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This is the main calling python script that will invoke the rev_ai template to capture the chunk voice data & stream it to the service for text translation & return the response to app.
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| ##################################################### | |
| #### Modified By: SATYAKI DE #### | |
| #### Modified On 28-Jan-2023 #### | |
| #### #### | |
| #### Objective: This is the main calling #### | |
| #### python script that will invoke the #### | |
| #### rev_ai template to capture the chunk voice #### | |
| #### data & stream it to the service for text #### | |
| #### translation & return the response to app. #### | |
| ##################################################### | |
| import pyaudio | |
| from rev_ai.models import MediaConfig | |
| from six.moves import queue | |
| # Disbling Warning | |
| def warn(*args, **kwargs): | |
| pass | |
| import warnings | |
| warnings.warn = warn | |
| class clsMicrophoneStream(object): | |
| ############################################# | |
| ### Opens a recording stream as a #### | |
| ### generator yielding the audio chunks. #### | |
| ############################################# | |
| def __init__(self, rate, chunk): | |
| self._rate = rate | |
| self._chunk = chunk | |
| ################################################## | |
| ### Create a thread-safe buffer of audio data #### | |
| ################################################## | |
| self._buff = queue.Queue() | |
| self.closed = True | |
| def __enter__(self): | |
| self._audio_interface = pyaudio.PyAudio() | |
| self._audio_stream = self._audio_interface.open( | |
| format=pyaudio.paInt16, | |
| ######################################################### | |
| ### The API currently only supports 1-channel (mono) #### | |
| ### audio. #### | |
| ######################################################### | |
| channels=1, rate=self._rate, | |
| input=True, frames_per_buffer=self._chunk, | |
| #################################################################### | |
| ### Run the audio stream asynchronously to fill the buffer #### | |
| ### object. Run the audio stream asynchronously to fill the #### | |
| ### buffer object. This is necessary so that the input device's #### | |
| ### buffer doesn't overflow while the calling thread makes #### | |
| ### network requests, etc. #### | |
| #################################################################### | |
| stream_callback=self._fill_buffer, | |
| ) | |
| self.closed = False | |
| return self | |
| def __exit__(self, type, value, traceback): | |
| self._audio_stream.stop_stream() | |
| self._audio_stream.close() | |
| self.closed = True | |
| ############################################################### | |
| ### Signal the generator to terminate so that the client's #### | |
| ### streaming_recognize method will not block the process #### | |
| ### termination. #### | |
| ############################################################### | |
| self._buff.put(None) | |
| self._audio_interface.terminate() | |
| def _fill_buffer(self, in_data, frame_count, time_info, status_flags): | |
| ############################################################## | |
| ### Continuously collect data from the audio stream, into #### | |
| ### the buffer. #### | |
| ############################################################## | |
| self._buff.put(in_data) | |
| return None, pyaudio.paContinue | |
| def generator(self): | |
| while not self.closed: | |
| ###################################################################### | |
| ### Use a blocking get() to ensure there's at least one chunk of #### | |
| ### data, and stop iteration if the chunk is None, indicating the #### | |
| ### end of the audio stream. #### | |
| ###################################################################### | |
| chunk = self._buff.get() | |
| if chunk is None: | |
| return | |
| data = [chunk] | |
| ########################################################## | |
| ### Now consume whatever other data's still buffered. #### | |
| ########################################################## | |
| while True: | |
| try: | |
| chunk = self._buff.get(block=False) | |
| if chunk is None: | |
| return | |
| data.append(chunk) | |
| except queue.Empty: | |
| break | |
| yield b''.join(data) |
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