AudioSystem.cpp revision 34fb29696b0f3abf61b10f8d053b1f33d501de0a 
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
48sp<AudioSystem::AudioPortCallback> AudioSystem::gAudioPortCallback;
49
50// establish binder interface to AudioFlinger service
51const sp<IAudioFlinger>& AudioSystem::get_audio_flinger()
52{
53    Mutex::Autolock _l(gLock);
54    if (gAudioFlinger == 0) {
55        sp<IServiceManager> sm = defaultServiceManager();
56        sp<IBinder> binder;
57        do {
58            binder = sm->getService(String16("media.audio_flinger"));
59            if (binder != 0)
60                break;
61            ALOGW("AudioFlinger not published, waiting...");
62            usleep(500000); // 0.5 s
63        } while (true);
64        if (gAudioFlingerClient == NULL) {
65            gAudioFlingerClient = new AudioFlingerClient();
66        } else {
67            if (gAudioErrorCallback) {
68                gAudioErrorCallback(NO_ERROR);
69            }
70        }
71        binder->linkToDeath(gAudioFlingerClient);
72        gAudioFlinger = interface_cast<IAudioFlinger>(binder);
73        gAudioFlinger->registerClient(gAudioFlingerClient);
74    }
75    ALOGE_IF(gAudioFlinger==0, "no AudioFlinger!?");
76
77    return gAudioFlinger;
78}
79
80/* static */ status_t AudioSystem::checkAudioFlinger()
81{
82    if (defaultServiceManager()->checkService(String16("media.audio_flinger")) != 0) {
83        return NO_ERROR;
84    }
85    return DEAD_OBJECT;
86}
87
88status_t AudioSystem::muteMicrophone(bool state)
89{
90    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
91    if (af == 0) return PERMISSION_DENIED;
92    return af->setMicMute(state);
93}
94
95status_t AudioSystem::isMicrophoneMuted(bool* state)
96{
97    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
98    if (af == 0) return PERMISSION_DENIED;
99    *state = af->getMicMute();
100    return NO_ERROR;
101}
102
103status_t AudioSystem::setMasterVolume(float value)
104{
105    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
106    if (af == 0) return PERMISSION_DENIED;
107    af->setMasterVolume(value);
108    return NO_ERROR;
109}
110
111status_t AudioSystem::setMasterMute(bool mute)
112{
113    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
114    if (af == 0) return PERMISSION_DENIED;
115    af->setMasterMute(mute);
116    return NO_ERROR;
117}
118
119status_t AudioSystem::getMasterVolume(float* volume)
120{
121    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
122    if (af == 0) return PERMISSION_DENIED;
123    *volume = af->masterVolume();
124    return NO_ERROR;
125}
126
127status_t AudioSystem::getMasterMute(bool* mute)
128{
129    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
130    if (af == 0) return PERMISSION_DENIED;
131    *mute = af->masterMute();
132    return NO_ERROR;
133}
134
135status_t AudioSystem::setStreamVolume(audio_stream_type_t stream, float value,
136        audio_io_handle_t output)
137{
138    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
139    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
140    if (af == 0) return PERMISSION_DENIED;
141    af->setStreamVolume(stream, value, output);
142    return NO_ERROR;
143}
144
145status_t AudioSystem::setStreamMute(audio_stream_type_t stream, bool mute)
146{
147    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
148    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
149    if (af == 0) return PERMISSION_DENIED;
150    af->setStreamMute(stream, mute);
151    return NO_ERROR;
152}
153
154status_t AudioSystem::getStreamVolume(audio_stream_type_t stream, float* volume,
155        audio_io_handle_t output)
156{
157    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
158    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
159    if (af == 0) return PERMISSION_DENIED;
160    *volume = af->streamVolume(stream, output);
161    return NO_ERROR;
162}
163
164status_t AudioSystem::getStreamMute(audio_stream_type_t stream, bool* mute)
165{
166    if (uint32_t(stream) >= AUDIO_STREAM_CNT) return BAD_VALUE;
167    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
168    if (af == 0) return PERMISSION_DENIED;
169    *mute = af->streamMute(stream);
170    return NO_ERROR;
171}
172
173status_t AudioSystem::setMode(audio_mode_t mode)
174{
175    if (uint32_t(mode) >= AUDIO_MODE_CNT) return BAD_VALUE;
176    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
177    if (af == 0) return PERMISSION_DENIED;
