{"id":897,"date":"2023-05-19T11:57:00","date_gmt":"2023-05-19T03:57:00","guid":{"rendered":"http:\/\/www.olinone.com\/?p=897"},"modified":"2023-05-19T11:57:00","modified_gmt":"2023-05-19T03:57:00","slug":"pag%e5%8a%a8%e6%95%88%e6%a1%86%e6%9e%b6%e6%ba%90%e7%a0%81%e7%ac%94%e8%ae%b0-%ef%bc%88%e4%b8%89%ef%bc%89%e6%92%ad%e6%94%be%e6%b5%81%e7%a8%8b","status":"publish","type":"post","link":"http:\/\/www.olinone.com\/?p=897","title":{"rendered":"PAG\u52a8\u6548\u6846\u67b6\u6e90\u7801\u7b14\u8bb0 \uff08\u4e09\uff09\u64ad\u653e\u6d41\u7a0b"},"content":{"rendered":"

\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u51fa\u5904\uff1a<\/span>http:\/\/www.olinone.com\/<\/a><\/span><\/p>\n

PAG\u6846\u67b6\u652f\u6301\u5355PAGView\u540c\u65f6\u6e32\u67d3\u591a\u4e2aPAGFile\uff0c\u76f8\u8f83\u4e8e\u6e32\u67d3\u5355\u4e00\u6587\u4ef6\uff0c\u6846\u67b6\u9996\u5148\u9700\u8981\u89e3\u51b3\u591a\u6587\u4ef6\u6e32\u67d3\u540c\u6b65\u95ee\u9898<\/span><\/p>\n

1\u3001\u591a\u6587\u4ef6\u6e32\u67d3\u5e27\u7387\u540c\u6b65<\/span><\/strong><\/span><\/h5>\n

\u591a\u6587\u4ef6\u6709\u7740\u4e0d\u540c\u7684\u5e27\u7387(FPS) \uff0c\u4e3a\u4e86\u5b9e\u73b0\u540c\u4e00\u5bb9\u5668\u6e32\u67d3\u4e0d\u540c\u5e27\u7387\u6587\u4ef6\uff0c\u4f20\u7edf\u7684\u57fa\u4e8e\u5b9a\u65f6\u5668\u6a21\u5f0f\uff08\u5b9a\u65f6\u56de\u8c03\uff0c\u95f4\u9694\u4e0e\u5e27\u7387\u540c\u6b65\uff09\u7684\u56de\u8c03\u5df2\u65e0\u6cd5\u6ee1\u8db3\u8be5\u573a\u666f<\/span><\/p>\n

2\u3001\u591a\u6587\u4ef6\u6e32\u67d3\u8fdb\u5ea6\u540c\u6b65<\/span><\/strong><\/span><\/h5>\n

\u591a\u6587\u4ef6\u6e32\u67d3\u9700\u8981\u907f\u514d\u591a\u56fe\u5c42\u6e32\u67d3\u8fdb\u5ea6\u4e0d\u4e00\u81f4\u95ee\u9898\uff1b\u4e3a\u4e86\u4fdd\u8bc1\u64ad\u653e\u6d41\u7545\u5ea6\uff0c\u901a\u5e38\u4f1a\u5728\u5b50\u7ebf\u7a0b\u89e3\u7801\u89c6\u9891\u5e27\uff0c\u5f53\u6e32\u67d3\u591a\u89c6\u9891\u56fe\u5c42\u65f6\uff0c\u5982\u4f55\u4fdd\u8bc1\u591a\u89e3\u7801\u7ebf\u7a0b\u4e0b\u7684\u5e27\u540c\u6b65\uff1f<\/span><\/p>\n

3\u3001\u591a\u6587\u4ef6\u64ad\u653e\u533a\u95f4\u63a7\u5236<\/span><\/strong><\/span><\/h5>\n

PAG\u652f\u6301File\u81ea\u5b9a\u4e49\u663e\u793a\u533a\u95f4\uff0c\u6bcf\u4e2aFile\u6587\u4ef6\u65f6\u957f\u4e5f\u4e0d\u4e00\u81f4\uff0c\u5982\u4f55\u63a7\u5236\u4e0d\u540c\u6587\u4ef6\u7684\u64ad\u653e\u533a\u95f4\uff1f<\/span><\/p>\n

