(8.D.2.1) WAVInterp16OneShotSourceFract32
- Catherine Spain
Overview
Periodic one shot WAV playback with linear interpolation
Type Definition
typedef struct _ModuleWAVInterp16OneShotSourceFract32
{
ModuleInstanceDescriptor instance; // Common Audio Weaver module instance structure
FLOAT32 smoothingTime; // Time constant of the smoothing process
INT32 circularBufferSize; // Size of the upstream circular buffer, in 16-bit words.
INT32 extensionSize; // Size of the extension region of the circular buffer, in 16-bit words
FLOAT32 currentFRatio; // Specifies rate at which audio is read from the input buffer
FLOAT32 smoothingCoeff; // Smoothing coefficient
INT32 fIndex; // 32-bit fractional state index
INT32 psObjectID; // Object ID of the upstream PeriodicStreaming module
ModuleInstanceDescriptor ** psObjectPtr; // Points to the upstream PeriodicStreaming module
} ModuleWAVInterp16OneShotSourceFract32Class;Variables
Properties
Name | Type | Usage | isHidden | Default value | Range | Units |
smoothingTime | float | parameter | 0 | 10 | 0:1000 | msec |
circularBufferSize | int | const | 0 | 0 | Unrestricted | Â |
extensionSize | int | parameter | 0 | 0 | Unrestricted | Â |
currentFRatio | float | parameter | 1 | 1 | Unrestricted | Â |
smoothingCoeff | float | derived | 1 | 0.03278 | Unrestricted | Â |
fIndex | int | state | 1 | 0 | Unrestricted | Â |
psObjectID | int | state | 1 | -1 | Unrestricted | Â |
psObjectPtr | ModuleInstanceDescriptor ** | state | 1 | Â | Unrestricted | Â |
Pins
Input Pins
Name: ptr
Description: Pointer to the streaming transfer object
Data type: int
Channel range: 1
Block size range: 1
Sample rate range: Unrestricted
Complex support: Real
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Name: trigger
Description: Boolean trigger signal
Data type: int
Channel range: 1
Block size range: 1
Sample rate range: Unrestricted
Complex support: Real
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Name: fRatio
Description: Specifies sample rate ratio
Data type: float
Channel range: 1
Block size range: 1
Sample rate range: Unrestricted
Complex support: Real
Output Pins
Name: out
Description: output data
Data type: fract32
MATLAB Usage
File Name: wav_interp16_oneshot_source_fract32_module.m
M=wav_interp16_oneshot_source_fract32_module(NAME, NUMCHANNELS, BLOCKSIZE, SAMPLERATE)
Creates a source module that connects to a streaming buffer module and outputs blocks
of data. The function includes linear interpolation allowing playback to be slowed down and
speeded up. This version uses 16-bit WAV data and a 32-bit fIndex register for efficient
implementation. This version is a "one shot player" in which the playback is triggered
by an input pin and then stops after the WAV data has been played once. Arguments:
NAME - name of the module.
NUMCHANNELS - number of interleaved channels in each output pin.
By default, NUMCHANNELS = 1;
BLOCKSIZE - number of samples per output channel. By default,
BLOCKSIZE = 32.
SAMPLERATE - sample rate of the output signal, in Hz. By default,
SAMPLERATE = 48000.Â