This reference tutorial is on how to implement multiple feature of video mixer including alpha blending , logo layer and using multiple TPG layer over the main input stream. We have used Digilent Zybo Z7-10 FPGA board for implementing this features while we also have separate demo and implementation for ZedBoard and MPSoC FPGA’s.

The major feature of Video Mixer are:
• Supports alpha-blending of nine video/graphics and logo layers
• Optional logo (in block RAM (BRAM)) layer with color transparency
• Layers can either be memory mapped AXI4 interface or AXI4-Stream
• Provides programmable background color
• Provides scaling of layers by 1x, 2x, or 4x
• Optional built-in color space conversion
• Supports RGB, YUV 444, YUV 422, YUV 420
• Supports 8, 10, 12, and 16 bits per color component
• Supports spatial resolutions from 64 × 64 up to 4,096 × 2,160
• Supports 4K60 in all supported device families
The VIVADO Block Diagram of the Video Mixer implementation is:

Libraries and Main function of the SDK application are herewith:
#include <stdio.h>
#include "platform.h"
#include "xil_printf.h"
#include "xparameters.h"
#include "xv_mix.h"
#include "xv_mix_l2.h"
#include "xgpio.h"
#include "sleep.h"
#include "xuartps.h"
#include "xil_cache.h"
#include "xv_tpg.h"
#include "xscugic.h"
#include "xvtc.h"
#define LED 0x01
int main() {
init_platform();
/* Setup Reset line */
gpio_hlsIpReset = (u32*) XPAR_RESET_GPIO_BASEADDR;
//Release reset line
*gpio_hlsIpReset = 1;
SetupInterrupts();
driverInit();
detectHdmi();
Xil_ExceptionEnable();
resetIp();
configVtcDet();
configVtcGen();
ConfigMixer(&VidStream);
ConfigTpg(&VidStream);
RunMixer();
cleanup_platform();
return 0;
}
In the reference tutorial we have showed different 7 cases of output in different configuration or feature enabled on video mixer. One of example output of video mixer feature implementation is as follows:

The detail reference tutorial is linked here in PDF format: Goto Tutorial, Xilinx_Zynq-Video-Mixer-Tutorial_LogicTronix_June_2020.pdf
Reference of this Tutorial are:
- Xilnx Video Series: Video-Series-32-Visualizing-the-Video-Mixer-example-design
- Xilinx, “Video Mixer v3.0 LogiCORE IP Product Guide,” Xilinx, 5 December 2018.
For any queries or complete VIVADO project of this implementation, you can write us at: info@logictronix.com
#video #mixer #feature #alpha #blending #FPGA #Zynq #logo #TPG #Zybo #ZedBoard #MPSoC