python-ebml/test/test_container.py at master · python-ffmpegio/python-ebml · GitHub

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#pylint: disable=too-many-locals,no-self-use

#pylint: disable=too-many-public-methods,too-many-statements

"""

Element container tests.

"""

from .test import EbmlTest, UNK_ID

__all__ = ['ContainerTest']

class ContainerTest(EbmlTest):

"Container tests."

def make_test_container(self):

"""Return a container with elements from 5--10, 16--25, 33--40.

The middle element is shrinkable to size 5.

"""

from ebml.element import ElementMaster, ElementUnsupported, ElementVoid

from ebml.atomic import ElementString

elt = ElementMaster.new(UNK_ID)

ElementVoid.of_size(5, elt, 0)

ElementUnsupported.of_size(UNK_ID, 5, elt, 5)

ElementVoid.of_size(6, elt, 10)

ElementString.new_with_value(UNK_ID, '', elt, 16).resize_total(9)

ElementVoid.of_size(8, elt, 25)

ElementUnsupported.of_size(UNK_ID, 7, elt, 33)

ElementVoid.of_size(8, elt, 40)

elt.resize(48)

return elt

def check_child_pos(self, elt, *positions):

"Check elements have the specified start and end positions."

children = iter(elt)

prev_child = None

for start in positions:

try:

child = next(children)

except StopIteration:

child = None

if prev_child is not None:

self.assertEqual(prev_child.pos_end_relative, start)

if child is not None:

self.assertEqual(child.pos_relative, start)

prev_child = child

self.assertEqual(len(positions), len(elt) + 1)

def test_1_containers(self):

"Test Container methods."

from ebml import Inconsistent

from ebml.element import ElementVoid, ElementMaster, ElementUnsupported

from ebml.atomic import ElementString, ElementUnicode

from ebml.tags import MATROSKA_TAGS

ebmlf = self.read_file_data()

seg = ebmlf[1]

elt = self.track_entry_elt(ebmlf)

# Test end_last_child

self.assertEqual(elt.end_last_child, elt.size)

# Two elements starting at the same final position

void = ElementVoid.of_size(20, elt, elt[-1].pos_relative)

self.assertEqual(elt.end_last_child, void.pos_end_relative)

elt.remove_child(void)

# Test children_named, children_with_id

self.assertEqual(list(seg.children_named('SeekHead')),

[seg[0], seg[2], seg[10], seg[12]])

ebml_id = MATROSKA_TAGS['Void'].ebml_id

self.assertEqual(list(seg.children_with_id(ebml_id)),

[seg[1], seg[7]])

# Test children_in_region

children = seg.children_in_region(seg[-1].pos_relative + 1)

self.assertEqual(list(children), [])

children = seg.children_in_region(seg[-2].pos_relative)

self.assertEqual(list(children), seg[-2:])

children = seg.children_in_region(seg[-2].pos_relative-1)

self.assertEqual(list(children), seg[-2:])

children = seg.children_in_region(seg[1].pos_relative,

seg[1].total_size)

self.assertEqual(list(children), seg[1:2])

children = seg.children_in_region(seg[1].pos_relative,

seg[1].total_size+1)

self.assertEqual(list(children), seg[1:3])

children = seg.children_in_region(seg[-2].pos_relative, 1000)

self.assertEqual(list(children), seg[-2:])

children = seg.children_in_region(0, seg[3].pos_relative, novoids=True)

self.assertEqual(list(children), [seg[0], seg[2]])

# Test adding and moving children

void = ElementVoid.of_size(20)

old_end = seg.end_last_child

seg.add_child(void)

self.assertIs(void.parent, seg)

self.assertEqual(void.pos_relative, old_end)

seg.remove_child(void)

seg.add_child(void, 3)

self.assertEqual(void.pos_relative, 3)

seg.remove_child(void)

elt = seg[3]

seg.move_child(elt, 3)

self.assertEqual(elt.pos_relative, 3)

self.assertIs(seg[1], elt)

seg.move_child(1, 24)

self.assertEqual(elt.pos_relative, 24)

self.assertIs(seg[2], elt)

# Test find_gap()

elt = ElementMaster.new(UNK_ID)

# No children

#self.assertEqual(elt.find_gap(100), (0, MAX_DATA_SIZE, None))

self.assertEqual(elt.find_gap(100), None)

self.assertEqual(elt.find_gap(100, region_size=150), (0, 150, None))

self.assertEqual(elt.find_gap(100, region_size=50), None)

