AudioSystem.cpp revision 7562408b2261d38415453378b6188f74fda99d88 
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 <math.h>
24
25namespace android {
26
27// client singleton for AudioFlinger binder interface
28Mutex AudioSystem::gLock;
29sp<IAudioFlinger> AudioSystem::gAudioFlinger;
30sp<AudioSystem::AudioFlingerClient> AudioSystem::gAudioFlingerClient;
31audio_error_callback AudioSystem::gAudioErrorCallback = NULL;
32// Cached values
33int AudioSystem::gOutSamplingRate[NUM_AUDIO_OUTPUT_TYPES];
34int AudioSystem::gOutFrameCount[NUM_AUDIO_OUTPUT_TYPES];
35uint32_t AudioSystem::gOutLatency[NUM_AUDIO_OUTPUT_TYPES];
36bool AudioSystem::gA2dpEnabled;
37// Cached values for recording queries
38uint32_t AudioSystem::gPrevInSamplingRate = 16000;
39int AudioSystem::gPrevInFormat = AudioSystem::PCM_16_BIT;
40int AudioSystem::gPrevInChannelCount = 1;
41size_t AudioSystem::gInBuffSize = 0;
42
43
44// establish binder interface to AudioFlinger service
45const sp<IAudioFlinger>& AudioSystem::get_audio_flinger()
46{
47    Mutex::Autolock _l(gLock);
48    if (gAudioFlinger.get() == 0) {
49        sp<IServiceManager> sm = defaultServiceManager();
50        sp<IBinder> binder;
51        do {
52            binder = sm->getService(String16("media.audio_flinger"));
53            if (binder != 0)
54                break;
55            LOGW("AudioFlinger not published, waiting...");
56            usleep(500000); // 0.5 s
57        } while(true);
58        if (gAudioFlingerClient == NULL) {
59            gAudioFlingerClient = new AudioFlingerClient();
60        } else {
61            if (gAudioErrorCallback) {
62                gAudioErrorCallback(NO_ERROR);
63            }
64         }
65        binder->linkToDeath(gAudioFlingerClient);
66        gAudioFlinger = interface_cast<IAudioFlinger>(binder);
67        gAudioFlinger->registerClient(gAudioFlingerClient);
68        // Cache frequently accessed parameters
69        for (int output = 0; output < NUM_AUDIO_OUTPUT_TYPES; output++) {
70            gOutFrameCount[output] = (int)gAudioFlinger->frameCount(output);
71            gOutSamplingRate[output] = (int)gAudioFlinger->sampleRate(output);
72            gOutLatency[output] = gAudioFlinger->latency(output);
73        }
74        gA2dpEnabled = gAudioFlinger->isA2dpEnabled();
75    }
76    LOGE_IF(gAudioFlinger==0, "no AudioFlinger!?");
77    return gAudioFlinger;
78}
79
80// routing helper functions
81status_t AudioSystem::speakerphone(bool state) {
82    uint32_t routes = state ? ROUTE_SPEAKER : ROUTE_EARPIECE;
83    return setRouting(MODE_IN_CALL, routes, ROUTE_ALL);
84}
85
86status_t AudioSystem::isSpeakerphoneOn(bool* state) {
87    uint32_t routes = 0;
88    status_t s = getRouting(MODE_IN_CALL, &routes);
89    *state = !!(routes & ROUTE_SPEAKER);
90    return s;
91}
92
93status_t AudioSystem::bluetoothSco(bool state) {
94    uint32_t mask = ROUTE_BLUETOOTH_SCO;
95    uint32_t routes = state ? mask : ROUTE_EARPIECE;
96    return setRouting(MODE_IN_CALL, routes, ROUTE_ALL);
97}
98
99status_t AudioSystem::isBluetoothScoOn(bool* state) {
100    uint32_t routes = 0;
101    status_t s = getRouting(MODE_IN_CALL, &routes);
102    *state = !!(routes & ROUTE_BLUETOOTH_SCO);
103    return s;
104}
105
106status_t AudioSystem::muteMicrophone(bool state) {
107    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
108    if (af == 0) return PERMISSION_DENIED;
109    return af->setMicMute(state);
110}
111
112status_t AudioSystem::isMicrophoneMuted(bool* state) {
113    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
114    if (af == 0) return PERMISSION_DENIED;
115    *state = af->getMicMute();
116    return NO_ERROR;
117}
118
119status_t AudioSystem::setMasterVolume(float value)
120{
121    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
122    if (af == 0) return PERMISSION_DENIED;
123    af->setMasterVolume(value);
124    return NO_ERROR;
125}
126
127status_t AudioSystem::setMasterMute(bool mute)
128{
129    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
130    if (af == 0) return PERMISSION_DENIED;
131    af->setMasterMute(mute);
132    return NO_ERROR;
133}
134
135status_t AudioSystem::getMasterVolume(float* volume)
