C++ OpenAL:如何创建简单的;麦克风回声“;节目?
所以我想知道,从默认麦克风读取数据并输出到默认扬声器的最短开放式AL代码(以有效线路而言)是什么C++ OpenAL:如何创建简单的;麦克风回声“;节目?,c++,c,visual-studio-2008,audio,openal,C++,C,Visual Studio 2008,Audio,Openal,所以我想知道,从默认麦克风读取数据并输出到默认扬声器的最短开放式AL代码(以有效线路而言)是什么 我在VisualStudio2008下开发Windows7,这是一个古老的问题,但这里有一个答案。如果我们真的想要简洁,它肯定可以被删减,但这比100行有效行稍微少一点: #include <AL/al.h> // OpenAL header files #include <AL/alc.h> #include <list> using std::lis
我在VisualStudio2008下开发Windows7,这是一个古老的问题,但这里有一个答案。如果我们真的想要简洁,它肯定可以被删减,但这比100行有效行稍微少一点:
#include <AL/al.h> // OpenAL header files
#include <AL/alc.h>
#include <list>
using std::list;
#define FREQ 22050 // Sample rate
#define CAP_SIZE 2048 // How much to capture at a time (affects latency)
int main(int argC,char* argV[])
{
list<ALuint> bufferQueue; // A quick and dirty queue of buffer objects
ALenum errorCode=0;
ALuint helloBuffer[16], helloSource[1];
ALCdevice* audioDevice = alcOpenDevice(NULL); // Request default audio device
errorCode = alcGetError(audioDevice);
ALCcontext* audioContext = alcCreateContext(audioDevice,NULL); // Create the audio context
alcMakeContextCurrent(audioContext);
errorCode = alcGetError(audioDevice);
// Request the default capture device with a half-second buffer
ALCdevice* inputDevice = alcCaptureOpenDevice(NULL,FREQ,AL_FORMAT_MONO16,FREQ/2);
errorCode = alcGetError(inputDevice);
alcCaptureStart(inputDevice); // Begin capturing
errorCode = alcGetError(inputDevice);
alGenBuffers(16,&helloBuffer[0]); // Create some buffer-objects
errorCode = alGetError();
// Queue our buffers onto an STL list
for (int ii=0;ii<16;++ii) {
bufferQueue.push_back(helloBuffer[ii]);
}
alGenSources (1, &helloSource[0]); // Create a sound source
errorCode = alGetError();
short buffer[FREQ*2]; // A buffer to hold captured audio
ALCint samplesIn=0; // How many samples are captured
ALint availBuffers=0; // Buffers to be recovered
ALuint myBuff; // The buffer we're using
ALuint buffHolder[16]; // An array to hold catch the unqueued buffers
bool done = false;
while (!done) { // Main loop
// Poll for recoverable buffers
alGetSourcei(helloSource[0],AL_BUFFERS_PROCESSED,&availBuffers);
if (availBuffers>0) {
alSourceUnqueueBuffers(helloSource[0],availBuffers,buffHolder);
for (int ii=0;ii<availBuffers;++ii) {
// Push the recovered buffers back on the queue
bufferQueue.push_back(buffHolder[ii]);
}
}
// Poll for captured audio
alcGetIntegerv(inputDevice,ALC_CAPTURE_SAMPLES,1,&samplesIn);
if (samplesIn>CAP_SIZE) {
// Grab the sound
alcCaptureSamples(inputDevice,buffer,CAP_SIZE);
//***** Process/filter captured data here *****//
//for (int ii=0;ii<CAP_SIZE;++ii) {
// buffer[ii]*=0.1; // Make it quieter
//}
// Stuff the captured data in a buffer-object
if (!bufferQueue.empty()) { // We just drop the data if no buffers are available
myBuff = bufferQueue.front(); bufferQueue.pop_front();
alBufferData(myBuff,AL_FORMAT_MONO16,buffer,CAP_SIZE*sizeof(short),FREQ);
// Queue the buffer
alSourceQueueBuffers(helloSource[0],1,&myBuff);
// Restart the source if needed
// (if we take too long and the queue dries up,
// the source stops playing).
ALint sState=0;
alGetSourcei(helloSource[0],AL_SOURCE_STATE,&sState);
if (sState!=AL_PLAYING) {
alSourcePlay(helloSource[0]);
}
}
}
}
// Stop capture
alcCaptureStop(inputDevice);
alcCaptureCloseDevice(inputDevice);
// Stop the sources
alSourceStopv(1,&helloSource[0]);
for (int ii=0;ii<1;++ii) {
alSourcei(helloSource[ii],AL_BUFFER,0);
}
// Clean-up
alDeleteSources(1,&helloSource[0]);
alDeleteBuffers(16,&helloBuffer[0]);
errorCode = alGetError();
alcMakeContextCurrent(NULL);
errorCode = alGetError();
alcDestroyContext(audioContext);
alcCloseDevice(audioDevice);
return 0;
}
#包括//OpenAL头文件
#包括
#包括
使用std::list;
#定义频率22050//采样率
#定义CAP_大小2048//一次捕获多少(影响延迟)
int main(int argC,char*argV[])
{
list bufferQueue;//缓冲区对象的快速脏队列
ALenum errorCode=0;
ALuint helloBuffer[16],helloSource[1];
ALCdevice*audioDevice=AlcPenDevice(NULL);//请求默认音频设备
errorCode=alcGetError(音频设备);
ALCcontext*audioContext=alcCreateContext(audioDevice,NULL);//创建音频上下文
alcMakeContextCurrent(音频上下文);
errorCode=alcGetError(音频设备);
//请求具有半秒缓冲区的默认捕获设备
ALCdevice*inputDevice=alcCaptureOpenDevice(NULL,FREQ,AL_格式,FREQ/2);
errorCode=alcGetError(输入设备);
alcCaptureStart(inputDevice);//开始捕获
errorCode=alcGetError(输入设备);
alGenBuffers(16,&helloBuffer[0]);//创建一些缓冲区对象
errorCode=alGetError();
//将缓冲区排入STL列表
对于(int ii=0;iiI)推荐您使用我见过的OpenAL最干净的关机逻辑。大多数其他示例迫使OpenAL向SETER发出投诉缓冲区的大小不应该只是CAP_size
(或者CAP_size*2
如果录制立体声)?