import asyncio import base64 import json import math import os import re import time from pathlib import Path from typing import Any import numpy as np from fastapi import Request, UploadFile from fastapi.responses import Response, StreamingResponse from transformers.utils.hub import cached_file from vllm.entrypoints.openai.engine.serving import OpenAIServing from vllm.logger import init_logger from vllm.multimodal.media import MediaConnector from vllm.utils import random_uuid from vllm_omni.entrypoints.openai.audio_utils_mixin import AudioMixin from vllm_omni.entrypoints.openai.metadata_manager import MetadataManager from vllm_omni.entrypoints.openai.protocol.audio import ( CreateAudio, OpenAICreateSpeechRequest, ) from vllm_omni.outputs import OmniRequestOutput logger = init_logger(__name__) # TTS Configuration (currently supports Qwen3-TTS) _TTS_MODEL_STAGES: set[str] = {"qwen3_tts"} _TTS_LANGUAGES: set[str] = { "Auto", "Chinese", "English", "Japanese", "Korean", "German", "French", "Russian", "Portuguese", "Spanish", "Italian", } _TTS_MAX_INSTRUCTIONS_LENGTH = 500 _TTS_MAX_NEW_TOKENS_MIN = 1 _TTS_MAX_NEW_TOKENS_MAX = 4096 def _sanitize_filename(filename: str) -> str: """Sanitize filename to prevent path traversal attacks. Only allows alphanumeric characters, underscores, hyphens, and dots. Replaces any other characters with underscores. """ # Remove any path components filename = os.path.basename(filename) # Replace any non-alphanumeric, underscore, hyphen, or dot with underscore sanitized = re.sub(r"[^a-zA-Z0-9_.\-]", "_", filename) # Ensure filename is not empty if not sanitized: sanitized = "file" # Limit length to prevent potential issues if len(sanitized) > 255: sanitized = sanitized[:255] return sanitized def _validate_path_within_directory(file_path: Path, directory: Path) -> bool: """Validate that file_path is within the specified directory. Prevents path traversal attacks by ensuring the resolved path is within the target directory. """ try: # Resolve both paths to absolute paths file_path_resolved = file_path.resolve() directory_resolved = directory.resolve() # Check if file_path is within directory return directory_resolved in file_path_resolved.parents or directory_resolved == file_path_resolved except Exception: return False class OmniOpenAIServingSpeech(OpenAIServing, AudioMixin): def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) # Initialize uploaded speakers storage speech_voice_samples_dir = os.environ.get("SPEECH_VOICE_SAMPLES", "/tmp/voice_samples") self.uploaded_speakers_dir = Path(speech_voice_samples_dir) self.uploaded_speakers_dir.mkdir(parents=True, exist_ok=True) self.metadata_file = self.uploaded_speakers_dir / "metadata.json" # Initialize metadata manager self.metadata_manager = MetadataManager(self.metadata_file) # Find and cache the TTS stage (if any) during initialization self._tts_stage = self._find_tts_stage() self._is_tts = self._tts_stage is not None # Cache TTS configuration values (computed once, reused per request) self._max_instructions_length = self._compute_max_instructions_length() # Load supported speakers self.supported_speakers = self._load_supported_speakers() # Load uploaded speakers self.uploaded_speakers = self.metadata_manager.get_uploaded_speakers() # Merge supported speakers with uploaded speakers self.supported_speakers.update(self.uploaded_speakers.keys()) self._tts_tokenizer = None logger.info(f"Loaded {len(self.supported_speakers)} supported speakers: {sorted(self.supported_speakers)}") logger.info(f"Loaded {len(self.uploaded_speakers)} uploaded speakers") # Load speech tokenizer codec parameters for prompt length estimation self._codec_frame_rate: float | None = self._load_codec_frame_rate() def _load_codec_frame_rate(self) -> float | None: """Load codec frame rate from speech tokenizer config for prompt length estimation.""" try: model_path = self.engine_client.model_config.model st_config_path = os.path.join(model_path, "speech_tokenizer", "config.json") if