Aegisub/aegisub/src/subtitle_format_ttxt.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:
//
//   * Redistributions of source code must retain the above copyright notice,
//     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
//     and/or other materials provided with the distribution.
//   * 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.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// Aegisub Project http://www.aegisub.org/
//
// $Id$

/// @file subtitle_format_ttxt.cpp
/// @brief Reading/writing MPEG-4 Timed Text subtitles in TTXT XML format
/// @ingroup subtitle_io
///

#include "config.h"

#include "subtitle_format_ttxt.h"

#include "ass_dialogue.h"
#include "ass_file.h"
#include "ass_time.h"
#include "compat.h"
#include "main.h"

DEFINE_SIMPLE_EXCEPTION(TTXTParseError, SubtitleFormatParseError, "subtitle_io/parse/ttxt")

TTXTSubtitleFormat::TTXTSubtitleFormat()
: SubtitleFormat("MPEG-4 Streaming Text")
{
}

wxArrayString TTXTSubtitleFormat::GetReadWildcards() const {
	wxArrayString formats;
	formats.Add("ttxt");
	return formats;
}

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

void TTXTSubtitleFormat::ReadFile(wxString const& filename, wxString const& forceEncoding) {
	LoadDefault(false);

	// Load XML document
	wxXmlDocument doc;
	if (!doc.Load(filename)) throw TTXTParseError("Failed loading TTXT XML file.", 0);

	// Check root node name
	if (doc.GetRoot()->GetName() != "TextStream") throw TTXTParseError("Invalid TTXT file.", 0);

	// Check version
	wxString verStr = doc.GetRoot()->GetAttribute("version", "");
	version = -1;
	if (verStr == "1.0") version = 0;
	else if (verStr == "1.1") version = 1;
	else throw TTXTParseError("Unknown TTXT version: " + STD_STR(verStr), 0);

	// Get children
	diag = NULL;
	wxXmlNode *child = doc.GetRoot()->GetChildren();
	int lines = 0;
	while (child) {
		// Line
		if (child->GetName() == "TextSample") {
			if (ProcessLine(child)) lines++;
		}

		// Header
		else if (child->GetName() == "TextStreamHeader") {
			ProcessHeader(child);
		}

		// Proceed to next child
		child = child->GetNext();
	}

	// No lines?
	if (lines == 0) {
		AssDialogue *line = new AssDialogue();
		line->group = "[Events]";
		line->Style = "Default";
		line->Start = 0;
		line->End = 5000;
		Line->push_back(line);
	}
}

bool TTXTSubtitleFormat::ProcessLine(wxXmlNode *node) {
	// Get time
	wxString sampleTime = node->GetAttribute("sampleTime", "00:00:00.000");
	AssTime time;
	time.ParseASS(sampleTime);

	// Set end time of last line
	if (diag) diag->End = time;
	diag = NULL;

	// Get text
	wxString text;
	if (version == 0) text = node->GetAttribute("text", "");
	else text = node->GetNodeContent();

	// Create line
	if (!text.IsEmpty()) {
		// Create dialogue
		diag = new AssDialogue();
		diag->Start = time;
		diag->End = 36000000-10;
		diag->group = "[Events]";
		diag->Style = "Default";
		diag->Comment = false;

		// Process text for 1.0
		if (version == 0) {
			wxString finalText;
			finalText.Alloc(text.Length());
			bool in = false;
			bool first = true;
			for (size_t i=0;i<text.Length();i++) {
				if (text[i] == '\'') {
					if (!in && !first) finalText += "\\N";
					first = false;
					in = !in;
				}
				else if (in) finalText += text[i];
			}
			diag->Text = finalText;
		}

		// Process text for 1.1
		else {
			text.Replace("\r", "");
			text.Replace("\n", "\\N");
			diag->Text = text;
		}

		// Insert dialogue
		Line->push_back(diag);
		return true;
	}

	else return false;
}

void TTXTSubtitleFormat::ProcessHeader(wxXmlNode *node) {
	// TODO
}

void TTXTSubtitleFormat::WriteFile(wxString const& filename, wxString const& encoding) {
	// Convert to TTXT
	CreateCopy();
	ConvertToTTXT();