ElementUnsupported.of_size(UNK_ID, 20, elt, 5)

elt1 = ElementString.new_with_value(UNK_ID, 'abcde', elt, 31)

elt1.resize_total(20)

# gaps: 0--5, 25--31, 51--

self.assertEqual(elt.find_gap(100, start=51, region_size=150),

(51, 150, None))

# Gap at beginning

self.assertEqual(elt.find_gap(5), (0, 5, None))

self.assertEqual(elt.find_gap(5, start=25), None)

self.assertEqual(elt.find_gap(5, start=25, region_size=35),

(51, 9, elt[1]))

self.assertEqual(elt.find_gap(5, start=25, one_byte_ok=True),

(25, 6, None))

# Gap in the middle

self.assertEqual(elt.find_gap(6), (25, 6, elt[0]))

self.assertEqual(elt.find_gap(5), (0, 5, None))

# Gap at the end

self.assertEqual(elt.find_gap(4, region_size=55), (51, 4, elt[1]))

self.assertEqual(elt.find_gap(7), None)

self.assertEqual(elt.find_gap(7, region_size=60), (51, 9, elt[1]))

# No solution

self.assertEqual(elt.find_gap(7, region_size=57), None)

self.assertEqual(elt.find_gap(7, region_size=59), None)

self.assertEqual(elt.find_gap(7, region_size=58),

(51, 7, elt[1]))

# Several gaps: 0--5, 25--31, 51--55, 75--

ElementUnsupported.of_size(UNK_ID, 20, elt, 55)

self.assertEqual(elt.find_gap(3), (0, 5, None))

self.assertEqual(elt.find_gap(3, one_byte_ok=True), (51, 4, elt[1]))

self.assertEqual(elt.find_gap(4), (51, 4, elt[1]))

self.assertEqual(elt.find_gap(5), (0, 5, None))

self.assertEqual(elt.find_gap(5, start=10, one_byte_ok=True),

(25, 6, elt[0]))

self.assertEqual(elt.find_gap(6), (25, 6, elt[0]))

self.assertEqual(elt.find_gap(7), None)

self.assertEqual(elt.find_gap(7, region_size=100), (75, 25, elt[2]))

# Shrinking child: gaps 0--5, 25--31, 41--55, 75--

self.assertEqual(elt.find_gap(4, shrink=True, one_byte_ok=True),

(0, 5, None))

self.assertEqual(elt.find_gap(6, shrink=True), (25, 6, elt[0]))

self.assertEqual(elt.find_gap(7, shrink=True), (41, 14, elt[1]))

self.assertEqual(elt.find_gap(14, shrink=True), (41, 14, elt[1]))

self.assertEqual(elt.find_gap(15, region_size=100, shrink=True),

(75, 25, elt[2]))

# Test place_child()

# No shrink necessary

elt = self.make_test_container()

child = ElementVoid.of_size(3)

elt.place_child(child, shrink_child=False, shrink_previous=False,

grow_child=False)

self.assertEqual((child.pos_relative, child.total_size), (0, 3))

elt = self.make_test_container()

child = ElementVoid.of_size(4)

elt.place_child(child, shrink_child=False, shrink_previous=False,

grow_child=False)

self.assertEqual((child.pos_relative, child.total_size), (10, 4))

elt = self.make_test_container()

child = ElementVoid.of_size(4)

elt.place_child(child, shrink_child=False, shrink_previous=False,

grow_child=True)

self.assertEqual((child.pos_relative, child.total_size), (0, 5))

elt = self.make_test_container()

child = ElementVoid.of_size(7)

with self.assertRaises(Inconsistent):

elt.place_child(child, region_size=40, shrink_child=False,

shrink_previous=False, grow_child=False)

elt.place_child(child, shrink_child=False, shrink_previous=False,

grow_child=False)

self.assertEqual((child.pos_relative, child.total_size), (40, 7))

elt = self.make_test_container()

child = ElementVoid.of_size(7)

elt.place_child(child, shrink_child=False, shrink_previous=False,

grow_child=True)

self.assertEqual((child.pos_relative, child.total_size), (25, 8))

