MFC音视频播放器-支持电子放大等功能
前言
本播放器在VS2019下开发，使用ffmpeg+D3D实现视频播放渲染功能。同时本播放器支持录像功能、截图功能、音视频播放功能、码流信息显示、电子放大功能等。D3D的渲染同时支持surface和texture两种方式，电子放大功能是在D3D Texture方式下进行实现。以下为该功能的一些核心代码，具体可以通过本文末的链接进行工程源码下载。
一、播放器电子放大功能操作
步骤一：播放RTSP 视频流后，点击开启电子放大功能按钮，如下图：
步骤二：点击按钮后，视频上会出现电子放大的变倍信息，本功能支持鼠标滚轮进行图形放大与缩小，也支持鼠标拖动视频进行显示，如下图：
步骤三：鼠标滚轮操作电子放大的放大缩小功能，如下图：
步骤四：按住鼠标左键后，可以拖动视频进行显示，如下图：
步骤五：点击关闭电子放大按钮后，恢复正常显示：
二、电子放大相关源码
CVideoPlayer鼠标事件：
void CVideoPlayer::OnLButtonDown(UINT nFlags, CPoint point)
{
myprint("OnLButtonDown");
SetFocus();
if (m_bDigitalZoom) // Digital Zoom
{
m_D3DRender.SetStartPt(point);
m_bLBtnDown = true;
}
CStatic::OnLButtonDown(nFlags, point);
}
void CVideoPlayer::OnLButtonUp(UINT nFlags, CPoint point)
{
m_bLBtnDown = false;
ReleaseCapture();
}
BOOL CVideoPlayer::OnMouseWheel(UINT nFlags, short zDelta, CPoint pt)
{
myprint("OnMouseWheel");
CRect rcClient;
GetClientRect(&rcClient);
CPoint ptTemp = pt;
::ScreenToClient(m_hWnd, &ptTemp);
if (!PtInRect(&rcClient, ptTemp))
return FALSE;
m_ptWheel = pt;
::ScreenToClient(m_hWnd, &m_ptWheel);
if (m_bDigitalZoom)
{
zDelta /= WHEEL_DELTA;
myprint("OnMouseWheel zDelta:%d", zDelta);
if (zDelta > 0)
{
for (short i = 0; i < zDelta; i++)
m_D3DRender.ZoomOut();
}
else
{
for (short i = 0; i > zDelta; i--)
m_D3DRender.ZoomIn();
}
return TRUE;
}
return FALSE;
}
void CVideoPlayer::OnMouseMove(UINT nFlags, CPoint point)
{
if (m_bPlaying == false)
return;
SetFocus();
if (m_bLBtnDown && m_bDigitalZoom)
{
CRect rc;
GetClientRect(&rc);
m_D3DRender.MoveToPtStart(point, rc);
}
CStatic::OnMouseMove(nFlags, point);
}
CD3DRender处理：
//zoom
void CD3DRender::ZoomIn()
{
m_Radius += m_RadiusFirst / DEFAULT_ZOOM_TIMES;
myprint("ZoomIn m_RadiusFirst:%lf m_Radius:%lf\n", m_RadiusFirst, m_Radius);
if (m_Radius >= DEFAULT_ZOOM_TIMES)
{
m_Radius = DEFAULT_ZOOM_TIMES;
}
D3DXVECTOR3 position(-x_curCam, y_curCam, sinf(m_Angle) * m_Radius);
D3DXVECTOR3 target(-x_curCam, y_curCam, 0.0f);
D3DXVECTOR3 up(0.0f, 1.0f, 0.0f);
D3DXMATRIX V;
D3DXMatrixLookAtLH(&V, &position, &target, &up);
m_pDirect3DDevice->SetTransform(D3DTS_VIEW, &V);
}
void CD3DRender::ZoomOut()
{
m_Radius -= m_RadiusFirst / DEFAULT_ZOOM_TIMES;
myprint("ZoomOut m_RadiusFirst:%lf m_Radius:%lf\n", m_RadiusFirst, m_Radius);
if (m_Radius <= 1.1f)
{
m_Radius = 1.1f;
}
D3DXVECTOR3 position(-x_curCam, y_curCam, sinf(m_Angle) * m_Radius);
D3DXVECTOR3 target(-x_curCam, y_curCam, 0.0f);
