AudioSystem.cpp revision f0ee6f4055e26fb35d9c526a596668a4dc9da5ba 
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
352    if (gAudioErrorCallback) {
353        gAudioErrorCallback(DEAD_OBJECT);
354    }
355    LOGW("AudioFlinger server died!");
356}
357
358void AudioSystem::AudioFlingerClient::ioConfigChanged(int event, int ioHandle, void *param2) {
359    LOGV("ioConfigChanged() event %d", event);
360    OutputDescriptor *desc;
361    uint32_t stream;
362
363    if (ioHandle == 0) return;
364
365    Mutex::Autolock _l(AudioSystem::gLock);
366
367    switch (event) {
368    case STREAM_CONFIG_CHANGED:
369        if (param2 == 0) break;
370        stream = *(uint32_t *)param2;
371        LOGV("ioConfigChanged() STREAM_CONFIG_CHANGED stream %d, output %d", stream, ioHandle);
372        if (gStreamOutputMap.indexOfKey(stream) >= 0) {
373            gStreamOutputMap.replaceValueFor(stream, ioHandle);
374        }
375        break;
376    case OUTPUT_OPENED: {
377        if (gOutputs.indexOfKey(ioHandle) >= 0) {
378            LOGV("ioConfigChanged() opening already existing output! %d", ioHandle);
379            break;
380        }
381        if (param2 == 0) break;
382        desc = (OutputDescriptor *)param2;
383
384        OutputDescriptor *outputDesc =  new OutputDescriptor(*desc);
385        gOutputs.add(ioHandle, outputDesc);
386        LOGV("ioConfigChanged() new output samplingRate %d, format %d channels %d frameCount %d latency %d",
387                outputDesc->samplingRate, outputDesc->format, outputDesc->channels, outputDesc->frameCount, outputDesc->latency);
388        } break;
389    case OUTPUT_CLOSED: {
390        if (gOutputs.indexOfKey(ioHandle) < 0) {
391            LOGW("ioConfigChanged() closing unknow output! %d", ioHandle);
392            break;
393        }
394        LOGV("ioConfigChanged() output %d closed", ioHandle);
395
396        gOutputs.removeItem(ioHandle);
397        for (int i = gStreamOutputMap.size() - 1; i >= 0 ; i--) {
398            if (gStreamOutputMap.valueAt(i) == ioHandle) {
399                gStreamOutputMap.removeItemsAt(i);
400            }
401        }
402        } break;
403
404    case OUTPUT_CONFIG_CHANGED: {
405        int index = gOutputs.indexOfKey(ioHandle);
406        if (index < 0) {
407            LOGW("ioConfigChanged() modifying unknow output! %d", ioHandle);
408            break;
409        }
410        if (param2 == 0) break;
411        desc = (OutputDescriptor *)param2;
412
413        LOGV("ioConfigChanged() new config for output %d samplingRate %d, format %d channels %d frameCount %d latency %d",
414                ioHandle, desc->samplingRate, desc->format,
415                desc->channels, desc->frameCount, desc->latency);
416        OutputDescriptor *outputDesc = gOutputs.valueAt(index);
417        delete outputDesc;
418        outputDesc =  new OutputDescriptor(*desc);
419        gOutputs.replaceValueFor(ioHandle, outputDesc);
420    } break;
421    case INPUT_OPENED:
422    case INPUT_CLOSED:
423    case INPUT_CONFIG_CHANGED:
424        break;
425
426    }
427}
428
429void AudioSystem::setErrorCallback(audio_error_callback cb) {
430    Mutex::Autolock _l(gLock);
431    gAudioErrorCallback = cb;
432}
433
434bool AudioSystem::routedToA2dpOutput(int streamType) {
435    switch(streamType) {
436    case MUSIC:
437    case VOICE_CALL:
438    case BLUETOOTH_SCO:
439    case SYSTEM:
440        return true;
441    default:
442        return false;
443    }
444}
445
446
447// client singleton for AudioPolicyService binder interface
448sp<IAudioPolicyService> AudioSystem::gAudioPolicyService;
449sp<AudioSystem::AudioPolicyServiceClient> AudioSystem::gAudioPolicyServiceClient;
450
451
452// establish binder interface to AudioFlinger service
453const sp<IAudioPolicyService>& AudioSystem::get_audio_policy_service()
454{
455    gLock.lock();
456    if (gAudioPolicyService.get() == 0) {
457        sp<IServiceManager> sm = defaultServiceManager();
458        sp<IBinder> binder;
459        do {
460            binder = sm->getService(String16("media.audio_policy"));
461            if (binder != 0)
462                break;
463            LOGW("AudioPolicyService not published, waiting...");
464            usleep(500000); // 0.5 s
465        } while(true);
466        if (gAudioPolicyServiceClient == NULL) {
467            gAudioPolicyServiceClient = new AudioPolicyServiceClient();
468        }
469        binder->linkToDeath(gAudioPolicyServiceClient);
