mma/xi_reader.py at master · bugnano/mma · GitHub

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from ctypes import *
import struct
import sys

f = open(sys.argv[1])
#f = open('/Users/a/Music/Sunvox/Sonatina Symphonic Orchestra/Keys - Grand Piano.xi', 'r')
file = f.read()

pos = 0

xi, instrument, tracker, major_version, minor_version = struct.unpack('21s22sx20s2b', file[pos:(pos + 0x42)])
pos += 0x42
print '/' * 80
print 'Sample info'
print xi, instrument, tracker, major_version, minor_version

note_samples = struct.unpack('96b', file[pos:(pos + 0x60)])
pos += 0x60
print '/' * 80
print 'Samples-notes map'
print note_samples

volume_envelope = struct.unpack('24h', file[pos:(pos + 0x30)])
pos += 0x30
#volume_envelope = dict(volume_envelope[::2], volume_envelope[1::2])
print '/' * 80
print 'Volume envelope:'
print volume_envelope
panning_envelope = struct.unpack('24h', file[pos:(pos + 0x30)])
pos += 0x30
#volume_envelope = dict(volume_envelope[::2], volume_envelope[1::2])
print '/' * 80
print 'Panning envelope:'
print panning_envelope

volume_points_number, panning_points_number, \
volume_sustain_point, volume_loop_start_point, volume_loop_end_point, \
panning_sustain_point, panning_loop_start_point, panning_loop_end_point, \
volume_type, panning_type, \
vibrato_type, vibrato_sweep, vibrato_depth, vibrato_rate \
 = struct.unpack('14b', file[pos:(pos + 0xe)])
pos += 0xe
print '/' * 80
print 'Volume and sustain points numbers:', volume_points_number, panning_points_number
print 'Volume sustain point:', volume_sustain_point
print 'Volume loop start and end points:', volume_loop_start_point, volume_loop_end_point
print '/' * 80
print 'Panning sustain point:', panning_sustain_point
print 'Panning loop start and end points:', panning_loop_start_point, panning_loop_end_point
print 'Volume type:', volume_type
print 'Panning type:', panning_type
print 'Vibrato type, weep, depth and rate:', vibrato_type, vibrato_sweep, vibrato_depth, vibrato_rate

volume_fadeout = struct.unpack('h', file[pos:(pos + 0x2)])[0]
pos += 0x2
print 'Volume fadeout:', volume_fadeout

extended_info = struct.unpack('22b', file[pos:(pos + 0x16)])
pos += 0x16
print '/' * 80
print 'Extended info (mostly zeros):'
print extended_info

pos = 0x128
samples_number = struct.unpack('h', file[pos:(pos + 0x2)])[0]
print '/' * 80
print 'Samples count: ', samples_number

print '/' * 80
print 'Sample data:'

pos = 0x12a
samples = range(samples_number)
for i in range(samples_number):
	samples[i] = {}
	samples[i]['length'], samples[i]['loop_start'], samples[i]['loop_length'], \
	samples[i]['volume'], samples[i]['finetune'], samples[i]['type'], \
	samples[i]['panning'], samples[i]['transpose'], samples[i]['sample_name_length'], \
	samples[i]['sample_name'] = struct.unpack('3i6b22s', file[pos:(pos + 40)])
	pos += 40
	print samples[i]

# for i in range(samples_number):
# 	samples[i]['data'] = struct.unpack(str(samples[i]['length']) + 'b', file[pos:(pos + samples[i]['length'])])
# 	pos += samples[i]['length']


#, volume_envelope_points, \
#panning_envelope_points, volume_points_number, panning_points_number = x