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round number of buffered audio frames up to the next power of two

This commit is contained in:
Anthony Pesch 2017-10-20 08:52:18 -04:00
parent 76bdc3fe5d
commit c662ab2022
3 changed files with 17 additions and 2 deletions
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11
src/core/math.h
View File

@ -13,6 +13,17 @@
#define ALIGN_UP(v, alignment) (((v) + (alignment)-1) & ~((alignment)-1))
#define ALIGN_DOWN(v, alignment) ((v) & ~((alignment)-1))
static inline uint32_t npow2(uint32_t v) {
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v++;
return v;
}
static inline uint32_t bswap24(uint32_t v) {
return ((v & 0xff) << 16) | (v & 0x00ff00) | ((v & 0xff0000) >> 16);
}

6
src/host/sdl_host.c
View File

@ -151,13 +151,17 @@ static void audio_destroy_device(struct host *host) {
}
static int audio_create_device(struct host *host) {
/* SDL expects the number of buffered frames to be a power of two */
int target_frames = MS_TO_AUDIO_FRAMES(OPTION_latency);
target_frames = (int)npow2((uint32_t)target_frames);
/* match AICA output format */
SDL_AudioSpec want;
SDL_zero(want);
want.freq = AUDIO_FREQ;
want.format = AUDIO_S16LSB;
want.channels = 2;
want.samples = MS_TO_AUDIO_FRAMES(OPTION_latency);
want.samples = target_frames;
want.userdata = host;
want.callback = audio_write_cb;

2
src/options.c
View File

@ -2,7 +2,7 @@
#include "core/core.h"
#include "host/keycode.h"
const int LATENCY_PRESETS[] = {50, 75, 100, 125, 150};
const int LATENCY_PRESETS[] = {45, 90, 180};
const int NUM_LATENCY_PRESETS = ARRAY_SIZE(LATENCY_PRESETS);
const char *ASPECT_RATIOS[] = {