diff --git a/ChatTTS/core.py b/ChatTTS/core.py
index f6c7f5aeb..3715f6970 100644
--- a/ChatTTS/core.py
+++ b/ChatTTS/core.py
@@ -2,7 +2,7 @@
 import logging
 import tempfile
 from dataclasses import dataclass, asdict
-from typing import Literal, Optional, List, Tuple, Dict
+from typing import Literal, Optional, List, Tuple, Dict, Union
 from json import load
 from pathlib import Path
 import lzma
@@ -10,7 +10,6 @@
 import numpy as np
 import torch
 import torch.nn.functional as F
-from omegaconf import OmegaConf
 from vocos import Vocos
 from vocos.pretrained import instantiate_class
 from huggingface_hub import snapshot_download
@@ -161,6 +160,28 @@ def unload(self):
     def sample_random_speaker(self) -> str:
         return self._encode_spk_emb(self._sample_random_speaker())
 
+    @torch.inference_mode()
+    def sample_audio_speaker(self, wav: Union[np.ndarray, torch.Tensor]) -> str:
+        if isinstance(wav, np.ndarray):
+            wav = torch.from_numpy(wav)
+        return self._encode_prompt(self.dvae(wav, "encode").squeeze_(0))
+
+    @staticmethod
+    @torch.no_grad()
+    def _encode_prompt(prompt: torch.Tensor) -> str:
+        arr: np.ndarray = prompt.to(dtype=torch.uint16, device="cpu").numpy()
+        shp = arr.shape
+        assert len(shp) == 2, "prompt must be a 2D tensor"
+        s = b14.encode_to_string(
+            np.array(shp, dtype="<u2").tobytes() + lzma.compress(
+                arr.astype("<u2").tobytes(),
+                format=lzma.FORMAT_RAW,
+                filters=[{"id": lzma.FILTER_LZMA2, "preset": 9 | lzma.PRESET_EXTREME}],
+            ),
+        )
+        del arr
+        return s
+
     @staticmethod
     @torch.no_grad()
     def _encode_spk_emb(spk_emb: torch.Tensor) -> str:
@@ -201,6 +222,7 @@ class RefineTextParams:
     class InferCodeParams(RefineTextParams):
         prompt: str = "[speed_5]"
         spk_emb: Optional[str] = None
+        sample: Optional[str]=None
         temperature: float = 0.3
         repetition_penalty: float = 1.05
         max_new_token: int = 2048
@@ -459,6 +481,22 @@ def _decode_to_wavs(
         del mel_specs
         return wavs
 
+    @staticmethod
+    @torch.no_grad()
+    def _decode_prompt(prompt: str) -> torch.Tensor:
+        dec = b14.decode_from_string(prompt)
+        shp = np.frombuffer(dec[:4], dtype="<u2")
+        p = np.frombuffer(
+            lzma.decompress(
+                dec[4:],
+                format=lzma.FORMAT_RAW,
+                filters=[{"id": lzma.FILTER_LZMA2, "preset": 9 | lzma.PRESET_EXTREME}],
+            ),
+            dtype="<u2",
+        ).copy()
+        del dec
+        return torch.from_numpy(p).view(*shp)
+
     @staticmethod
     def _decode_spk_emb(spk_emb: str) -> np.ndarray:
         return np.frombuffer(
@@ -540,7 +578,10 @@ def _infer_code(
             text = [f"[Stts][empty_spk]{i}[Ptts]" for i in text]
 
         input_ids, attention_mask, text_mask = self.tokenizer.encode(
-            text, self.gpt.num_vq, gpt.device_gpt
+            text,
+            self.gpt.num_vq,
+            prompt=self._decode_prompt(params.sample) if params.sample is not None else None,
+            device=gpt.device_gpt,
         )
 
         emb = gpt(input_ids, text_mask)
@@ -600,7 +641,7 @@ def _refine_text(
         text = [f"[Sbreak]{i}[Pbreak]{params.prompt}" for i in text]
 
