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from audiocraft.models import MusicGen
import streamlit as st
import os
import torch
import torchaudio
import numpy as np
import base64

@st.cache_resource
def load_model():
    model = MusicGen.get_pretrained("facebook/musicgen-small")
    return model

def generate_music_tensors(description, duration: int):
    print("Description:", description)
    print("Duration:", duration)
    model = load_model()

    model.set_generation_params(
        use_sampling=True,
        top_k=250,
        duration=duration
    )

    output = model.generate(
        descriptions=[description],
        progress=True,
        return_tokens=True
    )
    return output[0]

def save_audio(samples: torch.Tensor):
    sample_rate = 32000  # corrected to integer
    save_path = "audio_output/"
    os.makedirs(save_path, exist_ok=True)  # ensure directory exists

    assert samples.dim() == 2 or samples.dim() == 3
    samples = samples.detach().cpu()

    if samples.dim() == 2:
        samples = samples[None, ...]
    for idx, audio in enumerate(samples):
        audio_path = os.path.join(save_path, f"audio_{idx}.wav")
        torchaudio.save(audio_path, audio, sample_rate)
    return os.path.join(save_path, "audio_0.wav")

def get_binary_file_downloader_html(bin_file, file_label='File'):
    with open(bin_file, 'rb') as f:
        data = f.read()
    bin_str = base64.b64encode(data).decode()
    href = f'<a href="data:application/octet-stream;base64,{bin_str}" download="{file_label}">Download {file_label} from here</a>'
    return href

st.set_page_config(
    page_icon=":musical_note:",
    page_title="Music Gen"
)

def main():
    st.title("Your Music")

    with st.expander("See Explanation"):
        st.write("App is developed by using Meta's Audiocraft Music Gen model. Write your text and we will generate audio")
    
    text_area = st.text_area("Enter description")
    time_slider = st.slider("Select time duration(s)", 2, 5, 20)
    
    if text_area and time_slider:
        st.json(
            {
                "Description": text_area,
                "Selected duration": time_slider
            }
        )
        st.subheader("Generated Music")
        music_tensors = generate_music_tensors(text_area, time_slider)
        audio_file_path = save_audio(music_tensors)
        audio_file = open(audio_file_path, 'rb')
        audio_bytes = audio_file.read()
        st.audio(audio_bytes)
        st.markdown(get_binary_file_downloader_html(audio_file_path, 'Audio'), unsafe_allow_html=True)

if __name__ == "__main__":
    main()