You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
111 lines
4.9 KiB
111 lines
4.9 KiB
3 years ago
|
# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
|
||
|
|
#
|
||
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
# you may not use this file except in compliance with the License.
|
||
|
|
# You may obtain a copy of the License at
|
||
|
|
#
|
||
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
#
|
||
|
|
# Unless required by applicable law or agreed to in writing, software
|
||
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
# See the License for the specific language governing permissions and
|
||
|
|
# limitations under the License.
|
||
|
|
import json
|
||
|
|
|
||
|
|
from fastapi import APIRouter
|
||
|
|
from fastapi import WebSocket
|
||
|
|
from fastapi import WebSocketDisconnect
|
||
|
|
from starlette.websockets import WebSocketState as WebSocketState
|
||
|
|
|
||
|
|
from paddlespeech.server.engine.asr.online.asr_engine import PaddleASRConnectionHanddler
|
||
|
|
from paddlespeech.server.engine.engine_pool import get_engine_pool
|
||
|
|
|
||
|
|
router = APIRouter()
|
||
|
|
|
||
|
|
|
||
|
|
@router.websocket('/paddlespeech/asr/streaming')
|
||
|
|
async def websocket_endpoint(websocket: WebSocket):
|
||
|
|
"""PaddleSpeech Online ASR Server api
|
||
|
|
|
||
|
|
Args:
|
||
|
|
websocket (WebSocket): the websocket instance
|
||
|
|
"""
|
||
|
|
|
||
|
|
#1. the interface wait to accept the websocket protocal header
|
||
|
|
# and only we receive the header, it establish the connection with specific thread
|
||
|
|
await websocket.accept()
|
||
|
|
|
||
|
|
#2. if we accept the websocket headers, we will get the online asr engine instance
|
||
|
|
engine_pool = get_engine_pool()
|
||
|
|
asr_engine = engine_pool['asr']
|
||
|
|
|
||
|
|
#3. each websocket connection, we will create an PaddleASRConnectionHanddler to process such audio
|
||
|
|
# and each connection has its own connection instance to process the request
|
||
|
|
# and only if client send the start signal, we create the PaddleASRConnectionHanddler instance
|
||
|
|
connection_handler = None
|
||
|
|
|
||
|
|
try:
|
||
|
|
#4. we do a loop to process the audio package by package according the protocal
|
||
|
|
# and only if the client send finished signal, we will break the loop
|
||
|
|
while True:
|
||
|
|
# careful here, changed the source code from starlette.websockets
|
||
|
|
# 4.1 we wait for the client signal for the specific action
|
||
|
|
assert websocket.application_state == WebSocketState.CONNECTED
|
||
|
|
message = await websocket.receive()
|
||
|
|
websocket._raise_on_disconnect(message)
|
||
|
|
|
||
|
|
#4.2 text for the action command and bytes for pcm data
|
||
|
|
if "text" in message:
|
||
|
|
# we first parse the specific command
|
||
|
|
message = json.loads(message["text"])
|
||
|
|
if 'signal' not in message:
|
||
|
|
resp = {"status": "ok", "message": "no valid json data"}
|
||
|
|
await websocket.send_json(resp)
|
||
|
|
|
||
|
|
# start command, we create the PaddleASRConnectionHanddler instance to process the audio data
|
||
|
|
# end command, we process the all the last audio pcm and return the final result
|
||
|
|
# and we break the loop
|
||
|
|
if message['signal'] == 'start':
|
||
|
|
resp = {"status": "ok", "signal": "server_ready"}
|
||
|
|
# do something at begining here
|
||
|
|
# create the instance to process the audio
|
||
|
|
connection_handler = PaddleASRConnectionHanddler(asr_engine)
|
||
|
|
await websocket.send_json(resp)
|
||
|
|
elif message['signal'] == 'end':
|
||
|
|
# reset single engine for an new connection
|
||
|
|
# and we will destroy the connection
|
||
|
|
connection_handler.decode(is_finished=True)
|
||
|
|
connection_handler.rescoring()
|
||
|
|
asr_results = connection_handler.get_result()
|
||
|
|
word_time_stamp = connection_handler.get_word_time_stamp()
|
||
|
|
connection_handler.reset()
|
||
|
|
|
||
|
|
resp = {
|
||
|
|
"status": "ok",
|
||
|
|
"signal": "finished",
|
||
|
|
'result': asr_results,
|
||
|
|
'times': word_time_stamp
|
||
|
|
}
|
||
|
|
await websocket.send_json(resp)
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
resp = {"status": "ok", "message": "no valid json data"}
|
||
|
|
await websocket.send_json(resp)
|
||
|
|
elif "bytes" in message:
|
||
|
|
# bytes for the pcm data
|
||
|
|
message = message["bytes"]
|
||
|
|
|
||
|
|
# we extract the remained audio pcm
|
||
|
|
# and decode for the result in this package data
|
||
|
|
connection_handler.extract_feat(message)
|
||
|
|
connection_handler.decode(is_finished=False)
|
||
|
|
asr_results = connection_handler.get_result()
|
||
|
|
|
||
|
|
# return the current period result
|
||
|
|
# if the engine create the vad instance, this connection will have many period results
|
||
|
|
resp = {'result': asr_results}
|
||
|
|
await websocket.send_json(resp)
|
||
|
|
except WebSocketDisconnect:
|
||
|
|
pass
|