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Samplerate stuff

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This commit is contained in:
Themaister 2010-05-26 22:42:58 +02:00
parent 7c678fc334
commit d3cec173ac
3 changed files with 86 additions and 11 deletions
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2
Makefile
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@ -6,7 +6,7 @@ CFLAGS = -O3 -march=native -Wall
OBJ = ssnes.o
SOBJ = libsnes.so
LIBS = -lrsound -lglfw
LIBS = -lrsound -lglfw -lsamplerate
all:
$(CC) $(CFLAGS) -o $(TARGET) $(SOURCE) $(SOBJ) $(LIBS)

7
config.h
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@ -36,6 +36,13 @@ static const unsigned fullscreen_y = 1200;
// Video VSYNC (recommended)
static const bool vsync = true;
// Audio
static const unsigned out_rate = 48000;
static const unsigned in_rate = 31950;
// Input samplerate from libSNES.
// Lower this if you are experiencing frequent audio dropouts and vsync is enabled.
// Keybinds
static const struct snes_keybind snes_keybinds[] = {
{ SNES_DEVICE_ID_JOYPAD_A, 'X', 1 },

88
ssnes.c
View File

@ -1,4 +1,5 @@
#include <GL/glfw.h>
#include <samplerate.h>
#include "libsnes.hpp"
#include <stdio.h>
#include <stdlib.h>
@ -7,7 +8,17 @@
#include "config.h"
///// RSound
static rsound_t *rd;
static rsound_t *rd = NULL;
static void audio_write(const void *data, size_t size);
///// samplerate
static SRC_STATE* source = NULL;
static float *src_input = NULL;
static float *src_output = NULL;
static size_t src_input_size = 0;
static size_t src_output_size = 0;
static size_t src_input_ptr = 0;
///// GL
@ -16,6 +27,7 @@ static uint8_t* gl_buffer;
static void GLFWCALL resize(int width, int height);
static void init_gl(void);
static void uninit_gl(void);
static void uninit_audio(void);
static void uninit_gl(void)
{
@ -103,9 +115,9 @@ static void init_audio(void)
{
rsd_init(&rd);
int channels = 2;
int rate = 32000;
int rate = out_rate;
int format = RSD_S16_LE;
int latency = 64;
int latency = 80;
rsd_set_param(rd, RSD_CHANNELS, &channels);
rsd_set_param(rd, RSD_SAMPLERATE, &rate);
rsd_set_param(rd, RSD_FORMAT, &format);
@ -115,12 +127,38 @@ static void init_audio(void)
fprintf(stderr, "FAILED TO START RSD\n");
exit(1);
}
int err;
source = src_new(SRC_SINC_MEDIUM_QUALITY, 2, &err);
if ( source == NULL )
{
fprintf(stderr, "Couldn't init libsamplerate\n");
exit(1);
}
src_set_ratio(source, (double)out_rate / (double)in_rate);
src_input_size = in_rate * 2 * sizeof(float) / 100;
src_output_size = out_rate * 2 * sizeof(float) / 100;
src_input = malloc ( src_input_size );
src_output = malloc ( src_output_size );
}
static void uninit_audio(void)
{
rsd_stop(rd);
rsd_free(rd);
if ( rd )
{
rsd_stop(rd);
rsd_free(rd);
rd = NULL;
}
if ( source )
{
src_delete(source);
source = NULL;
}
free (src_input); src_input = NULL;
free (src_output); src_output = NULL;
}
static void video_refresh_GL(const uint16_t* data, unsigned width, unsigned height)
@ -176,16 +214,46 @@ static void video_refresh_GL(const uint16_t* data, unsigned width, unsigned heig
static void audio_refresh(uint16_t left, uint16_t right)
{
uint16_t samples[2] = {left, right};
src_input[src_input_ptr++] = (float)left;
src_input[src_input_ptr++] = (float)right;
SRC_DATA data;
if ( src_input_ptr == src_input_size )
{
data.input_frames = src_input_ptr / 4;
data.output_frames = src_output_size / 4;
data.data_in = src_input;
data.data_out = src_output;
data.src_ratio = (double)out_rate / (double)in_rate;
src_process(source, &data);
}
memmove(src_input, (uint32_t*)src_input + data.input_frames_used, src_input_size - data.input_frames_used * 4);
uint16_t outdata[data.output_frames_gen * 2];
int i;
for ( i = 0; i < data.output_frames_gen * 2; i++ )
{
outdata[i] = (uint16_t)src_output[i];
}
audio_write(outdata, data.output_frames_gen * 2);
}
static void audio_write(const void* data, size_t size)
{
rsd_delay_wait(rd);
if ( rsd_write(rd, samples, 4) < 4 )
if ( rsd_write(rd, data, size) == 0 )
fprintf(stderr, "WTF!!\n");
if ( rsd_delay_ms(rd) < 32 )
if ( rsd_delay_ms(rd) < 40 )
{
int ms = 32;
size_t size = (ms * 32000 * 4) / 1000;
int ms = 30;
size_t size = (ms * out_rate * 4) / 1000;
void *temp = calloc(1, size);
rsd_write(rd, temp, size);
free(temp);