Some improvements were added to Utils.py and YoutubeDL.py

youtube_dl/YoutubeDL.py

@@ -2371,60 +2371,38 @@ class YoutubeDL(object):
         return res
 
     def _format_note(self, fdict):
-        res = ''
+        note_parts = []
-        if fdict.get('ext') in ['f4f', 'f4m']:
+        if fdict.get('ext') in ('f4f', 'f4m'):
-            res += '(unsupported) '
+            note_parts.append('(unsupported)')
         if fdict.get('language'):
-            if res:
+            note_parts.append(f'[{fdict["language"]}]')
-                res += ' '
+        if fdict.get('format_note'):
-            res += '[%s] ' % fdict['language']
+            note_parts.append(fdict['format_note'])
-        if fdict.get('format_note') is not None:
-            res += fdict['format_note'] + ' '
         if fdict.get('tbr') is not None:
-            res += '%4dk ' % fdict['tbr']
+            note_parts.append('%4dk' % fdict['tbr'])
         if fdict.get('container') is not None:
-            if res:
+            note_parts.append('%s container' % fdict['container'])
-                res += ', '
+        if fdict.get('vcodec') not in (None, 'none'):
-            res += '%s container' % fdict['container']
+            note_parts.append(fdict['vcodec'] + ('@' if fdict.get('vbr') else ''))
-        if (fdict.get('vcodec') is not None
+        elif fdict.get('vbr') is not None:
-                and fdict.get('vcodec') != 'none'):
+            note_parts.append('video@')
-            if res:
-                res += ', '
-            res += fdict['vcodec']
-            if fdict.get('vbr') is not None:
-                res += '@'
-        elif fdict.get('vbr') is not None and fdict.get('abr') is not None:
-            res += 'video@'
         if fdict.get('vbr') is not None:
-            res += '%4dk' % fdict['vbr']
+            note_parts.append('%4dk' % fdict['vbr'])
         if fdict.get('fps') is not None:
-            if res:
+            note_parts.append('%sfps' % fdict['fps'])
-                res += ', '
-            res += '%sfps' % fdict['fps']
         if fdict.get('acodec') is not None:
-            if res:
+            note_parts.append('video only' if fdict['acodec'] == 'none' else '%-5s' % fdict['acodec'])
-                res += ', '
-            if fdict['acodec'] == 'none':
-                res += 'video only'
-            else:
-                res += '%-5s' % fdict['acodec']
         elif fdict.get('abr') is not None:
-            if res:
+            note_parts.append('audio')
-                res += ', '
-            res += 'audio'
         if fdict.get('abr') is not None:
-            res += '@%3dk' % fdict['abr']
+            note_parts.append('@%3dk' % fdict['abr'])
         if fdict.get('asr') is not None:
-            res += ' (%5dHz)' % fdict['asr']
+            note_parts.append('(%5dHz)' % fdict['asr'])
         if fdict.get('filesize') is not None:
-            if res:
+            note_parts.append(format_bytes(fdict['filesize']))
-                res += ', '
-            res += format_bytes(fdict['filesize'])
         elif fdict.get('filesize_approx') is not None:
-            if res:
+            note_parts.append('~' + format_bytes(fdict['filesize_approx']))
-                res += ', '
+        return ' '.join(note_parts)
-            res += '~' + format_bytes(fdict['filesize_approx'])
-        return res
 
     def list_formats(self, info_dict):
         formats = info_dict.get('formats', [info_dict])

youtube_dl/utils.py

@@ -6002,114 +6002,63 @@ def parse_m3u8_attributes(attrib):
 def urshift(val, n):
     return val >> n if val >= 0 else (val + 0x100000000) >> n
 
-
 # Based on png2str() written by @gdkchan and improved by @yokrysty
 # Originally posted at https://github.com/ytdl-org/youtube-dl/issues/9706
 def decode_png(png_data):
     # Reference: https://www.w3.org/TR/PNG/
-    header = png_data[8:]
+    if png_data[:8] != b'\x89PNG\x0d\x0a\x1a\x0a':
-
-    if png_data[:8] != b'\x89PNG\x0d\x0a\x1a\x0a' or header[4:8] != b'IHDR':
         raise IOError('Not a valid PNG file.')
 
