author | Tero Marttila <terom@fixme.fi> |
Sun, 14 Jun 2009 23:43:40 +0300 | |
changeset 120 | 55cb7fc9c8fb |
child 121 | 3bed35e79f41 |
permissions | -rw-r--r-- |
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parents:
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""" |
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The various Exif backends that we have |
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""" |
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from __future__ import with_statement |
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import utils |
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class ExifHandler (object) : |
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""" |
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Our generic interface for Exif data |
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""" |
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|
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def __init__ (self, file) : |
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""" |
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Load Exif data from the given File. |
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""" |
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self.file = file |
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def image_tag (self, tag, default=None) : |
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""" |
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Load and return the human-readable unicode-safe value for the given main image tag. |
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""" |
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abstract |
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|
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def image_tags (self, tags) : |
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""" |
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Load and return the given tags for the main image as a sequence of (tag, value) tuples , following the same |
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rules as image_tag, except there should mainly be only one call to this function, encompassing all the |
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relevant tags. |
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|
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The returned list should omit those values which were not found. |
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""" |
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for tag in tags : |
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# try and fetch value |
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value = self.image_tag(tag) |
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# filter out default not-found |
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if value is not None : |
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yield tag, value |
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try : |
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import pyexiv2 |
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except ImportError : |
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PyExiv2_Handler = None |
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else : |
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class PyExiv2_Handler (ExifHandler) : |
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NAME = 'pyexiv2' |
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def __init__ (self, file) : |
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""" |
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Load as pyexiv2.Image |
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""" |
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# create |
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self.image = pyexiv2.Image(file.path) |
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# load |
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self.image.readMetadata() |
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def image_tag (self, tag, default=None) : |
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try : |
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# XXX: this is wrong |
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return self.image.interpretedExifValue("Exif.Photo.%s" % tag) |
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except (IndexError, KeyError) : |
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return default |
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try : |
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from lib import EXIF |
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except ImportError : |
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EXIF_Handler = None |
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else : |
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class EXIF_Handler (ExifHandler) : |
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NAME = 'EXIFpy' |
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def __init__ (self, file) : |
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""" |
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Load using EXIF.process_file |
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""" |
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with file.open('rb') as fh : |
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self.tags = EXIF.process_file(fh) |
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def image_tag (self, tag, default=None) : |
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# XXX: this is wrong |
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return self.tags.get('Image %s' % (tag, ), default) |
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# ExifHandler implementations to use, in preference order |
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EXIF_HANDLERS = [ |
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# reasonably fast, but requires the native library and extension module |
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PyExiv2_Handler, |
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100 |
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101 |
# pure-python, but very, very slow |
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102 |
EXIF_Handler, |
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103 |
] |
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104 |
|
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105 |
# default ExifHandler to use |
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EXIF_HANDLER = utils.first(EXIF_HANDLERS) |
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107 |
|
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108 |
# ExifHandler implementations by name |
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EXIF_HANDLERS_BY_NAME = dict((h.NAME, h) for h in EXIF_HANDLERS) |
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110 |
|
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111 |
def load (config, file) : |
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112 |
""" |
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113 |
Load Exif data using the configured Exif handler, and return the instance. |
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114 |
|
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115 |
Returns None if there wasn't any Exif handler available for use. |
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116 |
""" |
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117 |
|
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118 |
if config.exif_handler : |
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119 |
# explicit |
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120 |
exif_handler = config.exif_handler |
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121 |
|
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122 |
elif config.exif_handler_name : |
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123 |
# by name |
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124 |
exif_handler = EXIF_HANDLERS_BY_NAME[config.exif_handler_name] |
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125 |
|
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126 |
else : |
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127 |
# default |
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128 |
exif_handler = EXIF_HANDLER |
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129 |
|
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130 |
if exif_handler : |
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131 |
# found one, use it |
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132 |
return exif_handler(file) |
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133 |
|
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134 |
else : |
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135 |
# nothing :( |
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136 |
return None |
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137 |