not os.path.exists(st_config_path): st_config_path = cached_file(model_path, "speech_tokenizer/config.json") if st_config_path is not None and os.path.exists(st_config_path): with open(st_config_path) as f: st_config = json.load(f) output_sr = st_config.get("output_sample_rate") downsample = st_config.get("encode_downsample_rate") if output_sr and downsample and downsample > 0: rate = float(output_sr) / float(downsample) logger.info( f"Loaded codec frame rate: {rate:.1f} Hz " f"(output_sample_rate={output_sr}, encode_downsample_rate={downsample})" ) return rate except Exception as e: logger.warning(f"Failed to load codec frame rate from speech tokenizer config: {e}") # Fallback: try codec_frame_rate_hz from hf_config try: hf_config = self.engine_client.model_config.hf_config rate = getattr(hf_config, "codec_frame_rate_hz", None) if rate is not None: logger.info(f"Using codec frame rate from hf_config: {rate} Hz") return float(rate) except Exception: pass return None def _find_tts_stage(self): """Find and return the TTS stage from the stage list, or None if not found.""" stage_list = getattr(self.engine_client, "stage_list", None) if stage_list is None: return None for stage in stage_list: if getattr(stage, "model_stage", None) in _TTS_MODEL_STAGES: return stage return None def _compute_max_instructions_length(self) -> int: """Compute max instructions length with precedence: CLI > stage config > default. Called once during initialization; result is cached in self._max_instructions_length. """ # 1. CLI override takes highest priority (stored in engine_client) cli_override = getattr(self.engine_client, "tts_max_instructions_length", None) if cli_override is not None: return cli_override # 2. Try to get from TTS stage config if self._tts_stage is not None: tts_args = getattr(self._tts_stage, "tts_args", {}) if "max_instructions_length" in tts_args: return tts_args["max_instructions_length"] # 3. Default fallback return _TTS_MAX_INSTRUCTIONS_LENGTH def _load_supported_speakers(self) -> set[str]: """Load supported speakers (case-insensitive) from the model configuration.""" try: talker_config = self.engine_client.model_config.hf_config.talker_config # Check for speakers in either spk_id or speaker_id for attr_name in ["spk_id", "speaker_id"]: speakers_dict = getattr(talker_config, attr_name, None) if speakers_dict and isinstance(speakers_dict, dict): # Normalize to lowercase for case-insensitive matching return {speaker.lower() for speaker in speakers_dict.keys()} logger.warning("No speakers found in talker_config (checked spk_id and speaker_id)") except Exception as e: logger.warning(f"Could not load speakers from model config: {e}") return set() def _estimate_ref_code_len(self, ref_audio: object) -> int | None: """Estimate ref_code length from ref_audio waveform without running the codec. The codec produces one frame per (output_sample_rate / encode_downsample_rate) audio samples, so ref_code_len = ceil(duration_seconds * codec_frame_rate). """ if self._codec_frame_rate is None: return None try: # ref_audio comes from tts_params as [[wav_array, sr]] or similar nested structure item = ref_audio while isinstance(item, list) and item: if len(item) == 2 and isinstance(item[1], (int, float)): break item = item[0] if isinstance(item, list) and len(item) == 2: wav, sr = item elif isinstance(item, tuple) and len(item) == 2: wav, sr = item else: return None sr = int(sr) if hasattr(wav, "__len__"): n_samples = len(wav) elif hasattr(wav, "shape"): n_samples = wav.shape[-1] if wav.ndim > 1 else wav.shape[0] else: return None if sr <= 0 or n_samples <= 0: return None duration = n_samples / sr return math.ceil(duration * self._codec_frame_rate) except Exception: return None def _estimate_prompt_len(self, tts_params: dict[str, Any]) -> int: """Estimate prompt length so the placeholder matches model-side embeddings.""" try: from vllm_omni.model_executor.models.qwen3_tts.qwen3_tts_talker import ( Qwen3TTSTalkerForConditionalGeneration, ) if self._tts_tokenizer is None: from transformers import AutoTokenizer model_name = self.engine_client.model_config.model self._tts_tokenizer = AutoTokenizer.from_pretrained( model_name, trust_remote_code=True, padding_side="left", ) hf_config = self.engine_client.model_config.hf_config talker_config = hf_config.talker_config task_type = (tts_params.get("task_type") or ["CustomVoice"])[0] return Qwen3TTSTalkerForConditionalGeneration.estimate_prompt_len_from_additional_information( additional_information=tts_params, task_type=task_type, tokenize_prompt=lambda t: self._tts_tokenizer(t, padding=False)["input_ids"], codec_language_id=getattr(talker_config, "codec_language_id", None), spk_is_dialect=getattr(talker_config, "spk_is_dialect", None), estimate_ref_code_len=self._estimate_ref_code_len, ) except Exception as e: logger.warning("Failed to estimate TTS prompt length, using fallback 2048: %s", e) return 2048 def _get_uploaded_audio_data(self, voice_name: str) -> str | None: """Get base64 encoded audio data for uploaded voice.""" voice_name_lower = voice_name.lower() if voice_name_lower not in self.uploaded_speakers: return None speaker_info = self.uploaded_speakers[voice_name_lower] file_path = Path(speaker_info["file_path"]) if not file_path.exists(): logger.warning(f"Audio file not found for voice {voice_name}: {file_path}") return None try: # Read audio file with open(file_path, "rb") as f: audio_bytes = f.read() # Encode to base64 audio_b64 = base64.b64encode(audio_bytes).decode("utf-8") # Get MIME type from file extension mime_type = speaker_info.get("mime_type", "audio/wav") # Return as data URL return f"data:{mime_type};base64,{audio_b64}" except Exception as e: logger.error(f"Could not read audio file for voice {voice_name}: {e}") return None async def upload_voice(self, audio_file: UploadFile, consent: str, name: str) -> dict: """Upload a new voice sample.""" # Validate file size (max 10MB) MAX_FILE_SIZE = 10 * 1024 * 1024 # 10MB audio_file.file.seek(0, 2) # Seek to end file_size = audio_file.file.tell() audio_file.file.seek(0) # Reset to beginning if file_size > MAX_FILE_SIZE: raise ValueError(f"File size exceeds maximum limit of 10MB. Got {file_size} bytes.") # Detect MIME type from filename if content_type is generic mime_type = audio_file.content_type if mime_type == "application/octet-stream": # Simple MIME type detection based on file extension filename_lower = audio_file.filename.lower() if filename_lower.endswith(".wav"): mime_type = "audio/wav" elif filename_lower.endswith((".mp3", ".mpeg")): mime_type = "audio/mpeg" elif filename_lower.endswith(".flac"): mime_type = "audio/flac" elif filename_lower.endswith(".ogg"): mime_type = "audio/ogg" elif filename_lower.endswith(".aac"): mime_type = "audio/aac" elif filename_lower.endswith(".webm"): mime_type = "audio/webm" elif filename_lower.endswith(".mp4"): mime_type = "audio/mp4" else: mime_type = "audio/wav" # Default # Validate MIME type allowed_mime_types = { "audio/mpeg", "audio/wav", "audio/x-wav", "audio/ogg", "audio/aac", "audio/flac", "audio/webm", "audio/mp4", } if mime_type not in allowed_mime_types: raise ValueError(f"Unsupported MIME type: {mime_type}. Allowed: {allowed_mime_types}") # Normalize voice name voice_name_lower = name.lower() # Check if voice already exists if voice_name_lower in self.uploaded_speakers: raise ValueError(f"Voice '{name}' already exists") # Sanitize name and consent to prevent path traversal sanitized_name = _sanitize_filename(name) sanitized_consent = _sanitize_filename(consent) # Generate filename with sanitized inputs timestamp = int(time.time()) file_suffix = Path(audio_file.filename).suffix file_ext = file_suffix[1:] if file_suffix and len(file_suffix) > 1 else "wav" # Sanitize file extension as well sanitized_ext = _sanitize_filename(file_ext) if not sanitized_ext or sanitized_ext == "file": sanitized_ext = "wav" filename = f"{sanitized_name}_{sanitized_consent}_{timestamp}.