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| from typing import Iterable, Tuple | |
| import torch | |
| import numpy as np | |
| from PIL import Image | |
| from tqdm.auto import tqdm | |
| from librosa.beat import beat_track | |
| from diffusers import DDPMPipeline, DDPMScheduler | |
| from .mel import Mel | |
| VERSION = "1.1.3" | |
| class AudioDiffusion: | |
| def __init__(self, | |
| model_id: str = "teticio/audio-diffusion-256", | |
| resolution: int = 256, | |
| cuda: bool = torch.cuda.is_available(), | |
| progress_bar: Iterable = tqdm): | |
| """Class for generating audio using Denoising Diffusion Probabilistic Models. | |
| Args: | |
| model_id (String): name of model (local directory or Hugging Face Hub) | |
| resolution (int): size of square mel spectrogram in pixels | |
| cuda (bool): use CUDA? | |
| progress_bar (iterable): iterable callback for progress updates or None | |
| """ | |
| self.mel = Mel(x_res=resolution, y_res=resolution) | |
| self.model_id = model_id | |
| self.ddpm = DDPMPipeline.from_pretrained(self.model_id) | |
| if cuda: | |
| self.ddpm.to("cuda") | |
| self.progress_bar = progress_bar or (lambda _: _) | |
| def generate_spectrogram_and_audio( | |
| self, | |
| generator: torch.Generator = None | |
| ) -> Tuple[Image.Image, Tuple[int, np.ndarray]]: | |
| """Generate random mel spectrogram and convert to audio. | |
| Args: | |
| generator (torch.Generator): random number generator or None | |
| Returns: | |
| PIL Image: mel spectrogram | |
| (float, np.ndarray): sample rate and raw audio | |
| """ | |
| images = self.ddpm(output_type="numpy", generator=generator)["sample"] | |
| images = (images * 255).round().astype("uint8").transpose(0, 3, 1, 2) | |
| image = Image.fromarray(images[0][0]) | |
| audio = self.mel.image_to_audio(image) | |
| return image, (self.mel.get_sample_rate(), audio) | |
| def generate_spectrogram_and_audio_from_audio( | |
| self, | |
| audio_file: str = None, | |
| raw_audio: np.ndarray = None, | |
| slice: int = 0, | |
| start_step: int = 0, | |
| steps: int = None, | |
| generator: torch.Generator = None | |
| ) -> Tuple[Image.Image, Tuple[int, np.ndarray]]: | |
| """Generate random mel spectrogram from audio input and convert to audio. | |
| Args: | |
| audio_file (str): must be a file on disk due to Librosa limitation or | |
| raw_audio (np.ndarray): audio as numpy array | |
| slice (int): slice number of audio to convert | |
| start_step (int): step to start from | |
| steps (int): number of de-noising steps to perform (defaults to num_train_timesteps) | |
| generator (torch.Generator): random number generator or None | |
| Returns: | |
| PIL Image: mel spectrogram | |
| (float, np.ndarray): sample rate and raw audio | |
| """ | |
| # It would be better to derive a class from DDPMDiffusionPipeline | |
| # but currently the return type ImagePipelineOutput cannot be imported. | |
| if steps is None: | |
| steps = self.ddpm.scheduler.num_train_timesteps | |
| scheduler = DDPMScheduler(num_train_timesteps=steps) | |
| scheduler.set_timesteps(steps) | |
| images = torch.randn( | |
| (1, self.ddpm.unet.in_channels, self.ddpm.unet.sample_size, | |
| self.ddpm.unet.sample_size), | |
| generator=generator, | |
| ) | |
| if audio_file is not None or raw_audio is not None: | |
| self.mel.load_audio(audio_file, raw_audio) | |
| input_image = self.mel.audio_slice_to_image(slice) | |
| input_image = np.frombuffer(input_image.tobytes(), | |
| dtype="uint8").reshape( | |
| (input_image.width, | |
| input_image.height)) | |
| input_image = ((input_image / 255) * 2 - 1) | |
| if start_step > 0: | |
| images[0][0] = scheduler.add_noise( | |
| torch.tensor(input_image[np.newaxis, np.newaxis, :]), | |
| images, steps - start_step) | |
| images = images.to(self.ddpm.device) | |
| for t in self.progress_bar(scheduler.timesteps[start_step:]): | |
| model_output = self.ddpm.unet(images, t)['sample'] | |
| images = scheduler.step(model_output, | |
| t, | |
| images, | |
| generator=generator)['prev_sample'] | |
| images = (images / 2 + 0.5).clamp(0, 1) | |
| images = images.cpu().permute(0, 2, 3, 1).numpy() | |
| images = (images * 255).round().astype("uint8").transpose(0, 3, 1, 2) | |
| image = Image.fromarray(images[0][0]) | |
| audio = self.mel.image_to_audio(image) | |
| return image, (self.mel.get_sample_rate(), audio) | |
| def loop_it(audio: np.ndarray, | |
| sample_rate: int, | |
| loops: int = 12) -> np.ndarray: | |
| """Loop audio | |
| Args: | |
| audio (np.ndarray): audio as numpy array | |
| sample_rate (int): sample rate of audio | |
| loops (int): number of times to loop | |
| Returns: | |
| (float, np.ndarray): sample rate and raw audio or None | |
| """ | |
| _, beats = beat_track(y=audio, sr=sample_rate, units='samples') | |
| for beats_in_bar in [16, 12, 8, 4]: | |
| if len(beats) > beats_in_bar: | |
| return np.tile(audio[beats[0]:beats[beats_in_bar]], loops) | |
| return None | |