core: add support for precise non-keyframe-limited seeks

Add support for seeking to an arbitrary non-keyframe position by
decoding video starting from the previous keyframe. Whether to use
this functionality when seeking is controlled by the new option
-hr-seek and a new third argument to the "seek" command. The default
is to use it for absolute seeks (like chapter seeks) but not for
relative ones. Because there's currently no support for cutting
encoded audio some desync is expected if encoded audio passthrough is
used. Currently precise seeks always go to the first frame with
timestamp equal to or greater than the target position; there's no
support for "matching or earlier" backwards seeks at frame level.

1 files changed, 1 insertions, 0 deletions

diff --git a/options.h b/options.h
index 66048e77b2..12ac475f9e 100644
--- a/options.h
+++ b/options.h
@@ -47,6 +47,7 @@ typedef struct MPOpts {
     int user_correct_pts;
     int user_pts_assoc_mode;
     int initial_audio_sync;
+    int hr_seek;
     int autosync;
     int softsleep;
     int rtc;