Issue in Video Streaming with gadget webcam module g_webcam in i.MX8 EVK

sunithas — Mon, 29 Oct 2018 09:37:50 GMT

Issue:
Not able to stream video in VLC from the sample mjpg file using gadget webcam module.
DWC3 controller stops submitting the USB Request back to the g_webcam module.

Followed below steps :

1.Download i.MX8 linux source 4.9.88
[git clone https://source.codeaurora.org/external/imx/linux-imx -b imx_4.9.88_2.0.0_ga]
2.Download UVC gadget test application [https://github.com/lintwins/uvc-gadget]

2. Enable g_webcam module in linux kernel configuration
Device Drivers > USB Support > USB Gadget Support > USB Webcam Function

3.Compilation
3.1. Cross-Compile i.MX8 source code
$ sudo apt-get install crossbuild-essential-arm64
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-
3.2. Update KERNEL_DIR, CROSS_COMPILE, ARCH in the UVC gadget test application Makefile
3.3. Cross-Compile UVC gadget application for i.MX8 platform
$ make

4. i.MX8 SD card preparation
4.1
4.1 Copy 'g_webcam.ko' and 'usb_f_uvc.ko' to /media/user/rootfs/home/root/
4.2. Copy 'uvc-gadget' executable /media/user/rootfs/home/root/
4.3. Copy sample mjpg file [640x360/1280x720] to /media/user/rootfs/home/root/

5. Insert SD card and power ON the i.MX8 platform

6. Execution
6.1. Load gadget webcam modules
$ insmod usb_f_uvc.ko
$ insmod g_webcam.ko streaming_maxpacket=1024
6.2. Run uvc gadget test application
$ ./uvc-gadget -d /dev/videoX -i <sample-mjpg-file-name>
ex: $ ./uvc-gadget -d /dev/video1 -i 1280x720.mjpg (or)
$ ./uvc-gadget -d /dev/video1 -i 640x360.mjpg
Run VLC on the streaming linux PC and start the stream with the corresponding resolution 1280x720 (or) 640x360

Please suggest if I have missed anything or where I am going wrong.

Thanks,

Sunitha

Re: Issue in Video Streaming with gadget webcam module g_webcam in i.MX8 EVK

art — Thu, 08 Nov 2018 09:00:51 GMT

Does your host PC ever detect the i.MX8 hardware as the UVC device? Please check.

Re: Issue in Video Streaming with gadget webcam module g_webcam in i.MX8 EVK

sunithas — Thu, 13 Dec 2018 06:04:00 GMT

Hi Arthur,

Yes. Host PC detected i.MX8 Hardware as UVC device.

When we start streaming video data, gadget controller driver stopped submitting usb request to the gadget driver

Regards,

Sunitha

i.MX ProcessorsのトピックRe: Issue in Video Streaming with gadget webcam module g_webcam in i.MX8 EVK

Issue in Video Streaming with gadget webcam module g_webcam in i.MX8 EVK

Re: Issue in Video Streaming with gadget webcam module g_webcam in i.MX8 EVK

Re: Issue in Video Streaming with gadget webcam module g_webcam in i.MX8 EVK