From 49f5c9b4820b082b8d25b753ff010562939a754f Mon Sep 17 00:00:00 2001
From: wnoun <wnoun@outlook.com>
Date: Thu, 16 Apr 2020 18:03:18 +0800
Subject: [PATCH] command: add property track-list/N/main-selection

---
 DOCS/man/input.rst |  7 +++++++
 player/command.c   | 11 +++++++++++
 2 files changed, 18 insertions(+)

diff --git a/DOCS/man/input.rst b/DOCS/man/input.rst
index 2b2ad76719..23725d97ec 100644
--- a/DOCS/man/input.rst
+++ b/DOCS/man/input.rst
@@ -2720,6 +2720,12 @@ Property list
     ``track-list/N/selected``
         ``yes`` if the track is currently decoded, ``no`` otherwise.
 
+    ``track-list/N/main-selection``
+        It indicates the selection order of tracks for the same type.
+        If a track is not selected, or is selected by the ``--lavfi-complex``,
+        it is not available. For subtitle tracks, ``0`` represents the ``sid``,
+        and ``1`` represents the ``secondary-sid``.
+
     ``track-list/N/ff-index``
         The stream index as usually used by the FFmpeg utilities. Note that
         this can be potentially wrong if a demuxer other than libavformat
@@ -2786,6 +2792,7 @@ Property list
                 "default"           MPV_FORMAT_FLAG
                 "forced"            MPV_FORMAT_FLAG
                 "selected"          MPV_FORMAT_FLAG
+                "main-selection"    MPV_FORMAT_INT64
                 "external"          MPV_FORMAT_FLAG
                 "external-filename" MPV_FORMAT_STRING
                 "codec"             MPV_FORMAT_STRING
diff --git a/player/command.c b/player/command.c
index 572d0874d0..b0753b690a 100644
--- a/player/command.c
+++ b/player/command.c
@@ -1919,6 +1919,16 @@ static int get_track_entry(int item, int action, void *arg, void *ctx)
     if (p.par_h)
         par = p.par_w / (double) p.par_h;
 
+    int order = -1;
+    if (track->selected) {
+        for (int i = 0; i < num_ptracks[track->type]; i++) {
+            if (mpctx->current_track[i][track->type] == track) {
+                order = i;
+                break;
+            }
+        }
+    }
+
     struct m_sub_property props[] = {
         {"id",          SUB_PROP_INT(track->user_tid)},
         {"type",        SUB_PROP_STR(stream_type_name(track->type)),
@@ -1939,6 +1949,7 @@ static int get_track_entry(int item, int action, void *arg, void *ctx)
         {"hearing-impaired", SUB_PROP_FLAG(track->hearing_impaired_track)},
         {"external",    SUB_PROP_FLAG(track->is_external)},
         {"selected",    SUB_PROP_FLAG(track->selected)},
+        {"main-selection", SUB_PROP_INT(order), .unavailable = order < 0},
         {"external-filename", SUB_PROP_STR(track->external_filename),
                         .unavailable = !track->external_filename},
         {"ff-index",    SUB_PROP_INT(track->ff_index)},