sub: rewrite auto-forced-only support

- No longer has a fake "option" used only internally (which didn't always get propagated properly)
- Always overrideable during playback

DOCS/man/input.rst

@@ -2865,6 +2865,10 @@ Property list
         ``yes``/true if the track has the forced flag set in the file,
         ``no``/false or unavailable otherwise.
 
+    ``track-list/N/auto-forced-only``
+        ``yes``/true if the track was autoselected in forced-only mode,
+        ``no``/false or unavailable otherwise.
+
     ``track-list/N/codec``
         The codec name used by this track, for example ``h264``. Unavailable
         in some rare cases.

options/options.h

@@ -82,7 +82,6 @@ struct mp_subtitle_opts {
     float sub_fps;
     float sub_speed;
     int forced_subs_only;
-    int forced_subs_only_current;
     bool stretch_dvd_subs;
     bool stretch_image_subs;
     bool image_subs_video_res;

player/core.h

@@ -137,6 +137,7 @@ struct track {
 
     // Current subtitle state (or cached state if selected==false).
     struct dec_sub *d_sub;
+    bool forced_only_def;
 
     // Current decoding state (NULL if selected==false)
     struct mp_decoder_wrapper *dec;

player/loadfile.c

@@ -591,6 +591,7 @@ struct track *select_default_track(struct MPContext *mpctx, int order,
     struct track *forced_pick = NULL;
     for (int n = 0; n < mpctx->num_tracks; n++) {
         struct track *track = mpctx->tracks[n];
+        track->forced_only_def = false;
         if (track->type != type)
             continue;
         if (track->user_tid == tid) {
@@ -639,9 +640,16 @@ struct track *select_default_track(struct MPContext *mpctx, int order,
         pick = NULL;
     if (pick && !opts->autoload_files && pick->is_external)
         pick = NULL;
-    if (pick && type == STREAM_SUB && prefer_forced && !pick->forced_track &&
-        opts->subs_rend->forced_subs_only == -1)
-        opts->subs_rend->forced_subs_only_current = 1;
+    if (pick && type == STREAM_SUB && prefer_forced && !pick->forced_track) {
+        // If the codec is DVD or PGS, we can display it in forced-only mode.
+        // This isn't really meaningful for other codecs, so we'll just pick nothing.
+        if (pick->stream &&
+            !strcmp(pick->stream->codec->codec, "dvd_subtitle") ||
+            !strcmp(pick->stream->codec->codec, "hdmv_pgs_subtitle"))
+            pick->forced_only_def = 1;
+        else
+            pick = NULL;
+    }
 cleanup:
     talloc_free(langs);
     return pick;
@@ -1639,8 +1647,6 @@ static void play_current_file(struct MPContext *mpctx)
     if (reinit_complex_filters(mpctx, false) < 0)
         goto terminate_playback;
 
-    opts->subs_rend->forced_subs_only_current = (opts->subs_rend->forced_subs_only == 1) ? 1 : 0;
-
     for (int t = 0; t < STREAM_TYPE_COUNT; t++) {
         for (int i = 0; i < num_ptracks[t]; i++) {
             struct track *sel = NULL;

player/sub.c

@@ -169,7 +169,7 @@ static bool init_subdec(struct MPContext *mpctx, struct track *track)
     if (!track->demuxer || !track->stream)
         return false;
 
