Mention audio in camera documentation

doc/camera.md

@@ -18,6 +18,17 @@ scrcpy --video-source=display --audio-source=mic    # force display AND micropho
 scrcpy --video-source=camera --audio-source=output  # force camera AND device audio output
 ```
 
+Audio can be disabled:
+
+```bash
+# audio not captured at all
+scrcpy --video-source=camera --no-audio
+scrcpy --video-source=camera --no-audio --record=file.mp4
+
+# audio captured and recorded, but not played
+scrcpy --video-source=camera --no-audio-playback --record=file.mp4
+```
+
 
 ## List
 

server/src/main/java/com/genymobile/scrcpy/FakeContext.java

@@ -18,7 +18,7 @@ public final class FakeContext extends MutableContextWrapper {
     }
 
     private FakeContext() {
-        super(Workarounds.retrieveSystemContext());
+        super(null);
     }
 
     @Override

server/src/main/java/com/genymobile/scrcpy/Workarounds.java

@@ -7,7 +7,6 @@ import android.content.AttributionSource;
 import android.content.Context;
 import android.content.ContextWrapper;
 import android.content.pm.ApplicationInfo;
-import android.content.pm.PackageManager;
 import android.media.AudioAttributes;
 import android.media.AudioManager;
 import android.media.AudioRecord;
@@ -31,12 +30,6 @@ public final class Workarounds {
 
     public static void apply(boolean audio, boolean camera) {
         Workarounds.prepareMainLooper();
-        try {
-            fillActivityThread();
-            FakeContext.get();
-        } catch (Exception e) {
-            throw new AssertionError(e);
-        }
 
         boolean mustFillAppInfo = false;
         boolean mustFillBaseContext = false;
@@ -130,22 +123,6 @@ public final class Workarounds {
             ApplicationInfo applicationInfo = new ApplicationInfo();
             applicationInfo.packageName = FakeContext.PACKAGE_NAME;
 
-            Application application = new Application() {
-                @Override
-                public String getOpPackageName() {
-                    return FakeContext.PACKAGE_NAME;
-                }
-
-                @Override
-                public PackageManager getPackageManager() {
-                    return FakeContext.get().getPackageManager();
-                }
-            };
-
-            Field initialApplicationField = activityThreadClass.getDeclaredField("mInitialApplication");
-            initialApplicationField.setAccessible(true);
-            initialApplicationField.set(activityThread, application);
-
             // appBindData.appInfo = applicationInfo;
             Field appInfoField = appBindDataClass.getDeclaredField("appInfo");
             appInfoField.setAccessible(true);
@@ -329,16 +306,4 @@ public final class Workarounds {
             throw new RuntimeException("Cannot create AudioRecord");
         }
     }
-
-    static Context retrieveSystemContext() {
-        try {
-            Method getSystemContextMethod = activityThreadClass.getDeclaredMethod("getSystemContext");
-            Context ctx = (Context) getSystemContextMethod.invoke(activityThread);
-            Ln.i("===== " + ctx);
-            return ctx;
-        } catch (Exception e) {
-            Ln.e("Cannot retrieve system context", e);
-            return null;
-        }
-    }
 }