1 files changed, 187 insertions, 0 deletions
diff --git a/chromium/third_party/libjingle/source/talk/app/webrtc/objc/RTCNSGLVideoView.m b/chromium/third_party/libjingle/source/talk/app/webrtc/objc/RTCNSGLVideoView.m
new file mode 100644
index 00000000000..39f3678bfad
--- /dev/null
+++ b/chromium/third_party/libjingle/source/talk/app/webrtc/objc/RTCNSGLVideoView.m
@@ -0,0 +1,187 @@
+/*
+ * 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 "RTCNSGLVideoView.h"
+
+#import <CoreVideo/CVDisplayLink.h>
+#import <OpenGL/gl3.h>
+#import "RTCOpenGLVideoRenderer.h"
+#import "RTCVideoRenderer.h"
+
+@interface RTCNSGLVideoView () <RTCVideoRendererDelegate>
+// |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(atomic, strong) RTCOpenGLVideoRenderer* glRenderer;
+- (void)drawFrame;
+@end
+
+static CVReturn OnDisplayLinkFired(CVDisplayLinkRef displayLink,
+                                   const CVTimeStamp* now,
+                                   const CVTimeStamp* outputTime,
+                                   CVOptionFlags flagsIn,
+                                   CVOptionFlags* flagsOut,
+                                   void* displayLinkContext) {
+  RTCNSGLVideoView* view = (__bridge RTCNSGLVideoView*)displayLinkContext;
+  [view drawFrame];
+  return kCVReturnSuccess;
+}
+
+@implementation RTCNSGLVideoView {
+  CVDisplayLinkRef _displayLink;
+  RTCVideoRenderer* _videoRenderer;
+}
+
+- (instancetype)initWithFrame:(NSRect)frame
+                  pixelFormat:(NSOpenGLPixelFormat*)format {
+  if (self = [super initWithFrame:frame pixelFormat:format]) {
+    _videoRenderer = [[RTCVideoRenderer alloc] initWithDelegate:self];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  [self teardownDisplayLink];
+}
+
+- (void)drawRect:(NSRect)rect {
+  [self drawFrame];
+}
+
+- (void)reshape {
+  [super reshape];
+  NSRect frame = [self frame];
+  CGLLockContext([[self openGLContext] CGLContextObj]);
+  glViewport(0, 0, frame.size.width, frame.size.height);
+  CGLUnlockContext([[self openGLContext] CGLContextObj]);
+}
+
+- (void)lockFocus {
+  NSOpenGLContext* context = [self openGLContext];
+  [super lockFocus];
+  if ([context view] != self) {
+    [context setView:self];
+  }
+  [context makeCurrentContext];
+}
+
+- (void)prepareOpenGL {
+  [super prepareOpenGL];
+  if (!self.glRenderer) {
+    self.glRenderer =
+        [[RTCOpenGLVideoRenderer alloc] initWithContext:[self openGLContext]];
+  }
+  [self.glRenderer setupGL];
+  [self setupDisplayLink];
+}
+
+- (void)clearGLContext {
+  [self.glRenderer teardownGL];
+  self.glRenderer = nil;
+  [super clearGLContext];
+}
+
+- (void)setVideoTrack:(RTCVideoTrack*)videoTrack {
+  if (_videoTrack == videoTrack) {
+    return;
+  }
+  if (_videoTrack) {
+    [_videoTrack removeRenderer:_videoRenderer];
+    CVDisplayLinkStop(_displayLink);
+  }
+  _videoTrack = videoTrack;
+  if (_videoTrack) {
+    [_videoTrack addRenderer:_videoRenderer];
+    CVDisplayLinkStart(_displayLink);
+  }
+}
+
+#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 {
+  dispatch_async(dispatch_get_main_queue(), ^{
+    [self.delegate videoView:self didChangeVideoSize:size];
+  });
+}
+
+- (void)renderer:(RTCVideoRenderer*)renderer
+    didReceiveFrame:(RTCI420Frame*)frame {
+  self.i420Frame = frame;
+}
+
+#pragma mark - Private
+
+- (void)drawFrame {
+  RTCI420Frame* i420Frame = self.i420Frame;
+  if (i420Frame && self.glRenderer.lastDrawnFrame != i420Frame) {
+    // This method may be called from CVDisplayLink callback which isn't on the
+    // main thread so we have to lock the GL context before drawing.
+    CGLLockContext([[self openGLContext] CGLContextObj]);
+    [self.glRenderer drawFrame:i420Frame];
+    CGLUnlockContext([[self openGLContext] CGLContextObj]);
+  }
+}
+
+- (void)setupDisplayLink {
+  if (_displayLink) {
+    return;
+  }
+  // Synchronize buffer swaps with vertical refresh rate.
+  GLint swapInt = 1;
+  [[self openGLContext] setValues:&swapInt forParameter:NSOpenGLCPSwapInterval];
+
+  // Create display link.
+  CVDisplayLinkCreateWithActiveCGDisplays(&_displayLink);
+  CVDisplayLinkSetOutputCallback(_displayLink,
+                                 &OnDisplayLinkFired,
+                                 (__bridge void*)self);
+  // Set the display link for the current renderer.
+  CGLContextObj cglContext = [[self openGLContext] CGLContextObj];
+  CGLPixelFormatObj cglPixelFormat = [[self pixelFormat] CGLPixelFormatObj];
+  CVDisplayLinkSetCurrentCGDisplayFromOpenGLContext(
+      _displayLink, cglContext, cglPixelFormat);
+  if (_videoTrack) {
+    CVDisplayLinkStart(_displayLink);
+  }
+}
+
+- (void)teardownDisplayLink {
+  if (!_displayLink) {
+    return;
+  }
+  CVDisplayLinkRelease(_displayLink);
+  _displayLink = NULL;
+}
+
+@end