final src and Makefile adjustments for PSP release

[picodrive.git] / Pico / sound / mix.c

diff --git a/Pico/sound/mix.c b/Pico/sound/mix.c
index 4d68f1d..c344fba 100644 (file)
--- a/Pico/sound/mix.c
+++ b/Pico/sound/mix.c
@@ -1,3 +1,6 @@
+// some code for sample mixing
+// (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas
+
 #define MAXOUT         (+32767)
 #define MINOUT         (-32768)
 
@@ -39,16 +42,33 @@ 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;
+       }
 }