AudioSystem.cpp revision 0ef583f785528ef2785e6149d5964004cd1016b0 
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::isMusicActive(bool* state) {
174    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
175    if (af == 0) return PERMISSION_DENIED;
176    *state = af->isMusicActive();
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
345// ---------------------------------------------------------------------------
346
347void AudioSystem::AudioFlingerClient::binderDied(const wp<IBinder>& who) {
348    Mutex::Autolock _l(AudioSystem::gLock);
349
350    AudioSystem::gAudioFlinger.clear();
351    // clear output handles and stream to output map caches
352    AudioSystem::gStreamOutputMap.clear();
353    AudioSystem::gOutputs.clear();
354
355    if (gAudioErrorCallback) {
356        gAudioErrorCallback(DEAD_OBJECT);
357    }
358    LOGW("AudioFlinger server died!");
359}
360
361void AudioSystem::AudioFlingerClient::ioConfigChanged(int event, int ioHandle, void *param2) {
362    LOGV("ioConfigChanged() event %d", event);
363    OutputDescriptor *desc;
364    uint32_t stream;
365
366    if (ioHandle == 0) return;
367
368    Mutex::Autolock _l(AudioSystem::gLock);
369
370    switch (event) {
371    case STREAM_CONFIG_CHANGED:
372        if (param2 == 0) break;
373        stream = *(uint32_t *)param2;
374        LOGV("ioConfigChanged() STREAM_CONFIG_CHANGED stream %d, output %d", stream, ioHandle);
375        if (gStreamOutputMap.indexOfKey(stream) >= 0) {
376            gStreamOutputMap.replaceValueFor(stream, ioHandle);
377        }
378        break;
379    case OUTPUT_OPENED: {
380        if (gOutputs.indexOfKey(ioHandle) >= 0) {
381            LOGV("ioConfigChanged() opening already existing output! %d", ioHandle);
382            break;
383        }
384        if (param2 == 0) break;
385        desc = (OutputDescriptor *)param2;
386
387        OutputDescriptor *outputDesc =  new OutputDescriptor(*desc);
388        gOutputs.add(ioHandle, outputDesc);
389        LOGV("ioConfigChanged() new output samplingRate %d, format %d channels %d frameCount %d latency %d",
390                outputDesc->samplingRate, outputDesc->format, outputDesc->channels, outputDesc->frameCount, outputDesc->latency);
391        } break;
392    case OUTPUT_CLOSED: {
393        if (gOutputs.indexOfKey(ioHandle) < 0) {
394            LOGW("ioConfigChanged() closing unknow output! %d", ioHandle);
395            break;
396        }
397        LOGV("ioConfigChanged() output %d closed", ioHandle);
398
399        gOutputs.removeItem(ioHandle);
400        for (int i = gStreamOutputMap.size() - 1; i >= 0 ; i--) {
401            if (gStreamOutputMap.valueAt(i) == ioHandle) {
402                gStreamOutputMap.removeItemsAt(i);
403            }
404        }
405        } break;
406
407    case OUTPUT_CONFIG_CHANGED: {
408        int index = gOutputs.indexOfKey(ioHandle);
409        if (index < 0) {
410            LOGW("ioConfigChanged() modifying unknow output! %d", ioHandle);
411            break;
412        }
413        if (param2 == 0) break;
414        desc = (OutputDescriptor *)param2;
415
416        LOGV("ioConfigChanged() new config for output %d samplingRate %d, format %d channels %d frameCount %d latency %d",
417                ioHandle, desc->samplingRate, desc->format,
418                desc->channels, desc->frameCount, desc->latency);
419        OutputDescriptor *outputDesc = gOutputs.valueAt(index);
420        delete outputDesc;
421        outputDesc =  new OutputDescriptor(*desc);
422        gOutputs.replaceValueFor(ioHandle, outputDesc);
423    } break;
424    case INPUT_OPENED:
425    case INPUT_CLOSED:
426    case INPUT_CONFIG_CHANGED:
427        break;
428
429    }
430}
431
432void AudioSystem::setErrorCallback(audio_error_callback cb) {
433    Mutex::Autolock _l(gLock);
434    gAudioErrorCallback = cb;
435}
436
437bool AudioSystem::routedToA2dpOutput(int streamType) {
438    switch(streamType) {
439    case MUSIC:
440    case VOICE_CALL:
441    case BLUETOOTH_SCO:
442    case SYSTEM:
443        return true;
444    default:
445        return false;
446    }
447}
448
449
450// client singleton for AudioPolicyService binder interface
451sp<IAudioPolicyService> AudioSystem::gAudioPolicyService;
452sp<AudioSystem::AudioPolicyServiceClient> AudioSystem::gAudioPolicyServiceClient;
453
454
455// establish binder interface to AudioFlinger service
456const sp<IAudioPolicyService>& AudioSystem::get_audio_policy_service()
457{
458    gLock.lock();
459    if (gAudioPolicyService.get() == 0) {
460        sp<IServiceManager> sm = defaultServiceManager();
461        sp<IBinder> binder;
462        do {
