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inspectpti.py
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inspectpti.py
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#!/usr/bin/env python3
"""Inspect Polyend Tracker .pti files."""
from __future__ import annotations
import enum
import functools
import glob
import io
import json
import os
import struct
from typing import Any, Callable
##
# Discover header length by finding PCM data offset
##
with open("./test.wav", "rb") as f:
test_wav_data = f.read()
with open("./test.pti", "rb") as f:
test_pti_data = f.read()
WAV_HEADER_LENGTH = 44
test_wav_header = test_wav_data[0:WAV_HEADER_LENGTH]
test_wav_audio = test_wav_data[WAV_HEADER_LENGTH:]
# Find .pti header length
# PTI_HEADER_LENGTH = test_pti_data.index(test_wav_audio) # 392
PTI_HEADER_LENGTH = 392
@functools.singledispatch
def get_header(value: object) -> bytes:
"""Return .pti header."""
raise NotImplementedError
@functools.singledispatch
def get_audio(value: object) -> bytes:
"""Return .pti audio."""
raise NotImplementedError
@get_header.register(bytes)
def _(value: bytes) -> bytes:
"""Return header from .pti bytestring."""
return value[0:PTI_HEADER_LENGTH]
@get_audio.register(bytes)
def _(value: bytes) -> bytes:
"""Return audio from .pti bytestring."""
return value[PTI_HEADER_LENGTH:]
test_pti_header = get_header(test_pti_data)
test_pti_audio = get_audio(test_pti_data)
assert test_pti_audio == test_wav_audio
##
# Get header and audio from open .pti file
##
@get_header.register(io.BufferedIOBase)
def _(value: io.BufferedIOBase) -> bytes:
"""Return header from .pti file."""
value.seek(0)
return value.read(PTI_HEADER_LENGTH)
@get_audio.register(io.BufferedIOBase)
def _(value: io.BufferedIOBase) -> bytes:
"""Return audio from .pti file."""
value.seek(PTI_HEADER_LENGTH)
return value.read()
@get_header.register(str)
def _(value: str) -> bytes:
"""Return header from path to .pti file."""
with open(value, "rb") as f:
return get_header(f)
@get_audio.register(str)
def _(value: str) -> bytes:
"""Return audio from path to .pti file."""
with open(value, "rb") as f:
return get_audio(f)
# Headers of test .pti files
pti_headers = {
"instrument_name": get_header("./test/1 ABCDEFGHIJKLMNOPQRSTUVWXYZabcde.pti"),
"volume_max": get_header("./test/2 test.pti"),
"volume_null": get_header("./test/3 test.pti"),
"volume_min": get_header("./test/4 test.pti"),
"panning_min": get_header("./test/5 test.pti"),
"panning_max": get_header("./test/6 test.pti"),
"tune_min": get_header("./test/7 test.pti"),
"tune_max": get_header("./test/8 test.pti"),
"tune_neg12": get_header("./test/16 test.pti"),
"finetune_min": get_header("./test/9 test.pti"),
"finetune_max": get_header("./test/10 test.pti"),
"filter_lp": get_header("./test/11 test.pti"),
"filter_hp": get_header("./test/12 test.pti"),
"filter_bp": get_header("./test/13 test.pti"),
"overdrive": get_header("./test/14 test.pti"),
"bit_depth": get_header("./test/15 test.pti"),
"lp_cutoff": get_header("./test/17 test.pti"),
"hp_cutoff_rez": get_header("./test/18 test.pti"),
"bp_cutoff_rez": get_header("./test/19 test.pti"),
"reverb_max": get_header("./test/20 test.pti"),
"reverb_min": get_header("./test/22 test.pti"),
"delay_max": get_header("./test/21 test.pti"),
"delay_min": get_header("./test/23 test.pti"),
"loop_fwd": get_header("./test/24 test.pti"),
"loop_bkwd": get_header("./test/25 test.pti"),
"loop_pingpong": get_header("./test/26 test.pti"),
"play_slice": get_header("./test/27 test.pti"),
"play_beat_slice": get_header("./test/28 test.pti"),
"play_wavetable": get_header("./test/29 test.pti"),
"play_granular": get_header("./test/30 test.pti"),
"volume_automation_off": get_header("./test/31 test.pti"),
"volume_automation_lfo": get_header("./test/32 test.pti"),
"panning_automation_envelope": get_header("./test/33 test.pti"),
"panning_automation_lfo": get_header("./test/34 test.pti"),
"cutoff_automation_envelope": get_header("./test/35 test.pti"),
"cutoff_automation_lfo": get_header("./test/36 test.pti"),
"wavetable_automation_envelope": get_header("./test/37 test.pti"),
"wavetable_automation_lfo": get_header("./test/38 test.pti"),
"granular_pos_automation_envelope": get_header("./test/39 test.pti"),
"granular_pos_automation_lfo": get_header("./test/40 test.pti"),
"finetune_envelope": get_header("./test/41 test.pti"),
"finetune_lfo": get_header("./test/42 test.pti"),
"filter_defaults": get_header("./filter-test/1 test.pti"),
"lp_100_0": get_header("./filter-test/2 test.pti"),
"lp_50_0": get_header("./filter-test/3 test.pti"),
"lp_0_0": get_header("./filter-test/4 test.pti"),
"lp_100_100": get_header("./filter-test/5 test.pti"),
"lp_100_50": get_header("./filter-test/6 test.pti"),
