linux-kernel - Re: [PATCH v5 00/39] i.MX Media Driver

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Date:   Sat, 18 Mar 2017 12:58:27 -0700
From:   Steve Longerbeam <steve_longerbeam@...tor.com>
To:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Steve Longerbeam <slongerbeam@...il.com>
CC:     <robh+dt@...nel.org>, <mark.rutland@....com>,
        <shawnguo@...nel.org>, <kernel@...gutronix.de>,
        <fabio.estevam@....com>, <mchehab@...nel.org>,
        <hverkuil@...all.nl>, <nick@...anahar.org>,
        <markus.heiser@...marIT.de>, <p.zabel@...gutronix.de>,
        <laurent.pinchart+renesas@...asonboard.com>, <bparrot@...com>,
        <geert@...ux-m68k.org>, <arnd@...db.de>,
        <sudipm.mukherjee@...il.com>, <minghsiu.tsai@...iatek.com>,
        <tiffany.lin@...iatek.com>, <jean-christophe.trotin@...com>,
        <horms+renesas@...ge.net.au>,
        <niklas.soderlund+renesas@...natech.se>, <robert.jarzmik@...e.fr>,
        <songjun.wu@...rochip.com>, <andrew-ct.chen@...iatek.com>,
        <gregkh@...uxfoundation.org>, <shuah@...nel.org>,
        <sakari.ailus@...ux.intel.com>, <pavel@....cz>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-media@...r.kernel.org>, <devel@...verdev.osuosl.org>
Subject: Re: [PATCH v5 00/39] i.MX Media Driver



On 03/18/2017 12:22 PM, Russell King - ARM Linux wrote:
> Hi Steve,
>
> I've just been trying to get gstreamer to capture and h264 encode
> video from my camera at various frame rates, and what I've discovered
> does not look good.
>
> 1) when setting frame rates, media-ctl _always_ calls
>     VIDIOC_SUBDEV_S_FRAME_INTERVAL with pad=0.
>
> 2) media-ctl never retrieves the frame interval information, so there's
>     no way to read it back with standard tools, and no indication that
>     this is going on...

I think Philipp Zabel submitted a patch which addresses these
in media-ctl. Check with him.

>
> 3) gstreamer v4l2src is getting upset, because it can't enumerate the
>     frame sizes (VIDIOC_ENUM_FRAMESIZES fails),

Right, imx-media-capture.c (the "standard" v4l2 user interface module)
is not implementing VIDIOC_ENUM_FRAMESIZES. It should, but it can only
return the single frame size that the pipeline has configured (the mbus
format of the attached source pad).

>   which causes it to
>     fallback to using the "tvnorms" to decide about frame rates.  This
>     makes it impossible to use frame rates higher than 30000/1001, and
>     causes the pipeline validation to fail.

In v5 I added validation of frame intervals between pads,
but due to negative feedback I've pulled that. So next
version will not attempt to validate frame intervals between
source->sink pads.

Can you share your gstreamer pipeline? For now, until
VIDIOC_ENUM_FRAMESIZES is implemented, try a pipeline that
does not attempt to specify a frame rate. I use the attached
script for testing, which works for me.



>
> 0:00:01.937465845 20954  0x15ffe90 DEBUG                   v4l2 gstv4l2object.c:2474:gst_v4l2_object_probe_caps_for_format:<v4l2src0> Enumerating frame sizes for RGGB
> 0:00:01.937588518 20954  0x15ffe90 DEBUG                   v4l2 gstv4l2object.c:2601:gst_v4l2_object_probe_caps_for_format:<v4l2src0> Failed to enumerate frame sizes for pixelformat RGGB (Inappropriate ioctl for device)
> 0:00:01.937879535 20954  0x15ffe90 LOG                     v4l2 gstv4l2object.c:2708:gst_v4l2_object_get_nearest_size:<v4l2src0> getting nearest size to 1x1 with format RGGB
> 0:00:01.937990874 20954  0x15ffe90 LOG                     v4l2 gstv4l2object.c:2724:gst_v4l2_object_get_nearest_size:<v4l2src0> got nearest size 816x616
> 0:00:01.938250889 20954  0x15ffe90 ERROR                   v4l2 gstv4l2object.c:1873:gst_v4l2_object_get_interlace_mode: Driver bug detected - check driver with v4l2-compliance from http://git.linuxtv.org/v4l-utils.git
> 0:00:01.938326893 20954  0x15ffe90 LOG                     v4l2 gstv4l2object.c:2708:gst_v4l2_object_get_nearest_size:<v4l2src0> getting nearest size to 32768x32768 with format RGGB
> 0:00:01.938431566 20954  0x15ffe90 LOG                     v4l2 gstv4l2object.c:2724:gst_v4l2_object_get_nearest_size:<v4l2src0> got nearest size 816x616
> 0:00:01.939776641 20954  0x15ffe90 ERROR                   v4l2 gstv4l2object.c:1873:gst_v4l2_object_get_interlace_mode: Driver bug detected - check driver with v4l2-compliance from http://git.linuxtv.org/v4l-utils.git
> 0:00:01.940110660 20954  0x15ffe90 DEBUG                   v4l2 gstv4l2object.c:1955:gst_v4l2_object_get_colorspace: Unknown enum v4l2_colorspace 0
>
>     This triggers the "/* Since we can't get framerate directly, try to
>     use the current norm */" code in v4l2object.c, which causes it to
>     select one of the 30000/1001 norms:
>
> 0:00:01.955927879 20954  0x15ffe90 INFO                    v4l2 gstv4l2object.c:3811:gst_v4l2_object_get_caps:<v4l2src0> probed caps: video/x-bayer, format=(string)rggb, framerate=(fraction)30000/1001, width=(int)816, height=(int)616, pixel-aspect-ratio=(fraction)1/1; video/x-raw, format=(string)I420, framerate=(fraction)30000/1001, width=(int)816, height=(int)616, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1; video/x-raw, format=(string)YV12, framerate=(fraction)30000/1001, width=(int)816, height=(int)616, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1; video/x-raw, format=(string)BGR, framerate=(fraction)30000/1001, width=(int)816, height=(int)616, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1; video/x-raw, format=(string)RGB, framerate=(fraction)30000/1001, width=(int)816, height=(int)616, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1
>
>     despite the media pipeline actually being configured for 60fps.
>
>     Forcing it by adjusting the pipeline only results in gstreamer
>     failing, because it believes that v4l2 is unable to operate at
>     60fps.
>
>     Also note the complaints from v4l2src about the non-compliance...

Thanks, I've fixed most of v4l2-compliance issues, but this is not
done yet. Is that something you can help with?

Steve


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