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Refactor out audio conversion.

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This commit is contained in:
Themaister 2011-10-15 17:47:29 +02:00
parent e91ebdac97
commit 5bcf601a40
2 changed files with 28 additions and 7 deletions
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24
audio/utils.h Normal file
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@ -0,0 +1,24 @@
#ifndef AUDIO_UTILS_H
#define AUDIO_UTILS_H
#include <stdint.h>
static inline void audio_convert_s16_to_float(float *out,
const int16_t *in, unsigned samples)
{
for (unsigned i = 0; i < samples; i++)
out[i] = (float)in[i] / 0x8000;
}
static inline void audio_convert_float_to_s16(int16_t *out,
const float *in, unsigned samples)
{
for (unsigned i = 0; i < samples; i++)
{
int32_t val = in[i] * 0x8000;
out[i] = (val > 0x7FFF) ? 0x7FFF : (val < -0x8000 ? -0x8000 : (int16_t)val);
}
}
#endif

11
ssnes.c
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@ -36,6 +36,7 @@
#include "strl.h" #include "strl.h"
#include "screenshot.h" #include "screenshot.h"
#include "cheats.h" #include "cheats.h"
#include "audio/utils.h"
#include <assert.h> #include <assert.h>
#ifdef _WIN32 #ifdef _WIN32
@ -187,8 +188,7 @@ static void video_frame(const uint16_t *data, unsigned width, unsigned height)
static bool audio_flush(const int16_t *data, unsigned samples) static bool audio_flush(const int16_t *data, unsigned samples)
{ {
for (unsigned i = 0; i < samples; i++) audio_convert_s16_to_float(g_extern.audio_data.data, data, samples);
g_extern.audio_data.data[i] = (float)data[i] / 0x8000;
const float *output_data = NULL; const float *output_data = NULL;
unsigned output_frames = 0; unsigned output_frames = 0;
@ -247,11 +247,8 @@ static bool audio_flush(const int16_t *data, unsigned samples)
} }
else else
{ {
for (unsigned i = 0; i < output_frames * 2; i++) audio_convert_float_to_s16(g_extern.audio_data.conv_outsamples,
{ output_data, output_frames * 2);
int32_t val = output_data[i] * 0x8000;
g_extern.audio_data.conv_outsamples[i] = (val > 0x7FFF) ? 0x7FFF : (val < -0x8000 ? -0x8000 : (int16_t)val);
}
if (driver.audio->write(driver.audio_data, g_extern.audio_data.conv_outsamples, output_frames * sizeof(int16_t) * 2) < 0) if (driver.audio->write(driver.audio_data, g_extern.audio_data.conv_outsamples, output_frames * sizeof(int16_t) * 2) < 0)
{ {