470        gAudioPolicyService = interface_cast<IAudioPolicyService>(binder);
471        gLock.unlock();
472    } else {
473        gLock.unlock();
474    }
475    return gAudioPolicyService;
476}
477
478status_t AudioSystem::setDeviceConnectionState(audio_devices device,
479                                                  device_connection_state state,
480                                                  const char *device_address)
481{
482    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
483    if (aps == 0) return PERMISSION_DENIED;
484
485    return aps->setDeviceConnectionState(device, state, device_address);
486}
487
488AudioSystem::device_connection_state AudioSystem::getDeviceConnectionState(audio_devices device,
489                                                  const char *device_address)
490{
491    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
492    if (aps == 0) return DEVICE_STATE_UNAVAILABLE;
493
494    return aps->getDeviceConnectionState(device, device_address);
495}
496
497status_t AudioSystem::setPhoneState(int state)
498{
499    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
500    if (aps == 0) return PERMISSION_DENIED;
501
502    return aps->setPhoneState(state);
503}
504
505status_t AudioSystem::setRingerMode(uint32_t mode, uint32_t mask)
506{
507    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
508    if (aps == 0) return PERMISSION_DENIED;
509    return aps->setRingerMode(mode, mask);
510}
511
512status_t AudioSystem::setForceUse(force_use usage, forced_config config)
513{
514    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
515    if (aps == 0) return PERMISSION_DENIED;
516    return aps->setForceUse(usage, config);
517}
518
519AudioSystem::forced_config AudioSystem::getForceUse(force_use usage)
520{
521    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
522    if (aps == 0) return FORCE_NONE;
523    return aps->getForceUse(usage);
524}
525
526
527audio_io_handle_t AudioSystem::getOutput(stream_type stream,
528                                    uint32_t samplingRate,
529                                    uint32_t format,
530                                    uint32_t channels,
531                                    output_flags flags)
532{
533    audio_io_handle_t output = 0;
534    if ((flags & AudioSystem::OUTPUT_FLAG_DIRECT) == 0) {
535        Mutex::Autolock _l(gLock);
536        output = AudioSystem::gStreamOutputMap.valueFor(stream);
537        LOGV_IF((output != 0), "getOutput() read %d from cache for stream %d", output, stream);
538    }
539    if (output == 0) {
540        const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
541        if (aps == 0) return 0;
542        output = aps->getOutput(stream, samplingRate, format, channels, flags);
543        if ((flags & AudioSystem::OUTPUT_FLAG_DIRECT) == 0) {
544            Mutex::Autolock _l(gLock);
545            AudioSystem::gStreamOutputMap.add(stream, output);
546        }
547    }
548    return output;
549}
550
551status_t AudioSystem::startOutput(audio_io_handle_t output, AudioSystem::stream_type stream)
552{
553    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
554    if (aps == 0) return PERMISSION_DENIED;
555    return aps->startOutput(output, stream);
556}
557
558status_t AudioSystem::stopOutput(audio_io_handle_t output, AudioSystem::stream_type stream)
559{
560    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
561    if (aps == 0) return PERMISSION_DENIED;
562    return aps->stopOutput(output, stream);
563}
564
565void AudioSystem::releaseOutput(audio_io_handle_t output)
566{
567    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
568    if (aps == 0) return;
569    aps->releaseOutput(output);
570}
571
572audio_io_handle_t AudioSystem::getInput(int inputSource,
573                                    uint32_t samplingRate,
574                                    uint32_t format,
575                                    uint32_t channels,
576                                    audio_in_acoustics acoustics)
577{
578    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
579    if (aps == 0) return 0;
580    return aps->getInput(inputSource, samplingRate, format, channels, acoustics);
581}
582
583status_t AudioSystem::startInput(audio_io_handle_t input)
584{
585    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
586    if (aps == 0) return PERMISSION_DENIED;
587    return aps->startInput(input);
588}
589
590status_t AudioSystem::stopInput(audio_io_handle_t input)
