app.py

# imports from gradio_demo.py
import gradio as gr 
import spaces
import numpy as np
from PIL import Image
import torch 
from torchvision.transforms import ToTensor, ToPILImage
import sys
import os
from midi_player import MIDIPlayer
from midi_player.stylers import basic, cifka_advanced, dark
import numpy as np 
from time import sleep
from subprocess import call
import pandas as pd

# imports from sample.py
import argparse
from pathlib import Path
import accelerate
import safetensors.torch as safetorch
#import torch
from tqdm import trange, tqdm
#from PIL import Image
from torchvision import transforms
import k_diffusion as K

# test natten import:
import natten
import accelerate

from sample import zero_wrapper


from pom.pianoroll import regroup_lines, img_file_2_midi_file, square_to_rect, rect_to_square
from pom.square_to_rect import square_to_rect


CT_HOME = '.'

def infer_mask_from_init_img(img, mask_with='grey'):
    "note, this works whether image is normalized on 0..1 or -1..1, but not 0..255"
    assert mask_with in ['blue','white','grey']
    "given an image with mask areas marked, extract the mask itself"
    print("\n in infer_mask_from_init_img: ")
    if not torch.is_tensor(img):
        img = ToTensor()(img)
    print("    img.shape: ", img.shape)
    # shape of mask should be img shape without the channel dimension
    if len(img.shape) == 3:
        mask = torch.zeros(img.shape[-2:])
    elif len(img.shape) == 2:
        mask = torch.zeros(img.shape)
    print("    mask.shape: ", mask.shape)
    if mask_with == 'white':
        mask[ (img[0,:,:]==1) & (img[1,:,:]==1) & (img[2,:,:]==1)] = 1
    elif mask_with == 'blue':
        mask[img[2,:,:]==1] = 1  # blue
    if mask_with == 'grey':
        mask[ (img[0,:,:] != 0) & (img[0,:,:]==img[1,:,:])  & (img[2,:,:]==img[1,:,:])] = 1
    return mask*1.0


def count_notes_in_mask(img, mask):
    "counts the number of new notes in the mask"
    img_t = ToTensor()(img)
    new_notes = (mask * (img_t[1,:,:] > 0)).sum() # green channel
    return new_notes.item()


def grab_dense_gen(init_img, 
                PREFIX, 
                num_to_gen=64, 
                busyness=100, # after ranking images by how many notes were in mask, which one should we grab?
                ):
    df = None
    mask = infer_mask_from_init_img(init_img, mask_with='grey')
    for num in range(num_to_gen):
        filename = f'{PREFIX}_{num:05d}.png'
        gen_img = Image.open(filename)
        gen_img_rect = square_to_rect(gen_img)
        new_notes = count_notes_in_mask(gen_img, mask)
        if df is None:
            df = pd.DataFrame([[filename, new_notes, gen_img_rect]], columns=['filename', 'new_notes', 'img_rect'])
        else:
            df = pd.concat([df, pd.DataFrame([[filename, new_notes, gen_img_rect]], columns=['filename', 'new_notes', 'img_rect'])], ignore_index=True)

    # sort df by new_notes column, 
    df = df.sort_values(by='new_notes', ascending=True)
    grab_index = (len(df)-1)*busyness//100
    print("grab_index = ", grab_index)
    dense_filename = df.iloc[grab_index]['filename']
    print("Grabbing filename = ", dense_filename)
    return dense_filename

# dummy class to make an args-like object
class Args:
    def __init__(self, **kwargs):
        for key, value in kwargs.items():
            setattr(self, key, value)
    def __repr__(self):
        return f'Args({", ".join(f"{key}={value}" for key, value in self.__dict__.items())})'
    
    def __str__(self):
        return f'Args with attributes: {", ".join(f"{key}={value}" for key, value in self.__dict__.items())}'



@spaces.GPU
def process_image(image, repaint, busyness):

    # get image ready and execute sampler
    #print("image = ",image)
    image = image['composite']
    # if image is a numpy array convert to PIL 
    if isinstance(image, np.ndarray):
        image = ToPILImage()(image)
    image = image.convert("RGB").crop((0, 0, 512, 128))
    image = rect_to_square( image )
    #mask = infer_mask_from_init_img( image )
    masked_img_file = 'gradio_masked_image.png' # TODO: could allow for clobber at scale
    print("Saving masked image file to ", masked_img_file)
    image.save(masked_img_file)
    num = 64 # number of images to generate; we'll take the one with the most notes in the masked region
    bs = num
    repaint = repaint
    seed_scale = 1.0
    CT_HOME = '.'
    CKPT = f'ckpt/256_chords_00130000.pth'
    PREFIX = 'gradiodemo'
    # !echo {DEVICES} {CT_HOME} {CKPT} {PREFIX} {masked_img_file}
    print("Reading init image from ", masked_img_file,", repaint = ",repaint) 

    #  HF ZeroGPU+Gradio doesn't seem to work with subprocesses.
    use_subprocess = True 
    if use_subprocess:
        cmd = f'{sys.executable} {CT_HOME}/sample.py --batch-size {bs} --checkpoint {CKPT} --config {CT_HOME}/configs/config_pop909_256x256_chords.json -n {num} --prefix {PREFIX} --init-image {masked_img_file} --steps=100 --repaint={repaint}'    
        print("Will run command: ", cmd)
        args = cmd.split(' ')
        #call(cmd, shell=True)
        print("Calling subprocess with args = ", args,"\n")
        return_value = call(args)
        print("Subprocess finished.  Return value = ", return_value)
    else:
        accelerator = accelerate.Accelerator()
        device = accelerator.device
        print("Accelerator device = ", device)
        args = Args(batch_size=bs, checkpoint=CKPT, config=f'{CT_HOME}/configs/config_pop909_256x256_chords.json', n=num, prefix=PREFIX, init_image=masked_img_file, steps=100, seed_scale=0.0, repaint=repaint)
        print(" Now calling zero_wrapper with args = ",args,"\n")
        zero_wrapper(args, accelerator, device)

