app.py

import gradio as gr

from diffusers import AudioLDMPipeline, DPMSolverMultistepScheduler

from transformers import AutoProcessor, ClapModel

import torch
# import scipy

device="cpu"

repo_id = "cvssp/audioldm-s-full-v2"
pipe = AudioLDMPipeline.from_pretrained(repo_id, torch_dtype=torch.float32)
#pipe.scheduler = DPMSolverMultistepScheduler.from_config(pipe.scheduler.config)
pipe = pipe.to(device)

clap_model = ClapModel.from_pretrained("sanchit-gandhi/clap-htsat-unfused-m-full").to(device)
processor = AutoProcessor.from_pretrained("sanchit-gandhi/clap-htsat-unfused-m-full")

generator = torch.Generator(device)

def texttoaudio(prompt, neg_prompt, seed, inf_steps, guidance_scale, n_candidates):
    if prompt is None:
        raise gr.Error("Please provide a text input.")
        
    waveforms = pipe(
                 prompt, 
                 negative_prompt=neg_prompt,
                 num_inference_steps=int(inf_steps),
                 guidance_scale=guidance_scale,
                 audio_length_in_s=5.0,
                 generator=generator.manual_seed(int(seed)),
                 num_waveforms_per_prompt=int(n_candidates) if n_candidates else 1,
                )["audios"]

    # save the audio sample as a .wav file
    # scipy.io.wavfile.write("output.wav", rate=16000, data=audio)
    if waveforms.shape[0] > 1:
        waveform = score_waveforms(prompt, waveforms)
    else:
        waveform = waveforms[0]

    return (16000, waveform)

def score_waveforms(text, waveforms):
    inputs = processor(text=text, audios=list(waveforms), return_tensors="pt", padding=True)
    inputs = {key: inputs[key].to(device) for key in inputs}
    with torch.no_grad():
        logits_per_text = clap_model(**inputs).logits_per_text  # this is the audio-text similarity score
        probs = logits_per_text.softmax(dim=-1)  # we can take the softmax to get the label probabilities
        most_probable = torch.argmax(probs)  # and now select the most likely audio waveform
    waveform = waveforms[most_probable]
    return waveform

iface = gr.Interface(fn=texttoaudio, title="AudioLDM Testing Playground", inputs=["text", "text", "number", "number", "number", "number"], outputs="audio")

iface.launch()