178    return af->setMode(mode);
179}
180
181status_t AudioSystem::setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs)
182{
183    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
184    if (af == 0) return PERMISSION_DENIED;
185    return af->setParameters(ioHandle, keyValuePairs);
186}
187
188String8 AudioSystem::getParameters(audio_io_handle_t ioHandle, const String8& keys)
189{
190    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
191    String8 result = String8("");
192    if (af == 0) return result;
193
194    result = af->getParameters(ioHandle, keys);
195    return result;
196}
197
198status_t AudioSystem::setParameters(const String8& keyValuePairs)
199{
200    return setParameters(AUDIO_IO_HANDLE_NONE, keyValuePairs);
201}
202
203String8 AudioSystem::getParameters(const String8& keys)
204{
205    return getParameters(AUDIO_IO_HANDLE_NONE, keys);
206}
207
208// convert volume steps to natural log scale
209
210// change this value to change volume scaling
211static const float dBPerStep = 0.5f;
212// shouldn't need to touch these
213static const float dBConvert = -dBPerStep * 2.302585093f / 20.0f;
214static const float dBConvertInverse = 1.0f / dBConvert;
215
216float AudioSystem::linearToLog(int volume)
217{
218    // float v = volume ? exp(float(100 - volume) * dBConvert) : 0;
219    // ALOGD("linearToLog(%d)=%f", volume, v);
220    // return v;
221    return volume ? exp(float(100 - volume) * dBConvert) : 0;
222}
223
224int AudioSystem::logToLinear(float volume)
225{
226    // int v = volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
227    // ALOGD("logTolinear(%d)=%f", v, volume);
228    // return v;
229    return volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
230}
231
232status_t AudioSystem::getOutputSamplingRate(uint32_t* samplingRate, audio_stream_type_t streamType)
233{
234    audio_io_handle_t output;
235
236    if (streamType == AUDIO_STREAM_DEFAULT) {
237        streamType = AUDIO_STREAM_MUSIC;
238    }
239
240    output = getOutput(streamType);
241    if (output == 0) {
242        return PERMISSION_DENIED;
243    }
244
245    return getSamplingRate(output, samplingRate);
246}
247
248status_t AudioSystem::getOutputSamplingRateForAttr(uint32_t* samplingRate,
249        const audio_attributes_t *attr)
250{
251    if (attr == NULL) {
252        return BAD_VALUE;
253    }
254    audio_io_handle_t output = getOutputForAttr(attr);
255    if (output == 0) {
256        return PERMISSION_DENIED;
257    }
258    return getSamplingRate(output, samplingRate);
259}
260
261status_t AudioSystem::getSamplingRate(audio_io_handle_t output,
262                                      uint32_t* samplingRate)
263{
264    OutputDescriptor *outputDesc;
265
266    gLock.lock();
267    outputDesc = AudioSystem::gOutputs.valueFor(output);
268    if (outputDesc == NULL) {
269        ALOGV("getOutputSamplingRate() no output descriptor for output %d in gOutputs", output);
270        gLock.unlock();
271        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
272        if (af == 0) return PERMISSION_DENIED;
273        *samplingRate = af->sampleRate(output);
274    } else {
275        ALOGV("getOutputSamplingRate() reading from output desc");
276        *samplingRate = outputDesc->samplingRate;
277        gLock.unlock();
278    }
279    if (*samplingRate == 0) {
280        ALOGE("AudioSystem::getSamplingRate failed for output %d", output);
281        return BAD_VALUE;
282    }
283
284    ALOGV("getSamplingRate() output %d, sampling rate %u", output, *samplingRate);
285
286    return NO_ERROR;
287}
288
289status_t AudioSystem::getOutputFrameCount(size_t* frameCount, audio_stream_type_t streamType)
290{
291    audio_io_handle_t output;
292
293    if (streamType == AUDIO_STREAM_DEFAULT) {
294        streamType = AUDIO_STREAM_MUSIC;
295    }
296
297    output = getOutput(streamType);
298    if (output == AUDIO_IO_HANDLE_NONE) {
299        return PERMISSION_DENIED;
300    }
301
302    return getFrameCount(output, frameCount);
303}
304
305status_t AudioSystem::getFrameCount(audio_io_handle_t output,
306                                    size_t* frameCount)
307{
308    OutputDescriptor *outputDesc;
309
310    gLock.lock();
311    outputDesc = AudioSystem::gOutputs.valueFor(output);
312    if (outputDesc == NULL) {
313        gLock.unlock();
314        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
315        if (af == 0) return PERMISSION_DENIED;
