From: "Jernej Škrabec" <jernej.skrabec@siol.net>
To: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: devel@driverdev.osuosl.org, linux-media@vger.kernel.org,
pawel@osciak.com, jonas@kwiboo.se, gregkh@linuxfoundation.org,
wens@csie.org, mripard@kernel.org, tfiga@chromium.org,
paul.kocialkowski@bootlin.com, kyungmin.park@samsung.com,
boris.brezillon@collabora.com,
linux-arm-kernel@lists.infradead.org, mchehab@kernel.org,
ezequiel@collabora.com, linux-kernel@vger.kernel.org,
m.szyprowski@samsung.com
Subject: Re: [PATCH v2 0/6] media: cedrus: h264: Support multi-slice frames
Date: Tue, 01 Oct 2019 00:27:32 +0200 [thread overview]
Message-ID: <4342181.Ehiz7mZe5m@jernej-laptop> (raw)
In-Reply-To: <9ec1c07e-b0e8-f50c-7f46-df7ca303a5bc@xs4all.nl>
Dne ponedeljek, 30. september 2019 ob 10:10:48 CEST je Hans Verkuil
napisal(a):
> On 9/29/19 10:00 PM, Jernej Skrabec wrote:
> > This series adds support for decoding multi-slice H264 frames along with
> > support for V4L2_DEC_CMD_FLUSH and V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF.
> >
> > Code was tested by modified ffmpeg, which can be found here:
> > https://github.com/jernejsk/FFmpeg, branch mainline-test
> > It has to be configured with at least following options:
> > --enable-v4l2-request --enable-libudev --enable-libdrm
> >
> > Samples used for testing:
> > http://jernej.libreelec.tv/videos/h264/BA1_FT_C.mp4
> > http://jernej.libreelec.tv/videos/h264/h264.mp4
> >
> > Command line used for testing:
> > ffmpeg -hwaccel drm -hwaccel_device /dev/dri/card0 -i h264.mp4 -pix_fmt
> > bgra -f fbdev /dev/fb0
> >
> > Please note that V4L2_DEC_CMD_FLUSH was not tested because I'm
> > not sure how. ffmpeg follows exactly which slice is last in frame
> > and sets hold flag accordingly. Improper usage of hold flag would
> > corrupt ffmpeg assumptions and it would probably crash. Any ideas
> > how to test this are welcome!
>
> It can be tested partially at least: if ffmpeg tells you it is the last
> slice, then queue the slice with the HOLD flag set, then call FLUSH
> afterwards. This should clear the HOLD flag again. In this case the queued
> buffer is probably not yet processed, so the flag is cleared before the
> decode job starts.
>
> You can also try to add a sleep before calling FLUSH to see what happens
> if the last queued buffer is already decoded.
Ok, I tried following code:
https://github.com/jernejsk/FFmpeg/blob/flush_test/libavcodec/
v4l2_request.c#L220-L233
But results are not good. It seems that out_vb in flush command is always NULL
and so it always marks capture buffer as done, which leads to kernel warnings.
dmesg output with debugging messages is here: http://ix.io/1Ks8
Currently I'm not sure what is going on. Shouldn't be output buffer queued and
waiting to MEDIA_REQUEST_IOC_QUEUE which is executed after flush command as it
can be seen from ffmpeg code linked above?
Best regards,
Jernej
>
> Regards,
>
> Hans
>
> > Thanks to Jonas for adjusting ffmpeg.
> >
> > Please let me know what you think.
