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. User has to specify the file name as an argument. 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.

Type Definition

typedef struct _ModuleWaveIndexPlayerRAM
{
    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
    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.
    FLOAT32 scaleFactor;                          // Scale factor for playback rate
    UINT32 pinID;                                 // Specifies which control pins are available.
    INT32* waveBuffer;                            // Data transferred from PC to target DSP via this buffer.
} ModuleWaveIndexPlayerRAMClass;

Variables

Properties

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: 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_ram_module.m