316        *frameCount = af->frameCount(output);
317    } else {
318        *frameCount = outputDesc->frameCount;
319        gLock.unlock();
320    }
321    if (*frameCount == 0) {
322        ALOGE("AudioSystem::getFrameCount failed for output %d", output);
323        return BAD_VALUE;
324    }
325
326    ALOGV("getFrameCount() output %d, frameCount %zu", output, *frameCount);
327
328    return NO_ERROR;
329}
330
331status_t AudioSystem::getOutputLatency(uint32_t* latency, audio_stream_type_t streamType)
332{
333    audio_io_handle_t output;
334
335    if (streamType == AUDIO_STREAM_DEFAULT) {
336        streamType = AUDIO_STREAM_MUSIC;
337    }
338
339    output = getOutput(streamType);
340    if (output == AUDIO_IO_HANDLE_NONE) {
341        return PERMISSION_DENIED;
342    }
343
344    return getLatency(output, latency);
345}
346
347status_t AudioSystem::getLatency(audio_io_handle_t output,
348                                 uint32_t* latency)
349{
350    OutputDescriptor *outputDesc;
351
352    gLock.lock();
353    outputDesc = AudioSystem::gOutputs.valueFor(output);
354    if (outputDesc == NULL) {
355        gLock.unlock();
356        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
357        if (af == 0) return PERMISSION_DENIED;
358        *latency = af->latency(output);
359    } else {
360        *latency = outputDesc->latency;
361        gLock.unlock();
362    }
363
364    ALOGV("getLatency() output %d, latency %d", output, *latency);
365
366    return NO_ERROR;
367}
368
369status_t AudioSystem::getInputBufferSize(uint32_t sampleRate, audio_format_t format,
370        audio_channel_mask_t channelMask, size_t* buffSize)
371{
372    gLock.lock();
373    // Do we have a stale gInBufferSize or are we requesting the input buffer size for new values
374    size_t inBuffSize = gInBuffSize;
375    if ((inBuffSize == 0) || (sampleRate != gPrevInSamplingRate) || (format != gPrevInFormat)
376        || (channelMask != gPrevInChannelMask)) {
377        gLock.unlock();
378        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
379        if (af == 0) {
380            return PERMISSION_DENIED;
381        }
382        inBuffSize = af->getInputBufferSize(sampleRate, format, channelMask);
383        if (inBuffSize == 0) {
384            ALOGE("AudioSystem::getInputBufferSize failed sampleRate %d format %#x channelMask %x",
385                    sampleRate, format, channelMask);
386            return BAD_VALUE;
387        }
388        // A benign race is possible here: we could overwrite a fresher cache entry
389        gLock.lock();
390        // save the request params
391        gPrevInSamplingRate = sampleRate;
392        gPrevInFormat = format;
393        gPrevInChannelMask = channelMask;
394
395        gInBuffSize = inBuffSize;
396    }
397    gLock.unlock();
398    *buffSize = inBuffSize;
399
400    return NO_ERROR;
401}
402
403status_t AudioSystem::setVoiceVolume(float value)
404{
405    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
406    if (af == 0) return PERMISSION_DENIED;
407    return af->setVoiceVolume(value);
408}
409
410status_t AudioSystem::getRenderPosition(audio_io_handle_t output, uint32_t *halFrames,
411                                        uint32_t *dspFrames)
412{
413    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
414    if (af == 0) return PERMISSION_DENIED;
415
416    return af->getRenderPosition(halFrames, dspFrames, output);
417}
418
419uint32_t AudioSystem::getInputFramesLost(audio_io_handle_t ioHandle)
420{
421    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
422    uint32_t result = 0;
423    if (af == 0) return result;
424    if (ioHandle == AUDIO_IO_HANDLE_NONE) return result;
425
426    result = af->getInputFramesLost(ioHandle);
427    return result;
428}
429
430int AudioSystem::newAudioSessionId()
431{
432    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
433    if (af == 0) return AUDIO_SESSION_ALLOCATE;
434    return af->newAudioSessionId();
435}
436
437void AudioSystem::acquireAudioSessionId(int audioSession, pid_t pid)
438{
439    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
440    if (af != 0) {
441        af->acquireAudioSessionId(audioSession, pid);
442    }
443}
444
445void AudioSystem::releaseAudioSessionId(int audioSession, pid_t pid)
446{
447    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
448    if (af != 0) {
449        af->releaseAudioSessionId(audioSession, pid);
450    }
451}
452
