Table of Contents

1 Overview

The primary goal of this Design is to demonstrate the capabilities of VCU hard block present in Zynq UltraScale+ EV devices. The TRD will serve as a platform to tune the performance parameters of VCU and arrive at optimal configurations for encoder and decoder blocks. 

This design supports the following video interfaces:

Sources:

• Test pattern generator (TPG) implemented in the PL.
• HDMI-Rx capture pipeline implemented in the PL.
• MIPI CSI-2 Rx capture pipeline implemented in the PL.
• File source (SD card, USB storage, SATA hard disk).
• Stream-In from network or internet.

Sinks:

• DP Tx display pipeline in the PS.
• HDMI-Tx display pipeline implemented in the PL.

VCU Codec:

• Video Encode/Decode capability using VCU hard block in PL
  • AVC/HEVC encoding
  • Encoder/decoder parameter configuration.
  • Demonstrate the multi-stream capability of VCU at 4k 60 Hz throughput

Streaming Interfaces:

• 1G Ethernet PS GEM 

Video format:

• NV12

The below figure shows the TRD block diagram.

• Demonstrate the multi-stream capability of VCU at 4k 60 Hz throughput.
  • Supports 2-4KP30 multi-stream feature with any 2 of HDMI-Rx, TPG, and MIPI as the input source and HDMI-Tx as display pipeline.
  • Supports 4-1080p60 multi-stream feature with 3 HDMI-Rx and 1 MIPI as the input source and HDMI-Tx as display pipeline.
  • Supports 8-1080p30 multi-stream feature with 7 HDMI-Rx and 1 MIPI as the input source and HDMI-Tx as display pipeline.

Other features:

• This design supports 8 channel memory-based SCD(Scene Change Detection) IP. SCD can be enabled or disabled through configuration

Supported Resolution:

The table below provides the supported resolution from GUI and command-line app in this design.

√ - Supported
NA – Not applicable
x – Not supported

The below table gives information about the features supported in this design. 

NOTE: DP will support a max resolution of 4kp30 

            TPG will not support 1080p30 resolution mode.

The below figure shows the VCU TRD design hardware block diagram.

The below figure shows the VCU TRD design software block diagram.

1.1 Board Setup

Refer below link for Board Setup

• Zynq UltraScale+ MPSoC VCU TRD 2019.2 Board Setup

root@zcu106_vcu_trd:/media/card# xmedia-ctl -p -d /dev/mediaX
Media controller API version 4.19.0

Media device information
------------------------
driver          xilinx-video
model           Xilinx Video Composite Device
serial          
bus info        
hw revision     0x0
driver version  4.19.0

Device topology
- entity 1: vcap_hdmi output 0 (1 pad, 1 link)
            type Node subtype V4L flags 0
            device node name /dev/video0 -----> Video node for HDMI Rx source
        pad0: Sink
                <- "a0080000.v_proc_ss":1 [ENABLED]

- entity 5: a0080000.v_proc_ss (2 pads, 2 links)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev21
        pad0: Sink
                [fmt:RBG888_1X24/3840x2160 field:none]
                <- "a0000000.v_hdmi_rx_ss":0 [ENABLED]
        pad1: Source
                [fmt:VYYUYY8_1X24/3840x2160 field:none]
                -> "vcap_hdmi output 0":0 [ENABLED]

- entity 8: a0000000.v_hdmi_rx_ss (1 pad, 1 link)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev22
        pad0: Source
                [fmt:RBG888_1X24/3840x2160 field:none colorspace:srgb]
                [dv.caps:BT.656/1120 min:0x0@25000000 max:4096x2160@297000000 stds:CEA-861,DMT,CVT,GTF caps:progressive,reduced-blanking,custom]
                [dv.query:no-link] -----> HDMI Rx Link Status
                -> "a0080000.v_proc_ss":0 [ENABLED]

NOTE: Here "dv.query:no-link" under "v_hdmi_rx_ss" node shows HDMI-Rx source is not connected or HDMI-Rx source is not active(Try waking up the device by pressing a key on remote).

• Follow the below steps to switch the HDMI-Rx resolution from 1080p60 to 4kp60.
  • Check current HDMI Input Source Resolution (1080p60) by following the above-mentioned steps.
  • Run vcu_gst_app for current HDMI resolution (1080p60) by executing the following command.

$ vcu_gst_app /media/card/config/input.cfg

Below configurations needs to be set in input.cfg for HDMI-1080p60.

Common Configuration    : START
Num Of Input            : 1
Output                  : HDMI
Out Type                : Display
Frame Rate              : 60
Exit

Input Configuration     : START
Input Num               : 1
Input Type              : hdmi
Raw                     : TRUE
Width                   : 1920
Height                  : 1080
Exit

• • Change Resolution of HDMI Input Source from 1080p60 to 4kp60 by following below steps.
    • Set the HDMI source resolution to 4kp60 (Homepage → settings → display & Sound → Resolution → change to 4kp60).
    • Save the configuration to take place the change.
  • Verify the desired HDMI Input Source Resolution (4kp60) by following the above-mentioned steps.

• If HDMI Tx link-up issue is observed after Linux booting, use the following command:

$ modetest -D a0070000.v_mix -s 41:3840x2160-60@BG24 &

• Run the following gst-launch-1.0 command to display passthrough pipeline. Where "videoX" indicates a video node for the input source.

$ gst-launch-1.0 v4l2src device=/dev/videoX io-mode=4 ! video/x-raw, width=3840, height=2160, format=NV12, framerate=60/1 ! queue ! kmssink bus-id="a0070000.v_mix"

• Run the following gst-launch-1.0 command to display processed pipeline (capture → scd → encode → decode → display) on HDMI-Tx. Where "videoX" indicates a video node for the input source.

$ gst-launch-1.0 v4l2src device=/dev/videoX io-mode=4 ! video/x-raw, width=3840, height=2160, format=NV12, framerate=60/1 ! xilinxscd io-mode=5 ! omxh265enc qp-mode=auto gop-mode=basic gop-length=60 b-frames=0 target-bitrate=60000 num-slices=8 control-rate=constant prefetch-buffer=true low-bandwidth=false filler-data=true cpb-size=1000 initial-delay=500 ! video/x-h265, profile=main, alignment=au ! queue ! omxh265dec internal-entropy-buffers=5 low-latency=0 ! queue max-size-bytes=0 ! kmssink bus-id="a0070000.v_mix"

• Run the following gst-launch-1.0 command to record video using GStreamer pipeline. Where "videoX" indicates a video node for the input source.