Python code coverage for Lib/plat-mac/Carbon/MediaDescr.py

#	count	content
1	n/a	# Parsers/generators for QuickTime media descriptions
2	n/a	import struct
3	n/a
4	n/a	Error = 'MediaDescr.Error'
5	n/a
6	n/a	class _MediaDescriptionCodec:
7	n/a	def __init__(self, trunc, size, names, fmt):
8	n/a	self.trunc = trunc
9	n/a	self.size = size
10	n/a	self.names = names
11	n/a	self.fmt = fmt
12	n/a
13	n/a	def decode(self, data):
14	n/a	if self.trunc:
15	n/a	data = data[:self.size]
16	n/a	values = struct.unpack(self.fmt, data)
17	n/a	if len(values) != len(self.names):
18	n/a	raise Error, ('Format length does not match number of names')
19	n/a	rv = {}
20	n/a	for i in range(len(values)):
21	n/a	name = self.names[i]
22	n/a	value = values[i]
23	n/a	if type(name) == type(()):
24	n/a	name, cod, dec = name
25	n/a	value = dec(value)
26	n/a	rv[name] = value
27	n/a	return rv
28	n/a
29	n/a	def encode(self, dict):
30	n/a	list = [self.fmt]
31	n/a	for name in self.names:
32	n/a	if type(name) == type(()):
33	n/a	name, cod, dec = name
34	n/a	else:
35	n/a	cod = dec = None
36	n/a	value = dict[name]
37	n/a	if cod:
38	n/a	value = cod(value)
39	n/a	list.append(value)
40	n/a	rv = struct.pack(*list)
41	n/a	return rv
42	n/a
43	n/a	# Helper functions
44	n/a	def _tofixed(float):
45	n/a	hi = int(float)
46	n/a	lo = int(float*0x10000) & 0xffff
47	n/a	return (hi<<16)\|lo
48	n/a
49	n/a	def _fromfixed(fixed):
50	n/a	hi = (fixed >> 16) & 0xffff
51	n/a	lo = (fixed & 0xffff)
52	n/a	return hi + (lo / float(0x10000))
53	n/a
54	n/a	def _tostr31(str):
55	n/a	return chr(len(str)) + str + '\0'*(31-len(str))
56	n/a
57	n/a	def _fromstr31(str31):
58	n/a	return str31[1:1+ord(str31[0])]
59	n/a
60	n/a	SampleDescription = _MediaDescriptionCodec(
61	n/a	1, # May be longer, truncate
62	n/a	16, # size
63	n/a	('descSize', 'dataFormat', 'resvd1', 'resvd2', 'dataRefIndex'), # Attributes
64	n/a	"l4slhh" # Format
65	n/a	)
66	n/a
67	n/a	SoundDescription = _MediaDescriptionCodec(
68	n/a	1,
69	n/a	36,
70	n/a	('descSize', 'dataFormat', 'resvd1', 'resvd2', 'dataRefIndex',
71	n/a	'version', 'revlevel', 'vendor', 'numChannels', 'sampleSize',
72	n/a	'compressionID', 'packetSize', ('sampleRate', _tofixed, _fromfixed)),
73	n/a	"l4slhhhh4shhhhl" # Format
74	n/a	)
75	n/a
76	n/a	SoundDescriptionV1 = _MediaDescriptionCodec(
77	n/a	1,
78	n/a	52,
79	n/a	('descSize', 'dataFormat', 'resvd1', 'resvd2', 'dataRefIndex',
80	n/a	'version', 'revlevel', 'vendor', 'numChannels', 'sampleSize',
81	n/a	'compressionID', 'packetSize', ('sampleRate', _tofixed, _fromfixed), 'samplesPerPacket',
82	n/a	'bytesPerPacket', 'bytesPerFrame', 'bytesPerSample'),
83	n/a	"l4slhhhh4shhhhlllll" # Format
84	n/a	)
85	n/a
86	n/a	ImageDescription = _MediaDescriptionCodec(
87	n/a	1, # May be longer, truncate
88	n/a	86, # size
89	n/a	('idSize', 'cType', 'resvd1', 'resvd2', 'dataRefIndex', 'version',
90	n/a	'revisionLevel', 'vendor', 'temporalQuality', 'spatialQuality',
91	n/a	'width', 'height', ('hRes', _tofixed, _fromfixed), ('vRes', _tofixed, _fromfixed),
92	n/a	'dataSize', 'frameCount', ('name', _tostr31, _fromstr31),
93	n/a	'depth', 'clutID'),
94	n/a	'l4slhhhh4sllhhlllh32shh',
95	n/a	)
96	n/a
97	n/a	# XXXX Others, like TextDescription and such, remain to be done.