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Telegram/SourceFiles/media/streaming/media_streaming_utility.h

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+#include "media/streaming/media_streaming_common.h"
+#include "ffmpeg/ffmpeg_utility.h"
+
+namespace Media {
+namespace Streaming {
+
+struct TimePoint {
+	crl::time trackTime = kTimeUnknown;
+	crl::time worldTime = kTimeUnknown;
+
+	bool valid() const {
+		return (trackTime != kTimeUnknown) && (worldTime != kTimeUnknown);
+	}
+	explicit operator bool() const {
+		return valid();
+	}
+};
+
+struct Stream {
+	int index = -1;
+	crl::time duration = kTimeUnknown;
+	AVRational timeBase = FFmpeg::kUniversalTimeBase;
+	FFmpeg::CodecPointer codec;
+	FFmpeg::FramePointer decodedFrame;
+	FFmpeg::FramePointer transferredFrame;
+	std::deque<FFmpeg::Packet> queue;
+	int invalidDataPackets = 0;
+
+	// Audio only.
+	int frequency = 0;
+
+	// Video only.
+	int rotation = 0;
+	AVRational aspect = FFmpeg::kNormalAspect;
+	FFmpeg::SwscalePointer swscale;
+};
+
+[[nodiscard]] crl::time FramePosition(const Stream &stream);
+[[nodiscard]] FFmpeg::AvErrorWrap ProcessPacket(
+	Stream &stream,
+	FFmpeg::Packet &&packet);
+[[nodiscard]] FFmpeg::AvErrorWrap ReadNextFrame(Stream &stream);
+
+[[nodiscard]] bool GoodForRequest(
+	const QImage &image,
+	bool hasAlpha,
+	int rotation,
+	const FrameRequest &request);
+[[nodiscard]] bool TransferFrame(
+	Stream &stream,
+	not_null<AVFrame*> decodedFrame,
+	not_null<AVFrame*> transferredFrame);
+[[nodiscard]] QImage ConvertFrame(
+	Stream &stream,
+	not_null<AVFrame*> frame,
+	QSize resize,
+	QImage storage);
+[[nodiscard]] FrameYUV ExtractYUV(Stream &stream, AVFrame *frame);
+
+struct ExpandDecision {
+	QSize result;
+	bool expanding = false;
+};
+[[nodiscard]] ExpandDecision DecideFrameResize(
+	QSize outer,
+	QSize original,
+	int minVisibleNominator = 3, // If we cut out no more than 0.25 of
+	int minVisibleDenominator = 4); // the original, let's expand.
+[[nodiscard]] bool FrameResizeMayExpand(
+	QSize outer,
+	QSize original,
+	int minVisibleNominator = 3,
+	int minVisibleDenominator = 4);
+[[nodiscard]] ExpandDecision DecideVideoFrameResize(
+	QSize outer,
+	QSize original);
+[[nodiscard]] QSize CalculateResizeFromOuter(QSize outer, QSize original);
+[[nodiscard]] QImage PrepareBlurredBackground(QSize outer, QImage frame);
+void FillBlurredBackground(QPainter &p, QSize outer, QImage bg);
+[[nodiscard]] QImage PrepareByRequest(
+	const QImage &original,
+	bool hasAlpha,
+	const AVRational &aspect,
+	int rotation,
+	const FrameRequest &request,
+	QImage storage);
+
+} // namespace Streaming
+} // namespace Media