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Diffstat (limited to '')
-rw-r--r-- | third_party/libwebrtc/sdk/objc/components/renderer/opengl/RTCEAGLVideoView.m | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/third_party/libwebrtc/sdk/objc/components/renderer/opengl/RTCEAGLVideoView.m b/third_party/libwebrtc/sdk/objc/components/renderer/opengl/RTCEAGLVideoView.m new file mode 100644 index 0000000000..89e62d2ce7 --- /dev/null +++ b/third_party/libwebrtc/sdk/objc/components/renderer/opengl/RTCEAGLVideoView.m @@ -0,0 +1,295 @@ +/* + * 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 "RTCEAGLVideoView.h" + +#import <GLKit/GLKit.h> + +#import "RTCDefaultShader.h" +#import "RTCDisplayLinkTimer.h" +#import "RTCI420TextureCache.h" +#import "RTCNV12TextureCache.h" +#import "base/RTCLogging.h" +#import "base/RTCVideoFrame.h" +#import "base/RTCVideoFrameBuffer.h" +#import "components/video_frame_buffer/RTCCVPixelBuffer.h" + +// RTC_OBJC_TYPE(RTCEAGLVideoView) wraps a GLKView which is setup with +// enableSetNeedsDisplay = NO for the purpose of gaining control of +// exactly when to call -[GLKView display]. This need for extra +// control is required to avoid triggering method calls on GLKView +// that results in attempting to bind the underlying render buffer +// when the drawable size would be empty which would result in the +// error GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT. -[GLKView display] is +// the method that will trigger the binding of the render +// buffer. Because the standard behaviour of -[UIView setNeedsDisplay] +// is disabled for the reasons above, the RTC_OBJC_TYPE(RTCEAGLVideoView) maintains +// its own `isDirty` flag. + +@interface RTC_OBJC_TYPE (RTCEAGLVideoView) +()<GLKViewDelegate> + // `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(nonatomic, readonly) GLKView *glkView; +@end + +@implementation RTC_OBJC_TYPE (RTCEAGLVideoView) { + RTCDisplayLinkTimer *_timer; + EAGLContext *_glContext; + // This flag should only be set and read on the main thread (e.g. by + // setNeedsDisplay) + BOOL _isDirty; + id<RTC_OBJC_TYPE(RTCVideoViewShading)> _shader; + RTCNV12TextureCache *_nv12TextureCache; + RTCI420TextureCache *_i420TextureCache; + // As timestamps should be unique between frames, will store last + // drawn frame timestamp instead of the whole frame to reduce memory usage. + int64_t _lastDrawnFrameTimeStampNs; +} + +@synthesize delegate = _delegate; +@synthesize videoFrame = _videoFrame; +@synthesize glkView = _glkView; +@synthesize rotationOverride = _rotationOverride; + +- (instancetype)initWithFrame:(CGRect)frame { + return [self initWithFrame:frame shader:[[RTCDefaultShader alloc] init]]; +} + +- (instancetype)initWithCoder:(NSCoder *)aDecoder { + return [self initWithCoder:aDecoder shader:[[RTCDefaultShader alloc] init]]; +} + +- (instancetype)initWithFrame:(CGRect)frame shader:(id<RTC_OBJC_TYPE(RTCVideoViewShading)>)shader { + if (self = [super initWithFrame:frame]) { + _shader = shader; + if (![self configure]) { + return nil; + } + } + return self; +} + +- (instancetype)initWithCoder:(NSCoder *)aDecoder + shader:(id<RTC_OBJC_TYPE(RTCVideoViewShading)>)shader { + if (self = [super initWithCoder:aDecoder]) { + _shader = shader; + if (![self configure]) { + return nil; + } + } + return self; +} + +- (BOOL)configure { + EAGLContext *glContext = + [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES3]; + if (!glContext) { + glContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2]; + } + if (!glContext) { + RTCLogError(@"Failed to create EAGLContext"); + return NO; + } + _glContext = 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; + _glkView.enableSetNeedsDisplay = NO; + [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 RTC_OBJC_TYPE(RTCEAGLVideoView) *weakSelf = self; + _timer = [[RTCDisplayLinkTimer alloc] initWithTimerHandler:^{ + RTC_OBJC_TYPE(RTCEAGLVideoView) *strongSelf = weakSelf; + [strongSelf displayLinkTimerDidFire]; + }]; + if ([[UIApplication sharedApplication] applicationState] == UIApplicationStateActive) { + [self setupGL]; + } + return