\u64ad\u653e\u8fdb\u5ea6<\/span><\/h4>\n

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PAG\u6ca1\u6709\u91c7\u7528\u7c7b\u4f3c\u4e8eCMTime\u5e27\u6570\u7684\u65b9\u5f0f\u8bb0\u5f55\u64ad\u653e\u8fdb\u5ea6\uff0c\u800c\u662f\u901a\u8fc7\u65f6\u957f\u767e\u5206\u6bd4\u8bb0\u5f55\u5404\u5c42\u7ea7\u64ad\u653e\u8fdb\u5ea6\uff0c\u4ece\u800c\u5b9e\u73b0\u4e0d\u540c\u5e27\u7387\uff08FPS\uff09\u6587\u4ef6\u7684\u8fdb\u5ea6\u540c\u6b65<\/span><\/p>\n

bool PAGComposition::gotoTime(int64_t layerTime) {\r\n \u00a0auto changed = PAGLayer::gotoTime(layerTime);\r\n \u00a0auto compositionOffset =\r\n \u00a0 \u00a0 \u00a0\/\/ \u76f8\u5bf9\u8d77\u59cb\u65f6\u95f4\r\n \u00a0 \u00a0 \u00a0static_cast<PreComposeLayer*>(layer)->compositionStartTime - layer->startTime + startFrame;\r\n \u00a0auto compositionOffsetTime =\r\n \u00a0 \u00a0 \u00a0static_cast<Frame>(floor(compositionOffset * 1000000.0 \/ frameRateInternal()));\r\n \u00a0for (auto& layer : layers) {\r\n \u00a0 \u00a0\/\/ \u5404\u56fe\u5c42\u8bb0\u5f55\u5404\u81ea\u7684\u64ad\u653e\u8fdb\u5ea6\r\n \u00a0 \u00a0if (layer->gotoTime(layerTime - compositionOffsetTime)) {\r\n \u00a0 \u00a0 \u00a0changed = true;\r\n \u00a0  }\r\n  }\r\n \u00a0return changed;\r\n}\r\n\u200b\r\nbool PAGLayer::gotoTime(int64_t layerTime) {\r\n  ...\r\n \u00a0\/\/ \u4f7f\u7528\u5404\u81ea\u5e27\u7387\u8f6c\u5316\u6210\u5bf9\u5e94\u5e27\r\n \u00a0auto layerFrame = TimeToFrame(layerTime, frameRateInternal());\r\n \u00a0auto oldContentFrame = contentFrame;\r\n \u00a0contentFrame = layerFrame - startFrame;\r\n  ...\r\n \u00a0return changed;\r\n}<\/pre>\n
\u91c7\u7528\u65f6\u957f\u767e\u5206\u6bd4\u8bb0\u5f55\u8fdb\u5ea6\u4f1a\u5bfc\u81f4flush\u7ed8\u5236\u91cd\u590d\u5e27\uff0c\u4e3a\u4e86\u89e3\u51b3\u6027\u80fd\u95ee\u9898\uff0cPAG\u5f15\u5165\u4e86LayerCache\u89d2\u8272\uff0c\u5f53\u91cd\u590d\u7ed8\u5236\u540c\u4e00\u5e27\u65f6\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u7f13\u5b58\u6570\u636e<\/span><\/p>\n
Content* PAGLayer::getContent() {\r\n \u00a0return layerCache->getContent(contentFrame);\r\n}<\/pre>\n
PAG\u4fe1\u53f7\u6e90PAGValueAnimator\u901a\u8fc7\u7edd\u5bf9\u65f6\u95f4\u5dee\u503c\u8ba1\u7b97\u64ad\u653e\u8fdb\u5ea6\uff0c\u591a\u4e2aPAGView\u5171\u7528\u4e00\u4e2a\u5168\u5c40\u4fe1\u53f7\u89e6\u53d1\u5668<\/span><\/p>\n
\/\/ \u83b7\u53d6\u7edd\u5bf9\u65f6\u95f4\u6233\r\nstatic int64_t GetCurrentTimeUS() {\r\n \u00a0static auto START_TIME = std::chrono::high_resolution_clock::now();\r\n \u00a0auto now = std::chrono::high_resolution_clock::now();\r\n \u00a0auto ns = std::chrono::duration_cast<std::chrono::nanoseconds>(now - START_TIME);\r\n \u00a0return static_cast<int64_t>(ns.count() * 1e-3);\r\n}\r\n\u200b\r\n- (void)start {\r\n  ...