Some changes

peripherals/audio.h

@@ -0,0 +1,55 @@
+/*
+// Created by bruno on 16.2.2025.
+*/
+
+#ifndef RISCB_AUDIO_H
+#define RISCB_AUDIO_H
+
+#include <SDL2/SDL.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define SAMPLE_RATE 44100
+#define NUM_SYNTH_VOICES 3
+#define PCM_BUFFER_SIZE 4096
+
+typedef enum {
+    WAVE_SINE,
+    WAVE_SQUARE,
+    WAVE_SAWTOOTH,
+    WAVE_TRIANGLE,
+    WAVE_NOISE
+} Waveform;
+
+typedef struct {
+    uint8_t volume;
+    uint16_t frequency;
+    uint8_t phase;
+    Waveform waveform;
+} SynthVoice;
+
+typedef struct {
+    uint8_t volume;
+    uint8_t upsample_factor;
+    uint8_t upsample_count;
+    uint16_t buffer[PCM_BUFFER_SIZE];
+    size_t head, tail;
+} PcmVoice;
+
+typedef struct {
+    SynthVoice synthVoices[NUM_SYNTH_VOICES];
+    PcmVoice pcmVoice;
+} AudioData;
+
+int pcm_buffer_empty(PcmVoice *pcm);
+
+int pcm_buffer_full(PcmVoice *pcm);
+
+void pcm_buffer_push(PcmVoice *pcm, uint16_t sample);
+
+uint16_t pcm_buffer_pop(PcmVoice *pcm);
+
+void audio_callback(void *userdata, Uint8 *stream, int len);
+
+#endif //RISCB_AUDIO_H