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__init__.py
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__init__.py
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"""streamlit-webrtc
"""
import json
import logging
import os
from typing import Callable, Dict, Hashable, NamedTuple, Optional, Union
try:
from typing import TypedDict
except ImportError:
# Python < 3.8
from typing_extensions import TypedDict
try:
import importlib.metadata as importlib_metadata
except ModuleNotFoundError:
# Python < 3.8
import importlib_metadata # type: ignore
import streamlit as st
import streamlit.components.v1 as components
from . import SessionState
from .config import MediaStreamConstraints, RTCConfiguration
from .webrtc import (
MediaPlayerFactory,
MediaRecorderFactory,
VideoReceiver,
VideoTransformerBase,
WebRtcMode,
WebRtcWorker,
)
# Set __version__ dynamically base on metadata.
# https://github.com/python-poetry/poetry/issues/1036#issuecomment-489880822
# https://github.com/python-poetry/poetry/issues/144#issuecomment-623927302
# https://github.com/python-poetry/poetry/pull/2366#issuecomment-652418094
try:
__version__ = importlib_metadata.version(__name__)
except importlib_metadata.PackageNotFoundError:
pass
LOGGER = logging.getLogger(__name__)
LOGGER.addHandler(logging.NullHandler())
_RELEASE = True # TODO: How to dynamically manage this variable?
if not _RELEASE:
_component_func = components.declare_component(
"webrtc_streamer",
url="http://localhost:3001",
)
else:
parent_dir = os.path.dirname(os.path.abspath(__file__))
build_dir = os.path.join(parent_dir, "frontend/build")
_component_func = components.declare_component("webrtc_streamer", path=build_dir)
_session_state = SessionState.get(webrtc_workers={})
def _get_webrtc_worker(key: Hashable) -> Union[WebRtcWorker, None]:
return _session_state.webrtc_workers.get(key)
def _set_webrtc_worker(key: Hashable, webrtc_worker: WebRtcWorker) -> None:
_session_state.webrtc_workers[key] = webrtc_worker
def _unset_webrtc_worker(key: Hashable) -> None:
del _session_state.webrtc_workers[key]
class ClientSettings(TypedDict):
rtc_configuration: Optional[RTCConfiguration]
media_stream_constraints: Optional[MediaStreamConstraints]
class WebRtcWorkerState(NamedTuple):
playing: bool
class WebRtcWorkerContext(NamedTuple):
state: WebRtcWorkerState
video_transformer: Optional[VideoTransformerBase]
video_receiver: Optional[VideoReceiver]
def webrtc_streamer(
key: str,
mode: WebRtcMode = WebRtcMode.SENDRECV,
client_settings: Optional[ClientSettings] = None,
player_factory: Optional[MediaPlayerFactory] = None,
in_recorder_factory: Optional[MediaRecorderFactory] = None,
out_recorder_factory: Optional[MediaRecorderFactory] = None,
video_transformer_factory: Optional[Callable[[], VideoTransformerBase]] = None,
async_transform: bool = True,
) -> WebRtcWorkerContext:
webrtc_worker = _get_webrtc_worker(key)
sdp_answer_json = None
if webrtc_worker:
sdp_answer_json = json.dumps(
{
"sdp": webrtc_worker.pc.localDescription.sdp,
"type": webrtc_worker.pc.localDescription.type,
}
)
component_value: Union[Dict, None] = _component_func(
key=key,
sdp_answer_json=sdp_answer_json,
mode=mode.name,
settings=client_settings,
)
playing = False
if component_value:
playing = component_value.get("playing", False)
sdp_offer = component_value.get("sdpOffer")
if webrtc_worker:
if not playing:
webrtc_worker.stop()
_unset_webrtc_worker(key)
else:
if sdp_offer:
webrtc_worker = WebRtcWorker(
mode=mode,
player_factory=player_factory,
in_recorder_factory=in_recorder_factory,
out_recorder_factory=out_recorder_factory,
video_transformer_factory=video_transformer_factory,
async_transform=async_transform,
)
webrtc_worker.process_offer(sdp_offer["sdp"], sdp_offer["type"])
_set_webrtc_worker(key, webrtc_worker)
st.experimental_rerun() # Rerun to send the SDP answer to frontend
ctx = WebRtcWorkerContext(
state=WebRtcWorkerState(playing=playing),
video_transformer=webrtc_worker.video_transformer if webrtc_worker else None,
video_receiver=webrtc_worker.video_receiver if webrtc_worker else None,
)
return ctx