DirectShow音频采集pcm，实时编码AAC，附源码

来源：互联网发布：windows 2008 r2 ad域编辑：程序博客网时间：2024/05/21 15:46

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/xiejiashuSite: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AACfaac_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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