock.unlock();
503    } else {
504        gLock.unlock();
505    }
506    return gAudioPolicyService;
507}
508
509status_t AudioSystem::setDeviceConnectionState(audio_devices_t device,
510                                               audio_policy_dev_state_t state,
511                                               const char *device_address)
512{
513    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
514    if (aps == 0) return PERMISSION_DENIED;
515
516    return aps->setDeviceConnectionState(device, state, device_address);
517}
518
519audio_policy_dev_state_t AudioSystem::getDeviceConnectionState(audio_devices_t device,
520                                                  const char *device_address)
521{
522    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
523    if (aps == 0) return AUDIO_POLICY_DEVICE_STATE_UNAVAILABLE;
524
525    return aps->getDeviceConnectionState(device, device_address);
526}
527
528status_t AudioSystem::setPhoneState(int state)
529{
530    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
531    if (aps == 0) return PERMISSION_DENIED;
532
533    return aps->setPhoneState(state);
534}
535
536status_t AudioSystem::setRingerMode(uint32_t mode, uint32_t mask)
537{
538    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
539    if (aps == 0) return PERMISSION_DENIED;
540    return aps->setRingerMode(mode, mask);
541}
542
543status_t AudioSystem::setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config)
544{
545    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
546    if (aps == 0) return PERMISSION_DENIED;
547    return aps->setForceUse(usage, config);
548}
549
550audio_policy_forced_cfg_t AudioSystem::getForceUse(audio_policy_force_use_t usage)
551{
552    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
553    if (aps == 0) return AUDIO_POLICY_FORCE_NONE;
554    return aps->getForceUse(usage);
555}
556
557
558audio_io_handle_t AudioSystem::getOutput(audio_stream_type_t stream,
559                                    uint32_t samplingRate,
560                                    uint32_t format,
561                                    uint32_t channels,
562                                    audio_policy_output_flags_t flags)
563{
564    audio_io_handle_t output = 0;
565    // Do not use stream to output map cache if the direct output
566    // flag is set or if we are likely to use a direct output
567    // (e.g voice call stream @ 8kHz could use BT SCO device and be routed to
568    // a direct output on some platforms).
569    // TODO: the output cache and stream to output mapping implementation needs to
570    // be reworked for proper operation with direct outputs. This code is too specific
571    // to the first use case we want to cover (Voice Recognition and Voice Dialer over
572    // Bluetooth SCO
573    if ((flags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT) == 0 &&
574        ((stream != AUDIO_STREAM_VOICE_CALL && stream != AUDIO_STREAM_BLUETOOTH_SCO) ||
575         channels != AUDIO_CHANNEL_OUT_MONO ||
576         (samplingRate != 8000 && samplingRate != 16000))) {
577        Mutex::Autolock _l(gLock);
578        output = AudioSystem::gStreamOutputMap.valueFor(stream);
579        LOGV_IF((output != 0), "getOutput() read %d from cache for stream %d", output, stream);
580    }
581    if (output == 0) {
582        const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
583        if (aps == 0) return 0;
584        output = aps->getOutput(stream, samplingRate, format, channels, flags);
585        if ((flags & AUDIO_POLICY_OUTPUT_FLAG_DIRECT) == 0) {
586            Mutex::Autolock _l(gLock);
587            AudioSystem::gStreamOutputMap.add(stream, output);
588        }
589    }
590    return output;
591}
592
593status_t AudioSystem::startOutput(audio_io_handle_t output,
594                                  audio_stream_type_t stream,
595                                  int session)
596{
597    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
598    if (aps == 0) return PERMISSION_DENIED;
599    return aps->startOutput(output, stream, session);
600}
601
602status_t AudioSystem::stopOutput(audio_io_handle_t output,
603                                 audio_stream_type_t stream,
604                                 int session)
605{
606    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
607    if (aps == 0) return PERMISSION_DENIED;
