From: Joseph Coffland <joseph@cauldrondevelopment.com>
Date: Wed, 19 Sep 2018 11:35:12 +0000 (-0700)
Subject: Reduce video frame rate
X-Git-Url: https://git.buildbotics.com/?a=commitdiff_plain;h=0c31710639934e0d7691507853de5be90b3d001b;p=bbctrl-firmware

Reduce video frame rate
---

diff --git a/src/py/bbctrl/Camera.py b/src/py/bbctrl/Camera.py
index 5814927..881bfbf 100755
--- a/src/py/bbctrl/Camera.py
+++ b/src/py/bbctrl/Camera.py
@@ -307,6 +307,14 @@ class VideoDevice(object):
         return caps
 
 
+    def set_fps(self, fps):
+        setfps = v4l2.v4l2_streamparm()
+        setfps.type = v4l2.V4L2_BUF_TYPE_VIDEO_CAPTURE;
+        setfps.parm.capture.timeperframe.numerator = 1
+        setfps.parm.capture.timeperframe.denominator = fps
+        fcntl.ioctl(self, v4l2.VIDIOC_S_PARM, setfps)
+
+
     def start(self):
         buf_type = v4l2.v4l2_buf_type(v4l2.V4L2_BUF_TYPE_VIDEO_CAPTURE)
         fcntl.ioctl(self, v4l2.VIDIOC_STREAMON, buf_type)
@@ -368,6 +376,7 @@ class Camera(object):
                 raise Exception('Video capture not supported.')
 
             self.dev.set_format(640, 480, fourcc = v4l2.V4L2_PIX_FMT_MJPEG)
+            self.dev.set_fps(15)
             self.dev.create_buffers(30)
             self.dev.start()