AudioSystem.cpp revision c2f1f07084818942352c6bbfb36af9b6b330eb4e 
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, void *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, void *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 %p 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 %p, 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 %p, 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 %p, 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, void *param1, void *param2) {
352    LOGV("ioConfigChanged() event %d", event);
353    audio_io_handle_t ioHandle = (audio_io_handle_t)param1;
354    OutputDescriptor *desc;
355    uint32_t stream;
356
357    if (param1 == 0) return;
358
359    Mutex::Autolock _l(AudioSystem::gLock);
360
361    switch (event) {
362    case STREAM_CONFIG_CHANGED:
363        if (param2 == 0) break;
364        stream = *(uint32_t *)param2;
365        LOGV("ioConfigChanged() STREAM_CONFIG_CHANGED stream %d, output %p", stream, ioHandle);
366        if (gStreamOutputMap.indexOfKey(stream) >= 0) {
367            gStreamOutputMap.replaceValueFor(stream, ioHandle);
368        }
369        break;
370    case OUTPUT_OPENED: {
371        if (gOutputs.indexOfKey(ioHandle) >= 0) {
372            LOGV("ioConfigChanged() opening already existing output! %p", ioHandle);
373            break;
374        }
375        if (param2 == 0) break;
376        desc = (OutputDescriptor *)param2;
377
378        OutputDescriptor *outputDesc =  new OutputDescriptor(*desc);
379        gOutputs.add(ioHandle, outputDesc);
380        LOGV("ioConfigChanged() new output samplingRate %d, format %d channels %d frameCount %d latency %d",
381                outputDesc->samplingRate, outputDesc->format, outputDesc->channels, outputDesc->frameCount, outputDesc->latency);
382        } break;
383    case OUTPUT_CLOSED: {
384        if (gOutputs.indexOfKey(ioHandle) < 0) {
385            LOGW("ioConfigChanged() closing unknow output! %p", ioHandle);
386            break;
387        }
388        LOGV("ioConfigChanged() output %p closed", ioHandle);
389
390        gOutputs.removeItem(ioHandle);
391        for (int i = gStreamOutputMap.size() - 1; i >= 0 ; i--) {
392            if (gStreamOutputMap.valueAt(i) == ioHandle) {
393                gStreamOutputMap.removeItemsAt(i);
394            }
395        }
396        } break;
397
398    case OUTPUT_CONFIG_CHANGED: {
399        int index = gOutputs.indexOfKey(ioHandle);
400        if (index < 0) {
401            LOGW("ioConfigChanged() modifying unknow output! %p", ioHandle);
402            break;
403        }
404        if (param2 == 0) break;
405        desc = (OutputDescriptor *)param2;
406
407        LOGV("ioConfigChanged() new config for output %p samplingRate %d, format %d channels %d frameCount %d latency %d",
408                ioHandle, desc->samplingRate, desc->format,
409                desc->channels, desc->frameCount, desc->latency);
410        OutputDescriptor *outputDesc = gOutputs.valueAt(index);
411        delete outputDesc;
412        outputDesc =  new OutputDescriptor(*desc);
413        gOutputs.replaceValueFor(ioHandle, outputDesc);
414    } break;
415    case INPUT_OPENED:
416    case INPUT_CLOSED:
417    case INPUT_CONFIG_CHANGED:
418        break;
419
420    }
421}
422
423void AudioSystem::setErrorCallback(audio_error_callback cb) {
424    Mutex::Autolock _l(gLock);
425    gAudioErrorCallback = cb;
426}
427
428bool AudioSystem::routedToA2dpOutput(int streamType) {
429    switch(streamType) {
430    case MUSIC:
431    case VOICE_CALL:
432    case BLUETOOTH_SCO:
433    case SYSTEM:
434        return true;
435    default:
436        return false;
437    }
438}
439
440
441// client singleton for AudioPolicyService binder interface
442sp<IAudioPolicyService> AudioSystem::gAudioPolicyService;
443sp<AudioSystem::AudioPolicyServiceClient> AudioSystem::gAudioPolicyServiceClient;
444
445
446// establish binder interface to AudioFlinger service
447const sp<IAudioPolicyService>& AudioSystem::get_audio_policy_service()
448{
449    gLock.lock();
450    if (gAudioPolicyService.get() == 0) {
451        sp<IServiceManager> sm = defaultServiceManager();
452        sp<IBinder> binder;
453        do {
454            binder = sm->getService(String16("media.audio_policy"));
455            if (binder != 0)
456                break;
457            LOGW("AudioPolicyService not published, waiting...");
458            usleep(500000); // 0.5 s
