[英]How to record live audio input into file from microphone with openAL? (C++ code inside)
我有这样的代码用于在Windows上使用openAL进行麦克风回声。
我想创建一些CapturedAudioData
文件来写入循环期间捕获的所有音频数据。 所以它就像未经格式化的PCM。 我需要每秒填充25次。
#include "stdafx.h"
#include <iostream>
#include <stdio.h>
#include <windows.h>
#include <al.h>
#include <alc.h>
using namespace std;
int main()
{
ALCdevice *dev[2];
ALCcontext *ctx;
ALuint source, buffers[3];
char data[5000];
ALuint buf;
ALint val;
dev[0] = alcOpenDevice(NULL);
ctx = alcCreateContext(dev[0], NULL);
alcMakeContextCurrent(ctx);
alGenSources(1, &source);
alGenBuffers(3, buffers);
/* Setup some initial silent data to play out of the source */
alBufferData(buffers[0], AL_FORMAT_MONO16, data, sizeof(data), 22050);
alBufferData(buffers[1], AL_FORMAT_MONO16, data, sizeof(data), 22050);
alBufferData(buffers[2], AL_FORMAT_MONO16, data, sizeof(data), 22050);
alSourceQueueBuffers(source, 3, buffers);
/* If you don't need 3D spatialization, this should help processing time */
alDistanceModel(AL_NONE);
dev[1] = alcCaptureOpenDevice(NULL, 22050, AL_FORMAT_MONO16, sizeof(data)/2);
/* Start playback and capture, and enter the audio loop */
alSourcePlay(source);
alcCaptureStart(dev[1]);
while(1)
{
/* Check if any queued buffers are finished */
alGetSourcei(source, AL_BUFFERS_PROCESSED, &val);
if(val <= 0)
continue;
/* Check how much audio data has been captured (note that 'val' is the
* number of frames, not bytes) */
alcGetIntegerv(dev[1], ALC_CAPTURE_SAMPLES, 1, &val);
/* Read the captured audio */
alcCaptureSamples(dev[1], data, val);
/* Pop the oldest finished buffer, fill it with the new capture data,
then re-queue it to play on the source */
alSourceUnqueueBuffers(source, 1, &buf);
alBufferData(buf, AL_FORMAT_MONO16, data, val*2 /* bytes here, not
frames */, 22050);
alSourceQueueBuffers(source, 1, &buf);
/* Make sure the source is still playing */
alGetSourcei(source, AL_SOURCE_STATE, &val);
if(val != AL_PLAYING)
{
alSourcePlay(source);
}
}
/* Shutdown and cleanup */
alcCaptureStop(dev[1]);
alcCaptureCloseDevice(dev[1]);
alSourceStop(source);
alDeleteSources(1, &source);
alDeleteBuffers(3, buffers);
alcMakeContextCurrent(NULL);
alcDestroyContext(ctx);
alcCloseDevice(dev[0]);
return 0;
}
如何创建这样的东西 - 我必须更改/添加到我的代码?
看来你需要做的就是将data
缓冲区中的val
样本写入文件,而不是将它们发送到输出。 即用文件写入替换以“Pop the oldest ...”开头的代码。 计算您编写的样本:每当达到(25秒* 22050样本/秒)值时,它就会“填满”。
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