"lp_50_50": get_header("./filter-test/7 test.pti"),
"lp_0_100": get_header("./filter-test/8 test.pti"),
"lp_0_50": get_header("./filter-test/9 test.pti"),
"hp_100_0": get_header("./filter-test/10 test.pti"),
"hp_50_0": get_header("./filter-test/11 test.pti"),
"hp_0_0": get_header("./filter-test/12 test.pti"),
"hp_100_100": get_header("./filter-test/13 test.pti"),
"hp_100_50": get_header("./filter-test/14 test.pti"),
"hp_50_50": get_header("./filter-test/15 test.pti"),
"hp_0_100": get_header("./filter-test/16 test.pti"),
"hp_0_50": get_header("./filter-test/17 test.pti"),
"vol_env_attack_10": get_header("./envelope-test/2 test.pti"),
"vol_env_attack_5": get_header("./envelope-test/3 test.pti"),
"vol_env_decay_10": get_header("./envelope-test/4 test.pti"),
"vol_env_decay_5": get_header("./envelope-test/5 test.pti"),
"vol_env_sustain_50": get_header("./envelope-test/6 test.pti"),
"vol_env_sustain_0": get_header("./envelope-test/7 test.pti"),
"vol_env_release_10": get_header("./envelope-test/8 test.pti"),
"vol_env_release_0": get_header("./envelope-test/9 test.pti"),
"vol_env_amount_50": get_header("./envelope-test/10 test.pti"),
"vol_env_amount_0": get_header("./envelope-test/11 test.pti"),
"vol_lfo_rev_saw": get_header("./lfo-test/2 test.pti"),
"vol_lfo_saw": get_header("./lfo-test/3 test.pti"),
"vol_lfo_square": get_header("./lfo-test/4 test.pti"),
"vol_lfo_random": get_header("./lfo-test/5 test.pti"),
"vol_lfo_16_steps": get_header("./lfo-test/6 test.pti"),
"vol_lfo_6_steps": get_header("./lfo-test/7 test.pti"),
"vol_lfo_3_2_steps": get_header("./lfo-test/8 test.pti"),
"vol_lfo_1_64_steps": get_header("./lfo-test/9 test.pti"),
"vol_lfo_amount_100": get_header("./lfo-test/10 test.pti"),
"vol_lfo_amount_0": get_header("./lfo-test/11 test.pti"),
"pan_lfo_rev_saw": get_header("./lfo-test/12 test.pti"),
"pan_lfo_rev_random": get_header("./lfo-test/13 test.pti"),
"pan_lfo_1_48_step": get_header("./lfo-test/14 test.pti"),
"pan_lfo_1_128_steps": get_header("./lfo-test/15 test.pti"),
"pan_lfo_24_steps": get_header("./lfo-test/16 test.pti"),
"pan_lfo_amount_80": get_header("./lfo-test/17 test.pti"),
"pan_lfo_amount_66": get_header("./lfo-test/18 test.pti"),
"pan_lfo_amount_25": get_header("./lfo-test/19 test.pti"),
"pan_lfo_amount_10": get_header("./lfo-test/20 test.pti"),
"pan_lfo_amount_100": get_header("./lfo-test/21 test.pti"),
"cutoff_lfo_square_96_steps_amount38": get_header("./lfo-test/22 test.pti"),
"wavetable_lfo_random_2_steps_amount_8": get_header("./lfo-test/23 test.pti"),
"granular_lfo_saw_32_steps_amount_90": get_header("./lfo-test/24 test.pti"),
"finetune_lfo_square_3_steps_amount_100": get_header("./lfo-test/25 test.pti"),
"1-shot-start-002": get_header("./playback-test/2 test.pti"),
"1-shot-start-0025": get_header("./playback-test/3 test.pti"),
"1-shot-start-0125": get_header("./playback-test/4 test.pti"),
"1-shot-end-02": get_header("./playback-test/5 test.pti"),
"1-shot-end-0125": get_header("./playback-test/6 test.pti"),
"forward-loop-start-0025-loop-start-005": get_header("./playback-test/8 test.pti"),
"forward-loop-end-02-loop-end-018": get_header("./playback-test/9 test.pti"),
"backward-loop-start-0033-loop-start-01111-end-0234-loop-end-0197": get_header("./playback-test/10 test.pti"),
"pingpong-loop-start-0025-loop-start-0033-end-0250-loop-end-0190": get_header("./playback-test/11 test.pti"),
"slice-1-2-adjust-0025-2-2-adjust-008": get_header("./playback-test/12 test.pti"),
"48-slices": get_header("./playback-test/24 test.pti"),
"wavetable_window_32": get_header("./playback-test/28 test.pti"),
"wavetable_window_512": get_header("./playback-test/29 test.pti"),
"wavetable_window_1024_position_1": get_header("./playback-test/30 test.pti"),
"wavetable_window_32_position_343": get_header("./playback-test/31 test.pti"),
"wavetable_window_1024_position_9": get_header("./playback-test/32 test.pti"),
"granular_loop_backward": get_header("./playback-test/33 test.pti"),
"granular_loop_pingpong": get_header("./playback-test/34 test.pti"),
"granular_shape_triangle": get_header("./playback-test/35 test.pti"),
"granular_shape_gauss": get_header("./playback-test/36 test.pti"),
"granular_lenght_1_min": get_header("./playback-test/37 test.pti"),
"granular_lenght_250_max": get_header("./playback-test/38 test.pti"),
"granular_position_250_max_lenght_20": get_header("./playback-test/39 test.pti"),
"10ms": get_header("./sample-test/1 test-10ms.pti"),
"250ms": get_header("./sample-test/2 test-250ms.pti"),
"1000ms": get_header("./sample-test/3 test-1000ms.pti"),
"5000ms": get_header("./sample-test/4 test-5000ms.pti"),
"10000ms": get_header("./sample-test/5 test-10000ms.pti"),
}
@enum.unique
class HeaderOffset(enum.IntEnum):
"""Index to values in a .pti header."""
