app.py

from fastapi import FastAPI

# Create an instance of the FastAPI class
app = FastAPI()

# Define a route for the root endpoint
@app.get("/")
def read_root():
    return {"message": "Hello, World!"}
def detect_onnx_models(path):
    onnx_models = glob.glob(path + '/*.onnx')
    if len(onnx_models) > 1:
        return onnx_models
    elif len(onnx_models) == 1:
        return onnx_models[0]
    else:
        return None


def main():
    """Main entry point"""
    models_path = "/content/piper/src/python"
    logging.basicConfig(level=logging.DEBUG)
    providers = [
        "CPUExecutionProvider"
        if use_gpu is False
        else ("CUDAExecutionProvider", {"cudnn_conv_algo_search": "DEFAULT"})
    ]
    sess_options = onnxruntime.SessionOptions()
    model = None
    onnx_models = detect_onnx_models(models_path)
    speaker_selection = widgets.Dropdown(
        options=[],
        description=f'{lan.translate(lang, "Select speaker")}:',
        layout={'visibility': 'hidden'}
    )
    if onnx_models is None:
        if enhanced_accessibility:
            playaudio("novoices")
        raise Exception(lan.translate(lang, "No downloaded voice packages!"))
    elif isinstance(onnx_models, str):
        onnx_model = onnx_models
        model, config = load_onnx(onnx_model, sess_options, providers)
        if config["num_speakers"] > 1:
            speaker_selection.options = config["speaker_id_map"].values()
            speaker_selection.layout.visibility = 'visible'
            preview_sid = 0
            if enhanced_accessibility:
                playaudio("multispeaker")
        else:
            speaker_selection.layout.visibility = 'hidden'
            preview_sid = None

        if enhanced_accessibility:
            inferencing(
                model,
                config,
                preview_sid,
                lan.translate(
                    config["espeak"]["voice"][:2],
                    "Interface openned. Write your texts, configure the different synthesis options or download all the voices you want. Enjoy!"
                )
            )
    else:
        voice_model_names = []
        for current in onnx_models:
            voice_struct = current.split("/")[5]
            voice_model_names.append(voice_struct)
        if enhanced_accessibility:
            playaudio("selectmodel")
        selection = widgets.Dropdown(
            options=voice_model_names,
            description=f'{lan.translate(lang, "Select voice package")}:',
        )
        load_btn = widgets.Button(
            description=lan.translate(lang, "Load it!")
        )
        config = None
        def load_model(button):
            nonlocal config
            global onnx_model
            nonlocal model
            nonlocal models_path
            selected_voice = selection.value
            onnx_model = f"{models_path}/{selected_voice}"
            model, config = load_onnx(onnx_model, sess_options, providers)
            if enhanced_accessibility:
                playaudio("loaded")
            if config["num_speakers"] > 1:
                speaker_selection.options = config["speaker_id_map"].values()
                speaker_selection.layout.visibility = 'visible'
                if enhanced_accessibility:
                    playaudio("multispeaker")
            else:
                speaker_selection.layout.visibility = 'hidden'

        load_btn.on_click(load_model)
        display(selection, load_btn)
    display(speaker_selection)
    speed_slider = widgets.FloatSlider(
        value=1,
        min=0.25,
        max=4,
        step=0.1,
        description=lan.translate(lang, "Rate scale"),
        orientation='horizontal',
    )
    noise_scale_slider = widgets.FloatSlider(
        value=0.667,
        min=0.25,
        max=4,
        step=0.1,
        description=lan.translate(lang, "Phoneme noise scale"),
        orientation='horizontal',
    )
    noise_scale_w_slider = widgets.FloatSlider(
        value=1,
        min=0.25,
        max=4,
        step=0.1,
        description=lan.translate(lang, "Phoneme stressing scale"),
        orientation='horizontal',
    )
    play = widgets.Checkbox(
        value=True,
        description=lan.translate(lang, "Auto-play"),
        disabled=False
    )
    text_input = widgets.Text(
        value='',
        placeholder=f'{lan.translate(lang, "Enter your text here")}:',
        description=lan.translate(lang, "Text to synthesize"),
        layout=widgets.Layout(width='80%')
    )
    synthesize_button = widgets.Button(
        description=lan.translate(lang, "Synthesize"),
        button_style='success', # 'success', 'info', 'warning', 'danger' or ''
        tooltip=lan.translate(lang, "Click here to synthesize the text."),
        icon='check'
    )
    close_button = widgets.Button(
        description=lan.translate(lang, "Exit"),
        tooltip=lan.translate(lang, "Closes this GUI."),
        icon='check'
    )