         input_ids, attention_mask, text_mask = self.tokenizer.encode(
-            text, self.gpt.num_vq, gpt.device_gpt
+            text, self.gpt.num_vq, device=gpt.device_gpt,
         )
 
         logits_warpers, logits_processors = gen_logits(
diff --git a/ChatTTS/model/dvae.py b/ChatTTS/model/dvae.py
index a5cb5a0fc..ff00980d8 100644
--- a/ChatTTS/model/dvae.py
+++ b/ChatTTS/model/dvae.py
@@ -95,17 +95,14 @@ def _embed(self, x: torch.Tensor):
         feat = self.quantizer.get_output_from_indices(x)
         return feat.transpose_(1, 2) if self.transpose else feat
 
-    def __call__(
-        self, x: torch.Tensor
-    ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor, torch.Tensor]:
+    def __call__(self, x: torch.Tensor) -> torch.Tensor:
         return super().__call__(x)
 
-    def forward(
-        self, x: torch.Tensor
-    ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor, torch.Tensor]:
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
         if self.transpose:
             x.transpose_(1, 2)
-        feat, ind = self.quantizer(x)
+        # feat, ind = self.quantizer(x)
+        _, ind = self.quantizer(x)
         """
         ind = rearrange(
             ind, "g b t r ->b t (g r)",
@@ -113,6 +110,7 @@ def forward(
         """
         ind = ind.permute(1, 2, 0, 3).contiguous()
         ind = ind.view(ind.size(0), ind.size(1), -1)
+        """
         embed_onehot_tmp = F.one_hot(ind.long(), self.n_ind)
         embed_onehot = embed_onehot_tmp.to(x.dtype)
         del embed_onehot_tmp
@@ -121,12 +119,12 @@ def forward(
         torch.div(e_mean, (e_mean.sum(dim=1) + self.eps).unsqueeze(1), out=e_mean)
         perplexity = torch.exp(-torch.sum(e_mean * torch.log(e_mean + self.eps), dim=1))
 
-        return (
+        return 
             torch.zeros(perplexity.shape, dtype=x.dtype, device=x.device),
             feat.transpose_(1, 2) if self.transpose else feat,
             perplexity,
-            ind.transpose_(1, 2) if self.transpose else ind,
-        )
+        """
+        return ind.transpose_(1, 2) if self.transpose else ind
 
 
 class DVAEDecoder(nn.Module):
@@ -255,9 +253,13 @@ def forward(
     ) -> torch.Tensor:
         if mode == "encode" and hasattr(self, "encoder") and self.vq_layer is not None:
             mel = self.preprocessor_mel(inp)
-            x: torch.Tensor = self.downsample_conv(mel / self.coef)
+            x: torch.Tensor = self.downsample_conv(
+                torch.div(mel, self.coef.view(100, 1).expand(mel.shape), out=mel),
+            ).unsqueeze_(0)
+            del mel
             x = self.encoder(x)
-            ind = self.vq_layer(x)[3]
+            ind = self.vq_layer(x)
+            del x
             return ind
 
         if self.vq_layer is not None:
diff --git a/ChatTTS/model/tokenizer.py b/ChatTTS/model/tokenizer.py
index c90e71236..d949fc713 100644
--- a/ChatTTS/model/tokenizer.py
+++ b/ChatTTS/model/tokenizer.py
@@ -5,7 +5,7 @@
 https://stackoverflow.com/questions/62691279/how-to-disable-tokenizers-parallelism-true-false-warning
 """
 
-from typing import List, Tuple
+from typing import List, Tuple, Optional
 
 import torch
 from transformers import BertTokenizerFast
@@ -31,13 +31,19 @@ def __init__(
 
