audacity-swimming-pool.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# Audacity script to prepare long audio books or podcasts for listening in the swimming pool.
# The script will amplify the audio, because the volume usually is too low for the underwater speakers.
# It will also add DTMF tones every XX minutes, so the listener knows how much time has passed.
# It is very convenient to know how much time has passed, especially in Ukraine, when there is electricity outage. When you don't see the clock. 
# The script will also add labels every XX minutes, so you can export multiple files for easier navigation between parts.

# Before running the script, make sure Audacity is running first and that mod-script-pipe is enabled
# Requires Python 2.7 or later. Python 3 is strongly recommended.


import os
import sys
import json

if sys.platform == 'win32':
    print("pipe-test.py, running on windows")
    TONAME = '\\\\.\\pipe\\ToSrvPipe'
    FROMNAME = '\\\\.\\pipe\\FromSrvPipe'
    EOL = '\r\n\0'
else:
    print("pipe-test.py, running on linux or mac")
    TONAME = '/tmp/audacity_script_pipe.to.' + str(os.getuid())
    FROMNAME = '/tmp/audacity_script_pipe.from.' + str(os.getuid())
    EOL = '\n'

print("Write to  \"" + TONAME +"\"")
if not os.path.exists(TONAME):
    print(" ..does not exist.  Ensure Audacity is running with mod-script-pipe.")
    sys.exit()

print("Read from \"" + FROMNAME +"\"")
if not os.path.exists(FROMNAME):
    print(" ..does not exist.  Ensure Audacity is running with mod-script-pipe.")
    sys.exit()

print("-- Both pipes exist.  Good.")

TOFILE = open(TONAME, 'w')
print("-- File to write to has been opened")
FROMFILE = open(FROMNAME, 'rt')
print("-- File to read from has now been opened too\r\n")


def send_command(command):
    """Send a single command."""
    print("Send: >>> \n"+command)
    TOFILE.write(command + EOL)
    TOFILE.flush()

def get_response():
    """Return the command response."""
    result = ''
    line = ''
    while True:
        result += line
        line = FROMFILE.readline()
        if line == '\n' and len(result) > 0:
            break
    return result

def do_command(command):
    """Send one command, and return the response."""
    send_command(command)
    response = get_response()
    print("Rcvd: <<< \n" + response)
    return response

def quick_test():
    """Example list of commands."""
    do_command('Help: Command=Help')
    do_command('Help: Command="GetInfo"')

quick_test()


# settings
trackDuration = 2700
toneDuration = 1

do_command('SelectAll:')
do_command('Amplify: Ratio=2.238 AllowClipping=0')

info = do_command('GetInfo: Type=Tracks')
infoJson = json.loads(info.replace("BatchCommand finished: OK", ""))
duration = infoJson[0].get("end") - infoJson[0].get("start")
print(duration)

currentTime = 0
while currentTime < duration:
    do_command('Select: Start=' + str(currentTime) + ' End=' + str(currentTime + toneDuration))
    do_command('DtmfTones:')
    currentTime += trackDuration
    
do_command('SelectAll:')
do_command('RegularIntervalLabels: mode=Interval interval=' +str(trackDuration))