source: Refactor out common async logic

1 files changed, 24 insertions, 0 deletions

diff --git a/src/source_private.h b/src/source_private.h
new file mode 100644
index 0000000..39b41fe
--- /dev/null
+++ b/src/source_private.h
@@ -0,0 +1,24 @@
+#ifndef IMV_SOURCE_PRIVATE_H
+#define IMV_SOURCE_PRIVATE_H
+
+struct imv_image;
+struct imv_source;
+
+struct imv_source_vtable {
+  /* Loads the first frame, if successful puts output in image and duration
+   * (in milliseconds) in frametime. If unsuccessful, image shall be NULL. A
+   * still image should use a frametime of 0.
+   */
+  void (*load_first_frame)(void *private, struct imv_image **image, int *frametime);
+  /* Loads the next frame, if successful puts output in image and duration
+   * (in milliseconds) in frametime. If unsuccessful, image shall be NULL.
+   */
+  void (*load_next_frame)(void *private, struct imv_image **image, int *frametime);
+  /* Cleans up the private section of a source */
+  void (*free)(void *private);
+};
+
+/* Build a source given its vtable and a pointer to the private data */
+struct imv_source *imv_source_create(const struct imv_source_vtable *vt, void *private);
+
+#endif