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Quadro SDI Output PG-03776-001_v06
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7 VIDEO COMPOSITING
The Quadro SDI supports programmable 2D compositing. This operating mode
combines the image data from the incoming video stream with the GPU-rendered image
based upon the values in a third image known as a matte or key channel. The Quadro
SDI supports the following compositing methods.
Note: 2D compositing is any supported when the signal format of the incoming
video matches the outgoing signal format and the outgoing SDI video signal is
genlocked to the input signal. Scaling or retiming the video input to match the
video output signal format is not supported.
7.1 ALPHA COMPOSITING
In the case of alpha compositing, the application provides the key / matte channel per
field / frame in the alpha channel of the OpenGL graphics stream. When the application
enables alpha compositing via the API, the Quadro SDI simply executes the function
below to compute the final pixel color.
output color = input video color * (1 - alpha) + input graphics color * (alpha)
When the value of the key or matte is strictly 1 or 0, the compositing is complete
replacement. When the key value is between 0 and 1, the two images (video and
graphics) would be blended. The above formula is executed for each and every pixel in
the SDI output stream.
- QUADRO SDI OUTPUT 1
- DOCUMENT CHANGE HISTORY 2
- TABLE OF CONTENTS 3
- LIST OF TABLES 5
- 1 GETTING STARTED 6
- 2 DEVICE CONTROL APIS 7
- Device Control APIs 8
- NV-CONTROL X 8
- 3 OPENGL EXTENSIONS 9
- 4 DEVICE SETUP AND CONTROL 10
- Output Capabilities 12
- Device Setup and Control 16
- &val); 16
- 5 DATA TRANSFER 17
- Card on Windows 18
- 5.3 PBUFFER INITIALIZATION 21
- 5.5 SENDING FBO DATA 28
- 5.6 SENDING PBUFFER DATA 31
- TRUE to 32
- THE VIDEO DEVICE 33
- 6 ANCILLARY DATA 35
- 6.2 BASICS 36
- 6.3 TIME CODE 37
- 6.4 AUDIO 38
- 6.4.4 Specifying Audio Data 42
- 6.5 CUSTOM DATA 45
- 6.6 CLEAN UP 46
- 7 VIDEO COMPOSITING 47
- 7.2 CHROMA-KEYING 48
- 7.3 LUMA-KEYING 50
- CONFIGURATION 51
- 9 DEVICE FEEDBACK 52
- in order to queue buffers 53
- 10 ADVANCED TOPICS 58
- Independent Video Channels 59
- 10.3 COLOR SPACE CONVERSION 60
- 10.3.1 Coefficients 61
- 10.3.2 Scale 61
- 10.3.3 Offset 62
- Windows 63
- Pbuffer Creation 69
- COMPONENT 72
- 10.7 DATA INTEGRITY CHECK 73
- Termination on Windows 75
- 11 NV_PRESENT_VIDEO 78
- 12 NVAPI VIO 80
- NVAPI VIO 109
- 13 NV CONTROL VIO CONTROLS 110
- 14 ANCILLARY DATA API 138
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