app.py

import streamlit as st
import base64
import io
from huggingface_hub import InferenceClient
from gtts import gTTS
from pydub import AudioSegment
from pydub.playback import play
from streamlit_webrtc import webrtc_streamer, VideoProcessorBase
import cv2
import numpy as np
import speech_recognition as sr

if "history" not in st.session_state:
    st.session_state.history = []

recognizer = sr.Recognizer()

# Reconociendo voz con VAD
def recognize_speech_with_vad(audio_data, show_messages=True):
    try:
        audio_text = recognizer.recognize_google(audio_data, language="es-ES")

        if show_messages:
            st.subheader("Texto Reconocido:")
            st.write(audio_text)

    except sr.UnknownValueError:
        st.warning("No se pudo reconocer el audio. ¿Intentaste grabar algo?")
        audio_text = ""
    except sr.RequestError:
        st.error("Hablame para comenzar!")
        audio_text = ""

    return audio_text

# Procesador de video para VAD con streamlit_webrtc
class VADProcessor(AudioProcessorBase):
    def __init__(self):
        self.buffer = np.zeros((0,))
        self.vad_active = True  

    def recv(self, audio_data):
        if self.vad_active:
            audio_array = np.frombuffer(audio_data, dtype=np.int16)
            self.buffer = np.concatenate((self.buffer, audio_array), axis=None)

            if len(self.buffer) >= 44100 * 5:  # 5 seconds of audio
                st.audio(self.buffer, format="audio/wav")
                audio_text = recognize_speech_with_vad(self.buffer)

                if audio_text:
                    st.success("Frase detectada. Procesando audio...")
                    output, audio_file = generate(audio_text, history=st.session_state.history)

                    if audio_file is not None:
                        play(audio_file)

                    # Desactiva el VAD después de detectar una frase
                    self.vad_active = False

                self.buffer = np.zeros((0,))


# Preparando entrada para el modelo de lenguaje
def format_prompt(message, history):
    prompt = "<s>"

    for user_prompt, bot_response in history:
        prompt += f"[INST] {user_prompt} [/INST]"
        prompt += f" {bot_response}</s> "

    prompt += f"[INST] {message} [/INST]"
    return prompt

# Generando respuesta en texto
def generate(audio_text, history, temperature=None, max_new_tokens=512, top_p=0.95, repetition_penalty=1.0):
    client = InferenceClient("mistralai/Mixtral-8x7B-Instruct-v0.1")

    temperature = float(temperature) if temperature is not None else 0.9
    if temperature < 1e-2:
        temperature = 1e-2
    top_p = float(top_p)

    generate_kwargs = dict(
        temperature=temperature,
        max_new_tokens=max_new_tokens,
        top_p=top_p,
        repetition_penalty=repetition_penalty,
        do_sample=True,
        seed=42,
    )

    formatted_prompt = format_prompt(audio_text, history)
    stream = client.text_generation(formatted_prompt, **generate_kwargs, stream=True, details=True, return_full_text=True)
    response = ""

    for response_token in stream:
        response += response_token.token.text
    
    response = ' '.join(response.split()).replace('</s>', '')
    audio_file = text_to_speech(response, speed=1.3)
    return response, audio_file

# Texto a voz
def text_to_speech(text, speed=1.3):
    tts = gTTS(text=text, lang='es')
    audio_fp = io.BytesIO()
    tts.write_to_fp(audio_fp)
    audio_fp.seek(0)
    audio = AudioSegment.from_file(audio_fp, format="mp3")
    modified_speed_audio = audio.speedup(playback_speed=speed)
    modified_audio_fp = io.BytesIO()
    modified_speed_audio.export(modified_audio_fp, format="mp3")
    modified_audio_fp.seek(0)
    return modified_audio_fp

# Reproductor de texto a voz
def audio_player_markup(audio_file):
    return f"""
        <audio autoplay="autoplay" controls="controls" src="data:audio/mp3;base64,{base64.b64encode(audio_file.read()).decode()}" type="audio/mp3" id="audio_player"></audio>
    """

# Interfaz de usuario con streamlit_webrtc
def main():
    st.title("Chatbot de Voz a Voz")

    webrtc_ctx = webrtc_streamer(
        key="vad",
        audio_processor_factory=VADProcessor,
        async_processing=True,
        media_stream_constraints={"video": False, "audio": True}, 
    )

if __name__ == "__main__":
    main()