Difference between revisions of "CSC111 Lab 5 Solutions 2014"
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--[[User:Thiebaut|D. Thiebaut]] ([[User talk:Thiebaut|talk]]) 21:37, 25 February 2014 (EST) | --[[User:Thiebaut|D. Thiebaut]] ([[User talk:Thiebaut|talk]]) 21:37, 25 February 2014 (EST) | ||
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=Solution Programs for Lab #5= | =Solution Programs for Lab #5= | ||
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<source lang="python"> | <source lang="python"> | ||
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""" | """ | ||
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# JES Program | # JES Program | ||
# JES program to take a sound file and play with it | # JES program to take a sound file and play with it | ||
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blockingPlay( sound ) | blockingPlay( sound ) | ||
| + | # ======================================================= | ||
| + | # clear waveform after "Remember" | ||
# get start index for clearing | # get start index for clearing | ||
startIndex = 13393 # index just before "the force..." | startIndex = 13393 # index just before "the force..." | ||
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#blockingPlay( sound ) | #blockingPlay( sound ) | ||
| + | # ======================================================= | ||
# Copy "remember" to the end of itself in the waveform | # Copy "remember" to the end of itself in the waveform | ||
rememberLength = startIndex # that's the length of the word "remember" | rememberLength = startIndex # that's the length of the word "remember" | ||
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# get the original sound again | # get the original sound again | ||
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sound = makeSound( file ) | sound = makeSound( file ) | ||
blockingPlay( sound ) | blockingPlay( sound ) | ||
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| + | # ======================================================= | ||
| + | # copy Always right after Remember | ||
| + | startAlways = 30444 # index just before "Always" | ||
| + | endRemember = 8968 | ||
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| + | # set j to the end of Remember | ||
| + | j = endRemember | ||
| + | for i in range( startAlways, noSamples ): | ||
| + | # copy from Always | ||
| + | value = getSampleValueAt( sound, i ) | ||
| + | # into waveform after Remember | ||
| + | setSampleValueAt( sound, j, value ) | ||
| + | # advance j by 1 | ||
| + | j = j+1 | ||
| + | |||
| + | # now j points to the end of the moved "Always" | ||
| + | endRememberAlways = j | ||
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| + | # clear from the end of RememberAlways to the end of the waveform | ||
| + | for i in range( endRememberAlways, noSamples ): | ||
| + | setSampleValueAt( sound, i, 0 ) | ||
| + | |||
| + | blockingPlay( sound ) | ||
| + | |||
| + | """ | ||
| + | # ======================================================= | ||
| + | # create an echo | ||
startIndex = 13393 # index just before "the force..." | startIndex = 13393 # index just before "the force..." | ||
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sourceValue = getSampleValueAt( sound, i) | sourceValue = getSampleValueAt( sound, i) | ||
destValue = getSampleValueAt( sound, i+offset ) | destValue = getSampleValueAt( sound, i+offset ) | ||
| − | setSampleValueAt( sound, i+offset, sourceValue + destValue ) | + | setSampleValueAt( sound, i+offset, sourceValue//3 + destValue ) |
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| + | blockingPlay( sound ) | ||
| + | """ | ||
| + | |||
| + | # ======================================================= | ||
| + | # reverse the whole waveform | ||
| + | file = pickAFile() | ||
| + | sound = makeSound( file ) | ||
| + | blockingPlay( sound ) | ||
| + | |||
| + | # make j the index of the last sample in the sound | ||
| + | j = getLength(sound)-1 | ||
| + | # make i go from beginning of sound to half way. | ||
| + | for i in range( getLength( sound ) // 2 ): | ||
| + | # get the two samples at Index i and at Index j | ||
| + | valueAti = getSampleValueAt( sound, i ) | ||
| + | valueAtj = getSampleValueAt( sound, j ) | ||
| + | |||
| + | # swap them | ||
| + | temp = valueAti | ||
| + | valueAti = valueAtj | ||
| + | valueAtj = temp | ||
| + | |||
| + | # put the swapped versions back in sound | ||
| + | setSampleValueAt( sound, i, valueAti ) | ||
| + | setSampleValueAt( sound, j, valueAtj ) | ||
| + | |||
| + | # move j to the left by 1. The for loop moves i to the right | ||
| + | j = j-1 | ||
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blockingPlay( sound ) | blockingPlay( sound ) | ||
</source> | </source> | ||
| − | + | </onlydft> | |
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<br /> | <br /> | ||
<br /> | <br /> | ||
