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127 lines
3.9 KiB
Python
127 lines
3.9 KiB
Python
"""
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Audio Interchange File Format (AIFF) parser.
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Author: Victor Stinner
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Creation: 27 december 2006
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"""
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from hachoir_parser import Parser
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from hachoir_core.field import (FieldSet,
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UInt16, UInt32, Float80, TimestampMac32,
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RawBytes, NullBytes,
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String, Enum, PascalString32)
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from hachoir_core.endian import BIG_ENDIAN
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from hachoir_core.text_handler import filesizeHandler
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from hachoir_core.tools import alignValue
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from hachoir_parser.audio.id3 import ID3v2
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CODEC_NAME = {
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'ACE2': u"ACE 2-to-1",
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'ACE8': u"ACE 8-to-3",
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'MAC3': u"MAC 3-to-1",
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'MAC6': u"MAC 6-to-1",
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'NONE': u"None",
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'sowt': u"Little-endian, no compression",
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}
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class Comment(FieldSet):
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def createFields(self):
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yield TimestampMac32(self, "timestamp")
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yield PascalString32(self, "text")
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def parseText(self):
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yield String(self, "text", self["size"].value)
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def parseID3(self):
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yield ID3v2(self, "id3v2", size=self["size"].value*8)
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def parseComment(self):
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yield UInt16(self, "nb_comment")
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for index in xrange(self["nb_comment"].value):
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yield Comment(self, "comment[]")
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def parseCommon(self):
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yield UInt16(self, "nb_channel")
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yield UInt32(self, "nb_sample")
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yield UInt16(self, "sample_size")
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yield Float80(self, "sample_rate")
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yield Enum(String(self, "codec", 4, strip="\0", charset="ASCII"), CODEC_NAME)
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def parseVersion(self):
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yield TimestampMac32(self, "timestamp")
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def parseSound(self):
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yield UInt32(self, "offset")
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yield UInt32(self, "block_size")
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size = (self.size - self.current_size) // 8
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if size:
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yield RawBytes(self, "data", size)
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class Chunk(FieldSet):
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TAG_INFO = {
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'COMM': ('common', "Common chunk", parseCommon),
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'COMT': ('comment', "Comment", parseComment),
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'NAME': ('name', "Name", parseText),
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'AUTH': ('author', "Author", parseText),
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'FVER': ('version', "Version", parseVersion),
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'SSND': ('sound', "Sound data", parseSound),
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'ID3 ': ('id3', "ID3", parseID3),
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}
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def __init__(self, *args):
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FieldSet.__init__(self, *args)
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self._size = (8 + alignValue(self["size"].value, 2)) * 8
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tag = self["type"].value
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if tag in self.TAG_INFO:
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self._name, self._description, self._parser = self.TAG_INFO[tag]
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else:
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self._parser = None
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def createFields(self):
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yield String(self, "type", 4, "Signature (FORM)", charset="ASCII")
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yield filesizeHandler(UInt32(self, "size"))
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size = self["size"].value
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if size:
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if self._parser:
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for field in self._parser(self):
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yield field
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if size % 2:
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yield NullBytes(self, "padding", 1)
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else:
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yield RawBytes(self, "data", size)
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class AiffFile(Parser):
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PARSER_TAGS = {
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"id": "aiff",
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"category": "audio",
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"file_ext": ("aif", "aiff", "aifc"),
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"mime": (u"audio/x-aiff",),
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"magic_regex": (("FORM.{4}AIF[CF]", 0),),
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"min_size": 12*8,
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"description": "Audio Interchange File Format (AIFF)"
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}
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endian = BIG_ENDIAN
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def validate(self):
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if self.stream.readBytes(0, 4) != "FORM":
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return "Invalid signature"
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if self.stream.readBytes(8*8, 4) not in ("AIFF", "AIFC"):
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return "Invalid type"
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return True
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def createFields(self):
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yield String(self, "signature", 4, "Signature (FORM)", charset="ASCII")
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yield filesizeHandler(UInt32(self, "filesize"))
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yield String(self, "type", 4, "Form type (AIFF or AIFC)", charset="ASCII")
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while not self.eof:
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yield Chunk(self, "chunk[]")
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def createDescription(self):
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if self["type"].value == "AIFC":
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return "Audio Interchange File Format Compressed (AIFC)"
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else:
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return "Audio Interchange File Format (AIFF)"
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def createContentSize(self):
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return self["filesize"].value * 8
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