# Shrink child

elt = self.make_test_container()

child = ElementVoid.of_size(10)

elt.place_child(child, shrink_child=True, shrink_previous=False,

grow_child=False)

self.assertEqual((child.pos_relative, child.total_size), (0, 2))

elt = self.make_test_container()

child = ElementString.new_with_value(UNK_ID, 'a') # min size == 6

child.resize_total(10)

elt.place_child(child, shrink_child=True, shrink_previous=False,

grow_child=False)

self.assertEqual((child.pos_relative, child.total_size), (10, 6))

elt = self.make_test_container()

child = ElementString.new_with_value(UNK_ID, 'ab') # min size == 7

child.resize_total(10)

elt.place_child(child, shrink_child=True, shrink_previous=False,

grow_child=False)

self.assertEqual((child.pos_relative, child.total_size), (25, 8))

elt = self.make_test_container()

child = ElementString.new_with_value(UNK_ID, 'abcd') # min size == 9

child.resize_total(10)

with self.assertRaises(Inconsistent):

elt.place_child(child, region_size=40, shrink_child=True,

shrink_previous=False, grow_child=False)

elt.place_child(child, shrink_child=True, shrink_previous=False,

grow_child=False)

self.assertEqual((child.pos_relative, child.total_size), (40, 10))

# Shrink previous

elt = self.make_test_container()

child = ElementString.new_with_value(UNK_ID, 'abcd') # min size == 9

elt.place_child(child, shrink_child=False, shrink_previous=True,

grow_child=False)

self.assertEqual((child.pos_relative, child.total_size), (24, 9))

self.assertEqual(elt.find(16).total_size, 8)

elt = self.make_test_container()

child = ElementString.new_with_value(UNK_ID, 'abcd') # min size == 9

child.resize_total(10)

elt.place_child(child, shrink_child=False, shrink_previous=True,

grow_child=False)

self.assertEqual((child.pos_relative, child.total_size), (23, 10))

self.assertEqual(elt.find(16).total_size, 7)

elt = self.make_test_container()

child = ElementString.new_with_value(UNK_ID, 'abcd') # min size == 9

child.resize_total(10)

elt.place_child(child, shrink_child=True, shrink_previous=True,

grow_child=False)

self.assertEqual((child.pos_relative, child.total_size), (24, 9))

self.assertEqual(elt.find(16).total_size, 8)

elt = self.make_test_container()

elt.remove_child(elt.find(16))

ElementMaster.new(UNK_ID, elt, 16, size=2) # total size == 7

# gap from 23 -- 33, shrinks to 22--33

child = ElementString.new_with_value(UNK_ID, 'abcd')

child.resize_total(11)

with self.assertRaises(Inconsistent):

# Won't find the gap with grow_child=False

elt.place_child(child, region_size=40, shrink_child=False,

shrink_previous=True, grow_child=False)

elt.place_child(child, shrink_child=False, shrink_previous=True,

grow_child=True)

self.assertEqual((child.pos_relative, child.total_size), (22, 11))

self.assertEqual(elt.find(16).total_size, 6)

# Test get_overlapping()

elt = self.make_test_container()

self.assertEqual(elt.get_overlapping(), frozenset())

# Negative position

child = ElementUnicode.new_with_value('MuxingApp', 'abcd', elt, -1)

self.assertEqual(elt.get_overlapping(), frozenset({child}))

elt.add_child(child, -1)

self.assertRaises(Inconsistent, elt.get_overlapping, ('MuxingApp', ))

# Two fixed

elt.add_child(child, 100)

ElementUnicode.new_with_value('MuxingApp', 'efgh', elt, 105)

self.assertRaises(Inconsistent, elt.get_overlapping, ('MuxingApp', ))

# One fixed

elt = self.make_test_container()

result = frozenset({elt[0], elt[1], elt[2]})

child = ElementUnicode.new_with_value('MuxingApp', 'abcd', elt, 2)

child.resize_total(10)

self.assertEqual(elt.get_overlapping(('MuxingApp',)), result)

# None fixed

elt = self.make_test_container()

result = frozenset({elt[0], elt[1], elt[2]})

child = ElementUnicode.new_with_value('MuxingApp', 'abcd', elt, 2)

child.resize_total(10) # this one is largest

self.assertEqual(elt.get_overlapping(), result)

elt = self.make_test_container()

child = ElementVoid.of_size(2, elt, 4) # this one is smallest

self.assertEqual(elt.get_overlapping(), frozenset({child}))

# One-byte gap

elt = self.make_test_container()

result = frozenset({elt[0]})

elt[0].resize_total(4)

self.assertEqual(elt.get_overlapping(), result)

def test_2_rearrange(self):

