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Some minor fixes and refactoring (see desc) 

* [utils] Fix issues with reversal
* check_formats should catch `DownloadError`, not `ExtractorError`
* Simplify format selectors with `LazyList` and `yield from`
This commit is contained in:
pukkandan 2021-06-27 07:35:58 +05:30
parent b1e60d1806
commit 981052c9c6
3 changed files with 38 additions and 44 deletions
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8
test/test_utils.py
View File

@ -1545,8 +1545,8 @@ Line 1
self.assertEqual(repr(LazyList(it)), repr(it))
self.assertEqual(str(LazyList(it)), str(it))
self.assertEqual(list(reversed(LazyList(it))), it[::-1])
self.assertEqual(list(reversed(LazyList(it))[1:3:7]), it[::-1][1:3:7])
self.assertEqual(list(LazyList(it).reverse()), it[::-1])
self.assertEqual(list(LazyList(it).reverse()[1:3:7]), it[::-1][1:3:7])
def test_LazyList_laziness(self):
@ -1559,13 +1559,13 @@ Line 1
test(ll, 5, 5, range(6))
test(ll, -3, 7, range(10))
ll = reversed(LazyList(range(10)))
ll = LazyList(range(10)).reverse()
test(ll, -1, 0, range(1))
test(ll, 3, 6, range(10))
ll = LazyList(itertools.count())
test(ll, 10, 10, range(11))
reversed(ll)
ll.reverse()
test(ll, -15, 14, range(15))

55
yt_dlp/YoutubeDL.py
View File

@ -1758,6 +1758,8 @@ class YoutubeDL(object):
return new_dict
def _check_formats(formats):
if not check_formats:
yield from formats
for f in formats:
self.to_screen('[info] Testing format %s' % f['format_id'])
temp_file = tempfile.NamedTemporaryFile(
@ -1765,16 +1767,16 @@ class YoutubeDL(object):
dir=self.get_output_path('temp') or None)
temp_file.close()
try:
dl, _ = self.dl(temp_file.name, f, test=True)
except (ExtractorError, IOError, OSError, ValueError) + network_exceptions:
dl = False
success, _ = self.dl(temp_file.name, f, test=True)
except (DownloadError, IOError, OSError, ValueError) + network_exceptions:
success = False
finally:
if os.path.exists(temp_file.name):
try:
os.remove(temp_file.name)
except OSError:
self.report_warning('Unable to delete temporary file "%s"' % temp_file.name)
if dl:
if success:
yield f
else:
self.to_screen('[info] Unable to download format %s. Skipping...' % f['format_id'])
@ -1785,8 +1787,7 @@ class YoutubeDL(object):
def selector_function(ctx):
for f in fs:
for format in f(ctx):
yield format
yield from f(ctx)
return selector_function
elif selector.type == GROUP: # ()
@ -1802,22 +1803,24 @@ class YoutubeDL(object):
return picked_formats
return []
elif selector.type == MERGE: # +
selector_1, selector_2 = map(_build_selector_function, selector.selector)
def selector_function(ctx):
for pair in itertools.product(
selector_1(copy.deepcopy(ctx)), selector_2(copy.deepcopy(ctx))):
yield _merge(pair)
elif selector.type == SINGLE: # atom
format_spec = selector.selector or 'best'
# TODO: Add allvideo, allaudio etc by generalizing the code with best/worst selector
if format_spec == 'all':
def selector_function(ctx):
formats = list(ctx['formats'])
if check_formats:
formats = _check_formats(formats)
for f in formats:
yield f
yield from _check_formats(ctx['formats'])
elif format_spec == 'mergeall':
def selector_function(ctx):
formats = ctx['formats']
if check_formats:
formats = list(_check_formats(formats))
formats = list(_check_formats(ctx['formats']))
if not formats:
return
merged_format = formats[-1]
@ -1855,29 +1858,17 @@ class YoutubeDL(object):
def selector_function(ctx):
formats = list(ctx['formats'])
if not formats:
return
matches = list(filter(filter_f, formats)) if filter_f is not None else formats
if format_fallback and ctx['incomplete_formats'] and not matches:
# for extractors with incomplete formats (audio only (soundcloud)
# or video only (imgur)) best/worst will fallback to
# best/worst {video,audio}-only format
matches = formats
if format_reverse:
matches = matches[::-1]
if check_formats:
matches = list(itertools.islice(_check_formats(matches), format_idx))
n = len(matches)
if -n <= format_idx - 1 < n:
matches = LazyList(_check_formats(matches[::-1 if format_reverse else 1]))
try:
yield matches[format_idx - 1]
elif selector.type == MERGE: # +
selector_1, selector_2 = map(_build_selector_function, selector.selector)
def selector_function(ctx):
for pair in itertools.product(
selector_1(copy.deepcopy(ctx)), selector_2(copy.deepcopy(ctx))):
yield _merge(pair)
except IndexError:
return
filters = [self._build_format_filter(f) for f in selector.filters]
@ -1971,7 +1962,7 @@ class YoutubeDL(object):
t['resolution'] = '%dx%d' % (t['width'], t['height'])
t['url'] = sanitize_url(t['url'])
if self.params.get('check_formats'):
info_dict['thumbnails'] = reversed(LazyList(filter(test_thumbnail, thumbnails[::-1])))
info_dict['thumbnails'] = LazyList(filter(test_thumbnail, thumbnails[::-1])).reverse()
def process_video_result(self, info_dict, download=True):
assert info_dict.get('_type', 'video') == 'video'
@ -3267,7 +3258,7 @@ class YoutubeDL(object):
multiple = write_all and len(thumbnails) > 1
ret = []
for t in thumbnails[::1 if write_all else -1]:
for t in thumbnails[::-1]:
thumb_ext = determine_ext(t['url'], 'jpg')
suffix = '%s.' % t['id'] if multiple else ''
thumb_display_id = '%s ' % t['id'] if multiple else ''