591{
592    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
593    if (aps == 0) return PERMISSION_DENIED;
594    return aps->stopInput(input);
595}
596
597void AudioSystem::releaseInput(audio_io_handle_t input)
598{
599    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
600    if (aps == 0) return;
601    aps->releaseInput(input);
602}
603
604status_t AudioSystem::initStreamVolume(stream_type stream,
605                                    int indexMin,
606                                    int indexMax)
607{
608    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
609    if (aps == 0) return PERMISSION_DENIED;
610    return aps->initStreamVolume(stream, indexMin, indexMax);
611}
612
613status_t AudioSystem::setStreamVolumeIndex(stream_type stream, int index)
614{
615    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
616    if (aps == 0) return PERMISSION_DENIED;
617    return aps->setStreamVolumeIndex(stream, index);
618}
619
620status_t AudioSystem::getStreamVolumeIndex(stream_type stream, int *index)
621{
622    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
623    if (aps == 0) return PERMISSION_DENIED;
624    return aps->getStreamVolumeIndex(stream, index);
625}
626
627// ---------------------------------------------------------------------------
628
629void AudioSystem::AudioPolicyServiceClient::binderDied(const wp<IBinder>& who) {
630    Mutex::Autolock _l(AudioSystem::gLock);
631    AudioSystem::gAudioPolicyService.clear();
632
633    LOGW("AudioPolicyService server died!");
634}
635
636// ---------------------------------------------------------------------------
637
638
639// use emulated popcount optimization
640// http://www.df.lth.se/~john_e/gems/gem002d.html
641uint32_t AudioSystem::popCount(uint32_t u)
642{
643    u = ((u&0x55555555) + ((u>>1)&0x55555555));
644    u = ((u&0x33333333) + ((u>>2)&0x33333333));
645    u = ((u&0x0f0f0f0f) + ((u>>4)&0x0f0f0f0f));
646    u = ((u&0x00ff00ff) + ((u>>8)&0x00ff00ff));
647    u = ( u&0x0000ffff) + (u>>16);
648    return u;
649}
650
651bool AudioSystem::isOutputDevice(audio_devices device)
652{
653    if ((popCount(device) == 1 ) &&
654        ((device & ~AudioSystem::DEVICE_OUT_ALL) == 0)) {
655        return true;
656    } else {
657        return false;
658    }
659}
660
661bool AudioSystem::isInputDevice(audio_devices device)
662{
663    if ((popCount(device) == 1 ) &&
664        ((device & ~AudioSystem::DEVICE_IN_ALL) == 0)) {
665        return true;
666    } else {
667        return false;
668    }
669}
670
671bool AudioSystem::isA2dpDevice(audio_devices device)
672{
673    if ((popCount(device) == 1 ) &&
674        (device & (AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP |
675                   AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES |
676                   AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER))) {
677        return true;
678    } else {
679        return false;
680    }
681}
682
683bool AudioSystem::isBluetoothScoDevice(audio_devices device)
684{
685    if ((popCount(device) == 1 ) &&
686        (device & (AudioSystem::DEVICE_OUT_BLUETOOTH_SCO |
687                   AudioSystem::DEVICE_OUT_BLUETOOTH_SCO_HEADSET |
688                   AudioSystem::DEVICE_OUT_BLUETOOTH_SCO_CARKIT))) {
689        return true;
690    } else {
691        return false;
692    }
693}
694
695bool AudioSystem::isLowVisibility(stream_type stream)
696{
697    if (stream == AudioSystem::SYSTEM || stream == AudioSystem::NOTIFICATION) {
698        return true;
699    } else {
700        return false;
701    }
702}
703
704bool AudioSystem::isInputChannel(uint32_t channel)
705{
706    if ((channel & ~AudioSystem::CHANNEL_IN_ALL) == 0) {
707        return true;
708    } else {
709        return false;
710    }
711}
712
713bool AudioSystem::isOutputChannel(uint32_t channel)
714{
715    if ((channel & ~AudioSystem::CHANNEL_OUT_ALL) == 0) {
716        return true;
717    } else {
718        return false;
719    }
720}
721
722bool AudioSystem::isValidFormat(uint32_t format)
723{
724    switch (format & MAIN_FORMAT_MASK) {
725    case         PCM:
726    case         MP3:
727    case         AMR_NB:
728    case         AMR_WB:
729    case         AAC:
730    case         HE_AAC_V1:
731    case         HE_AAC_V2:
732    case         VORBIS:
733        return true;
734    default:
735        return false;
736    }
737}
738
739bool AudioSystem::isLinearPCM(uint32_t format)
740{
741    switch (format) {