     @torch.inference_mode()
     def encode(
-        self, text: List[str], num_vq: int, device="cpu"
+        self, text: List[str], num_vq: int, prompt: Optional[torch.Tensor]=None, device="cpu",
     ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
 
         input_ids_lst = []
         attention_mask_lst = []
         max_input_ids_len = -1
         max_attention_mask_len = -1
+        prompt_size = 0
+
+        if prompt is not None:
+            assert prompt.size(0) == num_vq, "prompt dim 0 must equal to num_vq"
+            prompt_size = prompt.size(1)
+
         # avoid random speaker embedding of tokenizer in the other dims
         for t in text:
             x = self._tokenizer.encode_plus(
@@ -52,6 +58,11 @@ def encode(
             attn_sz = attention_mask_lst[-1].size(0)
             if attn_sz > max_attention_mask_len:
                 max_attention_mask_len = attn_sz
+
+        if prompt is not None:
+            max_input_ids_len += prompt_size
+            max_attention_mask_len += prompt_size
+
         input_ids = torch.zeros(
             len(input_ids_lst),
             max_input_ids_len,
@@ -59,10 +70,13 @@ def encode(
             dtype=input_ids_lst[0].dtype,
         )
         for i in range(len(input_ids_lst)):
-            input_ids.narrow(0, i, 1).narrow(1, 0, input_ids_lst[i].size(0)).copy_(
-                input_ids_lst[i]
-            )
+            input_ids.narrow(0, i, 1).narrow(
+                1,
+                max_input_ids_len-prompt_size-input_ids_lst[i].size(0),
+                input_ids_lst[i].size(0),
+            ).copy_(input_ids_lst[i]) # left padding
         del_all(input_ids_lst)
+
         attention_mask = torch.zeros(
             len(attention_mask_lst),
             max_attention_mask_len,
@@ -70,12 +84,29 @@ def encode(
             dtype=attention_mask_lst[0].dtype,
         )
         for i in range(len(attention_mask_lst)):
-            attention_mask.narrow(0, i, 1).narrow(
-                1, 0, attention_mask_lst[i].size(0)
-            ).copy_(attention_mask_lst[i])
+            attn = attention_mask.narrow(0, i, 1)
+            attn.narrow(
+                1,
+                max_attention_mask_len-prompt_size-attention_mask_lst[i].size(0),
+                attention_mask_lst[i].size(0),
+            ).copy_(attention_mask_lst[i]) # left padding
+            if prompt_size > 0:
+                attn.narrow(
+                    1, max_attention_mask_len-prompt_size, prompt_size,
+                ).fill_(1)
         del_all(attention_mask_lst)
 
         text_mask = torch.ones(input_ids.shape, dtype=bool, device=device)
-        input_ids = input_ids.unsqueeze_(-1).expand(-1, -1, num_vq)
+        new_input_ids = input_ids.unsqueeze_(-1).expand(-1, -1, num_vq).clone()
+
+        if prompt_size > 0:
+            text_mask.narrow(1, max_input_ids_len-prompt_size, prompt_size).fill_(0)
+            prompt_t = prompt.t().unsqueeze_(0).expand(input_ids.size(0), -1, -1)
+            new_input_ids.narrow(
+                1,
+                max_input_ids_len-prompt_size,
+                prompt_size,
+            ).copy_(prompt_t)
+            del prompt_t
 
-        return input_ids, attention_mask, text_mask
+        return new_input_ids, attention_mask, text_mask
diff --git a/requirements.txt b/requirements.txt
index 7578f4273..75066bb96 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,5 @@
 numpy<2.0.0
 numba
-omegaconf>=2.3.0
 torch>=2.1.0
 torchaudio
 tqdm
diff --git a/setup.py b/setup.py
index 7c47b4ba5..da7b609e6 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,6 @@
     install_requires=[
         "numba",
         "numpy<2.0.0",
-        "omegaconf>=2.3.0",
         "pybase16384",
         "torch>=2.1.0",
         "torchaudio",