453// ---------------------------------------------------------------------------
454
455void AudioSystem::AudioFlingerClient::binderDied(const wp<IBinder>& who __unused)
456{
457    Mutex::Autolock _l(AudioSystem::gLock);
458
459    AudioSystem::gAudioFlinger.clear();
460    // clear output handles and stream to output map caches
461    AudioSystem::gOutputs.clear();
462
463    if (gAudioErrorCallback) {
464        gAudioErrorCallback(DEAD_OBJECT);
465    }
466    ALOGW("AudioFlinger server died!");
467}
468
469void AudioSystem::AudioFlingerClient::ioConfigChanged(int event, audio_io_handle_t ioHandle,
470        const void *param2) {
471    ALOGV("ioConfigChanged() event %d", event);
472    const OutputDescriptor *desc;
473    audio_stream_type_t stream;
474
475    if (ioHandle == AUDIO_IO_HANDLE_NONE) return;
476
477    Mutex::Autolock _l(AudioSystem::gLock);
478
479    switch (event) {
480    case STREAM_CONFIG_CHANGED:
481        break;
482    case OUTPUT_OPENED: {
483        if (gOutputs.indexOfKey(ioHandle) >= 0) {
484            ALOGV("ioConfigChanged() opening already existing output! %d", ioHandle);
485            break;
486        }
487        if (param2 == NULL) break;
488        desc = (const OutputDescriptor *)param2;
489
490        OutputDescriptor *outputDesc =  new OutputDescriptor(*desc);
491        gOutputs.add(ioHandle, outputDesc);
492        ALOGV("ioConfigChanged() new output samplingRate %u, format %#x channel mask %#x frameCount %zu "
493                "latency %d",
494                outputDesc->samplingRate, outputDesc->format, outputDesc->channelMask,
495                outputDesc->frameCount, outputDesc->latency);
496        } break;
497    case OUTPUT_CLOSED: {
498        if (gOutputs.indexOfKey(ioHandle) < 0) {
499            ALOGW("ioConfigChanged() closing unknown output! %d", ioHandle);
500            break;
501        }
502        ALOGV("ioConfigChanged() output %d closed", ioHandle);
503
504        gOutputs.removeItem(ioHandle);
505        } break;
506
507    case OUTPUT_CONFIG_CHANGED: {
508        int index = gOutputs.indexOfKey(ioHandle);
509        if (index < 0) {
510            ALOGW("ioConfigChanged() modifying unknown output! %d", ioHandle);
511            break;
512        }
513        if (param2 == NULL) break;
514        desc = (const OutputDescriptor *)param2;
515
516        ALOGV("ioConfigChanged() new config for output %d samplingRate %u, format %#x channel mask %#x "
517                "frameCount %zu latency %d",
518                ioHandle, desc->samplingRate, desc->format,
519                desc->channelMask, desc->frameCount, desc->latency);
520        OutputDescriptor *outputDesc = gOutputs.valueAt(index);
521        delete outputDesc;
522        outputDesc =  new OutputDescriptor(*desc);
523        gOutputs.replaceValueFor(ioHandle, outputDesc);
524    } break;
525    case INPUT_OPENED:
526    case INPUT_CLOSED:
527    case INPUT_CONFIG_CHANGED:
528        break;
529
530    }
531}
532
533void AudioSystem::setErrorCallback(audio_error_callback cb)
534{
535    Mutex::Autolock _l(gLock);
536    gAudioErrorCallback = cb;
537}
538
539
540bool AudioSystem::routedToA2dpOutput(audio_stream_type_t streamType)
541{
542    switch (streamType) {
543    case AUDIO_STREAM_MUSIC:
544    case AUDIO_STREAM_VOICE_CALL:
545    case AUDIO_STREAM_BLUETOOTH_SCO:
546    case AUDIO_STREAM_SYSTEM:
547        return true;
548    default:
549        return false;
550    }
551}
552
553
554// client singleton for AudioPolicyService binder interface
555sp<IAudioPolicyService> AudioSystem::gAudioPolicyService;
556sp<AudioSystem::AudioPolicyServiceClient> AudioSystem::gAudioPolicyServiceClient;
557
558
559// establish binder interface to AudioPolicy service
560const sp<IAudioPolicyService>& AudioSystem::get_audio_policy_service()
561{
562    gLock.lock();
563    if (gAudioPolicyService == 0) {
564        sp<IServiceManager> sm = defaultServiceManager();
565        sp<IBinder> binder;
566        do {
567            binder = sm->getService(String16("media.audio_policy"));
568            if (binder != 0)
569                break;
570            ALOGW("AudioPolicyService not published, waiting...");
571            usleep(500000); // 0.5 s
572        } while (true);
573        if (gAudioPolicyServiceClient == NULL) {
574            gAudioPolicyServiceClient = new AudioPolicyServiceClient();
575        }
576        binder->linkToDeath(gAudioPolicyServiceClient);
