This design-module demonstrates how to add a data-copy (also known as By-Pass) accelerator between HDMI Video Capture (HDMI-Rx) and HDMI Display (HDMI-Tx) pipelines in PL using SDSoC tool. The accelerator function (which simply copy the input data to output) is translated to RTL using the Vivado HLS compiler (which is part of SDSoC tool).
Sources:
Sinks:
VCU Codec:
Streaming Interfaces:
Supported Resolution:
The table below provides the supported resolution from a command line app in this design.
Resolution | Command Line | |
Single Stream | Multi-stream | |
4kp60 | √ | NA |
4kp30 | √ | NA |
1080p60 | √ | NA |
1080p30 | √ | NA |
√ - Supported
NA – Not applicable
x – Not supported
The below table gives information about the features supported in this design.
Pipeline | Input source | Output Type | Resolution | VCU codec |
---|---|---|---|---|
Capture --> bypass --> Display (Passthrough pipeline) With and without bypass plugin | HDMI-Rx | HDMI-Tx | 4KP/1080p | None |
Stream-Out pipeline with and without bypass plugin | HDMI-Rx | Stream-Out | 4K/1080p | HEVC/AVC |
File/Streaming Playback pipeline with and without bypass plugin | File Source/ Stream-In | HDMI-Tx | 4K/1080p | HEVC/AVC |
Capture--> Encode--> Decode--> Display without bypass plugin | HDMI-Rx | HDMI-Tx | 4K/1080p | HEVC/AVC |
Record pipeline without bypass plugin | HDMI-Rx | File Sink | 4K/1080p | HEVC/AVC |
For the overview, software tools, system requirements and design files, follow the link below:
The below figure shows the VCU TRD design hardware block diagram.
The below figure shows the HDMI Video Capture and HDMI Display with SDSoC support design software block diagram.
Refer below link for Board Setup
The TRD package has ready-to-test SD-card images that enable the user to run the demo.
Refer below link to download all TRD contents.
TRD package contents are placed in the following directory structure.
TRD package contents specific to this design are placed in the following directory structure. The user needs to copy all the files from the $TRD_HOME/images/vcu_sdx/ to FAT32 formatted SD card directory.
└── rdf0428-zcu106-vcu-trd-2018-3 ├── apu │ ├── apps │ └── vcu_petalinux_bsp ├── documentation ├── images │ ├── vcu_sdx │ │ ├── autostart.sh │ │ ├── bin │ │ ├── BOOT.BIN │ │ ├── config │ │ ├── image.ub │ │ ├── system.dtb │ │ └── vcu ├── pl │ ├── constrs │ ├── pre-built │ │ ├── vcu_sdx │ ├── Readme.txt │ ├── scripts │ │ └── vcu_sdx.tcl │ └── srcs └── README.txt |
Configuration files(input.cfg) for various resolutions are placed in the following directory structure in /media/card.
config/ ├── 4kp60 │ ├── Display │ ├── Stream-out │ └── Stream-in ├── 4kp30 │ ├── Display │ ├── Stream-out │ └── Stream-in ├── 1080p60 │ ├── Display │ ├── Stream-out │ └── Stream-in └── input.cfg |
The vcu_gst_app is a command line multi-threaded Linux application. The command line application requires an input configuration file (input.cfg) which is a plain text file.
To execute the application, run the following command:
% vcu_gst_app <path to *.cfg file> |
Example:
4kp60 Passthrough pipeline execution with a bypass filter
% vcu_gst_app /media/card/config/input.cfg |
4kp60 HEVC_HIGH Display Pipeline execution
% vcu_gst_app /media/card/config/4kp60/Display/Single_4kp60_HEVC_HIGH.cfg |
4kp60 HEVC_HIGH Stream-out Pipeline execution
% vcu_gst_app /media/card/config/4kp60/Stream-out/Single_4kp60_HEVC_HIGH.cfg |
4kp60 HEVC_HIGH Stream-in Pipeline execution
% vcu_gst_app /media/card/config/4kp60/Stream-in/input.cfg |
NOTE: Make sure HDMI-Rx should be configured to 4kp60 mode.
To measure the latency of the pipeline, run the below command. The latency data is huge, so dump it to a file.
% GST_DEBUG="GST_TRACER:7" GST_TRACERS="latency;scheduletime" ./vcu_gst_app ./input.cfg >& dump_log.txt |
Refer below link for Build Flow tutorial of VCU PetaLinux BSP:
This tutorial shows how to build the By-Pass accelerator sample with/without HW acceleration based on the VCU TRD SDSoC platform.
