app.py

import gradio as gr
import google.generativeai as genai
import numpy as np
import re
import torch
from transformers import AutoModelForCausalLM, AutoTokenizer
from huggingface_hub import snapshot_download, login
import logging
import os
import spaces
import warnings
import librosa

# Set up logging
logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')
logger = logging.getLogger(__name__)

# Suppress specific warnings
warnings.filterwarnings("ignore", category=UserWarning, message="Trying to convert audio automatically from float32 to 16-bit int format.")
warnings.filterwarnings("ignore", category=RuntimeWarning, message="invalid value encountered in divide")
warnings.filterwarnings("ignore", category=RuntimeWarning, message="invalid value encountered in cast")

def get_device():
    if torch.cuda.is_available():
        return torch.device("cuda")
    return torch.device("cpu")

device = get_device()
logger.info(f"Using device: {device}")

model = None
tokenizer = None

@spaces.GPU()
def load_model():
    global model, tokenizer
    
    logger.info("Loading Orpheus model...")
    model_name = "canopylabs/orpheus-3b-0.1-ft"

    hf_token = os.environ.get("HUGGINGFACE_TOKEN")
    if not hf_token:
        raise ValueError("HUGGINGFACE_TOKEN environment variable is not set")

    try:
        login(token=hf_token)

        snapshot_download(
            repo_id=model_name,
            use_auth_token=hf_token,
            allow_patterns=[
                "config.json",
                "*.safetensors",
                "model.safetensors.index.json",
            ],
            ignore_patterns=[
                "optimizer.pt",
                "pytorch_model.bin",
                "training_args.bin",
                "scheduler.pt",
                "tokenizer.json",
                "tokenizer_config.json",
                "special_tokens_map.json",
                "vocab.json",
                "merges.txt",
                "tokenizer.*"
            ]
        )

        model = AutoModelForCausalLM.from_pretrained(model_name, torch_dtype=torch.float32 if device.type == 'cpu' else torch.bfloat16)
        model.to(device)
        tokenizer = AutoTokenizer.from_pretrained(model_name)
        logger.info(f"Orpheus model and tokenizer loaded to {device}")
    except Exception as e:
        logger.error(f"Error loading model: {str(e)}")
        raise

def generate_podcast_script(api_key, content, uploaded_file, duration, num_hosts):
    try:
        genai.configure(api_key=api_key)
        model = genai.GenerativeModel('gemini-2.5-pro-preview-03-25')
        
        combined_content = content or ""
        if uploaded_file:
            file_content = uploaded_file.read().decode('utf-8')
            combined_content += "\n" + file_content if combined_content else file_content
        
        prompt = f"""
        Create a podcast script for {'one person' if num_hosts == 1 else 'two people'} discussing:
        {combined_content}
        
        Duration: {duration}. Include natural speech, humor, and occasional off-topic thoughts.
        Use speech fillers like um, ah. Vary emotional tone.
        
        Format: {'Monologue' if num_hosts == 1 else 'Alternating dialogue'} without speaker labels.
        Separate {'paragraphs' if num_hosts == 1 else 'lines'} with blank lines.
        
        Use emotion tags in angle brackets: <laugh>, <sigh>, <chuckle>, <cough>, <sniffle>, <groan>, <yawn>, <gasp>.
        
        Example: "I can't believe I stayed up all night <yawn> only to find out the meeting was canceled <groan>."
        
        Ensure content flows naturally and stays on topic. Match the script length to {duration}.
        """
        
        response = model.generate_content(prompt)
        return re.sub(r'[^a-zA-Z0-9\s.,?!<>]', '', response.text)
    except Exception as e:
        logger.error(f"Error generating podcast script: {str(e)}")
        raise

@spaces.GPU()
def text_to_speech(text, voice):
    global model, tokenizer
    try:
        if model is None or tokenizer is None:
            load_model()
        
        inputs = tokenizer(text, return_tensors="pt").to(device)
        with torch.no_grad():
            output = model.generate(**inputs, max_new_tokens=256)
        mel = output[0].cpu().numpy()
        audio = mel_to_audio(mel)
        return audio
    except Exception as e:
        logger.error(f"Error in text_to_speech: {str(e)}")
        raise

def mel_to_audio(mel):
    try:
        # Convert mel spectrogram to audio using librosa
        audio = librosa.feature.inverse.mel_to_audio(mel, sr=24000, n_iter=10)
        return audio
    except Exception as e:
        logger.error(f"Error in mel_to_audio conversion: {str(e)}")
        # Return silence if conversion fails
        return np.zeros(24000, dtype=np.float32)

@spaces.GPU()
def render_podcast(api_key, script, voice1, voice2, num_hosts):
    try:
        lines = [line for line in script.split('\n') if line.strip()]
        audio_segments = []

        for i, line in enumerate(lines):
            voice = voice1 if num_hosts == 1 or i % 2 == 0 else voice2
            try:
                audio = text_to_speech(line, voice)
                audio_segments.append(audio)
            except Exception as e:
                logger.error(f"Error processing audio segment: {str(e)}")

        if not audio_segments:
            logger.warning("No valid audio segments were generated.")
            return (24000, np.zeros(24000, dtype=np.float32))

        podcast_audio = np.concatenate(audio_segments)
        
        # Ensure the audio is in the correct format for Gradio
        podcast_audio = np.clip(podcast_audio, -1, 1)
        podcast_audio = (podcast_audio * 32767).astype(np.int16)
        
        return (24000, podcast_audio)
    except Exception as e:
        logger.error(f"Error rendering podcast: {str(e)}")
        raise

with gr.Blocks() as demo:
    gr.Markdown("# AI Podcast Generator")
    
    api_key_input = gr.Textbox(label="Enter your Gemini API Key", type="password")
    
    with gr.Row():
        content_input = gr.Textbox(label="Paste your content (optional)")
        document_upload = gr.File(label="Upload Document (optional)")
    
    duration = gr.Radio(["1-5 min", "5-10 min", "10-15 min"], label="Estimated podcast duration")
    num_hosts = gr.Radio([1, 2], label="Number of podcast hosts", value=2)
    
    voice_options = ["tara", "leah", "jess", "leo", "dan", "mia", "zac", "zoe"]
    voice1_select = gr.Dropdown(label="Select Voice 1", choices=voice_options, value="tara")
    voice2_select = gr.Dropdown(label="Select Voice 2", choices=voice_options, value="leo")
    
    generate_btn = gr.Button("Generate Script")
    script_output = gr.Textbox(label="Generated Script", lines=10)
    
    render_btn = gr.Button("Render Podcast")
    audio_output = gr.Audio(label="Generated Podcast")
    
    generate_btn.click(generate_podcast_script, 
                       inputs=[api_key_input, content_input, document_upload, duration, num_hosts], 
                       outputs=script_output)
    
    render_btn.click(render_podcast, 
                     inputs=[api_key_input, script_output, voice1_select, voice2_select, num_hosts], 
                     outputs=audio_output)

    num_hosts.change(lambda x: gr.update(visible=x == 2), 
                     inputs=[num_hosts], 
                     outputs=[voice2_select])

if __name__ == "__main__":
    try:
        load_model()
        demo.launch()
    except Exception as e:
        logger.error(f"Error launching the application: {str(e)}")