[vlc-commits] [Git][videolan/vlc][master] misc: emscripten: add an inhibit module

[François Cartegnie (@fcartegnie)]

François Cartegnie pushed to branch master at VideoLAN / VLC


Commits:
57f36117 by Alaric Senat at 2026-09-14T06:30:48+02:00
misc: emscripten: add an inhibit module

- - - - -


2 changed files:

- modules/misc/Makefile.am
- + modules/misc/inhibit/emscripten.c


Changes:

=====================================
modules/misc/Makefile.am
=====================================
@@ -52,6 +52,12 @@ libsecuretransport_plugin_la_LDFLAGS = $(AM_LDFLAGS) $(misc_RPATH) -Wl,-framewor
 misc_PLUGINS += libsecuretransport_plugin.la
 endif
 
+
+libemscripten_inhibit_plugin_la_SOURCES = misc/inhibit/emscripten.c
+if HAVE_EMSCRIPTEN
+misc_PLUGINS += libemscripten_inhibit_plugin.la
+endif
+
 if HAVE_OSX
 libiokit_inhibit_plugin_la_SOURCES = misc/inhibit/iokit-inhibit.c
 libiokit_inhibit_plugin_la_LDFLAGS = $(AM_LDFLAGS) -Wl,-framework,CoreFoundation,-framework,IOKit


=====================================
modules/misc/inhibit/emscripten.c
=====================================
@@ -0,0 +1,108 @@
+/*****************************************************************************
+ * emscripten.c: Web browser power management inhibition
+ *****************************************************************************
+ * Copyright (c) 2025-2026 Videolabs
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <assert.h>
+#include <stdint.h>
+
+#include <vlc_common.h>
+
+#include <vlc_inhibit.h>
+#include <vlc_plugin.h>
+
+#include <emscripten.h>
+
+struct vlc_inhibit_sys
+{
+    uint32_t id;
+};
+
+static void Inhibit(vlc_inhibit_t *ih, unsigned flags)
+{
+    vlc_inhibit_sys_t *sys = ih->p_sys;
+
+    if (flags == VLC_INHIBIT_AUDIO)
+        return;
+
+    const bool inhibit = (flags == VLC_INHIBIT_VIDEO);
+    if (inhibit)
+    {
+        MAIN_THREAD_EM_ASM({
+            const index = $0;
+            navigator.wakeLock.request("screen")
+                .then(lock => { Module.wakeLocks[index] = lock; })
+                .catch(err => {
+                    console.error(`WakeLocks are unavailable: ${err.message}`);
+                    Module.wakeLocks[index] = undefined;
+                });
+        }, sys->id);
+    }
+    else
+    {
+        MAIN_THREAD_EM_ASM({
+            const index = $0;
+            const lock = Module.wakeLocks.at(index);
+            if (lock !== undefined)
+                lock.release().then(() => { Module.wakeLocks[index] = undefined; });
+            else
+                console.error(`WakeLock ${index} invalid`);
+        }, sys->id);
+    }
+}
+
+static int Open(vlc_object_t *obj)
+{
+    vlc_inhibit_t *ih = (vlc_inhibit_t *)obj;
+
+    vlc_inhibit_sys_t *sys = malloc(sizeof(*sys));
+    if (unlikely(sys == NULL))
+        return (-ENOMEM);
+
+    sys->id = MAIN_THREAD_EM_ASM_INT({
+        if (Module.wakeLocks === undefined)
+            Module.wakeLocks = new Array();
+
+        const id = Module.wakeLocks.length;
+        Module.wakeLocks.push(undefined);
+        return id;
+    });
+
+    ih->inhibit = Inhibit;
+    ih->p_sys = sys;
+
+    return 0;
+}
+
+static void Close(vlc_object_t *obj)
+{
+    vlc_inhibit_t *ih = (vlc_inhibit_t *)obj;
+    free(ih->p_sys);
+}
+
+vlc_module_begin()
+    set_shortname(N_("Emscripten screensaver"))
+    set_description(N_("Web browser screen saver inhibition"))
+    set_subcategory(SUBCAT_ADVANCED_MISC)
+    set_capability("inhibit", 10)
+    set_callbacks(Open, Close)
+vlc_module_end()



View it on GitLab: https://code.videolan.org/videolan/vlc/-/commit/57f36117ede8fd57abd1e82c276a367b172b0356

-- 
View it on GitLab: https://code.videolan.org/videolan/vlc/-/commit/57f36117ede8fd57abd1e82c276a367b172b0356
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