import cv2 import numpy as np import torch import torchaudio from torchvision import transforms from transformers import ProcessorMixin, BatchEncoding from transformers.image_processing_utils import BatchFeature from torch.nn import functional as F def make_list_of_images(x): if not isinstance(x, list): return [x] return x # torchaudio.set_audio_backend was deprecated and later removed; it is a no-op # on modern torchaudio, so only call it when present (older versions). if hasattr(torchaudio, "set_audio_backend"): torchaudio.set_audio_backend("soundfile") def torchaudio_loader(path): return torchaudio.load(path) def int16_to_float32_torch(x): return (x / 32767.0).type(torch.float32) def float32_to_int16_torch(x): x = torch.clamp(x, min=-1., max=1.) return (x * 32767.).type(torch.int16) DEFAULT_AUDIO_FRAME_SHIFT_MS = 10 class AudioTransform: def __init__(self, args): self.sample_rate = args.audio_sample_rate self.num_mel_bins = args.num_mel_bins self.target_length = args.target_length self.audio_mean = args.audio_mean self.audio_std = args.audio_std self.mean = [] self.std = [] # mean=-4.2677393 # std=4.5689974 # self.norm = transforms.Normalize(mean=self.audio_mean, std=self.audio_std) def __call__(self, audio_data_and_origin_sr): audio_data, origin_sr = audio_data_and_origin_sr if self.sample_rate != origin_sr: # print(audio_data.shape, origin_sr) audio_data = torchaudio.functional.resample(audio_data, orig_freq=origin_sr, new_freq=self.sample_rate) waveform_melspec = self.waveform2melspec(audio_data) return waveform_melspec def waveform2melspec(self, audio_data): mel = self.get_mel(audio_data) if mel.shape[0] > self.target_length: # split to three parts chunk_frames = self.target_length total_frames = mel.shape[0] ranges = np.array_split(list(range(0, total_frames - chunk_frames + 1)), 3) # print('total_frames-chunk_frames:', total_frames-chunk_frames, # 'len(audio_data):', len(audio_data), # 'chunk_frames:', chunk_frames, # 'total_frames:', total_frames) if len(ranges[1]) == 0: # if the audio is too short, we just use the first chunk ranges[1] = [0] if len(ranges[2]) == 0: # if the audio is too short, we just use the first chunk ranges[2] = [0] # randomly choose index for each part idx_front = np.random.choice(ranges[0]) idx_middle = np.random.choice(ranges[1]) idx_back = np.random.choice(ranges[2]) # idx_front = ranges[0][0] # fixed # idx_middle = ranges[1][0] # idx_back = ranges[2][0] # select mel mel_chunk_front = mel[idx_front:idx_front + chunk_frames, :] mel_chunk_middle = mel[idx_middle:idx_middle + chunk_frames, :] mel_chunk_back = mel[idx_back:idx_back + chunk_frames, :] # print(total_frames, idx_front, idx_front + chunk_frames, idx_middle, idx_middle + chunk_frames, idx_back, idx_back + chunk_frames) # stack mel_fusion = torch.stack([mel_chunk_front, mel_chunk_middle, mel_chunk_back], dim=0) elif mel.shape[0] < self.target_length: # padding if too short n_repeat = int(self.target_length / mel.shape[0]) + 1 # print(self.target_length, mel.shape[0], n_repeat) mel = mel.repeat(n_repeat, 1)[:self.target_length, :] mel_fusion = torch.stack([mel, mel, mel], dim=0) else: # if equal mel_fusion = torch.stack([mel, mel, mel], dim=0) mel_fusion = mel_fusion.transpose(1, 2) # [3, target_length, mel_bins] -> [3, mel_bins, target_length] # self.mean.append(mel_fusion.mean()) # self.std.append(mel_fusion.std()) mel_fusion = (mel_fusion - self.audio_mean) / (self.audio_std * 2) return mel_fusion def get_mel(self, audio_data): # mel shape: (n_mels, T) audio_data -= audio_data.mean() mel = torchaudio.compliance.kaldi.fbank( audio_data, htk_compat=True, sample_frequency=self.sample_rate, use_energy=False, window_type="hanning", num_mel_bins=self.num_mel_bins, dither=0.0, frame_length=25, frame_shift=DEFAULT_AUDIO_FRAME_SHIFT_MS, ) return mel # (T, n_mels) def get_audio_transform(config): config = config.vision_config return AudioTransform(config) def load_and_transform_audio( audio_path, transform, ): waveform_and_sr = torchaudio_loader(audio_path) audio_outputs = transform(waveform_and_sr) return audio_outputs class LanguageBindAudioProcessor(ProcessorMixin): attributes = [] tokenizer_class = ("LanguageBindAudioTokenizer") def __init__(self, config, tokenizer=None, **kwargs): super().__init__(**kwargs) self.config = config self.transform = get_audio_transform(config) self.image_processor = load_and_transform_audio self.tokenizer = tokenizer def __call__(self, images=None, text=None, context_length=77, return_tensors=None, **kwargs): if text is None and images is None: raise ValueError("You have to specify either text or images. Both cannot be none.") if text is not None: encoding = self.tokenizer(text, max_length=context_length, padding='max_length', truncation=True, return_tensors=return_tensors, **kwargs) if images is not None: images = make_list_of_images(images) image_features = [self.image_processor(image, self.transform) for image in images] image_features = torch.stack(image_features) if text is not None and images is not None: encoding["pixel_values"] = image_features return encoding elif text is not None: return encoding else: return {"pixel_values": image_features} def batch_decode(self, skip_special_tokens=True, *args, **kwargs): """ This method forwards all its arguments to CLIPTokenizerFast's [`~PreTrainedTokenizer.batch_decode`]. Please refer to the docstring of this method for more information. """ return self.tokenizer.batch_decode(*args, skip_special_tokens=skip_special_tokens, **kwargs) def decode(self, skip_special_tokens=True, *args, **kwargs): """ This method forwards all its arguments to CLIPTokenizerFast's [`~PreTrainedTokenizer.decode`]. Please refer to the docstring of this method for more information. """ return self.tokenizer.decode(*args, skip_special_tokens=skip_special_tokens, **kwargs)