Aegisub/aegisub/src/subtitle_format_microdvd.cpp

// Copyright (c) 2006, 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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/// @file subtitle_format_microdvd.cpp
/// @brief Reading/writing MicroDVD subtitle format (.SUB)
/// @ingroup subtitle_io
///

#include "config.h"

#include "subtitle_format_microdvd.h"

#ifndef AGI_PRE
#include <wx/regex.h>
#endif

#include "ass_dialogue.h"
#include "ass_file.h"
#include "ass_time.h"
#include "text_file_reader.h"
#include "text_file_writer.h"
#include "video_context.h"

MicroDVDSubtitleFormat::MicroDVDSubtitleFormat()
: SubtitleFormat("MicroDVD")
{
}

wxArrayString MicroDVDSubtitleFormat::GetReadWildcards() const {
	wxArrayString formats;
	formats.Add("sub");
	return formats;
}

wxArrayString MicroDVDSubtitleFormat::GetWriteWildcards() const {
	return GetReadWildcards();
}

bool MicroDVDSubtitleFormat::CanReadFile(wxString const& filename) const {
	// Return false immediately if extension is wrong
	if (filename.Right(4).Lower() != ".sub") return false;

	// Since there is an infinity of .sub formats, load first line and check if it's valid
	TextFileReader file(filename);
	if (file.HasMoreLines()) {
		wxRegEx exp("^[\\{\\[]([0-9]+)[\\}\\]][\\{\\[]([0-9]+)[\\}\\]](.*)$", wxRE_ADVANCED);
		return exp.Matches(file.ReadLineFromFile());
	}

	return false;
}

void MicroDVDSubtitleFormat::ReadFile(AssFile *target, wxString const& filename, wxString const& encoding) const {
	TextFileReader file(filename, encoding);
	wxRegEx exp("^[\\{\\[]([0-9]+)[\\}\\]][\\{\\[]([0-9]+)[\\}\\]](.*)$", wxRE_ADVANCED);

	target->LoadDefault(false);

	agi::vfr::Framerate fps;

	bool isFirst = true;
	while (file.HasMoreLines()) {
		wxString line = file.ReadLineFromFile();
		if (exp.Matches(line)) {
			long f1, f2;
			exp.GetMatch(line, 1).ToLong(&f1);
			exp.GetMatch(line, 2).ToLong(&f2);
			wxString text = exp.GetMatch(line, 3);

			// If it's the first, check if it contains fps information
			if (isFirst) {
				isFirst = false;

				if (f1 == 1 && f2 == 1) {
					// Convert fps
					double cfr;
					if (text.ToDouble(&cfr)) {
						fps = cfr;
						continue;
					}
				}

				// If it wasn't an fps line, ask the user for it
				fps = AskForFPS(true, false);
				if (!fps.IsLoaded()) return;
			}

			text.Replace("|", "\\N");

			AssDialogue *diag = new AssDialogue;
			diag->Start = fps.TimeAtFrame(f1, agi::vfr::START);
			diag->End = fps.TimeAtFrame(f2, agi::vfr::END);
			diag->Text = text;
			target->Line.push_back(*diag);
		}
	}
}

void MicroDVDSubtitleFormat::WriteFile(const AssFile *src, wxString const& filename, wxString const& encoding) const {
	agi::vfr::Framerate fps = AskForFPS(true, false);
	if (!fps.IsLoaded()) return;

	AssFile copy(*src);
	copy.Sort();
	StripComments(copy);
	RecombineOverlaps(copy);
	MergeIdentical(copy);
	StripTags(copy);
	ConvertNewlines(copy, "|");

	TextFileWriter file(filename, encoding);

	// Write FPS line
	if (!fps.IsVFR()) {
		file.WriteLineToFile(wxString::Format("{1}{1}%.6f", fps.FPS()));
	}

	// Write lines
	for (auto const& line : copy.Line) {
		if (const AssDialogue *current = dynamic_cast<const AssDialogue*>(&line)) {
			int start = fps.FrameAtTime(current->Start, agi::vfr::START);
			int end = fps.FrameAtTime(current->End, agi::vfr::END);

			file.WriteLineToFile(wxString::Format("{%i}{%i}%s", start, end, current->Text));
		}
	}
}