wave~

Variable size wavetable

Description

wave~ reads from a portion of a buffer~ to produce a repeating waveform, given a signal input that goes between 0 and 1 (for example, using a phasor~) to define the position in the buffer. When the wave~ object is instantiated as mcs.wave~ its outputs are combined into a single multichannel output but otherwise it functions identically to wave~.

Examples

Loop through part of a sample, treating it as a variable-size wavetable

Arguments

buffer-name [symbol]

Obligatory. Names the buffer~ object whose sample memory is used by wave~ for its stored waveform. Note that if the underlying data in a buffer~ changes, the signal output of wave~ will change, since it does not copy the sample data in a buffer~. wave~ always uses the first channel of a multi-channel buffer~.

start-point [number]

Optional
Unitsms

After the buffer~ name argument, you can type in a value for the start and end points of the waveform as millisecond offset from the beginning of a buffer~ object's sample memory. By default, the start point is 0. If you want to set a non-zero start point but retain the sample end as the waveform end point, use only a single typed-in argument after the buffer~ name. The wave~ object uses the buffer~ sampling rate to determine loop points. If a signal is connected to the start point (middle) inlet, the initial waveform start point argument is ignored.

end-point [number]

Optional
Unitsms

After the start point argument, you can type in a value for the end point of the waveform, as a millisecond offsets from the beginning of a buffer~ object's sample memory. By default, the end point is the end of the sample. If a signal is connected to the end point (right) inlet, the initial waveform end point is ignored.

number-of-output-channels [int]

Optional

Sets the number of output channels, which determines the number of outlets that the wave~ object will have. If the buffer~ object being played by wave~ has more channels than the number of outputs of wave~, the extra channels are not played. If the buffer~ object has fewer channels, the extra wave~ signal outputs are 0.

Attributes

interp [int]

The interpolation modes are:

Value- Description

0- No interpolation. Wavetable interpolation is disabled using the interp 0 message.
1- High-quality linear interpolation (default)
2- Low-quality linear interpolation. This mode uses the interpolation method found in MSP 1.x versions of the wave~ object. While this mode is faster than mode 1, it cannot play buffer~ objects of arbitrary length and produces more interpolation artifacts.
3- Cosine interpolation
4- Cubic interpolation
5- Spline interpolation
6- Hermite interpolation


Possible values:

0 = 'None' ( No interpotlation )
1 = 'Linear'
2 = 'Low-Quality'
3 = 'Cosine' ( Cosine interpolation )
4 = 'Cubic' ( Cubic interpolation )
5 = 'Spline' ( Spline interpolation )
6 = 'Hermite' ( Hermite interpolation )

interp_bias [float]

Set the bias parameter for Hermite interpolation

interp_tension [float]

Set the tension parameter for Hermite interpolation

Common Box Attributes

annotation [symbol]

Sets the text that will be displayed in the Clue window when the user moves the mouse over the object.

background [int] (default: 0)

Adds or removes the object from the patcher's background layer. background 1 adds the object to the background layer, background 0 removes it. Objects in the background layer are shown behind all objects in the default foreground layer.

color [4 floats]

Sets the color for the object box outline.

fontface [int]

Sets the type style used by the object. The options are:

plain
bold
italic
bold italic

Possible values:

0 = 'regular'
1 = 'bold'
2 = 'italic'
3 = 'bold italic'

fontname [symbol]

Sets the object's font.

fontsize [float]

Sets the object's font size (in points).

Possible values:

'8'
'9'
'10'
'11'
'12'
'13'
'14'
'16'
'18'
'20'
'24'
'30'
'36'
'48'
'64'
'72'

hidden [int] (default: 0)

Toggles whether an object is hidden when the patcher is locked.

hint [symbol]

Sets the text that will be displayed in as a pop-up hint when the user moves the mouse over the object in a locked patcher.

ignoreclick [int] (default: 0)

Toggles whether an object ignores mouse clicks in a locked patcher.

patching_rect [4 floats] (default: 0. 0. 100. 0.)

