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(8.D.1.2) WaveIndexPlayerFFS

Owned by Catherine Spain
Apr 10, 2023
5 min read

Overview

WAV playback using index vector as pitch factor input

Discussion

This module outputs wave data in loop mode and takes an input stream or vector as sample index input. 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. 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 channels 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 _ModuleWaveIndexPlayerFFS { ModuleInstanceDescriptor instance; // Common Audio Weaver module instance structure INT32 enable; // En/Disable playback INT32 interpMode; // Linear or cubic interpolation FLOAT32 normRate; // Rate of data used to compute the ratio for normalized players INT32 waveLength; // Number of samples in currently loaded file INT32 fsInstance; // AWE flash file system instance pointer 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 formatF; // Integer value of left-shift by NCOFracBits. Determines the precision of the linear interpolation. 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 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. } ModuleWaveIndexPlayerFFSClass;

Variables

Properties

Name

Type

Usage

isHidden

Default value

Range

Units

enable

int

state

0

1

0:1

 

interpMode

int

const

0

2

Unrestricted

 

normRate

float

const

0

1

Unrestricted

 

waveLength

int

derived

0

0

Unrestricted

 

fsInstance

int

state

0

0

Unrestricted

 

errorCode

int

state

0

0

Unrestricted

 

isReady

int

state

0

0

Unrestricted

 

waitForMuteDone

int

state

0

0

Unrestricted

 

formatF

float

const

1

65540

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

 

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

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: index

Description: sample index vector input data

Data type: float

Channel range: 1

Block size range: Unrestricted

Sample rate range: Unrestricted

Complex support: Real

Output Pins

Name: audio

Description: output data

Data type: float

 

Name: isPlaying

Description: playing state

Data type: int

Scratch Pins

Channel count: 1

Block size: 256

Sample rate: 48000

MATLAB Usage

File Name: wave_index_player_ffs_module.m