UPDATE add audio edit function

TTS/tts/models/xtts.py

@@ -691,6 +691,180 @@ def inference_stream(
                     last_tokens = []
                     yield wav_chunk
 
+    def init_for_audio_edit(self, dvae_checkpoint, mel_norm_file):
+        from TTS.tts.layers.xtts.dvae import DiscreteVAE
+        from TTS.tts.layers.tortoise.arch_utils import TorchMelSpectrogram
+
+        dvae_sample_rate: int = 22050
+
+        # Load DVAE
+        self.dvae = DiscreteVAE(
+            channels=80,
+            normalization=None,
+            positional_dims=1,
+            num_tokens=self.args.gpt_num_audio_tokens - 2,
+            codebook_dim=512,
+            hidden_dim=512,
+            num_resnet_blocks=3,
+            kernel_size=3,
+            num_layers=2,
+            use_transposed_convs=False,
+        )
+
+        self.dvae.eval()
+        dvae_dict = torch.load(dvae_checkpoint, map_location=torch.device("cpu"))
+        self.dvae.load_state_dict(dvae_dict, strict=False)
+        print(">> DVAE weights restored from:", dvae_checkpoint)
+
+        # Mel spectrogram extractor for DVAE
+        self.torch_mel_spectrogram_dvae = TorchMelSpectrogram(
+            mel_norm_file=mel_norm_file, sampling_rate=dvae_sample_rate
+        )
+
+        self.dvae = self.dvae.to(self.device)
+        self.torch_mel_spectrogram_dvae = self.torch_mel_spectrogram_dvae.to(self.device)
+
+    @torch.inference_mode()
+    def audio_edit(
+        self,
+        text_left,
+        text_edit,
+        text_right,
+        audio_left_path,
+        audio_right_path,
+        language,
+        gpt_cond_latent,
+        speaker_embedding,
+        generate_times=5,
+        # GPT inference
+        temperature=0.75,
+        length_penalty=1.0,
+        repetition_penalty=10.0,
+        top_k=50,
+        top_p=0.85,
+        do_sample=True,
+        num_beams=1,
+        speed=1.0,
+        enable_text_splitting=False,
+        **hf_generate_kwargs,):
+
+        load_sr: int = 22050
+        audio_left = load_audio(audio_left_path, load_sr)
+        audio_left = audio_left.to(self.device)
+        audio_right = load_audio(audio_right_path, load_sr)
+        audio_right = audio_right.to(self.device)
+
+        dvae_mel_spec_left = self.torch_mel_spectrogram_dvae(audio_left)
+        codes_left = self.dvae.get_codebook_indices(dvae_mel_spec_left)
+        dvae_mel_spec_right = self.torch_mel_spectrogram_dvae(audio_right)
+        codes_right = self.dvae.get_codebook_indices(dvae_mel_spec_right)
+
+        language = language.split("-")[0]  # remove the country code
+        length_scale = 1.0 / max(speed, 0.05)
+        gpt_cond_latent = gpt_cond_latent.to(self.device)
+        speaker_embedding = speaker_embedding.to(self.device)
+
+        wavs = []
+        with torch.no_grad():
+            sent = text_left + text_edit
+            sent = sent.strip().lower()
+            text_tokens = torch.IntTensor(self.tokenizer.encode(sent, lang=language)).unsqueeze(0).to(self.device)
+
+            sent_left = text_left.strip().lower()
+            text_left_tokens = torch.IntTensor(self.tokenizer.encode(sent_left, lang=language)).unsqueeze(0).to(self.device)
+
+            sent_right = text_edit + text_right
+            sent_right = sent_right.strip().lower()
+            text_right_tokens = torch.IntTensor(self.tokenizer.encode(sent_right, lang=language)).unsqueeze(0).to(self.device)
+
+            assert (
+                    text_tokens.shape[-1] < self.args.gpt_max_text_tokens
+            ), " ❗ XTTS can only generate text with a maximum of 400 tokens."
+
+            gpt_inputs = self.gpt.compute_embeddings(gpt_cond_latent, text_tokens)
+            # add codes_left to inputs
+            gpt_inputs = torch.cat([gpt_inputs, codes_left], dim=1)
+
