Implement Stream-Blanker

5 files changed, 159 insertions, 2 deletions

diff --git a/voctocore/lib/audiomix.py b/voctocore/lib/audiomix.py
index c37d215..294155b 100644
--- a/voctocore/lib/audiomix.py
+++ b/voctocore/lib/audiomix.py
@@ -31,6 +31,11 @@ class AudioMix(object):
 				tee. ! queue ! interaudiosink channel=audio_mix_preview
 			"""
 
+		if Config.getboolean('stream-blanker', 'enabled'):
+			pipeline += """
+				tee. ! queue ! interaudiosink channel=audio_mix_streamblanker
+			"""
+
 		for idx, name in enumerate(self.names):
 			pipeline += """
 				interaudiosrc channel=audio_{name}_mixer !
diff --git a/voctocore/lib/commands.py b/voctocore/lib/commands.py
index c16358b..f0b8011 100644
--- a/voctocore/lib/commands.py
+++ b/voctocore/lib/commands.py
@@ -10,6 +10,7 @@ class ControlServerCommands():
 
 		self.pipeline = pipeline
 		self.sources = Config.getlist('mix', 'sources')
+		self.blankersources = Config.getlist('stream-blanker', 'sources')
 
 	def decodeSourceName(self, src_name_or_id):
 		if isinstance(src_name_or_id, str):
@@ -21,6 +22,16 @@ class ControlServerCommands():
 		if src_name_or_id < 0 or src_name_or_id >= len(self.sources):
 			raise IndexError("source %s unknown" % src_name_or_id)
 
+	def decodeBlankerSourceName(self, src_name_or_id):
+		if isinstance(src_name_or_id, str):
+			try:
+				return self.blankersources.index(src_name_or_id)
+			except Exception as e:
+				raise IndexError("source %s unknown" % src_name_or_id)
+
+		if src_name_or_id < 0 or src_name_or_id >= len(self.blankersources):
+			raise IndexError("source %s unknown" % src_name_or_id)
+
 
 	def message(self, *args):
 		return True
@@ -48,3 +59,12 @@ class ControlServerCommands():
 
 		self.pipeline.vmix.setCompositeMode(mode)
 		return True
+
+	def set_stream_blank(self, src_name_or_id):
+		src_id = self.decodeBlankerSourceName(src_name_or_id)
+		self.pipeline.streamblanker.setBlankSource(src_id)
+		return True
+
+	def set_stream_live(self):
+		self.pipeline.streamblanker.setBlankSource(None)
+		return True
diff --git a/voctocore/lib/pipeline.py b/voctocore/lib/pipeline.py
index 1004b0e..f341491 100644
--- a/voctocore/lib/pipeline.py
+++ b/voctocore/lib/pipeline.py
@@ -11,6 +11,7 @@ from lib.avrawoutput import AVRawOutput
 from lib.avpreviewoutput import AVPreviewOutput
 from lib.videomix import VideoMix
 from lib.audiomix import AudioMix
+from lib.streamblanker import StreamBlanker
 
 class Pipeline(object):
 	"""mixing, streaming and encoding pipeline constuction and control"""
@@ -27,6 +28,7 @@ class Pipeline(object):
 		self.sources = []
 		self.mirrors = []
 		self.previews = []
+		self.sbsources = []
 
 		self.log.info('Creating %u Creating AVSources: %s', len(names), names)
 		for idx, name in enumerate(names):
@@ -59,16 +61,41 @@ class Pipeline(object):
 		self.amix = AudioMix()
 
 		port = 16000
-		self.log.info('Videomixer Background-Source-Port at tcp-port %u', port)
+		self.log.info('Creating Mixer-Background VSource at tcp-port %u', port)
 		self.bgsrc = VSource('background', port)
 
-
 		port = 11000
 		self.log.info('Creating Mixer-Output at tcp-port %u', port)
 		self.mixout = AVRawOutput('mix_out', port)
 
+
 		if Config.getboolean('previews', 'enabled'):
 			port = 12000
 			self.log.info('Creating Preview-Output for AVSource %s at tcp-port %u', name, port)
 
