nice refactors, now way cleaner to work with!

src/sound/wav.c

@@ -0,0 +1,71 @@
+#include "sound/wav.h"
+#include <stdint.h>
+#include <stdio.h>
+
+
+static void write_u16(FILE *f, uint16_t v) {
+    uint8_t b[2];
+    b[0] = (uint8_t)(v & 0xff);
+    b[1] = (uint8_t)((v >> 8) & 0xff);
+    fwrite(b, 1, 2, f);
+}
+
+static void write_u32(FILE *f, uint32_t v) {
+    uint8_t b[4];
+    b[0] = (uint8_t)(v & 0xff);
+    b[1] = (uint8_t)((v >> 8) & 0xff);
+    b[2] = (uint8_t)((v >> 16) & 0xff);
+    b[3] = (uint8_t)((v >> 24) & 0xff);
+    fwrite(b, 1, 4, f);
+}
+
+int wave_open(wav_t *wav, const char *filename, uint32_t sample_rate) {
+
+    wav->file = fopen(filename, "wb");
+    if (!wav->file)
+        return 0;
+
+    wav->sample_rate = sample_rate;
+    wav->samples_written = 0;
+
+    /* RIFF header */
+    fwrite((uint8_t[]){'R','I','F','F'}, 1, 4, wav->file);
+    write_u32(wav->file, 0);               // Placeholder for file size
+    fwrite((uint8_t[]){'W','A','V','E'}, 1, 4, wav->file);
+
+    /* fmt chunk */
+    fwrite((uint8_t[]){'f','m','t',' '}, 1, 4, wav->file);
+    write_u32(wav->file, 16);               // PCM chunk size
+    write_u16(wav->file, 1);                // Audio format (1 = PCM)
+    write_u16(wav->file, 1);                // Channels (1 = mono)
+    write_u32(wav->file, sample_rate);      // Sample rate
+    write_u32(wav->file, sample_rate * 2);  // Byte rate (sr * block_align)
+    write_u16(wav->file, 2);                // Block align (mono 16-bit = 2)
+    write_u16(wav->file, 16);               // Bits per sample
+
+    /* data chunk */
+    fwrite((uint8_t[]){'d','a','t','a'}, 1, 4, wav->file);
+    write_u32(wav->file, 0);  // Placeholder for data size
+
+    return 1;
+}
+void wave_write_sample(wav_t *wav, int16_t sample) {
+    write_u16(wav->file, (uint16_t)sample);
+    wav->samples_written++;
+}
+
+void wave_close(wav_t *wav) {
+
+    uint32_t data_size = wav->samples_written * 2;
+    uint32_t file_size = 36 + data_size;
+
+    /* Patch RIFF size */
+    fseek(wav->file, 4, SEEK_SET);
+    write_u32(wav->file, file_size);
+
+    /* Patch data chunk size */
+    fseek(wav->file, 40, SEEK_SET);
+    write_u32(wav->file, data_size);
+
+    fclose(wav->file);
+}