AudioSystem.cpp revision fa2877b9ea48baed934b866d2ab3658b69c4c869 
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
338// ---------------------------------------------------------------------------
339
340void AudioSystem::AudioFlingerClient::binderDied(const wp<IBinder>& who) {
341    Mutex::Autolock _l(AudioSystem::gLock);
342
343    AudioSystem::gAudioFlinger.clear();
344
345    if (gAudioErrorCallback) {
346        gAudioErrorCallback(DEAD_OBJECT);
347    }
348    LOGW("AudioFlinger server died!");
349}
350
351void AudioSystem::AudioFlingerClient::ioConfigChanged(int event, int ioHandle, void *param2) {
352    LOGV("ioConfigChanged() event %d", event);
353    OutputDescriptor *desc;
354    uint32_t stream;
355
356    if (ioHandle == 0) return;
357
358    Mutex::Autolock _l(AudioSystem::gLock);
359
360    switch (event) {
361    case STREAM_CONFIG_CHANGED:
362        if (param2 == 0) break;
363        stream = *(uint32_t *)param2;
364        LOGV("ioConfigChanged() STREAM_CONFIG_CHANGED stream %d, output %d", stream, ioHandle);
365        if (gStreamOutputMap.indexOfKey(stream) >= 0) {
366            gStreamOutputMap.replaceValueFor(stream, ioHandle);
367        }
368        break;
369    case OUTPUT_OPENED: {
370        if (gOutputs.indexOfKey(ioHandle) >= 0) {
371            LOGV("ioConfigChanged() opening already existing output! %d", ioHandle);
372            break;
373        }
374        if (param2 == 0) break;
375        desc = (OutputDescriptor *)param2;
376
377        OutputDescriptor *outputDesc =  new OutputDescriptor(*desc);
378        gOutputs.add(ioHandle, outputDesc);
379        LOGV("ioConfigChanged() new output samplingRate %d, format %d channels %d frameCount %d latency %d",
380                outputDesc->samplingRate, outputDesc->format, outputDesc->channels, outputDesc->frameCount, outputDesc->latency);
381        } break;
382    case OUTPUT_CLOSED: {
383        if (gOutputs.indexOfKey(ioHandle) < 0) {
384            LOGW("ioConfigChanged() closing unknow output! %d", ioHandle);
385            break;
386        }
387        LOGV("ioConfigChanged() output %d closed", ioHandle);
388
389        gOutputs.removeItem(ioHandle);
390        for (int i = gStreamOutputMap.size() - 1; i >= 0 ; i--) {
391            if (gStreamOutputMap.valueAt(i) == ioHandle) {
392                gStreamOutputMap.removeItemsAt(i);
393            }
394        }
395        } break;
396
397    case OUTPUT_CONFIG_CHANGED: {
398        int index = gOutputs.indexOfKey(ioHandle);
399        if (index < 0) {
400            LOGW("ioConfigChanged() modifying unknow output! %d", ioHandle);
401            break;
402        }
403        if (param2 == 0) break;
404        desc = (OutputDescriptor *)param2;
405
406        LOGV("ioConfigChanged() new config for output %d samplingRate %d, format %d channels %d frameCount %d latency %d",
407                ioHandle, desc->samplingRate, desc->format,
408                desc->channels, desc->frameCount, desc->latency);
409        OutputDescriptor *outputDesc = gOutputs.valueAt(index);
410        delete outputDesc;
411        outputDesc =  new OutputDescriptor(*desc);
412        gOutputs.replaceValueFor(ioHandle, outputDesc);
413    } break;
414    case INPUT_OPENED:
415    case INPUT_CLOSED:
416    case INPUT_CONFIG_CHANGED:
417        break;
418
419    }
420}
421
422void AudioSystem::setErrorCallback(audio_error_callback cb) {
423    Mutex::Autolock _l(gLock);
424    gAudioErrorCallback = cb;
425}
426
427bool AudioSystem::routedToA2dpOutput(int streamType) {
428    switch(streamType) {
429    case MUSIC:
430    case VOICE_CALL:
431    case BLUETOOTH_SCO:
432    case SYSTEM:
433        return true;
434    default:
435        return false;
436    }
437}
438
439
440// client singleton for AudioPolicyService binder interface
441sp<IAudioPolicyService> AudioSystem::gAudioPolicyService;
442sp<AudioSystem::AudioPolicyServiceClient> AudioSystem::gAudioPolicyServiceClient;
443
444
445// establish binder interface to AudioFlinger service
446const sp<IAudioPolicyService>& AudioSystem::get_audio_policy_service()
447{
448    gLock.lock();
449    if (gAudioPolicyService.get() == 0) {
450        sp<IServiceManager> sm = defaultServiceManager();
451        sp<IBinder> binder;
452        do {
453            binder = sm->getService(String16("media.audio_policy"));
454            if (binder != 0)
