C# 视频监控系列(13):H264播放器——控制播放和截图。
一、控制播放
VC++ Code:
////////////////////////////////////////////////////////////////////////////////
//Funtion:Play or change the play speed to normal;
///////////////////////////////////////////////////////////////////////////////
void CPlayerDlg::OnPlay()
{
// TODO: Add your control notification handler code here
Play();
}
void CPlayerDlg::Play()
{
m_nSpeed=0;
OnThrow0();
//#ifdef _TEST_CALLBACK
if(m_bConvert)
Hik_PlayM4_SetDecCallBack(PORT,DecCBFun);
else
m_pMainMenu->EnableMenuItem(ID_FILE_CLOSE, FALSE);
//#endif
if(m_bPlaying)
{
Hik_PlayM4_Play(PORT,GetDlgItem(IDC_SHOW)->m_hWnd);
}
else
{
if(m_bStreamType)
{
::SetFilePointer(m_hStreamFile,m_nHeadSize,0,FILE_BEGIN);
Hik_PlayM4_ResetSourceBuffer(PORT);
SetEvent(m_hEventInput);
}
m_bPlaying = Hik_PlayM4_Play(PORT,GetDlgItem(IDC_SHOW)->m_hWnd);
m_bSound=Hik_PlayM4_PlaySound(PORT);
if(m_bPlaying)
SetTimer(PLAY_TIMER,500,NULL);
}
if(m_bPlaying)
SetPlayState();
else
{
CString csError;
csError.Format("Play the file faild.(%d)",Hik_PlayM4_GetLastError(PORT));
AfxMessageBox(csError);
}
}
//////////////////////////////////////////////////////////////////////////////
//Funtion:pause.
//////////////////////////////////////////////////////////////////////////////
void CPlayerDlg::OnPause()
{
// TODO: Add your control notification handler code here
if(m_bPlaying)
{
m_bPause=!m_bPause;
Pause(m_bPause);
}
}
void CPlayerDlg::Pause(BOOL bPause)
{
if(m_bPaused == bPause)
return;
m_bPaused=bPause;
Hik_PlayM4_Pause(PORT,bPause);
TRACE("PAUSE %dn",m_bPaused);
}
/////////////////////////////////////////////////////////////////////////////
//Function: Stop
/////////////////////////////////////////////////////////////////////////////
void CPlayerDlg::OnStop()
{
// TODO: Add your control notification handler code here
if(m_bPlaying)
{
Stop();
}
if(m_bConvert)
{
if(outFile!=NULL)
closeWriffFiles();
if(yuvBuf!=NULL)
{
free(yuvBuf);
yuvBuf=NULL;
}
m_bConvert=0;
//
}
}
void CPlayerDlg::Stop()
{
CButton *pButton;
if(!m_bPlaying)
return;
KillTimer(PLAY_TIMER);
if(Hik_PlayM4_StopSound())
{
m_bSound=FALSE;
pButton = (CButton *)GetDlgItem(IDC_SOUND);
pButton->SetIcon(m_hSoundStopIcon);
}
//continue before stop.Add by lgl at 9-19;
m_bPause=FALSE;
//stop
m_bPlaying = !Hik_PlayM4_Stop(PORT);
if(!m_bPlaying)
{
SetStopState();
if(m_bStreamType)
ResetEvent(m_hEventInput);
}
}
C# Code:
//是否暂停
private bool isPause;
/// <summary>
/// 播放
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnPlay_Click(object sender, EventArgs e)
{
if (!string.IsNullOrEmpty(m_strPlayFileName))
{
//是否暂停->播放
if (isPause)
{
HikPlayer.Hik_PlayM4_Pause(PORT, false);
isPause = false;
}
else
OpenFile();
}
}
/// <summary>
/// 暂停
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnPause_Click(object sender, EventArgs e)
{
HikPlayer.Hik_PlayM4_Pause(PORT, true);
isPause = true;
}
/// <summary>
/// 停止
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnStop_Click(object sender, EventArgs e)
{
HikPlayer.Hik_PlayM4_Stop(PORT);
HikPlayer.Hik_PlayM4_CloseFile(PORT);
HikPlayer.Hik_PlayM4_RealeseDDraw();
pVideo.Invalidate(true);
}
代码说明:
1. 关于变量PORT、m_strPlayFileName和方法OpenFile可以看上篇文章的代码。
2. 注意Hik_PlayM4_Pause的第二个参数用法。
1.2 快进/慢进
VC++ Code:
//////////////////////////////////////////////////////////////////////////////
//Funtion: Fast
//////////////////////////////////////////////////////////////////////////////
void CPlayerDlg::OnFastForward()
{
// TODO: Add your control notification handler code here
//Throw B-Frame ,improve the performance;
if(Hik_PlayM4_Fast(PORT))
{
m_nSpeed++;
if(m_nSpeed>0)
OnThrow2();
SetFastForwardState();
}
}
//////////////////////////////////////////////////////////////////////////////
//Funtion: Slow;
//////////////////////////////////////////////////////////////////////////////
void CPlayerDlg::OnFastBackward()
{
// TODO: Add your control notification handler code here
if(Hik_PlayM4_Slow(PORT))
{
m_nSpeed--;
if(m_nSpeed<=0)
OnThrow0();
SetFastBackWardState();
}
}
C# Code:
int m_nSpeed;
/// <summary>
/// 快进
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnFastForward_Click(object sender, EventArgs e)
{
if (HikPlayer.Hik_PlayM4_Fast(PORT))
{
m_nSpeed++;
if (m_nSpeed > 0)
OnThrow2();
}
}
/// <summary>
/// 慢放
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnFastBackward_Click(object sender, EventArgs e)
{
//慢速播放
if (HikPlayer.Hik_PlayM4_Slow(PORT))
{
//timer1.Interval
m_nSpeed--;
if (m_nSpeed <= 0)
OnThrow0();
}
}
public void OnThrow0()
{
HikPlayer.Hik_PlayM4_ThrowBFrameNum(PORT, 0);
}
public void OnThrow2()
{
HikPlayer.Hik_PlayM4_ThrowBFrameNum(PORT, 2);
}
代码说明:
1. 注意关于这两个函数API的说明:
Hik_PlayM4_Fast:快速播放,每次调用将使当前播放速度加快一倍,最多调用4次;要恢复正常播放调用Hik_PlayM4_Play(),从当前位置开始正常播放。