Hi,
gspca does not implement vidioc_enum_frameintervals yet, so even if a
camera can support multiple frame rates (or frame intervals) there is
still no way to enumerate them from userspace.
The following is just a quick and dirty implementation to show the
problem and to have something to base the discussion on. In the patch
there is also a working example of use with the ov534 subdriver.
Someone with a better knowledge of gspca and v4l internals can suggest
better solutions.
The tests has been done using 'luvcview -L', the output before the
patch:
$ luvcview -d /dev/video1 -L
luvcview 0.2.6
SDL information:
Video driver: x11
A window manager is available
Device information:
Device path: /dev/video1
{ pixelformat = 'YUYV', description = 'YUYV' }
{ discrete: width = 320, height = 240 }
Time interval between frame:
1/40, 1/30, { discrete: width = 640, height = 480 }
Time interval between frame:
And the output after it:
$ luvcview -d /dev/video1 -L
luvcview 0.2.6
SDL information:
Video driver: x11
A window manager is available
Device information:
Device path: /dev/video1
{ pixelformat = 'YUYV', description = 'YUYV' }
{ discrete: width = 320, height = 240 }
Time interval between frame: 1/125, 1/100, 1/75, 1/60, 1/50, 1/40, 1/30,
{ discrete: width = 640, height = 480 }
Time interval between frame: 1/60, 1/50, 1/40, 1/30, 1/15,
Thanks,
Antonio
diff -r 182b5f8fa160 linux/drivers/media/video/gspca/gspca.c
--- a/linux/drivers/media/video/gspca/gspca.c Sun Nov 15 10:05:30 2009 +0100
+++ b/linux/drivers/media/video/gspca/gspca.c Tue Nov 17 11:39:21 2009 +0100
@@ -995,6 +995,37 @@
return -EINVAL;
}
+static int vidioc_enum_frameintervals(struct file *filp, void *priv,
+ struct v4l2_frmivalenum *fival)
+{
+ struct gspca_dev *gspca_dev = priv;
+ int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
+ int i;
+ __u32 index = 0;
+
+ if (gspca_dev->cam.mode_framerates == NULL ||
+ gspca_dev->cam.mode_framerates[mode].nrates == 0)
+ return -EINVAL;
+
+ /* FIXME: Needed? */
+ if (fival->pixel_format !=
+ gspca_dev->cam.cam_mode[mode].pixelformat)
+ return -EINVAL;
+
+ for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
+ if (fival->index == index) {
+ fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
+ fival->discrete.numerator = 1;
+ fival->discrete.denominator =
+ gspca_dev->cam.mode_framerates[mode].rates[i];
+ return 0;
+ }
+ index++;
+ }
+
+ return -EINVAL;
+}
+
static void gspca_release(struct video_device *vfd)
{
struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
@@ -1987,6 +2018,7 @@
.vidioc_g_parm = vidioc_g_parm,
.vidioc_s_parm = vidioc_s_parm,
.vidioc_enum_framesizes = vidioc_enum_framesizes,
+ .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
#ifdef CONFIG_VIDEO_ADV_DEBUG
.vidioc_g_register = vidioc_g_register,
.vidioc_s_register = vidioc_s_register,
diff -r 182b5f8fa160 linux/drivers/media/video/gspca/gspca.h
--- a/linux/drivers/media/video/gspca/gspca.h Sun Nov 15 10:05:30 2009 +0100
+++ b/linux/drivers/media/video/gspca/gspca.h Tue Nov 17 11:39:21 2009 +0100
@@ -45,11 +45,17 @@
/* image transfers */
#define MAX_NURBS 4 /* max number of URBs */
+struct framerates {
+ int *rates;
+ int nrates;
+};
+
/* device information - set at probe time */
struct cam {
int bulk_size; /* buffer size when image transfer by bulk */
const struct v4l2_pix_format *cam_mode; /* size nmodes */
char nmodes;
+ const struct framerates *mode_framerates; /* size nmode, like cam_mode */
__u8 bulk_nurbs; /* number of URBs in bulk mode
* - cannot be > MAX_NURBS
* - when 0 and bulk_size != 0 means
diff -r 182b5f8fa160 linux/drivers/media/video/gspca/ov534.c
--- a/linux/drivers/media/video/gspca/ov534.c Sun Nov 15 10:05:30 2009 +0100
+++ b/linux/drivers/media/video/gspca/ov534.c Tue Nov 17 11:39:21 2009 +0100
@@ -287,6 +287,20 @@
.priv = 0},
};
+static int qvga_rates[] = {125, 100, 75, 60, 50, 40, 30};
+static int vga_rates[] = {60, 50, 40, 30, 15};
+
+static const struct framerates ov772x_framerates[] = {
+ { /* 320x240 */
+ .rates = qvga_rates,
+ .nrates = ARRAY_SIZE(qvga_rates),
+ },
+ { /* 640x480 */
+ .rates = vga_rates,
+ .nrates = ARRAY_SIZE(vga_rates),
+ },
+};
+
static const struct v4l2_pix_format ov965x_mode[] = {
{320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
.bytesperline = 320,
@@ -1411,6 +1425,7 @@
if (sd->sensor == SENSOR_OV772X) {
cam->cam_mode = ov772x_mode;
cam->nmodes = ARRAY_SIZE(ov772x_mode);
+ cam->mode_framerates = ov772x_framerates;
cam->bulk = 1;
cam->bulk_size = 16384;
--
Antonio Ospite
http://ao2.it
PGP public key ID: 0x4553B001
A: Because it messes up the order in which people normally read text.
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