Audio Player DLL

Submitted by mapleman on Fri, 2005-08-12 23:00

Well this project involves a lot of things that definitely are
entertaining. It started as a Audio Playing DLL. Vague? You bet.
Anyway, this DLL is nothing more than an MP3 player or was. I started
writing and got more excited everytime and eventually I decided to make
it compatible with XPCOM, and use it to play audio through mozilla.
I actually wrote that piece of code and its stashed somewhere!

Anyway, it was becoming more like a kludge than a library. So I decided
to rewrite it entirely. I separated the code a lot in order for it to become
sort of modular. Now you can actually play OGG's aswell. Can add any
other type of sound aslong as you rewrite the 5 routines required.

Here is how it currently works:

  1. #include "AudioDecoderEngine.h"
  2. #include "MP3Library.h"
  3. #include <windows.h>
  4. #include <stdio.h>
  5. #include <time.h>
  6. /* This callback only works on MP3s */
  7.  
  8. void callback(void * data, status ourStatus, void * user_data) {
  9.  
  10.     pfData ourData = (pfData)data;
  11.     pmp3data innerData = (pmp3data)ourData->extraFileData;
  12.  
  13.     static int calls = 0;
  14.  
  15.     if (calls++ < 1 && ourStatus != STATUS_CLOSING)
  16.  
  17.            fprintf(stdout, "Layer[%s] Mode[%s] Emphasis[%s]\n\r",
  18.              MP3Layer[innerData->layer],
  19.              MP3Mode[innerData->mode],
  20.              MP3Emphasis[innerData->emphasis]);
  21.  
  22.  
  23.     switch(ourStatus)
  24.      {        case STATUS_CLOSING:
  25.          break;
  26.  
  27.        case STATUS_OPENING:
  28.          break;
  29.        case STATUS_PLAYING:
  30.          fprintf(stdout,"%d%%\r",
  31.             (ourData->currentFrame*100) / ourData->totalFrames );
  32.  
  33.          break;
  34.        case STATUS_DONE:
  35.          fprintf(stdout, "done playing\n\r");
  36.  
  37.          calls = 0;
  38.          break;
  39.      }
  40. }
  41.  
  42. int main(int argc, char **argv)
  43. {
  44.  
  45.      PAudioLib audio =
  46.      AUDIO_INIT("D:\\Dream Theater - Another Day.mp3", NULL, callback)
  47.  
  48.      int i;
  49.      AUDIO_LOAD(audio)
  50.      AUDIO_PLAY(audio, 0)
  51.  
  52.      while(audio->playing)
  53.      {
  54.        Sleep(2000);
  55.  
  56.      }
  57.  
  58.      AUDIO_STOP(audio)
  59.      AUDIO_CLOSE(audio)
  60.      return 0;
  61.  
  62. }

I am still working on it. I assume its thread safe but I really haven't
checked that thoroughly. Feel free to download and try it out.

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