Sets the position and size of the object in the patcher window.

position [2 floats]

g/s(set)

Sets the object's x and y position in both patching and presentation modes (if the object belongs to its patcher's presentation), leaving its size unchanged.

presentation [int] (default: 0)

Sets whether an object belongs to the patcher's presentation.

presentation_rect [4 floats] (default: 0. 0. 0. 0.)

Sets the x and y position and width and height of the object in the patcher's presentation, leaving its patching position unchanged.

rect [4 floats]

g/s(set)

Sets the x and y position and width and height of the object in both patching and presentation modes (if the object belongs to its patcher's presentation).

size [2 floats]

g/s(set)

Sets the object's width and height in both patching and presentation modes (if the object belongs to its patcher's presentation), leaving its position unchanged.

textcolor [float]

Sets the color for the object's text in RGBA format.

textjustification [int]

Sets the justification for the object's text.

Possible values:

0 = 'left'
1 = 'center'
2 = 'right'

varname [symbol]

Sets the patcher's scripting name, which can be used to address the object by name in pattr, scripting messages to thispatcher, and the js object.

Messages

int

Arguments

start/end-point [int]
In middle or right inlets: Numbers can be used instead of signal objects to control the start and end points of the waveform, provided a signal is not connected to the inlet that receives the number. The wave~ object uses the buffer~ sampling rate to determine loop points.

float

Arguments

start/end-point [float]
In middle or right inlets: Numbers can be used instead of signal objects to control the start and end points of the waveform, provided a signal is not connected to the inlet that receives the number. The wave~ object uses the buffer~ sampling rate to determine loop points.

(mouse)

Double-clicking on the wave~ object will open a window that displays the audio file loaded in the buffer associated with the object.

set

Arguments

buffer-name [symbol]
start-point (millisecond-offset) [float]
end-point (millisecond-offset) [float]
The word set, followed by a symbol, sets the buffer~ used by wave~ for its stored waveform. The symbol can optionally be followed by two values setting new waveform start and end points. If the values are not present, the default start and end points (the start and end of the sample) are used. If signal objects are connected to the start and/or end point inlets, the start and/or end point values are ignored.

signal

In left inlet: Input signal values progressing from 0 to 1 are used to scan a specified range of samples in a buffer~ object. The output of a phasor~ can be used to control wave~ as an oscillator, treating the range of samples in the buffer~ as a repeating waveform. However, note that when changing the frequency of a phasor~ connected to the left inlet of wave~, the perceived pitch of the signal coming out of wave~ may not correspond exactly to the frequency of phasor~ itself if the stored waveform contains multiple or partial repetitions of a waveform. You can invert the phasor~ to play the waveform backwards.

In middle inlet: The start of the waveform as a millisecond offset from the beginning of a buffer~ object's sample memory.

In right inlet: The end of the waveform as a millisecond offset from the beginning of a buffer~ object's sample memory.

Output

signal

The portion of the buffer~ specified by the wave~ object's start and end points is scanned by signal values ranging from 0 to 1 in the wave~ object's inlet, and the corresponding sample value from the buffer~ is sent out the wave~ object's outlet. If the signal received in wave's inlet is a repeating signal such as a sawtooth wave from a phasor~, the resulting output will be a waveform (excerpted from the buffer~) repeating at the frequency corresponding to the repetition of the input signal.

See Also

Name Description
2d.wave~ Two-dimensional wavetable
buffer~ Store audio samples
buffir~ buffer-based FIR filter
groove~ Variable-rate looping sample playback
phasor~ Generate sawtooth signals
play~ Position-based sample playback
sync~ Synchronize MSP with an external source
MSP Sampling Tutorial 4: Variable-length Wavetable MSP Sampling Tutorial 4: Variable-length Wavetable