SDI Technologies iH30 Especificações descarregar pdf (Página 48)

Video Compositing

Quadro SDI Output PG-03776-001_v06 | 43

In configuration of the SDI device, alpha compositing is enabled as follows:

l_vioConfig.fields = 0;

l_vioConfig.fields = NVVIOCONFIG_COMPOSITE;

l_vioConfig.vioConfig.outConfig.enableComposite = TRUE;

l_vioConfig.fields = NVVIOCONFIG_ALPHAKEYCOMPOSITE;

l_vioConfig.vioConfig.outConfig.enableAlphaKeyComposite |= TRUE;

if (NvAPI_VIO_SetConfig(m_vioHandle, &l_vioConfig)!= NVAPI_OK) {

return E_FAIL;

}

OpenGL must be configured to provide an alpha channel to the SDI device. In the case

of sending pbuffer data with

WGL/GLX_send_video this is done by specifying

VIDEO_OUT_COLOR_AND_ALPHA to the bind command as follows:

// Bind pbuffer to video device.

if (!wglBindVideoImageNV(ghpDevList[0], gPBuffer.getHandle(),

WGL_VIDEO_OUT_COLOR_AND_ALPHA_NV)) {

// Handle error.

}

In the case of the GL_present_video extension, the format of the buffer object or texture

must contain an alpha channel. Typical formats to create such a buffer object or texture

would be either

GL_RGBA8 or GL_RGBA16F_ARB.

7.2 CHROMA-KEYING

To perform chroma keying, the application can specify up to two (Cr,Cb) pairs that

represent the starting and ending chroma values for replacement within the video

stream. Chroma keying is enabled with the ranges specified using the control API as

follows.

// Cr composite ranges

l_vioConfig.fields = 0; // reset fields

l_vioConfig.fields = NVVIOCONFIG_COMPOSITE |

NVVIOCONFIG_COMPOSITE_CR;

l_vioConfig.vioConfig.outConfig.enableComposite = TRUE;

l_vioConfig.vioConfig.outConfig.compRange.uEnabled = TRUE;

l_vioConfig.vioConfig.outConfig.compRange.uRange = 0;

l_vioConfig.vioConfig.outConfig.compRange.uMin = crCompRange[0];

l_vioConfig.vioConfig.outConfig.compRange.uMax = crCompRange[1];

if (NvAPI_VIO_SetConfig(m_vioHandle, &l_vioConfig)!= NVAPI_OK) {

return E_FAIL;

}

l_vioConfig.vioConfig.outConfig.compRange.uRange = 1;

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SDI Technologies iH30 Especificações Página 48