DirectShow音频采集pcm，实时编码AAC，附源码

定期送福利，今天给大家送上Windows中利用DirectShow采集microphone音频，并将采集到的pcm数据，利用FAAC库编码成AAC，进行本地存储或者网络传输。



直接贴代码，解析看注释：

/*
功能描述：	简单实现用DirectShow采集Windows麦克风音频PCM数据
经过FAAC编码成AAC存储文件，可根据项目修改成直播，对讲
等实时传输类应用。

From：	 http://blog.csdn.net/xiejiashu Site:	 http://www.easydarwin.org 时间：		2014/07/28
*/
#include "../DSAudio/General.h"
#include<iostream>
#include<cstring>
#include<windows.h>
#include<conio.h>
#include "../DSAudio/dscapture.h"
#include "DSAudio/FAACEncoder.h"

unsigned char fBitsPerSample, fNumChannels;
unsigned fSamplingFrequency;
unsigned fGranularityInMS;

DSCapture* ds_capture_;
FAACEncoder* faac_encoder_;

unsigned long max_out_bytes;
unsigned char* outbuf;

FILE* f_aac_;

int main()
{

fBitsPerSample = 16; //单个采样音频信息位数
fNumChannels = 2; //通道数
fSamplingFrequency = 44100;//采样率

faac_encoder_ = new FAACEncoder(); //新建AAC编码对象

faac_encoder_->Init(fSamplingFrequency,fNumChannels,fBitsPerSample); //初始化AAC编码器

ds_capture_ = new DSCapture();
std::map<CString, CString> a_devices = ds_capture_->DShowGraph()->AudioCapDevices();

if(a_devices.size() == 0 ) ::exit(0);

DSAudioFormat audio_fmt;
audio_fmt.samples_per_sec = fSamplingFrequency;
audio_fmt.channels = fNumChannels;
audio_fmt.bits_per_sample = fBitsPerSample;

// 枚举音频采样设备，选择最后一个
CString audio_device_id;
for (std::map<CString, CString>::iterator it = a_devices.begin(); it != a_devices.end(); ++it)
{
audio_device_id = it->first;
}

ds_capture_->Create(audio_device_id, audio_fmt, NULL);

// 开始采集音频数据
ds_capture_->StartAudio();

::Sleep(10);

max_out_bytes = faac_encoder_->MaxOutBytes();
outbuf = (unsigned char*)malloc(max_out_bytes);

// 编码后存文件
f_aac_ = fopen("./audio.aac","wb");
printf("Recording...");
while(1)
{
int pcmLen = 0;
// 采集音频pcm数据
char* pcmBuf = ds_capture_->GetBuffer(pcmLen);
if(pcmLen > 0)
{
unsigned int sample_count = (pcmLen << 3)/fBitsPerSample;
unsigned int buf_size = 0;
// 编码AAC
faac_encoder_->Encode((unsigned char*)pcmBuf, sample_count, (unsigned char*)outbuf, buf_size);
if(buf_size > 0)
{
printf(".");
// 存文件或者自定义
fwrite(outbuf,1,buf_size,f_aac_);
}
}
// 释放采集的pcm数据
ds_capture_->ReleaseBuffer(pcmBuf);
::Sleep(1);
}

free(outbuf);
}

源码下载：http://pan.baidu.com/s/1kTj05Fp

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