-    int_map = {1: '>B', 2: '>H', 4: '>I'}
+    def unpack_integer(data):
-    unpack_integer = lambda x: compat_struct_unpack(int_map[len(x)], x)[0]
+        return compat_struct_unpack(f'>{int_map[len(data)]}', data)[0]
 
+    int_map = {1: 'B', 2: 'H', 4: 'I'}
+    header = png_data[8:]
     chunks = []
 
     while header:
         length = unpack_integer(header[:4])
-        header = header[4:]
+        chunk_type, chunk_data, header = header[4:8], header[8:8 + length], header[8 + length + 4:]
+        chunks.append({'type': chunk_type, 'data': chunk_data})
 
-        chunk_type = header[:4]
+    if not (ihdr := next((c["data"] for c in chunks if c["type"] == b'IHDR'), None)):
-        header = header[4:]
+        raise IOError("Unable to read PNG header.")
 
-        chunk_data = header[:length]
+    width, height = unpack_integer(ihdr[:4]), unpack_integer(ihdr[4:8])
-        header = header[length:]
+    idat = b''.join(c['data'] for c in chunks if c['type'] == b'IDAT')
-
-        header = header[4:]  # Skip CRC
-
-        chunks.append({
-            'type': chunk_type,
-            'length': length,
-            'data': chunk_data
-        })
-
-    ihdr = chunks[0]['data']
-
-    width = unpack_integer(ihdr[:4])
-    height = unpack_integer(ihdr[4:8])
-
-    idat = b''
-
-    for chunk in chunks:
-        if chunk['type'] == b'IDAT':
-            idat += chunk['data']
 
     if not idat:
         raise IOError('Unable to read PNG data.')
 
     decompressed_data = bytearray(zlib.decompress(idat))
-
     stride = width * 3
-    pixels = []
+    pixels = [[] for _ in range(height)]
     
-    def _get_pixel(idx):
+    def _get_pixel(x, y):
-        x = idx % stride
+        return pixels[y][x] if x >= 0 and y >= 0 else 0
-        y = idx // stride
-        return pixels[y][x]
 
     for y in range(height):
-        basePos = y * (1 + stride)
+        filter_type = decompressed_data[y * (1 + stride)]
-        filter_type = decompressed_data[basePos]
-
-        current_row = []
-
-        pixels.append(current_row)
-
         for x in range(stride):
-            color = decompressed_data[1 + basePos + x]
+            color = decompressed_data[1 + y * (1 + stride) + x]
-            basex = y * stride + x
+            left, up = _get_pixel(x - 3, y), _get_pixel(x, y - 1)
-            left = 0
-            up = 0
 
-            if x > 2:
+            if filter_type == 1:   # Sub
-                left = _get_pixel(basex - 3)
-            if y > 0:
-                up = _get_pixel(basex - stride)
-
-            if filter_type == 1:  # Sub
                 color = (color + left) & 0xff
-            elif filter_type == 2:  # Up
+            elif filter_type == 2: # Up
                 color = (color + up) & 0xff
-            elif filter_type == 3:  # Average
+            elif filter_type == 3: # Average
                 color = (color + ((left + up) >> 1)) & 0xff
-            elif filter_type == 4:  # Paeth
+            elif filter_type == 4: # Paeth
-                a = left
+                a, b, c = left, up, _get_pixel(x - 3, y - 1)
-                b = up
-                c = 0
-
-                if x > 2 and y > 0:
-                    c = _get_pixel(basex - stride - 3)
-
                 p = a + b - c
+                pa, pb, pc = abs(p - a), abs(p - b), abs(p - c)
+                color = (color + (a if pa <= pb and pa <= pc else b if pb <= pc else c)) & 0xff
             
-                pa = abs(p - a)
+            pixels[y].append(color)
-                pb = abs(p - b)
-                pc = abs(p - c)
-
-                if pa <= pb and pa <= pc:
-                    color = (color + a) & 0xff
-                elif pb <= pc:
-                    color = (color + b) & 0xff
-                else:
-                    color = (color + c) & 0xff
-
-            current_row.append(color)
 
     return width, height, pixels
 
-
 def write_xattr(path, key, value):
     # This mess below finds the best xattr tool for the job
     try: