Merge branch '8-add-tui' - tests not passing

engine/src/wav.c

@@ -0,0 +1,41 @@
+#include "wav.h"
+#include "channel.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <sndfile.h>
+
+int wav_read(const char *path, float **buffer, unsigned *frames) {
+    SF_INFO info;
+    info.format = 0;
+    SNDFILE *sf = sf_open(path, SFM_READ, &info);
+    if (!sf) return -1;
+
+    /* We need mono 16-bit PCM; refuse anything else */
+    if (info.channels != 1 || info.samplerate <= 0) {
+        sf_close(sf);
+        return -1;
+    }
+
+    unsigned total = (info.frames > (sf_count_t)LOOP_BUF_SIZE) ? LOOP_BUF_SIZE : (unsigned)info.frames;
+    float *buf = (float*)malloc(total * sizeof(float));
+    if (!buf) { sf_close(sf); return -1; }
+
+    sf_count_t nread = sf_readf_float(sf, buf, total);
+    sf_close(sf);
+    *buffer = buf;
+    *frames = (unsigned)nread;
+    return 0;
+}
+
+int wav_write(const char *path, const float *data, unsigned frames, unsigned sample_rate) {
+    SF_INFO info;
+    info.samplerate = sample_rate;
+    info.channels = 1;
+    info.format = SF_FORMAT_WAV | SF_FORMAT_PCM_16;
+    SNDFILE *sf = sf_open(path, SFM_WRITE, &info);
+    if (!sf) return -1;
+
+    sf_writef_float(sf, data, frames);
+    sf_close(sf);
+    return 0;
+}