Re: [PATCH 1/1] gspca: Add high-speed modes for PS3 Eye camera

Hans de Goede <hdegoede@xxxxxxxxxx> · Thu, 15 Jan 2015 11:53:02 +0100

Hi,

On 04-01-15 16:29, Antonio Ospite wrote:
On Mon, 29 Dec 2014 11:00:03 -0400
Joe Howse <josephhowse@xxxxxxxxxxx> wrote:

Add support in the PS3 Eye driver for QVGA capture at higher
frame rates: 187, 150, and 137 FPS. This functionality is valuable
because the PS3 Eye is popular for computer vision projects and no
other camera in its price range supports such high frame rates.

Correct a QVGA mode that was listed as 40 FPS. It is really 37 FPS
(half of 75 FPS).

Tests confirm that the nominal frame rates are achieved.

Signed-off-by: Joe Howse <josephhowse@xxxxxxxxxxx>

Tested-by: Antonio Ospite <ao2@xxxxxx>

Joe, thanks for the patch, Antonio, thanks for testing, I've queued
this up in my gspca tree for merging into the 3.20 kernel

Regards,

Hans


Thanks Joe.

I noticed that qv4l2 displays max 60fps even though from the video I can
perceive the higher framerate, and same happens in guvcview.

gst-inspect-1.0 won't even let me set framerates higher than 75 so
I didn't test with GStreamer.

I know that the camera is also able to stream raw Bayer data which
requires less bandwidth than the default YUYV, although the driver does
not currently expose that; maybe some higher framerates can be achieved
also at VGA with Bayer output.

In case you wanted to explore that remember to set supported framerates
appropriately in ov772x_framerates for the 4 combinations of formats and
resolutions (i.e. Bayer outputs will support more framerates).

Ciao,
    Antonio

---
  drivers/media/usb/gspca/ov534.c | 10 ++++++++--
  1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/gspca/ov534.c b/drivers/media/usb/gspca/ov534.c
index 90f0d63..a9c866d 100644
--- a/drivers/media/usb/gspca/ov534.c
+++ b/drivers/media/usb/gspca/ov534.c
@@ -12,6 +12,8 @@
   * PS3 Eye camera enhanced by Richard Kaswy http://kaswy.free.fr
   * PS3 Eye camera - brightness, contrast, awb, agc, aec controls
   *                  added by Max Thrun <bear24rw@xxxxxxxxx>
+ * PS3 Eye camera - FPS range extended by Joseph Howse
+ *                  <josephhowse@xxxxxxxxxxx> http://nummist.com
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
@@ -116,7 +118,7 @@ static const struct v4l2_pix_format ov767x_mode[] = {
  		.colorspace = V4L2_COLORSPACE_JPEG},
  };

-static const u8 qvga_rates[] = {125, 100, 75, 60, 50, 40, 30};
+static const u8 qvga_rates[] = {187, 150, 137, 125, 100, 75, 60, 50, 37, 30};
  static const u8 vga_rates[] = {60, 50, 40, 30, 15};

  static const struct framerates ov772x_framerates[] = {
@@ -769,12 +771,16 @@ static void set_frame_rate(struct gspca_dev *gspca_dev)
  		{15, 0x03, 0x41, 0x04},
  	};
  	static const struct rate_s rate_1[] = {	/* 320x240 */
+/*		{205, 0x01, 0xc1, 0x02},  * 205 FPS: video is partly corrupt */
+		{187, 0x01, 0x81, 0x02}, /* 187 FPS or below: video is valid */
+		{150, 0x01, 0xc1, 0x04},
+		{137, 0x02, 0xc1, 0x02},
  		{125, 0x02, 0x81, 0x02},
  		{100, 0x02, 0xc1, 0x04},
  		{75, 0x03, 0xc1, 0x04},
  		{60, 0x04, 0xc1, 0x04},
  		{50, 0x02, 0x41, 0x04},
-		{40, 0x03, 0x41, 0x04},
+		{37, 0x03, 0x41, 0x04},
  		{30, 0x04, 0x41, 0x04},
  	};

--
1.9.1

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