    # find gen'd image and convert to midi piano roll 
    #gen_file = f'{PREFIX}_00000.png'
    gen_file = grab_dense_gen(image, PREFIX, num_to_gen=num)
    gen_image = square_to_rect(Image.open(gen_file))
    midi_file = img_file_2_midi_file(gen_file)
    srcdoc = MIDIPlayer(midi_file, 300, styler=dark).html
    srcdoc = srcdoc.replace("\"", "'")
    html = f'''<iframe srcdoc="{srcdoc}" height="500" width="100%" title="Iframe Example"></iframe>'''


    # convert the midi to audio too 
    audio_file = 'gradio_demo_out.mp3'
    cmd = f'timidity {midi_file} -Ow -o {audio_file}'
    print("Converting midi to audio with: ", cmd)
    return_value = call(cmd.split(' '))
    print("Return value = ", return_value)

    return gen_image, html, audio_file


# for making dictionaries for gradio
make_dict = lambda x: {'background':x, 'composite':x, 'layers':[x]}


with gr.Blocks() as demo:
    gr.Markdown(
    """
    # Pictures of MIDI

    Spaces demo of "Pictures Of MIDI: Controlled Music Generation via Graphical Prompts for Image-Based Diffusion Inpainting" by Scott H. Hawley

    Paper: https://arxiv.org/abs/2407.01499

    Website with examples & more discussion: https://picturesofmidi.github.io/PicturesOfMIDI/

    ## Instructions
    Choose from the examples at the bottom, and/or select the 'draw' tool (pen with a squiggle on it) to draw shapes to inpaint with notes. 
    White denotes regions to inpaint. (In the paper we used blue.)

    ## Issues
    If you get "`Error`", then try pressing Submit again. It seems that Spaces/Gradio *intermittently* kills this demo with a "`GPU task aborted`" error. 
    """)
    with gr.Row():
        with gr.Column():
            in_img = gr.ImageEditor(sources=["upload",'clipboard'], label="Input Piano Roll Image (White = Gen Notes Here)", value=make_dict('all_black.png'), brush=gr.Brush(colors=["#FFFFFF","#000000"]))
            repaint = gr.Slider(minimum=1, maximum=10, step=1, value=2, label="RePaint (Larger = More Notes, But Crazier. Also Slower.)")
            busyness = gr.Slider(minimum=1, maximum=100, step=1, value=100, label="Busy-ness Percentile (Based on Notes Generated)")
        with gr.Column():
            out_img = gr.Image(width=512, height=128, label='Generated Piano Roll Image')
            out_midi = gr.HTML(label="MIDI Player")
            out_audio = gr.Audio(label="MIDI as Audio")

    inp = [in_img, repaint, busyness]
    out = [out_img, out_midi, out_audio]

    btn = gr.Button("Submit")
    btn.click(fn=process_image, inputs=inp, outputs=out)

    exam = gr.Examples(
                examples=#[
                    [[make_dict(y),1,100] for y in ['all_white.png','all_black.png','init_img_melody.png','init_img_accomp.png','init_img_cont.png',]]+
                    [[make_dict(x),2,100] for x in ['584_TOTAL_crop.png', '780_TOTAL_crop_bg.png', '780_TOTAL_crop_draw.png','loop_middle_2.png']]+
                    [[make_dict(z),3,100] for z in ['584_TOTAL_crop_draw.png','loop_middle.png']] + 
                    [[make_dict('pom_mask_shrunk.png'),6,100]]
                ,#], 
                fn=process_image, inputs=inp, outputs=out, examples_per_page=50, run_on_click=False, cache_examples='lazy')


# old 'Interface' version
# demo = gr.Interface(fn=process_image,
#     inputs=[gr.ImageEditor(sources=["upload",'clipboard'], label="Input Piano Roll Image (White = Gen Notes Here)", value=make_dict('all_black.png'), brush=gr.Brush(colors=["#FFFFFF","#000000"])),
#         gr.Slider(minimum=1, maximum=10, step=1, value=2, label="RePaint (Larger = More Notes, But Crazier. Also Slower.)"),
#         gr.Slider(minimum=1, maximum=100, step=1, value=100, label="Busy-ness Percentile (Based on Notes Generated)")],
#     outputs=[gr.Image(width=512, height=128, label='Generated Piano Roll Image'), 
#              gr.HTML(label="MIDI Player"),
#              gr.Audio(label="MIDI as Audio")],
#     examples=   [[make_dict(y),1,100] for y in ['all_white.png','all_black.png','init_img_melody.png','init_img_accomp.png','init_img_cont.png',]]+
#                 [[make_dict(x),2,100] for x in ['584_TOTAL_crop.png', '780_TOTAL_crop_bg.png', '780_TOTAL_crop_draw.png','loop_middle_2.png']]+
#                 [[make_dict(z),3,100] for z in ['584_TOTAL_crop_draw.png','loop_middle.png']] + 
#                 [[make_dict('ismir_mask_2.png'),6,100]],
#     )
demo.queue().launch()