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tweak filter params

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This commit is contained in:
Eric Wasylishen 2014-08-02 00:49:21 -06:00
parent 07e4fff2af
commit 2ec2f6a785
1 changed files with 11 additions and 2 deletions
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13
Quake/snd_mix.c
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@ -193,7 +193,7 @@ static void S_MakeBlackmanWindowKernel(float *kernel, int M, float f_c)
}
// must be divisible by 4
#define FILTER_KERNEL_SIZE 48
#define FILTER_KERNEL_SIZE 384
/*
==============
@ -252,6 +252,13 @@ static void S_LowpassFilter(float f_c, int *data, int stride, int count,
memcpy(memory, input + count, FILTER_KERNEL_SIZE * sizeof(float));
// zero out samples
for (i=0; i<count+FILTER_KERNEL_SIZE; i++)
{
if (i % 4 != 0)
input[i] = 0;
}
// apply the filter
for (i=0; i<count; i++)
@ -269,6 +276,8 @@ static void S_LowpassFilter(float f_c, int *data, int stride, int count,
data[i * stride] = (val[0] + val[1] + val[2] + val[3])
* (32768.0 * 256.0);
data[i * stride] = data[i * stride] << 2; //fixme: calc correct volume
}
}
@ -367,7 +376,7 @@ void S_PaintChannels (int endtime)
static float memory_l[FILTER_KERNEL_SIZE];
static float memory_r[FILTER_KERNEL_SIZE];
const float cutoff_freq = (sndspeed.value * 0.45) / shm->speed;
const float cutoff_freq = (sndspeed.value * 0.5 * 0.96) / shm->speed;
S_LowpassFilter(cutoff_freq, (int *)paintbuffer, 2, end - paintedtime, memory_l);
S_LowpassFilter(cutoff_freq, ((int *)paintbuffer) + 1, 2, end - paintedtime, memory_r);