AudioSystem.cpp revision fc499ca2babff1315d0188ddfbe0268fe5d5e8ae 
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// ----------------------------------------------------------------------------
27// the sim build doesn't have gettid
28
29#ifndef HAVE_GETTID
30# define gettid getpid
31#endif
32
33// ----------------------------------------------------------------------------
34
35namespace android {
36
37// client singleton for AudioFlinger binder interface
38Mutex AudioSystem::gLock;
39sp<IAudioFlinger> AudioSystem::gAudioFlinger;
40sp<AudioSystem::AudioFlingerClient> AudioSystem::gAudioFlingerClient;
41audio_error_callback AudioSystem::gAudioErrorCallback = NULL;
42// Cached values
43DefaultKeyedVector<int, audio_io_handle_t> AudioSystem::gStreamOutputMap(0);
44DefaultKeyedVector<audio_io_handle_t, AudioSystem::OutputDescriptor *> AudioSystem::gOutputs(0);
45
46// Cached values for recording queries
47uint32_t AudioSystem::gPrevInSamplingRate = 16000;
48int AudioSystem::gPrevInFormat = AudioSystem::PCM_16_BIT;
49int AudioSystem::gPrevInChannelCount = 1;
50size_t AudioSystem::gInBuffSize = 0;
51
52
53// establish binder interface to AudioFlinger service
54const sp<IAudioFlinger>& AudioSystem::get_audio_flinger()
55{
56    Mutex::Autolock _l(gLock);
57    if (gAudioFlinger.get() == 0) {
58        sp<IServiceManager> sm = defaultServiceManager();
59        sp<IBinder> binder;
60        do {
61            binder = sm->getService(String16("media.audio_flinger"));
62            if (binder != 0)
63                break;
64            LOGW("AudioFlinger not published, waiting...");
65            usleep(500000); // 0.5 s
66        } while(true);
67        if (gAudioFlingerClient == NULL) {
68            gAudioFlingerClient = new AudioFlingerClient();
69        } else {
70            if (gAudioErrorCallback) {
71                gAudioErrorCallback(NO_ERROR);
72            }
73         }
74        binder->linkToDeath(gAudioFlingerClient);
75        gAudioFlinger = interface_cast<IAudioFlinger>(binder);
76        gAudioFlinger->registerClient(gAudioFlingerClient);
77    }
78    LOGE_IF(gAudioFlinger==0, "no AudioFlinger!?");
79
80    return gAudioFlinger;
81}
82
83status_t AudioSystem::muteMicrophone(bool state) {
84    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
85    if (af == 0) return PERMISSION_DENIED;
86    return af->setMicMute(state);
87}
88
89status_t AudioSystem::isMicrophoneMuted(bool* state) {
90    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
91    if (af == 0) return PERMISSION_DENIED;
92    *state = af->getMicMute();
93    return NO_ERROR;
94}
95
96status_t AudioSystem::setMasterVolume(float value)
97{
98    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
99    if (af == 0) return PERMISSION_DENIED;
100    af->setMasterVolume(value);
101    return NO_ERROR;
102}
103
104status_t AudioSystem::setMasterMute(bool mute)
105{
106    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
107    if (af == 0) return PERMISSION_DENIED;
108    af->setMasterMute(mute);
109    return NO_ERROR;
110}
111
112status_t AudioSystem::getMasterVolume(float* volume)
113{
114    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
115    if (af == 0) return PERMISSION_DENIED;
116    *volume = af->masterVolume();
117    return NO_ERROR;
118}
119
120status_t AudioSystem::getMasterMute(bool* mute)
121{
122    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
123    if (af == 0) return PERMISSION_DENIED;
124    *mute = af->masterMute();
125    return NO_ERROR;
126}
127
128status_t AudioSystem::setStreamVolume(int stream, float value, int output)
129{
130    if (uint32_t(stream) >= NUM_STREAM_TYPES) return BAD_VALUE;
131    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
132    if (af == 0) return PERMISSION_DENIED;
133    af->setStreamVolume(stream, value, output);
134    return NO_ERROR;
135}
136
137status_t AudioSystem::setStreamMute(int stream, bool mute)
138{
139    if (uint32_t(stream) >= NUM_STREAM_TYPES) return BAD_VALUE;
140    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
141    if (af == 0) return PERMISSION_DENIED;
142    af->setStreamMute(stream, mute);
143    return NO_ERROR;
144}
145
146status_t AudioSystem::getStreamVolume(int stream, float* volume, int output)
147{
148    if (uint32_t(stream) >= NUM_STREAM_TYPES) return BAD_VALUE;
149    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
150    if (af == 0) return PERMISSION_DENIED;
151    *volume = af->streamVolume(stream, output);
152    return NO_ERROR;
153}
154
155status_t AudioSystem::getStreamMute(int stream, bool* mute)
156{
157    if (uint32_t(stream) >= NUM_STREAM_TYPES) return BAD_VALUE;
158    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