{sanitized_ext}" file_path = self.uploaded_speakers_dir / filename # Double-check that the path is within the upload directory if not _validate_path_within_directory(file_path, self.uploaded_speakers_dir): raise ValueError("Invalid file path: potential path traversal attack detected") # Save audio file try: with open(file_path, "wb") as f: content = await audio_file.read() f.write(content) except Exception as e: raise ValueError(f"Failed to save audio file: {e}") # Create speaker data speaker_data = { "name": name, "consent": consent, "file_path": str(file_path), "created_at": timestamp, "mime_type": mime_type, "original_filename": audio_file.filename, "file_size": file_size, "cache_status": "pending", # The initial cache state is pending. "cache_file": None, # The initial cache file is empty. "cache_generated_at": None, # The initial cache generation time is empty. } # Save metadata using metadata manager (concurrency safe) success = self.metadata_manager.create_speaker(voice_name_lower, speaker_data) if not success: # Clean up the saved file if metadata creation failed try: file_path.unlink() except Exception: pass raise ValueError(f"Failed to create metadata for voice '{name}' (possibly already exists)") # Update in-memory cache self.uploaded_speakers[voice_name_lower] = speaker_data self.supported_speakers.add(voice_name_lower) logger.info(f"Uploaded new voice '{name}' with consent ID '{consent}'") # Return voice information without exposing the server file path return { "name": name, "consent": consent, "created_at": timestamp, "mime_type": mime_type, "file_size": file_size, } async def delete_voice(self, name: str) -> bool: """ Delete an uploaded voice. Args: name: Voice name to delete Returns: bool: True if successful, False if voice doesn't exist """ voice_name_lower = name.lower() # Check if voice exists in memory cache if voice_name_lower not in self.uploaded_speakers: logger.warning(f"Voice '{name}' not found in memory cache") return False # Delete from metadata manager with file cleanup # Pass base_dir for path validation deleted_info = self.metadata_manager.delete_speaker(voice_name_lower) if not deleted_info: logger.error(f"Failed to delete voice '{name}' from metadata") return False # Update in-memory cache if voice_name_lower in self.uploaded_speakers: del self.uploaded_speakers[voice_name_lower] if voice_name_lower in self.supported_speakers: self.supported_speakers.remove(voice_name_lower) logger.info(f"Deleted voice '{name}' and associated files") return True def _is_tts_model(self) -> bool: """Check if the current model is a supported TTS model.""" stage_list = getattr(self.engine_client, "stage_list", None) if stage_list: for stage in stage_list: model_stage = getattr(stage, "model_stage", None) if model_stage in _TTS_MODEL_STAGES: return True return False def _validate_tts_request(self, request: OpenAICreateSpeechRequest) -> str | None: """Validate TTS request parameters. Returns error message or None.""" # Infer Base task when ref_audio or ref_text is provided without explicit task_type. if request.task_type is None and (request.ref_audio is not None or request.ref_text is not None): request.task_type = "Base" task_type = request.task_type or "CustomVoice" # Normalize voice to lowercase for case-insensitive matching if request.voice is not None: request.voice = request.voice.lower() # Validate input is not empty if not request.input or not request.input.strip(): return "Input text cannot be empty" # Validate language if request.language is not None and request.language not in _TTS_LANGUAGES: return f"Invalid language '{request.language}'. Supported: {', '.join(sorted(_TTS_LANGUAGES))}" # Validate speaker for CustomVoice task if task_type == "CustomVoice": if not self.supported_speakers: return ( "This model does not support CustomVoice task (no speakers configured). " "Use task_type='Base' with ref_audio/ref_text for voice cloning, " "or use a CustomVoice model." ) if request.voice is