"Test Container.rearrange() and its relatives."

from ebml.element import ElementMaster, ElementVoid, ElementUnsupported

# -- Test rearrange_resize()

# Already arranged

elt = self.make_test_container()

elt.resize(40)

elt.rearrange_resize()

self.check_child_pos(elt, 0, 5, 10, 16, 25, 33, 40)

self.assertEqual(elt.size, 40)

# Shrink

elt = self.make_test_container()

elt.resize(50)

elt.rearrange_resize()

self.check_child_pos(elt, 0, 5, 10, 16, 25, 33, 40)

self.assertEqual(elt.size, 40)

# Grow

elt = self.make_test_container()

elt.resize(30)

elt.rearrange_resize()

self.check_child_pos(elt, 0, 5, 10, 16, 25, 33, 40)

self.assertEqual(elt.size, 40)

# Grow because we're lazy

elt = self.make_test_container()

elt.resize(40)

ElementUnsupported.of_size(UNK_ID, 15, elt, 24)

elt.rearrange_resize()

self.check_child_pos(elt, 0, 5, 10, 16, 24, 39, 46)

self.assertEqual(elt.size, 46)

# Grow because we're forced to

elt = self.make_test_container()

elt.resize(40)

ElementUnsupported.of_size(UNK_ID, 35, elt, 0)

elt.rearrange_resize(prefer_grow=False)

self.check_child_pos(elt, 0, 35, 40, 45, 52)

self.assertEqual(elt.size, 52)

elt = self.make_test_container()

elt.resize(16)

elt.rearrange_resize(prefer_grow=False)

self.check_child_pos(elt, 0, 5, 10, 17)

self.assertEqual(elt.size, 17)

# Add a Void at the end

elt = self.make_test_container()

elt.resize(50)

elt.rearrange_resize(allow_shrink=False)

self.check_child_pos(elt, 0, 5, 10, 16, 25, 33, 40, 50)

self.assertEqual(elt.size, 50)

elt = self.make_test_container()

elt.resize(41)

elt.rearrange_resize(allow_shrink=False)

self.check_child_pos(elt, 0, 5, 10, 16, 25, 33, 40, 42)

self.assertEqual(elt.size, 42)

elt = self.make_test_container()

elt.resize(20)

elt.rearrange_resize(prefer_grow=False, allow_shrink=False)

self.check_child_pos(elt, 0, 5, 10, 17, 20)

self.assertEqual(elt.size, 20)

elt = self.make_test_container()

elt.resize(18)

elt.rearrange_resize(prefer_grow=False, allow_shrink=False)

self.check_child_pos(elt, 0, 5, 10, 17, 19)

self.assertEqual(elt.size, 19)

# -- Test rearrange() --

# No children

elt = ElementMaster.new(UNK_ID)

ElementVoid.of_size(5, elt, 0)

elt.rearrange()

self.assertEqual(len(elt), 0)

# Eliminate overlaps (part 1 of the algorithm)

# Push everything forward

elt = self.make_test_container()

ElementUnsupported.of_size(UNK_ID, 35, elt, 0)

elt.rearrange()

self.check_child_pos(elt, 0, 35, 40, 49, 56)

# Push first and second forward less

elt = self.make_test_container()

ElementUnsupported.of_size(UNK_ID, 24, elt, 0)

elt.rearrange()

self.check_child_pos(elt, 0, 24, 29, 38, 45)

# Push first and second forward and shrink second

elt = self.make_test_container()

ElementUnsupported.of_size(UNK_ID, 23, elt, 0)

elt.rearrange()

self.check_child_pos(elt, 0, 23, 28, 33, 40)

# Push first and second forward and shrink second less

elt = self.make_test_container()

ElementUnsupported.of_size(UNK_ID, 22, elt, 0)

elt.rearrange()

self.check_child_pos(elt, 0, 22, 27, 33, 40)

# No need to shrink second

elt = self.make_test_container()

ElementUnsupported.of_size(UNK_ID, 19, elt, 0)

elt.rearrange()

self.check_child_pos(elt, 0, 19, 24, 33, 40)

# Push first and second forward with 1-byte gap

elt = self.make_test_container()

ElementUnsupported.of_size(UNK_ID, 18, elt, 0)

elt.rearrange()

self.check_child_pos(elt, 0, 18, 23, 32, 39)

