Overview
One-shot Wave Player supporting pitch shifting
Discussion
This module outputs wave data triggered via an input pin. It extracts wave data from AWE Flash File System container on control input pin fsInstance, based on WAVFILE argument. User has to specify the file name as an argument and can also change file name directly into fileName array as 32-bit packed data during run time. The input .trigger is a Boolean value which if set starts playback. Playback continues until the end of the file is reached and then it stops. Retrigger while being in the middle of the playback has no effect and will be ignored. The module supports multichannel such that, if the wave file has more channels than provided to the module argument then only channels up to output pin will be used. If the wave file has less channels than output pin channels, then the remaining output channels will be muted.
Optional argument MUTMOD can be used to mute output before changing file in run time.
Optional argument UNMUTEMOD can be used to un-mute output after file is processed in run time.
If any errors occurs in the module, it is captured in the parameter .errorCodes. Please check in Errors.h for the meaning of error code returned.
Type Definition
typedef struct _ModuleWaveOneShotPlayerFFSFract32 { ModuleInstanceDescriptor instance; // Common Audio Weaver module instance structure INT32 smoothingTime; // Time constant of the pitch smoothing process INT32 smoothingFactor; // Update rate for smoothing coeffs (per block) FLOAT32 normRate; // Rate of data used to compute the ratio for normalized players FLOAT32 maxRate; // Highest allowed rate of playback that can be specified INT32 NCOFracBits; // Number of least-significant bits for the *fractional* part of the NCO word (word size: 32) INT32 waveLength; // Number of samples in currently loaded file INT32 fsInstance; // AWE flash file system instance pointer INT32 fIndex; // Current index in the wave file FLOAT32 fIndexFract; // Current fract index in the wave file INT32 errorCode; // Captures errors that could arise in the module C code. Appears on the inspector INT32 isReady; // Boolean that indicates the module is not ready to output data INT32 waitForMuteDone; // Internal flag to check if the smooth mute is done FLOAT32 currentFStep; // Current (smoothed) rate at which audio is read from the input buffer INT32 triggerPrev; // State trigger signal to determine falling edge INT32 triggerLatched; // State trigger denoting player is active INT32 waveSR; // Actual sample rate of the wave file. INT32 waveNumChannels; // Number of channels in the wave file. INT32 waveBit; // Wave data sample bit resolution. FLOAT32 scaleFactor; // Scale factor for playback rate FLOAT32 smoothingCoeff; // Smoothing (pitch) coefficient INT32 NCOIntBits; // Number of most-significant bits for the *integer* part of the NCO word (word size: 32). By default: 20 bits FLOAT32 formatF; // Integer value of left-shift by NCOFracBits. Determines the precision of the linear interpolation. FLOAT32 formatI; // Integer value of left-shift by NCOIntBits. Determines the maximum playback rate and the maximum size of a wave file in samples. UINT32 pinID; // Specifies which control pins are available. INT32* fileName; // Name of wave file to playback INT32* fileNamePrev; // Name of wave file to playback void * muteModPtr; // Internal pointer to mute module to mute before reconfiguration void * unMuteModPtr; // Internal pointer to mute module to unmute after reconfiguration UINT32 * fsInstancePtr; // AWE flash file system instance pointer UINT32 * waveBuffer; // State variable holds the start address of the wave file in filesystem. } ModuleWaveOneShotPlayerFFSFract32Class;
Variables
Properties
Name | Type | Usage | isHidden | Default value | Range | Units |
smoothingTime | int | parameter | 0 | 10 | 0:1000 | msec |
smoothingFactor | int | parameter | 0 | 4 | 1:512 | |
normRate | float | const | 0 | 1 | Unrestricted | |
maxRate | float | const | 0 | 2 | Unrestricted | |
NCOFracBits | int | const | 0 | 12 | Unrestricted | |
waveLength | int | derived | 0 | 0 | Unrestricted | |
fsInstance | int | state | 0 | 0 | Unrestricted | |
fIndex | int | state | 0 | 0 | Unrestricted | |
fIndexFract | float | state | 0 | 0 | Unrestricted | |
errorCode | int | state | 0 | 0 | Unrestricted | |
isReady | int | state | 0 | 0 | Unrestricted | |
waitForMuteDone | int | state | 0 | 0 | Unrestricted | |
currentFStep | float | state | 0 | 1 | Unrestricted | |
triggerPrev | int | state | 0 | 0 | Unrestricted | |
triggerLatched | int | state | 0 | 0 | Unrestricted | |
waveSR | int | derived | 1 | 0 | Unrestricted | |
waveNumChannels | int | derived | 1 | 0 | Unrestricted | |
waveBit | int | derived | 1 | 0 | Unrestricted | |
scaleFactor | float | derived | 1 | 1 | Unrestricted | |
smoothingCoeff | float | derived | 1 | 0 | Unrestricted | |
NCOIntBits | int | derived | 1 | 20 | Unrestricted | |
formatF | float | derived | 1 | 0 | Unrestricted | |
formatI | float | derived | 1 | 0 | Unrestricted | |
pinID | uint | const | 1 | 1 | Unrestricted | |
fileName | int* | parameter | 1 | [14 x 1] | Unrestricted | |
fileNamePrev | int* | state | 1 | [14 x 1] | Unrestricted | |
muteModPtr | void * | state | 1 | 0 | Unrestricted | |
unMuteModPtr | void * | state | 1 | 0 | Unrestricted | |
fsInstancePtr | UINT32 * | state | 1 | Unrestricted | ||
waveBuffer | UINT32 * | state | 1 | Unrestricted |
Pins
Input Pins
Name: trigger
Description: Boolean trigger signal
Data type: int
Channel range: 1
Block size range: 1
Sample rate range: Unrestricted
Complex support: Real
Name: fsInstance
Description: AWE file system instance pointer
Data type: int
Channel range: Unrestricted
Block size range: 1
Sample rate range: Unrestricted
Complex support: Real
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: audio
Description: output data
Data type: fract32
Name: isPlaying
Description: playing state
Data type: int
MATLAB Usage
File Name: wave_oneshot_player_ffs_fract32_module.m