app.py

import gradio as gr
from gradio_webrtc import WebRTC, AdditionalOutputs, ReplyOnPause
from pydub import AudioSegment
from io import BytesIO
import numpy as np
import librosa
import tempfile
from twilio.rest import Client
import os
import spaces
from transformers import Qwen2AudioForConditionalGeneration, AutoProcessor

processor = AutoProcessor.from_pretrained("Qwen/Qwen2-Audio-7B-Instruct")
model = Qwen2AudioForConditionalGeneration.from_pretrained("Qwen/Qwen2-Audio-7B-Instruct", device_map="auto")

account_sid = os.environ.get("TWILIO_ACCOUNT_SID")
auth_token = os.environ.get("TWILIO_AUTH_TOKEN")

if account_sid and auth_token:
    client = Client(account_sid, auth_token)

    token = client.tokens.create()

    rtc_configuration = {
        "iceServers": token.ice_servers,
        "iceTransportPolicy": "relay",
    }
else:
    rtc_configuration = None


@spaces.GPU
def transcribe(audio: tuple[int, np.ndarray], transformers_convo: list[dict], gradio_convo: list[dict]):
    segment = AudioSegment(audio[1].tobytes(), frame_rate=audio[0], sample_width=audio[1].dtype.itemsize, channels=1)

    with tempfile.NamedTemporaryFile(suffix=".mp3") as temp_audio:
        segment.export(temp_audio.name, format="mp3")
        transformers_convo.append({"role": "user", "content": [{"type": "audio", "audio_url": temp_audio.name}]})
        gradio_convo.append({"role": "assistant", "content": gr.Audio(value=temp_audio.name)})
        text = processor.apply_chat_template(transformers_convo, add_generation_prompt=True, tokenize=False)
        audios = []
        for message in transformers_convo:
            if isinstance(message["content"], list):
                for ele in message["content"]:
                    if ele["type"] == "audio":
                        audios.append(librosa.load(
                            BytesIO(open(ele['audio_url'], "rb").read()), 
                            sr=processor.feature_extractor.sampling_rate)[0]
                        )
        inputs = processor(text=text, audios=audios, return_tensors="pt", padding=True)
        inputs.input_ids = inputs.input_ids.to("cuda")

        generate_ids = model.generate(**inputs, max_length=256)
        generate_ids = generate_ids[:, inputs.input_ids.size(1):]
        response = processor.batch_decode(generate_ids, skip_special_tokens=True, clean_up_tokenization_spaces=False)[0]
        print("response", response)
        transformers_convo.append({"role": "assistant", "content": response})
        gradio_convo.append({"role": "assistant", "content": response})

        yield AdditionalOutputs(transformers_convo, gradio_convo)


with gr.Blocks() as demo:
    transformers_convo = gr.State()
    with gr.Row():
        with gr.Column():
            audio = WebRTC(
                rtc_configuration=rtc_configuration,
                label="Stream",
                mode="send",
                modality="audio",
            )
        with gr.Column():
            transcript = gr.Chatbot(label="transcript", type="messages")

    audio.stream(ReplyOnPause(transcribe), inputs=[audio, transformers_convo, transcript], outputs=[audio])
    audio.on_additional_outputs(lambda s: s, outputs=[transformers_convo, transcript])

if __name__ == "__main__":
    demo.launch()