first pass at turn based conversation

vocode/turn_based/synthesizer/azure_synthesizer.py

@@ -0,0 +1,53 @@
+import os
+from dotenv import load_dotenv
+import azure.cognitiveservices.speech as speechsdk
+from pydub import AudioSegment
+
+from vocode.turn_based.synthesizer.base_synthesizer import BaseSynthesizer
+
+load_dotenv()
+
+
+class AzureSynthesizer(BaseSynthesizer):
+    def __init__(self, sampling_rate: int):
+        self.sampling_rate = sampling_rate
+        speech_config = speechsdk.SpeechConfig(
+            subscription=os.environ.get("AZURE_SPEECH_KEY"),
+            region=os.environ.get("AZURE_SPEECH_REGION"),
+        )
+        if self.sampling_rate == 44100:
+            speech_config.set_speech_synthesis_output_format(
+                speechsdk.SpeechSynthesisOutputFormat.Raw44100Hz16BitMonoPcm
+            )
+        if self.sampling_rate == 48000:
+            speech_config.set_speech_synthesis_output_format(
+                speechsdk.SpeechSynthesisOutputFormat.Raw48Khz16BitMonoPcm
+            )
+        if self.sampling_rate == 24000:
+            speech_config.set_speech_synthesis_output_format(
+                speechsdk.SpeechSynthesisOutputFormat.Raw24Khz16BitMonoPcm
+            )
+        elif self.sampling_rate == 16000:
+            speech_config.set_speech_synthesis_output_format(
+                speechsdk.SpeechSynthesisOutputFormat.Raw16Khz16BitMonoPcm
+            )
+        elif self.sampling_rate == 8000:
+            speech_config.set_speech_synthesis_output_format(
+                speechsdk.SpeechSynthesisOutputFormat.Raw8Khz16BitMonoPcm
+            )
+
+        self.synthesizer = speechsdk.SpeechSynthesizer(
+            speech_config=speech_config, audio_config=None
+        )
+
+    def synthesize(self, text) -> AudioSegment:
+        result = self.synthesizer.speak_text(text)
+        if result.reason == speechsdk.ResultReason.SynthesizingAudioCompleted:
+            return AudioSegment(
+                result.audio_data,
+                sample_width=2,
+                frame_rate=self.sampling_rate,
+                channels=1,
+            )
+        else:
+            raise Exception("Could not synthesize audio")