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. */
buffer.h
- Committer:
- bw
- Date:
- 2014-03-27
- Revision:
- 2:9429f84ea165
- Parent:
- 0:bbf6cf0eab95
File content as of revision 2:9429f84ea165:
/******************************************************************************* * 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