forked from mia/Aegisub
4bdccb889c
At least on OS X, allocating the buffers is one of the more expensive parts of video playback, and on an arbitrary 720p H.264 file with simple subtitles this cuts CPU usage while playing by about 30%.
80 lines
3.8 KiB
C++
80 lines
3.8 KiB
C++
// Copyright (c) 2007, Niels Martin Hansen
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of the Aegisub Group nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Aegisub Project http://www.aegisub.org/
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/// @file video_provider_dummy.h
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/// @see video_provider_dummy.cpp
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/// @ingroup video_input
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///
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#include "include/aegisub/video_provider.h"
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namespace agi { struct Color; }
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/// @class DummyVideoProvider
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/// @brief A dummy video provider for when opening a file is just too much effort
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///
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/// This simply returns a single constant frame, which can either be a flat
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/// color or a checkerboard pattern
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class DummyVideoProvider final : public VideoProvider {
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int framecount; ///< Length of the dummy video in frames
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agi::vfr::Framerate fps; ///< Frame rate to use
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int width; ///< Width in pixels
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int height; ///< Height in pixels
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/// The data for the image returned for all frames
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std::vector<unsigned char> data;
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public:
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/// Create a dummy video from separate parameters
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/// @param fps Frame rate of the dummy video
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/// @param frames Length in frames of the dummy video
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/// @param width Width in pixels of the dummy video
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/// @param height Height in pixels of the dummy video
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/// @param colour Primary colour of the dummy video
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/// @param pattern Use a checkerboard pattern rather than a solid colour
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DummyVideoProvider(double fps, int frames, int width, int height, agi::Color colour, bool pattern);
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/// Make a fake filename which when passed to the constructor taking a
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/// string will result in a video with the given parameters
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static std::string MakeFilename(double fps, int frames, int width, int height, agi::Color colour, bool pattern);
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void GetFrame(int n, VideoFrame &frame) override;
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void SetColorSpace(std::string const&) override { }
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int GetFrameCount() const override { return framecount; }
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int GetWidth() const override { return width; }
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int GetHeight() const override { return height; }
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double GetDAR() const override { return 0; }
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agi::vfr::Framerate GetFPS() const override { return fps; }
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std::vector<int> GetKeyFrames() const override { return {}; }
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std::string GetColorSpace() const override { return "None"; }
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std::string GetDecoderName() const override { return "Dummy Video Provider"; }
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bool ShouldSetVideoProperties() const override { return false; }
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};
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