detector_codes/C2P-CLIP-DeepfakeDetection-main/data/datasets.py

import cv2
import numpy as np
import torchvision.datasets as datasets
import torchvision.transforms as transforms
import torchvision.transforms.functional as TF
from random import random, choice
from io import BytesIO
from PIL import Image
from PIL import ImageFile
from scipy.ndimage.filters import gaussian_filter
from torchvision.transforms import InterpolationMode
from typing import Any, Callable, cast, Dict, List, Optional, Tuple
import os
from transformers import AutoTokenizer

ImageFile.LOAD_TRUNCATED_IMAGES = True
IMG_EXTENSIONS = (".jpg", ".jpeg", ".png", ".ppm", ".bmp", ".pgm", ".tif", ".tiff", ".webp")

def pil_loader(path: str) -> Image.Image:
    # open path as file to avoid ResourceWarning (https://github.com/python-pillow/Pillow/issues/835)
    with open(path, "rb") as f:
        img = Image.open(f)
        return img.convert("RGB")
        
class ImageFolder2(datasets.DatasetFolder):
    def __init__(
        self,
        root: str,
        opt,
        transform: Optional[Callable] = None,
    ):
        super().__init__(
            root,
            transform=transform,
            extensions=IMG_EXTENSIONS,
            loader = pil_loader
        )
        self.opt = opt
        self.tokenizer    = AutoTokenizer.from_pretrained(self.opt.clip, model_max_length=77, padding_side="right", use_fast=False)
        self.tokenizer.pad_token_id = 0

    def __getitem__(self, index: int) -> Tuple[Any, Any]:
        """
        Args:
            index (int): Index

        Returns:
            tuple: (sample, target) where target is class_index of the target class.
        """
        path, target = self.samples[index]

        
        textpath = path.replace(self.opt.imgroot, self.opt.textroot)
        textpath = os.path.splitext(textpath)[0] + '.txt'

        sample = self.loader(path)
        try:
            with open(textpath, 'r') as file:
                text = file.read()
            cates_len = len(self.opt.cates)//2
            if target == 1: text = f'{" ".join(self.opt.cates[:cates_len])}. {text} {" ".join(self.opt.cates[:cates_len])}.'
            if target == 0: text = f'{" ".join(self.opt.cates[cates_len:])}. {text} {" ".join(self.opt.cates[cates_len:])}.'
            inputs = self.tokenizer([text], padding="max_length", max_length=self.tokenizer.model_max_length, truncation=True, return_tensors="pt")
            input_ids=inputs['input_ids'][0]
            attention_mask=inputs['attention_mask'][0]
        except:
            text, input_ids, attention_mask = ' ', ' ', ' '

        if self.transform is not None:
            sample = self.transform(sample)
        if self.target_transform is not None:
            target = self.target_transform(target)

        return path, sample, text, input_ids, attention_mask, target

        
def dataset_folder(opt, root):
    if opt.mode == 'binary':
        return binary_dataset(opt, root)
    if opt.mode == 'filename':
        return FileNameDataset(opt, root)
    raise ValueError('opt.mode needs to be binary or filename.')


def binary_dataset(opt, root):
    if opt.isTrain:
        crop_func = transforms.RandomCrop(opt.cropSize)
    elif opt.no_crop:
        crop_func = transforms.Lambda(lambda img: img)
    else:
        crop_func = transforms.CenterCrop(opt.cropSize)

    if opt.isTrain and not opt.no_flip:
        flip_func = transforms.RandomHorizontalFlip()
    else:
        flip_func = transforms.Lambda(lambda img: img)
        
    if not opt.isTrain and opt.no_resize:
        rz_func = transforms.Lambda(lambda img: img)
    else:
        rz_func = transforms.Lambda(lambda img: translate_duplicate(img, opt.cropSize))

    dset = ImageFolder2(
            root,
            opt,
            transforms.Compose([
                rz_func,
                crop_func,
                flip_func,
                transforms.ToTensor(),
                transforms.Normalize(mean=[0.48145466, 0.4578275, 0.40821073], std=[0.26862954, 0.26130258, 0.27577711]),
            ]))
    return dset


class FileNameDataset(datasets.ImageFolder):
    def name(self):
        return 'FileNameDataset'

    def __init__(self, opt, root):
        self.opt = opt
        super().__init__(root)

    def __getitem__(self, index):
        # Loading sample
        path, target = self.samples[index]
        return path


import math
def translate_duplicate(img, cropSize):
    if min(img.size) < cropSize:
        width, height = img.size
        
        new_width = width * math.ceil(cropSize/width)
        new_height = height * math.ceil(cropSize/height)
        
        new_img = Image.new('RGB', (new_width, new_height))
        for i in range(0, new_width, width):
            for j in range(0, new_height, height):
                new_img.paste(img, (i, j))
        return new_img
    else:
        return img

def data_augment(img, opt):
    img = np.array(img)

    if random() < opt.blur_prob:
        sig = sample_continuous(opt.blur_sig)
        gaussian_blur(img, sig)

    if random() < opt.jpg_prob:
        method = sample_discrete(opt.jpg_method)
        qual = sample_discrete(opt.jpg_qual)
        img = jpeg_from_key(img, qual, method)

    return Image.fromarray(img)


def sample_continuous(s):
    if len(s) == 1:
        return s[0]
    if len(s) == 2:
        rg = s[1] - s[0]
        return random() * rg + s[0]
    raise ValueError("Length of iterable s should be 1 or 2.")


def sample_discrete(s):
    if len(s) == 1:
        return s[0]
    return choice(s)


def gaussian_blur(img, sigma):
    gaussian_filter(img[:,:,0], output=img[:,:,0], sigma=sigma)
    gaussian_filter(img[:,:,1], output=img[:,:,1], sigma=sigma)
    gaussian_filter(img[:,:,2], output=img[:,:,2], sigma=sigma)


def cv2_jpg(img, compress_val):
    img_cv2 = img[:,:,::-1]
    encode_param = [int(cv2.IMWRITE_JPEG_QUALITY), compress_val]
    result, encimg = cv2.imencode('.jpg', img_cv2, encode_param)
    decimg = cv2.imdecode(encimg, 1)
    return decimg[:,:,::-1]


def pil_jpg(img, compress_val):
    out = BytesIO()
    img = Image.fromarray(img)
    img.save(out, format='jpeg', quality=compress_val)
    img = Image.open(out)
    # load from memory before ByteIO closes
    img = np.array(img)
    out.close()
    return img


jpeg_dict = {'cv2': cv2_jpg, 'pil': pil_jpg}
def jpeg_from_key(img, compress_val, key):
    method = jpeg_dict[key]
    return method(img, compress_val)


rz_dict = {'bilinear': InterpolationMode.BILINEAR,
           'bicubic': InterpolationMode.BICUBIC,
           'lanczos': InterpolationMode.LANCZOS,
           'nearest': InterpolationMode.NEAREST}
def custom_resize(img, opt):
    interp = sample_discrete(opt.rz_interp)
    return TF.resize(img, opt.loadSize, interpolation=rz_dict[interp])