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980e05cc99
Backported 400 revisions from rev 1de4961-8897c5b (2018-2014). Move core/benchmark, core/cmd_line, core/memory, core/profiler and core/timeout to core/optional/* Remove metadata/qt* PORT: Version 2.0a3 (inline with 3.0a3 @ f80c7d5). Basic Support for XMP Packets. tga: improvements to adhere more closely to the spec. pdf: slightly improved parsing. rar: fix TypeError on unknown block types. Add MacRoman win32 codepage. tiff/exif: support SubIFDs and tiled images. Add method to export metadata in dictionary. mpeg_video: don't attempt to parse Stream past length. mpeg_video: parse ESCR correctly, add SCR value. Change centralise CustomFragments. field: don't set parser class if class is None, to enable autodetect. field: add value/display for CustomFragment. parser: inline warning to enable tracebacks in debug mode. Fix empty bytestrings in makePrintable. Fix contentSize in jpeg.py to account for image_data blocks. Fix the ELF parser. Enhance the AR archive parser. elf parser: fix wrong wrong fields order in parsing little endian section flags. elf parser: add s390 as a machine type. Flesh out mp4 parser. PORT: Version 2.0a1 (inline with 3.0a1). Major refactoring and PEP8. Fix ResourceWarning warnings on files. Add a close() method and support for the context manager protocol ("with obj: ...") to parsers, input and output streams. metadata: get comment from ZIP. Support for InputIOStream.read(0). Fix sizeGe when size is None. Remove unused new_seekable_field_set file. Remove parser Mapsforge .map. Remove parser Parallel Realities Starfighter .pak files. sevenzip: fix for newer archives. java: update access flags and modifiers for Java 1.7 and update description text for most recent Java. Support ustar prefix field in tar archives. Remove file_system* parsers. Remove misc parsers 3d0, 3ds, gnome_keyring, msoffice*, mstask, ole*, word*. Remove program parsers macho, nds, prc. Support non-8bit Character subclasses. Python parser supports Python 3.7. Enhance mpeg_ts parser to support MTS/M2TS. Support for creation date in tiff. Change don't hardcode errno constant. PORT: 1.9.1 Internal Only: The following are legacy reference to upstream commit messages. Relevant changes up to b0a115f8. Use integer division. Replace HACHOIR_ERRORS with Exception. Fix metadata.Data: make it sortable. Import fixes from e7de492. PORT: Version 2.0a1 (inline with 3.0a1 @ e9f8fad). Replace hachoir.core.field with hachoir.field Replace hachoir.core.stream with hachoir.stream Remove the compatibility module for PY1.5 to PY2.5. metadata: support TIFF picture. metadata: fix string normalization. metadata: fix datetime regex Fix hachoir bug #57. FileFromInputStream: fix comparison between None and an int. InputIOStream: open the file in binary mode.
92 lines
3.7 KiB
Python
92 lines
3.7 KiB
Python
"""
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RealAudio (.ra) parser
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Author: Mike Melanson
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References:
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http://wiki.multimedia.cx/index.php?title=RealMedia
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Samples:
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http://samples.mplayerhq.hu/real/RA/
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"""
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from hachoir.parser import Parser
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from hachoir.field import (FieldSet,
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UInt8, UInt16, UInt32,
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Bytes, RawBytes, String,
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PascalString8)
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from hachoir.core.tools import humanFrequency
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from hachoir.core.text_handler import displayHandler
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from hachoir.core.endian import BIG_ENDIAN
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class Metadata(FieldSet):
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def createFields(self):
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yield PascalString8(self, "title", charset="ISO-8859-1")
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yield PascalString8(self, "author", charset="ISO-8859-1")
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yield PascalString8(self, "copyright", charset="ISO-8859-1")
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yield PascalString8(self, "comment", charset="ISO-8859-1")
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class RealAudioFile(Parser):
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MAGIC = ".ra\xFD"
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PARSER_TAGS = {
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"id": "real_audio",
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"category": "audio",
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"file_ext": ["ra"],
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"mime": (u"audio/x-realaudio", u"audio/x-pn-realaudio"),
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"min_size": 6 * 8,
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"magic": ((MAGIC, 0),),
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"description": u"Real audio (.ra)",
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}
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endian = BIG_ENDIAN
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def validate(self):
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if self["signature"].value != self.MAGIC:
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return "Invalid signature"
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if self["version"].value not in (3, 4):
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return "Unknown version"
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return True
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def createFields(self):
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yield Bytes(self, "signature", 4, r"RealAudio identifier ('.ra\xFD')")
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yield UInt16(self, "version", "Version")
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if self["version"].value == 3:
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yield UInt16(self, "header_size", "Header size")
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yield RawBytes(self, "Unknown1", 10)
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yield UInt32(self, "data_size", "Data size")
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yield Metadata(self, "metadata")
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yield UInt8(self, "Unknown2")
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yield PascalString8(self, "FourCC")
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audio_size = self["data_size"].value
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else: # version = 4
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yield UInt16(self, "reserved1", "Reserved, should be 0")
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yield String(self, "ra4sig", 4, "'.ra4' signature")
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yield UInt32(self, "filesize", "File size (minus 40 bytes)")
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yield UInt16(self, "version2", "Version 2 (always equal to version)")
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yield UInt32(self, "headersize", "Header size (minus 16)")
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yield UInt16(self, "codec_flavor", "Codec flavor")
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yield UInt32(self, "coded_frame_size", "Coded frame size")
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yield RawBytes(self, "unknown1", 12)
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yield UInt16(self, "subpacketh", "Subpacket h (?)")
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yield UInt16(self, "frame_size", "Frame size")
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yield UInt16(self, "sub_packet_size", "Subpacket size")
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yield UInt16(self, "unknown2", "Unknown")
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yield displayHandler(UInt16(self, "sample_rate", "Sample rate"), humanFrequency)
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yield UInt16(self, "unknown3", "Unknown")
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yield UInt16(self, "sample_size", "Sample size")
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yield UInt16(self, "channels", "Channels")
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yield PascalString8(self, "Interleaving ID String")
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yield PascalString8(self, "FourCC")
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yield RawBytes(self, "unknown4", 3)
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yield Metadata(self, "metadata")
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audio_size = (self["filesize"].value + 40) - (self["headersize"].value + 16)
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if 0 < audio_size:
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yield RawBytes(self, "audio_data", audio_size)
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def createDescription(self):
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if (self["version"].value == 3):
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return "RealAudio v3 file, '%s' codec" % self["FourCC"].value
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elif (self["version"].value == 4):
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return "RealAudio v4 file, '%s' codec, %s, %u channels" % (
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self["FourCC"].value, self["sample_rate"].display, self["channels"].value)
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else:
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return "Real audio"
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