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import sys, io, os
from PyQt4 import QtCore, QtGui, uic
from os.path import expanduser
import subprocess as sp
import numpy
from PIL import Image
import tempfile
from shutil import rmtree
import atexit
import time
from collections import OrderedDict
class Core():
def __init__(self):
self.FFMPEG_BIN = self.findFfmpeg()
self.tempDir = os.path.join(tempfile.gettempdir(), 'audio-visualizer-python-data')
if not os.path.exists(self.tempDir):
os.makedirs(self.tempDir)
atexit.register(self.deleteTempDir)
def findFfmpeg(self):
if sys.platform == "win32":
return "ffmpeg.exe"
else:
try:
with open(os.devnull, "w") as f:
sp.check_call(['ffmpeg', '-version'], stdout=f, stderr=f)
return "ffmpeg"
except:
return "avconv"
def readAudioFile(self, filename, parent):
command = [ self.FFMPEG_BIN,
'-i', filename]
try:
fileInfo = sp.check_output(command, stderr=sp.STDOUT, shell=False)
except sp.CalledProcessError as ex:
fileInfo = ex.output
pass
info = fileInfo.decode("utf-8").split('\n')
for line in info:
if 'Duration' in line:
d = line.split(',')[0]
d = d.split(' ')[3]
d = d.split(':')
duration = float(d[0])*3600 + float(d[1])*60 + float(d[2])
command = [ self.FFMPEG_BIN,
'-i', filename,
'-f', 's16le',
'-acodec', 'pcm_s16le',
'-ar', '44100', # ouput will have 44100 Hz
'-ac', '1', # mono (set to '2' for stereo)
'-']
in_pipe = sp.Popen(command, stdout=sp.PIPE, stderr=sp.DEVNULL, bufsize=10**8)
completeAudioArray = numpy.empty(0, dtype="int16")
progress = 0
lastPercent = None
while True:
if self.canceled:
break
# read 2 seconds of audio
progress = progress + 4
raw_audio = in_pipe.stdout.read(88200*4)
if len(raw_audio) == 0:
break
audio_array = numpy.fromstring(raw_audio, dtype="int16")
completeAudioArray = numpy.append(completeAudioArray, audio_array)
percent = int(100*(progress/duration))
if percent >= 100:
percent = 100
if lastPercent != percent:
string = 'Loading audio file: '+str(percent)+'%'
parent.progressBarSetText.emit(string)
parent.progressBarUpdate.emit(percent)
lastPercent = percent
in_pipe.kill()
in_pipe.wait()
# add 0s the end
completeAudioArrayCopy = numpy.zeros(len(completeAudioArray) + 44100, dtype="int16")
completeAudioArrayCopy[:len(completeAudioArray)] = completeAudioArray
completeAudioArray = completeAudioArrayCopy
return completeAudioArray
def deleteTempDir(self):
try:
rmtree(self.tempDir)
except FileNotFoundError:
pass
def cancel(self):
self.canceled = True
def reset(self):
self.canceled = False
@staticmethod
def stringOrderedDict(dictionary):
sorted_ = OrderedDict(sorted(dictionary.items(), key=lambda t: t[0]))
return repr(sorted_)
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