IS_WAVETABLE = 20
NAME = 21
SAMPLE_LENGTH = 60
# Wavetable
WAVETABLE_WINDOW_SIZE = 64
WAVETABLE_TOTAL_POSITIONS = 68
# Sample
SAMPLE_PLAYBACK = 76
PLAYBACK_START = 78
LOOP_START = 80
LOOP_END = 82
PLAYBACK_END = 84
WAVETABLE_POSITION = 88
# Volume envelope
VOLUME_ENVELOPE_AMOUNT = 92
VOLUME_ENVELOPE_ATTACK = 98
VOLUME_ENVELOPE_DECAY = 102
VOLUME_ENVELOPE_SUSTAIN = 104
VOLUME_ENVELOPE_RELEASE = 108
# Volume automation
VOLUME_AUTOMATION = 110
# Panning envelope
PANNING_ENVELOPE_AMOUNT = 112
PANNING_ENVELOPE_ATTACK = 118
PANNING_ENVELOPE_DECAY = 122
PANNING_ENVELOPE_SUSTAIN = 124
PANNING_ENVELOPE_RELEASE = 128
# Panning automation
PANNING_AUTOMATION = 130
# Cutoff envelope
CUTOFF_ENVELOPE_AMOUNT = 132
CUTOFF_ENVELOPE_ATTACK = 138
CUTOFF_ENVELOPE_DECAY = 142
CUTOFF_ENVELOPE_SUSTAIN = 144
CUTOFF_ENVELOPE_RELEASE = 148
# Cutoff automation
CUTOFF_AUTOMATION = 150
# Wavetable position envelope
WAVETABLE_POSITION_ENVELOPE_AMOUNT = 152
WAVETABLE_POSITION_ENVELOPE_ATTACK = 158
WAVETABLE_POSITION_ENVELOPE_DECAY = 162
WAVETABLE_POSITION_ENVELOPE_SUSTAIN = 164
WAVETABLE_POSITION_ENVELOPE_RELEASE = 168
# Wavetable position automation
WAVETABLE_POSITION_AUTOMATION = 170
# Granular position envelope
GRANULAR_POSITION_ENVELOPE_AMOUNT = 172
GRANULAR_POSITION_ENVELOPE_ATTACK = 178
GRANULAR_POSITION_ENVELOPE_DECAY = 182
GRANULAR_POSITION_ENVELOPE_SUSTAIN = 184
GRANULAR_POSITION_ENVELOPE_RELEASE = 188
# Granular position automation
GRANULAR_POSITION_AUTOMATION = 190
# Finetune envelope
FINETUNE_ENVELOPE_AMOUNT = 192
FINETUNE_ENVELOPE_ATTACK = 198
FINETUNE_ENVELOPE_DECAY = 202
FINETUNE_ENVELOPE_SUSTAIN = 204
FINETUNE_ENVELOPE_RELEASE = 208
# Finetune automation
FINETUNE_AUTOMATION = 210
# Volume LFO
VOLUME_LFO_TYPE = 212
VOLUME_LFO_STEPS = 213
VOLUME_LFO_AMOUNT = 216
# Panning automation LFO
PANNING_LFO_TYPE = 220
PANNING_LFO_STEPS = 221
PANNING_LFO_AMOUNT = 224
# Cutoff automation LFO
CUTOFF_LFO_TYPE = 228
CUTOFF_LFO_STEPS = 229
CUTOFF_LFO_AMOUNT = 232
# Wavetable position automation LFO
WAVETABLE_POSITION_LFO_TYPE = 236
WAVETABLE_POSITION_LFO_STEPS = 237
WAVETABLE_POSITION_LFO_AMOUNT = 240
# Granular position automation LFO
GRANULAR_POSITION_LFO_TYPE = 244
GRANULAR_POSITION_LFO_STEPS = 245
GRANULAR_POSITION_LFO_AMOUNT = 248
# Finetune automation LFO
FINETUNE_LFO_TYPE = 252
FINETUNE_LFO_STEPS = 253
FINETUNE_LFO_AMOUNT = 256
# Filter
FILTER_CUTOFF = 260
FILTER_RESONANCE = 264
FILTER_TYPE = 268
# Instrument parameters
TUNE = 270
FINETUNE = 271
VOLUME = 272
PANNING = 276
# Effects
DELAY_SEND = 278
# Slices
SLICE_N = 280
NUM_SLICES = 376
# Granular
GRANULAR_LENGTH = 378
GRANULAR_POSITION = 380
GRANULAR_SHAPE = 382
GRANULAR_LOOP_MODE = 383
# More effects
REVERB_SEND = 384
OVERDRIVE = 385
BIT_DEPTH = 386
@enum.unique
class HeaderStruct(struct.Struct, enum.Enum):
"""
Struct format strings to unpack values from a .pti file header.
