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/*
* Copyright 2017 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#import "RTCMTLNSVideoView.h"
#import <Metal/Metal.h>
#import <MetalKit/MetalKit.h>
#import "base/RTCVideoFrame.h"
#import "RTCMTLI420Renderer.h"
@interface RTC_OBJC_TYPE (RTCMTLNSVideoView)
()<MTKViewDelegate> @property(nonatomic) id<RTCMTLRenderer> renderer;
@property(nonatomic, strong) MTKView *metalView;
@property(atomic, strong) RTC_OBJC_TYPE(RTCVideoFrame) * videoFrame;
@end
@implementation RTC_OBJC_TYPE (RTCMTLNSVideoView) {
id<RTCMTLRenderer> _renderer;
}
@synthesize delegate = _delegate;
@synthesize renderer = _renderer;
@synthesize metalView = _metalView;
@synthesize videoFrame = _videoFrame;
- (instancetype)initWithFrame:(CGRect)frameRect {
self = [super initWithFrame:frameRect];
if (self) {
[self configure];
}
return self;
}
- (instancetype)initWithCoder:(NSCoder *)aCoder {
self = [super initWithCoder:aCoder];
if (self) {
[self configure];
}
return self;
}
#pragma mark - Private
+ (BOOL)isMetalAvailable {
return [MTLCopyAllDevices() count] > 0;
}
- (void)configure {
if ([[self class] isMetalAvailable]) {
_metalView = [[MTKView alloc] initWithFrame:self.bounds];
[self addSubview:_metalView];
_metalView.layerContentsPlacement = NSViewLayerContentsPlacementScaleProportionallyToFit;
_metalView.translatesAutoresizingMaskIntoConstraints = NO;
_metalView.framebufferOnly = YES;
_metalView.delegate = self;
_renderer = [[RTCMTLI420Renderer alloc] init];
if (![(RTCMTLI420Renderer *)_renderer addRenderingDestination:_metalView]) {
_renderer = nil;
};
}
}
- (void)updateConstraints {
NSDictionary *views = NSDictionaryOfVariableBindings(_metalView);
NSArray *constraintsHorizontal =
[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[_metalView]-0-|"
options:0
metrics:nil
views:views];
[self addConstraints:constraintsHorizontal];
NSArray *constraintsVertical =
[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[_metalView]-0-|"
options:0
metrics:nil
views:views];
[self addConstraints:constraintsVertical];
[super updateConstraints];
}
#pragma mark - MTKViewDelegate methods
- (void)drawInMTKView:(nonnull MTKView *)view {
if (self.videoFrame == nil) {
return;
}
if (view == self.metalView) {
[_renderer drawFrame:self.videoFrame];
}
}
- (void)mtkView:(MTKView *)view drawableSizeWillChange:(CGSize)size {
}
#pragma mark - RTC_OBJC_TYPE(RTCVideoRenderer)
- (void)setSize:(CGSize)size {
_metalView.drawableSize = size;
dispatch_async(dispatch_get_main_queue(), ^{
[self.delegate videoView:self didChangeVideoSize:size];
});
[_metalView draw];
}
- (void)renderFrame:(nullable RTC_OBJC_TYPE(RTCVideoFrame) *)frame {
if (frame == nil) {
return;
}
self.videoFrame = [frame newI420VideoFrame];
}
@end
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