Saad Tayyab / WDplayer

Plays 8-bit Mono Wav Files for PWM

WDplayer.cpp@0:c2f3d752d98f, 2019-03-25 (annotated)

Committer:
rottenegg
Date:
Mon Mar 25 10:27:56 2019 +0000
Revision:
0:c2f3d752d98f
Child:
3:574fdfeb949e
Added Documentation Comments;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rottenegg 0:c2f3d752d98f 1 #include "WDplayer.h"
rottenegg 0:c2f3d752d98f 2
rottenegg 0:c2f3d752d98f 3 PwmOut dac(PTC10);
rottenegg 0:c2f3d752d98f 4 unsigned char *buffer = (unsigned char *)malloc(1);
rottenegg 0:c2f3d752d98f 5
rottenegg 0:c2f3d752d98f 6 void WDplayer::intWD(const char *path) {
rottenegg 0:c2f3d752d98f 7 //open File
rottenegg 0:c2f3d752d98f 8 _fptr = fopen(path,"r");
rottenegg 0:c2f3d752d98f 9 if (_fptr == NULL) {
rottenegg 0:c2f3d752d98f 10 std::cerr << "Error File not Found" << std::endl;
rottenegg 0:c2f3d752d98f 11 }
rottenegg 0:c2f3d752d98f 12 //get info
rottenegg 0:c2f3d752d98f 13 unsigned int samplerate;
rottenegg 0:c2f3d752d98f 14 fseek(_fptr,24,SEEK_SET);
rottenegg 0:c2f3d752d98f 15 fread(&samplerate,4,1,_fptr);
rottenegg 0:c2f3d752d98f 16 fseek(_fptr,0,SEEK_END);
rottenegg 0:c2f3d752d98f 17 unsigned int len = ftell(_fptr);
rottenegg 0:c2f3d752d98f 18 _pwmfreq = (1.0f / samplerate);
rottenegg 0:c2f3d752d98f 19 dac.period(_pwmfreq / (8.0f * 1.75f));//wave control and playback factor control
rottenegg 0:c2f3d752d98f 20 _path = path;
rottenegg 0:c2f3d752d98f 21 _length = len - 44;
rottenegg 0:c2f3d752d98f 22 _fptr = NULL;
rottenegg 0:c2f3d752d98f 23 _tck = 0;
rottenegg 0:c2f3d752d98f 24 };
rottenegg 0:c2f3d752d98f 25
rottenegg 0:c2f3d752d98f 26 void WDplayer::WDplay() {
rottenegg 0:c2f3d752d98f 27 _fptr = fopen(_path,"r");
rottenegg 0:c2f3d752d98f 28 fseek(_fptr,44,SEEK_SET);
rottenegg 0:c2f3d752d98f 29 //sampling loop _ source of main performance issues
rottenegg 0:c2f3d752d98f 30 for (_tck = _length; _tck > 1; _tck--) {
rottenegg 0:c2f3d752d98f 31 fread(buffer,1,1,_fptr);
rottenegg 0:c2f3d752d98f 32 dac.write((int)buffer[0] / 255.00);
rottenegg 0:c2f3d752d98f 33 wait(_pwmfreq / 1.75f); //I dont like this & Playback present here
rottenegg 0:c2f3d752d98f 34 }
rottenegg 0:c2f3d752d98f 35 _fptr = NULL;
rottenegg 0:c2f3d752d98f 36 _tck = 0;
rottenegg 0:c2f3d752d98f 37 };
rottenegg 0:c2f3d752d98f 38
rottenegg 0:c2f3d752d98f 39 void WDplayer::WDtck() {
rottenegg 0:c2f3d752d98f 40 if (_fptr == NULL) {
rottenegg 0:c2f3d752d98f 41 _fptr = fopen(_path,"r");
rottenegg 0:c2f3d752d98f 42 fseek(_fptr,44,SEEK_SET);
rottenegg 0:c2f3d752d98f 43 }
rottenegg 0:c2f3d752d98f 44 //sampling loop
rottenegg 0:c2f3d752d98f 45 if (_tck == _length) {
rottenegg 0:c2f3d752d98f 46 _fptr = NULL;
rottenegg 0:c2f3d752d98f 47 _tck = 0;
rottenegg 0:c2f3d752d98f 48 } else {
rottenegg 0:c2f3d752d98f 49 fread(buffer,1,1,_fptr);
rottenegg 0:c2f3d752d98f 50 dac.write( (int)buffer[0] / 255.00 );
rottenegg 0:c2f3d752d98f 51 wait(_pwmfreq / 1.75f); //I dont like this remove to tick mode
rottenegg 0:c2f3d752d98f 52
rottenegg 0:c2f3d752d98f 53 }
rottenegg 0:c2f3d752d98f 54 };
rottenegg 0:c2f3d752d98f 55
rottenegg 0:c2f3d752d98f 56 unsigned long WDplayer::get_pwmfreq() {
rottenegg 0:c2f3d752d98f 57 return _pwmfreq;
rottenegg 0:c2f3d752d98f 58 };