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Diffstat (limited to 'Documentation/video4linux/vivid.txt')
| -rw-r--r-- | Documentation/video4linux/vivid.txt | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/Documentation/video4linux/vivid.txt b/Documentation/video4linux/vivid.txt index eeb11a28e4fc..6cfc8541a362 100644 --- a/Documentation/video4linux/vivid.txt +++ b/Documentation/video4linux/vivid.txt @@ -221,12 +221,11 @@ ccs_out_mode: specify the allowed video output crop/compose/scaling combination key, not quality. multiplanar: select whether each device instance supports multi-planar formats, - and thus the V4L2 multi-planar API. By default the first device instance - is single-planar, the second multi-planar, and it keeps alternating. + and thus the V4L2 multi-planar API. By default device instances are + single-planar. This module option can override that for each instance. Values are: - 0: use alternating single and multi-planar devices. 1: this is a single-planar instance. 2: this is a multi-planar instance. @@ -641,6 +640,21 @@ Colorspace: selects which colorspace should be used when generating the image. Changing the colorspace will result in the V4L2_EVENT_SOURCE_CHANGE to be sent since it emulates a detected colorspace change. +Y'CbCr Encoding: selects which Y'CbCr encoding should be used when generating + a Y'CbCr image. This only applies if the CSC Colorbar test pattern is + selected, and if the format is set to a Y'CbCr format as opposed to an + RGB format. + + Changing the Y'CbCr encoding will result in the V4L2_EVENT_SOURCE_CHANGE + to be sent since it emulates a detected colorspace change. + +Quantization: selects which quantization should be used for the RGB or Y'CbCr + encoding when generating the test pattern. This only applies if the CSC + Colorbar test pattern is selected. + + Changing the quantization will result in the V4L2_EVENT_SOURCE_CHANGE + to be sent since it emulates a detected colorspace change. + Limited RGB Range (16-235): selects if the RGB range of the HDMI source should be limited or full range. This combines with the Digital Video 'Rx RGB Quantization Range' control and can be used to test what happens if @@ -975,9 +989,8 @@ is set, then the alpha component is only used for the color red and set to 0 otherwise. The driver has to be configured to support the multiplanar formats. By default -the first driver instance is single-planar, the second is multi-planar, and it -keeps alternating. This can be changed by setting the multiplanar module option, -see section 1 for more details on that option. +the driver instances are single-planar. This can be changed by setting the +multiplanar module option, see section 1 for more details on that option. If the driver instance is using the multiplanar formats/API, then the first single planar format (YUYV) and the multiplanar NV16M and NV61M formats the @@ -1021,7 +1034,7 @@ the output overlay for the video output, turn on video looping and capture to see the blended framebuffer overlay that's being written to by the second instance. This setup would require the following commands: - $ sudo modprobe vivid n_devs=2 node_types=0x10101,0x1 multiplanar=1,1 + $ sudo modprobe vivid n_devs=2 node_types=0x10101,0x1 $ v4l2-ctl -d1 --find-fb /dev/fb1 is the framebuffer associated with base address 0x12800000 $ sudo v4l2-ctl -d2 --set-fbuf fb=1 |