Use the HeaderOffset enum to find the offset to unpack from.
"""
IS_WAVETABLE = "<?"
NAME = "<31s"
SAMPLE_LENGTH = "<L"
# Wavetable
WAVETABLE_WINDOW_SIZE = "<H"
WAVETABLE_TOTAL_POSITIONS = "<H"
# Sample
SAMPLE_PLAYBACK = "<B"
PLAYBACK_START = "<H"
LOOP_START = "<H"
LOOP_END = "<H"
PLAYBACK_END = "<H"
WAVETABLE_POSITION = "<H"
# Volume envelope
VOLUME_ENVELOPE_AMOUNT = "<f"
VOLUME_ENVELOPE_ATTACK = "<H"
VOLUME_ENVELOPE_DECAY = "<H"
VOLUME_ENVELOPE_SUSTAIN = "<f"
VOLUME_ENVELOPE_RELEASE = "<H"
# Volume automation
VOLUME_AUTOMATION = "<2s"
# Panning envelope
PANNING_ENVELOPE_AMOUNT = "<f"
PANNING_ENVELOPE_ATTACK = "<H"
PANNING_ENVELOPE_DECAY = "<H"
PANNING_ENVELOPE_SUSTAIN = "<f"
PANNING_ENVELOPE_RELEASE = "<H"
# Panning automation
PANNING_AUTOMATION = "<2s"
# Cutoff envelope
CUTOFF_ENVELOPE_AMOUNT = "<f"
CUTOFF_ENVELOPE_ATTACK = "<H"
CUTOFF_ENVELOPE_DECAY = "<H"
CUTOFF_ENVELOPE_SUSTAIN = "<f"
CUTOFF_ENVELOPE_RELEASE = "<H"
# Cutoff automation
CUTOFF_AUTOMATION = "<2s"
# Wavetable position envelope
WAVETABLE_POSITION_ENVELOPE_AMOUNT = "<f"
WAVETABLE_POSITION_ENVELOPE_ATTACK = "<H"
WAVETABLE_POSITION_ENVELOPE_DECAY = "<H"
WAVETABLE_POSITION_ENVELOPE_SUSTAIN = "<f"
WAVETABLE_POSITION_ENVELOPE_RELEASE = "<H"
# Wavetable position automation
WAVETABLE_POSITION_AUTOMATION = "<2s"
# Granular position envelope
GRANULAR_POSITION_ENVELOPE_AMOUNT = "<f"
GRANULAR_POSITION_ENVELOPE_ATTACK = "<H"
GRANULAR_POSITION_ENVELOPE_DECAY = "<H"
GRANULAR_POSITION_ENVELOPE_SUSTAIN = "<f"
GRANULAR_POSITION_ENVELOPE_RELEASE = "<H"
# Granular position automation
GRANULAR_POSITION_AUTOMATION = "<2s"
# Finetune envelope
FINETUNE_ENVELOPE_AMOUNT = "<f"
FINETUNE_ENVELOPE_ATTACK = "<H"
FINETUNE_ENVELOPE_DECAY = "<H"
FINETUNE_ENVELOPE_SUSTAIN = "<f"
FINETUNE_ENVELOPE_RELEASE = "<H"
# Finetune automation
FINETUNE_AUTOMATION = "<2s"
# Volume LFO
VOLUME_LFO_TYPE = "<B"
VOLUME_LFO_STEPS = "<B"
VOLUME_LFO_AMOUNT = "<f"
# Panning automation LFO
PANNING_LFO_TYPE = "<B"
PANNING_LFO_STEPS = "<B"
PANNING_LFO_AMOUNT = "<f"
# Cutoff automation LFO
CUTOFF_LFO_TYPE = "<B"
CUTOFF_LFO_STEPS = "<B"
CUTOFF_LFO_AMOUNT = "<f"
# Wavetable position automation LFO
WAVETABLE_POSITION_LFO_TYPE = "<B"
WAVETABLE_POSITION_LFO_STEPS = "<B"
WAVETABLE_POSITION_LFO_AMOUNT = "<f"
# Granular position automation LFO
GRANULAR_POSITION_LFO_TYPE = "<B"
GRANULAR_POSITION_LFO_STEPS = "<B"
GRANULAR_POSITION_LFO_AMOUNT = "<f"
# Finetune automation LFO
FINETUNE_LFO_TYPE = "<B"
FINETUNE_LFO_STEPS = "<B"
FINETUNE_LFO_AMOUNT = "<f"
# Filter
FILTER_CUTOFF = "<f"
FILTER_RESONANCE = "<f"
FILTER_TYPE = "<2s"
# Instrument parameters
TUNE = "<b"
FINETUNE = "<b"
VOLUME = "<B"
PANNING = "<B"
# Effects
DELAY_SEND = "<B"
# Slices
SLICE_N = "<H"
NUM_SLICES = "<B"
# Granular loop mode
GRANULAR_LENGTH = "<H"
GRANULAR_POSITION = "<H"
GRANULAR_SHAPE = "<B"
GRANULAR_LOOP_MODE = "<B"
# More effects
REVERB_SEND = "<B"
OVERDRIVE = "<B"
BIT_DEPTH = "<B"