136{
137    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
138    if (af == 0) return PERMISSION_DENIED;
139    *volume = af->masterVolume();
140    return NO_ERROR;
141}
142
143status_t AudioSystem::getMasterMute(bool* mute)
144{
145    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
146    if (af == 0) return PERMISSION_DENIED;
147    *mute = af->masterMute();
148    return NO_ERROR;
149}
150
151status_t AudioSystem::setStreamVolume(int stream, float value)
152{
153    if (uint32_t(stream) >= NUM_STREAM_TYPES) return BAD_VALUE;
154    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
155    if (af == 0) return PERMISSION_DENIED;
156    af->setStreamVolume(stream, value);
157    return NO_ERROR;
158}
159
160status_t AudioSystem::setStreamMute(int stream, bool mute)
161{
162    if (uint32_t(stream) >= NUM_STREAM_TYPES) return BAD_VALUE;
163    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
164    if (af == 0) return PERMISSION_DENIED;
165    af->setStreamMute(stream, mute);
166    return NO_ERROR;
167}
168
169status_t AudioSystem::getStreamVolume(int stream, float* volume)
170{
171    if (uint32_t(stream) >= NUM_STREAM_TYPES) return BAD_VALUE;
172    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
173    if (af == 0) return PERMISSION_DENIED;
174    *volume = af->streamVolume(stream);
175    return NO_ERROR;
176}
177
178status_t AudioSystem::getStreamMute(int stream, bool* mute)
179{
180    if (uint32_t(stream) >= NUM_STREAM_TYPES) return BAD_VALUE;
181    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
182    if (af == 0) return PERMISSION_DENIED;
183    *mute = af->streamMute(stream);
184    return NO_ERROR;
185}
186
187status_t AudioSystem::setMode(int mode)
188{
189    if (mode >= NUM_MODES) return BAD_VALUE;
190    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
191    if (af == 0) return PERMISSION_DENIED;
192    return af->setMode(mode);
193}
194
195status_t AudioSystem::getMode(int* mode)
196{
197    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
198    if (af == 0) return PERMISSION_DENIED;
199    *mode = af->getMode();
200    return NO_ERROR;
201}
202
203status_t AudioSystem::setRouting(int mode, uint32_t routes, uint32_t mask)
204{
205    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
206    if (af == 0) return PERMISSION_DENIED;
207    return af->setRouting(mode, routes, mask);
208}
209
210status_t AudioSystem::getRouting(int mode, uint32_t* routes)
211{
212    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
213    if (af == 0) return PERMISSION_DENIED;
214    uint32_t r = af->getRouting(mode);
215    *routes = r;
216    return NO_ERROR;
217}
218
219status_t AudioSystem::isMusicActive(bool* state) {
220    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
221    if (af == 0) return PERMISSION_DENIED;
222    *state = af->isMusicActive();
223    return NO_ERROR;
224}
225
226// Temporary interface, do not use
227// TODO: Replace with a more generic key:value get/set mechanism
228status_t AudioSystem::setParameter(const char* key, const char* value) {
229    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
230    if (af == 0) return PERMISSION_DENIED;
231    return af->setParameter(key, value);
232}
233
234// convert volume steps to natural log scale
235
236// change this value to change volume scaling
237static const float dBPerStep = 0.5f;
238// shouldn't need to touch these
239static const float dBConvert = -dBPerStep * 2.302585093f / 20.0f;
240static const float dBConvertInverse = 1.0f / dBConvert;
241
242float AudioSystem::linearToLog(int volume)
243{
244    // float v = volume ? exp(float(100 - volume) * dBConvert) : 0;
245    // LOGD("linearToLog(%d)=%f", volume, v);
246    // return v;
247    return volume ? exp(float(100 - volume) * dBConvert) : 0;
248}
249
250int AudioSystem::logToLinear(float volume)
251{
252    // int v = volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
253    // LOGD("logTolinear(%d)=%f", v, volume);
254    // return v;
255    return volume ? 100 - int(dBConvertInverse * log(volume) + 0.5) : 0;
256}
257
258status_t AudioSystem::getOutputSamplingRate(int* samplingRate, int streamType)
