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161 lines
4.9 KiB
Python
161 lines
4.9 KiB
Python
"""
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Parser of FastTrackerII Extended Module (XM) version 1.4
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Documents:
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- Modplug source code (file modplug/soundlib/Load_mod.cpp)
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http://sourceforge.net/projects/modplug
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- Dumb source code (files include/dumb.h and src/it/readmod.c
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http://dumb.sf.net/
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- Documents on "MOD" format on Wotsit
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http://www.wotsit.org
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Compressed formats (i.e. starting with "PP20" or having "PACK" as type
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are not handled. Also NoiseTracker's NST modules aren't handled, although
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it might be possible: no file format and 15 samples
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Author: Christophe GISQUET <christophe.gisquet@free.fr>
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Creation: 18th February 2007
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"""
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from math import log10
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from hachoir.parser import Parser
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from hachoir.field import (FieldSet,
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Bits, UInt16, UInt8,
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RawBytes, String, GenericVector)
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from hachoir.core.endian import BIG_ENDIAN
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from hachoir.core.text_handler import textHandler
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# Old NoiseTracker 15-samples modules can have anything here.
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MODULE_TYPE = {
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b"M.K.": ("Noise/Pro-Tracker", 4),
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b"M!K!": ("Noise/Pro-Tracker", 4),
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b"M&K&": ("Noise/Pro-Tracker", 4),
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b"RASP": ("StarTrekker", 4),
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b"FLT4": ("StarTrekker", 4),
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b"FLT8": ("StarTrekker", 8),
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b"6CHN": ("FastTracker", 6),
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b"8CHN": ("FastTracker", 8),
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b"CD81": ("Octalyser", 8),
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b"OCTA": ("Octalyser", 8),
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b"FA04": ("Digital Tracker", 4),
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b"FA06": ("Digital Tracker", 6),
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b"FA08": ("Digital Tracker", 8),
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}
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def getFineTune(val):
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return ("0", "1", "2", "3", "4", "5", "6", "7", "8",
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"-8", "-7", "-6", "-5", "-4", "-3", "-2", "-1")[val.value]
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def getVolume(val):
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return "%.1f dB" % (20.0 * log10(val.value / 64.0))
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class SampleInfo(FieldSet):
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static_size = 30 * 8
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def createFields(self):
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yield String(self, "name", 22, strip='\0')
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yield UInt16(self, "sample_count")
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yield textHandler(UInt8(self, "fine_tune"), getFineTune)
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yield textHandler(UInt8(self, "volume"), getVolume)
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yield UInt16(self, "loop_start", "Loop start offset in samples")
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yield UInt16(self, "loop_len", "Loop length in samples")
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def createValue(self):
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return self["name"].value
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class Header(FieldSet):
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static_size = 1084 * 8
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def createFields(self):
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yield String(self, "name", 20, strip='\0')
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yield GenericVector(self, "samples", 31, SampleInfo, "info")
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yield UInt8(self, "length")
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yield UInt8(self, "played_patterns_count")
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yield GenericVector(self, "patterns", 128, UInt8, "position")
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yield String(self, "type", 4)
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def getNumChannels(self):
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return MODULE_TYPE[self["type"].value][1]
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class Note(FieldSet):
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static_size = 8 * 4
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def createFields(self):
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yield Bits(self, 4, "note_hi_nibble")
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yield Bits(self, 12, "period")
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yield Bits(self, 4, "note_low_nibble")
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yield Bits(self, 4, "effect")
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yield UInt8(self, "parameter")
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class Row(FieldSet):
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def __init__(self, parent, name, channels, desc=None):
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FieldSet.__init__(self, parent, name, description=desc)
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self.channels = channels
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self._size = 8 * self.channels * 4
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def createFields(self):
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for index in range(self.channels):
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yield Note(self, "note[]")
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class Pattern(FieldSet):
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def __init__(self, parent, name, channels, desc=None):
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FieldSet.__init__(self, parent, name, description=desc)
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self.channels = channels
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self._size = 64 * 8 * self.channels * 4
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def createFields(self):
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for index in range(64):
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yield Row(self, "row[]", self.channels)
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class AmigaModule(Parser):
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PARSER_TAGS = {
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"id": "mod",
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"category": "audio",
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"file_ext": ("mod", "nst", "wow", "oct", "sd0"),
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"mime": ('audio/mod', 'audio/x-mod', 'audio/mod', 'audio/x-mod'),
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"min_size": 1084 * 8,
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"description": "Uncompressed amiga module"
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}
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endian = BIG_ENDIAN
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def validate(self):
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modtype = self.stream.readBytes(1080 * 8, 4)
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if modtype not in MODULE_TYPE:
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return "Invalid module type %a" % modtype
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self.createValue = lambda modtype: "%s module, %u channels" % MODULE_TYPE[
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modtype]
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return True
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def createFields(self):
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header = Header(self, "header")
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yield header
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channels = header.getNumChannels()
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# Number of patterns
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patterns = 0
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for index in range(128):
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patterns = max(patterns,
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header["patterns/position[%u]" % index].value)
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patterns += 1
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# Yield patterns
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for index in range(patterns):
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yield Pattern(self, "pattern[]", channels)
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# Yield samples
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for index in range(31):
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count = header["samples/info[%u]/sample_count" % index].value
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if count:
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self.info("Yielding sample %u: %u samples" % (index, count))
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yield RawBytes(self, "sample_data[]", 2 * count,
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"Sample %u" % index)
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