455                break;
456            LOGW("AudioPolicyService not published, waiting...");
457            usleep(500000); // 0.5 s
458        } while(true);
459        if (gAudioPolicyServiceClient == NULL) {
460            gAudioPolicyServiceClient = new AudioPolicyServiceClient();
461        }
462        binder->linkToDeath(gAudioPolicyServiceClient);
463        gAudioPolicyService = interface_cast<IAudioPolicyService>(binder);
464        gLock.unlock();
465    } else {
466        gLock.unlock();
467    }
468    return gAudioPolicyService;
469}
470
471status_t AudioSystem::setDeviceConnectionState(audio_devices device,
472                                                  device_connection_state state,
473                                                  const char *device_address)
474{
475    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
476    if (aps == 0) return PERMISSION_DENIED;
477
478    return aps->setDeviceConnectionState(device, state, device_address);
479}
480
481AudioSystem::device_connection_state AudioSystem::getDeviceConnectionState(audio_devices device,
482                                                  const char *device_address)
483{
484    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
485    if (aps == 0) return DEVICE_STATE_UNAVAILABLE;
486
487    return aps->getDeviceConnectionState(device, device_address);
488}
489
490status_t AudioSystem::setPhoneState(int state)
491{
492    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
493    if (aps == 0) return PERMISSION_DENIED;
494
495    return aps->setPhoneState(state);
496}
497
498status_t AudioSystem::setRingerMode(uint32_t mode, uint32_t mask)
499{
500    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
501    if (aps == 0) return PERMISSION_DENIED;
502    return aps->setRingerMode(mode, mask);
503}
504
505status_t AudioSystem::setForceUse(force_use usage, forced_config config)
506{
507    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
508    if (aps == 0) return PERMISSION_DENIED;
509    return aps->setForceUse(usage, config);
510}
511
512AudioSystem::forced_config AudioSystem::getForceUse(force_use usage)
513{
514    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
515    if (aps == 0) return FORCE_NONE;
516    return aps->getForceUse(usage);
517}
518
519
520audio_io_handle_t AudioSystem::getOutput(stream_type stream,
521                                    uint32_t samplingRate,
522                                    uint32_t format,
523                                    uint32_t channels,
524                                    output_flags flags)
525{
526    audio_io_handle_t output = 0;
527    if ((flags & AudioSystem::OUTPUT_FLAG_DIRECT) == 0) {
528        Mutex::Autolock _l(gLock);
529        output = AudioSystem::gStreamOutputMap.valueFor(stream);
530        LOGV_IF((output != 0), "getOutput() read %d from cache for stream %d", output, stream);
531    }
532    if (output == 0) {
533        const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
534        if (aps == 0) return 0;
535        output = aps->getOutput(stream, samplingRate, format, channels, flags);
536        if ((flags & AudioSystem::OUTPUT_FLAG_DIRECT) == 0) {
537            Mutex::Autolock _l(gLock);
538            AudioSystem::gStreamOutputMap.add(stream, output);
539        }
540    }
541    return output;
542}
543
544status_t AudioSystem::startOutput(audio_io_handle_t output, AudioSystem::stream_type stream)
545{
546    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
547    if (aps == 0) return PERMISSION_DENIED;
548    return aps->startOutput(output, stream);
549}
550
551status_t AudioSystem::stopOutput(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->stopOutput(output, stream);
556}
557
558void AudioSystem::releaseOutput(audio_io_handle_t output)
559{
560    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
561    if (aps == 0) return;
562    aps->releaseOutput(output);
563}
564
565audio_io_handle_t AudioSystem::getInput(int inputSource,
566                                    uint32_t samplingRate,
567                                    uint32_t format,
568                                    uint32_t channels,
569                                    audio_in_acoustics acoustics)
570{
571    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
572    if (aps == 0) return 0;
573    return aps->getInput(inputSource, samplingRate, format, channels, acoustics);
