HDMI-IN

The Neardi-3588 has an HDMI-IN port, which can be developed to implement the HDMI IN function through the HDMI RX module.

  • Supported platforms: Android, Linux platforms

  • Supports up to 4K@60fps resolution

  • Supports hot-plugging for HDMI IN, as well as recording functionality

  • Supports configurable EDID, HDCP1.4/HDCP2.3, and CEC

Using HDMI-IN on Android

The default version includes HDMI-IN functionality. Burn the Neardi-3588 firmware from Baidu Netdisk For the burning method, please refer to the chapter 《 Upgrading Firmware with a Type-C Cable》.

After burning, open the system HDMI IN application to verify functionality.

The source code path for HDMIIN APK:

rkCamera2： SDK/packages/apps/rkCamera2

Using HDMI-IN on Linux

The default node for Neardi-3588 HDMI-IN is /dev/video40。

Execute the following command:

export GST_VIDEO_CONVERT_USE_RGA=1
gst-launch-1.0 v4l2src device=/dev/video40 ! kmssink plane-id=54 -v

The plane-id is obtained through the following command:

cat /sys/kernel/debug/dri/0/state | grep plane

Obtain the plane-id with the following command:

neardi@LPA3588:~$ gst-launch-1.0 v4l2src device=/dev/video40 ! kmssink plane-id=54 -v
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
/GstPipeline:pipeline0/GstKMSSink:kmssink0: display-width = 1920
/GstPipeline:pipeline0/GstKMSSink:kmssink0: display-height = 1080
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0.GstPad:src: caps = video/x-raw, format=(string)NV24, width=(int)1920, height=(int)1080, framerate=(fraction)120/1, interlace-mode=(string)progressive, colorimetry=(string)bt709
/GstPipeline:pipeline0/GstKMSSink:kmssink0.GstPad:sink: caps = video/x-raw, format=(string)NV24, width=(int)1920, height=(int)1080, framerate=(fraction)120/1, interlace-mode=(string)progressive, colorimetry=(string)bt709
Redistribute latency...
^Chandling interrupt.
Interrupt: Stopping pipeline ...
Execution ended after 0:00:18.453012117
Setting pipeline to NULL ...
Freeing pipeline ...

FAQ

How to obtain device information

neardi@LPA3588:~$ v4l2-ctl -d /dev/video40  -V -D
Driver Info:
	Driver name      : rk_hdmirx
	Card type        : rk_hdmirx
	Bus info         : fdee0000.hdmirx-controller
	Driver version   : 5.10.110
	Capabilities     : 0x84201000
		Video Capture Multiplanar
		Streaming
		Extended Pix Format
		Device Capabilities
	Device Caps      : 0x04201000
		Video Capture Multiplanar
		Streaming
		Extended Pix Format
Format Video Capture Multiplanar:
	Width/Height      : 1920/1080
	Pixel Format      : 'NV24' (Y/CbCr 4:4:4)
	Field             : None
	Number of planes  : 1
	Flags             : premultiplied-alpha, 0x000000fe
	Colorspace        : SMPTE 170M
	Transfer Function : Unknown (0x000000b8)
	YCbCr/HSV Encoding: Unknown (0x000000ff)
	Quantization      : Default
	Plane 0           :
	   Bytes per Line : 1920
	   Size Image     : 6220800

HDMI-IN not displaying

Verify with v4l2-ctl image capture

Scenario one:

v4l2-ctl -d /dev/video40  --set-fmt-video=width=1920,height=1080,pixelformat=BGR3  --stream-mmap=3  --stream-skip=3  --stream-to=/tmp/1920x1080-hdmiin.out  --stream-count=1  --stream-poll >/dev/null

<<<<

If it returns <<<<,it indicates that the hardware and HDMI cable are normal. Then check the topology structure and Format.

Check the Format:

v4l2-ctl -d 0 -V

Scenario two:

neardi@LPA3588:~$ v4l2-ctl -d /dev/video40  --set-fmt-video=width=1920,height=1080,pixelformat=BGR3  --stream-mmap=3  --stream-skip=3  --stream-to=/tmp/1920x1080-hdmiin.out  --stream-count=1  --stream-poll >/dev/null
select timeout

If it returns select timeout，check whether the HDMIIN cable is firmly plugged in or try a different cable.

How to debug audio

You can record the input audio using the tinycap command.

  • Check the sound card devices

neardi@LPA3588:~$ cat /proc/asound/card*
cat: /proc/asound/card0: Is a directory
cat: /proc/asound/card1: Is a directory
cat: /proc/asound/card2: Is a directory
 0 [rockchipes8388 ]: rockchip_es8388 - rockchip,es8388
                      rockchip,es8388
 1 [rockchiphdmiin ]: rockchip_hdmiin - rockchip,hdmiin
                      rockchip,hdmiin
 2 [rockchiphdmi0  ]: rockchip-hdmi0 - rockchip-hdmi0
                      rockchip-hdmi0

The sound card number for hdminrx is 1，You can run the following command to record and play audio when there is audio input on HDMI-IN.

  • Record audio

neardi@LPA3588:~$ tinycap /sdcard/test.wav -D 1 -d 0