not None and request.voice not in self.supported_speakers: return f"Invalid speaker '{request.voice}'. Supported: {', '.join(sorted(self.supported_speakers))}" # Validate Base task requirements if task_type == "Base": if request.voice is None: if request.ref_audio is None: return "Base task requires 'ref_audio' for voice cloning" # Validate ref_audio format (include file:// from upstream) if not ( request.ref_audio.startswith(("http://", "https://")) or request.ref_audio.startswith("data:") or request.ref_audio.startswith("file://") ): return "ref_audio must be a URL (http/https), base64 data URL (data:...), or file URI (file://...)" # In-context voice cloning (default) requires non-empty ref_text. # x_vector_only_mode skips in-context and only uses speaker embedding. if not request.x_vector_only_mode: if not request.ref_text or not request.ref_text.strip(): return ( "Base task requires non-empty 'ref_text' (transcript of " "the reference audio) unless 'x_vector_only_mode' is enabled" ) else: # voice is not None voice_lower = request.voice.lower() if voice_lower in self.uploaded_speakers: # Check if audio file exists for uploaded speaker speaker_info = self.uploaded_speakers[voice_lower] file_path = Path(speaker_info["file_path"]) if not file_path.exists(): return f"Audio file for uploaded speaker '{request.voice}' not found on disk" else: # need ref_audio for built-in speaker if request.ref_audio is None: return ( f"Base task with built-in speaker '{request.voice}' requires 'ref_audio' for voice cloning" ) # Validate ref_audio format for built-in speaker if not ( request.ref_audio.startswith(("http://", "https://")) or request.ref_audio.startswith("data:") or request.ref_audio.startswith("file://") ): return ( "ref_audio must be a URL (http/https), base64 data URL (data:...), or file URI (file://...)" ) # Validate cross-parameter dependencies if task_type != "Base": if request.ref_text is not None: return "'ref_text' is only valid for Base task" if request.x_vector_only_mode is not None: return "'x_vector_only_mode' is only valid for Base task" # Validate VoiceDesign task requirements if task_type == "VoiceDesign" and not request.instructions: return "VoiceDesign task requires 'instructions' to describe the voice" # Validate instructions length (using cached value from initialization) if request.instructions and len(request.instructions) > self._max_instructions_length: return f"Instructions too long (max {self._max_instructions_length} characters)" # Validate max_new_tokens range if request.max_new_tokens is not None: if request.max_new_tokens < _TTS_MAX_NEW_TOKENS_MIN: return f"max_new_tokens must be at least {_TTS_MAX_NEW_TOKENS_MIN}" if request.max_new_tokens > _TTS_MAX_NEW_TOKENS_MAX: return f"max_new_tokens cannot exceed {_TTS_MAX_NEW_TOKENS_MAX}" return None async def _resolve_ref_audio(self, ref_audio_str: str) -> tuple[list[float], int]: """Resolve ref_audio to (wav_samples, sample_rate). Delegates to upstream vLLM's MediaConnector which handles http(s) URLs, ``data:`` base64 URIs, and ``file:`` local paths (the latter gated by ``--allowed-local-media-path``). """ model_config = self.model_config connector = MediaConnector( allowed_local_media_path=model_config.allowed_local_media_path, allowed_media_domains=model_config.allowed_media_domains, ) wav_np, sr = await connector.fetch_audio_async(ref_audio_str) wav_np = np.asarray(wav_np, dtype=np.float32) if wav_np.ndim > 1: wav_np = np.mean(wav_np, axis=-1) return wav_np.tolist(), int(sr) async def _generate_pcm_chunks(self, generator, request_id: str): """Generate PCM audio chunks for streaming response. Handles two audio output modes from the engine: - Cumulative mode (list): Engine returns growing list of chunks; we emit only the new tail on each iteration. - Per-step mode (tensor): Engine returns single tensor per iteration; we emit it directly. Args: generator: Async generator from the engine request_id: Request identifier for logging Yields: Raw