diff options
Diffstat (limited to 'video/out/vo.h')
| -rw-r--r-- | video/out/vo.h | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/video/out/vo.h b/video/out/vo.h index 848f71e472..f64d94a5ba 100644 --- a/video/out/vo.h +++ b/video/out/vo.h @@ -263,6 +263,21 @@ struct vo_frame { uint64_t frame_id; }; +// Presentation feedback. +struct vo_vsync_info { + // Last mp_time_us() timestamp at which a frame was queued. + int64_t last_queue_time; + + // The latency at which swap_buffers() is performed. This is in seconds, and + // valid values are always >= 0. Essentially, it's the predicted time the + // last shown frame will take until it is actually displayed on the physical + // screen. (A reasonable implementation is returning the actual measured + // value for the last frame which was actually displayed. The assumption is + // that the latency usually doesn't change.) + // -1 if unset or unsupported. + double latency; +}; + struct vo_driver { // Encoding functionality, which can be invoked via --o only. bool encode; @@ -375,9 +390,11 @@ struct vo_driver { void (*flip_page)(struct vo *vo); /* - * See struct ra_swapchain. Optional. + * Return presentation feedback. The implementation should not touch fields + * it doesn't support; the info fields are preinitialized to neutral values. + * Usually called once after flip_page(), but can be called any time. */ - double (*get_latency)(struct vo *vo); + void (*get_vsync)(struct vo *vo, struct vo_vsync_info *info); /* These optional callbacks can be provided if the GUI framework used by * the VO requires entering a message loop for receiving events and does |