159    if (af == 0) return PERMISSION_DENIED;
160    *mute = af->streamMute(stream);
161    return NO_ERROR;
162}
163
164status_t AudioSystem::setMode(int mode)
165{
166    if (mode >= NUM_MODES) return BAD_VALUE;
167    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
168    if (af == 0) return PERMISSION_DENIED;
169    return af->setMode(mode);
170}
171
172
173status_t AudioSystem::isStreamActive(int stream, bool* state) {
174    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
175    if (af == 0) return PERMISSION_DENIED;
176    *state = af->isStreamActive(stream);
177    return NO_ERROR;
178}
179
180
181status_t AudioSystem::setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs) {
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    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
189    String8 result = String8("");
190    if (af == 0) return result;
191
192    result = af->getParameters(ioHandle, keys);
193    return result;
194}
195
196// convert volume steps to natural log scale
197
198// change this value to change volume scaling
199static const float dBPerStep = 0.5f;
200// shouldn't need to touch these
201static const float dBConvert = -dBPerStep * 2.302585093f / 20.0f;
202static const float dBConvertInverse = 1.0f / dBConvert;
203
204float AudioSystem::linearToLog(int volume)
205{
206    // float v = volume ? exp(float(100 - volume) * dBConvert) : 0;
207    // LOGD("linearToLog(%d)=%f", volume, v);
208    // return v;
209    return volume ? exp(float(100 - volume) * dBConvert) : 0;
210}
211
212int AudioSystem::logToLinear(float volume)
213{
214    // int v = volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
215    // LOGD("logTolinear(%d)=%f", v, volume);
216    // return v;
217    return volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
218}
219
220status_t AudioSystem::getOutputSamplingRate(int* samplingRate, int streamType)
221{
222    OutputDescriptor *outputDesc;
223    audio_io_handle_t output;
224
225    if (streamType == DEFAULT) {
226        streamType = MUSIC;
227    }
228
229    output = getOutput((stream_type)streamType);
230    if (output == 0) {
231        return PERMISSION_DENIED;
232    }
233
234    gLock.lock();
235    outputDesc = AudioSystem::gOutputs.valueFor(output);
236    if (outputDesc == 0) {
237        LOGV("getOutputSamplingRate() no output descriptor for output %d in gOutputs", output);
238        gLock.unlock();
239        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
240        if (af == 0) return PERMISSION_DENIED;
241        *samplingRate = af->sampleRate(output);
242    } else {
243        LOGV("getOutputSamplingRate() reading from output desc");
244        *samplingRate = outputDesc->samplingRate;
245        gLock.unlock();
246    }
247
248    LOGV("getOutputSamplingRate() streamType %d, output %d, sampling rate %d", streamType, output, *samplingRate);
249
250    return NO_ERROR;
251}
252
253status_t AudioSystem::getOutputFrameCount(int* frameCount, int streamType)
254{
255    OutputDescriptor *outputDesc;
256    audio_io_handle_t output;
257
258    if (streamType == DEFAULT) {
259        streamType = MUSIC;
260    }
261
262    output = getOutput((stream_type)streamType);
263    if (output == 0) {
264        return PERMISSION_DENIED;
265    }
266
267    gLock.lock();
268    outputDesc = AudioSystem::gOutputs.valueFor(output);
269    if (outputDesc == 0) {
270        gLock.unlock();
271        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
272        if (af == 0) return PERMISSION_DENIED;
273        *frameCount = af->frameCount(output);
274    } else {
275        *frameCount = outputDesc->frameCount;
276        gLock.unlock();
277    }
278
279    LOGV("getOutputFrameCount() streamType %d, output %d, frameCount %d", streamType, output, *frameCount);
280
281    return NO_ERROR;
282}
283
284status_t AudioSystem::getOutputLatency(uint32_t* latency, int streamType)
285{
286    OutputDescriptor *outputDesc;
287    audio_io_handle_t output;
288
289    if (streamType == DEFAULT) {
290        streamType = MUSIC;
291    }
292
293    output = getOutput((stream_type)streamType);
294    if (output == 0) {
295        return PERMISSION_DENIED;
296    }
297
298    gLock.lock();
299    outputDesc = AudioSystem::gOutputs.valueFor(output);
300    if (outputDesc == 0) {
301        gLock.unlock();
302        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
303        if (af == 0) return PERMISSION_DENIED;
304        *latency = af->latency(output);
305    } else {
306        *latency = outputDesc->latency;
307        gLock.unlock();
308    }
309
310    LOGV("getOutputLatency() streamType %d, output %d, latency %d", streamType, output, *latency);