# Push first and second forward with 4-byte gap

elt = self.make_test_container()

ElementUnsupported.of_size(UNK_ID, 15, elt, 0)

elt.rearrange()

self.check_child_pos(elt, 0, 15, 20, 29, 33, 40)

# One-byte gap at beginning

elt = self.make_test_container()

ElementUnsupported.of_size(0x012233, 4, elt, 1)

elt.rearrange()

self.check_child_pos(elt, 0, 4, 9, 16, 25, 33, 40)

# Fit in goal size (part 2 of the algorithm)

# Everything already fits

elt = self.make_test_container()

elt.rearrange(40)

self.check_child_pos(elt, 0, 5, 10, 16, 25, 33, 40)

# One-byte gap

elt = self.make_test_container()

elt.rearrange(41)

self.check_child_pos(elt, 0, 5, 10, 16, 25, 32)

# Move last

elt = self.make_test_container()

elt.rearrange(39)

self.check_child_pos(elt, 0, 5, 10, 16, 25, 32)

elt = self.make_test_container()

elt.rearrange(34)

self.check_child_pos(elt, 0, 5, 10, 16, 25, 32)

elt = self.make_test_container()

elt.rearrange(32)

self.check_child_pos(elt, 0, 5, 10, 16, 25, 32)

# Move last with 1-byte gap (shrinks second)

elt = self.make_test_container()

elt.rearrange(33)

self.check_child_pos(elt, 0, 5, 10, 16, 21, 28)

# Move last and shrink second

elt = self.make_test_container()

elt.rearrange(31)

self.check_child_pos(elt, 0, 5, 10, 16, 21, 28)

elt = self.make_test_container()

elt.rearrange(30)

self.check_child_pos(elt, 0, 5, 10, 16, 21, 28)

elt = self.make_test_container()

elt.rearrange(28)

self.check_child_pos(elt, 0, 5, 10, 16, 21, 28)

# Move two last

elt = self.make_test_container()

elt.rearrange(29)

self.check_child_pos(elt, 0, 5, 10, 15, 22)

elt = self.make_test_container()

elt.rearrange(27)

self.check_child_pos(elt, 0, 5, 10, 15, 22)

elt = self.make_test_container()

elt.rearrange(24)

self.check_child_pos(elt, 0, 5, 10, 15, 22)

elt = self.make_test_container()

elt.rearrange(22)

self.check_child_pos(elt, 0, 5, 10, 15, 22)

# Maximal shrink

elt = self.make_test_container()

elt.rearrange(23)

self.check_child_pos(elt, 0, 5, 10, 17)

elt = self.make_test_container()

elt.rearrange(21)

self.check_child_pos(elt, 0, 5, 10, 17)

elt = self.make_test_container()

elt.rearrange(17)

self.check_child_pos(elt, 0, 5, 10, 17)

# Nothing to do about the trailing 1-byte gap

elt = self.make_test_container()

elt.rearrange(18)

self.check_child_pos(elt, 0, 5, 10, 17)

# Doesn't fit

elt = self.make_test_container()

elt.rearrange(16)

self.check_child_pos(elt, 0, 5, 10, 17)

# Recursively rearrange (part 3 of the algorithm)

elt = self.make_test_container()

elt2 = self.make_test_container()

elt.add_child(elt2, 7)

elt.rearrange()

self.check_child_pos(elt, 0, 5, 10, 63, 72, 79)

self.check_child_pos(elt2, 0, 5, 10, 16, 25, 33, 40, 48)

self.assertEqual(elt2.size, 48)

elt = self.make_test_container()

elt2 = self.make_test_container()

elt.add_child(elt2, 7)

elt.rearrange(0)

self.check_child_pos(elt, 0, 5, 27, 32, 39)

self.check_child_pos(elt2, 0, 5, 10, 17)

self.assertEqual(elt2.size, 17)

# Test expand_header() and element at negative position

elt = self.make_test_container()

size = elt.total_size

elt.remove_child(0)

elt.remove_child(-1)

ElementUnsupported.of_size(UNK_ID, 5, elt, 0)

elt.expand_header(4)

self.assertEqual(elt.total_size, size)

self.check_child_pos(elt, -3, 2, 7, 13, 22, 30, 37)

elt.rearrange()

self.check_child_pos(elt, 0, 5, 10, 13, 22, 30, 37)

python-ebml/test/test_container.py at master · python-ffmpegio/python-ebml · GitHub

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