From 1c69184a9ad48d716469876cb6723d346396974b Mon Sep 17 00:00:00 2001
From: James Cameron <quozl@laptop.org>
Date: Wed, 07 Dec 2011 11:08:45 +0000
Subject: camera example, fix for delay in image capture file being ready

Sometimes the file that should be there, is not.  Waiting longer is
one workaround.  In this patch we wait until the file is available,
checking every second.

Tested by: Laurent Bernabe <laurent.bernabe@gmail.com>
---
(limited to 'data')

diff --git a/data/graphics/camera b/data/graphics/camera
index 2a37675..66d3d50 100644
--- a/data/graphics/camera
+++ b/data/graphics/camera
@@ -9,10 +9,6 @@ import time
 # grey background
 bgcolor = (128, 128, 128)
 
-# grab a frame from camera to file
-pipeline = gst.parse_launch('v4l2src ! ffmpegcolorspace ! jpegenc ! filesink location=/tmp/pippypic.jpg')
-pipeline.set_state(gst.STATE_PLAYING)
-
 # start using pygame
 pygame.init()
 
@@ -23,15 +19,22 @@ pygame.mouse.set_visible(False)
 # drawing in that window.
 screen = pygame.display.set_mode((0, 0), pygame.FULLSCREEN)
 
-# pause for a second to allow the camera frame to be grabbed
-time.sleep(1)
+# grab a frame from camera to file
+pipeline = gst.parse_launch('v4l2src ! ffmpegcolorspace ! jpegenc ! filesink location=/tmp/pippypic.jpg')
+pipeline.set_state(gst.STATE_PLAYING)
+
+# keep trying to load in the grabbed camera frame until it works
+while True:
+  try:
+    image = pygame.image.load('/tmp/pippypic.jpg')
+    break
+  except pygame.error:
+    time.sleep(1)
 
 # stop the camera frame grabbing
 pipeline.set_state(gst.STATE_NULL)
 
-# load in the grabbed camera frame
-image = pygame.image.load('/tmp/pippypic.jpg')
-
+# set initial rotation angle and scale
 angle = 0.0
 scale = 2.0
 
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