577        gAudioPolicyService = interface_cast<IAudioPolicyService>(binder);
578        gAudioPolicyService->registerClient(gAudioPolicyServiceClient);
579        gLock.unlock();
580    } else {
581        gLock.unlock();
582    }
583    return gAudioPolicyService;
584}
585
586// ---------------------------------------------------------------------------
587
588status_t AudioSystem::setDeviceConnectionState(audio_devices_t device,
589                                               audio_policy_dev_state_t state,
590                                               const char *device_address)
591{
592    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
593    const char *address = "";
594
595    if (aps == 0) return PERMISSION_DENIED;
596
597    if (device_address != NULL) {
598        address = device_address;
599    }
600
601    return aps->setDeviceConnectionState(device, state, address);
602}
603
604audio_policy_dev_state_t AudioSystem::getDeviceConnectionState(audio_devices_t device,
605                                                  const char *device_address)
606{
607    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
608    if (aps == 0) return AUDIO_POLICY_DEVICE_STATE_UNAVAILABLE;
609
610    return aps->getDeviceConnectionState(device, device_address);
611}
612
613status_t AudioSystem::setPhoneState(audio_mode_t state)
614{
615    if (uint32_t(state) >= AUDIO_MODE_CNT) return BAD_VALUE;
616    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
617    if (aps == 0) return PERMISSION_DENIED;
618
619    return aps->setPhoneState(state);
620}
621
622status_t AudioSystem::setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config)
623{
624    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
625    if (aps == 0) return PERMISSION_DENIED;
626    return aps->setForceUse(usage, config);
627}
628
629audio_policy_forced_cfg_t AudioSystem::getForceUse(audio_policy_force_use_t usage)
630{
631    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
632    if (aps == 0) return AUDIO_POLICY_FORCE_NONE;
633    return aps->getForceUse(usage);
634}
635
636
637audio_io_handle_t AudioSystem::getOutput(audio_stream_type_t stream,
638                                    uint32_t samplingRate,
639                                    audio_format_t format,
640                                    audio_channel_mask_t channelMask,
641                                    audio_output_flags_t flags,
642                                    const audio_offload_info_t *offloadInfo)
643{
644    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
645    if (aps == 0) return 0;
646    return aps->getOutput(stream, samplingRate, format, channelMask, flags, offloadInfo);
647}
648
649audio_io_handle_t AudioSystem::getOutputForAttr(const audio_attributes_t *attr,
650                                    uint32_t samplingRate,
651                                    audio_format_t format,
652                                    audio_channel_mask_t channelMask,
653                                    audio_output_flags_t flags,
654                                    const audio_offload_info_t *offloadInfo)
655{
656    if (attr == NULL) return 0;
657    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
658    if (aps == 0) return 0;
659    return aps->getOutputForAttr(attr, samplingRate, format, channelMask, flags, offloadInfo);
660}
661
662status_t AudioSystem::startOutput(audio_io_handle_t output,
663                                  audio_stream_type_t stream,
664                                  int session)
665{
666    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
667    if (aps == 0) return PERMISSION_DENIED;
668    return aps->startOutput(output, stream, session);
669}
670
671status_t AudioSystem::stopOutput(audio_io_handle_t output,
672                                 audio_stream_type_t stream,
673                                 int session)
674{
675    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
676    if (aps == 0) return PERMISSION_DENIED;
677    return aps->stopOutput(output, stream, session);
678}
679
680void AudioSystem::releaseOutput(audio_io_handle_t output)
681{
682    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
683    if (aps == 0) return;
684    aps->releaseOutput(output);
685}
686
687audio_io_handle_t AudioSystem::getInput(audio_source_t inputSource,
688                                    uint32_t samplingRate,
689                                    audio_format_t format,
