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[pp/embedthumbnail] Fix postprocessor (#10248)
* [compat] Improve `imghdr.what` detection * [pp/embedthumbnail] Improve imghdr fail message * [pp/embedthumbnail] Fix AtomicParsley error handling Authored by: Grub4K
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@ -1,16 +1,22 @@
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tests = {
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'webp': lambda h: h[0:4] == b'RIFF' and h[8:] == b'WEBP',
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'png': lambda h: h[:8] == b'\211PNG\r\n\032\n',
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'jpeg': lambda h: h[6:10] in (b'JFIF', b'Exif'),
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'gif': lambda h: h[:6] in (b'GIF87a', b'GIF89a'),
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}
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def what(file=None, h=None):
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"""Detect format of image (Currently supports jpeg, png, webp, gif only)
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Ref: https://github.com/python/cpython/blob/3.10/Lib/imghdr.py
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Ref: https://github.com/python/cpython/blob/3.11/Lib/imghdr.py
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Ref: https://www.w3.org/Graphics/JPEG/itu-t81.pdf
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"""
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if h is None:
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with open(file, 'rb') as f:
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h = f.read(12)
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return next((type_ for type_, test in tests.items() if test(h)), None)
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if h.startswith(b'RIFF') and h.startswith(b'WEBP', 8):
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return 'webp'
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if h.startswith(b'\x89PNG'):
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return 'png'
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if h.startswith(b'\xFF\xD8\xFF'):
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return 'jpeg'
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if h.startswith(b'GIF'):
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return 'gif'
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return None
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@ -119,14 +119,21 @@ def run(self, info):
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if not mutagen or prefer_atomicparsley:
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success = False
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else:
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try:
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self._report_run('mutagen', filename)
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f = {'jpeg': MP4Cover.FORMAT_JPEG, 'png': MP4Cover.FORMAT_PNG}
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try:
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with open(thumbnail_filename, 'rb') as thumbfile:
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thumb_data = thumbfile.read()
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type_ = imghdr.what(h=thumb_data)
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if not type_:
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raise ValueError('could not determine image type')
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elif type_ not in f:
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raise ValueError(f'incompatible image type: {type_}')
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meta = MP4(filename)
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# NOTE: the 'covr' atom is a non-standard MPEG-4 atom,
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# Apple iTunes 'M4A' files include the 'moov.udta.meta.ilst' atom.
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f = {'jpeg': MP4Cover.FORMAT_JPEG, 'png': MP4Cover.FORMAT_PNG}[imghdr.what(thumbnail_filename)]
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with open(thumbnail_filename, 'rb') as thumbfile:
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thumb_data = thumbfile.read()
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meta.tags['covr'] = [MP4Cover(data=thumb_data, imageformat=f)]
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meta.save()
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temp_filename = filename
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@ -160,9 +167,10 @@ def run(self, info):
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stdout, stderr, returncode = Popen.run(cmd, text=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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if returncode:
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self.report_warning(f'Unable to embed thumbnails using AtomicParsley; {stderr.strip()}')
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success = False
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# for formats that don't support thumbnails (like 3gp) AtomicParsley
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# won't create to the temporary file
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if 'No changes' in stdout:
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elif 'No changes' in stdout:
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self.report_warning('The file format doesn\'t support embedding a thumbnail')
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success = False
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