HDMI-IN

Neardi-3588 有一个 HDMI-IN 接口，通过HDMI RX模块开发实现HDMI IN功能的⽅法。

支持平台：Android、Linux平台
最高支持4K@60fps的分辨率
⽀持HDMI IN热拔插，⽀持录像功能
⽀持EDID可配置，⽀持HDCP1.4/HDCP2.3，⽀持CEC

Android 使用 HDMI-IN

默认版本有HDMI-IN功能，烧录Neardi-3588 最新固件百度网盘烧录方法请参阅《使用Type-C线升级固件》一章。

烧录完成后打开系统HDMI IN应用，即可验证功能。

HDMIIN APK对应的源码路径：

rkCamera2： SDK/packages/apps/rkCamera2

Linux 使用 HDMI-IN

Neardi-3588 HDMI-IN 默认节点是 /dev/video40。

执行以下命令：

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

plane-id通过以下命令获取：

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

执行成功返回结果：

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

如何获取设备信息

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不显示

通过v4l2-ctl抓图验证

现象一：

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

<<<<

返回<<<<说明硬件、HDMI线缆正常，再查看拓扑结构和Format。

查看Format：

v4l2-ctl -d 40 -V

现象二：

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

返回select timeout，检查HDMIIN线缆是否插紧或换一根线。

音频如何调试

可以通过tinycap命令去录制输入的音频。

查看声卡设备

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

hdminrx的声卡号为1，可以在 HDMI-IN 有音频输入的时候运行以下命令来录制和播放音频。

录制音频

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