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import os

import torch.nn.functional as F
import torchaudio
from loguru import logger
import gradio as gr

from huggingface_hub import hf_hub_download
import torch
import yaml

# from s3prl_vc.upstream.interface import get_upstream
# from s3prl.nn import Featurizer
# import s3prl_vc.models
# from s3prl_vc.utils import read_hdf5
# from s3prl_vc.vocoder import Vocoder


# ---------- Settings ----------
GPU_ID = '-1'
os.environ['CUDA_VISIBLE_DEVICES'] = GPU_ID
DEVICE = 'cuda' if GPU_ID != '-1' else 'cpu'

SERVER_PORT = 42208
SERVER_NAME = "0.0.0.0"
SSL_DIR = './keyble_ssl'

FS = 16000
resamplers = {}
MIN_REQUIRED_WAV_LENGTH = 1040

# EXAMPLE_DIR = './examples'
# en_examples = sorted(glob(os.path.join(EXAMPLE_DIR, "en", '*.wav')))
# jp_examples = sorted(glob(os.path.join(EXAMPLE_DIR, "jp", '*.wav')))
# zh_examples = sorted(glob(os.path.join(EXAMPLE_DIR, "zh", '*.wav')))

# TRGSPKS = ["TEF1", "TEF2", "TEM1", "TEM2"]

# ref_samples = {
    # trgspk: sorted(glob(os.path.join("./ref_samples", trgspk, '*.wav')))
    # for trgspk in TRGSPKS
# }

# ---------- Logging ----------
logger.add('app.log', mode='a')
logger.info('============================= App restarted =============================')

# ---------- Download models ----------
logger.info('============================= Download models ===========================')

model_paths = {
    "SSL-MOS, all training sets": {
        "ckpt": hf_hub_download(repo_id="unilight/sheet-models", filename="bvcc+nisqa+pstn+singmos+somos+tencent+tmhint-qi/sslmos+mdf/2337/checkpoint-86000steps.pkl"),
        "config": hf_hub_download(repo_id="unilight/sheet-models", filename="bvcc+nisqa+pstn+singmos+somos+tencent+tmhint-qi/sslmos+mdf/2337/config.yml"),
    }
}

# ---------- Model ----------
models = {}
for name, path_dict in model_paths.items():
    logger.info(f'============================= Setting up model for {name} =============')
    checkpoint_path = path_dict["ckpt"]
    config_path = path_dict["config"]
    with open(config_path) as f:
        config = yaml.load(f, Loader=yaml.Loader)

    if config["model_type"] == "SSLMOS":
        from models.sslmos import SSLMOS
        model = SSLMOS(
            config["model_input"],
            num_listeners=config.get("num_listeners", None),
            num_domains=config.get("num_domains", None),
            **config["model_params"],
        ).to(DEVICE)
    model.load_state_dict(torch.load(checkpoint_path, map_location="cpu")["model"])
    model = model.eval().to(DEVICE)
    logger.info(f"Loaded model parameters from {checkpoint_path}.")

    models[name] = model

def read_wav(wav_path):
    # read waveform
    waveform, sample_rate = torchaudio.load(
        wav_path, channels_first=False
    )  # waveform: [T, 1]

    # resample if needed
    if sample_rate != FS:
        resampler_key = f"{sample_rate}-{FS}"
        if resampler_key not in resamplers:
            resamplers[resampler_key] = torchaudio.transforms.Resample(
                sample_rate, FS, dtype=waveform.dtype
            )
        waveform = resamplers[resampler_key](waveform)

    waveform = waveform.squeeze(-1)

    # always pad to a minumum length
    if waveform.shape[0] < MIN_REQUIRED_WAV_LENGTH:
        to_pad = (MIN_REQUIRED_WAV_LENGTH - waveform.shape[0]) // 2
        waveform = F.pad(waveform, (to_pad, to_pad), "constant", 0)

    return waveform, sample_rate

def predict(model_name, wav_file):
    x, fs = read_wav(wav_file)
    logger.info('wav file loaded')

    # set up model input
    model_input = x.unsqueeze(0).to(DEVICE)
    model_lengths = model_input.new_tensor([model_input.size(1)]).long()
    inputs = {
        config["model_input"]: model_input,
        config["model_input"] + "_lengths": model_lengths,
    }

    with torch.no_grad():
        # model forward
        if config["inference_mode"] == "mean_listener":
            outputs = models[model_name].mean_listener_inference(inputs)
        elif config["inference_mode"] == "mean_net":
            outputs = models[model_name].mean_net_inference(inputs)

    pred_mean_scores = outputs["scores"].cpu().detach().numpy()[0]

    return pred_mean_scores

with gr.Blocks(title="S3PRL-VC: Any-to-one voice conversion demo on VCC2020") as demo:
    gr.Markdown(
        """
        # S3PRL-VC: Any-to-one voice conversion demo on VCC2020
        ### [[Paper (ICASSP2023)]](https://arxiv.org/abs/2110.06280) [[Paper(JSTSP)]](https://arxiv.org/abs/2207.04356) [[Code]](https://github.com/unilight/s3prl-vc)
        **S3PRL-VC** is a voice conversion (VC) toolkit for benchmarking self-supervised speech representations (S3Rs). The term **any-to-one** means that the system can convert from any unseen speaker to a pre-defined speaker given in training.
        In this demo, you can record your voice, and the model will convert your voice to one of the four pre-defined speakers. These four speakers come from the **voice conversion challenge (VCC) 2020**. You can listen to the samples to get a sense of what these speakers sound like.
        The **RTF** of the system is around **1.5~2.5**, i.e. if you recorded a 5 second long audio, it will take 5 * (1.5~2.5) = 7.5~12.5 seconds to generate the output.
        """
    )

    with gr.Row():
        with gr.Column():
            gr.Markdown("## Record your speech here!")
            input_wav = gr.Audio(label="Input speech", source='microphone', type='filepath')

            gr.Markdown("## Select a model!")
            model_name = gr.Radio(label="Model", choices=list(model_paths.keys()))

            evaluate_btn = gr.Button(value="Evaluate!")
            # gr.Markdown("### You can use these examples if using a microphone is too troublesome!")
            # gr.Markdown("I recorded the samples using my Macbook Pro, so there might be some noises.")
            # gr.Examples(
            #     examples=en_examples,
            #     inputs=input_wav,
            #     label="English examples"
            # )
            # gr.Examples(
            #     examples=jp_examples,
            #     inputs=input_wav,
            #     label="Japanese examples"
            # )
            # gr.Examples(
            #     examples=zh_examples,
            #     inputs=input_wav,
            #     label="Mandarin examples"
            # )
        
        with gr.Column():
            gr.Markdown("## The predicted scores is here:")
            output_score = gr.Textbox(label="Prediction", interactive=False)
        evaluate_btn.click(predict, [model_name, input_wav], output_score)

if __name__ == '__main__':
    try:
        demo.launch(debug=True,
                     enable_queue=True,
                     )    
    except KeyboardInterrupt as e:
        print(e)

    finally:
        demo.close()