options: add secondary-sub-delay

Add --secondary-sub-delay option and decouple --sub-delay from secondary
subtitles. This produces desirable behavior in most cases as secondary
and primary subtitles tracks tend to be timed independently of one
another.

This feature is implemented by turning the sub_delay field in
mp_subtitle_opts into an array of 2 floats. From here the track index is
either passed around or derived when sub_delay is needed. There are some
cases in dec_sub.c where it is possible for dec_sub.order (equivalent to
track index) to be -1. In these cases, sub_delay is inferred as 0.

1 files changed, 1 insertions, 1 deletions

diff --git a/options/options.h b/options/options.h
index aa071b28f6..9f55d5b8b1 100644
--- a/options/options.h
+++ b/options/options.h
@@ -85,7 +85,7 @@ struct mp_subtitle_opts {
     bool sub_visibility;
     bool sec_sub_visibility;
     float sub_pos;
-    float sub_delay;
+    float sub_delay[2];
     float sub_fps;
     float sub_speed;
     bool sub_forced_events_only;