# Find instrument name header position
# for i, v in enumerate(test_pti_header):
# if (iv := instrument_name_header[i]) != v:
# print(f'{i=}, {chr(v)=}, {chr(iv)=}')
# # i: 21-51 == instrument name
# # i: 56-61 == ???
# # i: 388-391 == ???
# Find volume header position
# for i, v in enumerate(test_pti_header):
# ivmax = pti_headers['volume_max'][i]
# ivnull = pti_headers['volume_null'][i]
# ivmin = pti_headers['volume_min'][i]
# if any(iv != v for iv in (ivmax, ivnull, ivmin)):
# print(f'{i=}, {v=}, {ivmax=}, {ivnull=}, {ivmin=}')
# # i: 272 == volume
# Find panning header position
# for i, v in enumerate(test_pti_header):
# ivmin = pti_headers['panning_min'][i]
# ivmax = pti_headers['panning_max'][i]
# if any(iv != v for iv in (ivmax, ivmin)):
# print(f'{i=}, {v=}, {ivmax=}, {ivmin=}')
# # i: 276 == panning
def _cmp_head(
*headers: str,
default_header: bytes = test_pti_header,
header_map: dict[str, bytes] = pti_headers,
) -> None:
"""Compare .pti file header(s) to the default header and show which bytes are different."""
for i, v in enumerate(default_header):
if 21 <= i <= 51:
continue # Instrument name
ivs = {header: header_map[header][i] for header in headers}
if any(iv != v for iv in ivs.values()):
if i in list(HeaderOffset):
print(HeaderOffset(i))
print("-" * 80)
dbg = {
k: {
"int": v,
"bytes": repr(bytes([v])),
}
for k, v in ivs.items()
}
print(f"\n{i=}, default: int: {v} bytes: {bytes([v])!r}" f"{json.dumps(dbg, indent=2)}")
