mirror/RetroArch
1
0
Fork 0
mirror of https://github.com/libretro/RetroArch synced 2025-02-20 15:40:44 +00:00
Code Issues Packages Projects Releases Wiki Activity

Hardcode hermite for 2 channels.

Browse Source
This commit is contained in:
Themaister 2011-10-20 22:26:41 +02:00
parent c55ce543c2
commit 5d1d188231
3 changed files with 7 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
audio/hermite.c
View File

@ -20,13 +20,12 @@
#include "hermite.h"
#include <stdlib.h>
#define MAX_CHANS 8
#define CHANNELS 2
struct hermite_resampler
{
float chan_data[MAX_CHANS][4];
float chan_data[CHANNELS][4];
double r_frac;
unsigned chans;
};
static inline float hermite_kernel(float mu1, float a, float b, float c, float d)
@ -47,15 +46,11 @@ static inline float hermite_kernel(float mu1, float a, float b, float c, float d
return (a0 * b) + (a1 * m0) + (a2 * m1) + (a3 * c);
}
hermite_resampler_t *hermite_new(unsigned channels)
hermite_resampler_t *hermite_new(void)
{
if (channels > MAX_CHANS)
return NULL;
hermite_resampler_t *re = calloc(1, sizeof(*re));
if (!re)
return NULL;
re->chans = channels;
return re;
}
@ -75,7 +70,7 @@ void hermite_process(hermite_resampler_t *re, struct hermite_data *data)
while (re->r_frac <= 1.0 && processed_out < out_frames)
{
re->r_frac += r_step;
for (unsigned i = 0; i < re->chans; i++)
for (unsigned i = 0; i < CHANNELS; i++)
{
float res = hermite_kernel(re->r_frac,
re->chan_data[i][0], re->chan_data[i][1], re->chan_data[i][2], re->chan_data[i][3]);
@ -88,7 +83,7 @@ void hermite_process(hermite_resampler_t *re, struct hermite_data *data)
{
re->r_frac -= 1.0;
for (unsigned i = 0; i < re->chans; i++)
for (unsigned i = 0; i < CHANNELS; i++)
{
re->chan_data[i][0] = re->chan_data[i][1];
re->chan_data[i][1] = re->chan_data[i][2];

2
audio/hermite.h
View File

@ -26,7 +26,7 @@
typedef struct hermite_resampler hermite_resampler_t;
hermite_resampler_t *hermite_new(unsigned channels);
hermite_resampler_t *hermite_new(void);
struct hermite_data
{

2
driver.c
View File

@ -251,7 +251,7 @@ void init_audio(void)
else
g_extern.audio_data.chunk_size = g_extern.audio_data.block_chunk_size;
g_extern.audio_data.source = hermite_new(2);
g_extern.audio_data.source = hermite_new();
if (!g_extern.audio_data.source)
g_extern.audio_active = false;