690                                    audio_channel_mask_t channelMask,
691                                    int sessionId)
692{
693    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
694    if (aps == 0) return 0;
695    return aps->getInput(inputSource, samplingRate, format, channelMask, sessionId);
696}
697
698status_t AudioSystem::startInput(audio_io_handle_t input)
699{
700    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
701    if (aps == 0) return PERMISSION_DENIED;
702    return aps->startInput(input);
703}
704
705status_t AudioSystem::stopInput(audio_io_handle_t input)
706{
707    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
708    if (aps == 0) return PERMISSION_DENIED;
709    return aps->stopInput(input);
710}
711
712void AudioSystem::releaseInput(audio_io_handle_t input)
713{
714    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
715    if (aps == 0) return;
716    aps->releaseInput(input);
717}
718
719status_t AudioSystem::initStreamVolume(audio_stream_type_t stream,
720                                    int indexMin,
721                                    int indexMax)
722{
723    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
724    if (aps == 0) return PERMISSION_DENIED;
725    return aps->initStreamVolume(stream, indexMin, indexMax);
726}
727
728status_t AudioSystem::setStreamVolumeIndex(audio_stream_type_t stream,
729                                           int index,
730                                           audio_devices_t device)
731{
732    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
733    if (aps == 0) return PERMISSION_DENIED;
734    return aps->setStreamVolumeIndex(stream, index, device);
735}
736
737status_t AudioSystem::getStreamVolumeIndex(audio_stream_type_t stream,
738                                           int *index,
739                                           audio_devices_t device)
740{
741    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
742    if (aps == 0) return PERMISSION_DENIED;
743    return aps->getStreamVolumeIndex(stream, index, device);
744}
745
746uint32_t AudioSystem::getStrategyForStream(audio_stream_type_t stream)
747{
748    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
749    if (aps == 0) return 0;
750    return aps->getStrategyForStream(stream);
751}
752
753audio_devices_t AudioSystem::getDevicesForStream(audio_stream_type_t stream)
754{
755    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
756    if (aps == 0) return AUDIO_DEVICE_NONE;
757    return aps->getDevicesForStream(stream);
758}
759
760audio_io_handle_t AudioSystem::getOutputForEffect(const effect_descriptor_t *desc)
761{
762    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
763    // FIXME change return type to status_t, and return PERMISSION_DENIED here
764    if (aps == 0) return AUDIO_IO_HANDLE_NONE;
765    return aps->getOutputForEffect(desc);
766}
767
768status_t AudioSystem::registerEffect(const effect_descriptor_t *desc,
769                                audio_io_handle_t io,
770                                uint32_t strategy,
771                                int session,
772                                int id)
773{
774    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
775    if (aps == 0) return PERMISSION_DENIED;
776    return aps->registerEffect(desc, io, strategy, session, id);
777}
778
779status_t AudioSystem::unregisterEffect(int id)
780{
781    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
782    if (aps == 0) return PERMISSION_DENIED;
783    return aps->unregisterEffect(id);
784}
785
786status_t AudioSystem::setEffectEnabled(int id, bool enabled)
787{
788    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
789    if (aps == 0) return PERMISSION_DENIED;
790    return aps->setEffectEnabled(id, enabled);
791}
792
793status_t AudioSystem::isStreamActive(audio_stream_type_t stream, bool* state, uint32_t inPastMs)
794{
795    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
796    if (aps == 0) return PERMISSION_DENIED;
797    if (state == NULL) return BAD_VALUE;
798    *state = aps->isStreamActive(stream, inPastMs);
799    return NO_ERROR;
800}
801
802status_t AudioSystem::isStreamActiveRemotely(audio_stream_type_t stream, bool* state,
803        uint32_t inPastMs)
804{
805    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
806    if (aps == 0) return PERMISSION_DENIED;
807    if (state == NULL) return BAD_VALUE;