-    track->d_sub = sub_create(mpctx->global, track->stream,
+    track->d_sub = sub_create(mpctx->global, track,
                               get_all_attachments(mpctx),
                               get_order(mpctx, track));
     if (!track->d_sub)

sub/dec_sub.c

@@ -69,6 +69,8 @@ struct dec_sub {
     struct sd *sd;
 
     struct demux_packet *new_segment;
+
+    bool forced_only_def;
 };
 
 static void update_subtitle_speed(struct dec_sub *sub)
@@ -142,6 +144,7 @@ static struct sd *init_decoder(struct dec_sub *sub)
             .attachments = sub->attachments,
             .codec = sub->codec,
             .preload_ok = true,
+            .forced_only_def = sub->forced_only_def,
         };
 
         if (sd->driver->init(sd) >= 0)
@@ -160,18 +163,18 @@ static struct sd *init_decoder(struct dec_sub *sub)
 // do not need to acquire locks.
 // Ownership of attachments goes to the callee, and is released with
 // talloc_free() (even on failure).
-struct dec_sub *sub_create(struct mpv_global *global, struct sh_stream *sh,
+struct dec_sub *sub_create(struct mpv_global *global, struct track *track,
                            struct attachment_list *attachments, int order)
 {
-    assert(sh && sh->type == STREAM_SUB);
+    assert(track->stream && track->stream->type == STREAM_SUB);
 
     struct dec_sub *sub = talloc(NULL, struct dec_sub);
     *sub = (struct dec_sub){
         .log = mp_log_new(sub, global->log, "sub"),
         .global = global,
         .opts_cache = m_config_cache_alloc(sub, global, &mp_subtitle_sub_opts),
-        .sh = sh,
-        .codec = sh->codec,
+        .sh = track->stream,
+        .codec = track->stream->codec,
         .attachments = talloc_steal(sub, attachments),
         .play_dir = 1,
         .order = order,
@@ -179,6 +182,7 @@ struct dec_sub *sub_create(struct mpv_global *global, struct sh_stream *sh,
         .last_vo_pts = MP_NOPTS_VALUE,
         .start = MP_NOPTS_VALUE,
         .end = MP_NOPTS_VALUE,
+        .forced_only_def = track->forced_only_def,
     };
     sub->opts = sub->opts_cache->opts;
     mpthread_mutex_init_recursive(&sub->lock);

sub/dec_sub.h

@@ -4,6 +4,7 @@
 #include <stdbool.h>
 #include <stdint.h>
 
+#include "player/core.h"
 #include "osd.h"
 
 struct sh_stream;
@@ -36,7 +37,7 @@ struct attachment_list {
     int num_entries;
 };
 
-struct dec_sub *sub_create(struct mpv_global *global, struct sh_stream *sh,
+struct dec_sub *sub_create(struct mpv_global *global, struct track *track,
                            struct attachment_list *attachments, int order);
 void sub_destroy(struct dec_sub *sub);
 

sub/sd.h

@@ -24,6 +24,8 @@ struct sd {
     // Set to false as soon as the decoder discards old subtitle events.
     // (only needed if sd_functions.accept_packets_in_advance == false)
     bool preload_ok;
+
+    bool forced_only_def;
 };
 
 struct sd_functions {

sub/sd_ass.c

@@ -543,7 +543,7 @@ static struct sub_bitmaps *get_bitmaps(struct sd *sd, struct mp_osd_res dim,
     // Currently no supported text sub formats support a distinction between forced
     // and unforced lines, so we just assume everything's unforced and discard everything.
     // If we ever see a format that makes this distinction, we can add support here.
-    if (opts->forced_subs_only_current)
+    if (opts->forced_subs_only == 1 || (opts->forced_subs_only && sd->forced_only_def))
         goto done;
 
     double scale = dim.display_par;

sub/sd_lavc.c

@@ -195,7 +195,8 @@ static void read_sub_bitmaps(struct sd *sd, struct sub *sub)
             MP_ERR(sd, "unsupported subtitle type from libavcodec\n");
             continue;
         }
-        if (!(r->flags & AV_SUBTITLE_FLAG_FORCED) && opts->forced_subs_only_current)
+        if (!(r->flags & AV_SUBTITLE_FLAG_FORCED) && (opts->forced_subs_only == 1 ||
+            (opts->forced_subs_only && sd->forced_only_def)))
             continue;
         if (r->w <= 0 || r->h <= 0)
             continue;