PirateRadio.py

#!/usr/bin/env python
# Pirate Radio
# Author: Wynter Woods (Make Magazine)

import os
import sys
import subprocess
import configparser
import re
import random
import threading
import time


fm_process = None
on_off = ["off", "on"]

frequency = 87.9
shuffle = False
repeat_all = False
merge_audio_in = False
play_stereo = True

music_pipe_r,music_pipe_w = os.pipe()
microphone_pipe_r,microphone_pipe_w = os.pipe()

def main():
	daemonize()
	setup()
	files = build_file_list()
	if repeat_all == True:
		while(True):
			play_songs(files)
	else:
		play_songs(files)
	return 0



def build_file_list():
	file_list = []
	for root, folders, files in os.walk("/pirateradio"):
		folders.sort()
		files.sort()
		for filename in files:
			if re.search(".(aac|mp3|wav|flac|m4a)$", filename) != None:
				file_list.append(os.path.join(root, filename))
	return file_list



def play_songs(file_list):
	print("Playing songs to frequency ", str(frequency))
	print("Shuffle is " + on_off[shuffle])
	print("Repeat All is " + on_off[repeat_all])
	#print("Stereo playback is " + on_off[play_stereo])
	
	if shuffle == True:
		random.shuffle(file_list)
	with open(os.devnull, "w") as dev_null:
		for filename in file_list:
			print("Playing ",filename)
			subprocess.call(["ffmpeg","-i",filename,"-f","s16le","-acodec","pcm_s16le","-ac", "2" if play_stereo else "1" ,"-ar","44100","-"],stdout=music_pipe_w, stderr=dev_null)



def read_config():
	global frequency
	global shuffle
	global repeat_all
	global play_stereo
	try:
		config = configparser.ConfigParser()
		config.read("/pirateradio/pirateradio.config")
		
	except:
		print("Error reading from config file.")
	else:
		play_stereo = config.get("pirateradio", 'stereo_playback', fallback=True)
		frequency = config.get("pirateradio",'frequency')
		shuffle = config.getboolean("pirateradio",'shuffle',fallback=False)
		repeat_all = config.getboolean("pirateradio",'repeat_all', fallback=False)


def daemonize():
	fpid=os.fork()
	if fpid!=0:
		sys.exit(0)


def setup():
	#threading.Thread(target = open_microphone).start()

	global frequency
	read_config()
	# open_microphone()
	run_pifm()


def run_pifm(use_audio_in=False):
	global fm_process
	with open(os.devnull, "w") as dev_null:
		fm_process = subprocess.Popen(["/root/pifm","-",str(frequency),"44100", "stereo" if play_stereo else "mono"], stdin=music_pipe_r, stdout=dev_null)

		#if use_audio_in == False:
		#else:
		#	fm_process = subprocess.Popen(["/root/pifm2","-",str(frequency),"44100"], stdin=microphone_pipe_r, stdout=dev_null)

def record_audio_input():
	return subprocess.Popen(["arecord", "-fS16_LE", "--buffer-time=50000", "-r", "44100", "-Dplughw:1,0", "-"], stdout=microphone_pipe_w)

def open_microphone():
	global fm_process
	audio_process = None
	if os.path.exists("/proc/asound/card1"):
		audio_process = record_audio_input()
		run_pifm(merge_audio_in)
	else:
		run_pifm()



main()