From 65ffdf410ca5c36f059bee8619f87147f802a82e Mon Sep 17 00:00:00 2001
From: Mitja Felicijan <mitja.felicijan@gmail.com>
Date: Tue, 8 Oct 2024 06:05:51 +0200
Subject: Renamed to experiments and added watch for changes

---
 experiments/soundfont_from_file.c | 76 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 experiments/soundfont_from_file.c

(limited to 'experiments/soundfont_from_file.c')

diff --git a/experiments/soundfont_from_file.c b/experiments/soundfont_from_file.c
new file mode 100644
index 0000000..8518744
--- /dev/null
+++ b/experiments/soundfont_from_file.c
@@ -0,0 +1,76 @@
+#include "../minisdl_audio.h"
+
+#define TSF_IMPLEMENTATION
+#include "../tsf.h"
+
+// Holds the global instance pointer
+static tsf* g_TinySoundFont;
+
+// A Mutex so we don't call note_on/note_off while rendering audio samples
+static SDL_mutex* g_Mutex;
+
+static void AudioCallback(void* data, Uint8 *stream, int len) {
+	// Render the audio samples in float format
+	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);
+}
+
+int main(int argc, char *argv[]) {
+	int i, Notes[7] = { 48, 50, 52, 53, 55, 57, 59 };
+
+	// Define the desired audio output format we request
+	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");
+		return 1;
+	}
+
+	// Load the SoundFont from a file
+	g_TinySoundFont = tsf_load_filename("../soundfonts/florestan-subset.sf2");
+	if (!g_TinySoundFont) {
+		fprintf(stderr, "Could not load SoundFont\n");
+		return 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");
+		return 1;
+	}
+
+	// Start the actual audio playback here
+	// The audio thread will begin to call our AudioCallback function
+	SDL_PauseAudio(0);
+
+	// Loop through all the presets in the loaded SoundFont
+	for (i = 0; i < tsf_get_presetcount(g_TinySoundFont); i++) {
+		//Get exclusive mutex lock, end the previous note and play a new note
+		printf("Play note %d with preset #%d '%s'\n", Notes[i % 7], i, tsf_get_presetname(g_TinySoundFont, i));
+		SDL_LockMutex(g_Mutex);
+		tsf_note_off(g_TinySoundFont, i - 1, Notes[(i - 1) % 7]);
+		tsf_note_on(g_TinySoundFont, i, Notes[i % 7], 1.0f);
+		SDL_UnlockMutex(g_Mutex);
+		SDL_Delay(1000);
+	}
+
+	// We could call tsf_close(g_TinySoundFont) and SDL_DestroyMutex(g_Mutex)
+	// here to free the memory and resources but we just let the OS clean up
+	// because the process ends here.
+	return 0;
+}
+
-- 
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