48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
#include <SDL2/SDL.h>
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#include "audio_api.h"
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static SDL_AudioDeviceID dev;
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static bool audio_sdl_init(void) {
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if (SDL_Init(SDL_INIT_AUDIO) != 0) {
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fprintf(stderr, "SDL init error: %s\n", SDL_GetError());
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return false;
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}
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SDL_AudioSpec want, have;
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SDL_zero(want);
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want.freq = 32000;
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want.format = AUDIO_S16;
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want.channels = 2;
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want.samples = 512;
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want.callback = NULL;
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dev = SDL_OpenAudioDevice(NULL, 0, &want, &have, 0);
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if (dev == 0) {
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fprintf(stderr, "SDL_OpenAudio error: %s\n", SDL_GetError());
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return false;
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}
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SDL_PauseAudioDevice(dev, 0);
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return true;
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}
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static int audio_sdl_buffered(void) {
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return SDL_GetQueuedAudioSize(dev) / 4;
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}
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static int audio_sdl_get_desired_buffered(void) {
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return 1100;
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}
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static void audio_sdl_play(const uint8_t *buf, size_t len) {
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if (audio_sdl_buffered() < 6000) {
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// Don't fill the audio buffer too much in case this happens
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SDL_QueueAudio(dev, buf, len);
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}
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}
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struct AudioAPI audio_sdl = {
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audio_sdl_init,
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audio_sdl_buffered,
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audio_sdl_get_desired_buffered,
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audio_sdl_play
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}; |