311
312    return NO_ERROR;
313}
314
315status_t AudioSystem::getInputBufferSize(uint32_t sampleRate, int format, int channelCount,
316    size_t* buffSize)
317{
318    // Do we have a stale gInBufferSize or are we requesting the input buffer size for new values
319    if ((gInBuffSize == 0) || (sampleRate != gPrevInSamplingRate) || (format != gPrevInFormat)
320        || (channelCount != gPrevInChannelCount)) {
321        // save the request params
322        gPrevInSamplingRate = sampleRate;
323        gPrevInFormat = format;
324        gPrevInChannelCount = channelCount;
325
326        gInBuffSize = 0;
327        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
328        if (af == 0) {
329            return PERMISSION_DENIED;
330        }
331        gInBuffSize = af->getInputBufferSize(sampleRate, format, channelCount);
332    }
333    *buffSize = gInBuffSize;
334
335    return NO_ERROR;
336}
337
338status_t AudioSystem::setVoiceVolume(float value)
339{
340    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
341    if (af == 0) return PERMISSION_DENIED;
342    return af->setVoiceVolume(value);
343}
344
345status_t AudioSystem::getRenderPosition(uint32_t *halFrames, uint32_t *dspFrames, int stream)
346{
347    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
348    if (af == 0) return PERMISSION_DENIED;
349
350    if (stream == DEFAULT) {
351        stream = MUSIC;
352    }
353
354    return af->getRenderPosition(halFrames, dspFrames, getOutput((stream_type)stream));
355}
356
357unsigned int AudioSystem::getInputFramesLost(audio_io_handle_t ioHandle) {
358    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
359    unsigned int result = 0;
360    if (af == 0) return result;
361    if (ioHandle == 0) return result;
362
363    result = af->getInputFramesLost(ioHandle);
364    return result;
365}
366
367int AudioSystem::newAudioSessionId() {
368    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
369    if (af == 0) return 0;
370    return af->newAudioSessionId();
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 MUSIC:
468    case VOICE_CALL:
469    case BLUETOOTH_SCO:
470    case 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 device,
510                                                  device_connection_state 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
519AudioSystem::device_connection_state AudioSystem::getDeviceConnectionState(audio_devices device,
520                                                  const char *device_address)
521{
522    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
523    if (aps == 0) return 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(force_use usage, forced_config 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
550AudioSystem::forced_config AudioSystem::getForceUse(force_use usage)
551{
552    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
553    if (aps == 0) return FORCE_NONE;
554    return aps->getForceUse(usage);
555}
556
557
558audio_io_handle_t AudioSystem::getOutput(stream_type stream,
559                                    uint32_t samplingRate,
560                                    uint32_t format,
561                                    uint32_t channels,
562                                    output_flags 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 & AudioSystem::OUTPUT_FLAG_DIRECT) == 0 &&
574        ((stream != AudioSystem::VOICE_CALL && stream != AudioSystem::BLUETOOTH_SCO) ||
575         channels != AudioSystem::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 & AudioSystem::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, AudioSystem::stream_type stream)
594{
595    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
596    if (aps == 0) return PERMISSION_DENIED;
597    return aps->startOutput(output, stream);
598}
599
600status_t AudioSystem::stopOutput(audio_io_handle_t output, AudioSystem::stream_type stream)
601{
602    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
603    if (aps == 0) return PERMISSION_DENIED;
604    return aps->stopOutput(output, stream);
605}
606
607void AudioSystem::releaseOutput(audio_io_handle_t output)
608{
609    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
610    if (aps == 0) return;
611    aps->releaseOutput(output);
612}
613
614audio_io_handle_t AudioSystem::getInput(int inputSource,
615                                    uint32_t samplingRate,
616                                    uint32_t format,
617                                    uint32_t channels,
618                                    audio_in_acoustics acoustics)
619{
620    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
621    if (aps == 0) return 0;