\r\n \u00a0\/\/ PAG\u652f\u6301\u91cd\u590d\u64ad\u653e\r\n \u00a0if (repeatedTimes >= (repeatCount + 1)) {\r\n \u00a0 \u00a0repeatedTimes = 0;\r\n  }\r\n \u00a0self.animatorId = [PAGValueAnimator AddAnimator:self];\r\n \u00a0\/\/ startTime\u4e0d\u662f\u6700\u521d\u5f00\u59cb\u65f6\u95f4\uff0c\u6bcf\u6b21\u6682\u505c\u6062\u590d\u64ad\u653e\u540e\u4f1a\u91cd\u65b0\u8bb0\u5f55\r\n \u00a0startTime = GetCurrentTimeUS() - playTime % duration - repeatedTimes * duration;\r\n \u00a0animatedFraction = static_cast<double>(playTime) \/ duration;\r\n  ...\r\n}\r\n\u200b\r\n- (void)onAnimationFrame:(int64_t)timestamp {\r\n \u00a0auto count = (timestamp - startTime) \/ duration;\r\n \u00a0if (repeatCount >= 0 && count > repeatCount) {\r\n \u00a0 \u00a0\/\/ \u64ad\u653e\u7ed3\u675f\r\n \u00a0 \u00a0playTime = duration;\r\n \u00a0 \u00a0animatedFraction = 1.0;\r\n \u00a0  ...\r\n  } else {\r\n \u00a0 \u00a0\/\/ \u5f53\u6b21\u64ad\u653e\u65f6\u95f4\u6233\r\n \u00a0 \u00a0playTime = (timestamp - startTime) % duration;\r\n \u00a0 \u00a0animatedFraction = static_cast<double>(playTime) \/ duration;\r\n \u00a0  ...\r\n}<\/pre>\n
\u64ad\u653e\u6d41\u7a0b<\/span><\/h4>\n
1\u3001\u4fe1\u53f7\u89e6\u53d1<\/span><\/h5>\n
- (void)onAnimationUpdate {\r\n \u00a0\/\/ \u89e6\u53d1\u66f4\u65b0\r\n  [self updateView];\r\n}\r\n\u200b\r\n- (BOOL)flush {\r\n  ...\r\n \u00a0\/\/ \u66f4\u65b0\u64ad\u653e\u8fdb\u5ea6\r\n  [pagPlayer setProgress:[valueAnimator getAnimatedFraction]];\r\n \u00a0\/\/ \u89e6\u53d1\u5237\u65b0\r\n \u00a0result = [pagPlayer flush];\r\n  ...\r\n}<\/pre>\n
2\u3001\u66f4\u65b0\u64ad\u653e\u8fdb\u5ea6<\/span><\/h5>\n
void PAGPlayer::setProgress(double percent) {\r\n \u00a0\/\/ \u83b7\u53d6\u6e32\u67d3\u56fe\u5c42\uff0c\u9012\u5f52\u66f4\u65b0\u5404\u56fe\u5c42\u64ad\u653e\u8fdb\u5ea6\r\n \u00a0auto pagComposition = stage->getRootComposition();\r\n \u00a0pagComposition->setProgressInternal(realProgress);\r\n}\r\n\u200b\r\nvoid PAGLayer::setProgressInternal(double percent) {\r\n \u00a0\/\/ \u5404\u56fe\u5c42\u8d77\u59cb\u64ad\u653e\u65f6\u95f4\u4e0d\u540c\uff0c\u8f6c\u5316\u4e3a\u5168\u5c40\u6574\u4f53\u64ad\u653e\u65f6\u95f4\u6233\r\n \u00a0gotoTimeAndNotifyChanged(startTimeInternal() + ProgressToTime(percent, durationInternal()));\r\n}<\/pre>\n
3\u3001\u89e6\u53d1\u6e32\u67d3<\/span><\/h5>\n
bool PAGPlayer::flushInternal(BackendSemaphore* signalSemaphore) {\r\n \u00a0\/\/ \u56fe\u5c42\u9884\u5904\u7406\uff0c\u751f\u6210\u64ad\u653e\u65f6\u95f4\u6233\u5bf9\u5e94\u7684\u56fe\u5f62\u6a21\u578b\uff0c\u6a21\u578b\u8f6c\u5316\u53c2\u8003\u4e0a\u4e00\u7ae0\u5c42\u7ea7\u89c6\u56fe\u8bb2\u89e3\r\n \u00a0prepareInternal();\r\n \u00a0\/\/ \u7ed8\u5236\u56fe\u5c42\u5bf9\u8c61\r\n \u00a0if (!pagSurface->draw(renderCache, lastGraphic, signalSemaphore, _autoClear)) {\r\n \u00a0 \u00a0return false;\r\n  }\r\n  ...\r\n}\r\n\u200b\r\nvoid PAGSurface::onDraw(std::shared_ptr<Graphic> graphic, std::shared_ptr<tgfx::Surface> target, RenderCache* cache) {\r\n \u00a0auto canvas = target->getCanvas();\r\n \u00a0if (graphic) {\r\n \u00a0 \u00a0\/\/ \u9884\u5904\u7406\uff0c\u6bd4\u5982\u89c6\u9891\u5e27\u89e3\u7801\r\n \u00a0 \u00a0graphic->prepare(cache);\r\n \u00a0 \u00a0\/\/ \u6e32\u67d3\u5230\u753b\u5e03Canvas\r\n \u00a0 \u00a0graphic->draw(canvas, cache);\r\n  }\r\n}<\/pre>\n
