cdaudio.cpp

Visual C++_ 600 编程学习捷径

// CDAudio.cpp: implementation of the CCDAudio class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "CDPlayer.h"
#include "CDAudio.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CCDAudio::CCDAudio()
{
	// 初始化成员变量
	m_bOpened=FALSE;
	m_bPaused=FALSE;
	m_bPlaying=FALSE;
	m_wDeviceID=0;
}

CCDAudio::~CCDAudio()
{
	Close ();
}

//////////////////////////////////////////////////////////////////////
// Member Functions
//////////////////////////////////////////////////////////////////////

BOOL CCDAudio::Open (void)
{
	if(!m_bOpened)
	{
		// 初始化成员变量
		m_bOpened = m_bPaused = m_bPlaying = FALSE;
		m_wDeviceID = 0;

		// 打开设备
		MCI_OPEN_PARMS OpenParms;
		OpenParms.lpstrDeviceType = (LPCSTR) MCI_DEVTYPE_CD_AUDIO;
		OpenParms.wDeviceID = 0;
		if (mciSendCommand (NULL, MCI_OPEN, MCI_WAIT | MCI_OPEN_TYPE | MCI_OPEN_TYPE_ID | MCI_OPEN_SHAREABLE, (DWORD)(LPVOID) &OpenParms))
			return FALSE;
		m_wDeviceID = OpenParms.wDeviceID;
		m_bOpened = TRUE;

		// 设置时间格式
		MCI_SET_PARMS SetParms;
		SetParms.dwTimeFormat = MCI_FORMAT_TMSF;
	
		if (mciSendCommand (m_wDeviceID, MCI_SET, MCI_WAIT | MCI_SET_TIME_FORMAT, (DWORD)(LPVOID) &SetParms))
		{
			Close ();
			return FALSE;
		}
		//向MCI发送命令
		mciSendCommand (m_wDeviceID, MCI_SEEK, MCI_SEEK_TO_START, NULL);
	}

	return TRUE;
}

void CCDAudio::Close (void)
{
	if (m_bOpened){
		// 停止播放且关闭设备
		if (m_bPlaying || m_bPaused)
			mciSendCommand (m_wDeviceID, MCI_STOP, NULL, NULL);
		mciSendCommand (m_wDeviceID, MCI_CLOSE, MCI_WAIT, NULL);

		// 清空成员变量
		m_bOpened=FALSE;
		m_bPaused=FALSE;
		m_bPlaying=FALSE;
		m_wDeviceID = 0;
		}
}

BOOL CCDAudio::Play (void)
{
	if (!m_bOpened)
		Open ();

	if (m_bOpened)//播放
	{
		if (!IsAudioTrack (GetTrack ()))
			return FALSE;
		MCI_PLAY_PARMS PlayParms;
		PlayParms.dwCallback = NULL;
		PlayParms.dwFrom = MCI_MAKE_TMSF (GetTrack (), GetMinutes (), GetSeconds (), GetFrames ());
		if (mciSendCommand (m_wDeviceID, MCI_PLAY, MCI_FROM, (DWORD)(LPVOID) &PlayParms))
			return FALSE;
		m_bPaused = FALSE;
		m_bPlaying = TRUE;
		return TRUE;
	}

	return FALSE;
}

//停止播放
void CCDAudio::Stop (void)
{
	if (m_bOpened && m_bPlaying){
		mciSendCommand (m_wDeviceID, MCI_STOP, MCI_WAIT, NULL);
		mciSendCommand (m_wDeviceID, MCI_SEEK, MCI_SEEK_TO_START, NULL);
		m_bPlaying = FALSE;
		m_bPaused = FALSE;
		}
}

void CCDAudio::Pause( void )
{
	if (m_bOpened && m_bPlaying)
	{
		// 暂停CD
		MCI_PLAY_PARMS PlayParms;
		if (mciSendCommand (m_wDeviceID, MCI_PAUSE, 0, (DWORD)(LPVOID) &PlayParms))
			return;
		m_bPaused = TRUE;
	}
}

//得到CD上的总音轨数
int CCDAudio::GetTracks (void)
{
	if (m_bOpened){
		MCI_STATUS_PARMS StatusParms;
		StatusParms.dwItem = MCI_STATUS_NUMBER_OF_TRACKS;
		if (mciSendCommand (m_wDeviceID, MCI_STATUS, MCI_STATUS_ITEM, (DWORD)(LPVOID) &StatusParms))
			return -1;
		return (int) StatusParms.dwReturn;
		}

	return -1;
}

//得到CD总时间
void CCDAudio::GetAudioLength (int *pnMinutes, int *pnSeconds)
{
	if (m_bOpened)
	{
		MCI_STATUS_PARMS StatusParms;
		StatusParms.dwItem = MCI_STATUS_LENGTH;
		if (mciSendCommand (m_wDeviceID, MCI_STATUS, MCI_WAIT | MCI_STATUS_ITEM, (DWORD)(LPVOID) &StatusParms))
		{
			*pnMinutes = -1;
			*pnSeconds = -1;
			return;
		}
		*pnMinutes = MCI_MSF_MINUTE (StatusParms.dwReturn);
		*pnSeconds = MCI_MSF_SECOND (StatusParms.dwReturn);
		return;
	}

