app.py

from io import BytesIO   
from typing import Tuple
import wave
import gradio as gr 
import numpy as np
from pydub.audio_segment import AudioSegment
import requests
from os.path import exists
from stt import Model  

import torch
from transformers import pipeline
import librosa
import torchaudio
from speechbrain.pretrained import EncoderClassifier

UI_STRINGS = {
    "title": {
        "es": "Reconocimiento de Dictado en Chatino, Mixteco, Totonaco y Español",
        "en": "Speech recognition in Chatino, Mixtec, Totonac and Spanish",
    },
    "description": {
        "es": "Una demo de identificar frases del español y de tres lenguas indígenas de México, y proveer el texto de cada una",
        "en": "A demo of identifying phrases in Spanish and three Mexican indigenous languages, and providing transcripts of each",
    },
    "article": {
        "es":  "La identificación de lenguas usa el modelo"
                " [lang-id-commonlanguage-ecapa de Speechbrain](https://huggingface.co/speechbrain/lang-id-commonlanguage_ecapa)"
                " y aquí se supone que si la lengua no es español, debe ser la lengua indígena del contexto."
                "\n\n"
                "Chatino: Prueba de dictado a texto para el chatino de la sierra (Quiahije) "
                " usando [el modelo entrenado por Bülent Özden](https://coqui.ai/chatino/bozden/v1.0.0)"
                " con [los datos recopilados por Hilaria Cruz y sus colaboradores](https://gorilla.linguistlist.org/code/ctp/)."
                "\n\n"
                "Mixteco: Prueba de dictado a texto para el mixteco de Yoloxochitl,"
                " usando [el modelo entrenado por Josh Meyer](https://coqui.ai/mixtec/jemeyer/v1.0.0/)"
                " con [los datos recopilados por Rey Castillo y sus colaboradores](https://www.openslr.org/89)."
                " \n\n"
                "Totonaco: Prueba de dictado a texto para el totonaco de la sierra,"
                " usando [el modelo entrenado por Bülent Özden](https://coqui.ai/totonac/bozden/v1.0.0)"
                " con [los datos recopilados por Osbel López Francisco y sus colaboradores](https://www.openslr.org/107)."
                " \n\n"
                "Los ejemplos vienen del proyecto [DEMCA](https://demca.mesolex.org/) de Jonathan Amith. "
                " Esta demo es basada en la de [Ukraniano](https://huggingface.co/spaces/robinhad/ukrainian-stt).",
        "en": "The language identification uses the model"
                " [lang-id-commonlanguage-ecapa from Speechbrain](https://huggingface.co/speechbrain/lang-id-commonlanguage_ecapa)"
                " and here it is assumed that if the language is not Spanish, it must be the indigenous language of the context."
                "\n\n"
                "Chatino: Test of speech-to-text for Highland Chatino (Quiahije) "
                " using [the model trained by Bülent Özden](https://coqui.ai/chatino/bozden/v1.0.0)"
                " with [the data compiled by Hilaria Cruz and collaborators](https://gorilla.linguistlist.org/code/ctp/)."
                "\n\n"
                "Mixtec: Test of speech-to-text for Yoloxochitl Mixtec,"
                " using [the model trained by Josh Meyer](https://coqui.ai/mixtec/jemeyer/v1.0.0/)"
                " with [the data compiled by Rey Castillo and collaborators](https://www.openslr.org/89)."
                "\n\n"
                "Totonac: Test of speech-to-text for Highland Totonac,"
                " using [the model trained by Bülent Özden](https://coqui.ai/chatino/bozden/v1.0.0)"
                " with [the data compiled by Osbel López Francisco and collaborators](https://www.openslr.org/107)."
                "\n\n"
                "The examples come from the Jonathan Amith's [DEMCA](https://demca.mesolex.org/) project. "
                " This demo is based on the one for [Ukrainian](https://huggingface.co/spaces/robinhad/ukrainian-stt).",
    },
    "languages": {
        "mixteco": {
            "es": "mixteco",
            "en": "Mixtec",
        },
        "chatino": {
            "es": "chatino",
            "en": "Chatino",
        },
        "totonaco": {
            "es": "totonaco",
            "en": "Totonac",
        },
        "español": {
            "es": "español",
            "en": "Spanish",
        },
        "inglés": {
            "es": "inglés",
            "en": "English",
        }
    },
    "labels": {
        "target": {
            "es": "Lengua principal",
            "en": "Primary language",
        },
        "input": {
            "es": "Audio",
            "en": "Audio",
        },
        "output": {
            "es": "Resulto",
            "en": "Result",
        }
    }
}


# initialize language ID model
lang_classifier = EncoderClassifier.from_hparams(
    source="speechbrain/lang-id-commonlanguage_ecapa", 
    savedir="pretrained_models/lang-id-commonlanguage_ecapa"
)


