cli/inference.py

# Copyright (c) 2025 SparkAudio
#               2025 Xinsheng Wang (w.xinshawn@gmail.com)
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


import os
import argparse
import torch
import soundfile as sf
import logging
from datetime import datetime
import platform

from cli.SparkTTS import SparkTTS


def parse_args():
    """Parse command-line arguments."""
    parser = argparse.ArgumentParser(description="Run TTS inference.")

    parser.add_argument(
        "--model_dir",
        type=str,
        default="pretrained_models/Spark-TTS-0.5B",
        help="Path to the model directory",
    )
    parser.add_argument(
        "--save_dir",
        type=str,
        default="example/results",
        help="Directory to save generated audio files",
    )
    parser.add_argument("--device", type=int, default=0, help="CUDA device number")
    parser.add_argument(
        "--text", type=str, required=True, help="Text for TTS generation"
    )
    parser.add_argument("--prompt_text", type=str, help="Transcript of prompt audio")
    parser.add_argument(
        "--prompt_speech_path",
        type=str,
        help="Path to the prompt audio file",
    )
    parser.add_argument("--gender", choices=["male", "female"])
    parser.add_argument(
        "--pitch", choices=["very_low", "low", "moderate", "high", "very_high"]
    )
    parser.add_argument(
        "--speed", choices=["very_low", "low", "moderate", "high", "very_high"]
    )
    return parser.parse_args()


def run_tts(args):
    """Perform TTS inference and save the generated audio."""
    logging.info(f"Using model from: {args.model_dir}")
    logging.info(f"Saving audio to: {args.save_dir}")

    # Ensure the save directory exists
    os.makedirs(args.save_dir, exist_ok=True)

    # Convert device argument to torch.device
    if platform.system() == "Darwin" and torch.backends.mps.is_available():
        # macOS with MPS support (Apple Silicon)
        device = torch.device(f"mps:{args.device}")
        logging.info(f"Using MPS device: {device}")
    elif torch.cuda.is_available():
        # System with CUDA support
        device = torch.device(f"cuda:{args.device}")
        logging.info(f"Using CUDA device: {device}")
    else:
        # Fall back to CPU
        device = torch.device("cpu")
        logging.info("GPU acceleration not available, using CPU")

    # Initialize the model
    model = SparkTTS(args.model_dir, device)

    # Generate unique filename using timestamp
    timestamp = datetime.now().strftime("%Y%m%d%H%M%S")
    save_path = os.path.join(args.save_dir, f"{timestamp}.wav")

    logging.info("Starting inference...")

    # Perform inference and save the output audio
    with torch.no_grad():
        wav = model.inference(
            args.text,
            args.prompt_speech_path,
            prompt_text=args.prompt_text,
            gender=args.gender,
            pitch=args.pitch,
            speed=args.speed,
        )
        sf.write(save_path, wav, samplerate=16000)

    logging.info(f"Audio saved at: {save_path}")


if __name__ == "__main__":
    logging.basicConfig(
        level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s"
    )

    args = parse_args()
    run_tts(args)