+            best_gpt_latents = None
+            best_logits = 0
+            for _ in range(generate_times):
+                gen = self.gpt.gpt_inference.generate(
+                    gpt_inputs,
+                    bos_token_id=self.gpt.start_audio_token,
+                    pad_token_id=self.gpt.stop_audio_token,
+                    eos_token_id=self.gpt.stop_audio_token,
+                    max_length=self.gpt.max_gen_mel_tokens + gpt_inputs.shape[-1],
+                    do_sample=do_sample,
+                    top_p=top_p,
+                    top_k=top_k,
+                    temperature=temperature,
+                    num_return_sequences=self.gpt_batch_size,
+                    num_beams=num_beams,
+                    length_penalty=length_penalty,
+                    repetition_penalty=repetition_penalty,
+                    output_attentions=False,
+                    **hf_generate_kwargs,
+                )
+                gpt_codes = gen[:, gpt_inputs.shape[1]: -1]
+
+                gen_len = gpt_codes.shape[-1]
+
+                gpt_right_codes = torch.cat([gpt_codes, codes_right], dim=1)
+                expected_output_len = torch.tensor(
+                    [gpt_right_codes.shape[-1] * self.gpt.code_stride_len], device=text_right_tokens.device
+                )
+                text_len = torch.tensor([text_right_tokens.shape[-1]], device=self.device)
+
+                gpt_latents = self.gpt(
+                    text_right_tokens,
+                    text_len,
+                    gpt_right_codes,
+                    expected_output_len,
+                    cond_latents=gpt_cond_latent,
+                    return_attentions=False,
+                    return_latent=True,
+                )
+
+                right_logits = torch.gather(F.softmax(gpt_latents[:, gen_len:], dim=-1),
+                                            -1,
+                                            codes_right.unsqueeze(0).transpose(-1, -2))
+                sum_logits = torch.sum(right_logits, dim=-2)
+                sum_logits = float(sum_logits[0,0])
+
+                if sum_logits > best_logits:
+                    best_logits = sum_logits
+                    best_gpt_latents = gpt_latents.detach()
+
+
+            expected_left_len = torch.tensor(
+                [codes_left.shape[-1] * self.gpt.code_stride_len], device=text_left_tokens.device
+            )
+            text_left_len = torch.tensor([text_left_tokens.shape[-1]], device=self.device)
+            gpt_left_latents = self.gpt(
+                text_left_tokens,
+                text_left_len,
+                codes_left,
+                expected_left_len,
+                cond_latents=gpt_cond_latent,
+                return_attentions=False,
+                return_latent=True,
+            )
+
+            # if length_scale != 1.0:
+            #     best_gpt_latents = F.interpolate(
+            #         best_gpt_latents.transpose(1, 2), scale_factor=length_scale, mode="linear"
+            #     ).transpose(1, 2)
+
+            # wavs.append(load_audio(audio_left_path, self.args.output_sample_rate).cpu().squeeze())
+            # wavs.append(self.hifigan_decoder(best_gpt_latents, g=speaker_embedding).cpu().squeeze())
+            # wavs.append(load_audio(audio_right_path, self.args.output_sample_rate).cpu().squeeze())
+            wavs.append(self.hifigan_decoder(torch.cat([gpt_left_latents, best_gpt_latents], dim=1),
+                                             g=speaker_embedding).cpu().squeeze())
+
+        return {
+            "wav": torch.cat(wavs, dim=0).numpy(),
+        }
+
     def forward(self):
         raise NotImplementedError(
             "XTTS has a dedicated trainer, please check the XTTS docs: https://tts.readthedocs.io/en/dev/models/xtts.html#training"