463            binder = sm->getService(String16("media.audio_policy"));
464            if (binder != 0)
465                break;
466            LOGW("AudioPolicyService not published, waiting...");
467            usleep(500000); // 0.5 s
468        } while(true);
469        if (gAudioPolicyServiceClient == NULL) {
470            gAudioPolicyServiceClient = new AudioPolicyServiceClient();
471        }
472        binder->linkToDeath(gAudioPolicyServiceClient);
473        gAudioPolicyService = interface_cast<IAudioPolicyService>(binder);
474        gLock.unlock();
475    } else {
476        gLock.unlock();
477    }
478    return gAudioPolicyService;
479}
480
481status_t AudioSystem::setDeviceConnectionState(audio_devices device,
482                                                  device_connection_state state,
483                                                  const char *device_address)
484{
485    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
486    if (aps == 0) return PERMISSION_DENIED;
487
488    return aps->setDeviceConnectionState(device, state, device_address);
489}
490
491AudioSystem::device_connection_state AudioSystem::getDeviceConnectionState(audio_devices device,
492                                                  const char *device_address)
493{
494    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
495    if (aps == 0) return DEVICE_STATE_UNAVAILABLE;
496
497    return aps->getDeviceConnectionState(device, device_address);
498}
499
500status_t AudioSystem::setPhoneState(int state)
501{
502    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
503    if (aps == 0) return PERMISSION_DENIED;
504
505    return aps->setPhoneState(state);
506}
507
508status_t AudioSystem::setRingerMode(uint32_t mode, uint32_t mask)
509{
510    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
511    if (aps == 0) return PERMISSION_DENIED;
512    return aps->setRingerMode(mode, mask);
513}
514
515status_t AudioSystem::setForceUse(force_use usage, forced_config config)
516{
517    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
518    if (aps == 0) return PERMISSION_DENIED;
519    return aps->setForceUse(usage, config);
520}
521
522AudioSystem::forced_config AudioSystem::getForceUse(force_use usage)
523{
524    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
525    if (aps == 0) return FORCE_NONE;
526    return aps->getForceUse(usage);
527}
528
529
530audio_io_handle_t AudioSystem::getOutput(stream_type stream,
531                                    uint32_t samplingRate,
532                                    uint32_t format,
533                                    uint32_t channels,
534                                    output_flags flags)
535{
536    audio_io_handle_t output = 0;
537    if ((flags & AudioSystem::OUTPUT_FLAG_DIRECT) == 0) {
538        Mutex::Autolock _l(gLock);
539        output = AudioSystem::gStreamOutputMap.valueFor(stream);
540        LOGV_IF((output != 0), "getOutput() read %d from cache for stream %d", output, stream);
541    }
542    if (output == 0) {
543        const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
544        if (aps == 0) return 0;
545        output = aps->getOutput(stream, samplingRate, format, channels, flags);
546        if ((flags & AudioSystem::OUTPUT_FLAG_DIRECT) == 0) {
547            Mutex::Autolock _l(gLock);
548            AudioSystem::gStreamOutputMap.add(stream, output);
549        }
550    }
551    return output;
552}
553
554status_t AudioSystem::startOutput(audio_io_handle_t output, AudioSystem::stream_type stream)
555{
556    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
557    if (aps == 0) return PERMISSION_DENIED;
558    return aps->startOutput(output, stream);
559}
560
561status_t AudioSystem::stopOutput(audio_io_handle_t output, AudioSystem::stream_type stream)
562{
563    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
564    if (aps == 0) return PERMISSION_DENIED;
565    return aps->stopOutput(output, stream);
566}
567
568void AudioSystem::releaseOutput(audio_io_handle_t output)
569{
570    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
571    if (aps == 0) return;
572    aps->releaseOutput(output);
573}
574
575audio_io_handle_t AudioSystem::getInput(int inputSource,
576                                    uint32_t samplingRate,
577                                    uint32_t format,
578                                    uint32_t channels,
579                                    audio_in_acoustics acoustics)
580{
581    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
582    if (aps == 0) return 0;
583    return aps->getInput(inputSource, samplingRate, format, channels, acoustics);