% source $TRD_HOME/apu/vcu_petalinux_bsp/sdk/environment-setup-aarch64-xilinx-linux |
Create a new workspace for the bypass sdsoc and GStreamer plugin projects.
% cd $TRD_HOME/apu/ws_bypass % sdx -workspace . |
% cp bypass/Release/sd_card/BOOT.BIN $TRD_HOME/images/vcu_sdx/ % cp bypass/Release/sd_card/image.ub $TRD_HOME/images/vcu_sdx/ % cp bypass/Release/sd_card/libbypass.so $TRD_HOME/images/vcu_sdx/lib/ % cp gst/allocators/Debug/libgstsdxallocator.so gst/base/Debug/libgstsdxbase.so $TRD_HOME/images/vcu_sdx/lib % cp gst/plugins/gstsdxbypass/Debug/libgstsdxbypass.so $TRD_HOME/images/vcu_sdx/lib/ |
2.1 Known Issues
Video streaming:
Performance: AVC Encoder settings:
Quality: Low bitrate AVC encoding:
The example configuration files are stored at /media/card/config/ folder.
Common Configuration:
It is the starting point of common configuration.
Num of Input:
Provide the number of input. this is always 1 for this design.
Output:
Select the video interface.
Options: HDMI or DP
Out Type:
Options: display and stream
Display Rate:
Pipeline frame rate.
Options: 30 FPS or 60 FPS for each stream.
Exit:
It indicates to the application that the configuration is over.
Input Configuration:
It is the starting point of input configuration.
Input Num:
Starting Nth input configuration.
Options: 1
Input Type:
Input source type.
Options: HDMI, File, Stream
Uri:
File path or Network URL. Applicable for file playback and stream-in pipeline only. Supported file formats for playback are ts, mp4 and mkv.
Options: file:///media/usb/abc.ts (for file path), udp://192.168.26.89:5004/ (for Network streaming, Here 192.168.26.89 is IP address and 5004 is port no)
Raw:
To tell pipeline is processed or pass-through.
Options: True, False
Width:
The width of the live source.
Options: 3840, 1920
Height:
The height of the live source.
Options: 2160, 1080
Accelerator Flag:
Enable/disable SDx accelerator. In this release, the accelerator will work as a bypass filter.
Options: True, False
Exit:
It indicates to the application that the configuration is over.
Encoder Configuration:
It is the starting point of encoder configuration.
Encoder Num:
Starting Nth encoder configuration.
Options: 1
Encoder Name:
Name of the encoder.
Options: AVC, HEVC
Profile:
Name of the profile.
Options: baseline, main or high for AVC. Main for HEVC.
Rate Control:
Rate control options.
Options: CBR, VBR, and low-latency.
Filler Data:
Filler Data NAL units for CBR rate control.
Options: True, False
QP:
QP control mode used by the VCU encoder.
Options: Uniform, Auto
L2 Cache:
Enable or Disable L2Cache buffer in encoding process.
Options: True, False
Latency Mode:
Encoder latency mode.
Options: normal, sub_frame
Low Bandwidth:
If enabled, decrease the vertical search range used for P-frame motion estimation to reduce the bandwidth.
Options: True, False
Gop Mode:
Group of Pictures mode.
Options: Basic, low_delay_p, low_delay_b
Bitrate:
Target bitrate in Kbps
Options: 1-60000
B Frames:
Number of B-frames between two consecutive P-frames
Options: 0-4
Slice:
The number of slices produced for each frame. Each slice contains one or more complete macroblock/CTU row(s). Slices are distributed over the frame as regularly as possible. If slice-size is defined as well more slices may be produced to fit the slice-size requirement.
Options:
4-22 4kp resolution with HEVC codec
4-32 4kp resolution with AVC codec
4-32 1080p resolution with HEVC codec
4-32 1080p resolution with AVC codec
GoP Length:
The distance between two consecutive I frames
Options: 1-1000
Format:
The format of input data.
Options: NV12
Preset:
Options: HEVC_HIGH, HEVC_MEDIUM, HEVC_LOW, AVC_HIGH, AVC_MEDIUM, AVC_LOW, Custom
Exit
It indicates to the application that the configuration is over.
Record Configuration:
It is the starting point of record configuration.
Record Num:
Starting Nth record configuration.
Options: 1
Out-File Name:
Record file path.
Options: /media/usb/abc.ts
Duration:
Duration in minutes.
Options: 1-3
Exit
It indicates to the application that the configuration is over.
Streaming Configuration:
It is the starting point of streaming configuration.
Streaming Num:
Starting Nth Streaming configuration.
