player: add --chapters-file option

Note that you can't pass .cue or .edl files to it, at least not yet.

Requested in context of allowing to specify custom chapters. For that
to work well, we probably need to add some sort of chapter metadata
pseudo-demuxer.

4 files changed, 32 insertions, 5 deletions

diff --git a/DOCS/man/options.rst b/DOCS/man/options.rst
index ee84169609..440647f448 100644
--- a/DOCS/man/options.rst
+++ b/DOCS/man/options.rst
@@ -247,6 +247,10 @@ Playback Control
     Note: a playlist can be as simple as a text file containing filenames
     separated by newlines.
 
+``--chapters-file=<filename>``
+    Load chapters from this file, instead of using the chapter metadata found
+    in the main file.
+
 ``--sstep=<sec>``
     Skip <sec> seconds after every frame.
 
diff --git a/options/options.c b/options/options.c
index 473e04f56e..ef1a383450 100644
--- a/options/options.c
+++ b/options/options.c
@@ -497,6 +497,8 @@ const m_option_t mp_opts[] = {
 
     OPT_DOUBLE("chapter-seek-threshold", chapter_seek_threshold, 0),
 
+    OPT_STRING("chapters-file", chapter_file, M_OPT_FILE),
+
     OPT_FLAG("load-unsafe-playlists", load_unsafe_playlists, 0),
     OPT_FLAG("merge-files", merge_files, 0),
 
diff --git a/options/options.h b/options/options.h
index d9065c1877..9dddf9b94e 100644
--- a/options/options.h
+++ b/options/options.h
@@ -118,6 +118,7 @@ typedef struct MPOpts {
     char *ordered_chapters_files;
     int chapter_merge_threshold;
     double chapter_seek_threshold;
+    char *chapter_file;
     int load_unsafe_playlists;
     int merge_files;
     int quiet;
diff --git a/player/loadfile.c b/player/loadfile.c
index c4ddf51cc5..a7905a8a36 100644
--- a/player/loadfile.c
+++ b/player/loadfile.c
@@ -779,20 +779,40 @@ static void print_timeline(struct MPContext *mpctx)
 
 static void load_chapters(struct MPContext *mpctx)
 {
-    if (!mpctx->chapters && mpctx->master_demuxer &&
-        mpctx->master_demuxer->num_chapters)
-    {
-        int count = mpctx->master_demuxer->num_chapters;
+    struct demuxer *src = mpctx->master_demuxer;
+    bool free_src = false;
+    char *chapter_file = mpctx->opts->chapter_file;
+    if (chapter_file && chapter_file[0]) {
+        struct stream *stream = stream_create(chapter_file, STREAM_READ,
+                                        mpctx->playback_abort, mpctx->global);
+        if (stream) {
+            struct demuxer *demux = demux_open(stream, NULL, NULL, mpctx->global);
+            if (demux) {
+                src = demux;
+                free_src = true;
+            }
+        }
+        talloc_free(mpctx->chapters);
+        mpctx->chapters = NULL;
+    }
+    if (src && !mpctx->chapters) {
+        talloc_free(mpctx->chapters);
+        int count = src->num_chapters;
         mpctx->chapters = talloc_array(NULL, struct chapter, count);
         mpctx->num_chapters = count;
         for (int n = 0; n < count; n++) {
-            struct demux_chapter *dchapter = &mpctx->master_demuxer->chapters[n];
+            struct demux_chapter *dchapter = &src->chapters[n];
             mpctx->chapters[n] = (struct chapter){
                 .start = dchapter->start / 1e9,
                 .name = talloc_strdup(mpctx->chapters, dchapter->name),
             };
         }
     }
+    if (free_src) {
+        struct stream *s = src->stream;
+        free_demuxer(src);
+        free_stream(s);
+    }
 }
 
 static void load_per_file_options(m_config_t *conf,