4\u3001\u56fe\u5f62\u89e3\u7801\uff08\u4ee5\u89c6\u9891\u5e27\u4e3a\u4f8b\uff09<\/span><\/h5>\n
\/\/ \u9884\u5904\u7406\u89e3\u7801\r\nvoid RenderCache::prepareSequenceImage(std::shared_ptr<SequenceInfo> sequence, Frame targetFrame) {\r\n \u00a0\/\/ \u89e3\u7801\u961f\u5217\uff0c\u6bcf\u4e2a\u8d44\u6e90\u5bf9\u5e94\u4e00\u4e2a\u89e3\u7801\u961f\u5217\r\n \u00a0auto queue = getSequenceImageQueue(sequence, targetFrame);\r\n \u00a0if (queue != nullptr) {\r\n \u00a0 \u00a0queue->prepare(targetFrame);\r\n  }\r\n}\r\n\u200b\r\nvoid SequenceImageQueue::prepare(Frame targetFrame) {\r\n \u00a0\/\/ \u83b7\u53d6\u5f53\u524d\u5e27\u5bf9\u5e94\u7684image\u6570\u636e\uff0c\u5f00\u59cb\u89e3\u7801\uff08\u6bd4\u5982AVC\u89e3\u7801\uff09\r\n \u00a0auto image = sequence->makeFrameImage(reader, targetFrame);\r\n \u00a0preparedImage = image->makeDecoded();\r\n \u00a0preparedFrame = targetFrame;\r\n}\r\n\u200b\r\n\/\/ \u521b\u5efa\u5f02\u6b65\u89e3\u7801\u4efb\u52a1\r\nAsyncSource::AsyncSource(UniqueKey uniqueKey, std::shared_ptr<ImageGenerator> imageGenerator, bool mipMapped) {\r\n  ...\r\n \u00a0imageTask = ImageGeneratorTask::MakeFrom(generator, tryHardware);\r\n}\r\n\u200b\r\nImageGeneratorTask::ImageGeneratorTask(std::shared_ptr<ImageGenerator> generator, bool tryHardware) : imageGenerator(std::move(generator)) {\r\n  \/\/ \u89e3\u7801\u51fd\u6570\r\n \u00a0task = Task::Run([=] { imageBuffer = imageGenerator->makeBuffer(tryHardware); });\r\n}\r\n\u200b\r\nstd::shared_ptr<tgfx::ImageBuffer> VideoReader::onMakeBuffer(Frame targetFrame) {\r\n \u00a0auto targetTime = FrameToTime(targetFrame, frameRate);\r\n  ... \r\n \u00a0\/\/ \u89e3\u7801\r\n \u00a0auto sampleTime = demuxer->getSampleTimeAt(targetTime);\r\n \u00a0auto success = decodeFrame(sampleTime);\r\n \u00a0lastBuffer = videoDecoder->onRenderFrame();\r\n \u00a0return lastBuffer;\r\n}<\/pre>\n
5\u3001\u6e32\u67d3\u56fe\u5f62<\/span><\/h5>\n
void draw(tgfx::Canvas* canvas, RenderCache* cache) const override {\r\n \u00a0  ...\r\n \u00a0 \u00a0\/\/ \u83b7\u53d6\u89e3\u7801\u56fe\u5f62\r\n \u00a0 \u00a0auto image = proxy->getImage(cache);\r\n \u00a0 \u00a0canvas->drawImage(std::move(image));\r\n}\r\n\u200b\r\nstd::shared_ptr<tgfx::Image> SequenceImageQueue::getImage(Frame targetFrame) {\r\n \u00a0\/\/ \u76ee\u6807\u5e27\u5df2\u89e3\u7801\u76f4\u63a5\u8fd4\u56de\r\n \u00a0if (targetFrame == preparedFrame) {\r\n \u00a0 \u00a0currentImage = preparedImage;\r\n \u00a0 \u00a0return currentImage;\r\n  }\r\n \u00a0\/\/ \u540c\u6b65\u7b49\u5f85\u89e3\u7801\u540e\u7684\u6570\u636e\r\n \u00a0auto image = sequence->makeFrameImage(reader, targetFrame);\r\n \u00a0currentImage = image->makeDecoded();\r\n \u00a0return currentImage;\r\n}\r\n\u200b\r\nstd::shared_ptr<ImageBuffer> ImageGeneratorTask::getBuffer() const {\r\n \u00a0\/\/ \u7b49\u5f85\u76f4\u5230\u89e3\u7801\u5b8c\u6210\r\n \u00a0task->wait();\r\n \u00a0return imageBuffer;\r\n}\r\n\u200b\r\nvoid Task::wait() {\r\n \u00a0std::unique_lock<std::mutex> autoLock(locker);\r\n \u00a0if (!_executing) {\r\n \u00a0 \u00a0return;\r\n  }\r\n \u00a0\/\/ \u7b49\u5f85\u89e3\u7801\u9501\u91ca\u653e\r\n \u00a0condition.wait(autoLock);\r\n}<\/pre>\n
