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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.mozilla.thirdparty.com.google.android.exoplayer2.video;
import static org.mozilla.thirdparty.com.google.android.exoplayer2.util.EGLSurfaceTexture.SECURE_MODE_NONE;
import static org.mozilla.thirdparty.com.google.android.exoplayer2.util.EGLSurfaceTexture.SECURE_MODE_PROTECTED_PBUFFER;
import static org.mozilla.thirdparty.com.google.android.exoplayer2.util.EGLSurfaceTexture.SECURE_MODE_SURFACELESS_CONTEXT;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.SurfaceTexture;
import android.os.Handler;
import android.os.Handler.Callback;
import android.os.HandlerThread;
import android.os.Message;
import android.view.Surface;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.EGLSurfaceTexture;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.EGLSurfaceTexture.SecureMode;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.GlUtil;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Log;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
/** A dummy {@link Surface}. */
@TargetApi(17)
public final class DummySurface extends Surface {
private static final String TAG = "DummySurface";
/**
* Whether the surface is secure.
*/
public final boolean secure;
private static @SecureMode int secureMode;
private static boolean secureModeInitialized;
private final DummySurfaceThread thread;
private boolean threadReleased;
/**
* Returns whether the device supports secure dummy surfaces.
*
* @param context Any {@link Context}.
* @return Whether the device supports secure dummy surfaces.
*/
public static synchronized boolean isSecureSupported(Context context) {
if (!secureModeInitialized) {
secureMode = getSecureMode(context);
secureModeInitialized = true;
}
return secureMode != SECURE_MODE_NONE;
}
/**
* Returns a newly created dummy surface. The surface must be released by calling {@link #release}
* when it's no longer required.
* <p>
* Must only be called if {@link Util#SDK_INT} is 17 or higher.
*
* @param context Any {@link Context}.
* @param secure Whether a secure surface is required. Must only be requested if
* {@link #isSecureSupported(Context)} returns {@code true}.
* @throws IllegalStateException If a secure surface is requested on a device for which
* {@link #isSecureSupported(Context)} returns {@code false}.
*/
public static DummySurface newInstanceV17(Context context, boolean secure) {
assertApiLevel17OrHigher();
Assertions.checkState(!secure || isSecureSupported(context));
DummySurfaceThread thread = new DummySurfaceThread();
return thread.init(secure ? secureMode : SECURE_MODE_NONE);
}
private DummySurface(DummySurfaceThread thread, SurfaceTexture surfaceTexture, boolean secure) {
super(surfaceTexture);
this.thread = thread;
this.secure = secure;
}
@Override
public void release() {
super.release();
// The Surface may be released multiple times (explicitly and by Surface.finalize()). The
// implementation of super.release() has its own deduplication logic. Below we need to
// deduplicate ourselves. Synchronization is required as we don't control the thread on which
// Surface.finalize() is called.
synchronized (thread) {
if (!threadReleased) {
thread.release();
threadReleased = true;
}
}
}
private static void assertApiLevel17OrHigher() {
if (Util.SDK_INT < 17) {
throw new UnsupportedOperationException("Unsupported prior to API level 17");
}
}
@SecureMode
private static int getSecureMode(Context context) {
if (GlUtil.isProtectedContentExtensionSupported(context)) {
if (GlUtil.isSurfacelessContextExtensionSupported()) {
return SECURE_MODE_SURFACELESS_CONTEXT;
} else {
// If we can't use surfaceless contexts, we use a protected 1 * 1 pixel buffer surface.
// This may require support for EXT_protected_surface, but in practice it works on some
// devices that don't have that extension. See also
// https://github.com/google/ExoPlayer/issues/3558.
return SECURE_MODE_PROTECTED_PBUFFER;
}
} else {
return SECURE_MODE_NONE;
}
}
private static class DummySurfaceThread extends HandlerThread implements Callback {
private static final int MSG_INIT = 1;
private static final int MSG_RELEASE = 2;
private @MonotonicNonNull EGLSurfaceTexture eglSurfaceTexture;
private @MonotonicNonNull Handler handler;
@Nullable private Error initError;
@Nullable private RuntimeException initException;
@Nullable private DummySurface surface;
public DummySurfaceThread() {
super("dummySurface");
}
public DummySurface init(@SecureMode int secureMode) {
start();
handler = new Handler(getLooper(), /* callback= */ this);
eglSurfaceTexture = new EGLSurfaceTexture(handler);
boolean wasInterrupted = false;
synchronized (this) {
handler.obtainMessage(MSG_INIT, secureMode, 0).sendToTarget();
while (surface == null && initException == null && initError == null) {
try {
wait();
} catch (InterruptedException e) {
wasInterrupted = true;
}
}
}
if (wasInterrupted) {
// Restore the interrupted status.
Thread.currentThread().interrupt();
}
if (initException != null) {
throw initException;
} else if (initError != null) {
throw initError;
} else {
return Assertions.checkNotNull(surface);
}
}
public void release() {
Assertions.checkNotNull(handler);
handler.sendEmptyMessage(MSG_RELEASE);
}
@Override
public boolean handleMessage(Message msg) {
switch (msg.what) {
case MSG_INIT:
try {
initInternal(/* secureMode= */ msg.arg1);
} catch (RuntimeException e) {
Log.e(TAG, "Failed to initialize dummy surface", e);
initException = e;
} catch (Error e) {
Log.e(TAG, "Failed to initialize dummy surface", e);
initError = e;
} finally {
synchronized (this) {
notify();
}
}
return true;
case MSG_RELEASE:
try {
releaseInternal();
} catch (Throwable e) {
Log.e(TAG, "Failed to release dummy surface", e);
} finally {
quit();
}
return true;
default:
return true;
}
}
private void initInternal(@SecureMode int secureMode) {
Assertions.checkNotNull(eglSurfaceTexture);
eglSurfaceTexture.init(secureMode);
this.surface =
new DummySurface(
this, eglSurfaceTexture.getSurfaceTexture(), secureMode != SECURE_MODE_NONE);
}
private void releaseInternal() {
Assertions.checkNotNull(eglSurfaceTexture);
eglSurfaceTexture.release();
}
}
}
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