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fixed fast forward

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This commit is contained in:
Samuel Walker 2025-02-18 19:45:13 -07:00
parent 37c4d267c4
commit 89a1b4cec6
Signed by: piwalker
GPG Key ID: 616B1928705EA4C9
5 changed files with 17 additions and 29 deletions
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2
include/audio.h
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@ -127,8 +127,6 @@ typedef struct {
float right_cap;
int history_timer;
float smooth_left;
float smooth_right;
double cycles_needed;

1
include/common.h
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@ -10,6 +10,7 @@ typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
#define FAST_FORWARD_SPEED 2
#define BIT(a, n) ((a & (1 << n)) ? 1 : 0)
#define BIT_SET(a, n, on) {if(on) a |= (1 << n); else a &= ~(1 << n);}
#define BETWEEN(a, b, c) ((a >= b) && (a <= c))

1
include/emu.h
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@ -8,6 +8,7 @@ typedef struct {
bool die;
u64 ticks;
const char *app_path;
bool fast_forward;
} emu_context;
int emu_run(int, char**);

32
lib/audio.c
View File

@ -8,10 +8,9 @@
#include <math.h>
#include <string.h>
#define SAMPLE_RATE 44100.0
#define SAMPLE_RATE 192000.0
#define FRAMES_PER_BUFFER 64
#define SAMPLES_PER_AUDIO_TICK SAMPLE_RATE / 4194304.0
#define LPF_BETA 0.025f
#define HISTORY_INTERVAL 5
const u8 square_sample_00[8] = {
@ -282,19 +281,8 @@ void audio_sample_tick() {
u8 right_vol = ctx.volume_right == 0 ? 1 : ctx.volume_right;
left *= (float)left_vol/7.0f;
right *= (float)right_vol/7.0f;
ctx.smooth_left = ctx.smooth_left - (LPF_BETA * (ctx.smooth_left - left));
ctx.smooth_right = ctx.smooth_right - (LPF_BETA * (ctx.smooth_right - right));
ctx.cycles_needed += SAMPLES_PER_AUDIO_TICK;
ctx.cycles_needed += emu_get_context()->fast_forward ? SAMPLES_PER_AUDIO_TICK/FAST_FORWARD_SPEED : SAMPLES_PER_AUDIO_TICK;
if(ctx.cycles_needed > 1){
//printf("tick\n");
//if(ctx.buffer_cnt == AUDIO_BUFFER_SIZE){
//ctx.buffer_cnt--;
//ctx.sq1_read_index++;
//ctx.sq1_read_index %= AUDIO_BUFFER_SIZE;
//delay(1);
//printf("overflow\n");
//return;
//}
ctx.cycles_needed -= 1;
@ -302,10 +290,10 @@ void audio_sample_tick() {
float left_out = 0;
float right_out = 0;
if(dacs) {
left_out = ctx.smooth_left - ctx.left_cap;
right_out = ctx.smooth_right - ctx.right_cap;
ctx.left_cap = ctx.smooth_left - left_out * 0.999958;
ctx.right_cap = ctx.smooth_right - right_out * 0.999958;
left_out = left - ctx.left_cap;
right_out = right - ctx.right_cap;
ctx.left_cap = left - left_out * 0.999958;
ctx.right_cap = right - right_out * 0.999958;
}
@ -325,10 +313,12 @@ void audio_sample_tick() {
right_out = 1;
}
ctx.left_audio_buffer[(ctx.buffer_write_index)] = left_out;
ctx.right_audio_buffer[(ctx.buffer_write_index)] = right_out;
if(ctx.buffer_write_index < FRAMES_PER_BUFFER){
ctx.left_audio_buffer[(ctx.buffer_write_index)] = left_out;
ctx.right_audio_buffer[(ctx.buffer_write_index)] = right_out;
ctx.buffer_write_index++;
}
ctx.buffer_write_index++;
ctx.history_timer++;
if(ctx.history_timer >= HISTORY_INTERVAL){
ctx.history_timer = 0;

8
lib/ui.c
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@ -282,13 +282,11 @@ void ui_update() {
update_debug_window();
}
static bool ff = false;
void ui_on_key(bool down, u32 key_code) {
if(key_code == SDLK_SPACE && down == true) {
ff = !ff;
if(ff){
ppu_get_context()->target_frame_time = 1000/300;
emu_get_context()->fast_forward = !emu_get_context()->fast_forward;
if(emu_get_context()->fast_forward){
ppu_get_context()->target_frame_time = 1000/(60 * FAST_FORWARD_SPEED);
} else {
ppu_get_context()->target_frame_time = 1000/60;
}