implement side-by-side-equal composition

1 files changed, 88 insertions, 6 deletions

diff --git a/voctocore/lib/video/mix.py b/voctocore/lib/video/mix.py
index a9e1513..bcac7d2 100644
--- a/voctocore/lib/video/mix.py
+++ b/voctocore/lib/video/mix.py
@@ -5,8 +5,9 @@ from enum import Enum
 
 from lib.config import Config
 
-class ComposteModes(Enum):
+class CompositeModes(Enum):
 	fullscreen = 0
+	side_by_side_equal = 1
 
 class VideoMix(object):
 	log = logging.getLogger('VideoMix')
@@ -16,7 +17,7 @@ class VideoMix(object):
 	caps = None
 	names = []
 
-	compositeMode = ComposteModes.fullscreen
+	compositeMode = CompositeModes.fullscreen
 	sourceA = 0
 	sourceB = 1
 
@@ -58,15 +59,21 @@ class VideoMix(object):
 		self.mixingPipeline.set_state(Gst.State.PLAYING)
 
 	def updateMixerState(self):
-		if self.compositeMode == ComposteModes.fullscreen:
+		if self.compositeMode == CompositeModes.fullscreen:
 			self.updateMixerStateFullscreen()
 
+		if self.compositeMode == CompositeModes.side_by_side_equal:
+			self.updateMixerStateSideBySideEqual()
+
 	def updateMixerStateFullscreen(self):
 		self.log.info('Updating Mixer-State for Fullscreen-Composition')
+
+		noScaleCaps = Gst.Caps.from_string('video/x-raw')
+
 		for idx, name in enumerate(self.names):
 			alpha = int(idx == self.sourceA)
 
-			self.log.debug('Setting Mixerpad %u to x/y=0 and alpha=%u', idx, alpha)
+			self.log.debug('Setting Mixerpad %u to x/y=0 and alpha=%0.2f', idx, alpha)
 			mixerpad = self.mixingPipeline.get_by_name('mix').get_static_pad('sink_%u' % idx)
 			mixerpad.set_property('alpha', alpha )
 			mixerpad.set_property('xpos', 0)
@@ -74,12 +81,87 @@ class VideoMix(object):
 
 			self.log.debug('Resetting Scaler %u to non-scaling', idx)
 			capsfilter = self.mixingPipeline.get_by_name('caps_%u' % idx)
-			capsfilter.set_property('caps', Gst.Caps.from_string(self.caps))
+			capsfilter.set_property('caps', noScaleCaps)
+
+	def getInputVideoSize(self):
+		caps = Gst.Caps.from_string(self.caps)
+		struct = caps.get_structure(0)
+		_, width = struct.get_int('width')
+		_, height = struct.get_int('height')
+
+		return width, height
+
+	def updateMixerStateSideBySideEqual(self):
+		self.log.info('Updating Mixer-State for Side-by-side-Equal-Composition')
+
+		width, height = self.getInputVideoSize()
+		gutter = int(width / 100)
+
+		self.log.debug('Video-Size parsed as %u/%u, Gutter calculated to %upx', width, height, gutter)
+
+		targetWidth = int((width - gutter) / 2)
+		targetHeight = int(targetWidth / width * height)
+
+		ycenter = (height - targetHeight) / 2
+		xa = 0
+		xb = width - targetWidth
+
+		scaleCaps = Gst.Caps.from_string('video/x-raw,width=%u,height=%u' % (targetWidth, targetHeight))
+		noScaleCaps = Gst.Caps.from_string('video/x-raw')
+
+		for idx, name in enumerate(self.names):
+			mixerpad = self.mixingPipeline.get_by_name('mix').get_static_pad('sink_%u' % idx)
+
+			if idx == self.sourceA:
+				x = xa
+				y = ycenter
+				caps = scaleCaps
+				alpha = 1
+
+				self.log.debug('Setting Mixerpad %u to x/y=%u/%u and alpha=%0.2f', idx, x, y, alpha)
+				self.log.debug('Setting Scaler %u to %u/%u', idx, targetWidth, targetHeight)
+
+			elif idx == self.sourceB:
+				x = xb
+				y = ycenter
+				caps = scaleCaps
+				alpha = 1
+
+				self.log.debug('Setting Mixerpad %u to x/y=%u/%u and alpha=%0.2f', idx, x, y, alpha)
+				self.log.debug('Setting Scaler %u to %u/%u', idx, targetWidth, targetHeight)
+
+			else:
+				x = 0
+				y = 0
+				caps = noScaleCaps
+				alpha = 0
+
+				self.log.debug('Setting Mixerpad %u to x/y=%u/%u and alpha=%0.2f', idx, x, y, alpha)
+				self.log.debug('Resetting Scaler %u to non-scaling', idx)
+
+			mixerpad.set_property('alpha', alpha)
+			mixerpad.set_property('xpos', x)
+			mixerpad.set_property('ypos', y)
+
+			capsfilter = self.mixingPipeline.get_by_name('caps_%u' % idx)
+			capsfilter.set_property('caps', caps)
 
 	def setVideoA(self, source):
+		# swap if required
+		if self.sourceB == source:
+			self.sourceB = self.sourceA
+
 		self.sourceA = source
 		self.updateMixerState()
 
 	def setVideoB(self, source):
-		self.sourceN = source
+		# swap if required
+		if self.sourceA == source:
+			self.sourceA = self.sourceB
+
+		self.sourceB = source
+		self.updateMixerState()
+
+	def setCompositeMode(self, mode):
+		self.compositeMode = mode
 		self.updateMixerState()