	*pnMinutes = -1;
	*pnSeconds = -1;
}

//得到音轨长度
void CCDAudio::GetTrackLength (int nTrack, int *pnMinutes, int *pnSeconds)
{
	if (m_bOpened){
		MCI_STATUS_PARMS StatusParms;
		StatusParms.dwItem = MCI_STATUS_LENGTH;
		StatusParms.dwTrack = (DWORD) nTrack;
		if (mciSendCommand (m_wDeviceID, MCI_STATUS, MCI_WAIT | MCI_STATUS_ITEM | MCI_TRACK, (DWORD)(LPVOID) &StatusParms)){
			*pnMinutes = -1;
			*pnSeconds = -1;
			return;
			}
		*pnMinutes = MCI_MSF_MINUTE (StatusParms.dwReturn);
		*pnSeconds = MCI_MSF_SECOND (StatusParms.dwReturn);
		return;
		}

	*pnMinutes = -1;
	*pnSeconds = -1;
}

//得到当前音轨
int CCDAudio::GetTrack (void)
{
	if (m_bOpened)
	{
		// 保存当前位置
		MCI_STATUS_PARMS StatusParms;
		StatusParms.dwItem = MCI_STATUS_POSITION;
		if (mciSendCommand (m_wDeviceID, MCI_STATUS, MCI_WAIT | MCI_STATUS_ITEM, (DWORD)(LPVOID) &StatusParms))
			return -1;
		return MCI_TMSF_TRACK (StatusParms.dwReturn);
	}

	return -1;
}

int CCDAudio::GetMinutes (void)
{
	if (m_bOpened)
	{
		MCI_STATUS_PARMS StatusParms;
		StatusParms.dwItem = MCI_STATUS_POSITION;
		if (mciSendCommand (m_wDeviceID, MCI_STATUS, MCI_WAIT | MCI_STATUS_ITEM, (DWORD)(LPVOID) &StatusParms))
			return -1;
		return MCI_TMSF_MINUTE (StatusParms.dwReturn);
	}

	return -1;
}

int CCDAudio::GetSeconds (void)
{
	if (m_bOpened)
	{
		MCI_STATUS_PARMS StatusParms;
		StatusParms.dwItem = MCI_STATUS_POSITION;
		if (mciSendCommand (m_wDeviceID, MCI_STATUS, MCI_WAIT | MCI_STATUS_ITEM, (DWORD)(LPVOID) &StatusParms))
			return -1;
		return MCI_TMSF_SECOND (StatusParms.dwReturn);
	}

	return -1;
}

int CCDAudio::GetFrames (void)
{
	if (m_bOpened)
	{
		MCI_STATUS_PARMS StatusParms;
		StatusParms.dwItem = MCI_STATUS_POSITION;
		if (mciSendCommand (m_wDeviceID, MCI_STATUS, MCI_WAIT | MCI_STATUS_ITEM, (DWORD)(LPVOID) &StatusParms))
			return -1;
		return MCI_TMSF_FRAME (StatusParms.dwReturn);
	}

	return -1;
}

BOOL CCDAudio::IsDriveReady (void)
{
	if (m_bOpened)
	{
		// CD-ROM是否准备好了
		MCI_STATUS_PARMS StatusParms;
		StatusParms.dwItem = MCI_STATUS_MODE;
		if (mciSendCommand (m_wDeviceID, MCI_STATUS, MCI_STATUS_ITEM, (DWORD)(LPVOID) &StatusParms))
			return FALSE;
		if (StatusParms.dwReturn == MCI_MODE_NOT_READY || StatusParms.dwReturn == MCI_MODE_OPEN)
			return FALSE;
		// 是否是CD音轨
		StatusParms.dwItem = MCI_STATUS_MEDIA_PRESENT;
		if (mciSendCommand (m_wDeviceID, MCI_STATUS, MCI_STATUS_ITEM, (DWORD)(LPVOID) &StatusParms))
			return FALSE;
		return (BOOL) StatusParms.dwReturn;
	}

	return FALSE;
}

BOOL CCDAudio::IsAudioTrack (int nTrack)
{
	if (m_bOpened)
	{
		// 是否是CD音轨
		MCI_STATUS_PARMS StatusParms;
		StatusParms.dwItem = MCI_CDA_STATUS_TYPE_TRACK;
		StatusParms.dwTrack = nTrack;
		if (mciSendCommand (m_wDeviceID, MCI_STATUS, MCI_STATUS_ITEM | MCI_TRACK, (DWORD)(LPVOID) &StatusParms))
			return FALSE;
		if (StatusParms.dwReturn == MCI_CDA_TRACK_AUDIO)
			return TRUE;
	}

