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Slow down audio slightly to match target FPS

This commit is contained in:
Jeffrey Pfau 2014-01-20 20:02:44 -08:00
parent dccde662c6
commit 98c8b42b0f
2 changed files with 4 additions and 2 deletions
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2
src/platform/sdl/gl-main.c
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@ -95,7 +95,7 @@ static int _GBASDLInit(struct GLSoftwareRenderer* renderer) {
GBASDLInitEvents(&renderer->events); GBASDLInitEvents(&renderer->events);
GBASDLInitAudio(&renderer->audio); GBASDLInitAudio(&renderer->audio);
SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 0); SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 1);
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8); SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8); SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8); SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);

4
src/platform/sdl/sdl-audio.c
View File

@ -4,6 +4,7 @@
#include "gba-thread.h" #include "gba-thread.h"
#define BUFFER_SIZE (GBA_AUDIO_SAMPLES >> 2) #define BUFFER_SIZE (GBA_AUDIO_SAMPLES >> 2)
#define FPS_TARGET 60.f
struct StereoSample { struct StereoSample {
Sint16 left; Sint16 left;
@ -87,7 +88,8 @@ static void _GBASDLAudioCallback(void* context, Uint8* data, int len) {
memset(data, 0, len); memset(data, 0, len);
return; return;
} }
audioContext->ratio = audioContext->obtainedSpec.freq / (float) audioContext->audio->sampleRate; float ratio = 280896.0f * FPS_TARGET / GBA_ARM7TDMI_FREQUENCY;
audioContext->ratio = audioContext->obtainedSpec.freq / ratio / (float) audioContext->audio->sampleRate;
struct StereoSample* ssamples = (struct StereoSample*) data; struct StereoSample* ssamples = (struct StereoSample*) data;
len /= 2 * audioContext->obtainedSpec.channels; len /= 2 * audioContext->obtainedSpec.channels;
if (audioContext->obtainedSpec.channels == 2) { if (audioContext->obtainedSpec.channels == 2) {