bryan wade / Mbed 2 deprecated usb_sound_effects

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

/media/uploads/bw/img_1293.jpg 

/* 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@2:9429f84ea165, 2014-03-27 (annotated)

Committer:
bw
Date:
Thu Mar 27 21:43:41 2014 +0000
Revision:
2:9429f84ea165
Parent:
0:bbf6cf0eab95 
Clean up comments.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bw 0:bbf6cf0eab95 1 /*******************************************************************************
bw 0:bbf6cf0eab95 2 * Implements FIFO buffer for glitch-free audio playback.
bw 0:bbf6cf0eab95 3 * Bryan Wade
bw 0:bbf6cf0eab95 4 * 27 MAR 2014
bw 0:bbf6cf0eab95 5 ******************************************************************************/
bw 0:bbf6cf0eab95 6 #ifndef BUFFER_H
bw 0:bbf6cf0eab95 7 #define BUFFER_H
bw 0:bbf6cf0eab95 8
bw 0:bbf6cf0eab95 9 #include <stdint.h>
bw 0:bbf6cf0eab95 10 #include <stdlib.h>
bw 0:bbf6cf0eab95 11
bw 0:bbf6cf0eab95 12 typedef struct buffer_t buffer_t; // Opaque type declaration.
bw 0:bbf6cf0eab95 13
bw 0:bbf6cf0eab95 14 // Get a ptr to a new buffer.
bw 0:bbf6cf0eab95 15 buffer_t *Buffer_Create(void *ram, size_t size);
bw 0:bbf6cf0eab95 16
bw 0:bbf6cf0eab95 17 // Read one sample from buffer.
bw 0:bbf6cf0eab95 18 bool Buffer_Read(buffer_t *buffer, int16_t *pDataOut);
bw 0:bbf6cf0eab95 19
bw 0:bbf6cf0eab95 20 // Write one sample to buffer.
bw 0:bbf6cf0eab95 21 void Buffer_Write(buffer_t *buffer, int16_t DataIn);
bw 0:bbf6cf0eab95 22
bw 0:bbf6cf0eab95 23 // Write a block of data to buffer.
bw 0:bbf6cf0eab95 24 void Buffer_WriteBlock(buffer_t *buffer, const int16_t *pDataIn, uint32_t length);
bw 0:bbf6cf0eab95 25
bw 0:bbf6cf0eab95 26 // Get the current number of samples buffered.
bw 0:bbf6cf0eab95 27 int32_t Buffer_GetLevel(buffer_t *buffer);
bw 0:bbf6cf0eab95 28
bw 0:bbf6cf0eab95 29 #endif