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| # Copyright (c) 2023 Amphion. | |
| # | |
| # This source code is licensed under the MIT license found in the | |
| # LICENSE file in the root directory of this source tree. | |
| import numpy as np | |
| import torch | |
| import torch.nn as nn | |
| from torchaudio.models import Conformer | |
| from models.svc.transformer.transformer import PositionalEncoding | |
| from utils.f0 import f0_to_coarse | |
| class ContentEncoder(nn.Module): | |
| def __init__(self, cfg, input_dim, output_dim): | |
| super().__init__() | |
| self.cfg = cfg | |
| assert input_dim != 0 | |
| self.nn = nn.Linear(input_dim, output_dim) | |
| # Introduce conformer or not | |
| if ( | |
| "use_conformer_for_content_features" in cfg | |
| and cfg.use_conformer_for_content_features | |
| ): | |
| self.pos_encoder = PositionalEncoding(input_dim) | |
| self.conformer = Conformer( | |
| input_dim=input_dim, | |
| num_heads=2, | |
| ffn_dim=256, | |
| num_layers=6, | |
| depthwise_conv_kernel_size=3, | |
| ) | |
| else: | |
| self.conformer = None | |
| def forward(self, x, length=None): | |
| # x: (N, seq_len, input_dim) -> (N, seq_len, output_dim) | |
| if self.conformer: | |
| x = self.pos_encoder(x) | |
| x, _ = self.conformer(x, length) | |
| return self.nn(x) | |
| class MelodyEncoder(nn.Module): | |
| def __init__(self, cfg): | |
| super().__init__() | |
| self.cfg = cfg | |
| self.input_dim = self.cfg.input_melody_dim | |
| self.output_dim = self.cfg.output_melody_dim | |
| self.n_bins = self.cfg.n_bins_melody | |
| if self.input_dim != 0: | |
| if self.n_bins == 0: | |
| # Not use quantization | |
| self.nn = nn.Linear(self.input_dim, self.output_dim) | |
| else: | |
| self.f0_min = cfg.f0_min | |
| self.f0_max = cfg.f0_max | |
| self.nn = nn.Embedding( | |
| num_embeddings=self.n_bins, | |
| embedding_dim=self.output_dim, | |
| padding_idx=None, | |
| ) | |
| self.uv_embedding = nn.Embedding(2, self.output_dim) | |
| def forward(self, x, uv=None, length=None): | |
| # x: (B, frame_len) | |
| if self.n_bins == 0: | |
| x = x.unsqueeze(-1) | |
| else: | |
| x = f0_to_coarse(x, self.n_bins, self.f0_min, self.f0_max) | |
| x = self.nn(x) | |
| if self.cfg.use_uv: | |
| uv = self.uv_embedding(uv) | |
| x = x + uv | |
| return x | |
| class LoudnessEncoder(nn.Module): | |
| def __init__(self, cfg): | |
| super().__init__() | |
| self.cfg = cfg | |
| self.input_dim = self.cfg.input_loudness_dim | |
| self.output_dim = self.cfg.output_loudness_dim | |
| self.n_bins = self.cfg.n_bins_loudness | |
| if self.input_dim != 0: | |
| if self.n_bins == 0: | |
| # Not use quantization | |
| self.nn = nn.Linear(self.input_dim, self.output_dim) | |
| else: | |
| # TODO: set empirically now | |
| self.loudness_min = 1e-30 | |
| self.loudness_max = 1.5 | |
| self.energy_bins = nn.Parameter( | |
| torch.exp( | |
| torch.linspace( | |
| np.log(self.loudness_min), | |
| np.log(self.loudness_max), | |
| self.n_bins - 1, | |
| ) | |
| ), | |
| requires_grad=False, | |
| ) | |
| self.nn = nn.Embedding( | |
| num_embeddings=self.n_bins, | |
| embedding_dim=self.output_dim, | |
| padding_idx=None, | |
| ) | |
| def forward(self, x): | |
| # x: (N, frame_len) | |
| if self.n_bins == 0: | |
| x = x.unsqueeze(-1) | |
| else: | |
| x = torch.bucketize(x, self.energy_bins) | |
| return self.nn(x) | |
| class SingerEncoder(nn.Module): | |
| def __init__(self, cfg): | |
| super().__init__() | |