PCM bytes for each audio chunk """ prev_count = 0 sample_rate_val = 24000 try: async for res in generator: audio_output, audio_key = self._extract_audio_output(res) if audio_key is None: continue sr_raw = audio_output.get("sr") if sr_raw is not None: sr_val = sr_raw[-1] if isinstance(sr_raw, list) and sr_raw else sr_raw sample_rate_val = sr_val.item() if hasattr(sr_val, "item") else int(sr_val) audio_val = audio_output[audio_key] if isinstance(audio_val, list): # Cumulative mode: each update grows the list; emit only new tail. new_chunks = audio_val[prev_count:] prev_count = len(audio_val) else: # Per-step mode: each update is a single tensor; emit directly. if audio_val is not None: new_chunks = [audio_val] prev_count += 1 else: new_chunks = [] for chunk_tensor in new_chunks: chunk_np = ( chunk_tensor.float().detach().cpu().numpy() if hasattr(chunk_tensor, "float") else chunk_tensor ) if chunk_np.ndim > 1: chunk_np = chunk_np.squeeze() audio_obj = CreateAudio( audio_tensor=chunk_np, sample_rate=sample_rate_val, response_format="pcm", speed=1.0, stream_format="audio", base64_encode=False, ) yield self.create_audio(audio_obj).audio_data except asyncio.CancelledError: logger.info("Streaming request %s cancelled by client", request_id) raise except Exception as e: logger.exception("Streaming speech generation failed for %s: %s", request_id, e) @staticmethod def _extract_audio_output(res) -> tuple[dict | None, str | None]: """Return (audio_output dict, audio key) or (None, None). Returns the raw dict so callers can apply their own extraction strategy: streaming needs per-chunk delta slicing; non-streaming needs full concatenation. """ mm = getattr(res, "multimodal_output", None) if not mm: ro = getattr(res, "request_output", None) mm = getattr(ro, "multimodal_output", None) if ro else None if not mm: return None, None key = "audio" if "audio" in mm else None return mm, key def _build_tts_params(self, request: OpenAICreateSpeechRequest) -> dict[str, Any]: """Build TTS parameters from request. Processes each parameter if present, skips if not. Values are wrapped in lists as required by the model. """ params: dict[str, Any] = {} # Text content (always required) params["text"] = [request.input] # Task type if request.task_type is not None: params["task_type"] = [request.task_type] else: params["task_type"] = ["CustomVoice"] # Language if request.language is not None: params["language"] = [request.language] else: params["language"] = ["Auto"] # Speaker (voice) if request.voice is not None: params["speaker"] = [request.voice] # If voice is an uploaded speaker and no ref_audio provided, auto-set it if request.voice.lower() in self.uploaded_speakers and request.ref_audio is None: audio_data = self._get_uploaded_audio_data(request.voice) if audio_data: params["ref_audio"] = [audio_data] params["x_vector_only_mode"] = [True] logger.info(f"Auto-set ref_audio for uploaded voice: {request.voice}") else: raise ValueError(f"Audio file for uploaded voice '{request.voice}' is missing or corrupted") elif params["task_type"][0] == "CustomVoice": params["speaker"] = ["Vivian"] # Default for CustomVoice # Instructions for style/emotion control if request.instructions is not None: params["instruct"] = [request.instructions] else: params["instruct"] = [""] # Voice clone: ref_audio resolved in create_speech(), not here. if request.ref_text is not None: params["ref_text"] = [request.ref_text] if request.x_vector_only_mode is not None: params["x_vector_only_mode"] = [request.x_vector_only_mode] # Generation parameters if request.max_new_tokens is not None: params["max_new_tokens"] = [request.max_new_tokens] else: params["max_new_tokens"] = [2048] if request.initial_codec_chunk_frames is not None: params["initial_codec_chunk_frames"] = [request.initial_codec_chunk_frames] # VoiceDesign requires non_streaming_mode (match offline script behaviour). # CustomVoice and Base rely on the model default (True and False respectively). if