Android怎么实现4声道录音
时间: 2024-05-12 13:15:44 浏览: 16
Android系统默认支持双声道录音,如果需要实现4声道录音,可以使用OpenSL ES来实现。
OpenSL ES是一种跨平台的音频API,可以用来实现低延迟的音频处理和播放。以下是实现4声道录音的大致步骤:
1. 创建OpenSL ES引擎和音频录制器对象。
```
SLObjectItf engineObj;
SLEngineItf engine;
SLObjectItf recorderObj;
SLRecordItf recorder;
```
2. 配置音频录制器的参数,包括采样率、声道数、采样位数等。
```
SLDataLocator_IODevice loc_dev = {SL_DATALOCATOR_IODEVICE, SL_IODEVICE_AUDIOINPUT, SL_DEFAULTDEVICEID_AUDIOINPUT, NULL};
SLDataSource audioSrc = {&loc_dev, NULL};
SLuint32 channelMask = SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT | SL_SPEAKER_BACK_LEFT | SL_SPEAKER_BACK_RIGHT;
SLuint32 numChannels = 4;
SLDataLocator_AndroidSimpleBufferQueue loc_bq = {SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE, 2};
SLDataFormat_PCM format_pcm = {SL_DATAFORMAT_PCM, numChannels, SL_SAMPLINGRATE_44_1, SL_PCMSAMPLEFORMAT_FIXED_16, SL_PCMSAMPLEFORMAT_FIXED_16, channelMask, SL_BYTEORDER_LITTLEENDIAN};
SLDataSink audioSink = {&loc_bq, &format_pcm};
const SLInterfaceID id[1] = {SL_IID_ANDROIDSIMPLEBUFFERQUEUE};
const SLboolean req[1] = {SL_BOOLEAN_TRUE};
(*recorderObj)->GetInterface(recorderObj, SL_IID_RECORD, &recorder);
(*recorderObj)->GetInterface(recorderObj, SL_IID_ANDROIDCONFIGURATION, &configItf);
(*configItf)->SetConfiguration(configItf, SL_ANDROID_KEY_RECORDING_PRESET, &preset, sizeof(SLuint32));
(*recorder)->SetRecordState(recorder, SL_RECORDSTATE_STOPPED);
(*recorder)->SetMarkerPosition(recorder, 2000);
(*recorder)->SetPositionUpdatePeriod(recorder, 1000);
(*recorder)->SetCallback(recorder, recorderCallback, NULL);
(*recorder)->SetDeviceChangeCallback(recorder, recorderDeviceChangeCallback, NULL);
(*recorder)->SetQueuePeriodSize(recorder, format_pcm.samplesPerSec * format_pcm.numChannels * 2 / 50);
```
3. 开始录制音频数据。
```
(*recorder)->SetRecordState(recorder, SL_RECORDSTATE_RECORDING);
```
4. 实现回调函数来处理录制的音频数据。
```
void recorderCallback(SLRecordItf caller, void *pContext, SLuint32 event){
if(event & SL_RECORDEVENT_BUFFER_FULL){
SLAndroidSimpleBufferQueueState state;
(*recorderBufferQueue)->GetState(recorderBufferQueue, &state);
if(state.count == 2){
return;
}
SLresult result = (*recorderBufferQueue)->Enqueue(recorderBufferQueue, buffer, bufferSize);
if(result != SL_RESULT_SUCCESS){
return;
}
}
}
```
以上是大致的实现步骤,具体细节可以参考OpenSL ES的文档或者代码示例。
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