vf_vavpp: move frame handling to separate file

Move the handling of the future/past frames and the associated dataflow
rules to a separate source file.

While this on its own seems rather questionable and just inflates the
code, I intend to reuse it for other filters. The logic is annoying
enough that it shouldn't be duplicated a bunch of times.

(I considered other ways of sharing this logic, such as an uber-
deinterlace filter, which would access the hardware deinterlacer via a
different API. Although that sounds like kind of the right approach,
this would have other problems, so let's not, at least for now.)

1 files changed, 22 insertions, 0 deletions

diff --git a/video/filter/refqueue.h b/video/filter/refqueue.h
new file mode 100644
index 0000000000..69b3987a8f
--- /dev/null
+++ b/video/filter/refqueue.h
@@ -0,0 +1,22 @@
+#ifndef MP_REFQUEUE_H_
+#define MP_REFQUEUE_H_
+
+#include <stdbool.h>
+
+// A helper for deinterlacers which require past/future reference frames.
+
+struct mp_refqueue;
+
+struct mp_refqueue *mp_refqueue_alloc(void);
+void mp_refqueue_free(struct mp_refqueue *q);
+
+void mp_refqueue_set_refs(struct mp_refqueue *q, int past, int future);
+void mp_refqueue_flush(struct mp_refqueue *q);
+void mp_refqueue_add_input(struct mp_refqueue *q, struct mp_image *img);
+bool mp_refqueue_need_input(struct mp_refqueue *q);
+bool mp_refqueue_has_output(struct mp_refqueue *q);
+void mp_refqueue_next(struct mp_refqueue *q);
+struct mp_image *mp_refqueue_get(struct mp_refqueue *q, int pos);
+double mp_refqueue_get_field_pts(struct mp_refqueue *q, int field);
+
+#endif