> >
> > Best regards,
> > Jernej
> >
> > Changes from v1:
> > - added Rb tags
> > - updated V4L2_DEC_CMD_FLUSH documentation
> > - updated first slice detection in Cedrus
> > - hold capture buffer flag is set according to source format
> > - added v4l m2m stateless_(try_)decoder_cmd ioctl helpers
> >
> > Hans Verkuil (2):
> > vb2: add V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF
> > videodev2.h: add V4L2_DEC_CMD_FLUSH
> >
> > Jernej Skrabec (4):
> > media: v4l2-mem2mem: add stateless_(try_)decoder_cmd ioctl helpers
> > media: cedrus: Detect first slice of a frame
> > media: cedrus: h264: Support multiple slices per frame
> > media: cedrus: Add support for holding capture buffer
> >
> > Documentation/media/uapi/v4l/buffer.rst | 13 ++++++
> > .../media/uapi/v4l/vidioc-decoder-cmd.rst | 10 +++-
> > .../media/uapi/v4l/vidioc-reqbufs.rst | 6 +++
> > .../media/videodev2.h.rst.exceptions | 1 +
> > .../media/common/videobuf2/videobuf2-v4l2.c | 8 +++-
> > drivers/media/v4l2-core/v4l2-mem2mem.c | 35 ++++++++++++++
> > drivers/staging/media/sunxi/cedrus/cedrus.h | 1 +
> > .../staging/media/sunxi/cedrus/cedrus_dec.c | 11 +++++
> > .../staging/media/sunxi/cedrus/cedrus_h264.c | 11 ++++-
> > .../staging/media/sunxi/cedrus/cedrus_hw.c | 8 ++--
> > .../staging/media/sunxi/cedrus/cedrus_video.c | 14 ++++++
> > include/media/v4l2-mem2mem.h | 46 +++++++++++++++++++
> > include/media/videobuf2-core.h | 3 ++
> > include/media/videobuf2-v4l2.h | 5 ++
> > include/uapi/linux/videodev2.h | 14 ++++--
> > 15 files changed, 175 insertions(+), 11 deletions(-)
_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
next prev parent reply other threads:[~2019-09-30 22:27 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-29 20:00 [PATCH v2 0/6] media: cedrus: h264: Support multi-slice frames Jernej Skrabec
2019-09-29 20:00 ` [PATCH v2 1/6] vb2: add V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF Jernej Skrabec
2019-09-29 20:00 ` [PATCH v2 2/6] videodev2.h: add V4L2_DEC_CMD_FLUSH Jernej Skrabec
2019-09-29 20:00 ` [PATCH v2 3/6] media: v4l2-mem2mem: add stateless_(try_)decoder_cmd ioctl helpers Jernej Skrabec
2019-10-04 9:21 ` Hans Verkuil
2019-10-07 6:02 ` Jernej Škrabec
2019-10-07 8:32 ` Hans Verkuil
2019-10-07 9:44 ` Hans Verkuil
2019-09-29 20:00 ` [PATCH v2 4/6] media: cedrus: Detect first slice of a frame Jernej Skrabec
2019-09-29 20:00 ` [PATCH v2 5/6] media: cedrus: h264: Support multiple slices per frame Jernej Skrabec
2019-09-29 20:00 ` [PATCH v2 6/6] media: cedrus: Add support for holding capture buffer Jernej Skrabec
2019-09-30 8:14 ` Hans Verkuil
2019-09-30 16:44 ` Jernej Škrabec
2019-09-30 8:10 ` [PATCH v2 0/6] media: cedrus: h264: Support multi-slice frames Hans Verkuil
2019-09-30 22:27 ` Jernej Škrabec [this message]
2019-09-30 22:43 ` Hans Verkuil
2019-09-30 22:58 ` Jernej Škrabec
2019-10-01 5:33 ` Jernej Škrabec
2019-10-07 10:44 ` Hans Verkuil
2019-10-07 19:01 ` Jernej Škrabec
2019-10-09 10:18 ` Hans Verkuil
2019-10-09 14:44 ` Jernej Škrabec
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4342181.Ehiz7mZe5m@jernej-laptop \
--to=jernej.skrabec@siol.net \
--cc=boris.brezillon@collabora.com \
--cc=devel@driverdev.osuosl.org \
--cc=ezequiel@collabora.com \
--cc=gregkh@linuxfoundation.org \
--cc=hverkuil-cisco@xs4all.nl \
--cc=jonas@kwiboo.se \
--cc=kyungmin.park@samsung.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-media@vger.kernel.org \
--cc=m.szyprowski@samsung.com \
--cc=mchehab@kernel.org \
--cc=mripard@kernel.org \
--cc=paul.kocialkowski@bootlin.com \
--cc=pawel@osciak.com \
--cc=tfiga@chromium.org \
--cc=wens@csie.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).