def genFlashSequence(flashCentreTimesSecs, idealFlashDurationSecs, sequenceDurationSecs, frameRate, gapValue=(0,0,0), flashValue=(1.0,1.0,1.0)):
"""\
Generates the pixel colour values needed for each frame to render flashes corresponding to the timings specified.
:param beepCentreTimeSecs: A list or iterable of the centre times of each beep (in seconds since the beginning of the sequence)
:param idealFlashDurationSecs: ideal duration of a flash in seconds
:param sequenceDurationSecs: total sequence duration in seconds
:param sampleRateHz: The final output sample rate in Hz
:param gapValue: The value for non flash pixels
:param flashValue: The value for flash pixels
:returns: An iterable that generates the pixel colours for each frame starting with the first frame
"""
flashDurationSamples = calcNearestDurationForExactNumberOfCycles(idealFlashDurationSecs, frameRate)
flashStartEndSamples = genSequenceStartEnds(flashCentreTimesSecs, flashDurationSamples, 1.0, frameRate)
nSamples = sequenceDurationSecs * frameRate
def gapGen():
while True:
yield gapValue
def flashGen():
while True:
yield flashValue
seqIter = genSequenceFromSampleIndices(flashStartEndSamples, gapGen, flashGen)
return itertools.islice(seqIter, 0, nSamples)
def genBeepSequence(beepCentreTimesSecs, idealBeepDurationSecs, sequenceDurationSecs, sampleRateHz, toneHz, amplitude):
"""\
Generates the audio sample values needed to create audio data containing beeps corresponding to the timings specified.
:param beepCentreTimeSecs: A list or iterable of the centre times of each beep (in seconds since the beginning of the sequence)
:param idealBeepDurationSecs: ideal duration of a beep in seconds
:param sequenceDurationSecs: total sequence duration in seconds
:param sampleRateHz: The final output sample rate in Hz
:param toneHz: The tone frequence in Hz for the beeps
:param amplitude: The peak amplitude for the beeps
:returns: An iterable that generates the sample values starting with the first sample value
"""
beepDurationSamples = calcNearestDurationForExactNumberOfCycles(idealBeepDurationSecs, toneHz)
beepStartEndSamples = genSequenceStartEnds(beepCentreTimesSecs, beepDurationSamples, 1.0, sampleRateHz)
nSamples = sequenceDurationSecs * sampleRateHz
def toneGenFactory():
return GenTone(sampleRateHz, amplitude, toneHz, 0.0)
def silenceGen():
while True:
yield 0.0
seqIter = genSequenceFromSampleIndices(beepStartEndSamples, silenceGen, toneGenFactory)
return itertools.islice(seqIter, 0, nSamples)
def genBeepSequence(beepCentreTimesSecs, idealBeepDurationSecs,
sequenceDurationSecs, sampleRateHz, toneHz, amplitude):
"""\
Generates the audio sample values needed to create audio data containing beeps corresponding to the timings specified.
:param beepCentreTimeSecs: A list or iterable of the centre times of each beep (in seconds since the beginning of the sequence)
:param idealBeepDurationSecs: ideal duration of a beep in seconds
:param sequenceDurationSecs: total sequence duration in seconds
:param sampleRateHz: The final output sample rate in Hz
:param toneHz: The tone frequence in Hz for the beeps
:param amplitude: The peak amplitude for the beeps
:returns: An iterable that generates the sample values starting with the first sample value
"""
beepDurationSamples = calcNearestDurationForExactNumberOfCycles(
idealBeepDurationSecs, toneHz)
beepStartEndSamples = genSequenceStartEnds(beepCentreTimesSecs,
beepDurationSamples, 1.0,
sampleRateHz)
nSamples = sequenceDurationSecs * sampleRateHz
def toneGenFactory():
return GenTone(sampleRateHz, amplitude, toneHz, 0.0)
def silenceGen():
while True:
yield 0.0
seqIter = genSequenceFromSampleIndices(beepStartEndSamples, silenceGen,
toneGenFactory)
return itertools.islice(seqIter, 0, nSamples)
def genFlashSequence(flashCentreTimesSecs,
idealFlashDurationSecs,
sequenceDurationSecs,
frameRate,
gapValue=(0, 0, 0),
flashValue=(1.0, 1.0, 1.0)):
"""\
Generates the pixel colour values needed for each frame to render flashes corresponding to the timings specified.
:param beepCentreTimeSecs: A list or iterable of the centre times of each beep (in seconds since the beginning of the sequence)
:param idealFlashDurationSecs: ideal duration of a flash in seconds
:param sequenceDurationSecs: total sequence duration in seconds
:param sampleRateHz: The final output sample rate in Hz
:param gapValue: The value for non flash pixels
:param flashValue: The value for flash pixels
:returns: An iterable that generates the pixel colours for each frame starting with the first frame
"""
flashDurationSamples = calcNearestDurationForExactNumberOfCycles(
idealFlashDurationSecs, frameRate)
flashStartEndSamples = genSequenceStartEnds(flashCentreTimesSecs,
flashDurationSamples, 1.0,
frameRate)
nSamples = sequenceDurationSecs * frameRate
def gapGen():
while True:
yield gapValue
def flashGen():
while True:
yield flashValue
seqIter = genSequenceFromSampleIndices(flashStartEndSamples, gapGen,
flashGen)
return itertools.islice(seqIter, 0, nSamples)
def test_simple(self):
self.assertEquals(1, calcNearestDurationForExactNumberOfCycles(1.0, 500))
self.assertEquals(2.0/3.0, calcNearestDurationForExactNumberOfCycles(0.5, 3))
self.assertEquals(0.0335, calcNearestDurationForExactNumberOfCycles(1.0/30, 2000))
