From 77cfca739d79e679522ccb87ba2efcba077081c7 Mon Sep 17 00:00:00 2001
From: wuggy <ownedbywuigi@gmail.com>
Date: Wed, 9 Sep 2026 05:34:07 -0700
Subject: [PATCH] Add DirectShow in about:support

---
 dom/media/directshow/DirectShowReader.cpp              |  9 ++++++++-
 modules/libpref/init/all.js                            |  1 +
 toolkit/content/aboutSupport.js                        | 10 ++++++++++
 .../en-US/chrome/global/aboutSupport.properties        |  2 ++
 toolkit/modules/Troubleshoot.jsm                       |  3 ++-
 5 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/dom/media/directshow/DirectShowReader.cpp b/dom/media/directshow/DirectShowReader.cpp
index 1e3a2cceed..cc7278146e 100644
--- a/dom/media/directshow/DirectShowReader.cpp
+++ b/dom/media/directshow/DirectShowReader.cpp
@@ -12,6 +12,7 @@
 #include "SourceFilter.h"
 #include "SampleSink.h"
 #include "VideoUtils.h"
+#include "mozilla/Preferences.h"
 
 using namespace mozilla::media;
 
@@ -35,16 +36,22 @@ DirectShowReader::DirectShowReader(AbstractMediaDecoder* aDecoder)
     mAudioRate(0),
     mBytesPerSample(0),
     mIsH264(aDecoder->GetResource()->GetContentType().EqualsLiteral("video/h264") ||
-            aDecoder->GetResource()->GetContentType().EqualsLiteral("video/avc"))
+             aDecoder->GetResource()->GetContentType().EqualsLiteral("video/avc"))
 {
   MOZ_ASSERT(NS_IsMainThread(), "Must be on main thread.");
   MOZ_COUNT_CTOR(DirectShowReader);
+  if (mIsH264) {
+    Preferences::SetBool("media.directshow.h264.active", true);
+  }
 }
 
 DirectShowReader::~DirectShowReader()
 {
   MOZ_ASSERT(NS_IsMainThread(), "Must be on main thread.");
   MOZ_COUNT_DTOR(DirectShowReader);
+  if (mIsH264) {
+    Preferences::SetBool("media.directshow.h264.active", false);
+  }
 #ifdef DIRECTSHOW_REGISTER_GRAPH
   if (mRotRegister) {
     RemoveGraphFromRunningObjectTable(mRotRegister);
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 5ed5c3b0e9..5e124ff937 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -394,6 +394,7 @@ pref("media.hardware-video-decoding.force-enabled", false);
 
 #ifdef MOZ_DIRECTSHOW
 pref("media.directshow.enabled", true);
+pref("media.directshow.h264.active", false);
 #endif
 
 #ifdef MOZ_FMP4
diff --git a/toolkit/content/aboutSupport.js b/toolkit/content/aboutSupport.js
index 9684e80ba7..a1825c7cad 100644
--- a/toolkit/content/aboutSupport.js
+++ b/toolkit/content/aboutSupport.js
@@ -337,6 +337,16 @@ var snapshotFormatters = {
     addRowFromKey("features", "webgl2Extensions");
     addRowFromKey("features", "supportsHardwareH264", "hardwareH264");
     addRowFromKey("features", "currentAudioBackend", "audioBackend");
+    if ("directShowEnabled" in data) {
+      addRow("features", "directShowEnabled",
+             strings.GetStringFromName(data.directShowEnabled ? "yes" : "no"));
+      delete data.directShowEnabled;
+    }
+    if ("directShowH264Active" in data) {
+      addRow("features", "directShowH264Active",
+             strings.GetStringFromName(data.directShowH264Active ? "yes" : "no"));
+      delete data.directShowH264Active;
+    }
     addRowFromKey("features", "direct2DEnabled", "#Direct2D");
 
     if ("directWriteEnabled" in data) {
diff --git a/toolkit/locales/en-US/chrome/global/aboutSupport.properties b/toolkit/locales/en-US/chrome/global/aboutSupport.properties
index b452514158..629651d81f 100644
--- a/toolkit/locales/en-US/chrome/global/aboutSupport.properties
+++ b/toolkit/locales/en-US/chrome/global/aboutSupport.properties
@@ -60,6 +60,8 @@ clearTypeParameters = ClearType Parameters
 compositing = Compositing
 hardwareH264 = Hardware H264 Decoding
 audioBackend = Audio Backend
+directShowEnabled = DirectShow H264 Backend Enabled
+directShowH264Active = DirectShow H264 Decoding Active
 mainThreadNoOMTC = main thread, no OMTC
 yes = Yes
 no = No
diff --git a/toolkit/modules/Troubleshoot.jsm b/toolkit/modules/Troubleshoot.jsm
index c25cbce433..1cf7333ed5 100644
--- a/toolkit/modules/Troubleshoot.jsm
+++ b/toolkit/modules/Troubleshoot.jsm
@@ -358,6 +358,8 @@ var dataProviders = {
     } catch (e) {}
 
     data.currentAudioBackend = winUtils.currentAudioBackend;
+    data.directShowEnabled = Services.prefs.getBoolPref("media.directshow.enabled", false);
+    data.directShowH264Active = Services.prefs.getBoolPref("media.directshow.h264.active", false);
 
     if (!data.numAcceleratedWindows && gfxInfo) {
 #ifdef XP_WIN
@@ -551,4 +553,3 @@ var dataProviders = {
     });
   }
 };
-