Latest revision as of 15:12, 6 June 2023

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VAR-SOM-MX8 Camera

Testing MIPI-CSI2 cameras

Make sure you have the camera(s) connected to the board before booting it and running any of the pipelines below .
The i.MX family of SOCs uses gstreamer as a multimedia framework. Please refer to https://gstreamer.freedesktop.org/

Camera Probe

Run the following command to list the detected camera devices:

# v4l2-ctl --list-devices

On VAR-SOM-MX8 it should produce the following output:

# v4l2-ctl --list-devices
vpu B0 (platform:):
        /dev/video12
        /dev/video13

mxc-isi (platform:58100000.isi.0):
        /dev/video0
        /dev/video1

mxc-jpeg decoder (platform:58400000.jpegdec):
        /dev/video2

mxc-jpeg decoder (platform:58450000.jpegenc):
        /dev/video3

There is one camera accessible as /dev/video0, attached to the VAR-EXT-CB8 expansion board.

On SPEAR-MX8 this should produce the following output:

# v4l2-ctl --list-devices
vpu B0 (platform:):
        /dev/video12
        /dev/video13

mxc-isi (platform:58100000.isi.0):
        /dev/video0
        /dev/video2

mxc-isi (platform:58140000.isi.4):
        /dev/video1

mxc-jpeg decoder (platform:58400000.jpegdec):
        /dev/video3

mxc-jpeg decoder (platform:58450000.jpegenc):
        /dev/video4

There are two cameras accessible as /dev/video0 and /dev/video1, both attached to the VAR-EXT-CB8 expansion board.

Testing Camera Preview on Display

In the examples below /dev/video1 can be used instead of /dev/video0 on boards with 2 cameras.

480p (640x480):

# gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=640,height=480 ! autovideosink sync=false

NTSC (720x480):

# gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=720,height=480 ! autovideosink sync=false

720p (1280x720):

# gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=1280,height=720 ! autovideosink sync=false

1080p (1920x1080):

# gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=1920,height=1080 ! autovideosink sync=false

QSXGA (2592x1944):

# gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=2592,height=1944 ! autovideosink sync=false

Testing Camera JPEG Snapshot

To capture a JPEG snapshot run one of the pipelines below, depending upon the required picture resolution.
In the examples below /dev/video1 can be used instead of /dev/video0 on boards with 2 cameras.

480p (640x480):

# gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=1 ! video/x-raw,width=640,height=480   ! jpegenc ! filesink location=/tmp/test.jpg

NTSC (720x480):

# gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=1 ! video/x-raw,width=720,height=480   ! jpegenc ! filesink location=/tmp/test.jpg

720p (1280x720):

# gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=1 ! video/x-raw,width=1280,height=720  ! jpegenc ! filesink location=/tmp/test.jpg

1080p (1920x1080):

# gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=1 ! video/x-raw,width=1920,height=1080 ! jpegenc ! filesink location=/tmp/test.jpg

QSXGA (2592x1944):

# gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=1 ! video/x-raw,width=2592,height=1944 ! jpegenc ! filesink location=/tmp/test.jpg

Using 2 cameras simultaneously

The following pipeline is an example of using 2 cameras simultaneously.
In this example a short video stream from each camera is saved as an MJPEG-encoded AVI file.

 # gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=100 ! video/x-raw,width=1920,height=1080 ! jpegenc ! avimux ! filesink location=./test0.avi \
                  v4l2src device=/dev/video1 num-buffers=100 ! video/x-raw,width=1920,height=1080 ! jpegenc ! avimux ! filesink location=./test1.avi