##
# Find header offsets
##
# _cmp_head('tune_min', 'tune_max', 'tune_neg12') # 270
# _cmp_head('finetune_min', 'finetune_max') # 271
# _cmp_head('filter_lp', 'filter_bp', 'filter_hp') # 268 / 269
# _cmp_head('overdrive') # 385
# _cmp_head('bit_depth') # 386
# _cmp_head('lp_cutoff', 'hp_cutoff_rez', 'bp_cutoff_rez') # 262-263 = cutoff (???) / 264-267 = resonance (???)
# _cmp_head('reverb_max', 'reverb_min') # 384
# _cmp_head('delay_max', 'delay_min') # 278
# _cmp_head(
# 'loop_fwd',
# 'loop_bkwd',
# 'loop_pingpong',
# 'play_slice',
# 'play_beat_slice',
# 'play_wavetable',
# 'play_granular',
# ) # 76
# _cmp_head(
# 'volume_automation_off',
# 'volume_automation_lfo',
# ) # 110-111
# _cmp_head(
# 'panning_automation_envelope',
# 'panning_automation_lfo',
# ) # 130-131
# _cmp_head(
# 'cutoff_automation_envelope',
# 'cutoff_automation_lfo',
# ) # 150-151
# _cmp_head(
# 'wavetable_automation_envelope',
# 'wavetable_automation_lfo',
# ) # 170-171
# _cmp_head(
# 'granular_pos_automation_envelope',
# 'granular_pos_automation_lfo',
# ) # 190-191
# _cmp_head(
# 'finetune_envelope',
# 'finetune_lfo',
# ) # 210-211
# _cmp_head(
# 'lp_100_0',
# 'hp_100_0',
# 'lp_100_100',
# 'hp_100_100',
# 'lp_50_0',
# 'hp_50_0',
# 'lp_0_0',
# 'hp_0_0',
# 'lp_0_100',
# 'hp_0_100',
# 'lp_50_50',
# 'hp_50_50',
# 'lp_100_50',
# 'hp_100_50',
# 'lp_0_50',
# 'hp_0_50',
# ) # 260-263 / 263-266
# _cmp_head('vol_env_attack_10', 'vol_env_attack_5') # 98-99
# _cmp_head('vol_env_decay_10', 'vol_env_decay_5') # 102-103
# _cmp_head('vol_env_sustain_50', 'vol_env_sustain_0') # 104-107
# _cmp_head('vol_env_release_10', 'vol_env_release_0') # 108-109
# _cmp_head('vol_env_amount_50', 'vol_env_amount_0') # 92-95
# _cmp_head('vol_lfo_rev_saw', 'vol_lfo_saw', 'vol_lfo_square', 'vol_lfo_random') # 212: 0, 1, 2, 3, 4
# _cmp_head('vol_lfo_16_steps', 'vol_lfo_6_steps', 'vol_lfo_3_2_steps', 'vol_lfo_1_64_steps') # 213: 0-23
# _cmp_head('vol_lfo_amount_100', 'vol_lfo_amount_0') # 218-219
# _cmp_head('pan_lfo_rev_saw', 'pan_lfo_rev_random') # 220
# _cmp_head('pan_lfo_1_48_step', 'pan_lfo_1_128_steps', 'pan_lfo_24_steps') # 221
# _cmp_head(
# 'pan_lfo_amount_80', 'pan_lfo_amount_66', 'pan_lfo_amount_25', 'pan_lfo_amount_10', 'pan_lfo_amount_100'
# ) # 224-227
# _cmp_head('cutoff_lfo_square_96_steps_amount38') # 228 / 228 / 232-235
# _cmp_head('wavetable_lfo_random_2_steps_amount_8') # 236 / 237 / 240-243
# _cmp_head('granular_lfo_saw_32_steps_amount_90') # 244 etc.
# _cmp_head('finetune_lfo_square_3_steps_amount_100') # # 252 etc.
# _cmp_head("1-shot-start-002", "1-shot-start-0025", "1-shot-start-0125")
# _cmp_head("1-shot-end-02", "1-shot-end-0125",)
# _cmp_head(
# "forward-loop-start-0025-loop-start-005",
# "forward-loop-end-02-loop-end-018"
# )
# _cmp_head("backward-loop-start-0033-loop-start-01111-end-0234-loop-end-0197")
# _cmp_head("pingpong-loop-start-0025-loop-start-0033-end-0250-loop-end-0190")
# _cmp_head("slice-1-2-adjust-0025-2-2-adjust-008")
# _cmp_head("slice-1-2-adjust-0025-2-2-adjust-008", "48-slices")
# _cmp_head("granular_loop_backward", "granular_loop_pingpong") # 383
# _cmp_head("granular_shape_triangle", "granular_shape_gauss") # 382
# _cmp_head("wavetable_window_32", "wavetable_window_512", "wavetable_window_1024_position_1") # 64-65
# _cmp_head(
# "wavetable_window_1024_position_1",
# "wavetable_window_1024_position_9",
# "wavetable_window_32_position_343",
# ) # 88-89 = position (short)
# _cmp_head("granular_lenght_1_min", "granular_lenght_250_max", "granular_position_250_max_lenght_20") # 378-379
# _cmp_head("10ms", "250ms", "1000ms", "5000ms", "10000ms")
def is_pti(header: bytes) -> bool:
"""Return True if a byte string has the characteristics of a .pti file header."""
is_pti = False
if len(header) == 392 and header[0:2] == b"TI":
known_0 = [
3,
17, 18, 19,
52, 53, 54, 55,
66, 67,
70, 71, 72, 73, 74, 75,
77,
86, 87,
90, 91,
96, 97,
100, 101,
116, 117,
120, 121,
136, 137,
140, 141,
156, 157,
160, 161,
176, 177,
180, 181,
196, 197,
200, 201,
214, 215,
222, 223,
230, 231,
238, 239,
246, 247,
254, 255,
273, 274,
275, 277,
279,
387,
]
for offset in known_0:
assert (value := header[offset]) == 0, f'{offset=} {value=}'
known_1 = [2, 4, 7, 13, 16]
for offset in known_1:
assert (value := header[offset]) == 1, f'{offset=} {value=}'
known_0_or_1 = [6]
for offset in known_0_or_1:
assert (value := header[offset]) in {0, 1}, f'{offset=} {value=}'
known_9 = [8, 9, 10, 11]
for offset in known_9:
assert (value := header[offset]) == 9, f'{offset=} {value=}'
assert (value := header[5]) in (4, 5), f'{value=}'
assert (value := header[12]) == 116, f'{value=}'
assert (value := header[14]) in (102, 110), f'{value=}'
assert (value := header[15]) == 102, f'{value=}'
is_pti = True
return is_pti
# Mystery bytes
# These seem to be related to the sample size, current instrument - previous instrument = instrument length
# _unknown = [56, 57, 58, 59]
# Not sure...
# _unknown = [388, 389, 390, 391]
# print(_unknown)
# print(struct.unpack('<L', bytearray([test_pti_header[n] for n in _unknown])))
# print([test_pti_header[n] for n in _unknown])
# for key, value in pti_headers.items():
# print(key, [value[n] for n in _unknown])
# print(key, struct.unpack('<L', bytearray([value[n] for n in _unknown])))
#
#
# for key, header in pti_headers.items():
# print(key)
# print(header[3])
# is_pti(header)
# if os.path.exists('./Instruments'):
# # https://polyend.com/files/Instruments.zip
# for fname in glob.glob('./Instruments/**/*.pti'):
# print(fname)
# header = get_header(fname)
# print(header[3])
# is_pti(header)
def _unpack(header: bytes, field: str) -> bytes | int | float | bool:
"""Unpack a value from a .pti file header."""
