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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.
88 lines
3.2 KiB
Python
88 lines
3.2 KiB
Python
"""
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AU audio file parser
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Author: Victor Stinner
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Creation: 12 july 2006
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"""
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from hachoir.parser import Parser
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from hachoir.field import UInt32, Enum, String, RawBytes
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from hachoir.core.endian import BIG_ENDIAN
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from hachoir.core.text_handler import displayHandler, filesizeHandler
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from hachoir.core.tools import createDict, humanFrequency
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class AuFile(Parser):
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PARSER_TAGS = {
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"id": "sun_next_snd",
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"category": "audio",
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"file_ext": ("au", "snd"),
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"mime": (u"audio/basic",),
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"min_size": 24 * 8,
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"magic": ((".snd", 0),),
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"description": "Sun/NeXT audio"
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}
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endian = BIG_ENDIAN
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CODEC_INFO = {
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1: (8, u"8-bit ISDN u-law"),
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2: (8, u"8-bit linear PCM"),
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3: (16, u"16-bit linear PCM"),
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4: (24, u"24-bit linear PCM"),
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5: (32, u"32-bit linear PCM"),
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6: (32, u"32-bit IEEE floating point"),
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7: (64, u"64-bit IEEE floating point"),
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8: (None, u"Fragmented sample data"),
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9: (None, u"DSP program"),
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10: (8, u"8-bit fixed point"),
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11: (16, u"16-bit fixed point"),
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12: (24, u"24-bit fixed point"),
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13: (32, u"32-bit fixed point"),
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18: (16, u"16-bit linear with emphasis"),
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19: (16, u"16-bit linear compressed"),
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20: (16, u"16-bit linear with emphasis and compression"),
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21: (None, u"Music kit DSP commands"),
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23: (None, u"4-bit ISDN u-law compressed (CCITT G.721 ADPCM)"),
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24: (None, u"ITU-T G.722 ADPCM"),
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25: (None, u"ITU-T G.723 3-bit ADPCM"),
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26: (None, u"ITU-T G.723 5-bit ADPCM"),
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27: (8, u"8-bit ISDN A-law"),
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}
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# Create bit rate and codec name dictionnaries
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BITS_PER_SAMPLE = createDict(CODEC_INFO, 0)
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CODEC_NAME = createDict(CODEC_INFO, 1)
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VALID_NB_CHANNEL = set((1, 2)) # FIXME: 4, 5, 7, 8 channels are supported?
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def validate(self):
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if self.stream.readBytes(0, 4) != ".snd":
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return "Wrong file signature"
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if self["channels"].value not in self.VALID_NB_CHANNEL:
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return "Invalid number of channel"
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return True
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def getBitsPerSample(self):
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"""
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Get bit rate (number of bit per sample per channel),
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may returns None if you unable to compute it.
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"""
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return self.BITS_PER_SAMPLE.get(self["codec"].value)
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def createFields(self):
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yield String(self, "signature", 4, 'Format signature (".snd")', charset="ASCII")
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yield UInt32(self, "data_ofs", "Data offset")
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yield filesizeHandler(UInt32(self, "data_size", "Data size"))
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yield Enum(UInt32(self, "codec", "Audio codec"), self.CODEC_NAME)
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yield displayHandler(UInt32(self, "sample_rate", "Number of samples/second"), humanFrequency)
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yield UInt32(self, "channels", "Number of interleaved channels")
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size = self["data_ofs"].value - self.current_size // 8
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if 0 < size:
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yield String(self, "info", size, "Information", strip=" \0", charset="ISO-8859-1")
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size = min(self["data_size"].value, (self.size - self.current_size) // 8)
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yield RawBytes(self, "audio_data", size, "Audio data")
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def createContentSize(self):
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return (self["data_ofs"].value + self["data_size"].value) * 8
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