\u603b\u7ed3<\/span><\/h4>\n
\u4e3a\u4e86\u4f18\u5316\u64ad\u653e\u4f53\u9a8c\uff0cPAG\u4f7f\u7528\u4e86\u591a\u79cd\u6027\u80fd\u4f18\u5316\u7b56\u7565\uff0c\u5305\u62ec\u63d0\u524d\u9884\u89e3\u7801\u3001\u6e32\u67d3\u5e27\u590d\u7528\u3001GPU\u4f18\u5316\u7b49\u7b49<\/span><\/p>\n
void RenderCache::prepareLayers() {\r\n\/\/ \u63d0\u524d 500ms \u5f00\u59cb\u89e3\u7801\r\nint64_t timeDistance = DECODING_VISIBLE_DISTANCE;\r\nauto layerDistances = stage->findNearlyVisibleLayersIn(timeDistance);\r\nfor (auto& item : layerDistances) {\r\n\u00a0 for (auto pagLayer : item.second) {\r\n\u00a0 \u00a0 if (pagLayer->layerType() == LayerType::PreCompose) {\r\n\u00a0 \u00a0 \u00a0 preparePreComposeLayer(static_cast<PreComposeLayer*>(pagLayer->layer));\r\n\u00a0 \u00a0 } else if (pagLayer->layerType() == LayerType::Image) {\r\n\u00a0 \u00a0 \u00a0 prepareImageLayer(static_cast<PAGImageLayer*>(pagLayer));\r\n\u00a0 \u00a0 }\r\n\u00a0 }\r\n}\r\n}<\/pre>\n
PAG\u5e94\u7528\u6846\u67b6\u5c42\u4e3b\u8981\u8d1f\u8d23\u4e0a\u5c42\u4e1a\u52a1\u903b\u8f91\u5904\u7406\uff0c\u5305\u62ec\u6587\u4ef6\u89c6\u9891\u89e3\u7801\u3001\u64ad\u653e\u6d41\u7a0b\u63a7\u5236\u4ee5\u53ca\u751f\u6210\u6e32\u67d3\u5f15\u64ce\u6240\u9700\u8981\u7684\u6570\u636e\u6e90\u7b49\uff0c\u63a5\u4e0b\u6765\u5c06\u7ed3\u5408OpenGL\u8bb2\u89e3TGFX\u6e32\u67d3\u5f15\u64ce\u90e8\u5206<\/span><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u51fa\u5904\uff1ahttp:\/\/www.olinone.com\/ PAG\u6846\u67b6\u652f\u6301\u5355PAGView\u540c\u65f6\u6e32\u67d3\u591a\u4e2aPA\u2026 Read More »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.olinone.com\/index.php?rest_route=\/wp\/v2\/posts\/897"}],"collection":[{"href":"http:\/\/www.olinone.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.olinone.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.olinone.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.olinone.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=897"}],"version-history":[{"count":12,"href":"http:\/\/www.olinone.com\/index.php?rest_route=\/wp\/v2\/posts\/897\/revisions"}],"predecessor-version":[{"id":911,"href":"http:\/\/www.olinone.com\/index.php?rest_route=\/wp\/v2\/posts\/897\/revisions\/911"}],"wp:attachment":[{"href":"http:\/\/www.olinone.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=897"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.olinone.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=897"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.olinone.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}