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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

链接1: 可执行exe下载
链接2: 播放器工程源码下载