demos/musicgen_app.py

# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.

# This source code is licensed under the license found in the
# LICENSE file in the root directory of this source tree.

# Updated to account for UI changes from https://github.com/rkfg/audiocraft/blob/long/app.py
# also released under the MIT license.

import argparse
from concurrent.futures import ProcessPoolExecutor
import logging
import os
from pathlib import Path
import subprocess as sp
import sys
from tempfile import NamedTemporaryFile
import time
import typing as tp
import warnings
import base64

from einops import rearrange
import torch
import gradio as gr

from audiocraft.data.audio_utils import convert_audio
from audiocraft.data.audio import audio_write
from audiocraft.models.encodec import InterleaveStereoCompressionModel
from audiocraft.models import MusicGen, MultiBandDiffusion

from pydub import AudioSegment
import io

SECRET_TOKEN = os.getenv('SECRET_TOKEN', 'default_secret')

MODEL = None  # Last used model
SPACE_ID = os.environ.get('SPACE_ID', '')
IS_BATCHED = False # <- we hardcode it
MAX_BATCH_SIZE = 12
BATCHED_DURATION = 15
INTERRUPTING = False
MBD = None
# We have to wrap subprocess call to clean a bit the log when using gr.make_waveform
_old_call = sp.call


def _call_nostderr(*args, **kwargs):
    # Avoid ffmpeg vomiting on the logs.
    kwargs['stderr'] = sp.DEVNULL
    kwargs['stdout'] = sp.DEVNULL
    _old_call(*args, **kwargs)


sp.call = _call_nostderr
# Preallocating the pool of processes.
pool = ProcessPoolExecutor(4)
pool.__enter__()


def interrupt():
    global INTERRUPTING
    INTERRUPTING = True


class FileCleaner:
    def __init__(self, file_lifetime: float = 3600):
        self.file_lifetime = file_lifetime
        self.files = []

    def add(self, path: tp.Union[str, Path]):
        self._cleanup()
        self.files.append((time.time(), Path(path)))

    def _cleanup(self):
        now = time.time()
        for time_added, path in list(self.files):
            if now - time_added > self.file_lifetime:
                if path.exists():
                    path.unlink()
                self.files.pop(0)
            else:
                break


file_cleaner = FileCleaner()

def load_model(version='facebook/musicgen-melody'):
    global MODEL
    print("Loading model", version)
    if MODEL is None or MODEL.name != version:
        del MODEL
        MODEL = None  # in case loading would crash
        MODEL = MusicGen.get_pretrained(version)


def load_diffusion():
    global MBD
    if MBD is None:
        print("loading MBD")
        MBD = MultiBandDiffusion.get_mbd_musicgen()


def _do_predictions(texts, melodies, duration, progress=False, gradio_progress=None, **gen_kwargs):
    MODEL.set_generation_params(duration=duration, **gen_kwargs)
    print("new batch", len(texts), texts, [None if m is None else (m[0], m[1].shape) for m in melodies])
    be = time.time()
    processed_melodies = []
    target_sr = 32000
    target_ac = 1
    for melody in melodies:
        if melody is None:
            processed_melodies.append(None)
        else:
            sr, melody = melody[0], torch.from_numpy(melody[1]).to(MODEL.device).float().t()
            if melody.dim() == 1:
                melody = melody[None]
            melody = melody[..., :int(sr * duration)]
            melody = convert_audio(melody, sr, target_sr, target_ac)
            processed_melodies.append(melody)