Options: 1.
Host IP:
The host to send the packets to
Options: 192.168.25.89 or Windows PC IP
Port:
The port to send the packets to
Options: 5004,5008,5012 and 5016.
Exit
It indicates to the application that the configuration is over.
$ xmedia-ctl -p -d /dev/media0 |
When HDMI source is connected to 4KP60 resolution, it shows:
root@zcu106_vcu_trd:/media/card# xmedia-ctl -p -d /dev/media0 Media controller API version 4.14.0 Media device information ------------------------ driver xilinx-video model Xilinx Video Composite Device serial bus info hw revision 0x0 driver version 4.14.0 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-subdev0 pad0: Sink [fmt:VYYUYY8_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-subdev1 pad0: Source [fmt:VYYUYY8_1X24/3840x2160 field:none colorspace:rec709] [dv.caps:BT.656/1120 min:0x0@25000000 max:4096x2160@297000000 stds:CEA-861,DMT,CVT,GTF caps:progressive,reduced-blanking,custo] [dv.detect:BT.656/1120 3840x2160p60 (4400x2250) stds:CEA-861 flags:CE-video] -----> Resolution and Frame-rate of HDMI Rx source -> "a0080000.v_proc_ss":0 [ENABLED] |
NOTE: Check resolution and frame-rate of "dv.detect" under "v_hdmi_rx_ss" node.
When HDMI source is not connected, it shows:
root@zcu106_vcu_trd:/media/card# xmedia-ctl -p -d /dev/media0 Media controller API version 4.14.0 Media device information ------------------------ driver xilinx-video model Xilinx Video Composite Device serial bus info hw revision 0x0 driver version 4.14.0 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-subdev0 pad0: Sink [fmt:VYYUYY8_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-subdev1 pad0: Source [fmt:VYYUYY8_1X24/3840x2160 field:none colorspace:rec709] [dv.caps:BT.656/1120 min:0x0@25000000 max:4096x2160@297000000 stds:CEA-861,DMT,CVT,GTF caps:progressive,reduced-blanking,custo] [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).
$ 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 |
$ modetest -D a0070000.v_mix -s 39:3840x2160-60@AR24 -w 35:"alpha":0 |
$ gst-launch-1.0 v4l2src device=/dev/video0 io-mode=4 ! video/x-raw, width=3840, height=2160, format=NV12, framerate=60/1 ! queue ! kmssink bus-id="a0070000.v_mix" |
$ gst-launch-1.0 uridecodebin uri="file:///media/usb/test.ts" ! queue max-size-bytes=0 ! kmssink bus-id="a0070000.v_mix" |
NOTE: File location should be USB-3.0 to avoid the read-write bandwidth issue.
$ gst-launch-1.0 v4l2src device=/dev/video0 io-mode=4 ! video/x-raw, format=NV12, width=3840, height=2160, framerate=60/1 ! 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 latency-mode=normal ! queue ! mpegtsmux alignment=7 name=mux ! rtpmp2tpay ! udpsink host=192.168.25.89 port=5004 |
NOTE: Here 192.168.25.89 is host/client IP address and 5004 is port no.
$ gst-launch-1.0 udpsrc port=5004 buffer-size=60000000 caps="application/x-rtp, clock-rate=90000" ! rtpjitterbuffer latency=1000 ! rtpmp2tdepay ! tsparse ! video/mpegts ! tsdemux name=demux ! queue ! h265parse ! omxh265dec internal-entropy-buffers=5 latency-mode=normal ! queue max-size-bytes=0 ! kmssink bus-id="a0070000.v_mix" |
Notes for gst-launch-1.0 commands:
When HDMI Input Source is NVIDIA SHIELD
$ xmedia-ctl -d /dev/media0 -V "\"a0080000.v_proc_ss\":0 [fmt:RBG888_1X24/3840x2160 field:none]" $ xmedia-ctl -d /dev/media0 -V "\"a0080000.v_proc_ss\":1 [fmt:VYYUYY8_1X24/3840x2160 field:none]" |
NOTE: Make sure NVIDIA SHIELD is configured for 4kp resolution and RGB888 color format.
When HDMI Input Source is ABOX
$ xmedia-ctl -d /dev/media0 -V "\"a0080000.v_proc_ss\":0 [fmt:VYYUYY8_1X24/3840x2160 field:none]" $ xmedia-ctl -d /dev/media0 -V "\"a0080000.v_proc_ss\":1 [fmt:VYYUYY8_1X24/3840x2160 field:none]" |
NOTE: Make sure ABOX is configured for 4kp resolution and VYYUYY8 color format.