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import argparse
import asyncio
import logging
import math
import cv2
import numpy
from aiortc import (
RTCIceCandidate,
RTCPeerConnection,
RTCSessionDescription,
VideoStreamTrack,
)
from aiortc.contrib.media import MediaBlackhole, MediaPlayer, MediaRecorder
from aiortc.contrib.signaling import BYE, add_signaling_arguments, create_signaling
from av import VideoFrame
class FlagVideoStreamTrack(VideoStreamTrack):
"""
A video track that returns an animated flag.
"""
def __init__(self):
super().__init__() # don't forget this!
self.counter = 0
height, width = 480, 640
# generate flag
data_bgr = numpy.hstack(
[
self._create_rectangle(
width=213, height=480, color=(255, 0, 0)
), # blue
self._create_rectangle(
width=214, height=480, color=(255, 255, 255)
), # white
self._create_rectangle(width=213, height=480, color=(0, 0, 255)), # red
]
)
# shrink and center it
M = numpy.float32([[0.5, 0, width / 4], [0, 0.5, height / 4]])
data_bgr = cv2.warpAffine(data_bgr, M, (width, height))
# compute animation
omega = 2 * math.pi / height
id_x = numpy.tile(numpy.array(range(width), dtype=numpy.float32), (height, 1))
id_y = numpy.tile(
numpy.array(range(height), dtype=numpy.float32), (width, 1)
).transpose()
self.frames = []
for k in range(30):
phase = 2 * k * math.pi / 30
map_x = id_x + 10 * numpy.cos(omega * id_x + phase)
map_y = id_y + 10 * numpy.sin(omega * id_x + phase)
self.frames.append(
VideoFrame.from_ndarray(
cv2.remap(data_bgr, map_x, map_y, cv2.INTER_LINEAR), format="bgr24"
)
)
async def recv(self):
pts, time_base = await self.next_timestamp()
frame = self.frames[self.counter % 30]
frame.pts = pts
frame.time_base = time_base
self.counter += 1
return frame
def _create_rectangle(self, width, height, color):
data_bgr = numpy.zeros((height, width, 3), numpy.uint8)
data_bgr[:, :] = color
return data_bgr
async def run(pc, player, recorder, signaling, role):
def add_tracks():
if player and player.audio:
pc.addTrack(player.audio)
if player and player.video:
pc.addTrack(player.video)
else:
pc.addTrack(FlagVideoStreamTrack())
@pc.on("track")
def on_track(track):
print("Receiving %s" % track.kind)
recorder.addTrack(track)
# connect signaling
await signaling.connect()
if role == "offer":
# send offer
add_tracks()
await pc.setLocalDescription(await pc.createOffer())
await signaling.send(pc.localDescription)
# consume signaling
while True:
obj = await signaling.receive()
if isinstance(obj, RTCSessionDescription):
await pc.setRemoteDescription(obj)
await recorder.start()
if obj.type == "offer":
# send answer
add_tracks()
await pc.setLocalDescription(await pc.createAnswer())
await signaling.send(pc.localDescription)
elif isinstance(obj, RTCIceCandidate):
await pc.addIceCandidate(obj)
elif obj is BYE:
print("Exiting")
break
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Video stream from the command line")
parser.add_argument("role", choices=["offer", "answer"])
parser.add_argument("--play-from", help="Read the media from a file and sent it.")
parser.add_argument("--record-to", help="Write received media to a file.")
parser.add_argument("--verbose", "-v", action="count")
add_signaling_arguments(parser)
args = parser.parse_args()
if args.verbose:
logging.basicConfig(level=logging.DEBUG)
# create signaling and peer connection
signaling = create_signaling(args)
pc = RTCPeerConnection()
# create media source
if args.play_from:
player = MediaPlayer(args.play_from)
else:
player = None
# create media sink
if args.record_to:
recorder = MediaRecorder(args.record_to)
else:
recorder = MediaBlackhole()
# run event loop
loop = asyncio.get_event_loop()
try:
loop.run_until_complete(
run(
pc=pc,
player=player,
recorder=recorder,
signaling=signaling,
role=args.role,
)
)
except KeyboardInterrupt:
pass
finally:
# cleanup
loop.run_until_complete(recorder.stop())
loop.run_until_complete(signaling.close())
loop.run_until_complete(pc.close())
|
