/* pos = current frame. */
pos = 0;
/* number of frames can be played with the current AY register.*/
left = 0;
rate = audio_format.channels * ( audio_format.bits / 8 );
/*number of frames played.*/
donow = 0;
do
{
stream = sndbuf;
/* fill partialy sound buffer frame by frame.
need is the number of frames remaining.*/
for ( need = SNDNEED ; need > 0 ; need -= donow )
{
if ( left > 0 )
{
/* stream current frame. */
donow = ( need > left ) ? left : need;
left -= donow;
stream = ayemu_gen_sound ( &ay ,
(char*)stream , donow * rate );
}
else
{
/* get next frame clean buffer. */
if ( pos++ > vtx->frames )
{
end = 1;
donow = need;
memset (stream , 0 , donow*rate );
}
else
{
/* get current frame and unpack data. */
ayemu_vtx_getframe ( vtx , pos
, regs );
/* left =
audio_frequency/player_frequency ??? */
left = 44100 / vtx->playerFreq;
ayemu_set_regs ( &ay , regs );
donow = 0;
}
}
}
Thats all i can know.
Now its simple, you need more informations about weirds operations?
need more informations about his working, you have 2 solutions, either
you studying under AY/YM sound chip or you simply forget this plugin.
I've contacted the author about these weird operations and i'm waiting
reply since yesturday.
2009/11/3, Max Kellermann <m...@duempel.org>:
> On 2009/11/03 16:10, kernel error <k3rn3l.3r...@gmail.com> wrote:
>> After take a lookt at source code, I'm guessing the code doen't fill
>> completly the buffer, it fill only a part of song frame by frame, so
>> thats an essential part of code, i can't remove this loop.
>
> Stop guessing.
>
> - I don't see any "frame by frame" code, please point me to it.
>
> - what is the meaning of "need", "donow", "left", "pos"?
>
> - why does the loop call memset()? Why does it generate zeroes after
> the end of the song?
>
> - why does the loop alternate between two states? (gen_sound and
> getframe) Why not just call these two sequentially?
>
> - what if ayemu_gen_sound() generates less than the specified number
> of bytes?
>
> - "44100 / vtx->playerFreq" what does that formula do?
>
--
Regards,
kernel_error
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