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Dependencies:   mbed FATFileSystem

WDplayer/WDplayer.cpp@2:964e19f2f3f1, 2019-04-18 (annotated)

Committer:
rottenegg
Date:
Thu Apr 18 19:47:30 2019 +0000
Revision:
2:964e19f2f3f1
Child:
3:63cdd5cab431
Documented the N5110-Modded and added the WDplayer, a Library that plays 8-Bit Mono-stereo .wav files - However, it has problems running alongside as a Ticker event.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rottenegg 2:964e19f2f3f1 1 #include "WDplayer.h"
rottenegg 2:964e19f2f3f1 2
rottenegg 2:964e19f2f3f1 3 unsigned char *buffer = (unsigned char *)malloc(1);
rottenegg 2:964e19f2f3f1 4
rottenegg 2:964e19f2f3f1 5 void WDplayer::intWD(const char *path) {
rottenegg 2:964e19f2f3f1 6 //open File
rottenegg 2:964e19f2f3f1 7 _fptr = fopen(path,"r");
rottenegg 2:964e19f2f3f1 8 if (_fptr == NULL) {
rottenegg 2:964e19f2f3f1 9 std::cerr << "Error File not Found" << std::endl;
rottenegg 2:964e19f2f3f1 10 }
rottenegg 2:964e19f2f3f1 11 //get info
rottenegg 2:964e19f2f3f1 12 unsigned int samplerate;
rottenegg 2:964e19f2f3f1 13 fseek(_fptr,24,SEEK_SET);
rottenegg 2:964e19f2f3f1 14 fread(&samplerate,4,1,_fptr);
rottenegg 2:964e19f2f3f1 15 fseek(_fptr,0,SEEK_END);
rottenegg 2:964e19f2f3f1 16 unsigned int len = ftell(_fptr);
rottenegg 2:964e19f2f3f1 17 _pwmfreq = (1.0f / samplerate);
rottenegg 2:964e19f2f3f1 18 _path = path;
rottenegg 2:964e19f2f3f1 19 _length = len - 44;
rottenegg 2:964e19f2f3f1 20 _fptr = NULL;
rottenegg 2:964e19f2f3f1 21 _tck = 0;
rottenegg 2:964e19f2f3f1 22 };
rottenegg 2:964e19f2f3f1 23
rottenegg 2:964e19f2f3f1 24 void WDplayer::WDplay(PwmOut &dac) {
rottenegg 2:964e19f2f3f1 25 _fptr = fopen(_path,"r");
rottenegg 2:964e19f2f3f1 26 fseek(_fptr,44,SEEK_SET);
rottenegg 2:964e19f2f3f1 27 //sampling loop _ source of main performance issues
rottenegg 2:964e19f2f3f1 28 for (_tck = _length; _tck > 1; _tck--) {
rottenegg 2:964e19f2f3f1 29 fread(buffer,1,1,_fptr);
rottenegg 2:964e19f2f3f1 30 dac.write((float)buffer[0] / 255.00f);
rottenegg 2:964e19f2f3f1 31 wait(_pwmfreq / 2.0f); //I dont like this & Playback present here
rottenegg 2:964e19f2f3f1 32 }
rottenegg 2:964e19f2f3f1 33 _fptr = NULL;
rottenegg 2:964e19f2f3f1 34 _tck = 0;
rottenegg 2:964e19f2f3f1 35 };
rottenegg 2:964e19f2f3f1 36
rottenegg 2:964e19f2f3f1 37 void WDplayer::WDtck(PwmOut &dac) {
rottenegg 2:964e19f2f3f1 38 if (_fptr == NULL) {
rottenegg 2:964e19f2f3f1 39 _fptr = fopen(_path,"r");
rottenegg 2:964e19f2f3f1 40 fseek(_fptr,44,SEEK_SET);
rottenegg 2:964e19f2f3f1 41 }
rottenegg 2:964e19f2f3f1 42 //sampling loop
rottenegg 2:964e19f2f3f1 43 if (_tck == _length) {
rottenegg 2:964e19f2f3f1 44 _fptr = NULL;
rottenegg 2:964e19f2f3f1 45 _tck = 0;
rottenegg 2:964e19f2f3f1 46 } else {
rottenegg 2:964e19f2f3f1 47 fread(buffer,1,1,_fptr);
rottenegg 2:964e19f2f3f1 48 dac.write( (int)buffer[0] / 255.00 );
rottenegg 2:964e19f2f3f1 49 //wait(_pwmfreq / 2.0f); //I dont like this remove to tick mode
rottenegg 2:964e19f2f3f1 50 _tck++;
rottenegg 2:964e19f2f3f1 51 }
rottenegg 2:964e19f2f3f1 52 };
rottenegg 2:964e19f2f3f1 53
rottenegg 2:964e19f2f3f1 54 float WDplayer::get_pwmfreq() {
rottenegg 2:964e19f2f3f1 55 return _pwmfreq;
rottenegg 2:964e19f2f3f1 56 };