459        } while(true);
460        if (gAudioPolicyServiceClient == NULL) {
461            gAudioPolicyServiceClient = new AudioPolicyServiceClient();
462        }
463        binder->linkToDeath(gAudioPolicyServiceClient);
464        gAudioPolicyService = interface_cast<IAudioPolicyService>(binder);
465        gLock.unlock();
466    } else {
467        gLock.unlock();
468    }
469    return gAudioPolicyService;
470}
471
472status_t AudioSystem::setDeviceConnectionState(audio_devices device,
473                                                  device_connection_state state,
474                                                  const char *device_address)
475{
476    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
477    if (aps == 0) return PERMISSION_DENIED;
478
479    return aps->setDeviceConnectionState(device, state, device_address);
480}
481
482AudioSystem::device_connection_state AudioSystem::getDeviceConnectionState(audio_devices device,
483                                                  const char *device_address)
484{
485    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
486    if (aps == 0) return DEVICE_STATE_UNAVAILABLE;
487
488    return aps->getDeviceConnectionState(device, device_address);
489}
490
491status_t AudioSystem::setPhoneState(int state)
492{
493    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
494    if (aps == 0) return PERMISSION_DENIED;
495
496    return aps->setPhoneState(state);
497}
498
499status_t AudioSystem::setRingerMode(uint32_t mode, uint32_t mask)
500{
501    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
502    if (aps == 0) return PERMISSION_DENIED;
503    return aps->setRingerMode(mode, mask);
504}
505
506status_t AudioSystem::setForceUse(force_use usage, forced_config config)
507{
508    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
509    if (aps == 0) return PERMISSION_DENIED;
510    return aps->setForceUse(usage, config);
511}
512
513AudioSystem::forced_config AudioSystem::getForceUse(force_use usage)
514{
515    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
516    if (aps == 0) return FORCE_NONE;
517    return aps->getForceUse(usage);
518}
519
520
521audio_io_handle_t AudioSystem::getOutput(stream_type stream,
522                                    uint32_t samplingRate,
523                                    uint32_t format,
524                                    uint32_t channels,
525                                    output_flags flags)
526{
527    audio_io_handle_t output = NULL;
528    if ((flags & AudioSystem::OUTPUT_FLAG_DIRECT) == 0) {
529        Mutex::Autolock _l(gLock);
530        output = AudioSystem::gStreamOutputMap.valueFor(stream);
531        LOGV_IF((output != NULL), "getOutput() read %p from cache for stream %d", output, stream);
532    }
533    if (output == NULL) {
534        const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
535        if (aps == 0) return NULL;
536        output = aps->getOutput(stream, samplingRate, format, channels, flags);
537        if ((flags & AudioSystem::OUTPUT_FLAG_DIRECT) == 0) {
538            Mutex::Autolock _l(gLock);
539            AudioSystem::gStreamOutputMap.add(stream, output);
540        }
541    }
542    return output;
543}
544
545status_t AudioSystem::startOutput(audio_io_handle_t output, AudioSystem::stream_type stream)
546{
547    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
548    if (aps == 0) return PERMISSION_DENIED;
549    return aps->startOutput(output, stream);
550}
551
552status_t AudioSystem::stopOutput(audio_io_handle_t output, AudioSystem::stream_type stream)
553{
554    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
555    if (aps == 0) return PERMISSION_DENIED;
556    return aps->stopOutput(output, stream);
557}
558
559void AudioSystem::releaseOutput(audio_io_handle_t output)
560{
561    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
562    if (aps == 0) return;
563    aps->releaseOutput(output);
564}
565
566audio_io_handle_t AudioSystem::getInput(int inputSource,
567                                    uint32_t samplingRate,
568                                    uint32_t format,
569                                    uint32_t channels,
570                                    audio_in_acoustics acoustics)
571{
572    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
573    if (aps == 0) return NULL;
574    return aps->getInput(inputSource, samplingRate, format, channels, acoustics);
575}
576