584}
585
586status_t AudioSystem::startInput(audio_io_handle_t input)
587{
588    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
589    if (aps == 0) return PERMISSION_DENIED;
590    return aps->startInput(input);
591}
592
593status_t AudioSystem::stopInput(audio_io_handle_t input)
594{
595    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
596    if (aps == 0) return PERMISSION_DENIED;
597    return aps->stopInput(input);
598}
599
600void AudioSystem::releaseInput(audio_io_handle_t input)
601{
602    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
603    if (aps == 0) return;
604    aps->releaseInput(input);
605}
606
607status_t AudioSystem::initStreamVolume(stream_type stream,
608                                    int indexMin,
609                                    int indexMax)
610{
611    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
612    if (aps == 0) return PERMISSION_DENIED;
613    return aps->initStreamVolume(stream, indexMin, indexMax);
614}
615
616status_t AudioSystem::setStreamVolumeIndex(stream_type stream, int index)
617{
618    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
619    if (aps == 0) return PERMISSION_DENIED;
620    return aps->setStreamVolumeIndex(stream, index);
621}
622
623status_t AudioSystem::getStreamVolumeIndex(stream_type stream, int *index)
624{
625    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
626    if (aps == 0) return PERMISSION_DENIED;
627    return aps->getStreamVolumeIndex(stream, index);
628}
629
630// ---------------------------------------------------------------------------
631
632void AudioSystem::AudioPolicyServiceClient::binderDied(const wp<IBinder>& who) {
633    Mutex::Autolock _l(AudioSystem::gLock);
634    AudioSystem::gAudioPolicyService.clear();
635
636    LOGW("AudioPolicyService server died!");
637}
638
639// ---------------------------------------------------------------------------
640
641
642// use emulated popcount optimization
643// http://www.df.lth.se/~john_e/gems/gem002d.html
644uint32_t AudioSystem::popCount(uint32_t u)
645{
646    u = ((u&0x55555555) + ((u>>1)&0x55555555));
647    u = ((u&0x33333333) + ((u>>2)&0x33333333));
648    u = ((u&0x0f0f0f0f) + ((u>>4)&0x0f0f0f0f));
649    u = ((u&0x00ff00ff) + ((u>>8)&0x00ff00ff));
650    u = ( u&0x0000ffff) + (u>>16);
651    return u;
652}
653
654bool AudioSystem::isOutputDevice(audio_devices device)
655{
656    if ((popCount(device) == 1 ) &&
657        ((device & ~AudioSystem::DEVICE_OUT_ALL) == 0)) {
658        return true;
659    } else {
660        return false;
661    }
662}
663
664bool AudioSystem::isInputDevice(audio_devices device)
665{
666    if ((popCount(device) == 1 ) &&
667        ((device & ~AudioSystem::DEVICE_IN_ALL) == 0)) {
668        return true;
669    } else {
670        return false;
671    }
672}
673
674bool AudioSystem::isA2dpDevice(audio_devices device)
675{
676    if ((popCount(device) == 1 ) &&
677        (device & (AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP |
678                   AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES |
679                   AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER))) {
680        return true;
681    } else {
682        return false;
683    }
684}
685
686bool AudioSystem::isBluetoothScoDevice(audio_devices device)
687{
688    if ((popCount(device) == 1 ) &&
689        (device & (AudioSystem::DEVICE_OUT_BLUETOOTH_SCO |
690                   AudioSystem::DEVICE_OUT_BLUETOOTH_SCO_HEADSET |
691                   AudioSystem::DEVICE_OUT_BLUETOOTH_SCO_CARKIT))) {
692        return true;
693    } else {
694        return false;
695    }
696}
697
698bool AudioSystem::isLowVisibility(stream_type stream)
699{
700    if (stream == AudioSystem::SYSTEM || stream == AudioSystem::NOTIFICATION) {
701        return true;
702    } else {
703        return false;
704    }
705}
706
707bool AudioSystem::isInputChannel(uint32_t channel)
708{
709    if ((channel & ~AudioSystem::CHANNEL_IN_ALL) == 0) {
710        return true;
711    } else {
712        return false;
713    }
714}
715
716bool AudioSystem::isOutputChannel(uint32_t channel)
717{
718    if ((channel & ~AudioSystem::CHANNEL_OUT_ALL) == 0) {
719        return true;
720    } else {
721        return false;
722    }
723}
724
725bool AudioSystem::isValidFormat(uint32_t format)
726{
727    switch (format & MAIN_FORMAT_MASK) {
728    case         PCM:
729    case         MP3:
730    case         AMR_NB:
731    case         AMR_WB:
732    case         AAC:
733    case         HE_AAC_V1:
734    case         HE_AAC_V2:
735    case         VORBIS:
