# audio_frames.py

# audio_frames.py

import math, wave, array

dir='C://py//audio//'

sin = math.sin
pi = math.pi
twopi = 2*pi

frameRate = 25 #frames per second
frameTime = 1/float(frameRate)

sampleRate = 44100 #44100 Samples per Second

length = 0.2 #0.2 seconds or you can define it with frame times, i.e. for 3 frames it'd be 3 * frameTime
numSamples = int(length * sampleRate)

freq = 440
cyclesPerSample = float(freq)/sampleRate

volumeScale = (.99)*32767

sdata = array.array('h') #Beep Sound Array
for samp in xrange(numSamples):
    phi = samp * cyclesPerSample
    phi -= int(phi)

    sdata.append(int(round(volumeScale * sin(twopi * phi))))

totalFrames = 250
totalSamps = totalFrames * frameTime * sampleRate
targetFrames = [21, 47, 65, 80, 120, 140, 170, 200, 220]

# Builds frame triggers in terms of samples
trigger = [int(frm * frameTime * sampleRate) for frm in targetFrames]

endData = array.array('h')
curSamp = 0
while curSamp < totalSamps:
    if curSamp in trigger:
        for smp in sdata:
            endData.append(smp)
        curSamp += numSamples

    else:
        endData.append(0)
        curSamp += 1


f = wave.open(dir+'frames.wav', 'w')
f.setparams((1, 2, sampleRate, 0, "NONE", "Uncompressed"))
f.writeframes(endData.tostring())
f.close()