params["task_type"][0] == "VoiceDesign": params["non_streaming_mode"] = [True] return params async def create_speech( self, request: OpenAICreateSpeechRequest, raw_request: Request | None = None, ): """ Create Speech API similar to OpenAI's API. See https://platform.openai.com/docs/api-reference/audio/createSpeech for the API specification. This API mimics the OpenAI Create Speech API. For Qwen3-TTS models, additional parameters are supported: - task_type: "CustomVoice", "VoiceDesign", or "Base" - language: Language code (e.g., "Chinese", "English", "Auto") - voice: Speaker name (e.g., "Vivian", "Ryan") for CustomVoice - instructions: Voice style/emotion instructions - ref_audio: Reference audio for voice cloning (Base task) - ref_text: Transcript of reference audio (Base task) - x_vector_only_mode: Use speaker embedding only (Base task) Streaming is supported via stream=True with response_format='pcm'. Each Code2Wav chunk is yielded as raw PCM bytes as soon as it is decoded. """ error_check_ret = await self._check_model(request) if error_check_ret is not None: logger.error("Error with model %s", error_check_ret) return error_check_ret if self.engine_client.errored: raise self.engine_client.dead_error request_id = f"speech-{random_uuid()}" try: if self._is_tts: # Validate TTS parameters validation_error = self._validate_tts_request(request) if validation_error: return self.create_error_response(validation_error) tts_params = self._build_tts_params(request) if request.ref_audio is not None: wav_list, sr = await self._resolve_ref_audio(request.ref_audio) tts_params["ref_audio"] = [[wav_list, sr]] # Prompt length must match model-side embeddings; values are placeholders. ph_len = self._estimate_prompt_len(tts_params) prompt = {"prompt_token_ids": [1] * ph_len, "additional_information": tts_params} else: tts_params = {} prompt = {"prompt": request.input} logger.info( "TTS speech request %s: text=%r, task_type=%s", request_id, request.input[:50] + "..." if len(request.input) > 50 else request.input, tts_params.get("task_type", ["unknown"])[0], ) sampling_params_list = self.engine_client.default_sampling_params_list generator = self.engine_client.generate( prompt=prompt, request_id=request_id, sampling_params_list=sampling_params_list, output_modalities=["audio"], ) if request.stream: return StreamingResponse( self._generate_pcm_chunks(generator, request_id), media_type="audio/pcm", ) # Non-streaming: collect final output final_output: OmniRequestOutput | None = None async for res in generator: final_output = res if final_output is None: return self.create_error_response("No output generated from the model.") audio_output, audio_key = self._extract_audio_output(final_output) if audio_key is None: return self.create_error_response("TTS model did not produce audio output.") audio_tensor = audio_output[audio_key] sr_raw = audio_output.get("sr", 24000) sr_val = sr_raw[-1] if isinstance(sr_raw, list) and sr_raw else sr_raw sample_rate = sr_val.item() if hasattr(sr_val, "item") else int(sr_val) # async_chunk mode accumulates chunks as a list; concat first. if isinstance(audio_tensor, list): import torch audio_tensor = torch.cat(audio_tensor, dim=-1) if hasattr(audio_tensor, "float"): audio_tensor = audio_tensor.float().detach().cpu().numpy() if audio_tensor.ndim > 1: audio_tensor = audio_tensor.squeeze() audio_obj = CreateAudio( audio_tensor=audio_tensor, sample_rate=sample_rate, response_format=request.response_format or "wav", speed=request.speed or 1.0, stream_format=request.stream_format, base64_encode=False, ) audio_response = self.create_audio(audio_obj) return Response(content=audio_response.audio_data, media_type=audio_response.media_type) except asyncio.CancelledError: return self.create_error_response("Client disconnected") except ValueError as e: return self.create_error_response(e) except Exception as e: logger.exception("Speech generation failed: %s", e) return self.create_error_response(f"Speech generation failed: {e}")