Re: [AL] Playing WAV files in audiostreams

[Henrik S. <hb...@ks...>]

Init stream, having a 44 byte WAV header and skipping it :

#define BUFFER_SIZE 131072

    sfp = fopen("your wav file","rb");
   fseek(sfp,0,SEEK_END);
   /* Get size of raw data we want to feed */
   ssize = ftell(sfp) - 44;
   rewind(sfp);
    /* skip the header */
   fseek(sfp,44,SEEK_SET);
   scnt = 0;

   theme = play_audio_stream(BUFFER_SIZE/2,16,FALSE,22050,128,128);

Note that the first paramter to play_audio_stream() is just half of the
buffer size we want to feed as it is counted in samples, 2 byte = 1 sample
for 16 bit. This was my biggest mistake and caused the pauses.

In the loop :

void StreamAudio(void)
{
int i,cnt;
unsigned char *buff;
unsigned short *buff2;


  buff = get_audio_stream_buffer(theme);

  if ( buff != NULL )
 {
    /* Play it again, Sam */
   if ( scnt >= ssize )
  {
    rewind(sfp);
    fseek(sfp,44,SEEK_SET);
    scnt = 0;
  }

   cnt = fread(buff,1,BUFFER_SIZE,sfp);
   scnt += cnt;
   buff2 = (unsigned short *)buff;
   for (i = 0; i < (cnt / 2); i++)
  {
    *buff2 ^= 0x8000;
    buff2++;
  }
   free_audio_stream_buffer(theme);
 }
}

My last problem is a knack sound at the end of the file when repeating it.


----- Original Message -----
From: "Owen Rudge" <ow...@os...>
To: <al...@ca...>
Sent: Saturday, November 10, 2001 2:12 PM
Subject: [AL] Playing WAV files in audiostreams


> Hi,
>
> I've been following the "allegro, windows and sound" thread closely, and
was
> wondering: can someone post some code that will play 16-bit WAV files
> without the "pauses" in between actual audio? I can't convert the WAV to
raw
> format or anything else - it must be WAV. 8-bit files play fine, but
16-bit
> doesn't.
>
> If you want, I can post my code (3.19kb in total).
>
> Thanks,
>
> Owen Rudge
> http://www.owenrudge.co.uk/
>
> MSN Messenger: or...@fr...
> ICQ: 125455765
>