# download STT models
model_info = {
    "mixteco": ("https://coqui.gateway.scarf.sh/mixtec/jemeyer/v1.0.0/model.tflite", "mixtec.tflite"),
    "chatino": ("https://coqui.gateway.scarf.sh/chatino/bozden/v1.0.0/model.tflite", "chatino.tflite"),
    "totonaco": ("https://coqui.gateway.scarf.sh/totonac/bozden/v1.0.0/model.tflite", "totonac.tflite"),
    "español": ("jonatasgrosman/wav2vec2-large-xlsr-53-spanish", "spanish_xlsr"),
    "inglés": ("facebook/wav2vec2-large-robust-ft-swbd-300h", "english_xlsr"),
}


def load_hf_model(model_path="facebook/wav2vec2-large-robust-ft-swbd-300h"):
    return pipeline("automatic-speech-recognition", model=model_path)


def load_coqui_models(language):

    model_path, file_name = model_info.get(language, ("", ""))

    if not exists(file_name):
        print(f"Downloading {model_path}")
        r = requests.get(model_path, allow_redirects=True)
        with open(file_name, 'wb') as file:
            file.write(r.content)
    else:
        print(f"Found {file_name}. Skipping download...")
    return Model(file_name)


STT_MODELS = {lang: load_hf_model(model_info[lang][0]) for lang in ("español",)}
for lang in ('mixteco', 'chatino', 'totonaco'):
    STT_MODELS[lang] = load_coqui_models(lang)


def client(audio_data: np.array, sample_rate: int, default_lang: str):
    output_audio = _convert_audio(audio_data, sample_rate)
    waveform, _ = torchaudio.load(output_audio)
    out_prob, score, index, text_lab = lang_classifier.classify_batch(waveform)
    text_lab = text_lab[0]

    output_audio.seek(0)
    fin = wave.open(output_audio, 'rb')
    coqui_audio = np.frombuffer(fin.readframes(fin.getnframes()), np.int16)

    output_audio.seek(0)
    hf_audio, _ = librosa.load(output_audio)

    fin.close()
    print(default_lang, text_lab)

    if text_lab == 'Spanish':
        text_lab = UI_STRINGS["languages"]['español'][ui_language]

        asr_pipeline = STT_MODELS['español']
        result = asr_pipeline(hf_audio, chunk_length_s=5, stride_length_s=1)['text']

    else:
        text_lab = UI_STRINGS["languages"][default_lang][ui_language]
        ds = STT_MODELS[default_lang]
        result = ds.stt(coqui_audio)

    return f"{text_lab}: {result}"


def stt(default_lang: str, audio: Tuple[int, np.array]):
    sample_rate, audio = audio
    use_scorer = False

    recognized_result = client(audio, sample_rate, default_lang)

    return recognized_result


def _convert_audio(audio_data: np.array, sample_rate: int):
    source_audio = BytesIO()
    source_audio.write(audio_data)
    source_audio.seek(0)
    output_audio = BytesIO()
    wav_file = AudioSegment.from_raw(
        source_audio,
        channels=1,
        sample_width=2,
        frame_rate=sample_rate
    )
    wav_file.set_frame_rate(16000).set_channels(1).export(output_audio, "wav", codec="pcm_s16le")
    output_audio.seek(0)
    return output_audio

def iface(ui_language):
    return gr.Interface(
        fn=stt,
        inputs=[
            gr.inputs.Radio(choices=("chatino", "mixteco", "totonaco"), default="mixteco", label=UI_STRINGS["labels"]["target"][ui_language]),
            gr.inputs.Audio(type="numpy", label=UI_STRINGS["labels"]["input"][ui_language], source="microphone", optional=False),
        ],
        outputs=gr.outputs.Textbox(label=UI_STRINGS["labels"]["output"][ui_language]),
        title=UI_STRINGS["title"][ui_language],
        theme="huggingface",
        description=UI_STRINGS["description"][ui_language],
        examples=[["mixteco", "ejemplos/espanol1.wav"],
                ["mixteco", "ejemplos/espanol2-Yolox_BotFl_CTB501-FEF537-EGS503_40202-Acanthaceae-Ruellia_2017-01-05-h.wav"],
                ["mixteco", "ejemplos/mixteco1-Yolox_BotFl_CTB501-FEF537-EGS503_40202-Acanthaceae-Ruellia_2017-01-05-h.wav"],
                ["mixteco", "ejemplos/mixteco2-Yolox_BotFl_CTB501-FEF537-EGS503_40202-Acanthaceae-Ruellia_2017-01-05-h.wav"],
                ["totonaco", "ejemplos/totonaco1-Zongo_Botan_Acanthaceae-Justicia-spicigera_SLC388-IPN389_2018-07-26-i.wav"],
                ["totonaco", "ejemplos/totonaco2-Zongo_Botan_Acanthaceae-Justicia-spicigera_SLC388-IPN389_2018-07-26-i.wav"]],
        article=UI_STRINGS["title"][ui_language],
    )

es_iface = iface('es')
en_iface = iface('en')

with gr.Blocks() as demo:
    gr.Markdown('Select language of interface | Escoja lengua de la interfaz')
    with gr.Tabs():
        with gr.TabItem("Español"):
            es_iface.render()
        with gr.TabItem("English"):
            en_iface.render()

demo.launch()