STT on Mac using Speech framework

mac_stt.py

from datetime import datetime, timedelta

from Speech import SFSpeechRecognizer, SFSpeechAudioBufferRecognitionRequest
from AppKit import NSRunLoop

from PyObjCTools import AppHelper

import AVFoundation

# https://developer.apple.com/documentation/speech/recognizing_speech_in_live_audio
# https://github.com/SKaplanOfficial/PyXA/blob/11c7d4db4623b91415bd962d41ff3747a2808163/PyXA/Additions/Speech.py#L85

# to be able to ctrl-c
AppHelper.installMachInterrupt()

class STT(object):
    def __init__(self, live_panel=None):
        SFSpeechRecognizer.requestAuthorization_(None)

        self.audio_session = AVFoundation.AVAudioSession.sharedInstance()

        self.audio_engine = AVFoundation.AVAudioEngine.alloc().init()
        self.input_node = self.audio_engine.inputNode()
        self.recording_format = self.input_node.outputFormatForBus_(0)
        self.audio_engine.prepare()
        self.audio_engine.startAndReturnError_(None)
        self.input_node.installTapOnBus_bufferSize_format_block_(
                0, 1024, self.recording_format, self._process_buffer_callback
                )

        self.live_panel = live_panel

    def _process_buffer_callback(self, buffer, timing):
        self.recognition_request.appendAudioPCMBuffer_(buffer)

    def _process_speech_detection(self, result, error):
        if error is not None:
            print(f"Error! {error}")
            return

        best = result.bestTranscription()
        if self.live_panel is not None:
            self.live_panel.update(best.formattedString())

    def _setup(self):
        self.recognizer = SFSpeechRecognizer.alloc().init()
        self.recognition_request = SFSpeechAudioBufferRecognitionRequest.alloc().init()
        self.recognition_request.setShouldReportPartialResults_(True)
        self.recognition_request.setAddsPunctuation_(True)
        self.recognition_task = self.recognizer.recognitionTaskWithRequest_resultHandler_(self.recognition_request, self._process_speech_detection)

    def run(self):
        self._setup()
        NSRunLoop.currentRunLoop().runUntilDate_(datetime.now() + timedelta(seconds = 30))


if __name__ == "__main__":
    from rich.live import Live
    live = Live()
    live.start()
    stt = STT(live_panel=live)
    stt.run()
    live.stop()