On Tue, Oct 23, 2012 at 08:40:04AM +0200, Hans Verkuil wrote:
> On Mon October 22 2012 19:01:40 Kirill Smelkov wrote:
> > On Mon, Oct 22, 2012 at 04:16:14PM +0200, Hans Verkuil wrote:
> > > On Mon October 22 2012 15:54:44 Kirill Smelkov wrote:
> > > > I was testing my video-over-ethernet subsystem today, and vivi seemed to
> > > > be perfect video source for testing when one don't have lots of capture
> > > > boards and cameras. Only its framerate was hardcoded to NTSC's 30fps,
> > > > while in my country we usually use PAL (25 fps). That's why the patch.
> > > > Thanks.
> > >
> > > Rather than introducing a module option, it's much nicer if you can
> > > implement enum_frameintervals and g/s_parm. This can be made quite flexible
> > > allowing you to also support 50/59.94/60 fps.
> >
> > Thanks for feedback. I've reworked the patch for FPS to be set via
> > ->{g,s}_parm(), and yes now it is more flexble, because one can set
> > different FPS on different vivi devices. Only I don't know V4L2 ioctls
> > details well enough and various drivers do things differently. The patch
> > is below. Is it ok?
>
> Close, but it's not quite there.
>
> You should run the v4l2-compliance tool from the v4l-utils.git repository
> (take the master branch). That will report any errors in your implementation.
>
> In this case g/s_parm doesn't set readbuffers (set it to 1) and if timeperframe
> equals { 0, 0 }, then you should get a nominal framerate (let's stick to 29.97
> for that). I would set the nominal framerate whenever the denominator == 0.
>
> For vidioc_enum_frameintervals you need to check the IN fields and fill in the
> stepwise struct.
Thanks for pointers and info about v4l2-compliance handy-tool. I've
tried to correct all the issues you mentioned above and here is the
patch.
(Only requirement to set stepwise.step to 1.0 for
V4L2_FRMIVAL_TYPE_CONTINUOUS seems a bit illogical to me, but anyway,
that's what the V4L2 spec requires...)
Thanks,
Kirill
---- 8< ----
From: Kirill Smelkov <kirr@xxxxxxxxxx>
Date: Tue, 23 Oct 2012 16:56:59 +0400
Subject: [PATCH v3] [media] vivi: Teach it to tune FPS
I was testing my video-over-ethernet subsystem yesterday, and vivi
seemed to be perfect video source for testing when one don't have lots
of capture boards and cameras. Only its framerate was hardcoded to
NTSC's 30fps, while in my country we usually use PAL (25 fps) and I
needed that to precisely simulate bandwidth.
That's why here is this patch with ->enum_frameintervals() and
->{g,s}_parm() implemented as suggested by Hans Verkuil which passes
v4l2-compliance and manual testing through v4l2-ctl -P / -p <fps>.
Regarding newly introduced __get_format(u32 pixelformat) I decided not
to convert original get_format() to operate on fourcc codes, since >= 3
places in driver need to deal with v4l2_format and otherwise it won't be
handy.
Thanks.
Signed-off-by: Kirill Smelkov <kirr@xxxxxxxxxx>
---
drivers/media/platform/vivi.c | 84 ++++++++++++++++++++++++++++++++++++++-----
1 file changed, 75 insertions(+), 9 deletions(-)
V3:
- corrected issues with V4L2 spec compliance as pointed by Hans
Verkuil.
V2:
- reworked FPS setting from module param to via ->{g,s}_parm() as suggested
by Hans Verkuil.
