C# 视频监控系列（13）：H264播放器——控制播放和截图
本文共 7485 字，大约阅读时间需要 24 分钟。
正文
一、控制播放
1.1 暂停/播放/停止
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 %d\n " ,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); } }
} } 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
现在在做语音部分，受阻中...
Hik_PlayM4_Play(),从当前位置开始正常播放。
Hik_PlayM4_Slow：慢速播放，每次调用将使当前播放速度慢一倍；最多调用4次；要恢复正常播放调用Hik_PlayM4_Play。
1.3 开始/末尾
VC++ Code:
// / // Funtion:Locate to the file head. // void CPlayerDlg::OnGotoStart() { // TODO: Add your control notification handler code here if (m_bFileRefCreated) Hik_PlayM4_SetCurrentFrameNum(PORT, 0 ); else Hik_PlayM4_SetPlayPos(PORT, 0 ); } // / // Funtion:Locate to the end. // void CPlayerDlg::OnGotoEnd() { // TODO: Add your control notification handler code here if (m_bFileRefCreated) { // Note: May create many WM_FILE_END message. The best way is to synchronize the option; int nEndFrame = m_nTotalFrames; while ( ! Hik_PlayM4_SetCurrentFrameNum(PORT,nEndFrame -- )) { // TRACE("FrameNum is :%d\n",nEndFrame); if (nEndFrame == 0 ) break ; } } else Hik_PlayM4_SetPlayPos(PORT, 1 ); }
C# Code:
/// <summary> /// 开始位置 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnGotoStart_Click( object sender, EventArgs e) { HikPlayer.Hik_PlayM4_SetPlayPos(PORT, 0 ); } /// <summary> /// 末尾位置 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnGotoEnd_Click( object sender, EventArgs e) { HikPlayer.Hik_PlayM4_SetPlayPos(PORT, 1 ); }
代码说明：
1. 注意Hik_PlayM4_SetPlayPos的第二个参数取值范围是0-1之间，即可以理解0是开始位置，1是结束位置；但是有一点比较奇怪，每次都会延迟3秒，即到末尾后还播放3秒钟！
二、截图
VC++ Code:
// // Function:The call back funtion for capture image! /// // void CALLBACK DisplayCBFun( long nPort,\ char * pBuf, long nSize,\ long nWidth, long nHeight,\ long nStamp, long nType, long nReceaved) { if ( ! g_bCapPic) return ; CString csFile; csFile.Format( " capture%02d.bmp " ,pic); /* switch(nType) { case T_UYVY: csFile="uyvy.bmp"; break; case T_YV12: csFile="yv12.bmp"; break; case T_RGB32: csFile="rgb.bmp"; break; default: return ; } */ // Note:this funtion is slow,so if you want to save as a .bmp file,don't call! if ( ! Hik_PLayM4_ConvertToBmpFile(pBuf,nSize,nWidth,nHeight,nType,csFile.GetBuffer(csFile.GetLength()))) { CString csErr; csErr.Format( " Convert to bmp faild(%d). " ,Hik_PlayM4_GetLastError(nPort)); AfxMessageBox(csErr); } pic ++ ; g_bCapPic = FALSE; }
C# Code:
DisplayCBFun DisCB; /// <summary> /// 截图 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnCapImage_Click( object sender, EventArgs e) { DisCB = new DisplayCBFun(DisplayCBFun); HikPlayer.Hik_PlayM4_SetDisplayCallBack(PORT, DisCB); } /// <summary> /// 截图回调函数 /// </summary> /// <param name="nPort"></param> /// <param name="pBuf"></param> /// <param name="nSize"></param> /// <param name="nWidth"></param> /// <param name="nHeight"></param> /// <param name="nStamp"></param> /// <param name="nType"></param> /// <param name="nReceaved"></param> public void DisplayCBFun( int nPort, IntPtr pBuf, int nSize, int nWidth, int nHeight, int nStamp, int nType, int nReceaved) { if (HikPlayer.Hik_PLayM4_ConvertToBmpFile(pBuf, nSize, nWidth, nHeight, nType, string .Format( " C:\\capture{0}.bmp " , nPort))) { MessageBox.Show( " 转换bmp失败！ " ); } // 停止回调 HikPlayer.Hik_PlayM4_SetDisplayCallBack(PORT, null ); }
代码说明：
1. 这里和源代码有点出入，他用的是g_bCapPic变量来控制是否捕获图片，我用的是设置委托实例和null来达到。API说明：设置抓图回调函数；注意要尽快返回，如果要停止回调，可以把回调函数指针DisplayCBFun设为NULL。
本文转自over140 51CTO博客，原文链接：http://blog.51cto.com/over140/586632，如需转载请自行联系原作者
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