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/*
* 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);
// Clear contents.
self.i420Frame = nil;
[self drawFrame];
}
_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 (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
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