Overview
Periodic WAV playback supporting pitch shifting
Discussion
This module outputs wave data in loop mode. 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. Along with the above parameters, the playback functionality can be enabled from the control input pin, 1 - Enable and 0 - Disable.
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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
Code Block |
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typedef struct _ModuleWaveLoopPlayerFFS { 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) INT32 startDelay; // Starting delay value in samples INT32 enable; // En/Disable playback. Resets sample position to startDelay value upon stop INT32 interpMode; // Linear or cubic interpolation 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 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 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 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. } ModuleWaveLoopPlayerFFSClass; |
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 | |
startDelay | int | parameter | 0 | 0 | Unrestricted | |
enable | int | state | 0 | 1 | 0:1 | |
interpMode | int | const | 0 | 2 | Unrestricted | |
normRate | float | const | 0 | 1 | Unrestricted | |
maxRate | float | const | 0 | 2 | 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 | |
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 | |
pinID | uint | const | 1 | 3 | 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: enable
Description: Flag to enable playback
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Sample rate range: Unrestricted
Complex support: Real
Output Pins
Name: audio
Description: output data
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Description: playing state
Data type: int
MATLAB Usage
File Name: wave_loop_player_ffs_module.m