控制台编程

开发平台：
C/C++

LargeFileWaveOut.cpp：源码内容
							#include "StdAfx.h"
#include ".largefilewaveout.h"
CLargeFileWaveOut::CLargeFileWaveOut(void)
{
	// 设置默认属性
	this->m_nBufferNums = LARGEWAVEOUT_BUFFER_NUMS;
	this->m_pNextBuffer = NULL;
	this->m_pAllocBuffer = NULL;
	this->m_nBufferNums = 0;
	this->m_nSamplesPerBlock = LARGEWAVEOUT_SAMPLES_PER_BLOCK;
	this->m_dwBufferSize = 0;
}
CLargeFileWaveOut::~CLargeFileWaveOut(void)
{
	this->Stop();
}
//////////////////////////////////////////////////////////////////////////
// 打开输出设备，设置回调方式，并分配播放缓冲和读入部分数据
BOOL CLargeFileWaveOut::Init(WAVEFORMATEX fmt, DWORD hWnd)
{
	// 打开输出设备，设置回调方式
	BOOL bRet = CFileWaveOut::Init(fmt, hWnd);
	// 读取字节数
	UINT nRead = 0;
	// 分配缓存区结构
	if (bRet)
	{
		this->m_pAllocBuffer = new WAVEHDR[this->m_nBufferNums];
		this->m_pNextBuffer = this->m_pAllocBuffer;
		// 分配缓冲块
		if (this->m_pAllocBuffer != NULL)
		{
			for (unsigned int i = 0; i < this->m_nBufferNums; i++)
			{
				this->m_pAllocBuffer[i].lpData = new char[this->m_dwBufferSize];
				this->m_pAllocBuffer[i].lpNext = NULL;
				this->m_pAllocBuffer[i].dwBufferLength = 0;
				if (this->m_pAllocBuffer[i].lpData != NULL && 
					! this->m_wavFile.IsEOF())
				{
					// 获取实际读取得byte数
					nRead = this->m_wavFile.ReadBytes(
						this->m_pAllocBuffer[i].lpData, this->m_dwBufferSize);
					// 填写缓冲块格式信息
					this->m_pAllocBuffer[i].dwBufferLength = nRead;
					this->m_pAllocBuffer[i].dwBytesRecorded = 0;
					this->m_pAllocBuffer[i].dwFlags = 0;
					this->m_pAllocBuffer[i].dwLoops = 0;
					this->m_pAllocBuffer[i].dwUser = 0;
					// 预制缓冲块
					waveOutPrepareHeader(this->m_hWaveOut, 
						&this->m_pAllocBuffer[i], sizeof(WAVEHDR));
				}
			}
		}
	}
	return bRet;
}
//////////////////////////////////////////////////////////////////////////
// 设置缓冲块数量
void CLargeFileWaveOut::SetBufferNums(UINT nCount)
{
	this->m_nBufferNums = nCount;
}
//////////////////////////////////////////////////////////////////////////
// 处理WOM_DONE消息，继续播放下一个缓冲块
LRESULT CLargeFileWaveOut::OnDone(DWORD dwParam)
{
	WAVEHDR* pTempHdr = (WAVEHDR*) dwParam;		// 播放完的缓冲块
	UINT nRead = 0;
	// 已播放的缓冲块标记长度为0，用于标记已经播放
	pTempHdr->dwBufferLength = 0;
	// 确定待播放的缓冲块，类似使用循环队列
	if (this->m_pNextBuffer - this->m_pAllocBuffer >= this->m_nBufferNums)
	{
		this->m_pNextBuffer = this->m_pAllocBuffer;
	}
	// 若要播放的缓冲块未播放过，则播放此缓冲块
	if (this->m_pNextBuffer->dwBufferLength > 0)
	{
		waveOutWrite(this->m_hWaveOut, this->m_pNextBuffer, sizeof(WAVEHDR));
		this->m_pNextBuffer ++;
		// 若文件未读取完毕，从文件载入下一个缓冲块，装入已播放缓冲块中
		if (! this->m_wavFile.IsEOF())
		{
			nRead = this->m_wavFile.ReadBytes(pTempHdr->lpData, this->m_dwBufferSize);
			// 填写缓冲块信息
			pTempHdr->dwBufferLength = nRead;
			pTempHdr->dwBytesRecorded = 0;
			pTempHdr->dwFlags = 0;
			pTempHdr->dwLoops = 0;
			pTempHdr->dwUser = 0;
		}
	}
	// 所有缓冲块都已经播放完毕，停止播放
	else
	{
		this->Stop();
	}
	return 0;
}
//////////////////////////////////////////////////////////////////////////
// 设定缓冲块大小
void CLargeFileWaveOut::SetSamplesPerBlock(UINT nSamplesCount)
{
	this->m_nSamplesPerBlock = nSamplesCount;
}
//////////////////////////////////////////////////////////////////////////
// 清除缓冲区，初始化数据
void CLargeFileWaveOut::Dispose()
{
	// 释放播放文件分配的缓存
	if (this->m_pAllocBuffer != NULL)
	{
		// 释放所有缓冲块
		for (unsigned int i = 0; i < this->m_nBufferNums; i++)
		{
			this->m_pNextBuffer = &this->m_pAllocBuffer[i];
			if (this->m_pNextBuffer->lpData != NULL)
			{
				delete[] this->m_pNextBuffer->lpData;
			}
		}
		// 删除缓冲结构
		delete[] this->m_pAllocBuffer;
	}
	this->m_pAllocBuffer = NULL;
	this->m_pNextBuffer = NULL;
	// 重置CWaveOut数据
	CWaveOut::Dispose();
}
//////////////////////////////////////////////////////////////////////////
// 开始播放音频逻数据，发送第一个缓冲块
void CLargeFileWaveOut::Start()
{
	if (this->m_pAllocBuffer != NULL)
	{
		CWaveOut::Start();
		// 发送第一个缓冲块
		this->m_pNextBuffer = this->m_pAllocBuffer + 1;
		waveOutWrite(this->m_hWaveOut, this->m_pAllocBuffer, sizeof(WAVEHDR));
	}
}
//////////////////////////////////////////////////////////////////////////
// 停止播放，关闭输出设备, UnPrepare所用到的缓冲块
void CLargeFileWaveOut::Stop()
{
	// 停止播放
	CWaveOut::Stop();
	// UnPrepare所有缓冲块
	for (unsigned int i = 0; i < this->m_nBufferNums; i++)
	{
		this->m_pNextBuffer = &this->m_pAllocBuffer[i];
		waveOutUnprepareHeader(
			this->m_hWaveOut, this->m_pNextBuffer, sizeof(WAVEHDR));
	}
	// 关闭输出设备
	CWaveOut::CloseDev();
	// 清除缓冲区，初始化数据
	this->Dispose();
}

						