Aegisub/src/video_provider_dummy.cpp

// Copyright (c) 2007, Rodrigo Braz Monteiro
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
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//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
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//   * Neither the name of the Aegisub Group nor the names of its contributors
//     may be used to endorse or promote products derived from this software
//     without specific prior written permission.
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// Aegisub Project http://www.aegisub.org/

/// @file video_provider_dummy.cpp
/// @brief Video provider returning a constant frame
/// @ingroup video_input
///

#include "video_provider_dummy.h"

#include "colorspace.h"
#include "video_frame.h"

#include <libaegisub/color.h>
#include <libaegisub/make_unique.h>
#include <libaegisub/util.h>

#include <boost/algorithm/string/predicate.hpp>
#include <boost/algorithm/string/split.hpp>
#include <boost/filesystem/path.hpp>
#include <libaegisub/format.h>
#include <boost/gil/gil_all.hpp>

DummyVideoProvider::DummyVideoProvider(double fps, int frames, int width, int height, agi::Color colour, bool pattern)
: framecount(frames)
, fps(fps)
, width(width)
, height(height)
{
	data.resize(width * height * 4);

	auto red = colour.r;
	auto green = colour.g;
	auto blue = colour.b;

	using namespace boost::gil;
	auto dst = interleaved_view(width, height, (bgra8_pixel_t*)data.data(), 4 * width);

	bgra8_pixel_t colors[2] = {
		bgra8_pixel_t(blue, green, red, 0),
		bgra8_pixel_t(blue, green, red, 0)
	};

	if (pattern) {
		// Generate light version
		unsigned char h, s, l;
		rgb_to_hsl(red, blue, green, &h, &s, &l);
		l += 24;
		if (l < 24) l -= 48;
		hsl_to_rgb(h, s, l, &red, &blue, &green);
		colors[1] = bgra8_pixel_t(blue, green, red, 0);

		// Divide into a 8x8 grid and use light colours when row % 2 != col % 2
		auto out = dst.begin();
		for (int y = 0; y < height; ++y)
			for (int x = 0; x < width; ++x)
				*out++ = colors[((y / 8) & 1) != ((x / 8) & 1)];
	}
	else {
		fill_pixels(dst, colors[0]);
	}
}

std::string DummyVideoProvider::MakeFilename(double fps, int frames, int width, int height, agi::Color colour, bool pattern) {
	return agi::format("?dummy:%f:%d:%d:%d:%d:%d:%d:%s", fps, frames, width, height, (int)colour.r, (int)colour.g, (int)colour.b, (pattern ? "c" : ""));
}

void DummyVideoProvider::GetFrame(int, VideoFrame &frame) {
	frame.data    = data;
	frame.width   = width;
	frame.height  = height;
	frame.pitch   = width * 4;
	frame.flipped = false;
}

namespace agi { class BackgroundRunner; }
std::unique_ptr<VideoProvider> CreateDummyVideoProvider(agi::fs::path const& filename, std::string const&, agi::BackgroundRunner *) {
	if (!boost::starts_with(filename.string(), "?dummy"))
		return {};

	std::vector<std::string> toks;
	auto const& fields = filename.string().substr(7);
	boost::split(toks, fields, [](char c) { return c == ':'; });
	if (toks.size() != 8)
		throw VideoOpenError("Too few fields in dummy video parameter list");

	size_t i = 0;
	double fps;
	int frames, width, height, red, green, blue;

	using agi::util::try_parse;
	if (!try_parse(toks[i++], &fps))    throw VideoOpenError("Unable to parse fps field in dummy video parameter list");
	if (!try_parse(toks[i++], &frames)) throw VideoOpenError("Unable to parse framecount field in dummy video parameter list");
	if (!try_parse(toks[i++], &width))  throw VideoOpenError("Unable to parse width field in dummy video parameter list");
	if (!try_parse(toks[i++], &height)) throw VideoOpenError("Unable to parse height field in dummy video parameter list");
	if (!try_parse(toks[i++], &red))    throw VideoOpenError("Unable to parse red colour field in dummy video parameter list");
	if (!try_parse(toks[i++], &green))  throw VideoOpenError("Unable to parse green colour field in dummy video parameter list");
	if (!try_parse(toks[i++], &blue))   throw VideoOpenError("Unable to parse blue colour field in dummy video parameter list");

	bool pattern = toks[i] == "c";

	return agi::make_unique<DummyVideoProvider>(fps, frames, width, height, agi::Color(red, green, blue), pattern);
}