608    return aps->stopOutput(output, stream, session);
609}
610
611void AudioSystem::releaseOutput(audio_io_handle_t output)
612{
613    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
614    if (aps == 0) return;
615    aps->releaseOutput(output);
616}
617
618audio_io_handle_t AudioSystem::getInput(int inputSource,
619                                    uint32_t samplingRate,
620                                    uint32_t format,
621                                    uint32_t channels,
622                                    audio_in_acoustics_t acoustics,
623                                    int sessionId)
624{
625    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
626    if (aps == 0) return 0;
627    return aps->getInput(inputSource, samplingRate, format, channels, acoustics, sessionId);
628}
629
630status_t AudioSystem::startInput(audio_io_handle_t input)
631{
632    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
633    if (aps == 0) return PERMISSION_DENIED;
634    return aps->startInput(input);
635}
636
637status_t AudioSystem::stopInput(audio_io_handle_t input)
638{
639    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
640    if (aps == 0) return PERMISSION_DENIED;
641    return aps->stopInput(input);
642}
643
644void AudioSystem::releaseInput(audio_io_handle_t input)
645{
646    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
647    if (aps == 0) return;
648    aps->releaseInput(input);
649}
650
651status_t AudioSystem::initStreamVolume(audio_stream_type_t stream,
652                                    int indexMin,
653                                    int indexMax)
654{
655    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
656    if (aps == 0) return PERMISSION_DENIED;
657    return aps->initStreamVolume(stream, indexMin, indexMax);
658}
659
660status_t AudioSystem::setStreamVolumeIndex(audio_stream_type_t stream, int index)
661{
662    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
663    if (aps == 0) return PERMISSION_DENIED;
664    return aps->setStreamVolumeIndex(stream, index);
665}
666
667status_t AudioSystem::getStreamVolumeIndex(audio_stream_type_t stream, int *index)
668{
669    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
670    if (aps == 0) return PERMISSION_DENIED;
671    return aps->getStreamVolumeIndex(stream, index);
672}
673
674uint32_t AudioSystem::getStrategyForStream(audio_stream_type_t stream)
675{
676    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
677    if (aps == 0) return 0;
678    return aps->getStrategyForStream(stream);
679}
680
681uint32_t AudioSystem::getDevicesForStream(audio_stream_type_t stream)
682{
683    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
684    if (aps == 0) return 0;
685    return aps->getDevicesForStream(stream);
686}
687
688audio_io_handle_t AudioSystem::getOutputForEffect(effect_descriptor_t *desc)
689{
690    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
691    if (aps == 0) return PERMISSION_DENIED;
692    return aps->getOutputForEffect(desc);
693}
694
695status_t AudioSystem::registerEffect(effect_descriptor_t *desc,
696                                audio_io_handle_t io,
697                                uint32_t strategy,
698                                int session,
699                                int id)
700{
701    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
702    if (aps == 0) return PERMISSION_DENIED;
703    return aps->registerEffect(desc, io, strategy, session, id);
704}
705
706status_t AudioSystem::unregisterEffect(int id)
707{
708    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
709    if (aps == 0) return PERMISSION_DENIED;
710    return aps->unregisterEffect(id);
711}
712
713status_t AudioSystem::isStreamActive(int stream, bool* state, uint32_t inPastMs)
714{
715    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
716    if (aps == 0) return PERMISSION_DENIED;
717    if (state == NULL) return BAD_VALUE;
718    *state = aps->isStreamActive(stream, inPastMs);
719    return NO_ERROR;
720}
721
722
723// ---------------------------------------------------------------------------
724
725void AudioSystem::AudioPolicyServiceClient::binderDied(const wp<IBinder>& who) {
726    Mutex::Autolock _l(AudioSystem::gLock);
727    AudioSystem::gAudioPolicyService.clear();
728
729    LOGW("AudioPolicyService server died!");
730}
731
732}; // namespace android
733
734