【转】C# 视频监控系列（13）：H264播放器——控制播放和截图
本文原文地址：http://www.cnblogs.com/over140/archive/2009/03/30/1421531.html
阿里云栖社区也有相关的视频开发案例：https://yq.aliyun.com/articles/51182
注意
本系列文章限于学习交流，注重过程，由于涉及公司，所以不提供源代码下载，非常抱歉！！但是请大家放心，核心、实现以及其他能够贴出来的代码我都会贴出来，并且争取尽所能的回答留言里的每一个问题，感谢大家关注，欢迎交流 :)
系列
5. C# 视频监控系列(5)：客户端——给服务器端发送字符串和录像(数据捕获)
6. C# 视频监控系列(6)：服务器端——封装API(上) [HikServer.dll]
7. C# 视频监控系列(7)：服务器端——封装API(下) [DS40xxSDK.dll]
8. C# 视频监控系列(8)：服务器端——预览和可被客户端连接
9. C# 视频监控系列(9)：服务器端——数据捕获(抓图 + 录像)
10. C# 视频监控系列(10)：服务器端——验证、设置画面质量、字幕叠加、板卡序列号
11. C# 视频监控系列(11)：H264播放器——封装API[HikPlayM4.dll]
12. C# 视频监控系列(12)：H264播放器——播放录像文件
13. C# 视频监控系列(13)：H264播放器——控制播放和截图
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);
}
}
C# Code:
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:
/// <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。
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:
/// 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:
/// <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。
结束
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