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-rw-r--r--src/spatial.c88
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;
+}