1 files changed, 57 insertions, 0 deletions
diff --git a/video/out/present_sync.h b/video/out/present_sync.h
new file mode 100644
index 0000000000..ba6d0b3bf4
--- /dev/null
+++ b/video/out/present_sync.h
@@ -0,0 +1,57 @@
+/*
+ * This file is part of mpv video player.
+ *
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * mpv is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MP_PRESENT_SYNC_H
+#define MP_PRESENT_SYNC_H
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "vo.h"
+
+/* Generic helpers for obtaining presentation feedback from
+ * backend APIs. This requires ust/msc values. */
+
+struct mp_present_entry {
+    int64_t ust;
+    int64_t msc;
+    int64_t vsync_duration;
+    int64_t skipped_vsyncs;
+    int64_t queue_display_time;
+
+    struct {
+        struct mp_present_entry *next, *prev;
+    } list_node;
+};
+
+struct mp_present {
+    struct mp_present_entry *head, *tail;
+    struct mp_vo_opts *opts;
+};
+
+struct mp_present *mp_present_initialize(void *talloc_ctx, struct mp_vo_opts *opts, int entries);
+
+// Used during the get_vsync call to deliver the presentation statistics to the VO.
+void present_sync_get_info(struct mp_present *present, struct vo_vsync_info *info);
+
+// Called after every buffer swap to update presentation statistics.
+void present_sync_swap(struct mp_present *present);
+
+// Called anytime the backend delivers new ust/msc values.
+void present_sync_update_values(struct mp_present *present, int64_t ust,
+                                int64_t msc);
+
+#endif /* MP_PRESENT_SYNC_H */