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(8.D.2.5) WaveLoopPlayerFlashFract32

Overview

Periodic WAV playback supporting pitch shifting

Discussion

This module outputs wave data in fract32 fixed-point format in loop mode. It extracts wave data from AWE Flash File System container on the target Flash device, 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.

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.

On windows (Native PC) or Linux platforms, file operations are used and make sure the file path exists in the Audio Weaver file search path. If not, please update the file serch path from File->Set File Search Path... in the Designer. Maximum absolute file path should not be more than 512 charecters.

Type Definition

typedef struct _ModuleWaveLoopPlayerFlashFract32 {     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     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 maxWaveChannels;                        // Maximum number of channels a wave file can have     INT32 waveLength;                             // Number of samples in currently loaded file     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     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.     INT32 decFactor;                              // Internal derived variable to hold decimated smoothing blocks     INT32 waveBuffer;                             // State variable holds the start ofset of the wave file in flash file system.     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     void * localWaveBuffer;                       // Internal pointer used only on Windows or Linux, which holds entire wave data } ModuleWaveLoopPlayerFlashFract32Class;

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

 

normRate

float

const

0

1

Unrestricted

 

maxRate

float

const

0

2

Unrestricted

 

NCOFracBits

int

const

0

12

Unrestricted

 

maxWaveChannels

int

const

0

10

Unrestricted

 

waveLength

int

derived

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

 

NCOIntBits

int

derived

1

20

Unrestricted

 

formatF

float

derived

1

0

Unrestricted

 

formatI

float

derived

1

0

Unrestricted

 

decFactor

int

derived

1

1

Unrestricted

 

waveBuffer

int

state

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

 

localWaveBuffer

void *

state

1

 

Unrestricted

 

Pins

Input Pins

                Name: enable

         Description: Flag to enable playback

           Data type: int

       Channel range: 1

    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

Scratch Pins

       Channel count: 10

          Block size: 261

         Sample rate: 48000

MATLAB Usage

File Name: wave_loop_player_flash_fract32_module.m