    try:
        if any(m is not None for m in processed_melodies):
            outputs = MODEL.generate_with_chroma(
                descriptions=texts,
                melody_wavs=processed_melodies,
                melody_sample_rate=target_sr,
                progress=progress,
                return_tokens=USE_DIFFUSION
            )
        else:
            outputs = MODEL.generate(texts, progress=progress, return_tokens=USE_DIFFUSION)
    except RuntimeError as e:
        raise gr.Error("Error while generating " + e.args[0])
    if USE_DIFFUSION:
        if gradio_progress is not None:
            gradio_progress(1, desc='Running MultiBandDiffusion...')
        tokens = outputs[1]
        if isinstance(MODEL.compression_model, InterleaveStereoCompressionModel):
            left, right = MODEL.compression_model.get_left_right_codes(tokens)
            tokens = torch.cat([left, right])
        outputs_diffusion = MBD.tokens_to_wav(tokens)
        if isinstance(MODEL.compression_model, InterleaveStereoCompressionModel):
            assert outputs_diffusion.shape[1] == 1  # output is mono
            outputs_diffusion = rearrange(outputs_diffusion, '(s b) c t -> b (s c) t', s=2)
        outputs = torch.cat([outputs[0], outputs_diffusion], dim=0)
    outputs = outputs.detach().cpu().float()
    out_wavs = []
    for output in outputs:
        with NamedTemporaryFile("wb", suffix=".wav", delete=False) as file:
            audio_write(
                file.name, output, MODEL.sample_rate, strategy="loudness",
                loudness_headroom_db=16, loudness_compressor=True, add_suffix=False)
            out_wavs.append(file.name)
            file_cleaner.add(file.name)

    print("batch finished", len(texts), time.time() - be)
    print("Tempfiles currently stored: ", len(file_cleaner.files))
    return out_wavs


def predict_batched(texts, melodies):
    max_text_length = 512
    texts = [text[:max_text_length] for text in texts]
    load_model('facebook/musicgen-stereo-melody')
    return _do_predictions(texts, melodies, BATCHED_DURATION)


def predict_full(secret_token, model, model_path, decoder, text, melody, duration, topk, topp, temperature, cfg_coef, progress=gr.Progress()):
    if secret_token != SECRET_TOKEN:
        raise gr.Error(
            f'Invalid secret token. Please fork the original space if you want to use it for yourself.')

    print(f"generating {duration} sec of music for prompt: {text}")
    global INTERRUPTING
    global USE_DIFFUSION
    INTERRUPTING = False
    progress(0, desc="Loading model...")
    model_path = model_path.strip()
    if model_path:
        if not Path(model_path).exists():
            raise gr.Error(f"Model path {model_path} doesn't exist.")
        if not Path(model_path).is_dir():
            raise gr.Error(f"Model path {model_path} must be a folder containing "
                           "state_dict.bin and compression_state_dict_.bin.")
        model = model_path
    if temperature < 0:
        raise gr.Error("Temperature must be >= 0.")
    if topk < 0:
        raise gr.Error("Topk must be non-negative.")
    if topp < 0:
        raise gr.Error("Topp must be non-negative.")

    topk = int(topk)
    if decoder == "MultiBand_Diffusion":
        USE_DIFFUSION = True
        progress(0, desc="Loading diffusion model...")
        load_diffusion()
    else:
        USE_DIFFUSION = False
    load_model(model)

    max_generated = 0

    def _progress(generated, to_generate):
        nonlocal max_generated
        max_generated = max(generated, max_generated)
        progress((min(max_generated, to_generate), to_generate))
        if INTERRUPTING:
            raise gr.Error("Interrupted.")
    MODEL.set_custom_progress_callback(_progress)

    wavs = _do_predictions(
        [text], [melody], duration, progress=True,
        top_k=topk, top_p=topp, temperature=temperature, cfg_coef=cfg_coef,
        gradio_progress=progress)

    wav_path = wavs[0]
    if USE_DIFFUSION:
        wav_path = wavs[1]
    wav_base64 = ""
    

    # Convert WAV to MP3
    mp3_path = wav_path.replace(".wav", ".mp3")
    sound = AudioSegment.from_wav(wav_path)
    sound.export(mp3_path, format="mp3")

    # Encode the MP3 file to base64
    mp3_base64 = ""
    with open(mp3_path, "rb") as mp3_file:
        mp3_base64 = base64.b64encode(mp3_file.read()).decode('utf-8')