    def on_synthesize_button_clicked(b):
        if model is None:
            if enhanced_accessibility:
                playaudio("nomodel")
            raise Exception(lan.translate(lang, "You have not loaded any model from the list!"))
        text = text_input.value
        if config["num_speakers"] > 1:
            sid = speaker_selection.value
        else:
            sid = None
        rate = speed_slider.value
        noise_scale = noise_scale_slider.value
        noise_scale_w = noise_scale_w_slider.value
        auto_play = play.value
        inferencing(model, config, sid, text, rate, noise_scale, noise_scale_w, auto_play)

    def on_close_button_clicked(b):
        clear_output()
        if enhanced_accessibility:
            playaudio("exit")

    synthesize_button.on_click(on_synthesize_button_clicked)
    close_button.on_click(on_close_button_clicked)
    display(text_input)
    display(speed_slider)
    display(noise_scale_slider)
    display(noise_scale_w_slider)
    display(play)
    display(synthesize_button)
    display(close_button)

def load_onnx(model, sess_options, providers = ["CPUExecutionProvider"]):
    _LOGGER.debug("Loading model from %s", model)
    config = load_config(model)
    model = onnxruntime.InferenceSession(
        str(model),
        sess_options=sess_options,
        providers= providers
    )
    _LOGGER.info("Loaded model from %s", model)
    return model, config

def load_config(model):
    with open(f"{model}.json", "r") as file:
        config = json.load(file)
    return config
PAD = "_"  # padding (0)
BOS = "^"  # beginning of sentence
EOS = "$"  # end of sentence

class PhonemeType(str, Enum):
    ESPEAK = "espeak"
    TEXT = "text"

def phonemize(config, text: str) -> List[List[str]]:
    """Text to phonemes grouped by sentence."""
    if config["phoneme_type"] == PhonemeType.ESPEAK:
        if config["espeak"]["voice"] == "ar":
            # Arabic diacritization
            # https://github.com/mush42/libtashkeel/
            text = tashkeel_run(text)
        return phonemize_espeak(text, config["espeak"]["voice"])
    if config["phoneme_type"] == PhonemeType.TEXT:
        return phonemize_codepoints(text)
    raise ValueError(f'Unexpected phoneme type: {config["phoneme_type"]}')

def phonemes_to_ids(config, phonemes: List[str]) -> List[int]:
    """Phonemes to ids."""
    id_map = config["phoneme_id_map"]
    ids: List[int] = list(id_map[BOS])
    for phoneme in phonemes:
        if phoneme not in id_map:
            print("Missing phoneme from id map: %s", phoneme)
            continue
        ids.extend(id_map[phoneme])
        ids.extend(id_map[PAD])
    ids.extend(id_map[EOS])
    return ids

def inferencing(model, config, sid, line, length_scale = 1, noise_scale = 0.667, noise_scale_w = 0.8, auto_play=True):
    audios = []
    if config["phoneme_type"] == "PhonemeType.ESPEAK":
        config["phoneme_type"] = "espeak"
    text = phonemize(config, line)
    for phonemes in text:
        phoneme_ids = phonemes_to_ids(config, phonemes)
        num_speakers = config["num_speakers"]
        if num_speakers == 1:
            speaker_id = None # for now
        else:
            speaker_id = sid
        text = np.expand_dims(np.array(phoneme_ids, dtype=np.int64), 0)
        text_lengths = np.array([text.shape[1]], dtype=np.int64)
        scales = np.array(
            [noise_scale, length_scale, noise_scale_w],
            dtype=np.float32,
        )
        sid = None
        if speaker_id is not None:
            sid = np.array([speaker_id], dtype=np.int64)
        audio = model.run(
            None,
            {
                "input": text,
                "input_lengths": text_lengths,
                "scales": scales,
                "sid": sid,
            },
        )[0].squeeze((0, 1))
        audio = audio_float_to_int16(audio.squeeze())
        audios.append(audio)
    merged_audio = np.concatenate(audios)
    sample_rate = config["audio"]["sample_rate"]
    display(Markdown(f"{line}"))
    display(Audio(merged_audio, rate=sample_rate, autoplay=auto_play))

