app.py

import io
from threading import Thread
import random
import os

import numpy as np
import spaces
import gradio as gr
import torch

from parler_tts import ParlerTTSForConditionalGeneration
from pydub import AudioSegment
from transformers import AutoTokenizer, AutoFeatureExtractor, set_seed
from huggingface_hub import InferenceClient
from streamer import ParlerTTSStreamer


device = "cuda:0" if torch.cuda.is_available() else "mps" if torch.backends.mps.is_available() else "cpu"
torch_dtype = torch.float16 if device != "cpu" else torch.float32

repo_id = "parler-tts/parler_tts_mini_v0.1"

jenny_repo_id = "ylacombe/parler-tts-mini-jenny-30H"

model = ParlerTTSForConditionalGeneration.from_pretrained(
    jenny_repo_id, torch_dtype=torch_dtype, low_cpu_mem_usage=True
).to(device)

client = InferenceClient(token=os.getenv("HF_TOKEN"))

tokenizer = AutoTokenizer.from_pretrained(repo_id)
feature_extractor = AutoFeatureExtractor.from_pretrained(repo_id)

SAMPLE_RATE = feature_extractor.sampling_rate
SEED = 42


def numpy_to_mp3(audio_array, sampling_rate):
    # Normalize audio_array if it's floating-point
    if np.issubdtype(audio_array.dtype, np.floating):
        max_val = np.max(np.abs(audio_array))
        audio_array = (audio_array / max_val) * 32767 # Normalize to 16-bit range
        audio_array = audio_array.astype(np.int16)

    # Create an audio segment from the numpy array
    audio_segment = AudioSegment(
        audio_array.tobytes(),
        frame_rate=sampling_rate,
        sample_width=audio_array.dtype.itemsize,
        channels=1
    )

    # Export the audio segment to MP3 bytes - use a high bitrate to maximise quality
    mp3_io = io.BytesIO()
    audio_segment.export(mp3_io, format="mp3", bitrate="320k")

    # Get the MP3 bytes
    mp3_bytes = mp3_io.getvalue()
    mp3_io.close()

    return mp3_bytes

sampling_rate = model.audio_encoder.config.sampling_rate
frame_rate = model.audio_encoder.config.frame_rate


def generate_response(audio):
    yield None, gr.Textbox(visible=True)
    question = client.automatic_speech_recognition(audio)

    messages = [{"role": "sytem", "content": ("You are a magic 8 ball."
                                              "Someone will present to you a situation or question and your job "
                                              "is to answer with a cryptic addage or proverb such as "
                                              "'curiosity killed the cat' or 'The early bird gets the worm'.")},
                {"role": "user", "content": f"Please tell me what to do about {question}"}]
    
    response = client.chat_completion(messages, max_tokens=128, seed=random.randint(1, 5000))
    response = response.choices[0].message.content
    yield response, gr.Textbox(visible=True)


@spaces.GPU
def generate_base(answer):

    play_steps_in_s = 1.0
    play_steps = int(frame_rate * play_steps_in_s)

    description = "Jenny speaks at an average pace with a calm delivery in a very confined sounding environment with clear audio quality."
    description_tokens = tokenizer(description, return_tensors="pt").to(device)

    streamer = ParlerTTSStreamer(model, device=device, play_steps=play_steps)
    prompt = tokenizer(answer, return_tensors="pt").to(device)

    generation_kwargs = dict(
        input_ids=description_tokens.input_ids,
        prompt_input_ids=prompt.input_ids,
        streamer=streamer,
        do_sample=True,
        temperature=1.0,
        min_new_tokens=10,
    )

    set_seed(SEED)
    thread = Thread(target=model.generate, kwargs=generation_kwargs)
    thread.start()

    for new_audio in streamer:
        print(f"Sample of length: {round(new_audio.shape[0] / sampling_rate, 2)} seconds")
        yield gr.Textbox(value=answer, visible=True), numpy_to_mp3(new_audio, sampling_rate=sampling_rate)

css=""".my-group {max-width: 600px !important; max-height: 600 !important;}
                      .my-column {display: flex !important; justify-content: center !important; align-items: center !important};"""


with gr.Blocks() as block:
    gr.HTML(
        f"""
        <h1 style='text-align: center;'> Magic 8 Ball 🎱 </h1>
        <p style='text-align: center;'> Powered by <a href="https://github.com/huggingface/parler-tts"> Parler-TTS</a>
        """
    )
    with gr.Group():
        with gr.Row():
            audio_out = gr.Audio(visible=False, streaming=True)
            answer = gr.Textbox(visible=False, label="Answer")
            state = gr.State()
            
        with gr.Row():
            audio_in = gr.Audio(label="Speak you question", sources="microphone", type="filepath")

    audio_in.stop_recording(generate_response, audio_in, [state, answer]).then(fn=generate_base, inputs=state, outputs=[answer, audio_out])

block.launch()