win32: add Media Control support

Add support for SystemMediaTransportControls interface. This allows to
control mpv from Windows media control ui.

DOCS/interface-changes/media-controls.txt

@@ -0,0 +1 @@
+add `--media-controls` option

DOCS/man/options.rst

@@ -7420,6 +7420,13 @@ Miscellaneous
 
     .. warning:: Using realtime priority can cause system lockup.
 
+``--media-controls=<yes|player|no>``
+    (Windows only)
+    Enable integration of media control interface SystemMediaTransportControls.
+    If set to ``player``, only the player will use the controls. Setting it to
+    ``yes`` will also enable the controls for libmpv integrations.
+    (default: ``player``)
+
 ``--force-media-title=<string>``
     Force the contents of the ``media-title`` property to this value. Useful
     for scripts which want to set a title, without overriding the user's

meson.build

@@ -530,6 +530,10 @@ if not posix and not features['win32-desktop']
                      'osdep/terminal-dummy.c')
 endif
 
+if win32
+    subdir('osdep/win32')
+endif
+
 features += {'glob-posix': cc.has_function('glob', prefix: '#include <glob.h>')}
 
 features += {'glob-win32': win32 and not features['glob-posix']}

meson_options.txt

@@ -116,6 +116,9 @@ option('macos-touchbar', type: 'feature', value: 'auto', description: 'macOS Tou
 option('swift-build', type: 'feature', value: 'auto', description: 'macOS Swift build tools')
 option('swift-flags', type: 'string', description: 'Optional Swift compiler flags')
 
+# Windows features
+option('win32-smtc', type: 'feature', value: 'auto', description: 'Enable Media Control support')
+
 # manpages
 option('html-build', type: 'feature', value: 'disabled', description: 'HTML manual generation')
 option('manpage-build', type: 'feature', value: 'auto', description: 'manpage generation')

misc/path_utils.c

@@ -156,6 +156,8 @@ char *mp_getcwd(void *talloc_ctx)
 
 char *mp_normalize_path(void *talloc_ctx, const char *path)
 {
+    assert(talloc_ctx && "mp_normalize_path requires talloc_ctx!");
+
     if (!path)
         return NULL;
 

options/options.c

@@ -543,6 +543,8 @@ static const m_option_t mp_opts[] = {
         {"idle",        IDLE_PRIORITY_CLASS}),
         .flags = UPDATE_PRIORITY},
 #endif
+    {"media-controls", OPT_CHOICE(media_controls,
+        {"no", 0}, {"player", 1}, {"yes", 2})},
     {"config", OPT_BOOL(load_config), .flags = CONF_PRE_PARSE},
     {"config-dir", OPT_STRING(force_configdir),
         .flags = CONF_NOCFG | CONF_PRE_PARSE | M_OPT_FILE},
@@ -1039,6 +1041,7 @@ static const struct MPOpts mp_default_opts = {
     .osd_bar_visible = true,
     .screenshot_template = "mpv-shot%n",
     .play_dir = 1,
+    .media_controls = 1,
 
     .audiofile_auto_exts = (char *[]){
         "aac",

options/options.h

@@ -344,6 +344,7 @@ typedef struct MPOpts {
     bool osd_bar_visible;
 
     int w32_priority;
+    int media_controls;
 
     struct bluray_opts *stream_bluray_opts;
     struct cdda_opts *stream_cdda_opts;

osdep/win32/meson.build

@@ -0,0 +1,8 @@
+add_languages('cpp', native: false)
+cpp = meson.get_compiler('cpp')
+
+features += {'win32-smtc': cpp.has_header('winrt/base.h', required: get_option('win32-smtc'))}
+if features['win32-smtc']
+    dependencies += cpp.find_library('runtimeobject')
+    sources += meson.current_source_dir() / 'smtc.cpp'
+endif