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psp mp3 implementation

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@293 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-11-10 22:43:26 +00:00
parent b5e5172d04
commit 4b167c12c7
14 changed files with 557 additions and 40 deletions
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19
Pico/sound/mix.c
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@ -39,16 +39,33 @@ void mix_32_to_16_mono(short *dest, int *src, int count)
}
/* unimplemented... */
void mix_16h_to_32(int *dest_buf, short *mp3_buf, int count)
{
while (count--)
{
*dest_buf++ += *mp3_buf++ >> 1;
}
}
void mix_16h_to_32_s1(int *dest_buf, short *mp3_buf, int count)
{
count >>= 1;
while (count--)
{
*dest_buf++ += *mp3_buf++ >> 1;
*dest_buf++ += *mp3_buf++ >> 1;
mp3_buf += 1*2;
}
}
void mix_16h_to_32_s2(int *dest_buf, short *mp3_buf, int count)
{
count >>= 1;
while (count--)
{
*dest_buf++ += *mp3_buf++ >> 1;
*dest_buf++ += *mp3_buf++ >> 1;
mp3_buf += 3*2;
}
}