diff options
Diffstat (limited to 'third_party/libwebrtc/sdk/objc/components/renderer/opengl/RTCNSGLVideoView.m')
| -rw-r--r-- | third_party/libwebrtc/sdk/objc/components/renderer/opengl/RTCNSGLVideoView.m | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/third_party/libwebrtc/sdk/objc/components/renderer/opengl/RTCNSGLVideoView.m b/third_party/libwebrtc/sdk/objc/components/renderer/opengl/RTCNSGLVideoView.m new file mode 100644 index 0000000000..168c73126f --- /dev/null +++ b/third_party/libwebrtc/sdk/objc/components/renderer/opengl/RTCNSGLVideoView.m @@ -0,0 +1,199 @@ +/* + * Copyright 2015 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 <Foundation/Foundation.h> + +#if !TARGET_OS_IPHONE + +#import "RTCNSGLVideoView.h" + +#import <AppKit/NSOpenGL.h> +#import <CoreVideo/CVDisplayLink.h> +#import <OpenGL/gl3.h> + +#import "RTCDefaultShader.h" +#import "RTCI420TextureCache.h" +#import "base/RTCLogging.h" +#import "base/RTCVideoFrame.h" + +@interface RTC_OBJC_TYPE (RTCNSGLVideoView) +() + // `videoFrame` 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) RTC_OBJC_TYPE(RTCVideoFrame) * + videoFrame; +@property(atomic, strong) RTCI420TextureCache *i420TextureCache; + +- (void)drawFrame; +@end + +static CVReturn OnDisplayLinkFired(CVDisplayLinkRef displayLink, + const CVTimeStamp *now, + const CVTimeStamp *outputTime, + CVOptionFlags flagsIn, + CVOptionFlags *flagsOut, + void *displayLinkContext) { + RTC_OBJC_TYPE(RTCNSGLVideoView) *view = + (__bridge RTC_OBJC_TYPE(RTCNSGLVideoView) *)displayLinkContext; + [view drawFrame]; + return kCVReturnSuccess; +} + +@implementation RTC_OBJC_TYPE (RTCNSGLVideoView) { + CVDisplayLinkRef _displayLink; + RTC_OBJC_TYPE(RTCVideoFrame) * _lastDrawnFrame; + id<RTC_OBJC_TYPE(RTCVideoViewShading)> _shader; +} + +@synthesize delegate = _delegate; +@synthesize videoFrame = _videoFrame; +@synthesize i420TextureCache = _i420TextureCache; + +- (instancetype)initWithFrame:(NSRect)frame pixelFormat:(NSOpenGLPixelFormat *)format { + return [self initWithFrame:frame pixelFormat:format shader:[[RTCDefaultShader alloc] init]]; +} + +- (instancetype)initWithFrame:(NSRect)frame + pixelFormat:(NSOpenGLPixelFormat *)format + shader:(id<RTC_OBJC_TYPE(RTCVideoViewShading)>)shader { + if (self = [super initWithFrame:frame pixelFormat:format]) { + _shader = shader; + } + return self; +} + +- (void)dealloc { + [self teardownDisplayLink]; +} + +- (void)drawRect:(NSRect)rect { + [self drawFrame]; +} + +- (void)reshape { + [super reshape]; + NSRect frame = [self frame]; + [self ensureGLContext]; + 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]; + [self ensureGLContext]; + glDisable(GL_DITHER); + [self setupDisplayLink]; +} + +- (void)clearGLContext { + [self ensureGLContext]; + self.i420TextureCache = nil; + [super clearGLContext]; +} + +#pragma mark - RTC_OBJC_TYPE(RTCVideoRenderer) + +// These methods may be called on non-main thread. +- (void)setSize:(CGSize)size { + dispatch_async(dispatch_get_main_queue(), ^{ + [self.delegate videoView:self didChangeVideoSize:size]; + }); +} + +- (void)renderFrame:(RTC_OBJC_TYPE(RTCVideoFrame) *)frame { + self.videoFrame = frame; +} + +#pragma mark - Private + +- (void)drawFrame { + RTC_OBJC_TYPE(RTCVideoFrame) *frame = self.videoFrame; + if (!frame || frame == _lastDrawnFrame) { + return; + } + // 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. + NSOpenGLContext *context = [self openGLContext]; + CGLLockContext([context CGLContextObj]); + + [self ensureGLContext]; + glClear(GL_COLOR_BUFFER_BIT); + + // Rendering native CVPixelBuffer is not supported on OS X. + // TODO(magjed): Add support for NV12 texture cache on OS X. + frame = [frame newI420VideoFrame]; + if (!self.i420TextureCache) { + self.i420TextureCache = [[RTCI420TextureCache alloc] initWithContext:context]; + } + RTCI420TextureCache *i420TextureCache = self.i420TextureCache; + if (i420TextureCache) { + [i420TextureCache uploadFrameToTextures:frame]; + [_shader applyShadingForFrameWithWidth:frame.width + height:frame.height + rotation:frame.rotation + yPlane:i420TextureCache.yTexture + uPlane:i420TextureCache.uTexture + vPlane:i420TextureCache.vTexture]; + [context flushBuffer]; + _lastDrawnFrame = frame; + } + CGLUnlockContext([context 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); + CVDisplayLinkStart(_displayLink); +} + +- (void)teardownDisplayLink { + if (!_displayLink) { + return; + } + CVDisplayLinkRelease(_displayLink); + _displayLink = NULL; +} + +- (void)ensureGLContext { + NSOpenGLContext* context = [self openGLContext]; + NSAssert(context, @"context shouldn't be nil"); + if ([NSOpenGLContext currentContext] != context) { + [context makeCurrentContext]; + } +} + +@end + +#endif // !TARGET_OS_IPHONE |