assert is_pti(header), "Not a .pti header"
assert isinstance(
value := HeaderStruct[field].unpack_from(header, HeaderOffset[field])[0],
(bytes, int, float),
), type(value)
return value
def _test(func: Callable[[bytes], Any], header: bytes, expected: Any) -> None:
"""Assert that calling func with the given header returns the expected value."""
assert (value := func(header)) == expected, f"{func=} => {value=} ({expected=})"
##
# Instrument name
##
def get_name(header: bytes) -> str:
"""Return instrument name."""
assert isinstance(value := _unpack(header, "NAME"), bytes), type(value)
return value.rstrip(b"\x00").decode("ascii")
_test(get_name, test_pti_header, "test")
_test(get_name, pti_headers["instrument_name"], "ABCDEFGHIJKLMNOPQRSTUVWXYZabcde")
##
# Sample length
##
def get_sample_length(header: bytes) -> int:
"""Return sample length."""
assert isinstance(value := _unpack(header, "SAMPLE_LENGTH"), int), type(value)
assert 0 <= value <= 4294967295
return value
_test(get_sample_length, test_pti_header, 0)
_test(get_sample_length, pti_headers["10ms"], 10 * 44.1)
_test(get_sample_length, pti_headers["250ms"], 250 * 44.1)
_test(get_sample_length, pti_headers["1000ms"], 1000 * 44.1)
_test(get_sample_length, pti_headers["5000ms"], 5000 * 44.1)
_test(get_sample_length, pti_headers["10000ms"], 10000 * 44.1)
##
# Instrument parameters
##
def get_volume(header: bytes) -> int:
"""Return volume value (0-100)."""
assert isinstance(value := _unpack(header, "VOLUME"), int), type(value)
assert 0 <= value <= 100, value
return value
_test(get_volume, test_pti_header, 50)
_test(get_volume, pti_headers["volume_null"], 0)
_test(get_volume, pti_headers["volume_min"], 1)
_test(get_volume, pti_headers["volume_max"], 100)
def get_panning(header: bytes) -> int:
"""Return panning value (0-100)."""
assert isinstance(value := _unpack(header, "PANNING"), int), type(value)
assert 0 <= value <= 100, value
return value
_test(get_panning, test_pti_header, 50)
_test(get_panning, pti_headers["panning_min"], 0)
_test(get_panning, pti_headers["panning_max"], 100)
def get_tune(header: bytes) -> int:
"""Return tune value (-/+24)."""
assert isinstance(value := _unpack(header, "TUNE"), int), type(value)
assert -24 <= value <= 24, value
return value
_test(get_tune, test_pti_header, 0)
_test(get_tune, pti_headers["tune_min"], -24)
_test(get_tune, pti_headers["tune_max"], 24)
_test(get_tune, pti_headers["tune_neg12"], -12)
def get_finetune(header: bytes) -> int:
"""Return finetune value (-/+100)."""
assert isinstance(value := _unpack(header, "FINETUNE"), int), type(value)
assert -100 <= value <= 100, value
return value
_test(get_finetune, test_pti_header, 0)
_test(get_finetune, pti_headers["finetune_min"], -100)
_test(get_finetune, pti_headers["finetune_max"], 100)
##
# Filter parameters
##
def get_filter_cutoff(header: bytes) -> float:
"""Return filter cutoff value (0.0-1.0)."""
assert isinstance(value := _unpack(header, "FILTER_CUTOFF"), float), type(value)
assert 0.0 <= value <= 1.0, value
return value
_test(get_filter_cutoff, test_pti_header, 1.0)
_test(get_filter_cutoff, pti_headers["lp_100_0"], 1.0)
_test(get_filter_cutoff, pti_headers["hp_100_0"], 1.0)
_test(get_filter_cutoff, pti_headers["lp_50_0"], 0.5000002384185791)
_test(get_filter_cutoff, pti_headers["hp_50_0"], 0.5000002384185791)
_test(get_filter_cutoff, pti_headers["lp_0_0"], 0.0)
_test(get_filter_cutoff, pti_headers["hp_0_0"], 0.0)
_test(get_filter_cutoff, pti_headers["lp_100_100"], 1.0)
_test(get_filter_cutoff, pti_headers["hp_100_100"], 1.0)
def get_filter_resonance(header: bytes) -> float:
"""Return filter resonance value (0.0-+4.300000190734863)."""
assert isinstance(value := _unpack(header, "FILTER_RESONANCE"), float), type(value)
# This value range looks weird, but it seems to be correct...
assert 0.0 <= value <= 4.300000190734863, value
return value
_test(get_filter_resonance, test_pti_header, 0.0)
_test(get_filter_resonance, pti_headers["lp_100_100"], 4.300000190734863)
_test(get_filter_resonance, pti_headers["hp_100_100"], 4.300000190734863)
_test(get_filter_resonance, pti_headers["lp_100_50"], 2.150000810623169)
_test(get_filter_resonance, pti_headers["hp_100_50"], 2.1929996013641357)
_test(get_filter_resonance, pti_headers["lp_100_0"], 0.0)
_test(get_filter_resonance, pti_headers["hp_100_0"], 0.0)
_test(get_filter_resonance, pti_headers["lp_0_50"], 2.1929996013641357)
_test(get_filter_resonance, pti_headers["hp_0_50"], 2.192999839782715)
@enum.unique
class FilterType(bytes, enum.Enum):
"""Filter type."""