574}
575
576status_t AudioSystem::startInput(audio_io_handle_t input)
577{
578    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
579    if (aps == 0) return PERMISSION_DENIED;
580    return aps->startInput(input);
581}
582
583status_t AudioSystem::stopInput(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->stopInput(input);
588}
589
590void AudioSystem::releaseInput(audio_io_handle_t input)
591{
592    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
593    if (aps == 0) return;
594    aps->releaseInput(input);
595}
596
597status_t AudioSystem::initStreamVolume(stream_type stream,
598                                    int indexMin,
599                                    int indexMax)
600{
601    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
602    if (aps == 0) return PERMISSION_DENIED;
603    return aps->initStreamVolume(stream, indexMin, indexMax);
604}
605
606status_t AudioSystem::setStreamVolumeIndex(stream_type stream, int index)
607{
608    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
609    if (aps == 0) return PERMISSION_DENIED;
610    return aps->setStreamVolumeIndex(stream, index);
611}
612
613status_t AudioSystem::getStreamVolumeIndex(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->getStreamVolumeIndex(stream, index);
618}
619
620// ---------------------------------------------------------------------------
621
622void AudioSystem::AudioPolicyServiceClient::binderDied(const wp<IBinder>& who) {
623    Mutex::Autolock _l(AudioSystem::gLock);
624    AudioSystem::gAudioPolicyService.clear();
625
626    LOGW("AudioPolicyService server died!");
627}
628
629// ---------------------------------------------------------------------------
630
631
632// use emulated popcount optimization
633// http://www.df.lth.se/~john_e/gems/gem002d.html
634uint32_t AudioSystem::popCount(uint32_t u)
635{
636    u = ((u&0x55555555) + ((u>>1)&0x55555555));
637    u = ((u&0x33333333) + ((u>>2)&0x33333333));
638    u = ((u&0x0f0f0f0f) + ((u>>4)&0x0f0f0f0f));
639    u = ((u&0x00ff00ff) + ((u>>8)&0x00ff00ff));
640    u = ( u&0x0000ffff) + (u>>16);
641    return u;
642}
643
644bool AudioSystem::isOutputDevice(audio_devices device)
645{
646    if ((popCount(device) == 1 ) &&
647        ((device & ~AudioSystem::DEVICE_OUT_ALL) == 0)) {
648        return true;
649    } else {
650        return false;
651    }
652}
653
654bool AudioSystem::isInputDevice(audio_devices device)
655{
656    if ((popCount(device) == 1 ) &&
657        ((device & ~AudioSystem::DEVICE_IN_ALL) == 0)) {
658        return true;
659    } else {
660        return false;
661    }
662}
663
664bool AudioSystem::isA2dpDevice(audio_devices device)
665{
666    if ((popCount(device) == 1 ) &&
667        (device & (AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP |
668                   AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES |
669                   AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER))) {
670        return true;
671    } else {
672        return false;
673    }
674}
675
676bool AudioSystem::isBluetoothScoDevice(audio_devices device)
677{
678    if ((popCount(device) == 1 ) &&
679        (device & (AudioSystem::DEVICE_OUT_BLUETOOTH_SCO |
680                   AudioSystem::DEVICE_OUT_BLUETOOTH_SCO_HEADSET |
681                   AudioSystem::DEVICE_OUT_BLUETOOTH_SCO_CARKIT))) {
682        return true;
683    } else {
684        return false;
685    }
686}
687
688bool AudioSystem::isLowVisibility(stream_type stream)
689{
690    if (stream == AudioSystem::SYSTEM || stream == AudioSystem::NOTIFICATION) {
691        return true;
692    } else {
693        return false;
694    }
695}
696
697bool AudioSystem::isInputChannel(uint32_t channel)
698{
699    if ((channel & ~AudioSystem::CHANNEL_IN_ALL) == 0) {
700        return true;
701    } else {
702        return false;
703    }
704}
705
706bool AudioSystem::isOutputChannel(uint32_t channel)
707{
708    if ((channel & ~AudioSystem::CHANNEL_OUT_ALL) == 0) {
709        return true;
710    } else {
711        return false;
712    }
713}
714
715bool AudioSystem::isValidFormat(uint32_t format)
716{
717    switch (format & MAIN_FORMAT_MASK) {
718    case         PCM:
719    case         MP3:
720    case         AMR_NB:
721    case         AMR_WB:
722    case         AAC:
723    case         HE_AAC_V1:
724    case         HE_AAC_V2:
