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#!/usr/bin/env python3
#
# loopertrx: import/export audio data from some looper pedals.
#
# Copyright (C) 2017 Reiner Herrmann <reiner@reiner-h.de>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
import random
import struct
import sys
import argparse
import usb.core
import usb.util
LOOPER_VID = 0x0483
LOOPER_PID = 0x572a
ENDPOINT_IN = 0x81
ENDPOINT_OUT = 0x01
COMMAND_SIZE = 0xfe
COMMAND_DATA = 0xff
class USBLooper():
def __init__(self):
self.dev = usb.core.find(idVendor=LOOPER_VID, idProduct=LOOPER_PID)
if not self.dev:
raise FileNotFoundError("Device not found.")
if self.dev.is_kernel_driver_active(0):
self.dev.detach_kernel_driver(0)
self.dev.set_configuration()
def random_tag(self):
return random.randint(0, 1 << 32 - 1)
def mass_storage_header(self, data_len, cdb_len, tag=None):
header = "USBC".encode('ascii')
if not tag:
tag = self.random_tag()
flags = 0x80
target = 0x00
header += struct.pack('<iiBBB', tag, data_len, flags, target, cdb_len)
return header
def command_header(self, command, data_len, flag1, flag2, tag=None):
cdb = bytes([0xcb, command, flag1, 0x00, flag2, 0x00, 0x00, 0x00, 0x00, 0x00])
header = self.mass_storage_header(data_len, len(cdb), tag) + cdb
header += bytes([0x00 for padding in range(31-len(header))])
return header
def ack_data(self):
self.dev.read(ENDPOINT_IN, 32)
def get_size(self):
header = self.command_header(COMMAND_SIZE, 5, 0x00, 0x01)
self.dev.write(ENDPOINT_OUT, header)
length = self.dev.read(ENDPOINT_IN, 100)
self.ack_data()
if length[0] == 1:
return 0
return length[1] + (length[2] << 8) + (length[3] << 16) + (length[4] << 24)
def submit_data_len(self, size, tag=None):
header = self.command_header(COMMAND_SIZE, 5, 0x00, 0x00, tag)
data_size = struct.pack('<bi', 0x00, size)
self.dev.write(ENDPOINT_OUT, header)
self.dev.write(ENDPOINT_OUT, data_size)
self.ack_data()
def get_data(self, nbytes):
header = self.command_header(COMMAND_DATA, nbytes, 0x01, 0x01)
self.dev.write(ENDPOINT_OUT, header)
buf = self.dev.read(ENDPOINT_IN, nbytes)
self.ack_data()
return buf
def send_data(self, data, tag=None):
header = self.command_header(COMMAND_DATA, len(data), 0x01, 0x00, tag)
self.dev.write(ENDPOINT_OUT, header)
self.dev.write(ENDPOINT_OUT, data)
self.ack_data()
def write_wav_header(self, outfile, data_size):
header_size = 44
header = "RIFF".encode('ascii')
header += struct.pack('<i', data_size + header_size - 8)
header += "WAVE".encode('ascii')
header += "fmt ".encode('ascii')
fmt = 0x01 # PCM
nchan = 1
rate = 48000
fsize = 3
bps = rate * fsize
bits = 24
header += struct.pack('<ihhiihh', 16, fmt, nchan, rate, bps, fsize, bits)
header += "data".encode('ascii')
header += struct.pack('<i', data_size)
outfile.write(header)
def receive_file(self, filename):
size = self.get_size()
if size == 0:
print("No data available.")
sys.exit(0)
with open(filename, 'wb') as outfile:
self.write_wav_header(outfile, size)
print("Receiving ", end='', flush=True)
while size > 0:
bufsize = (size >= 65536) and 65536 or size
# data needs to be transferred in multiples of 1k blocks
padding = (1024 - (bufsize % 1024)) % 1024
buf = self.get_data(bufsize + padding)
print('.', end='', flush=True),
outfile.write(buf[:bufsize])
size -= bufsize
print(" Done.")
def transmit_file(self, filename):
with open(filename, 'rb') as infile:
content = infile.read()
tag = self.random_tag()
# skip first 44 bytes for now; we assume valid file. TODO: validate
content = content[44:]
content_size = len(content)
print("Transmitting ", end='', flush=True)
while len(content) > 0:
buf = content[:65536]
padsize = (1024 - (len(buf) % 1024)) % 1024
buf += b'\x00' * padsize
self.send_data(buf, tag)
print('.', end='', flush=True),
content = content[65536:]
self.submit_data_len(content_size, tag)
print(" Done.")
def main():
argp = argparse.ArgumentParser()
argp.add_argument('action', choices=['rx', 'tx'])
argp.add_argument('filename')
args = argp.parse_args()
try:
dev = USBLooper()
except FileNotFoundError as e:
print(e)
sys.exit(1)
if args.action == 'rx':
dev.receive_file(args.filename)
elif args.action == 'tx':
dev.transmit_file(args.filename)
if __name__ == "__main__":
main()
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