音频采集编码pcm到aac

实现获取pc上接入的音频输入设备，并采集音频输入设备音频数据（pcm），然后基于libfaac进行编码，最终生成aac文件。

/*
	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
#include
#include
#include
#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（fSamplingFrequencyfNumChannelsfBitsPerSample）; //初始化AAC编码器

	ds_capture_ = new DSCapture（）;
	std::map 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::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（outbuf1buf_sizef_aac_）;
			}			
		}
		// 释放采集的pcm数据
		ds_capture_->ReleaseBuffer（pcmBuf）;	
		::Sleep（1）;
	}

	free（outbuf）;
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件        887  2013-09-22 17:35  WinAudioRecord\AudioRecord.sln

     文件       5769  2013-09-23 15:10  WinAudioRecord\AudioRecord.vcproj

     文件     131072  2013-07-21 22:50  WinAudioRecord\Debug\libfaacd.dll

     文件        631  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\activecf.h

     文件       1826  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\amaudio.h

     文件       1065  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\amparse.h

     文件      73261  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\amstream.h

     文件       3974  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\amva.h

     文件      19851  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\Amvideo.h

     文件       1097  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\atsmedia.h

     文件       1532  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\audevcod.h

     文件      20543  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\austream.h

     文件      13805  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\aviriff.h

     文件       6861  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\basetsd.h

     文件     125594  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\bdaiface.h

     文件      54539  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\bdamedia.h

     文件      53527  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\Bdatif.h

     文件      15486  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\bdatypes.h

     文件        944  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\comlite.h

     文件     178266  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\control.h

     文件      88071  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\d3d.h

     文件      72232  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\d3d8.h

     文件      16088  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\d3d8caps.h

     文件      63735  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\d3d8types.h

     文件      96132  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\d3d9.h

     文件      22164  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\d3d9caps.h

     文件      69800  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\d3d9types.h

     文件      26113  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\d3dcaps.h

     文件      14874  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\d3drm.h

     文件      24261  2013-07-21 22:54  WinAudioRecord\DirectShow\Include\d3drmdef.h

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