fix sampling bugs

enhancer/data/vctk.py

@@ -1,18 +1,37 @@
 
 import glob
 import math
+import numpy as np
 import os
 from scipy.io import wavfile
 from torch.utils.data import IterableDataset
+import torch.nn.functional as F
 
 from enhancer.utils.random import create_unique_rng
 from enhancer.utils.io import Audio
 
 
+
+class VctkDataset:
+
+    def __init__(self):
+        pass
+
+    def train_loader(self):
+        pass
+
+    def valid_loader(self):
+        pass
+
+    def test_loader(self):
+        pass
+
+
+
 class Vctk(IterableDataset):
     """Dataset object for Voice Bank Corpus (VCTK) Dataset"""
 
-    def __init__(self,clean_path,noisy_path,duration=1,sampling_rate=16000,num_samples=None):
+    def __init__(self,clean_path,noisy_path,duration=1.0,sampling_rate=48000):
         
         if not os.path.isdir(clean_path):
             raise ValueError(f"{clean_path} is not a valid directory")
@@ -23,46 +42,50 @@ class Vctk(IterableDataset):
         self.sampling_rate = sampling_rate
         self.clean_path = clean_path
         self.noisy_path = noisy_path
-        self.wav_samples =[file.split('/')[-1] for file in glob.glob(os.path.join(clean_path,"*.wav"))]
-
-        if num_samples is None:
-            self.num_samples = len(self.wav_samples)
-        else:
-            self.num_samples = num_samples
-
+        self.files_duration = self.get_matching_files_duration()
+        self.wav_samples = list(self.files_duration.keys())
         self.duration = max(1.0,duration)
         self.audio = Audio(self.sampling_rate,mono=True,return_tensor=True)
-        self.files_duration = self.get_files_duration()
 
-    def get_file_duration(self):
+    def get_matching_files_duration(self):
 
-        files_duration = {}
-        for file in self.clean_path:
-            wavfile = wavfile.read(os.path.join(self.clean_path,file),rate=self.sampling_rate)
-            files_duration.update({file:math.ceil(wavfile/self.sampling_rate)})
+        matching_wavfiles_dur = dict()
+        clean_filenames = [file.split('/')[-1] for file in glob.glob(os.path.join(self.clean_path,"*.wav"))]
+        noisy_filenames = [file.split('/')[-1] for file in glob.glob(os.path.join(self.noisy_path,"*.wav"))]
+        common_filenames = np.intersect1d(noisy_filenames,clean_filenames)
 
-        return files_duration
+        for file_name in common_filenames:
 
+             sr_clean, clean_file = wavfile.read(os.path.join(self.clean_path,file_name))
+             sr_noisy, noisy_file = wavfile.read(os.path.join(self.noisy_path,file_name))
+             if ((clean_file.shape[-1]==noisy_file.shape[-1]) and 
+                    (sr_clean==self.sampling_rate) and 
+                        (sr_noisy==self.sampling_rate)):
+                matching_wavfiles_dur.update({file_name:(clean_file.shape[-1]/self.sampling_rate)})
+
+        return matching_wavfiles_dur
 
     def __iter__(self):
 
         rng = create_unique_rng(12) ##pass epoch number here
-
+        
         while True:
 
-            file_name = rng.choices(self.wav_samples,k=1)
+            file_name,*_ = rng.choices(self.wav_samples,k=1,
+                        weights=[self.files_duration[file] for file in self.wav_samples])
             file_duration = self.files_duration.get(file_name)
-            start_time = rng.randint(0,math.ceil(file_duration- self.duration))
+            start_time = round(rng.uniform(0,file_duration- self.duration),2)
             data = self.prepare_segment(file_name,start_time)
             yield data
 
-    def prepare_segment(self,file_name:str, start_time:int):
+    def prepare_segment(self,file_name:str, start_time:float):
 
         clean_segment = self.audio(os.path.join(self.clean_path,file_name),
                                     offset=start_time,duration=self.duration)
         noisy_segment = self.audio(os.path.join(self.noisy_path,file_name),
                                     offset=start_time,duration=self.duration)
-
+        clean_segment = F.pad(clean_segment,(0,int(self.duration*self.sampling_rate-clean_segment.shape[-1])))
+        noisy_segment = F.pad(noisy_segment,(0,int(self.duration*self.sampling_rate-noisy_segment.shape[-1])))
         return {"clean": clean_segment,"noisy":noisy_segment}
         
     def __len__(self):