def denoise(
    audio: np.ndarray, bias_spec: np.ndarray, denoiser_strength: float
) -> np.ndarray:
    audio_spec, audio_angles = transform(audio)

    a = bias_spec.shape[-1]
    b = audio_spec.shape[-1]
    repeats = max(1, math.ceil(b / a))
    bias_spec_repeat = np.repeat(bias_spec, repeats, axis=-1)[..., :b]

    audio_spec_denoised = audio_spec - (bias_spec_repeat * denoiser_strength)
    audio_spec_denoised = np.clip(audio_spec_denoised, a_min=0.0, a_max=None)
    audio_denoised = inverse(audio_spec_denoised, audio_angles)

    return audio_denoised


def stft(x, fft_size, hopsamp):
    """Compute and return the STFT of the supplied time domain signal x.
    Args:
        x (1-dim Numpy array): A time domain signal.
        fft_size (int): FFT size. Should be a power of 2, otherwise DFT will be used.
        hopsamp (int):
    Returns:
        The STFT. The rows are the time slices and columns are the frequency bins.
    """
    window = np.hanning(fft_size)
    fft_size = int(fft_size)
    hopsamp = int(hopsamp)
    return np.array(
        [
            np.fft.rfft(window * x[i : i + fft_size])
            for i in range(0, len(x) - fft_size, hopsamp)
        ]
    )


def istft(X, fft_size, hopsamp):
    """Invert a STFT into a time domain signal.
    Args:
        X (2-dim Numpy array): Input spectrogram. The rows are the time slices and columns are the frequency bins.
        fft_size (int):
        hopsamp (int): The hop size, in samples.
    Returns:
        The inverse STFT.
    """
    fft_size = int(fft_size)
    hopsamp = int(hopsamp)
    window = np.hanning(fft_size)
    time_slices = X.shape[0]
    len_samples = int(time_slices * hopsamp + fft_size)
    x = np.zeros(len_samples)
    for n, i in enumerate(range(0, len(x) - fft_size, hopsamp)):
        x[i : i + fft_size] += window * np.real(np.fft.irfft(X[n]))
    return x


def inverse(magnitude, phase):
    recombine_magnitude_phase = np.concatenate(
        [magnitude * np.cos(phase), magnitude * np.sin(phase)], axis=1
    )

    x_org = recombine_magnitude_phase
    n_b, n_f, n_t = x_org.shape  # pylint: disable=unpacking-non-sequence
    x = np.empty([n_b, n_f // 2, n_t], dtype=np.complex64)
    x.real = x_org[:, : n_f // 2]
    x.imag = x_org[:, n_f // 2 :]
    inverse_transform = []
    for y in x:
        y_ = istft(y.T, fft_size=1024, hopsamp=256)
        inverse_transform.append(y_[None, :])

    inverse_transform = np.concatenate(inverse_transform, 0)

    return inverse_transform


def transform(input_data):
    x = input_data
    real_part = []
    imag_part = []
    for y in x:
        y_ = stft(y, fft_size=1024, hopsamp=256).T
        real_part.append(y_.real[None, :, :])  # pylint: disable=unsubscriptable-object
        imag_part.append(y_.imag[None, :, :])  # pylint: disable=unsubscriptable-object
    real_part = np.concatenate(real_part, 0)
    imag_part = np.concatenate(imag_part, 0)

    magnitude = np.sqrt(real_part**2 + imag_part**2)
    phase = np.arctan2(imag_part.data, real_part.data)

    return magnitude, phase