From: Hans Verkuil <hverkuil-cisco@xs4all.nl>
To: Ricardo Ribalda <ribalda@chromium.org>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
tfiga@chromium.org
Subject: Re: [PATCH v5 09/13] media: uvcvideo: Increase the size of UVC_METADATA_BUF_SIZE
Date: Wed, 17 Mar 2021 12:01:39 +0100 [thread overview]
Message-ID: <944ff35a-799d-63f4-46f3-458d69863830@xs4all.nl> (raw)
In-Reply-To: <20210316180004.1605727-10-ribalda@chromium.org>
On 16/03/2021 18:59, Ricardo Ribalda wrote:
> Hans has discovered that in his test device, for the H264 format
> bytesused goes up to about 570, for YUYV it will actually go up
> to a bit over 5000 bytes, and for MJPG up to about 2706 bytes.
>
> We should also, according to V4L2_META_FMT_UVC docs, drop headers when
> the buffer is full.
>
> Credit-to: Hans Verkuil <hverkuil@xs4all.nl>
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> ---
> drivers/media/usb/uvc/uvc_video.c | 8 +++++---
> drivers/media/usb/uvc/uvcvideo.h | 2 +-
> 2 files changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
> index 25fd8aa23529..ea2903dc3252 100644
> --- a/drivers/media/usb/uvc/uvc_video.c
> +++ b/drivers/media/usb/uvc/uvc_video.c
> @@ -1244,11 +1244,13 @@ static void uvc_video_decode_meta(struct uvc_streaming *stream,
> if (!meta_buf || length == 2)
> return;
>
> + /*
> + * According to V4L2_META_FMT_UVC docs, we should drop headers when
> + * the buffer is full.
> + */
> if (meta_buf->length - meta_buf->bytesused <
> - length + sizeof(meta->ns) + sizeof(meta->sof)) {
> - meta_buf->error = 1;
> + length + sizeof(meta->ns) + sizeof(meta->sof))
> return;
> - }
>
> has_pts = mem[1] & UVC_STREAM_PTS;
> has_scr = mem[1] & UVC_STREAM_SCR;
> diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
> index b81d3f65e52e..a26bbec8d37b 100644
> --- a/drivers/media/usb/uvc/uvcvideo.h
> +++ b/drivers/media/usb/uvc/uvcvideo.h
> @@ -527,7 +527,7 @@ struct uvc_stats_stream {
> unsigned int max_sof; /* Maximum STC.SOF value */
> };
>
> -#define UVC_METADATA_BUF_SIZE 1024
> +#define UVC_METADATA_BUF_SIZE 10240
>
> /**
> * struct uvc_copy_op: Context structure to schedule asynchronous memcpy
>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Thanks!
Hans
next prev parent reply other threads:[~2021-03-17 11:02 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-16 17:59 [PATCH v5 00/13] uvcvideo: Fix v4l2-compliance errors Ricardo Ribalda
2021-03-16 17:59 ` [PATCH v5 01/13] media: v4l2-ioctl: Fix check_ext_ctrls Ricardo Ribalda
2021-03-17 10:36 ` Hans Verkuil
2021-03-16 17:59 ` [PATCH v5 02/13] media: uvcvideo: Set capability in s_param Ricardo Ribalda
2021-03-16 17:59 ` [PATCH v5 03/13] media: uvcvideo: Return -EIO for control errors Ricardo Ribalda
2021-03-16 17:59 ` [PATCH v5 04/13] media: uvcvideo: Check controls flags before accessing them Ricardo Ribalda
2021-03-17 10:50 ` Hans Verkuil
2021-03-16 17:59 ` [PATCH v5 05/13] media: uvcvideo: refactor __uvc_ctrl_add_mapping Ricardo Ribalda
2021-03-16 17:59 ` [PATCH v5 06/13] media: uvcvideo: Add support for V4L2_CTRL_TYPE_CTRL_CLASS Ricardo Ribalda
2021-03-16 17:59 ` [PATCH v5 07/13] media: uvcvideo: Use dev->name for querycap() Ricardo Ribalda
2021-03-17 10:57 ` Hans Verkuil
2021-03-16 17:59 ` [PATCH v5 08/13] media: uvcvideo: Set unique vdev name based in type Ricardo Ribalda
2021-03-16 17:59 ` [PATCH v5 09/13] media: uvcvideo: Increase the size of UVC_METADATA_BUF_SIZE Ricardo Ribalda
2021-03-17 11:01 ` Hans Verkuil [this message]
2021-03-16 18:00 ` [PATCH v5 10/13] media: uvcvideo: Return -EACCES to inactive controls Ricardo Ribalda
2021-03-17 11:26 ` Hans Verkuil
2021-03-16 18:00 ` [PATCH v5 11/13] media: uvcvideo: Use control names from framework Ricardo Ribalda
2021-03-17 11:29 ` Hans Verkuil
2021-03-16 18:00 ` [PATCH v5 12/13] media: v4l2-ioctl: Set error_idx to the right value Ricardo Ribalda
2021-03-17 11:39 ` Hans Verkuil
2021-03-16 18:00 ` [PATCH v5 13/13] uvc: use vb2 ioctl and fop helpers Ricardo Ribalda
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