YES; +} + +- (void)setMultipleTouchEnabled:(BOOL)multipleTouchEnabled { + [super setMultipleTouchEnabled:multipleTouchEnabled]; + _glkView.multipleTouchEnabled = multipleTouchEnabled; +} + +- (void)dealloc { + [[NSNotificationCenter defaultCenter] removeObserver:self]; + UIApplicationState appState = + [UIApplication sharedApplication].applicationState; + if (appState == UIApplicationStateActive) { + [self teardownGL]; + } + [_timer invalidate]; + [self ensureGLContext]; + _shader = nil; + if (_glContext && [EAGLContext currentContext] == _glContext) { + [EAGLContext setCurrentContext:nil]; + } +} + +#pragma mark - UIView + +- (void)setNeedsDisplay { + [super setNeedsDisplay]; + _isDirty = YES; +} + +- (void)setNeedsDisplayInRect:(CGRect)rect { + [super setNeedsDisplayInRect:rect]; + _isDirty = YES; +} + +- (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 { + // The renderer will draw the frame to the framebuffer corresponding to the + // one used by `view`. + RTC_OBJC_TYPE(RTCVideoFrame) *frame = self.videoFrame; + if (!frame || frame.timeStampNs == _lastDrawnFrameTimeStampNs) { + return; + } + RTCVideoRotation rotation = frame.rotation; + if(_rotationOverride != nil) { + [_rotationOverride getValue: &rotation]; + } + [self ensureGLContext]; + glClear(GL_COLOR_BUFFER_BIT); + if ([frame.buffer isKindOfClass:[RTC_OBJC_TYPE(RTCCVPixelBuffer) class]]) { + if (!_nv12TextureCache) { + _nv12TextureCache = [[RTCNV12TextureCache alloc] initWithContext:_glContext]; + } + if (_nv12TextureCache) { + [_nv12TextureCache uploadFrameToTextures:frame]; + [_shader applyShadingForFrameWithWidth:frame.width + height:frame.height + rotation:rotation + yPlane:_nv12TextureCache.yTexture + uvPlane:_nv12TextureCache.uvTexture]; + [_nv12TextureCache releaseTextures]; + + _lastDrawnFrameTimeStampNs = self.videoFrame.timeStampNs; + } + } else { + if (!_i420TextureCache) { + _i420TextureCache = [[RTCI420TextureCache alloc] initWithContext:_glContext]; + } + [_i420TextureCache uploadFrameToTextures:frame]; + [_shader applyShadingForFrameWithWidth:frame.width + height:frame.height + rotation:rotation + yPlane:_i420TextureCache.yTexture + uPlane:_i420TextureCache.uTexture + vPlane:_i420TextureCache.vTexture]; + + _lastDrawnFrameTimeStampNs = self.videoFrame.timeStampNs; + } +} + +#pragma mark - RTC_OBJC_TYPE(RTCVideoRenderer) + +// These methods may be called on non-main thread. +- (void)setSize:(CGSize)size { + __weak RTC_OBJC_TYPE(RTCEAGLVideoView) *weakSelf = self; + dispatch_async(dispatch_get_main_queue(), ^{ + RTC_OBJC_TYPE(RTCEAGLVideoView) *strongSelf = weakSelf; + [strongSelf.delegate videoView:strongSelf didChangeVideoSize:size]; + }); +} + +- (void)renderFrame:(RTC_OBJC_TYPE(RTCVideoFrame) *)frame { + self.videoFrame = frame; +} + +#pragma mark - Private + +- (void)displayLinkTimerDidFire { + // Don't render unless video frame have changed or the view content + // has explicitly been marked dirty. + if (!_isDirty && _lastDrawnFrameTimeStampNs == self.videoFrame.timeStampNs) { + return; + } + + // Always reset isDirty at this point, even if -[GLKView display] + // won't be called in the case the drawable size is empty. + _isDirty = NO; + + // Only call -[GLKView display] if the drawable size is + // non-empty. Calling display will make the GLKView setup its + // render buffer if necessary, but that will fail with error + // GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT if size is empty. + if (self.bounds.size.width > 0 && self.bounds.size.height > 0) { + [_glkView display]; + } +} + +- (void)setupGL { + [self ensureGLContext]; + glDisable(GL_DITHER); + _timer.isPaused = NO; +} + +- (void)teardownGL { + self.videoFrame = nil; + _timer.isPaused = YES; + [_glkView deleteDrawable]; + [self ensureGLContext]; + _nv12TextureCache = nil; + _i420TextureCache = nil; +} + +- (void)didBecomeActive { + [self setupGL]; +} + +- (void)willResignActive { + [self teardownGL]; +} + +- (void)ensureGLContext { + NSAssert(_glContext, @"context shouldn't be nil"); + if ([EAGLContext currentContext] != _glContext) { + [EAGLContext setCurrentContext:_glContext]; + } +} + +@end |