bryan wade
Streams USB audio with sound effects applied. Sound effect selected by joystick and intensity altered by tilting the mbed. Output to the mbed-application-board phono jack.
Dependencies: C12832_lcd MMA7660 USBDevice mbed
/* Uses the mbed LPC1768 and mbed-application-board to create a USB audio device * that streams audio from a host computer to headphones or powered speakers. * A couple different sound effects can be applied to the stream in real-time, * and tilting the mbed alters intensity of the effect. * * ECHO * The joystick selects ) | * one of three effect ) STRAIGHT - o - STRAIGHT * modes. ) | * REVERB * * * * \\ || * Tilting the mbed ) ====== \\ || * determines intensity ) \\ || * of the effect. ) * 0% 50% 100% * * The LCD display shows the current effect mode, intesity and buffer level. */
Diff: buffer.h
- Revision:
- 0:bbf6cf0eab95
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/buffer.h Thu Mar 27 21:27:04 2014 +0000 @@ -0,0 +1,29 @@ +/******************************************************************************* + * Implements FIFO buffer for glitch-free audio playback. + * Bryan Wade + * 27 MAR 2014 + ******************************************************************************/ +#ifndef BUFFER_H +#define BUFFER_H + +#include <stdint.h> +#include <stdlib.h> + +typedef struct buffer_t buffer_t; // Opaque type declaration. + +// Get a ptr to a new buffer. +buffer_t *Buffer_Create(void *ram, size_t size); + +// Read one sample from buffer. +bool Buffer_Read(buffer_t *buffer, int16_t *pDataOut); + +// Write one sample to buffer. +void Buffer_Write(buffer_t *buffer, int16_t DataIn); + +// Write a block of data to buffer. +void Buffer_WriteBlock(buffer_t *buffer, const int16_t *pDataIn, uint32_t length); + +// Get the current number of samples buffered. +int32_t Buffer_GetLevel(buffer_t *buffer); + +#endif