PSFTracker/player.py at master · PeterFidelman/PSFTracker · GitHub

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# constants

kNumLinesInPattern = 32

kNumBytesInLine = 4

oNumChannels = 0x02 # offset of field containing number of channels

oStartOfInstruments = 0x23 # offset of field containing offset of first instrument

oStartOfSpFx = 0x25 # offset of field containing offset of first spfx

oStartOfOrders = 0x27 # offset of field containing offset of first order

oStartOfPatterns = 0x29 # offset of field containing offset of first pattern

# variables updated at song load

aSong = 0 # address at which song is loaded - not used in this demonstrator

numChannels = 0

# variables updated at play time

state = 0 # play/stop

order = 0

pos = 0

# load song

fh = open('format', 'rb')

f = bytearray(fh.read())

def main():

init_reset()

while True:

play_a_line()

# let user hit key before continuing

dummy = raw_input()

# init/reset song

def init_reset():

global numChannels, state, order, pos

pos = 0

numChannels = f[aSong + oNumChannels]

order = f[aSong + oStartOfOrders]

if order == f[aSong + oStartOfPatterns] + aSong:

print "the song is zero length"

print hex(numChannels)

def play_a_line():

global numChannels, state, order, pos

print "pos %d:" % pos

for channel in range(0, numChannels):

pattern_num = f[order + channel]

pattern = f[aSong + oStartOfPatterns] + pattern_num*kNumLinesInPattern*kNumBytesInLine

line = f[pattern + (pos * kNumBytesInLine)]

print "chan", hex(channel), "ptn", hex(pattern_num), "line", hex(line)

# move on to next line

pos += 1

# move on to next order if we're at the end of this one

if pos == kNumLinesInPattern:

pos = 0

order += numChannels

# loop to start of song if we're out of orders

if order == f[aSong + oStartOfPatterns] + aSong:

order = f[aSong + oStartOfOrders] + aSong

# call main

main()

PSFTracker/player.py at master · PeterFidelman/PSFTracker · GitHub

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