82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
#include "audio.h"
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#include <stdio.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <sys/time.h>
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extern "C"
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{
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#include "../src/libsm64.h"
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#include "context.h"
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}
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static SDL_AudioDeviceID dev;
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pthread_t gSoundThread;
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long long timeInMilliseconds(void)
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{
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struct timeval tv;
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gettimeofday(&tv, nullptr);
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return (long long)tv.tv_sec * 1000 + tv.tv_usec / 1000;
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}
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void *audio_thread(void *keepAlive)
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{
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// from https://github.com/ckosmic/libsm64/blob/audio/src/libsm64.c#L535-L555
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// except keepAlive is a null pointer here, so don't use it
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pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, nullptr);
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pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, nullptr);
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long long currentTime = timeInMilliseconds();
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long long targetTime = 0;
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while (1)
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{
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//if(!*((bool*)keepAlive)) return nullptr;
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int16_t audioBuffer[544 * 2 * 2];
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uint32_t numSamples = sm64_audio_tick(SDL_GetQueuedAudioSize(dev) / 4, 1100, audioBuffer);
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if (SDL_GetQueuedAudioSize(dev) / 4 < 6000)
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SDL_QueueAudio(dev, audioBuffer, numSamples * 2 * 4);
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targetTime = currentTime + 33;
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while (timeInMilliseconds() < targetTime)
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{
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usleep(100);
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//if(!*((bool*)keepAlive)) return nullptr;
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}
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currentTime = timeInMilliseconds();
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}
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}
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void audio_init()
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{
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if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0)
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{
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fprintf(stderr, "SDL_InitSubSystem(SDL_INIT_AUDIO) failed: %s\n", SDL_GetError());
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return;
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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 = nullptr;
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dev = SDL_OpenAudioDevice(nullptr, 0, &want, &have, 0);
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if (dev == 0)
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{
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fprintf(stderr, "SDL_OpenAudio error: %s\n", SDL_GetError());
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return;
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}
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SDL_PauseAudioDevice(dev, 0);
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// it's best to run audio in a separate thread
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pthread_create(&gSoundThread, nullptr, audio_thread, nullptr);
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}
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