# This is probably filter type (0/1/2) + on/off (0/1)
DISABLED = b"\x00\x00"
LOW_PASS = b"\x00\x01"
HIGH_PASS = b"\x01\x01"
BAND_PASS = b"\x02\x01"
def get_filter_type(header: bytes) -> FilterType:
"""Return filter type value."""
assert isinstance(value := _unpack(header, "FILTER_TYPE"), bytes), type(value)
return FilterType(value)
_test(get_filter_type, test_pti_header, FilterType.DISABLED)
for key in [
"filter_lp",
"lp_100_0",
"lp_50_0",
"lp_0_0",
"lp_100_100",
"lp_100_50",
"lp_50_50",
"lp_0_100",
"lp_0_50",
]:
_test(get_filter_type, pti_headers[key], FilterType.LOW_PASS)
for key in [
"filter_hp",
"hp_100_0",
"hp_50_0",
"hp_0_0",
"hp_100_100",
"hp_100_50",
"hp_50_50",
"hp_0_100",
"hp_0_50",
]:
_test(get_filter_type, pti_headers[key], FilterType.HIGH_PASS)
_test(get_filter_type, pti_headers["filter_bp"], FilterType.BAND_PASS)
##
# Effects
##
def get_overdrive(header: bytes) -> int:
"""Return overdrive value (0-100)."""
assert isinstance(value := _unpack(header, "OVERDRIVE"), int), type(value)
assert 0 <= value <= 100, value
return value
_test(get_overdrive, test_pti_header, 0)
_test(get_overdrive, pti_headers["overdrive"], 100)
def get_bit_depth(header: bytes) -> int:
"""Return bit depth value (4-16)."""
assert isinstance(value := _unpack(header, "BIT_DEPTH"), int), type(value)
assert 4 <= value <= 16, value
return value
_test(get_bit_depth, test_pti_header, 16)
_test(get_bit_depth, pti_headers["bit_depth"], 4)
def get_delay_send(header: bytes) -> int:
"""Return delay send value (0-100)."""
assert isinstance(value := _unpack(header, "DELAY_SEND"), int), type(value)
assert 0 <= value <= 100, value
return value
_test(get_delay_send, test_pti_header, 0)
_test(get_delay_send, pti_headers["delay_min"], 1)
_test(get_delay_send, pti_headers["delay_max"], 100)
def get_reverb_send(header: bytes) -> int:
"""Return reverb send value (0-100)."""
assert isinstance(value := _unpack(header, "REVERB_SEND"), int), type(value)
assert 0 <= value <= 100, value
return value
_test(get_reverb_send, test_pti_header, 0)
_test(get_reverb_send, pti_headers["reverb_min"], 1)
_test(get_reverb_send, pti_headers["reverb_max"], 100)
##
# Sample playback
##
@enum.unique
class SamplePlayback(enum.IntEnum):
"""Sample playback mode."""
ONE_SHOT = 0
FORWARD_LOOP = 1
BACKWARD_LOOP = 2
PINGPONG_LOOP = 3
SLICE = 4
BEAT_SLICE = 5
WAVETABLE = 6
GRANULAR = 7
def get_sample_playback(header: bytes) -> SamplePlayback:
"""Return sample playback mode."""
assert isinstance(value := _unpack(header, "SAMPLE_PLAYBACK"), int), type(value)
return SamplePlayback(value)
_test(get_sample_playback, test_pti_header, SamplePlayback.ONE_SHOT)
_test(get_sample_playback, pti_headers["loop_fwd"], SamplePlayback.FORWARD_LOOP)
_test(get_sample_playback, pti_headers["loop_bkwd"], SamplePlayback.BACKWARD_LOOP)
_test(get_sample_playback, pti_headers["loop_pingpong"], SamplePlayback.PINGPONG_LOOP)
_test(get_sample_playback, pti_headers["play_slice"], SamplePlayback.SLICE)
_test(get_sample_playback, pti_headers["play_beat_slice"], SamplePlayback.BEAT_SLICE)
_test(get_sample_playback, pti_headers["play_wavetable"], SamplePlayback.WAVETABLE)
_test(get_sample_playback, pti_headers["play_granular"], SamplePlayback.GRANULAR)
##
# Instrument automation
##
@enum.unique
class InstrumentAutomation(bytes, enum.Enum):
"""Instrument automation mode."""
# This is probably automation type (0/1) + on/off (0/1)
OFF = b"\x00\x00"
ENVELOPE = b"\x00\x01"
LFO = b"\x01\x01"
@enum.unique
class AutomationLfoType(enum.IntEnum):
"""Instrument automation LFO type."""