808    *state = aps->isStreamActiveRemotely(stream, inPastMs);
809    return NO_ERROR;
810}
811
812status_t AudioSystem::isSourceActive(audio_source_t stream, bool* state)
813{
814    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
815    if (aps == 0) return PERMISSION_DENIED;
816    if (state == NULL) return BAD_VALUE;
817    *state = aps->isSourceActive(stream);
818    return NO_ERROR;
819}
820
821uint32_t AudioSystem::getPrimaryOutputSamplingRate()
822{
823    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
824    if (af == 0) return 0;
825    return af->getPrimaryOutputSamplingRate();
826}
827
828size_t AudioSystem::getPrimaryOutputFrameCount()
829{
830    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
831    if (af == 0) return 0;
832    return af->getPrimaryOutputFrameCount();
833}
834
835status_t AudioSystem::setLowRamDevice(bool isLowRamDevice)
836{
837    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
838    if (af == 0) return PERMISSION_DENIED;
839    return af->setLowRamDevice(isLowRamDevice);
840}
841
842void AudioSystem::clearAudioConfigCache()
843{
844    Mutex::Autolock _l(gLock);
845    ALOGV("clearAudioConfigCache()");
846    gOutputs.clear();
847}
848
849bool AudioSystem::isOffloadSupported(const audio_offload_info_t& info)
850{
851    ALOGV("isOffloadSupported()");
852    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
853    if (aps == 0) return false;
854    return aps->isOffloadSupported(info);
855}
856
857status_t AudioSystem::listAudioPorts(audio_port_role_t role,
858                                     audio_port_type_t type,
859                                     unsigned int *num_ports,
860                                     struct audio_port *ports,
861                                     unsigned int *generation)
862{
863    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
864    if (aps == 0) return PERMISSION_DENIED;
865    return aps->listAudioPorts(role, type, num_ports, ports, generation);
866}
867
868status_t AudioSystem::getAudioPort(struct audio_port *port)
869{
870    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
871    if (aps == 0) return PERMISSION_DENIED;
872    return aps->getAudioPort(port);
873}
874
875status_t AudioSystem::createAudioPatch(const struct audio_patch *patch,
876                                   audio_patch_handle_t *handle)
877{
878    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
879    if (aps == 0) return PERMISSION_DENIED;
880    return aps->createAudioPatch(patch, handle);
881}
882
883status_t AudioSystem::releaseAudioPatch(audio_patch_handle_t handle)
884{
885    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
886    if (aps == 0) return PERMISSION_DENIED;
887    return aps->releaseAudioPatch(handle);
888}
889
890status_t AudioSystem::listAudioPatches(unsigned int *num_patches,
891                                  struct audio_patch *patches,
892                                  unsigned int *generation)
893{
894    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
895    if (aps == 0) return PERMISSION_DENIED;
896    return aps->listAudioPatches(num_patches, patches, generation);
897}
898
899status_t AudioSystem::setAudioPortConfig(const struct audio_port_config *config)
900{
901    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
902    if (aps == 0) return PERMISSION_DENIED;
903    return aps->setAudioPortConfig(config);
904}
905
906void AudioSystem::setAudioPortCallback(sp<AudioPortCallback> callBack)
907{
908    Mutex::Autolock _l(gLock);
909    gAudioPortCallback = callBack;
910}
911
912// ---------------------------------------------------------------------------
913
914void AudioSystem::AudioPolicyServiceClient::binderDied(const wp<IBinder>& who __unused)
915{
916    Mutex::Autolock _l(gLock);
917    if (gAudioPortCallback != 0) {
918        gAudioPortCallback->onServiceDied();
919    }
920    AudioSystem::gAudioPolicyService.clear();
921
922    ALOGW("AudioPolicyService server died!");
923}
924
925void AudioSystem::AudioPolicyServiceClient::onAudioPortListUpdate()
926{
927    Mutex::Autolock _l(gLock);
928    if (gAudioPortCallback != 0) {
929        gAudioPortCallback->onAudioPortListUpdate();
930    }
931}
932
933void AudioSystem::AudioPolicyServiceClient::onAudioPatchListUpdate()
934{
935    Mutex::Autolock _l(gLock);
936    if (gAudioPortCallback != 0) {
937        gAudioPortCallback->onAudioPatchListUpdate();
938    }
939}
940
941}; // namespace android
942