1 files changed, 244 insertions, 0 deletions
diff --git a/chromium/third_party/libjingle/source/talk/app/webrtc/objc/RTCEAGLVideoView.m b/chromium/third_party/libjingle/source/talk/app/webrtc/objc/RTCEAGLVideoView.m
new file mode 100644
index 00000000000..5365d9821df
--- /dev/null
+++ b/chromium/third_party/libjingle/source/talk/app/webrtc/objc/RTCEAGLVideoView.m
@@ -0,0 +1,244 @@
+/*
+ * libjingle
+ * Copyright 2014, Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+#import "RTCEAGLVideoView+Internal.h"
+
+#import <GLKit/GLKit.h>
+
+#import "RTCOpenGLVideoRenderer.h"
+#import "RTCVideoRenderer.h"
+#import "RTCVideoTrack.h"
+
+// RTCDisplayLinkTimer wraps a CADisplayLink and is set to fire every two screen
+// refreshes, which should be 30fps. We wrap the display link in order to avoid
+// a retain cycle since CADisplayLink takes a strong reference onto its target.
+// The timer is paused by default.
+@interface RTCDisplayLinkTimer : NSObject
+
+@property(nonatomic) BOOL isPaused;
+
+- (instancetype)initWithTimerHandler:(void (^)(void))timerHandler;
+- (void)invalidate;
+
+@end
+
+@implementation RTCDisplayLinkTimer {
+  CADisplayLink* _displayLink;
+  void (^_timerHandler)(void);
+}
+
+- (instancetype)initWithTimerHandler:(void (^)(void))timerHandler {
+  NSParameterAssert(timerHandler);
+  if (self = [super init]) {
+    _timerHandler = timerHandler;
+    _displayLink =
+        [CADisplayLink displayLinkWithTarget:self
+                                    selector:@selector(displayLinkDidFire:)];
+    _displayLink.paused = YES;
+    // Set to half of screen refresh, which should be 30fps.
+    [_displayLink setFrameInterval:2];
+    [_displayLink addToRunLoop:[NSRunLoop currentRunLoop]
+                       forMode:NSRunLoopCommonModes];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  [self invalidate];
+}
+
+- (BOOL)isPaused {
+  return _displayLink.paused;
+}
+
+- (void)setIsPaused:(BOOL)isPaused {
+  _displayLink.paused = isPaused;
+}
+
+- (void)invalidate {
+  [_displayLink invalidate];
+}
+
+- (void)displayLinkDidFire:(CADisplayLink*)displayLink {
+  _timerHandler();
+}
+
+@end
+
+@interface RTCEAGLVideoView () <GLKViewDelegate>
+// |i420Frame| is set when we receive a frame from a worker thread and is read
+// from the display link callback so atomicity is required.
+@property(atomic, strong) RTCI420Frame* i420Frame;
+@property(nonatomic, readonly) GLKView* glkView;
+@property(nonatomic, readonly) RTCOpenGLVideoRenderer* glRenderer;
+@end
+
+@implementation RTCEAGLVideoView {
+  RTCDisplayLinkTimer* _timer;
+  GLKView* _glkView;
+  RTCOpenGLVideoRenderer* _glRenderer;
+  RTCVideoRenderer* _videoRenderer;
+}
+
+- (instancetype)initWithFrame:(CGRect)frame {
+  if (self = [super initWithFrame:frame]) {
+    EAGLContext* glContext =
+        [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
+    _glRenderer = [[RTCOpenGLVideoRenderer alloc] initWithContext:glContext];
+
+    // GLKView manages a framebuffer for us.
+    _glkView = [[GLKView alloc] initWithFrame:CGRectZero
+                                      context:glContext];
+    _glkView.drawableColorFormat = GLKViewDrawableColorFormatRGBA8888;
+    _glkView.drawableDepthFormat = GLKViewDrawableDepthFormatNone;
+    _glkView.drawableStencilFormat = GLKViewDrawableStencilFormatNone;
+    _glkView.drawableMultisample = GLKViewDrawableMultisampleNone;
+    _glkView.delegate = self;
+    _glkView.layer.masksToBounds = YES;
+    [self addSubview:_glkView];
+
+    // Listen to application state in order to clean up OpenGL before app goes
+    // away.