| self.cfg = cfg | |
| self.input_dim = 1 | |
| self.output_dim = self.cfg.output_singer_dim | |
| self.nn = nn.Embedding( | |
| num_embeddings=cfg.singer_table_size, | |
| embedding_dim=self.output_dim, | |
| padding_idx=None, | |
| ) | |
| def forward(self, x): | |
| # x: (N, 1) -> (N, 1, output_dim) | |
| return self.nn(x) | |
| class ConditionEncoder(nn.Module): | |
| def __init__(self, cfg): | |
| super().__init__() | |
| self.cfg = cfg | |
| self.merge_mode = cfg.merge_mode | |
| ### Semantic Features ### | |
| if cfg.use_whisper: | |
| self.whisper_encoder = ContentEncoder( | |
| self.cfg, self.cfg.whisper_dim, self.cfg.content_encoder_dim | |
| ) | |
| if cfg.use_contentvec: | |
| self.contentvec_encoder = ContentEncoder( | |
| self.cfg, self.cfg.contentvec_dim, self.cfg.content_encoder_dim | |
| ) | |
| if cfg.use_mert: | |
| self.mert_encoder = ContentEncoder( | |
| self.cfg, self.cfg.mert_dim, self.cfg.content_encoder_dim | |
| ) | |
| if cfg.use_wenet: | |
| self.wenet_encoder = ContentEncoder( | |
| self.cfg, self.cfg.wenet_dim, self.cfg.content_encoder_dim | |
| ) | |
| ### Prosody Features ### | |
| if cfg.use_f0: | |
| self.melody_encoder = MelodyEncoder(self.cfg) | |
| if cfg.use_energy: | |
| self.loudness_encoder = LoudnessEncoder(self.cfg) | |
| ### Speaker Features ### | |
| if cfg.use_spkid: | |
| self.singer_encoder = SingerEncoder(self.cfg) | |
| def forward(self, x): | |
| outputs = [] | |
| if self.cfg.use_f0: | |
| if self.cfg.use_uv: | |
| pitch_enc_out = self.melody_encoder( | |
| x["frame_pitch"], uv=x["frame_uv"], length=x["target_len"] | |
| ) | |
| else: | |
| pitch_enc_out = self.melody_encoder( | |
| x["frame_pitch"], uv=None, length=x["target_len"] | |
| ) | |
| outputs.append(pitch_enc_out) | |
| if self.cfg.use_energy: | |
| loudness_enc_out = self.loudness_encoder(x["frame_energy"]) | |
| outputs.append(loudness_enc_out) | |
| if self.cfg.use_whisper: | |
| # whisper_feat: [b, T, 1024] | |
| whiser_enc_out = self.whisper_encoder( | |
| x["whisper_feat"], length=x["target_len"] | |
| ) | |
| outputs.append(whiser_enc_out) | |
| seq_len = whiser_enc_out.shape[1] | |
| if self.cfg.use_contentvec: | |
| contentvec_enc_out = self.contentvec_encoder( | |
| x["contentvec_feat"], length=x["target_len"] | |
| ) | |
| outputs.append(contentvec_enc_out) | |
| seq_len = contentvec_enc_out.shape[1] | |
| if self.cfg.use_mert: | |
| mert_enc_out = self.mert_encoder(x["mert_feat"], length=x["target_len"]) | |
| outputs.append(mert_enc_out) | |
| seq_len = mert_enc_out.shape[1] | |
| if self.cfg.use_wenet: | |
| wenet_enc_out = self.wenet_encoder(x["wenet_feat"], length=x["target_len"]) | |
| outputs.append(wenet_enc_out) | |
| seq_len = wenet_enc_out.shape[1] | |
| if self.cfg.use_spkid: | |
| speaker_enc_out = self.singer_encoder(x["spk_id"]) # [b, 1, 384] | |
| assert ( | |
| "whisper_feat" in x.keys() | |
| or "contentvec_feat" in x.keys() | |
| or "mert_feat" in x.keys() | |
| or "wenet_feat" in x.keys() | |
| ) | |
| singer_info = speaker_enc_out.expand(-1, seq_len, -1) | |
| outputs.append(singer_info) | |
| encoder_output = None | |
| if self.merge_mode == "concat": | |
| encoder_output = torch.cat(outputs, dim=-1) | |
| if self.merge_mode == "add": | |
| # (#modules, N, seq_len, output_dim) | |
| outputs = torch.cat([out[None, :, :, :] for out in outputs], dim=0) | |
| # (N, seq_len, output_dim) | |
| encoder_output = torch.sum(outputs, dim=0) | |
| return encoder_output | |