736        return true;
737    default:
738        return false;
739    }
740}
741
742bool AudioSystem::isLinearPCM(uint32_t format)
743{
744    switch (format) {
745    case         PCM_16_BIT:
746    case         PCM_8_BIT:
747        return true;
748    default:
749        return false;
750    }
751}
752
753//------------------------- AudioParameter class implementation ---------------
754
755const char *AudioParameter::keyRouting = "routing";
756const char *AudioParameter::keySamplingRate = "sampling_rate";
757const char *AudioParameter::keyFormat = "format";
758const char *AudioParameter::keyChannels = "channels";
759const char *AudioParameter::keyFrameCount = "frame_count";
760
761AudioParameter::AudioParameter(const String8& keyValuePairs)
762{
763    char *str = new char[keyValuePairs.length()+1];
764    mKeyValuePairs = keyValuePairs;
765
766    strcpy(str, keyValuePairs.string());
767    char *pair = strtok(str, ";");
768    while (pair != NULL) {
769        if (strlen(pair) != 0) {
770            size_t eqIdx = strcspn(pair, "=");
771            String8 key = String8(pair, eqIdx);
772            String8 value;
773            if (eqIdx == strlen(pair)) {
774                value = String8("");
775            } else {
776                value = String8(pair + eqIdx + 1);
777            }
778            if (mParameters.indexOfKey(key) < 0) {
779                mParameters.add(key, value);
780            } else {
781                mParameters.replaceValueFor(key, value);
782            }
783        } else {
784            LOGV("AudioParameter() cstor empty key value pair");
785        }
786        pair = strtok(NULL, ";");
787    }
788
789    delete[] str;
790}
791
792AudioParameter::~AudioParameter()
793{
794    mParameters.clear();
795}
796
797String8 AudioParameter::toString()
798{
799    String8 str = String8("");
800
801    size_t size = mParameters.size();
802    for (size_t i = 0; i < size; i++) {
803        str += mParameters.keyAt(i);
804        str += "=";
805        str += mParameters.valueAt(i);
806        if (i < (size - 1)) str += ";";
807    }
808    return str;
809}
810
811status_t AudioParameter::add(const String8& key, const String8& value)
812{
813    if (mParameters.indexOfKey(key) < 0) {
814        mParameters.add(key, value);
815        return NO_ERROR;
816    } else {
817        mParameters.replaceValueFor(key, value);
818        return ALREADY_EXISTS;
819    }
820}
821
822status_t AudioParameter::addInt(const String8& key, const int value)
823{
824    char str[12];
825    if (snprintf(str, 12, "%d", value) > 0) {
826        String8 str8 = String8(str);
827        return add(key, str8);
828    } else {
829        return BAD_VALUE;
830    }
831}
832
833status_t AudioParameter::addFloat(const String8& key, const float value)
834{
835    char str[23];
836    if (snprintf(str, 23, "%.10f", value) > 0) {
837        String8 str8 = String8(str);
838        return add(key, str8);
839    } else {
840        return BAD_VALUE;
841    }
842}
843
844status_t AudioParameter::remove(const String8& key)
845{
846    if (mParameters.indexOfKey(key) >= 0) {
847        mParameters.removeItem(key);
848        return NO_ERROR;
849    } else {
850        return BAD_VALUE;
851    }
852}
853
854status_t AudioParameter::get(const String8& key, String8& value)
855{
856    if (mParameters.indexOfKey(key) >= 0) {
857        value = mParameters.valueFor(key);
858        return NO_ERROR;
859    } else {
860        return BAD_VALUE;
861    }
862}
863
864status_t AudioParameter::getInt(const String8& key, int& value)
865{
866    String8 str8;
867    status_t result = get(key, str8);
868    value = 0;
869    if (result == NO_ERROR) {
870        int val;
871        if (sscanf(str8.string(), "%d", &val) == 1) {
872            value = val;
873        } else {
874            result = INVALID_OPERATION;
875        }
876    }
877    return result;
878}
879
880status_t AudioParameter::getFloat(const String8& key, float& value)
881{
882    String8 str8;
883    status_t result = get(key, str8);
884    value = 0;
885    if (result == NO_ERROR) {
886        float val;
887        if (sscanf(str8.string(), "%f", &val) == 1) {
888            value = val;
889        } else {
890            result = INVALID_OPERATION;
891        }
892    }
893    return result;
894}
895
896status_t AudioParameter::getAt(size_t index, String8& key, String8& value)
897{
898    if (mParameters.size() > index) {
899        key = mParameters.keyAt(index);
900        value = mParameters.valueAt(index);
901        return NO_ERROR;
902    } else {
903        return BAD_VALUE;
904    }
905}
906}; // namespace android
907
908