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import asyncio
import logging
from typing import List
import av
import streamlit as st
from streamlit_webrtc import WebRtcMode, webrtc_streamer
logger = logging.getLogger(__name__)
delay = st.slider("Delay", 0.0, 5.0, 1.0, 0.05)
async def queued_video_frames_callback(
frames: List[av.VideoFrame],
) -> List[av.VideoFrame]:
logger.debug("Delay: %f", delay)
# A standalone `await ...` is interpreted as an expression and
# the Streamlit magic's target, which leads implicit calls of `st.write`.
# To prevent it, fix it as `_ = await ...`, a statement.
# See https://discuss.streamlit.io/t/issue-with-asyncio-run-in-streamlit/7745/15
await asyncio.sleep(delay)
return frames
async def queued_audio_frames_callback(
frames: List[av.AudioFrame],
) -> List[av.AudioFrame]:
await asyncio.sleep(delay)
return frames
webrtc_streamer(
key="delay",
mode=WebRtcMode.SENDRECV,
rtc_configuration={"iceServers": [{"urls": ["stun:stun.l.google.com:19302"]}]},
queued_video_frames_callback=queued_video_frames_callback,
queued_audio_frames_callback=queued_audio_frames_callback,
async_processing=True,
)
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