622    return aps->getInput(inputSource, samplingRate, format, channels, acoustics);
623}
624
625status_t AudioSystem::startInput(audio_io_handle_t input)
626{
627    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
628    if (aps == 0) return PERMISSION_DENIED;
629    return aps->startInput(input);
630}
631
632status_t AudioSystem::stopInput(audio_io_handle_t input)
633{
634    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
635    if (aps == 0) return PERMISSION_DENIED;
636    return aps->stopInput(input);
637}
638
639void AudioSystem::releaseInput(audio_io_handle_t input)
640{
641    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
642    if (aps == 0) return;
643    aps->releaseInput(input);
644}
645
646status_t AudioSystem::initStreamVolume(stream_type stream,
647                                    int indexMin,
648                                    int indexMax)
649{
650    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
651    if (aps == 0) return PERMISSION_DENIED;
652    return aps->initStreamVolume(stream, indexMin, indexMax);
653}
654
655status_t AudioSystem::setStreamVolumeIndex(stream_type stream, int index)
656{
657    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
658    if (aps == 0) return PERMISSION_DENIED;
659    return aps->setStreamVolumeIndex(stream, index);
660}
661
662status_t AudioSystem::getStreamVolumeIndex(stream_type stream, int *index)
663{
664    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
665    if (aps == 0) return PERMISSION_DENIED;
666    return aps->getStreamVolumeIndex(stream, index);
667}
668
669// ---------------------------------------------------------------------------
670
671void AudioSystem::AudioPolicyServiceClient::binderDied(const wp<IBinder>& who) {
672    Mutex::Autolock _l(AudioSystem::gLock);
673    AudioSystem::gAudioPolicyService.clear();
674
675    LOGW("AudioPolicyService server died!");
676}
677
678// ---------------------------------------------------------------------------
679
680
681// use emulated popcount optimization
682// http://www.df.lth.se/~john_e/gems/gem002d.html
683uint32_t AudioSystem::popCount(uint32_t u)
684{
685    u = ((u&0x55555555) + ((u>>1)&0x55555555));
686    u = ((u&0x33333333) + ((u>>2)&0x33333333));
687    u = ((u&0x0f0f0f0f) + ((u>>4)&0x0f0f0f0f));
688    u = ((u&0x00ff00ff) + ((u>>8)&0x00ff00ff));
689    u = ( u&0x0000ffff) + (u>>16);
690    return u;
691}
692
693bool AudioSystem::isOutputDevice(audio_devices device)
694{
695    if ((popCount(device) == 1 ) &&
696        ((device & ~AudioSystem::DEVICE_OUT_ALL) == 0)) {
697        return true;
698    } else {
699        return false;
700    }
701}
702
703bool AudioSystem::isInputDevice(audio_devices device)
704{
705    if ((popCount(device) == 1 ) &&
706        ((device & ~AudioSystem::DEVICE_IN_ALL) == 0)) {
707        return true;
708    } else {
709        return false;
710    }
711}
712
713bool AudioSystem::isA2dpDevice(audio_devices device)
714{
715    if ((popCount(device) == 1 ) &&
716        (device & (AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP |
717                   AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES |
718                   AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER))) {
719        return true;
720    } else {
721        return false;
722    }
723}
724
725bool AudioSystem::isBluetoothScoDevice(audio_devices device)
726{
727    if ((popCount(device) == 1 ) &&
728        (device & (AudioSystem::DEVICE_OUT_BLUETOOTH_SCO |
729                   AudioSystem::DEVICE_OUT_BLUETOOTH_SCO_HEADSET |
730                   AudioSystem::DEVICE_OUT_BLUETOOTH_SCO_CARKIT |
731                   AudioSystem::DEVICE_IN_BLUETOOTH_SCO_HEADSET))) {
732        return true;
733    } else {
734        return false;
735    }
736}
737
738bool AudioSystem::isLowVisibility(stream_type stream)
739{
740    if (stream == AudioSystem::SYSTEM ||
741        stream == AudioSystem::NOTIFICATION ||
742        stream == AudioSystem::RING) {
743        return true;
744    } else {
745        return false;
746    }
747}
748
749bool AudioSystem::isInputChannel(uint32_t channel)
750{
751    if ((channel & ~AudioSystem::CHANNEL_IN_ALL) == 0) {
752        return true;
753    } else {
754        return false;
755    }
756}
757
758bool AudioSystem::isOutputChannel(uint32_t channel)
759{
760    if ((channel & ~AudioSystem::CHANNEL_OUT_ALL) == 0) {
761        return true;
762    } else {
763        return false;
764    }
765}
766
767bool AudioSystem::isValidFormat(uint32_t format)
768{
769    switch (format & MAIN_FORMAT_MASK) {
770    case         PCM:
771    case         MP3:
772    case         AMR_NB:
773    case         AMR_WB:
774    case         AAC:
775    case         HE_AAC_V1:
