Video Mixer feature implementation on Zynq FPGA

Background

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

VIVADO Design

The VIVADO Block Diagram of the Video Mixer implementation is:

VIVADO SDK Application

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;
}

Output on Zybo-Z710

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:

Detailed Tutorial:

The detail reference tutorial is linked here in PDF format: Goto Tutorial, Xilinx_Zynq-Video-Mixer-Tutorial_LogicTronix_June_2020.pdf

References

• 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