import asyncio import websockets import json import uuid import av # type: ignore import struct from aiortc import MediaStreamTrack, RTCPeerConnection, RTCSessionDescription # type: ignore from aiortc.contrib.media import MediaBlackhole, MediaPlayer # type: ignore import jack as Jack # type: ignore import os import re from datetime import datetime from typing import Optional, Any file_contents_ex = re.compile(r"^ws=\d$") def write_ob_status(status: bool) -> None: if not os.path.exists("/music/ob_state.conf"): print("OB State file does not exist. Bailing.") return with open("/music/ob_state.conf", "r+") as fd: content = fd.read() if "ws" in content: content = re.sub(file_contents_ex, "ws=" + str(1 if status else 0), content) else: if len(content) > 0 and content[len(content) - 1] != "\n": content += "\n" content += "ws=" + str(1 if status else 0) + "\n" fd.seek(0) fd.write(content) fd.truncate() @Jack.set_error_function # type: ignore def error(msg: str) -> None: print("Error:", msg) @Jack.set_info_function # type: ignore def info(msg: str) -> None: print("Info:", msg) jack = Jack.Client("webstudio") out1 = jack.outports.register("out_0") out2 = jack.outports.register("out_1") transfer_buffer1: Any = None transfer_buffer2: Any = None def init_buffers() -> None: global transfer_buffer1, transfer_buffer2 transfer_buffer1 = Jack.RingBuffer(jack.samplerate * 10) transfer_buffer2 = Jack.RingBuffer(jack.samplerate * 10) init_buffers() @jack.set_process_callback # type: ignore def process(frames: int) -> None: buf1 = out1.get_buffer() piece1 = transfer_buffer1.read(len(buf1)) buf1[: len(piece1)] = piece1 buf2 = out2.get_buffer() piece2 = transfer_buffer2.read(len(buf2)) buf2[: len(piece2)] = piece2 class JackSender(object): resampler: Any def __init__(self, track: MediaStreamTrack) -> None: self.track = track self.resampler = None self.ended = False def end(self) -> None: self.ended = True async def process(self) -> None: while True: if self.ended: break frame = await self.track.recv() # Right, depending on the format, we may need to do some fuckery. # Jack expects all audio to be 32 bit floating point # while PyAV may give us audio in any format # (my testing has shown it to be signed 16-bit) # We use PyAV to resample it into the right format if self.resampler is None: self.resampler = av.audio.resampler.AudioResampler( format="fltp", layout="stereo", rate=jack.samplerate ) frame.pts = None # DIRTY HACK new_frame = self.resampler.resample(frame) transfer_buffer1.write(new_frame.planes[0]) transfer_buffer2.write(new_frame.planes[1]) current_session = None class Session(object): websocket: Optional[websockets.WebSocketServerProtocol] sender: Optional[JackSender] connection_state: Optional[str] pc: Optional[Any] def __init__(self) -> None: self.websocket = None self.sender = None self.pc = None self.connection_state = None async def end(self) -> None: print(self.connection_id, "going away") if self.sender is not None: self.sender.end() if self.pc is not None: await self.pc.close() init_buffers() write_ob_status(False) if self.websocket is not None: await self.websocket.send(json.dumps({"kind": "REPLACED"})) def create_peerconnection(self) -> None: self.pc = RTCPeerConnection() assert self.pc is not None @self.pc.on("signalingstatechange") # type: ignore async def on_signalingstatechange() -> None: assert self.pc is not None print( self.connection_id, "Signaling state is {}".format(self.pc.signalingState), ) @self.pc.on("iceconnectionstatechange") # type: ignore async def on_iceconnectionstatechange() -> None: if self.pc is None: print(self.connection_id, "ICE connection state change, but the PC is None!") else: print( self.connection_id, "ICE connection state is {}".format(self.pc.iceConnectionState), ) if self.pc.iceConnectionState == "failed": await self.pc.close() self.pc = None if self.websocket is not None: await self.websocket.close(1008) return @self.pc.on("track") # type: ignore async def on_track(track: MediaStreamTrack) -> None: global current_session print(self.connection_id, "Received track") if track.kind == "audio": print(self.connection_id, "Adding to Jack.") @track.on("ended") # type: ignore async def on_ended() -> None: print(self.connection_id, "Track {} ended".format(track.kind)) # TODO: this doesn't exactly handle reconnecting gracefully self.end() self.sender = JackSender(track) if current_session is not None: await current_session.end() current_session = self write_ob_status(True) await self.sender.process() async def process_ice(self, message: Any) -> None: if self.connection_state == "HELLO" and message["kind"] == "OFFER": offer = RTCSessionDescription(sdp=message["sdp"], type=message["type"]) print(self.connection_id, "Received offer") self.create_peerconnection() assert self.pc is not None await self.pc.setRemoteDescription(offer) answer = await self.pc.createAnswer() await self.pc.setLocalDescription(answer) assert self.websocket is not None await self.websocket.send( json.dumps( { "kind": "ANSWER", "type": self.pc.localDescription.type, "sdp": self.pc.localDescription.sdp, } ) ) self.connection_state = "ANSWER" print(self.connection_id, "Sent answer") else: print( self.connection_state, "Incorrect kind {} for state {}".format( message["kind"], self.connection_state ), ) async def connect(self, websocket: websockets.WebSocketServerProtocol) -> None: self.websocket = websocket self.connection_id = uuid.uuid4() self.connection_state = "HELLO" print(self.connection_id, "Connected") await websocket.send( json.dumps({"kind": "HELLO", "connectionId": str(self.connection_id)}) ) async for msg in websocket: data = json.loads(msg) if data["kind"] == "OFFER": await self.process_ice(data) elif data["kind"] == "TIME": time = datetime.now().time() await websocket.send(json.dumps({"kind": "TIME", "time": str(time)})) else: print(self.connection_id, "Unknown kind {}".format(data["kind"])) await websocket.send( json.dumps({"kind": "ERROR", "error": "unknown_kind"}) ) async def serve(websocket: websockets.WebSocketServerProtocol, path: str) -> None: if path == "/stream": session = Session() await session.connect(websocket) else: pass WS_PORT = 8079 jack.activate() start_server = websockets.serve(serve, "localhost", WS_PORT) print("Shittyserver starting on port {}.".format(WS_PORT)) asyncio.get_event_loop().run_until_complete(start_server) asyncio.get_event_loop().run_forever()