 			self.mixpreview = AVPreviewOutput('mix_preview', port)
+
+		if Config.getboolean('stream-blanker', 'enabled'):
+			names = Config.getlist('stream-blanker', 'sources')
+			if len(names) < 1:
+				raise RuntimeException("At least one StreamBlanker-Source must be configured or the StreamBlanker disabled!")
+			for idx, name in enumerate(names):
+				port = 17000 + idx
+				self.log.info('Creating StreamBlanker VSource %s at tcp-port %u', name, port)
+
+				source = VSource('%s_streamblanker' % name, port)
+				self.sbsources.append(source)
+
+			port = 18000
+			self.log.info('Creating StreamBlanker ASource at tcp-port %u', port)
+
+			source = ASource('streamblanker', port)
+			self.sbsources.append(source)
+
+
+		self.log.info('Creating StreamBlanker')
+		self.streamblanker = StreamBlanker()
+
+		port = 15000
+		self.log.info('Creating StreamBlanker-Output at tcp-port %u', port)
+		self.streamout = AVRawOutput('streamblanker_out', port)
diff --git a/voctocore/lib/streamblanker.py b/voctocore/lib/streamblanker.py
new file mode 100644
index 0000000..2f4cc58
--- /dev/null
+++ b/voctocore/lib/streamblanker.py
@@ -0,0 +1,100 @@
+#!/usr/bin/python3
+import logging
+from gi.repository import Gst
+from enum import Enum
+
+from lib.config import Config
+
+class StreamBlanker(object):
+	log = logging.getLogger('StreamBlanker')
+
+	def __init__(self):
+		self.acaps = Config.get('mix', 'audiocaps')
+		self.vcaps = Config.get('mix', 'videocaps')
+
+		self.names = Config.getlist('stream-blanker', 'sources')
+		self.log.info('Configuring StreamBlanker video %u Sources', len(self.names))
+
+		pipeline = """
+			compositor name=vmix !
+			{vcaps} !
+			intervideosink channel=video_streamblanker_out
+
+			audiomixer name=amix !
+			{acaps} !
+			interaudiosink channel=audio_streamblanker_out
+
+
+			intervideosrc channel=video_mix_streamblanker !
+			{vcaps} !
+			vmix.
+
+			interaudiosrc channel=audio_mix_streamblanker !
+			{acaps} !
+			amix.
+
+
+			interaudiosrc channel=audio_streamblanker !
+			{acaps} !
+			amix.
+		""".format(
+			acaps=self.acaps,
+			vcaps=self.vcaps
+		)
+
+		for name in self.names:
+			pipeline += """
+				intervideosrc channel=video_{name}_streamblanker !
+				{vcaps} !
+				vmix.
+			""".format(
+				name=name,
+				vcaps=self.vcaps
+			)
+
+		self.log.debug('Creating Mixing-Pipeline:\n%s', pipeline)
+		self.mixingPipeline = Gst.parse_launch(pipeline)
+
+		self.log.debug('Binding Error & End-of-Stream-Signal on Mixing-Pipeline')
+		self.mixingPipeline.bus.add_signal_watch()
+		self.mixingPipeline.bus.connect("message::eos", self.on_eos)
+		self.mixingPipeline.bus.connect("message::error", self.on_error)
+
+		self.log.debug('Initializing Mixer-State')
+		self.blankSource = None
+		self.applyMixerState()
+
+		self.log.debug('Launching Mixing-Pipeline')
+		self.mixingPipeline.set_state(Gst.State.PLAYING)
+
+	def on_eos(self, bus, message):
+		self.log.debug('Received End-of-Stream-Signal on Mixing-Pipeline')
+
+	def on_error(self, bus, message):
+		self.log.debug('Received Error-Signal on Mixing-Pipeline')
+		(error, debug) = message.parse_error()
+		self.log.debug('Error-Details: #%u: %s', error.code, debug)
+
+
+	def applyMixerState(self):
+		self.applyMixerStateAudio()
+		self.applyMixerStateVideo()
+
+	def applyMixerStateAudio(self):
+		mixpad = self.mixingPipeline.get_by_name('amix').get_static_pad('sink_0')
+		blankpad = self.mixingPipeline.get_by_name('amix').get_static_pad('sink_1')
+
+		mixpad.set_property('volume', int(self.blankSource is None))
+		blankpad.set_property('volume', int(self.blankSource is not None))
+
+	def applyMixerStateVideo(self):
+		mixpad = self.mixingPipeline.get_by_name('vmix').get_static_pad('sink_0')
+		mixpad.set_property('alpha', int(self.blankSource is None))
+
+		for idx, name in enumerate(self.names):
+			blankpad = self.mixingPipeline.get_by_name('vmix').get_static_pad('sink_%u' % (idx+1))
+			blankpad.set_property('alpha', int(self.blankSource == idx))
+
+	def setBlankSource(self, source):
+		self.blankSource = source
+		self.applyMixerState()
diff --git a/voctocore/lib/videomix.py b/voctocore/lib/videomix.py
index 6784956..3964783 100644
--- a/voctocore/lib/videomix.py
+++ b/voctocore/lib/videomix.py
@@ -54,6 +54,11 @@ class VideoMix(object):
 				tee. ! queue ! intervideosink channel=video_mix_preview
 			"""
 
+		if Config.getboolean('stream-blanker', 'enabled'):
+			pipeline += """
+				tee. ! queue ! intervideosink channel=video_mix_streamblanker
+			"""
+
 		for idx, name in enumerate(self.names):
 			pipeline += """
 				intervideosrc channel=video_{name}_mixer !