19
yt_dlp/utils.py
View File

@ -3976,20 +3976,23 @@ class LazyList(collections.Sequence):
def __iter__(self):
if self.__reversed:
# We need to consume the entire iterable to iterate in reverse
yield from self.exhaust()[::-1]
yield from self.exhaust()
return
yield from self.__cache
for item in self.__iterable:
self.__cache.append(item)
yield item
def exhaust(self):
''' Evaluate the entire iterable '''
def __exhaust(self):
self.__cache.extend(self.__iterable)
return self.__cache
def exhaust(self):
''' Evaluate the entire iterable '''
return self.__exhaust()[::-1 if self.__reversed else 1]
@staticmethod
def _reverse_index(x):
def __reverse_index(x):
return -(x + 1)
def __getitem__(self, idx):
@ -3998,18 +4001,18 @@ class LazyList(collections.Sequence):
start = idx.start if idx.start is not None else 0 if step > 0 else -1
stop = idx.stop if idx.stop is not None else -1 if step > 0 else 0
if self.__reversed:
start, stop, step = map(self._reverse_index, (start, stop, step))
(start, stop), step = map(self.__reverse_index, (start, stop)), -step
idx = slice(start, stop, step)
elif isinstance(idx, int):
if self.__reversed:
idx = self._reverse_index(idx)
idx = self.__reverse_index(idx)
start = stop = idx
else:
raise TypeError('indices must be integers or slices')
if start < 0 or stop < 0:
# We need to consume the entire iterable to be able to slice from the end
# Obviously, never use this with infinite iterables
return self.exhaust()[idx]
return self.__exhaust()[idx]
n = max(start, stop) - len(self.__cache) + 1
if n > 0:
@ -4027,7 +4030,7 @@ class LazyList(collections.Sequence):
self.exhaust()
return len(self.__cache)
def __reversed__(self):
def reverse(self):
self.__reversed = not self.__reversed
return self