577status_t AudioSystem::startInput(audio_io_handle_t input)
578{
579    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
580    if (aps == 0) return PERMISSION_DENIED;
581    return aps->startInput(input);
582}
583
584status_t AudioSystem::stopInput(audio_io_handle_t input)
585{
586    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
587    if (aps == 0) return PERMISSION_DENIED;
588    return aps->stopInput(input);
589}
590
591void AudioSystem::releaseInput(audio_io_handle_t input)
592{
593    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
594    if (aps == 0) return;
595    aps->releaseInput(input);
596}
597
598status_t AudioSystem::initStreamVolume(stream_type stream,
599                                    int indexMin,
600                                    int indexMax)
601{
602    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
603    if (aps == 0) return PERMISSION_DENIED;
604    return aps->initStreamVolume(stream, indexMin, indexMax);
605}
606
607status_t AudioSystem::setStreamVolumeIndex(stream_type stream, int index)
608{
609    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
610    if (aps == 0) return PERMISSION_DENIED;
611    return aps->setStreamVolumeIndex(stream, index);
612}
613
614status_t AudioSystem::getStreamVolumeIndex(stream_type stream, int *index)
615{
616    const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service();
617    if (aps == 0) return PERMISSION_DENIED;
618    return aps->getStreamVolumeIndex(stream, index);
619}
620
621// ---------------------------------------------------------------------------
622
623void AudioSystem::AudioPolicyServiceClient::binderDied(const wp<IBinder>& who) {
624    Mutex::Autolock _l(AudioSystem::gLock);
625    AudioSystem::gAudioPolicyService.clear();
626
627    LOGW("AudioPolicyService server died!");
628}
629
630// ---------------------------------------------------------------------------
631
632
633// use emulated popcount optimization
634// http://www.df.lth.se/~john_e/gems/gem002d.html
635uint32_t AudioSystem::popCount(uint32_t u)
636{
637    u = ((u&0x55555555) + ((u>>1)&0x55555555));
638    u = ((u&0x33333333) + ((u>>2)&0x33333333));
639    u = ((u&0x0f0f0f0f) + ((u>>4)&0x0f0f0f0f));
640    u = ((u&0x00ff00ff) + ((u>>8)&0x00ff00ff));
641    u = ( u&0x0000ffff) + (u>>16);
642    return u;
643}
644
645bool AudioSystem::isOutputDevice(audio_devices device)
646{
647    if ((popCount(device) == 1 ) &&
648        ((device & ~AudioSystem::DEVICE_OUT_ALL) == 0)) {
649        return true;
650    } else {
651        return false;
652    }
653}
654
655bool AudioSystem::isInputDevice(audio_devices device)
656{
657    if ((popCount(device) == 1 ) &&
658        ((device & ~AudioSystem::DEVICE_IN_ALL) == 0)) {
659        return true;
660    } else {
661        return false;
662    }
663}
664
665bool AudioSystem::isA2dpDevice(audio_devices device)
666{
667    if ((popCount(device) == 1 ) &&
668        (device & (AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP |
669                   AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES |
670                   AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER))) {
671        return true;
672    } else {
673        return false;
674    }
675}
676
677bool AudioSystem::isBluetoothScoDevice(audio_devices device)
678{
679    if ((popCount(device) == 1 ) &&
680        (device & (AudioSystem::DEVICE_OUT_BLUETOOTH_SCO |
681                   AudioSystem::DEVICE_OUT_BLUETOOTH_SCO_HEADSET |
682                   AudioSystem::DEVICE_OUT_BLUETOOTH_SCO_CARKIT))) {
683        return true;
684    } else {
685        return false;
686    }
687}
688
689bool AudioSystem::isLowVisibility(stream_type stream)
690{
691    if (stream == AudioSystem::SYSTEM || stream == AudioSystem::NOTIFICATION) {
692        return true;
693    } else {
694        return false;
695    }
696}
697
698bool AudioSystem::isInputChannel(uint32_t channel)
699{
700    if ((channel & ~AudioSystem::CHANNEL_IN_ALL) == 0) {
701        return true;
702    } else {
703        return false;
704    }
705}
706
707bool AudioSystem::isOutputChannel(uint32_t channel)
708{
709    if ((channel & ~AudioSystem::CHANNEL_OUT_ALL) == 0) {
710        return true;
711    } else {
712        return false;
713    }
714}
715
716bool AudioSystem::isValidFormat(uint32_t format)
717{
718    switch (format & MAIN_FORMAT_MASK) {
719    case         PCM:
720    case         MP3:
721    case         AMR_NB:
722    case         AMR_WB:
723    case         AAC:
724    case         HE_AAC_V1:
725    case         HE_AAC_V2:
726    case         VORBIS:
727        return true;
728    default:
729        return false;
730    }
731}
732
733bool AudioSystem::isLinearPCM(uint32_t format)
734{
735    switch (format) {
736    case         PCM_16_BIT:
737    case         PCM_8_BIT:
738        return true;
739    default:
740        return false;
741    }
742}
743
744//------------------------- AudioParameter class implementation ---------------
745
746const char *AudioParameter::keyRouting = "routing";
747const char *AudioParameter::keySamplingRate = "sampling_rate";
748const char *AudioParameter::keyFormat = "format";
749const char *AudioParameter::keyChannels = "channels";
750const char *AudioParameter::keyFrameCount = "frame_count";
751
752AudioParameter::AudioParameter(const String8& keyValuePairs)
753{
754    char *str = new char[keyValuePairs.length()+1];
755    mKeyValuePairs = keyValuePairs;
756
757    strcpy(str, keyValuePairs.string());
758    char *pair = strtok(str, ";");
759    while (pair != NULL) {
760        if (strlen(pair) != 0) {
761            size_t eqIdx = strcspn(pair, "=");
762            String8 key = String8(pair, eqIdx);
763            String8 value;
764            if (eqIdx == strlen(pair)) {
765                value = String8("");
766            } else {
767                value = String8(pair + eqIdx + 1);
768            }
769            if (mParameters.indexOfKey(key) < 0) {
770                mParameters.add(key, value);
771            } else {
772                mParameters.replaceValueFor(key, value);
773            }
774        } else {
775            LOGV("AudioParameter() cstor empty key value pair");
776        }
777        pair = strtok(NULL, ";");
778    }
779
780    delete[] str;
781}
782
783AudioParameter::~AudioParameter()
784{
785    mParameters.clear();
786}
787
788String8 AudioParameter::toString()
789{
790    String8 str = String8("");
791
792    size_t size = mParameters.size();
793    for (size_t i = 0; i < size; i++) {
794        str += mParameters.keyAt(i);
795        str += "=";
796        str += mParameters.valueAt(i);
797        if (i < (size - 1)) str += ";";
798    }
799    return str;
800}
801
802status_t AudioParameter::add(const String8& key, const String8& value)
803{
804    if (mParameters.indexOfKey(key) < 0) {
805        mParameters.add(key, value);
806        return NO_ERROR;
807    } else {
808        mParameters.replaceValueFor(key, value);
809        return ALREADY_EXISTS;
810    }
811}
812
813status_t AudioParameter::addInt(const String8& key, const int value)
814{
815    char str[12];
816    if (snprintf(str, 12, "%d", value) > 0) {
817        String8 str8 = String8(str);
818        return add(key, str8);
819    } else {
820        return BAD_VALUE;
821    }
822}
823
824status_t AudioParameter::addFloat(const String8& key, const float value)
825{
826    char str[23];
827    if (snprintf(str, 23, "%.10f", value) > 0) {
828        String8 str8 = String8(str);
829        return add(key, str8);
830    } else {
831        return BAD_VALUE;
832    }
833}
834
835status_t AudioParameter::remove(const String8& key)
836{
837    if (mParameters.indexOfKey(key) >= 0) {
838        mParameters.removeItem(key);
839        return NO_ERROR;
840    } else {
841        return BAD_VALUE;
842    }
843}
844
845status_t AudioParameter::get(const String8& key, String8& value)
846{
847    if (mParameters.indexOfKey(key) >= 0) {
848        value = mParameters.valueFor(key);
849        return NO_ERROR;
850    } else {
851        return BAD_VALUE;
852    }
853}
854
855status_t AudioParameter::getInt(const String8& key, int& value)
856{
857    String8 str8;
858    status_t result = get(key, str8);
859    value = 0;
860    if (result == NO_ERROR) {
861        int val;
862        if (sscanf(str8.string(), "%d", &val) == 1) {
863            value = val;
864        } else {
865            result = INVALID_OPERATION;
866        }
867    }
868    return result;
869}
870
871status_t AudioParameter::getFloat(const String8& key, float& value)
872{
873    String8 str8;
874    status_t result = get(key, str8);
875    value = 0;
876    if (result == NO_ERROR) {
877        float val;
878        if (sscanf(str8.string(), "%f", &val) == 1) {
879            value = val;
880        } else {
881            result = INVALID_OPERATION;
882        }
883    }
884    return result;
885}
886
887}; // namespace android
888
889