D3DXVECTOR3 up(0.0f, 1.0f, 0.0f);
D3DXMATRIX V;
D3DXMatrixLookAtLH(&V, &position, &target, &up);
m_pDirect3DDevice->SetTransform(D3DTS_VIEW, &V);
}
void CD3DRender::ResetZoom()
{
x_Cam = x_curCam = 0;
y_Cam = y_curCam = 0;
m_Radius = m_RadiusFirst;
m_Angle = m_AngleFirst;
D3DXVECTOR3 position(cosf(m_Angle) * m_Radius, 0.0f, sinf(m_Angle) * m_Radius);
D3DXVECTOR3 target(0.0f, 0.0f, 0.0f);
D3DXVECTOR3 up(0.0f, 1.0f, 0.0f);
D3DXMATRIX V;
D3DXMatrixLookAtLH(&V, &position, &target, &up);
m_pDirect3DDevice->SetTransform(D3DTS_VIEW, &V);
}
HRESULT CD3DRender::AppendZoomTextInfo(TCHAR* sText, CRect rcText)
{
my_mutex_lock(m_pDrawMutex);
memset(&m_DigZoomInfo, 0, sizeof(StreamInfo_t));
_sntprintf_s(m_DigZoomInfo.sText, sizeof(m_DigZoomInfo.sText), sizeof(m_DigZoomInfo.sText) - 1, "%s", sText);
m_DigZoomInfo.rcText.top = rcText.top;
m_DigZoomInfo.rcText.left = rcText.left;
m_DigZoomInfo.rcText.right = rcText.right;
m_DigZoomInfo.rcText.bottom = rcText.bottom;
my_mutex_unlock(m_pDrawMutex);
return 0;
}
HRESULT CD3DRender::ClearZoomTextInfo()
{
my_mutex_lock(m_pDrawMutex);
memset(&m_DigZoomInfo, 0, sizeof(StreamInfo_t));
my_mutex_unlock(m_pDrawMutex);
return 0;
}
void CD3DRender::D3DDrawZoomText()
{
my_mutex_lock(m_pDrawMutex);
m_pD3DFont->DrawText(NULL, m_DigZoomInfo.sText, -1, &m_DigZoomInfo.rcText, DT_LEFT/*DT_CENTER | DT_VCENTER*/, D3DCOLOR_XRGB(220, 20, 60));
my_mutex_unlock(m_pDrawMutex);
}
void CD3DRender::SetStartPt(::CPoint pt)
{
pt_start = pt;
x_Cam = x_curCam;
y_Cam = y_curCam;
}
void CD3DRender::MoveToPtStart(::CPoint pt, CRect rc)
{
float x = x_Cam + 40.0f * ((float)m_Radius / 20.0f) * (float)(pt.x - pt_start.x) / (float)(rc.right - rc.left);
float y = y_Cam + 40.0f * ((float)m_Radius / 20.0f) * (float)(pt.y - pt_start.y) / (float)(rc.bottom - rc.top);
x_curCam = x;
y_curCam = y;
myprint("position( %f, %f, %f) x_Cam = %f, y_Cam = %f\n", x, y, sinf(m_Angle) * m_Radius, x_Cam, y_Cam);
myprint("rc(%d, %d, %d, %d)", rc.left, rc.top, rc.right, rc.bottom);
D3DXVECTOR3 position(-x, y, sinf(m_Angle) * m_Radius);
D3DXVECTOR3 target(-x, y, 0.0f);
D3DXVECTOR3 up(0.0f, 1.0f, 0.0f);
D3DXMATRIX V;
D3DXMatrixLookAtLH(&V, &position, &target, &up);
m_pDirect3DDevice->SetTransform(D3DTS_VIEW, &V);
}
三、相关下载
原文地址：https://blog.csdn.net/linyibin_123/article/details/144151813
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