1 files changed, 88 insertions, 0 deletions
diff --git a/src/spatial.c b/src/spatial.c
new file mode 100644
index 0000000..809fce1
--- /dev/null
+++ b/src/spatial.c
@@ -0,0 +1,88 @@
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+#include <xas/spatial.h>
+
+static inline float dist(xas_spatial_coord a, xas_spatial_coord b) {
+    return powf(powf(b.x - a.x, 2.0f)
+              + powf(b.y - a.y, 2.0f)
+              + powf(b.z - a.z, 2.0f), 0.5f);
+}
+
+static int buf_realloc(xas_spatial_scene *scene, void *buf) {
+    float width = scene->observer.width,
+          speed = scene->speed;
+
+    size_t sample_rate = scene->format.sample_rate,
+           stride      = scene->format.channels * scene->format.sample_size,
+           count       = floorf(width / (speed / sample_rate));
+
+    if ((buf = realloc(buf, stride * count)) == NULL) {
+        goto error_realloc;
+    }
+
+    scene->buf    = buf;
+    scene->buflen = count;
+
+    return 0;
+
+error_realloc:
+    return -1;
+}
+
+xas_spatial_scene *xas_spatial_scene_new(xas_audio_format format,
+                                             xas_spatial_coord speaker_l,
+                                             xas_spatial_coord speaker_r) {
+    xas_spatial_scene *scene;
+
+    if ((scene = malloc(sizeof(*scene))) == NULL) {
+        goto error_malloc_scene;
+    }
+
+    memset(scene, '\0', sizeof(*scene));
+
+    scene->format    = format;
+    scene->speaker_l = speaker_l;
+    scene->speaker_r = speaker_r;
+    scene->speed     = XAS_SPATIAL_DEFAULT_SPEED;
+
+    if (buf_realloc(scene, NULL) < 0) {
+        goto error_buf_realloc;
+    }
+
+    return scene;
+
+error_buf_realloc:
+    free(scene);
+
+error_malloc_scene:
+    return NULL;
+}
+
+void xas_spatial_scene_destroy(xas_spatial_scene *scene) {
+    free(scene->buf);
+    free(scene);
+}
+
+int xas_spatial_scene_set_observer(xas_spatial_scene *scene,
+                                      xas_spatial_coord coord,
+                                      xas_spatial_rotation rotation,
+                                      float width) {
+    scene->observer.coord    = coord;
+    scene->observer.rotation = rotation;
+    scene->observer.width    = width;
+
+    return buf_realloc(scene, scene->buf);
+}
+
+void xas_spatial_scene_set_speaker_coords(xas_spatial_scene *scene,
+                                            xas_spatial_coord speaker_l,
+                                            xas_spatial_coord speaker_r) {
+    scene->speaker_l = speaker_l;
+    scene->speaker_r = speaker_r;
+}
+
+void xas_spatial_scene_set_speed(xas_spatial_scene *scene, float speed) {
+    scene->speed = speed;
+}