app.py

'''
import gradio as gr
from transformers import pipeline

# Load pipelines for Canary ASR, LLama3 QA, and VITS TTS
asr_pipeline = pipeline("automatic-speech-recognition", model="nvidia/canary-1b", device=0)
qa_pipeline = pipeline("question-answering", model="LLAMA/llama3-base-qa", tokenizer="LLAMA/llama3-base-qa")
tts_pipeline = pipeline("text-to-speech", model="patrickvonplaten/vits-large", device=0)
'''

import gradio as gr
import json
import librosa
import os
import soundfile as sf
import tempfile
import uuid
from transformers import pipeline

import torch


SAMPLE_RATE = 16000 # Hz
MAX_AUDIO_SECS = 30 # wont try to transcribe if longer than this
src_lang = "en"
tgt_lang = "en"
pnc="no"

def convert_audio(audio_filepath, tmpdir, utt_id):
	"""
	Convert all files to monochannel 16 kHz wav files.
	Do not convert and raise error if audio too long.
	Returns output filename and duration.
	"""
	data, sr = librosa.load(audio_filepath, sr=None, mono=True)

	duration = librosa.get_duration(y=data, sr=sr)

	if duration > MAX_AUDIO_SECS:
		raise gr.Error(
			f"This demo can transcribe up to {MAX_AUDIO_MINUTES} minutes of audio. "
			"If you wish, you may trim the audio using the Audio viewer in Step 1 "
			"(click on the scissors icon to start trimming audio)."
		)

	if sr != SAMPLE_RATE:
		data = librosa.resample(data, orig_sr=sr, target_sr=SAMPLE_RATE)

	out_filename = os.path.join(tmpdir, utt_id + '.wav')

	# save output audio
	sf.write(out_filename, data, SAMPLE_RATE)

	return out_filename, duration


# Load the ASR pipeline
asr_pipeline = pipeline("automatic-speech-recognition", model="nvidia/canary-1b")

def transcribe(audio_filepath, src_lang, tgt_lang, pnc):
    if audio_filepath is None:
        raise gr.Error("Please provide some input audio: either upload an audio file or use the microphone")

    utt_id = uuid.uuid4()

    with tempfile.TemporaryDirectory() as tmpdir:
        # Make manifest file and save
        manifest_data = {
            "audio_filepath": audio_filepath,
            "source_lang": src_lang,
            "target_lang": tgt_lang,
            "taskname": "asr",  # Setting taskname to "asr"
            "pnc": pnc,
            "answer": "predict"
        }

        manifest_filepath = os.path.join(tmpdir, f'{utt_id}.json')

        with open(manifest_filepath, 'w') as fout:
            json.dump(manifest_data, fout)

        # Transcribe audio using ASR pipeline
        transcribed_text = asr_pipeline(audio_filepath)
        output_text = transcribed_text[0]['transcription']

    return output_text



with gr.Blocks(
	title="NeMo Canary Model",
	css="""
		textarea { font-size: 18px;}
		#model_output_text_box span {
			font-size: 18px;
			font-weight: bold;
		}
	""",
	theme=gr.themes.Default(text_size=gr.themes.sizes.text_lg) # make text slightly bigger (default is text_md )
) as demo:

	gr.HTML("<h1 style='text-align: center'>NeMo Canary model: Transcribe & Translate audio</h1>")

	with gr.Row():
		with gr.Column():
			gr.HTML(
				"<p><b>Step 1:</b> Upload an audio file or record with your microphone.</p>"

				"<p style='color: #A0A0A0;'>This demo supports audio files up to 10 mins long. "
				"You can transcribe longer files locally with this NeMo "
				"<a href='https://github.com/NVIDIA/NeMo/blob/main/examples/asr/speech_multitask/speech_to_text_aed_chunked_infer.py'>script</a>.</p>"
			)

			audio_file = gr.Audio(sources=["microphone", "upload"], type="filepath")

			gr.HTML("<p><b>Step 2:</b> Choose the input and output language.</p>")

			
		with gr.Column():

			gr.HTML("<p><b>Step 3:</b> Run the model.</p>")

			go_button = gr.Button(
				value="Run model",
				variant="primary", # make "primary" so it stands out (default is "secondary")
			)

			model_output_text_box = gr.Textbox(
				label="Model Output",
				elem_id="model_output_text_box",
			)

	with gr.Row():

		gr.HTML(
			"<p style='text-align: center'>"
				"🐤 <a href='https://huggingface.co/nvidia/canary-1b' target='_blank'>Canary model</a> | "
				"🧑‍💻 <a href='https://github.com/NVIDIA/NeMo' target='_blank'>NeMo Repository</a>"
			"</p>"
		)

	go_button.click(
		fn=transcribe, 
		inputs = [audio_file],
		outputs = [model_output_text_box]
	)


demo.queue()
demo.launch()

'''


# Function to capture audio using Canary ASR
def capture_audio():
    utt_id = uuid.uuid4()
	with tempfile.TemporaryDirectory() as tmpdir:
		converted_audio_filepath, duration = convert_audio(audio_filepath, tmpdir, str(utt_id))
        
    manifest_data = {
			"audio_filepath": converted_audio_filepath,
			"source_lang": "en",
			"target_lang": "en",
			"taskname": taskname,
			"pnc": pnc,
			"answer": "predict",
			"duration": 10,
		}

		manifest_filepath = os.path.join(tmpdir, f'{utt_id}.json')

    print("Listening for cue words...")
    while True:
        audio_input = asr_pipeline(None)[0]['input_values']
        transcript = asr_pipeline(audio_input)[0]['transcription']
        if "hey canary" in transcript.lower():
            print("Cue word detected!")
            break
    print("Listening...")
    return audio_input

# AI assistant function
def ai_assistant(audio_input):
    # Perform automatic speech recognition (ASR)
    transcript = asr_pipeline(audio_input)[0]['transcription']

    # Perform question answering (QA)
    qa_result = qa_pipeline(question=transcript, context="Insert your context here")

    # Convert the QA result to speech using text-to-speech (TTS)
    tts_output = tts_pipeline(qa_result['answer'])

    return tts_output[0]['audio']

if __name__ == "__main__":
    # Create a Gradio interface
    gr.Interface(ai_assistant,
                 inputs=gr.inputs.Audio(capture=capture_audio, label="Speak Here"),
                 outputs=gr.outputs.Audio(type="audio", label="Assistant's Response"),
                 title="AI Assistant",
                 description="An AI Assistant that answers questions based on your speech input.").launch()
'''