+    NSNotificationCenter* notificationCenter =
+        [NSNotificationCenter defaultCenter];
+    [notificationCenter addObserver:self
+                           selector:@selector(willResignActive)
+                               name:UIApplicationWillResignActiveNotification
+                             object:nil];
+    [notificationCenter addObserver:self
+                           selector:@selector(didBecomeActive)
+                               name:UIApplicationDidBecomeActiveNotification
+                             object:nil];
+
+    // Frames are received on a separate thread, so we poll for current frame
+    // using a refresh rate proportional to screen refresh frequency. This
+    // occurs on the main thread.
+    __weak RTCEAGLVideoView* weakSelf = self;
+    _timer = [[RTCDisplayLinkTimer alloc] initWithTimerHandler:^{
+      RTCEAGLVideoView* strongSelf = weakSelf;
+      // Don't render if frame hasn't changed.
+      if (strongSelf.glRenderer.lastDrawnFrame == strongSelf.i420Frame) {
+        return;
+      }
+      // This tells the GLKView that it's dirty, which will then call the
+      // GLKViewDelegate method implemented below.
+      [strongSelf.glkView setNeedsDisplay];
+    }];
+    _videoRenderer = [[RTCVideoRenderer alloc] initWithDelegate:self];
+    [self setupGL];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  [[NSNotificationCenter defaultCenter] removeObserver:self];
+  UIApplicationState appState =
+      [UIApplication sharedApplication].applicationState;
+  if (appState == UIApplicationStateActive) {
+    [self teardownGL];
+  }
+  [_timer invalidate];
+}
+
+- (void)setVideoTrack:(RTCVideoTrack*)videoTrack {
+  if (_videoTrack == videoTrack) {
+    return;
+  }
+  [_videoTrack removeRenderer:_videoRenderer];
+  _videoTrack = videoTrack;
+  [_videoTrack addRenderer:_videoRenderer];
+  // TODO(tkchin): potentially handle changes in track state - e.g. render
+  // black if track fails.
+}
+
+#pragma mark - UIView
+
+- (void)layoutSubviews {
+  [super layoutSubviews];
+  _glkView.frame = self.bounds;
+}
+
+#pragma mark - GLKViewDelegate
+
+// This method is called when the GLKView's content is dirty and needs to be
+// redrawn. This occurs on main thread.
+- (void)glkView:(GLKView*)view drawInRect:(CGRect)rect {
+  if (self.i420Frame) {
+    // The renderer will draw the frame to the framebuffer corresponding to the
+    // one used by |view|.
+    [_glRenderer drawFrame:self.i420Frame];
+  }
+}
+
+#pragma mark - Private
+
+- (void)setupGL {
+  [_glRenderer setupGL];
+  _timer.isPaused = NO;
+}
+
+- (void)teardownGL {
+  _timer.isPaused = YES;
+  [_glkView deleteDrawable];
+  [_glRenderer teardownGL];
+}
+
+- (void)didBecomeActive {
+  [self setupGL];
+}
+
+- (void)willResignActive {
+  [self teardownGL];
+}
+
+@end
+
+@implementation RTCEAGLVideoView (Internal)
+
+#pragma mark - RTCVideoRendererDelegate
+
+// These methods are called when the video track has frame information to
+// provide. This occurs on non-main thread.
+- (void)renderer:(RTCVideoRenderer*)renderer
+      didSetSize:(CGSize)size {
+  __weak RTCEAGLVideoView* weakSelf = self;
+  dispatch_async(dispatch_get_main_queue(), ^{
+    RTCEAGLVideoView* strongSelf = weakSelf;
+    [strongSelf.delegate videoView:strongSelf didChangeVideoSize:size];
+  });
+}
+
+- (void)renderer:(RTCVideoRenderer*)renderer
+    didReceiveFrame:(RTCI420Frame*)frame {
+  self.i420Frame = frame;
+}
+
+@end