From d774a6723a8830ae12ff3892ba5894b25cfabe63 Mon Sep 17 00:00:00 2001
From: Calin Crisan <ccrisan@gmail.com>
Date: Sun, 13 Oct 2013 11:54:57 +0300
Subject: [PATCH] added getters for v4l2 controls

---
 doc/todo.txt    |  3 +++
 src/config.py   | 12 ++++++------
 src/handlers.py | 14 ++++++++++++++
 src/v4l2ctl.py  | 44 ++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 67 insertions(+), 6 deletions(-)

diff --git a/doc/todo.txt b/doc/todo.txt
index 8b72347..50b7e7a 100644
--- a/doc/todo.txt
+++ b/doc/todo.txt
@@ -1,3 +1,6 @@
+-> default sat/contrast/hue... for existing conf file is somehow 0
+-> request closed while setting the preview params
+-> applying progress sometimes does not appear on frame
 
 -> style scroll bars
 -> hint text next to section titles
diff --git a/src/config.py b/src/config.py
index fab798c..e558630 100644
--- a/src/config.py
+++ b/src/config.py
@@ -522,16 +522,16 @@ def _set_default_motion(data):
 
 
 def _set_default_motion_camera(data):
-    data.setdefault('@name', '')
+    data.setdefault('@name', 'My Camera')
     data.setdefault('@enabled', False)
     data.setdefault('@proto', 'v4l2')
-    data.setdefault('videodevice', '')
+    data.setdefault('videodevice', '/dev/video0')
     data.setdefault('lightswitch', 0)
     data.setdefault('auto_brightness', True)
-    data.setdefault('brightness', 127)
-    data.setdefault('contrast', 127)
-    data.setdefault('saturation', 127)
-    data.setdefault('hue', 127)
+    data.setdefault('brightness', 0)
+    data.setdefault('contrast', 0)
+    data.setdefault('saturation', 0)
+    data.setdefault('hue', 0)
     data.setdefault('width', 352)
     data.setdefault('height', 288)
     data.setdefault('framerate', 5)
diff --git a/src/handlers.py b/src/handlers.py
index 6980c86..765607d 100644
--- a/src/handlers.py
+++ b/src/handlers.py
@@ -690,6 +690,20 @@ class ConfigHandler(BaseHandler):
             'sunday_from': '09:00', 'sunday_to': '17:00'
         }
         
+        # null values for brightness & co. mean current values
+        if ui['proto'] == 'v4l2':
+            if ui['brightness'] == 0:
+                ui['brightness'] = v4l2ctl.get_brightness(ui['device'])
+                
+            if ui['contrast'] == 0:
+                ui['contrast'] = v4l2ctl.get_contrast(ui['device'])
+                
+            if ui['saturation'] == 0:
+                ui['saturation'] = v4l2ctl.get_saturation(ui['device'])
+                
+            if ui['hue'] == 0:
+                ui['hue'] = v4l2ctl.get_hue(ui['device'])
+                
         text_left = data.get('text_left')
         text_right = data.get('text_right') 
         if text_left or text_right:
diff --git a/src/v4l2ctl.py b/src/v4l2ctl.py
index 52f4258..fa294da 100644
--- a/src/v4l2ctl.py
+++ b/src/v4l2ctl.py
@@ -50,22 +50,66 @@ def list_resolutions(device):
     return list(sorted(resolutions, key=lambda r: (r[0], r[1])))
 
 
+def get_brightness(device):
+    return _get_ctrl(device, 'brightness')
+
+
 def set_brightness(device, value):
     _set_ctrl(device, 'brightness', value)
 
 
+def get_contrast(device):
+    return _get_ctrl(device, 'contrast')
+
+
 def set_contrast(device, value):
     _set_ctrl(device, 'contrast', value)
 
 
+def get_saturation(device):
+    return _get_ctrl(device, 'saturation')
+
+
 def set_saturation(device, value):
     _set_ctrl(device, 'saturation', value)
 
 
+def get_hue(device):
+    return _get_ctrl(device, 'hue')
+
+
 def set_hue(device, value):
     _set_ctrl(device, 'hue', value)
 
 
+def _get_ctrl(device, control):
+    controls = _list_ctrls(device)
+    properties = controls.get(control)
+    if properties is None:
+        logging.warn('control %(control)s not found for device %(device)s' % {
+                'control': control, 'device': device})
+        
+        return None
+    
+    value = int(properties['value'])
+    
+    # adjust the value range
+    if 'min' in properties and 'max' in properties:
+        min_value = int(properties['min'])
+        max_value = int(properties['max'])
+        
+        value = int((value - min_value) * 100.0 / (max_value - min_value))
+    
+    else:
+        logging.warn('min and max values not found for control %(control)s of device %(device)s' % {
+                'control': control, 'device': device})
+    
+    logging.debug('control %(control)s of device %(device)s is %(value)s%%' % {
+            'control': control, 'device': device, 'value': value})
+    
+    return value
+
+
 def _set_ctrl(device, control, value):
     controls = _list_ctrls(device)
     properties = controls.get(control)
-- 
2.39.5