Hi, All
I have a question about VIDIOC_S_FMT?
Gstreamer will ioctl(VIDIOC_STREAMINGOFF）， then ioctl(VIDIOC_S_FMT), then
ioctl(VIDIOC_STREAMINGON)
The newest's code have these patch:
diff --git a/drivers/media/video/uvc/uvc_v4l2.c
b/drivers/media/video/uvc/uvc_v4l2.c
index 507542d..f8b94d6 100644 (file)
--- a/drivers/media/video/uvc/uvc_v4l2.c
+++ b/drivers/media/video/uvc/uvc_v4l2.c
@@ -251,7 +251,7 @@ static int uvc_v4l2_set_format(struct uvc_video_device
*video,
if (fmt->type != video->streaming->type)
return -EINVAL;
- if (uvc_queue_streaming(&video->queue))
+ if (uvc_queue_allocated(&video->queue))
return -EBUSY;
ret = uvc_v4l2_try_format(video, fmt, &probe, &format, &frame);
And, I found after this patch ioctl(VIDIOC_S_FMT) will failed at
uvc_queue_allocated(it won't failed at uvc_queue_streaming).
So, Now Can Gstreamer set the format(use ioctl(VIDIOC_STREAMINGOFF）， then
ioctl(VIDIOC_S_FMT), then ioctl(VIDIOC_STREAMINGON)) after open the
device(doesn't close) ?
If not, How to implement this?
Thanks a lot!
---
Best regards
Bo Liu
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