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box filter: handle start and end of sample by repeating the first and last sample

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This commit is contained in:
Eric Wasylishen 2011-12-30 11:41:39 -07:00
parent a8e2811dc2
commit 07532b1a37
1 changed files with 8 additions and 9 deletions
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17
Quake/snd_mem.c
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@ -114,7 +114,6 @@ static void ResampleSfx (sfx_t *sfx, int inrate, int inwidth, byte *data)
}
// box filter
// FIXME: doesn't handle the start or end of the sound properly
// box_half_width is the number of samples on each side of a given sample
// that are averaged together.
@ -129,26 +128,26 @@ static void ResampleSfx (sfx_t *sfx, int inrate, int inwidth, byte *data)
int history[box_half_width];
memset(history, 0, sizeof(history));
int box_sum = 0;
for (i = 0; i < outcount; i++)
for (i = 0; i < (outcount + box_half_width); i++)
{
const int sample_at_i = getsample(sc->data, sc->width, i);
const int sample_at_i = getsample(sc->data, sc->width, CLAMP(0, i, outcount - 1));
box_sum += sample_at_i;
box_sum -= history[0];
const int newsample = box_sum / box_width;
const int write_loc = CLAMP(0, i - box_half_width, outcount - 1);
// before writing the sample at write_loc, copy it to the end of the history buffer
int j;
for (j=0; j<(box_half_width-1); j++)
{
history[j] = history[j+1];
}
history[box_half_width-1] = getsample(sc->data, sc->width, write_loc);
const int write_loc = i - box_half_width;
history[box_half_width-1] = getsample(sc->data, sc->width, CLAMP(0, write_loc, outcount - 1));
putsample(sc->data, sc->width, write_loc, newsample);
if (write_loc >= 0 && write_loc < outcount)
{
putsample(sc->data, sc->width, write_loc, newsample);
}
}
}
}