742    case         PCM_16_BIT:
743    case         PCM_8_BIT:
744        return true;
745    default:
746        return false;
747    }
748}
749
750//------------------------- AudioParameter class implementation ---------------
751
752const char *AudioParameter::keyRouting = "routing";
753const char *AudioParameter::keySamplingRate = "sampling_rate";
754const char *AudioParameter::keyFormat = "format";
755const char *AudioParameter::keyChannels = "channels";
756const char *AudioParameter::keyFrameCount = "frame_count";
757
758AudioParameter::AudioParameter(const String8& keyValuePairs)
759{
760    char *str = new char[keyValuePairs.length()+1];
761    mKeyValuePairs = keyValuePairs;
762
763    strcpy(str, keyValuePairs.string());
764    char *pair = strtok(str, ";");
765    while (pair != NULL) {
766        if (strlen(pair) != 0) {
767            size_t eqIdx = strcspn(pair, "=");
768            String8 key = String8(pair, eqIdx);
769            String8 value;
770            if (eqIdx == strlen(pair)) {
771                value = String8("");
772            } else {
773                value = String8(pair + eqIdx + 1);
774            }
775            if (mParameters.indexOfKey(key) < 0) {
776                mParameters.add(key, value);
777            } else {
778                mParameters.replaceValueFor(key, value);
779            }
780        } else {
781            LOGV("AudioParameter() cstor empty key value pair");
782        }
783        pair = strtok(NULL, ";");
784    }
785
786    delete[] str;
787}
788
789AudioParameter::~AudioParameter()
790{
791    mParameters.clear();
792}
793
794String8 AudioParameter::toString()
795{
796    String8 str = String8("");
797
798    size_t size = mParameters.size();
799    for (size_t i = 0; i < size; i++) {
800        str += mParameters.keyAt(i);
801        str += "=";
802        str += mParameters.valueAt(i);
803        if (i < (size - 1)) str += ";";
804    }
805    return str;
806}
807
808status_t AudioParameter::add(const String8& key, const String8& value)
809{
810    if (mParameters.indexOfKey(key) < 0) {
811        mParameters.add(key, value);
812        return NO_ERROR;
813    } else {
814        mParameters.replaceValueFor(key, value);
815        return ALREADY_EXISTS;
816    }
817}
818
819status_t AudioParameter::addInt(const String8& key, const int value)
820{
821    char str[12];
822    if (snprintf(str, 12, "%d", value) > 0) {
823        String8 str8 = String8(str);
824        return add(key, str8);
825    } else {
826        return BAD_VALUE;
827    }
828}
829
830status_t AudioParameter::addFloat(const String8& key, const float value)
831{
832    char str[23];
833    if (snprintf(str, 23, "%.10f", value) > 0) {
834        String8 str8 = String8(str);
835        return add(key, str8);
836    } else {
837        return BAD_VALUE;
838    }
839}
840
841status_t AudioParameter::remove(const String8& key)
842{
843    if (mParameters.indexOfKey(key) >= 0) {
844        mParameters.removeItem(key);
845        return NO_ERROR;
846    } else {
847        return BAD_VALUE;
848    }
849}
850
851status_t AudioParameter::get(const String8& key, String8& value)
852{
853    if (mParameters.indexOfKey(key) >= 0) {
854        value = mParameters.valueFor(key);
855        return NO_ERROR;
856    } else {
857        return BAD_VALUE;
858    }
859}
860
861status_t AudioParameter::getInt(const String8& key, int& value)
862{
863    String8 str8;
864    status_t result = get(key, str8);
865    value = 0;
866    if (result == NO_ERROR) {
867        int val;
868        if (sscanf(str8.string(), "%d", &val) == 1) {
869            value = val;
870        } else {
871            result = INVALID_OPERATION;
872        }
873    }
874    return result;
875}
876
877status_t AudioParameter::getFloat(const String8& key, float& value)
878{
879    String8 str8;
880    status_t result = get(key, str8);
881    value = 0;
882    if (result == NO_ERROR) {
883        float val;
884        if (sscanf(str8.string(), "%f", &val) == 1) {
885            value = val;
886        } else {
887            result = INVALID_OPERATION;
888        }
889    }
890    return result;
891}
892
893status_t AudioParameter::getAt(size_t index, String8& key, String8& value)
894{
895    if (mParameters.size() > index) {
896        key = mParameters.keyAt(index);
897        value = mParameters.valueAt(index);
898        return NO_ERROR;
899    } else {
900        return BAD_VALUE;
901    }
902}
903}; // namespace android
904
905