	return FALSE;
}

BOOL CCDAudio::IsPlaying (BOOL *pbPaused)
{
	*pbPaused = m_bPaused;

	return m_bPlaying;
}

BOOL CCDAudio::SeekTo (int nTrack, int nMinute, int nSecond, int nFrame)
{
	if (m_bOpened)
	{
		MCI_SEEK_PARMS SeekParms;
		SeekParms.dwTo = MCI_MAKE_TMSF (nTrack, nMinute, nSecond, nFrame);
		if (m_bPlaying && !m_bPaused)
			mciSendCommand (m_wDeviceID, MCI_PAUSE, 0, NULL);
		if (mciSendCommand (m_wDeviceID, MCI_SEEK, MCI_TO | MCI_WAIT, (DWORD)(LPVOID) &SeekParms))
			return FALSE;
		if (m_bPlaying && !m_bPaused)
			Play ();
		return TRUE;
		}

	return FALSE;
}

void CCDAudio::Forward (int nSeconds)
{
	if (m_bOpened)
	{
		// 将格式变为毫秒
		MCI_SET_PARMS SetParms;
		SetParms.dwTimeFormat = MCI_FORMAT_MILLISECONDS;
		mciSendCommand (m_wDeviceID, MCI_SET, MCI_WAIT | MCI_SET_TIME_FORMAT, (DWORD)(LPVOID) &SetParms);
		// 得到当前位置
		MCI_STATUS_PARMS StatusParms;
		DWORD dwPos;
		StatusParms.dwItem = MCI_STATUS_POSITION;
		mciSendCommand (m_wDeviceID, MCI_STATUS, MCI_WAIT | MCI_STATUS_ITEM, (DWORD)(LPVOID) &StatusParms);
		dwPos = StatusParms.dwReturn;
		// 将位置增加
		dwPos += (DWORD) nSeconds * 1000;
		// 暂停并寻找位置
		MCI_SEEK_PARMS SeekParms;
		SeekParms.dwTo = dwPos;
		if (m_bPlaying && !m_bPaused)
			mciSendCommand (m_wDeviceID, MCI_PAUSE, 0, NULL);
		mciSendCommand (m_wDeviceID, MCI_SEEK, MCI_TO | MCI_WAIT, (DWORD)(LPVOID) &SeekParms);
		// 将时间格式变为分秒
		SetParms.dwTimeFormat = MCI_FORMAT_TMSF;
		mciSendCommand (m_wDeviceID, MCI_SET, MCI_WAIT | MCI_SET_TIME_FORMAT, (DWORD)(LPVOID) &SetParms);
		// 播放CD
		if (m_bPlaying && !m_bPaused)
			Play ();
		}
}

void CCDAudio::Backward (int nSeconds)
{
	if (m_bOpened)
	{
		// 改变时间格式为毫秒
		MCI_SET_PARMS SetParms;
		SetParms.dwTimeFormat = MCI_FORMAT_MILLISECONDS;
		mciSendCommand (m_wDeviceID, MCI_SET, MCI_WAIT | MCI_SET_TIME_FORMAT, (DWORD)(LPVOID) &SetParms);
		// 得到当前位置
		MCI_STATUS_PARMS StatusParms;
		DWORD dwPos;
		StatusParms.dwItem = MCI_STATUS_POSITION;
		mciSendCommand (m_wDeviceID, MCI_STATUS, MCI_WAIT | MCI_STATUS_ITEM, (DWORD)(LPVOID) &StatusParms);
		dwPos = StatusParms.dwReturn;
		// 将当前位置减少
		dwPos -= (DWORD) nSeconds * 1000;
		// 暂停并寻找位置
		MCI_SEEK_PARMS SeekParms;
		SeekParms.dwTo = dwPos;
		if (m_bPlaying && !m_bPaused)
			mciSendCommand (m_wDeviceID, MCI_PAUSE, 0, NULL);
		mciSendCommand (m_wDeviceID, MCI_SEEK, MCI_TO | MCI_WAIT, (DWORD)(LPVOID) &SeekParms);
		// 改变时间格式为分秒
		SetParms.dwTimeFormat = MCI_FORMAT_TMSF;
		mciSendCommand (m_wDeviceID, MCI_SET, MCI_WAIT | MCI_SET_TIME_FORMAT, (DWORD)(LPVOID) &SetParms);
		// 恢复播放
		if (m_bPlaying && !m_bPaused)
			Play ();
		}
}

void CCDAudio::OpenCD_Rom(void)
{
	if (m_bOpened)
	{
		Stop ();
		mciSendCommand (m_wDeviceID, MCI_SET, MCI_SET_DOOR_OPEN, NULL);
	}
}

void CCDAudio::CloseCD_Rom (void)
{
	if (m_bOpened)
	{
		mciSendCommand (m_wDeviceID, MCI_SET, MCI_SET_DOOR_CLOSED, NULL);
		Stop ();
	}	
}