725    case         VORBIS:
726        return true;
727    default:
728        return false;
729    }
730}
731
732bool AudioSystem::isLinearPCM(uint32_t format)
733{
734    switch (format) {
735    case         PCM_16_BIT:
736    case         PCM_8_BIT:
737        return true;
738    default:
739        return false;
740    }
741}
742
743//------------------------- AudioParameter class implementation ---------------
744
745const char *AudioParameter::keyRouting = "routing";
746const char *AudioParameter::keySamplingRate = "sampling_rate";
747const char *AudioParameter::keyFormat = "format";
748const char *AudioParameter::keyChannels = "channels";
749const char *AudioParameter::keyFrameCount = "frame_count";
750
751AudioParameter::AudioParameter(const String8& keyValuePairs)
752{
753    char *str = new char[keyValuePairs.length()+1];
754    mKeyValuePairs = keyValuePairs;
755
756    strcpy(str, keyValuePairs.string());
757    char *pair = strtok(str, ";");
758    while (pair != NULL) {
759        if (strlen(pair) != 0) {
760            size_t eqIdx = strcspn(pair, "=");
761            String8 key = String8(pair, eqIdx);
762            String8 value;
763            if (eqIdx == strlen(pair)) {
764                value = String8("");
765            } else {
766                value = String8(pair + eqIdx + 1);
767            }
768            if (mParameters.indexOfKey(key) < 0) {
769                mParameters.add(key, value);
770            } else {
771                mParameters.replaceValueFor(key, value);
772            }
773        } else {
774            LOGV("AudioParameter() cstor empty key value pair");
775        }
776        pair = strtok(NULL, ";");
777    }
778
779    delete[] str;
780}
781
782AudioParameter::~AudioParameter()
783{
784    mParameters.clear();
785}
786
787String8 AudioParameter::toString()
788{
789    String8 str = String8("");
790
791    size_t size = mParameters.size();
792    for (size_t i = 0; i < size; i++) {
793        str += mParameters.keyAt(i);
794        str += "=";
795        str += mParameters.valueAt(i);
796        if (i < (size - 1)) str += ";";
797    }
798    return str;
799}
800
801status_t AudioParameter::add(const String8& key, const String8& value)
802{
803    if (mParameters.indexOfKey(key) < 0) {
804        mParameters.add(key, value);
805        return NO_ERROR;
806    } else {
807        mParameters.replaceValueFor(key, value);
808        return ALREADY_EXISTS;
809    }
810}
811
812status_t AudioParameter::addInt(const String8& key, const int value)
813{
814    char str[12];
815    if (snprintf(str, 12, "%d", value) > 0) {
816        String8 str8 = String8(str);
817        return add(key, str8);
818    } else {
819        return BAD_VALUE;
820    }
821}
822
823status_t AudioParameter::addFloat(const String8& key, const float value)
824{
825    char str[23];
826    if (snprintf(str, 23, "%.10f", value) > 0) {
827        String8 str8 = String8(str);
828        return add(key, str8);
829    } else {
830        return BAD_VALUE;
831    }
832}
833
834status_t AudioParameter::remove(const String8& key)
835{
836    if (mParameters.indexOfKey(key) >= 0) {
837        mParameters.removeItem(key);
838        return NO_ERROR;
839    } else {
840        return BAD_VALUE;
841    }
842}
843
844status_t AudioParameter::get(const String8& key, String8& value)
845{
846    if (mParameters.indexOfKey(key) >= 0) {
847        value = mParameters.valueFor(key);
848        return NO_ERROR;
849    } else {
850        return BAD_VALUE;
851    }
852}
853
854status_t AudioParameter::getInt(const String8& key, int& value)
855{
856    String8 str8;
857    status_t result = get(key, str8);
858    value = 0;
859    if (result == NO_ERROR) {
860        int val;
861        if (sscanf(str8.string(), "%d", &val) == 1) {
862            value = val;
863        } else {
864            result = INVALID_OPERATION;
865        }
866    }
867    return result;
868}
869
870status_t AudioParameter::getFloat(const String8& key, float& value)
871{
872    String8 str8;
873    status_t result = get(key, str8);
874    value = 0;
875    if (result == NO_ERROR) {
876        float val;
877        if (sscanf(str8.string(), "%f", &val) == 1) {
878            value = val;
879        } else {
880            result = INVALID_OPERATION;
881        }
882    }
883    return result;
884}
885
886}; // namespace android
887
888