wavplayer.h

00001 /*
00002  Library wave file player by Tom Coxon
00003 
00004  Based on WAVEplayer by Vlad Cazan/Stephan Rochon modified by Tom Coxon to:
00005 
00006  1. Run correctly on the Embedded Artists LPCXpresso baseboard.
00007  2. To play 8 bit sample size in addition to original 16 bit
00008  3. To be more fault tolerant when playing wav files.
00009 */
00010 
00011 #ifndef WAVPLAYER_H
00012 #define WAVPLAYER_H
00013 
00014 #include "mbed.h"
00015 
00016 #define SAMPLE_FREQ 40000
00017 #define BUF_SIZE (SAMPLE_FREQ/10)
00018 #define SLICE_BUF_SIZE 1
00019 
00020 typedef struct uFMT_STRUCT {
00021     short comp_code;
00022     short num_channels;
00023     unsigned sample_rate;
00024     unsigned avg_Bps;
00025     short block_align;
00026     short sig_bps;
00027 } FMT_STRUCT;
00028 
00029 class WavPlayer {
00030 
00031 public:
00032 
00033     void play_wave(char *wavname);
00034 
00035 private:
00036 
00037     void cleanup(char *);
00038     void fill_adc_buf(short *, unsigned);
00039     void swapword(unsigned *);
00040 
00041 // a FIFO for the DAC
00042     short DAC_fifo[256];
00043     short DAC_wptr;
00044     short DAC_rptr;
00045     short DAC_on;
00046 
00047     void dac_out();
00048 
00049 };
00050 
00051 #endif