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#include <stdio.h>
#include <unistd.h>
#include "synth.h"
#include "minisdl_audio.h"
#define TSF_IMPLEMENTATION
#include "tsf.h"
static tsf* g_TinySoundFont;
static SDL_mutex* g_Mutex;
// Render the audio samples in float format.
static void AudioCallback(void* data, Uint8 *stream, int len) {
int SampleCount = (len / (2 * sizeof(float))); // 2 output channels.
SDL_LockMutex(g_Mutex); // Get exclusive lock.
tsf_render_float(g_TinySoundFont, (float*)stream, SampleCount, 0);
SDL_UnlockMutex(g_Mutex);
}
void *synth(void *arg) {
SynthArgs* args = (SynthArgs*)arg;
SDL_AudioSpec OutputAudioSpec;
OutputAudioSpec.freq = 44100;
OutputAudioSpec.format = AUDIO_F32;
OutputAudioSpec.channels = 2;
OutputAudioSpec.samples = 4096;
OutputAudioSpec.callback = AudioCallback;
// Initialize the audio system.
if (SDL_AudioInit(TSF_NULL) < 0) {
fprintf(stderr, "Could not initialize audio hardware or driver\n");
exit(1);
}
// Load the SoundFont from a file.
g_TinySoundFont = tsf_load_filename(args->soundfont_file);
if (!g_TinySoundFont) {
fprintf(stderr, "Could not load SoundFont\n");
exit(1);
}
// Set the SoundFont rendering output mode.
tsf_set_output(g_TinySoundFont, TSF_STEREO_INTERLEAVED, OutputAudioSpec.freq, 0);
// Create the mutex.
g_Mutex = SDL_CreateMutex();
// Request the desired audio output format.
if (SDL_OpenAudio(&OutputAudioSpec, TSF_NULL) < 0) {
fprintf(stderr, "Could not open the audio hardware or the desired audio output format\n");
exit(1);
}
SDL_PauseAudio(0);
while (1) {
sleep(1);
SDL_LockMutex(g_Mutex);
tsf_note_off(g_TinySoundFont, 1, 50);
tsf_note_on(g_TinySoundFont, 1, 50, 1.0f);
SDL_UnlockMutex(g_Mutex);
}
}
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