259{
260    int output = getOutput(streamType);
261
262    if (output == NUM_AUDIO_OUTPUT_TYPES) return PERMISSION_DENIED;
263
264    // gOutSamplingRate[] is updated by getOutput() which calls get_audio_flinger()
265    LOGV("getOutputSamplingRate() streamType %d, output %d, sampling rate %d", streamType, output, gOutSamplingRate[output]);
266
267    *samplingRate = gOutSamplingRate[output];
268
269    return NO_ERROR;
270}
271
272status_t AudioSystem::getOutputFrameCount(int* frameCount, int streamType)
273{
274    int output = getOutput(streamType);
275
276    if (output == NUM_AUDIO_OUTPUT_TYPES) return PERMISSION_DENIED;
277
278    // gOutFrameCount[] is updated by getOutput() which calls get_audio_flinger()
279    LOGV("getOutputFrameCount() streamType %d, output %d, frame count %d", streamType, output, gOutFrameCount[output]);
280
281    *frameCount = gOutFrameCount[output];
282
283    return NO_ERROR;
284}
285
286status_t AudioSystem::getOutputLatency(uint32_t* latency, int streamType)
287{
288    int output = getOutput(streamType);
289
290    if (output == NUM_AUDIO_OUTPUT_TYPES) return PERMISSION_DENIED;
291
292    // gOutLatency[] is updated by getOutput() which calls get_audio_flinger()
293    LOGV("getOutputLatency() streamType %d, output %d, latency %d", streamType, output, gOutLatency[output]);
294
295    *latency = gOutLatency[output];
296
297    return NO_ERROR;
298}
299
300status_t AudioSystem::getInputBufferSize(uint32_t sampleRate, int format, int channelCount,
301    size_t* buffSize)
302{
303    // Do we have a stale gInBufferSize or are we requesting the input buffer size for new values
304    if ((gInBuffSize == 0) || (sampleRate != gPrevInSamplingRate) || (format != gPrevInFormat)
305        || (channelCount != gPrevInChannelCount)) {
306        // save the request params
307        gPrevInSamplingRate = sampleRate;
308        gPrevInFormat = format;
309        gPrevInChannelCount = channelCount;
310
311        gInBuffSize = 0;
312        const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
313        if (af == 0) {
314            return PERMISSION_DENIED;
315        }
316        gInBuffSize = af->getInputBufferSize(sampleRate, format, channelCount);
317    }
318    *buffSize = gInBuffSize;
319
320    return NO_ERROR;
321}
322
323// ---------------------------------------------------------------------------
324
325void AudioSystem::AudioFlingerClient::binderDied(const wp<IBinder>& who) {
326    Mutex::Autolock _l(AudioSystem::gLock);
327    AudioSystem::gAudioFlinger.clear();
328
329    for (int output = 0; output < NUM_AUDIO_OUTPUT_TYPES; output++) {
330        gOutFrameCount[output] = 0;
331        gOutSamplingRate[output] = 0;
332        gOutLatency[output] = 0;
333    }
334    AudioSystem::gInBuffSize = 0;
335
336    if (gAudioErrorCallback) {
337        gAudioErrorCallback(DEAD_OBJECT);
338    }
339    LOGW("AudioFlinger server died!");
340}
341
342void AudioSystem::AudioFlingerClient::a2dpEnabledChanged(bool enabled) {
343    gA2dpEnabled = enabled;
344    LOGV("AudioFlinger A2DP enabled status changed! %d", enabled);
345}
346
347void AudioSystem::setErrorCallback(audio_error_callback cb) {
348    Mutex::Autolock _l(AudioSystem::gLock);
349    gAudioErrorCallback = cb;
350}
351
352int AudioSystem::getOutput(int streamType)
353{
354    // make sure that gA2dpEnabled is valid by calling get_audio_flinger() which in turn
355    // will call gAudioFlinger->isA2dpEnabled()
356    const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
357    if (af == 0) return NUM_AUDIO_OUTPUT_TYPES;
358
359    if (streamType == DEFAULT) {
360        streamType = MUSIC;
361    }
362    if (gA2dpEnabled && routedToA2dpOutput(streamType)) {
363        return AUDIO_OUTPUT_A2DP;
364    } else {
365        return AUDIO_OUTPUT_HARDWARE;
366    }
367}
368
369bool AudioSystem::routedToA2dpOutput(int streamType) {
370    switch(streamType) {
371    case MUSIC:
372    case VOICE_CALL:
373    case BLUETOOTH_SCO:
374    case SYSTEM:
375        return true;
376    default:
377        return false;
378    }
379}
380
381
382
383}; // namespace android
384
385