From 5841685e09dd1ae92de6adf20f3dc1f23fcda750 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Sun, 18 May 2014 00:03:47 +0200
Subject: command: add a disc-menu-active property

Returns whether a DVD/BD menu is active. As requested by #788.
---
 DOCS/man/en/input.rst |  6 ++++++
 player/command.c      | 11 +++++++++++
 player/core.h         |  1 +
 player/discnav.c      | 18 ++++++++++++++++++
 4 files changed, 36 insertions(+)

diff --git a/DOCS/man/en/input.rst b/DOCS/man/en/input.rst
index c7ddf3dfd7..122fc679ec 100644
--- a/DOCS/man/en/input.rst
+++ b/DOCS/man/en/input.rst
@@ -661,6 +661,12 @@ Property list
     Current BD/DVD title number. Writing works only for ``dvdnav://`` and
     ``bd://`` (and aliases for these).
 
+``disc-menu-active``
+    Return ``yes`` if the BD/DVD menu is active, or ``no`` on normal video
+    playback. The property is unavailable when playing something that is not
+    a BD or DVD. Use the ``discnav menu`` command to actually enter or leave
+    menu mode.
+
 ``chapters``
     Number of chapters.
 
diff --git a/player/command.c b/player/command.c
index 512f2b478a..fd0f589053 100644
--- a/player/command.c
+++ b/player/command.c
@@ -512,6 +512,15 @@ static int mp_property_disc_title(m_option_t *prop, int action, void *arg,
     }
 }
 
+static int mp_property_disc_menu(m_option_t *prop, int action, void *arg,
+                                 MPContext *mpctx)
+{
+    int state = mp_nav_in_menu(mpctx);
+    if (state < 0)
+        return M_PROPERTY_UNAVAILABLE;
+    return m_property_int_ro(prop, action, arg, !!state);
+}
+
 /// Current chapter (RW)
 static int mp_property_chapter(m_option_t *prop, int action, void *arg,
                                MPContext *mpctx)
@@ -2359,6 +2368,8 @@ static const m_option_t mp_properties[] = {
     { "time-remaining", mp_property_remaining, CONF_TYPE_TIME },
     { "playtime-remaining", mp_property_playtime_remaining, CONF_TYPE_TIME },
     { "disc-title", mp_property_disc_title, CONF_TYPE_INT, M_OPT_MIN, -1, 0, NULL },
+    { "disc-menu-active", mp_property_disc_menu,  CONF_TYPE_FLAG,
+      M_OPT_RANGE, 0, 1, NULL },
     { "chapter", mp_property_chapter, CONF_TYPE_INT,
       M_OPT_MIN, -1, 0, NULL },
     M_OPTION_PROPERTY_CUSTOM("edition", mp_property_edition),
diff --git a/player/core.h b/player/core.h
index 891c14792d..b107edc7e4 100644
--- a/player/core.h
+++ b/player/core.h
@@ -375,6 +375,7 @@ void mp_nav_reset(struct MPContext *mpctx);
 void mp_nav_destroy(struct MPContext *mpctx);
 void mp_nav_user_input(struct MPContext *mpctx, char *command);
 void mp_handle_nav(struct MPContext *mpctx);
+int mp_nav_in_menu(struct MPContext *mpctx);
 
 // loadfile.c
 void uninit_player(struct MPContext *mpctx, unsigned int mask);
diff --git a/player/discnav.c b/player/discnav.c
index 990f882d87..60b83bcd3c 100644
--- a/player/discnav.c
+++ b/player/discnav.c
@@ -19,6 +19,7 @@
 #include <assert.h>
 
 #include "core.h"
+#include "command.h"
 
 #include "common/msg.h"
 #include "common/common.h"
@@ -69,6 +70,18 @@ static void update_resolution(struct MPContext *mpctx) {
     }
 }
 
+// Send update events and such.
+static void update_state(struct MPContext *mpctx)
+{
+    mp_notify_property(mpctx, "disc-menu-active");
+}
+
+// Return 1 if in menu, 0 if in video, or <0 if no navigation possible.
+int mp_nav_in_menu(struct MPContext *mpctx)
+{
+    return mpctx->nav_state ? mpctx->nav_state->nav_menu : -1;
+}
+
 // Allocate state and enable navigation features. Must happen before
 // initializing cache, because the cache would read data. Since stream_dvdnav is
 // in a mode which skips all transitions on reading data (before enabling
@@ -93,6 +106,8 @@ void mp_nav_init(struct MPContext *mpctx)
     mp_input_enable_section(mpctx->input, "discnav", 0);
     mp_input_set_section_mouse_area(mpctx->input, "discnav-menu",
                                     INT_MIN, INT_MIN, INT_MAX, INT_MAX);
+
+    update_state(mpctx);
 }
 
 void mp_nav_reset(struct MPContext *mpctx)
@@ -111,6 +126,7 @@ void mp_nav_reset(struct MPContext *mpctx)
     // Prevent demuxer init code to seek to the "start"
     mpctx->stream->start_pos = stream_tell(mpctx->stream);
     stream_control(mpctx->stream, STREAM_CTRL_RESUME_CACHE, NULL);
+    update_state(mpctx);
 }
 
 void mp_nav_destroy(struct MPContext *mpctx)
@@ -122,6 +138,7 @@ void mp_nav_destroy(struct MPContext *mpctx)
     mp_input_disable_section(mpctx->input, "discnav-menu");
     talloc_free(mpctx->nav_state);
     mpctx->nav_state = NULL;
+    update_state(mpctx);
 }
 
 void mp_nav_user_input(struct MPContext *mpctx, char *command)
@@ -193,6 +210,7 @@ void mp_handle_nav(struct MPContext *mpctx)
             } else {
                 mp_input_disable_section(mpctx->input, "discnav-menu");
             }
+            update_state(mpctx);
             break;
         case MP_NAV_EVENT_HIGHLIGHT: {
             MP_VERBOSE(nav, "highlight: %d %d %d - %d %d\n",
-- 
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