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Mix sound sources in 32-bit buffer, then clip to 16-bit for output. Fixes overflow in some situations, eg MegaRace on SB16.

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This commit is contained in:
SarahW 2016-05-22 16:04:19 +01:00
commit d2b6ea7fa3
15 changed files with 60 additions and 37 deletions
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4
src/sound_adlib.c
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@ -11,7 +11,7 @@ typedef struct adlib_t
opl_t opl;
} adlib_t;
static void adlib_get_buffer(int16_t *buffer, int len, void *p)
static void adlib_get_buffer(int32_t *buffer, int len, void *p)
{
adlib_t *adlib = (adlib_t *)p;
int c;
@ -19,7 +19,7 @@ static void adlib_get_buffer(int16_t *buffer, int len, void *p)
opl2_update2(&adlib->opl);
for (c = 0; c < len * 2; c++)
buffer[c] += adlib->opl.buffer[c];
buffer[c] += (int32_t)adlib->opl.buffer[c];
adlib->opl.pos = 0;
}