@@ Line 1: / Line 1: @@
-<!-- Set release according to "release" parameter in URL and use RELEASE_SUMO_V1.0_VAR-SOM-MX8 as default
+<!-- Set release according to "release" parameter in URL and use RELEASE_SUMO_V1.1_VAR-SOM-MX8 as default
---> {{#vardefine:RELEASE_PARAM|{{#urlget:release}}}} <!--
+--> {{INIT_RELEASE_PARAM|RELEASE_SUMO_V1.1_VAR-SOM-MX8}} <!--
---> {{#lst:Yocto_Platform_Customization|{{#var:RELEASE_PARAM|RELEASE_SUMO_V1.0_VAR-SOM-MX8}}}} <!--
+--> {{#lst:Yocto_Platform_Customization|{{#var:RELEASE_PARAM}}}} <!--
---> {{PageHeader|{{#var:HARDWARE_NAME}} Camera}} {{DocImage|category1=Yocto|category2={{#var:HARDWARE_NAME}}}} __toc__
+--> {{#lst:Debian_Platform_Customization|{{#var:RELEASE_PARAM}}}} <!--
+--> {{PageHeader|{{#var:HARDWARE_NAME}} Camera}} {{DocImage|category1=Yocto|category2=Debian}} [[Category:{{#var:HARDWARE_NAME}}]] __toc__
 {{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-MX8X | = Testing MIPI-CSI2 and parallel CSI cameras = | = Testing MIPI-CSI2 cameras =}}
 Make sure you have the camera(s) connected to the board before booting it and running any of the pipelines below .<br>
 The i.MX family of SOCs uses gstreamer as a multimedia framework. Please refer to https://gstreamer.freedesktop.org/
+{{#varexists:DEBIAN_NAME|
+== Install Utils ==
+Run the following command to install v4l-utils:
+ # apt-get clean; apt-get update; apt-get install -y v4l-utils
+}}
 == Camera Probe ==
@@ Line 100: / Line 107: @@
 {{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-MX8X |
-{{note|Note: The parallel camera interface maximal framerate at the 1920x1080 and 2592x1944 resolutions is 7.5fps|info}}
+{{note|Note: The parallel camera maximal frame rate at the 1920x1080 and 2592x1944 resolutions is 7.5fps|info}}
 }}
@@ Line 108: / Line 115: @@
 In the examples below /dev/video1 can be used instead of /dev/video0 on boards with 2 cameras.
+{{#ifeq: {{#var:YOCTO_NAME}}|Sumo|
 * 480p (640x480):
   # gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=1 ! video/x-raw,width=640,height=480   ! jpegenc ! filesink location=/tmp/test.jpg
@@ Line 122: / Line 130: @@
 * QSXGA (2592x1944):
   # gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=1 ! video/x-raw,width=2592,height=1944 ! jpegenc ! filesink location=/tmp/test.jpg
+|
+* 480p (640x480):
+ # gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=1 ! video/x-raw,width=640,height=480   ! v4l2jpegenc ! filesink location=/tmp/test.jpg
+* NTSC (720x480):
+ # gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=1 ! video/x-raw,width=720,height=480   ! v4l2jpegenc ! filesink location=/tmp/test.jpg
+* 720p (1280x720):
+ # gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=1 ! video/x-raw,width=1280,height=720  ! v4l2jpegenc ! filesink location=/tmp/test.jpg
+* 1080p (1920x1080):
+ # gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=1 ! video/x-raw,width=1920,height=1080 ! v4l2jpegenc ! filesink location=/tmp/test.jpg
+* QSXGA (2592x1944):
+ # gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=1 ! video/x-raw,width=2592,height=1944 ! v4l2jpegenc ! filesink location=/tmp/test.jpg
+}}
 == Using 2 cameras simultaneously ==
@@ Line 128: / Line 151: @@
 The following pipeline is an example of using 2 cameras simultaneously.<br>
 In this example a short video stream from each camera is saved as an MJPEG-encoded AVI file.
+{{#ifeq: {{#var:YOCTO_NAME}}|Sumo|
+<pre>
   # gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=100 ! video/x-raw,width=1920,height=1080 ! jpegenc ! avimux ! filesink location=./test0.avi \
                    v4l2src device=/dev/video1 num-buffers=100 ! video/x-raw,width=1920,height=1080 ! jpegenc ! avimux ! filesink location=./test1.avi
+</pre>
+|
+<pre>
+ # gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=100 ! video/x-raw,width=1920,height=1080 ! v4l2jpegenc ! avimux ! filesink location=./test0.avi \
+                  v4l2src device=/dev/video1 num-buffers=100 ! video/x-raw,width=1920,height=1080 ! v4l2jpegenc ! avimux ! filesink location=./test1.avi
+</pre>
+}}

MX8 CSI: Difference between revisions