在Android中,有时候需要用到录音,我们大多录音是通过AudioRecoder获取,由于我之前云游戏项目中使用的NDK开发的,现在也把录音部分移到ndk去,感觉自己不喜欢去讲太多的道理,就喜欢上代码。。。
1.初始化引擎,以及设置回调
//1. 调用全局方法创建一个引擎对象(OpenSL ES唯一入口)
SLresult result = slCreateEngine(&engineObject, 0, NULL, 0, NULL, NULL);
if (SL_RESULT_SUCCESS != result) {
return;
}
//2. 实例化这个对象
result = (*engineObject)->Realize(engineObject, SL_BOOLEAN_FALSE);
if (SL_RESULT_SUCCESS != result) {
return;
}
//3. 从这个对象里面获取引擎接口
result = (*engineObject)->GetInterface(engineObject, SL_IID_ENGINE, &engineEngine);
if (SL_RESULT_SUCCESS != result) {
return;
}
//4. 设置IO设备(麦克风)
SLDataLocator_IODevice ioDevice = {
SL_DATALOCATOR_IODEVICE, //类型
SL_IODEVICE_AUDIOINPUT, //device类型 选择了音频输入类型
SL_DEFAULTDEVICEID_AUDIOINPUT, //deviceID
NULL //device实例
};
SLDataSource dataSource = {
&ioDevice, //SLDataLocator_IODevice配置输入
NULL //输入格式,采集的并不需要
};
//5. 设置输出buffer队列
SLDataLocator_AndroidSimpleBufferQueue buffer_queue = {
SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE, //类型 这里只能是这个常量
2 //buffer的数量
};
//6. 设置输出数据的格式
SLDataFormat_PCM pcmFormat = {
SL_DATAFORMAT_PCM, //输出PCM格式的数据
(SLuint32) channels, //输出的声道数量
SL_SAMPLINGRATE_44_1, //输出的采样频率,这里是44100Hz
SL_PCMSAMPLEFORMAT_FIXED_16, //输出的采样格式,这里是16bit
SL_PCMSAMPLEFORMAT_FIXED_16, //一般来说,跟随上一个参数
SL_SPEAKER_FRONT_LEFT |
SL_SPEAKER_FRONT_RIGHT, //双声道配置,如果单声道可以用 SL_SPEAKER_FRONT_CENTER
SL_BYTEORDER_LITTLEENDIAN //PCM数据的大小端排列
};
SLDataSink audioSink = {
&buffer_queue, //SLDataFormat_PCM配置输出
&pcmFormat //输出数据格式
};
SLAndroidSimpleBufferQueueItf recorderBufferQueue; //Buffer接口
//7. 创建录制的对象
const SLInterfaceID id[1] = {SL_IID_ANDROIDSIMPLEBUFFERQUEUE};
const SLboolean req[1] = {SL_BOOLEAN_TRUE};
result = (*engineEngine)->CreateAudioRecorder(engineEngine, //引擎接口
&recorderObject, //录制对象地址,用于传出对象
&dataSource, //输入配置
&audioSink, //输出配置
1, //支持的接口数量
id, //具体的要支持的接口
req //具体的要支持的接口是开放的还是关闭的
);
if (SL_RESULT_SUCCESS != result) {
return;
}
//8. 实例化这个录制对象
result = (*recorderObject)->Realize(recorderObject, SL_BOOLEAN_FALSE);
if (SL_RESULT_SUCCESS != result) {
return;
}
//9. 获取录制接口
(*recorderObject)->GetInterface(recorderObject, SL_IID_RECORD, &recorderRecorder);
//10. 获取Buffer接口
(*recorderObject)->GetInterface(recorderObject, SL_IID_ANDROIDSIMPLEBUFFERQUEUE,
&recorderBufferQueue);
finished = false;
result = (*recorderBufferQueue)->Enqueue(recorderBufferQueue, recordBuffer->getRecordBuffer(),
recorderSize);
if (SL_RESULT_SUCCESS != result) {
return;
}
result = (*recorderBufferQueue)->RegisterCallback(recorderBufferQueue, RecordCallback,
this);
if (SL_RESULT_SUCCESS != result) {
return;
}
//11. 开始录音
(*recorderRecorder)->SetRecordState(recorderRecorder, SL_RECORDSTATE_RECORDING);
2后面就是测试播放 :
/**
* 播放线程
*/
Runnable recordRunnable = new Runnable() {
@Override
public void run() {
try {
android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
byte[] tempBuffer = new byte[bufferSize];
int readCount = 0;
audioTrack.play();
mAudioStream = new DataInputStream(new FileInputStream(mPcmPath));
while (mAudioStream.available() > 0) {
readCount = mAudioStream.read(tempBuffer);
if (readCount == AudioTrack.ERROR_INVALID_OPERATION || readCount == AudioTrack.ERROR_BAD_VALUE) {
continue;
}
if (readCount != 0 && readCount != -1) {
audioTrack.write(tempBuffer, 0, readCount);
}
Log.d(TAG, "Play: " + readCount);
}
stopPlay();
} catch (Exception e) {
e.printStackTrace();
}
}
};
最后是连接 github地址 :传输门