import threading
import queue
import socket
import subprocess

threads = {}
threadId = 0
threadsLock = threading.Lock()

serverAddr = ("127.0.0.1",12000)
serverSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
serverSocket.bind(serverAddr)
serverSocket.listen(1024)

bufferSize = 1000 # buffer size in bytes

proc = subprocess.Popen([
	# binary
	"ffmpeg",
	# input: audio
	"-f","dshow","-audio_buffer_size","10","-i","audio=virtual-audio-capturer",
	# input: video
	"-f","gdigrab","-framerate","30","-i","desktop","-vf","scale=-1:480",
	# output-codec: video
	"-c:v","libx264","-pix_fmt","yuv420p","-preset","fast","-tune","zerolatency",
	# output-codec: audio
	"-c:a","aac",
	# output properties:
	"-bufsize","2M","-maxrate","1M",
	# output-file:
	"-f","mpegts",
	"-"
],stdout=subprocess.PIPE,stdin=subprocess.PIPE)

class outThread(threading.Thread):
	def __init__(self,threadId,connection,address):
		threading.Thread.__init__(self)
		self.threadId = threadId
		self.queue = queue.Queue()
		self.connection = connection
		self.address = address
		self.connection.settimeout(15)
	
	def run(self):
		try:
			while True:
				data = self.queue.get()
				self.connection.sendall(data)
		except:
			with threadsLock:
				del threads[str(self.threadId)]
			raise

class ffmpegThread(threading.Thread):
	def __init__(self):
		threading.Thread.__init__(self)
	
	def run(self):
		while proc.poll() is None:
			data = proc.stdout.read(bufferSize)
			with threadsLock:
				for thread in threads:
					thread = threads[thread]
					thread.queue.put(data)

def main():
	global threadId
	ffmpegThread().start()
	while True:
		connection, address = serverSocket.accept()
		with threadsLock:
			threadId += 1
			while str(threadId) in threads:
				threadId += 1
			
			thread = outThread(threadId,connection,address)
			threads[str(threadId)] = thread
			thread.start()

main()