776    case         HE_AAC_V2:
777    case         VORBIS:
778        return true;
779    default:
780        return false;
781    }
782}
783
784bool AudioSystem::isLinearPCM(uint32_t format)
785{
786    switch (format) {
787    case         PCM_16_BIT:
788    case         PCM_8_BIT:
789        return true;
790    default:
791        return false;
792    }
793}
794
795//------------------------- AudioParameter class implementation ---------------
796
797const char *AudioParameter::keyRouting = "routing";
798const char *AudioParameter::keySamplingRate = "sampling_rate";
799const char *AudioParameter::keyFormat = "format";
800const char *AudioParameter::keyChannels = "channels";
801const char *AudioParameter::keyFrameCount = "frame_count";
802
803AudioParameter::AudioParameter(const String8& keyValuePairs)
804{
805    char *str = new char[keyValuePairs.length()+1];
806    mKeyValuePairs = keyValuePairs;
807
808    strcpy(str, keyValuePairs.string());
809    char *pair = strtok(str, ";");
810    while (pair != NULL) {
811        if (strlen(pair) != 0) {
812            size_t eqIdx = strcspn(pair, "=");
813            String8 key = String8(pair, eqIdx);
814            String8 value;
815            if (eqIdx == strlen(pair)) {
816                value = String8("");
817            } else {
818                value = String8(pair + eqIdx + 1);
819            }
820            if (mParameters.indexOfKey(key) < 0) {
821                mParameters.add(key, value);
822            } else {
823                mParameters.replaceValueFor(key, value);
824            }
825        } else {
826            LOGV("AudioParameter() cstor empty key value pair");
827        }
828        pair = strtok(NULL, ";");
829    }
830
831    delete[] str;
832}
833
834AudioParameter::~AudioParameter()
835{
836    mParameters.clear();
837}
838
839String8 AudioParameter::toString()
840{
841    String8 str = String8("");
842
843    size_t size = mParameters.size();
844    for (size_t i = 0; i < size; i++) {
845        str += mParameters.keyAt(i);
846        str += "=";
847        str += mParameters.valueAt(i);
848        if (i < (size - 1)) str += ";";
849    }
850    return str;
851}
852
853status_t AudioParameter::add(const String8& key, const String8& value)
854{
855    if (mParameters.indexOfKey(key) < 0) {
856        mParameters.add(key, value);
857        return NO_ERROR;
858    } else {
859        mParameters.replaceValueFor(key, value);
860        return ALREADY_EXISTS;
861    }
862}
863
864status_t AudioParameter::addInt(const String8& key, const int value)
865{
866    char str[12];
867    if (snprintf(str, 12, "%d", value) > 0) {
868        String8 str8 = String8(str);
869        return add(key, str8);
870    } else {
871        return BAD_VALUE;
872    }
873}
874
875status_t AudioParameter::addFloat(const String8& key, const float value)
876{
877    char str[23];
878    if (snprintf(str, 23, "%.10f", value) > 0) {
879        String8 str8 = String8(str);
880        return add(key, str8);
881    } else {
882        return BAD_VALUE;
883    }
884}
885
886status_t AudioParameter::remove(const String8& key)
887{
888    if (mParameters.indexOfKey(key) >= 0) {
889        mParameters.removeItem(key);
890        return NO_ERROR;
891    } else {
892        return BAD_VALUE;
893    }
894}
895
896status_t AudioParameter::get(const String8& key, String8& value)
897{
898    if (mParameters.indexOfKey(key) >= 0) {
899        value = mParameters.valueFor(key);
900        return NO_ERROR;
901    } else {
902        return BAD_VALUE;
903    }
904}
905
906status_t AudioParameter::getInt(const String8& key, int& value)
907{
908    String8 str8;
909    status_t result = get(key, str8);
910    value = 0;
911    if (result == NO_ERROR) {
912        int val;
913        if (sscanf(str8.string(), "%d", &val) == 1) {
914            value = val;
915        } else {
916            result = INVALID_OPERATION;
917        }
918    }
919    return result;
920}
921
922status_t AudioParameter::getFloat(const String8& key, float& value)
923{
924    String8 str8;
925    status_t result = get(key, str8);
926    value = 0;
927    if (result == NO_ERROR) {
928        float val;
929        if (sscanf(str8.string(), "%f", &val) == 1) {
930            value = val;
931        } else {
932            result = INVALID_OPERATION;
933        }
934    }
935    return result;
936}
937
938status_t AudioParameter::getAt(size_t index, String8& key, String8& value)
939{
940    if (mParameters.size() > index) {
941        key = mParameters.keyAt(index);
942        value = mParameters.valueAt(index);
943        return NO_ERROR;
944    } else {
945        return BAD_VALUE;
946    }
947}
948}; // namespace android
949
950