diff --git a/drivers/media/platform/vivi.c b/drivers/media/platform/vivi.c
index 3e6902a..3adea58 100644
--- a/drivers/media/platform/vivi.c
+++ b/drivers/media/platform/vivi.c
@@ -36,10 +36,6 @@
#define VIVI_MODULE_NAME "vivi"
-/* Wake up at about 30 fps */
-#define WAKE_NUMERATOR 30
-#define WAKE_DENOMINATOR 1001
-
#define MAX_WIDTH 1920
#define MAX_HEIGHT 1200
@@ -69,6 +65,9 @@ MODULE_PARM_DESC(vid_limit, "capture memory limit in megabytes");
/* Global font descriptor */
static const u8 *font8x16;
+/* default to NTSC timeperframe */
+static const struct v4l2_fract TPF_DEFAULT = {.numerator = 1001, .denominator = 30000};
+
#define dprintk(dev, level, fmt, arg...) \
v4l2_dbg(level, debug, &dev->v4l2_dev, fmt, ## arg)
@@ -150,14 +149,14 @@ static struct vivi_fmt formats[] = {
},
};
-static struct vivi_fmt *get_format(struct v4l2_format *f)
+static struct vivi_fmt *__get_format(u32 pixelformat)
{
struct vivi_fmt *fmt;
unsigned int k;
for (k = 0; k < ARRAY_SIZE(formats); k++) {
fmt = &formats[k];
- if (fmt->fourcc == f->fmt.pix.pixelformat)
+ if (fmt->fourcc == pixelformat)
break;
}
@@ -167,6 +166,11 @@ static struct vivi_fmt *get_format(struct v4l2_format *f)
return &formats[k];
}
+static struct vivi_fmt *get_format(struct v4l2_format *f)
+{
+ return __get_format(f->fmt.pix.pixelformat);
+}
+
/* buffer for one video frame */
struct vivi_buffer {
/* common v4l buffer stuff -- must be first */
@@ -232,6 +236,7 @@ struct vivi_dev {
/* video capture */
struct vivi_fmt *fmt;
+ struct v4l2_fract timeperframe;
unsigned int width, height;
struct vb2_queue vb_vidq;
unsigned int field_count;
@@ -660,8 +665,8 @@ static void vivi_thread_tick(struct vivi_dev *dev)
dprintk(dev, 2, "[%p/%d] done\n", buf, buf->vb.v4l2_buf.index);
}
-#define frames_to_ms(frames) \
- ((frames * WAKE_NUMERATOR * 1000) / WAKE_DENOMINATOR)
+#define frames_to_ms(dev, frames) \
+ ((frames * dev->timeperframe.numerator * 1000) / dev->timeperframe.denominator)
static void vivi_sleep(struct vivi_dev *dev)
{
@@ -677,7 +682,7 @@ static void vivi_sleep(struct vivi_dev *dev)
goto stop_task;
/* Calculate time to wake up */
- timeout = msecs_to_jiffies(frames_to_ms(1));
+ timeout = msecs_to_jiffies(frames_to_ms(dev, 1));
vivi_thread_tick(dev);
@@ -1049,6 +1054,63 @@ static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
return 0;
}
+/* timeperframe is arbitrary and continous */
+static int vidioc_enum_frameintervals(struct file *file, void *priv,
+ struct v4l2_frmivalenum *fival)
+{
+ struct vivi_fmt *fmt;
+
+ if (fival->index)
+ return -EINVAL;
+
+ fmt = __get_format(fival->pixel_format);
+ if (!fmt)
+ return -EINVAL;
+
+ /* regarding width width & height - we support any */
+
+ fival->type = V4L2_FRMIVAL_TYPE_CONTINUOUS;
+
+ /* fill in stepwise as required by V4L2 spec, i.e.
+ *
+ * min <= (step = 1.0) <= max
+ */
+ fival->stepwise.step = (struct v4l2_fract) {1, 1};
+ fival->stepwise.min = (struct v4l2_fract) {1, 1};
+ fival->stepwise.max = (struct v4l2_fract) {2, 1};
+
+ return 0;
+}
+
+static int vidioc_g_parm(struct file *file, void *priv, struct v4l2_streamparm *parm)
+{
+ struct vivi_dev *dev = video_drvdata(file);
+
+ if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ return -EINVAL;
+
+ parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
+ parm->parm.capture.timeperframe = dev->timeperframe;
+ parm->parm.capture.readbuffers = 1;
+ return 0;
+}
+
+static int vidioc_s_parm(struct file *file, void *priv, struct v4l2_streamparm *parm)
+{
+ struct vivi_dev *dev = video_drvdata(file);
+
+ if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ return -EINVAL;
+
+ dev->timeperframe = parm->parm.capture.timeperframe.denominator ?
+ parm->parm.capture.timeperframe :
+ TPF_DEFAULT; /* {*, 0} resets timing */
+
+ parm->parm.capture.timeperframe = dev->timeperframe;
+ parm->parm.capture.readbuffers = 1;
+ return 0;
+}
+
/* --- controls ---------------------------------------------- */
static int vivi_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
@@ -1207,6 +1269,9 @@ static const struct v4l2_ioctl_ops vivi_ioctl_ops = {
.vidioc_enum_input = vidioc_enum_input,
.vidioc_g_input = vidioc_g_input,
.vidioc_s_input = vidioc_s_input,
+ .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
+ .vidioc_g_parm = vidioc_g_parm,
+ .vidioc_s_parm = vidioc_s_parm,
.vidioc_streamon = vb2_ioctl_streamon,
.vidioc_streamoff = vb2_ioctl_streamoff,
.vidioc_log_status = v4l2_ctrl_log_status,
@@ -1265,6 +1330,7 @@ static int __init vivi_create_instance(int inst)
goto free_dev;
dev->fmt = &formats[0];
+ dev->timeperframe = TPF_DEFAULT;
dev->width = 640;
dev->height = 480;
dev->pixelsize = dev->fmt->depth / 8;
--
1.8.0.rc3.331.g5b9a629
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