On 08/19/2014 05:01 PM, Laurent Pinchart wrote:
> Hi Michael,
>
> Thank you for the patch.
>
> (CC'ing Hans Verkuil and the linux-media mailing list)
>
> On Friday 08 August 2014 17:38:58 Michael Grzeschik wrote:
>> This patch adds ENUM_FMT as possible ioctl to the uvc v4l2 device.
>> That makes userspace applications with a generic IOCTL calling
>> convention make also use of it.
>>
>> Signed-off-by: Michael Grzeschik <[email protected]>
>> ---
>> v1 -> v2:
>> - changed first switch case to simple if
>> - added separate function
>> - added description field
>> - bail out on array boundaries
>>
>> drivers/usb/gadget/uvc_v4l2.c | 30 ++++++++++++++++++++++++++++--
>> 1 file changed, 28 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/usb/gadget/uvc_v4l2.c b/drivers/usb/gadget/uvc_v4l2.c
>> index ad48e81..58633bf 100644
>> --- a/drivers/usb/gadget/uvc_v4l2.c
>> +++ b/drivers/usb/gadget/uvc_v4l2.c
>> @@ -55,14 +55,30 @@ struct uvc_format
>> {
>> u8 bpp;
>> u32 fcc;
>> + char *description;
>> };
>>
>> static struct uvc_format uvc_formats[] = {
>> - { 16, V4L2_PIX_FMT_YUYV },
>> - { 0, V4L2_PIX_FMT_MJPEG },
>> + { 16, V4L2_PIX_FMT_YUYV, "YUV 4:2:2" },
>> + { 0, V4L2_PIX_FMT_MJPEG, "MJPEG" },
>
> Format descriptions are currently duplicated in every driver, causing higher
> memory usage and different descriptions for the same format depending on the
> driver. Hans, should we try to fix this ?
Yes, we should. It's been on my todo list for ages, but at a very low priority.
I'm not planning to work on this in the near future, but if someone else wants
to work on this, then just go ahead.
Regards,
Hans
>
>> };
>>
>> static int
>> +uvc_v4l2_enum_format(struct uvc_video *video, struct v4l2_fmtdesc *fmt)
>> +{
>> +
>
> There's an extra blank line here.
>
>> + int index = fmt->index;
>
> You can use fmt->index directly below, there's no need for a local variable.
>
>> + if (index >= ARRAY_SIZE(uvc_formats))
>> + return -EINVAL;
>> +
>> + strcpy(fmt->description, uvc_formats[index].description);
>
> How about strlcpy to make sure we don't overflow the buffer ?
>
>> + fmt->pixelformat = uvc_formats[index].fcc;
>> +
>> + return 0;
>> +}
>> +
>> +static int
>> uvc_v4l2_get_format(struct uvc_video *video, struct v4l2_format *fmt)
>> {
>> fmt->fmt.pix.pixelformat = video->fcc;
>> @@ -183,6 +199,16 @@ uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd,
>> void *arg) break;
>> }
>>
>> + case VIDIOC_ENUM_FMT:
>> + {
>> + struct v4l2_fmtdesc *fmt = arg;
>> +
>> + if (fmt->type != video->queue.queue.type)
>> + return -EINVAL;
>> +
>> + return uvc_v4l2_enum_format(video, fmt);
>> + }
>> +
>> /* Get & Set format */
>> case VIDIOC_G_FMT:
>
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