78 lines
3.4 KiB
Python
78 lines
3.4 KiB
Python
import os
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import random
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import torch
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from data.audio.unsupervised_audio_dataset import load_audio
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from data.util import find_files_of_type, is_audio_file
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from models.diffusion.gaussian_diffusion import get_named_beta_schedule
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from models.diffusion.respace import SpacedDiffusion, space_timesteps
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from trainer.injectors.base_injectors import TorchMelSpectrogramInjector
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from utils.audio import plot_spectrogram
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def wav_to_mel(wav, mel_norms_file='../experiments/clips_mel_norms.pth'):
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"""
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Converts an audio clip into a MEL tensor that the vocoder, DVAE and GptTts models use whenever a MEL is called for.
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"""
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return TorchMelSpectrogramInjector({'in': 'wav', 'out': 'mel', 'mel_norm_file': mel_norms_file},{})({'wav': wav})['mel']
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def convert_mel_to_codes(dvae_model, mel):
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"""
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Converts an audio clip into discrete codes.
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"""
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dvae_model.eval()
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with torch.no_grad():
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return dvae_model.get_codebook_indices(mel)
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def load_gpt_conditioning_inputs_from_directory(path, num_candidates=3, sample_rate=22050, max_samples=44100):
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candidates = find_files_of_type('img', os.path.dirname(path), qualifier=is_audio_file)[0]
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assert len(candidates) < 50000 # Sanity check to ensure we aren't loading "related files" that aren't actually related.
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if len(candidates) == 0:
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print(f"No conditioning candidates found for {path} (not even the clip itself??)")
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raise NotImplementedError()
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# Sample with replacement. This can get repeats, but more conveniently handles situations where there are not enough candidates.
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related_mels = []
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for k in range(num_candidates):
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rel_clip = load_audio(random.choice(candidates), sample_rate)
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gap = rel_clip.shape[-1] - max_samples
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if gap > 0:
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rand_start = random.randint(0, gap)
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rel_clip = rel_clip[:, rand_start:rand_start+max_samples]
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as_mel = wav_to_mel(rel_clip)
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related_mels.append(as_mel)
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return torch.stack(related_mels, dim=0)
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def load_discrete_vocoder_diffuser(trained_diffusion_steps=4000, desired_diffusion_steps=200):
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"""
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Helper function to load a GaussianDiffusion instance configured for use as a vocoder.
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"""
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return SpacedDiffusion(use_timesteps=space_timesteps(trained_diffusion_steps, [desired_diffusion_steps]), model_mean_type='epsilon',
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model_var_type='learned_range', loss_type='mse', betas=get_named_beta_schedule('linear', trained_diffusion_steps))
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def do_spectrogram_diffusion(diffusion_model, dvae_model, diffuser, mel_codes, conditioning_input, spectrogram_compression_factor=128, plt_spec=False):
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"""
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Uses the specified diffusion model and DVAE model to convert the provided MEL & conditioning inputs into an audio clip.
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"""
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diffusion_model.eval()
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dvae_model.eval()
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with torch.no_grad():
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mel = dvae_model.decode(mel_codes)[0]
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if plt_spec:
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plot_spectrogram(mel[0].cpu())
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# Pad MEL to multiples of 2048//spectrogram_compression_factor
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msl = mel.shape[-1]
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dsl = 2048 // spectrogram_compression_factor
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gap = dsl - (msl % dsl)
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if gap > 0:
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mel = torch.nn.functional.pad(mel, (0, gap))
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output_shape = (mel.shape[0], 1, mel.shape[-1] * spectrogram_compression_factor)
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return diffuser.p_sample_loop(diffusion_model, output_shape, model_kwargs={'spectrogram': mel, 'conditioning_input': conditioning_input})
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