【发布时间】：2021-04-23 16:21:18
【问题描述】：
我正在尝试使用 Autobahn python 构建一个 websocket 服务器，该服务器充当 IBM Watson 文本到语音服务的中间人或中继。我已经设法使用队列从客户端接收流式音频并将其转发到 Watson，并且我正在从 Watson 接收回转录假设作为 JSON 数据到我的服务器，但我不确定如何转发该 JSON 数据到客户端。似乎 Watson 转录端回调和 Autobahn 客户端回调独立存在，我无法从另一个回调中的一个回调调用例程，也无法从另一个回调中的一个回调访问数据。
我需要设置某种共享短信队列吗？我确信这应该是一些简单的事情，但我认为问题可能是我对“self”关键字缺乏理解，这似乎将这两个例程隔离开来。也将感谢任何有关理解“自我”的资源。
# For Watson
from ibm_watson import SpeechToTextV1
from ibm_watson.websocket import RecognizeCallback, AudioSource
from threading import Thread
from ibm_cloud_sdk_core.authenticators import IAMAuthenticator
# For Autobahn
from autobahn.twisted.websocket import WebSocketServerProtocol, \
WebSocketServerFactory
from twisted.internet import reactor
try:
from Queue import Queue, Full
except ImportError:
from queue import Queue, Full
###############################################
#### Initalize queue to store the recordings ##
###############################################
CHUNK = 1024
BUF_MAX_SIZE = CHUNK * 10
# Buffer to store audio
q = Queue(maxsize=int(round(BUF_MAX_SIZE / CHUNK)))
# Create an instance of AudioSource
audio_source = AudioSource(q, True, True)
###############################################
#### Prepare Speech to Text Service ########
###############################################
# initialize speech to text service
authenticator = IAMAuthenticator('secretapikeycanttellyou')
speech_to_text = SpeechToTextV1(authenticator=authenticator)
# define callback for the speech to text service
class MyRecognizeCallback(RecognizeCallback):
def __init__(self):
RecognizeCallback.__init__(self)
def on_transcription(self, transcript):
print(transcript)
def on_connected(self):
print('Connection was successful')
def on_error(self, error):
print('Error received: {}'.format(error))
def on_inactivity_timeout(self, error):
print('Inactivity timeout: {}'.format(error))
def on_listening(self):
print('Service is listening')
def on_hypothesis(self, hypothesis):
print(hypothesis)
#self.sendMessage(hypothesis, isBinary = false)
# HOW TO FORWARD THIS TO CLIENT?
def on_data(self, data):
print(data)
#self.sendMessage(data, isBinary = false)
# HOW TO FORWARD THIS TO CLIENT?
def on_close(self):
print("Connection closed")
# define callback for client-side websocket in Autobahn
class MyServerProtocol(WebSocketServerProtocol):
def onConnect(self, request):
print("Client connecting: {0}".format(request.peer))
def onOpen(self):
print("WebSocket connection open.")
recognize_thread = Thread(target=recognize_using_weboscket, args=())
recognize_thread.daemon = True
recognize_thread.start()
def onMessage(self, payload, isBinary):
if isBinary:
# put audio in queue
q.put(payload)
else:
print("Text message received: {0}".format(payload.decode('utf8')))
# echo back message verbatim
self.sendMessage(payload, isBinary)
def onClose(self, wasClean, code, reason):
print("WebSocket connection closed: {0}".format(reason))
## this function will initiate the recognize service and pass in the AudioSource
def recognize_using_weboscket(*args):
mycallback = MyRecognizeCallback()
speech_to_text.recognize_using_websocket(audio=audio_source,
content_type='audio/l16; rate=16000',
recognize_callback=mycallback,
interim_results=True)
if __name__ == '__main__':
factory = WebSocketServerFactory("ws://127.0.0.1:9001")
factory.protocol = MyServerProtocol
reactor.listenTCP(9001, factory)
reactor.run()
看来我需要弥合MyRecognizeCallback() 和MyServerProtocol() 之间的差距。也请让我知道这是否是我想要完成的一个糟糕的实现。我知道有更简单的方法来中继 websocket 数据，但我想熟悉 websocket API/音频流和文本消息，因为最终我想从等式中删除 Watson 并使用我自己的转录算法。
【问题讨论】：
标签： python json audio websocket autobahn