读写WAVE文件

[leixue1997]

如何用C++写一个写WAVE文件的程序？？求各位高手指点一下，，有源代码就更好了，，，希望是简单易懂的那种哈

[lizhigang34]

你先要了解WAVE文件格式是什么样的，下面这个函数是在WIM_DATA时响应。

void CAudioRecorder::onWimData(PWAVEHDR pWaveHdr)
{

	m_dwDataLength += pWaveHdr->dwBytesRecorded;


	/*
	RIFF WAVE Chun 12
	==================================
	|       |所占字节数|  具体内容   |
	==================================
	| ID    |  4 Bytes |   'RIFF'    |
	----------------------------------
	| Size  |  4 Bytes |             |
	----------------------------------
	| Type  |  4 Bytes |   'WAVE'    |
	----------------------------------
	*/
	/*
	Format Chunk 26
	====================================================================
	|               |   字节数  |              具体内容                |
	====================================================================
	| ID            |  4 Bytes  |   'fmt '                             |
	--------------------------------------------------------------------
	| Size          |  4 Bytes  | 数值为16或18，18则最后又附加信息     |
	--------------------------------------------------------------------  ----
	| FormatTag     |  2 Bytes  | 编码方式，一般为0x0001               |     |
	--------------------------------------------------------------------     |
	| Channels      |  2 Bytes  | 声道数目，1--单声道；2--双声道       |     |
	--------------------------------------------------------------------     |
	| SamplesPerSec |  4 Bytes  | 采样频率                             |     |
	--------------------------------------------------------------------     |
	| AvgBytesPerSec|  4 Bytes  | 每秒所需字节数                       |     |===> WAVE_FORMAT
	--------------------------------------------------------------------     |
	| BlockAlign    |  2 Bytes  | 数据块对齐单位(每个采样需要的字节数) |     |
	--------------------------------------------------------------------     |
	| BitsPerSample |  2 Bytes  | 每个采样需要的bit数                  |     |
	--------------------------------------------------------------------     |
	|     	bsp;    |  2 Bytes  | 附加信息（可选，通过Size来判断有无） |     |
	--------------------------------------------------------------------  ----
	*/
	/*
	Fact Chunk (可选)
	==================================
	|       |所占字节数|  具体内容   |
	==================================
	| ID    |  4 Bytes |   'fact'    |
	----------------------------------
	| Size  |  4 Bytes |   数值为4   |
	----------------------------------
	| data  |  4 Bytes |             |
	----------------------------------
	*/
	/*
	Data Chunk 8
	==================================
	|       |所占字节数|  具体内容   |
	==================================
	| ID    |  4 Bytes |   'data'    |
	----------------------------------
	| Size  |  4 Bytes |             |
	----------------------------------
	| data  |          |             |
	----------------------------------
	*/

	DWORD dwFileLength = 12 + 26 + 8 + m_dwDataLength; //WAVE文件长度,不包括Fact Chunk 
	DWORD dwSize = dwFileLength - 8; //size是整个wav文件大小减去ID和Size所占用的字节数，即FileLen - 8 = Size。
	m_wavFile.SeekToBegin();
	m_wavFile.Write("RIFF", 4);
	m_wavFile.Write(&dwSize, 4);
	m_wavFile.Write("WAVE", 4);
	m_wavFile.Write("fmt ", 4);//注意这里的空格
	int formatSize = sizeof(waveform);
	m_wavFile.Write(&formatSize, 4);
	m_wavFile.Write(&waveform.wFormatTag, 2);
	m_wavFile.Write(&waveform.nChannels, 2);
	m_wavFile.Write(&waveform.nSamplesPerSec, 4);
	m_wavFile.Write(&waveform.nAvgBytesPerSec, 4);
	m_wavFile.Write(&waveform.nBlockAlign, 2);
	m_wavFile.Write(&waveform.wBitsPerSample, 2);
	m_wavFile.Write(&waveform.cbSize, 2);
	m_wavFile.Write("data", 4);
	m_wavFile.Write(&m_dwDataLength, 4);

	//在文件末尾追加新的音频数据
	m_wavFile.SeekToEnd();
	m_wavFile.Write(pWaveHdr->lpData, pWaveHdr->dwBytesRecorded);





	SetEvent(m_hEvtOnWrite);

	waveInAddBuffer (m_hWaveIn, pWaveHdr, sizeof (WAVEHDR)) ;
	

}