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PCM sound, refactored code940

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@27 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-02-04 17:15:31 +00:00
parent 7573607016
commit 4f265db776
28 changed files with 914 additions and 312 deletions
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57
Pico/sound/mix.c Normal file
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@ -0,0 +1,57 @@
#define MAXOUT (+32767)
#define MINOUT (-32768)
/* limitter */
#define Limit(val, max,min) { \
if ( val > max ) val = max; \
else if ( val < min ) val = min; \
}
void memcpy32(int *dest, int *src, int count)
{
while (count--)
*dest++ = *src++;
}
void memset32(int *dest, int c, int count)
{
while (count--)
*dest++ = c;
}
void mix_32_to_16l_stereo(short *dest, int *src, int count)
{
int l, r;
for (; count > 0; count--)
{
l = r = *dest;
l += *src++;
r += *src++;
Limit( l, MAXOUT, MINOUT );
Limit( r, MAXOUT, MINOUT );
*dest++ = l;
*dest++ = r;
}
}
void mix_32_to_16_mono(short *dest, int *src, int count)
{
int l;
for (; count > 0; count--)
{
l = *dest;
l += *src++;
Limit( l, MAXOUT, MINOUT );
*dest++ = l;
}
}