    # Prepend the appropriate data URI header
    mp3_base64_data_uri = 'data:audio/mp3;base64,' + mp3_base64
    
    return mp3_base64_data_uri

def toggle_audio_src(choice):
    if choice == "mic":
        return gr.update(source="microphone", value=None, label="Microphone")
    else:
        return gr.update(source="upload", value=None, label="File")


def toggle_diffusion(choice):
    if choice == "MultiBand_Diffusion":
        return [gr.update(visible=True)]
    else:
        return [gr.update(visible=False)]


def ui_full():
    with gr.Blocks() as interface:
        gr.Markdown(
            """
            # MusicGen
            This is your private demo for [MusicGen](https://github.com/facebookresearch/audiocraft),
            a simple and controllable model for music generation
            presented at: ["Simple and Controllable Music Generation"](https://huggingface.co/papers/2306.05284)
            """
        )
        with gr.Row():
            with gr.Column():
                with gr.Row():
                    secret_token = gr.Text(
                        label='Secret Token',
                        max_lines=1,
                        placeholder='Enter your secret token'
                    )
                    text = gr.Text(label="Input Text", interactive=True)
                    with gr.Column():
                        radio = gr.Radio(["file", "mic"], value="file",
                                         label="Condition on a melody (optional) File or Mic")
                        melody = gr.Audio(source="upload", type="numpy", label="File",
                                          interactive=True, elem_id="melody-input")
                with gr.Row():
                    submit = gr.Button("Submit")
                    # Adapted from https://github.com/rkfg/audiocraft/blob/long/app.py, MIT license.
                    _ = gr.Button("Interrupt").click(fn=interrupt, queue=False)
                with gr.Row():
                    model = gr.Radio(["facebook/musicgen-melody", "facebook/musicgen-medium", "facebook/musicgen-small",
                                      "facebook/musicgen-large", "facebook/musicgen-melody-large",
                                      "facebook/musicgen-stereo-small", "facebook/musicgen-stereo-medium",
                                      "facebook/musicgen-stereo-melody", "facebook/musicgen-stereo-large",
                                      "facebook/musicgen-stereo-melody-large"],
                                     label="Model", value="facebook/musicgen-stereo-large", interactive=True)
                    model_path = gr.Text(label="Model Path (custom models)")
                with gr.Row():
                    decoder = gr.Radio(["Default", "MultiBand_Diffusion"],
                                       label="Decoder", value="Default", interactive=True)
                with gr.Row():
                    duration = gr.Slider(minimum=1, maximum=600, value=120, label="Duration", interactive=True)
                with gr.Row():
                    topk = gr.Number(label="Top-k", value=250, interactive=True)
                    topp = gr.Number(label="Top-p", value=0, interactive=True)
                    temperature = gr.Number(label="Temperature", value=1.0, interactive=True)
                    cfg_coef = gr.Number(label="Classifier Free Guidance", value=3.0, interactive=True)
            with gr.Column():
                audio_output = gr.Textbox(label="Generated Music (wav)")
        
        submit.click(
            fn=predict_full,
             inputs=[secret_token, model, model_path, decoder, text, melody, duration, topk, topp,
                                                                     temperature, cfg_coef],
            outputs=audio_output,
            api_name="run")

        gr.HTML("""
            <div style="z-index: 100; position: fixed; top: 0px; right: 0px; left: 0px; bottom: 0px; width: 100%; height: 100%; background: white; display: flex; align-items: center; justify-content: center; color: black;">
              <div style="text-align: center; color: black;">
                <p style="color: black;">This space is a REST API to programmatically generate music.</p>
                <p style="color: black;">Interested in using it? All credit is due to the <a href="https://huggingface.co/spaces/facebook/MusicGen" target="_blank">original space</a>, so go on and fork it 🤗</p>
              </div>
        </div>""")

        interface.queue(max_size=12).launch()

logging.basicConfig(level=logging.INFO, stream=sys.stderr)

# Show the interface
# we preload the model to avoid a timeout on the first request
load_model('facebook/musicgen-stereo-large')
ui_full()