Andreas Grün / Mbed 2 deprecated madplayer

MP3 Player without external hardware MP3 Player without external hardware. A software based MP3 player based on a modified version of libmad. Mono output (at the moment) via AnalogOut. Files are read from an USB drive. This is a demo program, it plays only one file at the moment. Documentation is in "main.cpp" and "config.h"

Dependencies:   mbed

lpc1768_mem.cpp@2:f28cf0afd021, 2010-11-27 (annotated)

Committer:
Gruenfrosch
Date:
Sat Nov 27 17:27:33 2010 +0000
Revision:
2:f28cf0afd021
Version 3:

 * moved another memory block into AHB RAM, giving more room for

 * stereo buffer.

 * moved content of decode() to main()

 * decoding	is now safe to be called multiple times (bug in older versions)

 * Output routine now fills stereo buffer, DAC output sums channels,

 * just for demonstration that stereo output could go here

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Gruenfrosch 2:f28cf0afd021 1 #include "mbed.h"
Gruenfrosch 2:f28cf0afd021 2 #include "config.h"
Gruenfrosch 2:f28cf0afd021 3
Gruenfrosch 2:f28cf0afd021 4 static char *free_ptr = (char *)AHBMEM;
Gruenfrosch 2:f28cf0afd021 5 static int free_sz = AHBMEMSIZE;
Gruenfrosch 2:f28cf0afd021 6 void reset_ahb_mem(void)
Gruenfrosch 2:f28cf0afd021 7 {
Gruenfrosch 2:f28cf0afd021 8 free_ptr = (char *)AHBMEM;
Gruenfrosch 2:f28cf0afd021 9 free_sz = AHBMEMSIZE;
Gruenfrosch 2:f28cf0afd021 10 }
Gruenfrosch 2:f28cf0afd021 11 void *mad_malloc(unsigned int sz)
Gruenfrosch 2:f28cf0afd021 12 {
Gruenfrosch 2:f28cf0afd021 13 unsigned int nsz = ((sz >> 3) + 1) << 3; // align to 8 byte
Gruenfrosch 2:f28cf0afd021 14 if(nsz < free_sz)
Gruenfrosch 2:f28cf0afd021 15 {
Gruenfrosch 2:f28cf0afd021 16 char *p = free_ptr;
Gruenfrosch 2:f28cf0afd021 17 free_ptr += nsz;
Gruenfrosch 2:f28cf0afd021 18 free_sz -=nsz;
Gruenfrosch 2:f28cf0afd021 19 return(p);
Gruenfrosch 2:f28cf0afd021 20 }
Gruenfrosch 2:f28cf0afd021 21 else
Gruenfrosch 2:f28cf0afd021 22 {
Gruenfrosch 2:f28cf0afd021 23 return(malloc(sz));
Gruenfrosch 2:f28cf0afd021 24 }
Gruenfrosch 2:f28cf0afd021 25 }