	// Create XML structure
	wxXmlDocument doc;
	wxXmlNode *root = new wxXmlNode(NULL, wxXML_ELEMENT_NODE, "TextStream");
	root->AddAttribute("version", "1.1");
	doc.SetRoot(root);

	// Create header
	WriteHeader(root);

	// Create lines
	int i=1;
	using std::list;
	prev = NULL;
	for (list<AssEntry*>::iterator cur=Line->begin();cur!=Line->end();cur++) {
		AssDialogue *current = dynamic_cast<AssDialogue*>(*cur);
		if (current && !current->Comment) {
			WriteLine(root, current);
			i++;
		}
		else
			throw TTXTParseError("Unexpected line type in TTXT file", 0);
	}

	// Save XML
	//prevNode->SetNext(NULL);
	doc.Save(filename);

	// Clear
	ClearCopy();
}

void TTXTSubtitleFormat::WriteHeader(wxXmlNode *root) {
	// Write stream header
	wxXmlNode *node = new wxXmlNode(wxXML_ELEMENT_NODE, "TextStreamHeader");
	node->AddAttribute("width", "400");
	node->AddAttribute("height", "60");
	node->AddAttribute("layer", "0");
	node->AddAttribute("translation_x", "0");
	node->AddAttribute("translation_y", "0");
	root->AddChild(node);
	root = node;

	// Write sample description
	node = new wxXmlNode(wxXML_ELEMENT_NODE, "TextSampleDescription");
	node->AddAttribute("horizontalJustification", "center");
	node->AddAttribute("verticalJustification", "bottom");
	node->AddAttribute("backColor", "0 0 0 0");
	node->AddAttribute("verticalText", "no");
	node->AddAttribute("fillTextRegion", "no");
	node->AddAttribute("continuousKaraoke", "no");
	node->AddAttribute("scroll", "None");
	root->AddChild(node);
	root = node;

	// Write font table
	node = new wxXmlNode(wxXML_ELEMENT_NODE, "FontTable");
	wxXmlNode *subNode = new wxXmlNode(wxXML_ELEMENT_NODE, "FontTableEntry");
	subNode->AddAttribute("fontName", "Sans");
	subNode->AddAttribute("fontID", "1");
	node->AddChild(subNode);
	root->AddChild(node);
	
	// Write text box
	node = new wxXmlNode(wxXML_ELEMENT_NODE, "TextBox");
	node->AddAttribute("top", "0");
	node->AddAttribute("left", "0");
	node->AddAttribute("bottom", "60");
	node->AddAttribute("right", "400");
	root->AddChild(node);

	// Write style
	node = new wxXmlNode(wxXML_ELEMENT_NODE, "Style");
	node->AddAttribute("styles", "Normal");
	node->AddAttribute("fontID", "1");
	node->AddAttribute("fontSize", "18");
	node->AddAttribute("color", "ff ff ff ff");
	root->AddChild(node);
}

void TTXTSubtitleFormat::WriteLine(wxXmlNode *root, AssDialogue *line) {
	// If it doesn't start at the end of previous, add blank
	wxXmlNode *node, *subNode;
	if (prev && prev->End != line->Start) {
		node = new wxXmlNode(wxXML_ELEMENT_NODE, "TextSample");
		node->AddAttribute("sampleTime", "0" + prev->End.GetASSFormated(true));
		node->AddAttribute("xml:space", "preserve");
		subNode = new wxXmlNode(wxXML_TEXT_NODE, "", "");
		node->AddChild(subNode);
		root->AddChild(node);
	}

	// Generate and insert node
	node = new wxXmlNode(wxXML_ELEMENT_NODE, "TextSample");
	node->AddAttribute("sampleTime", "0" + line->Start.GetASSFormated(true));
	node->AddAttribute("xml:space", "preserve");
	subNode = new wxXmlNode(wxXML_TEXT_NODE, "", line->Text);
	node->AddChild(subNode);
	root->AddChild(node);

	// Set as previous
	prev = line;
}

void TTXTSubtitleFormat::ConvertToTTXT () {
	SortLines();
	StripComments();
	RecombineOverlaps();
	MergeIdentical();
	StripTags();
	ConvertNewlines("\r\n");

	// Find last line
	AssTime lastTime;
	for (std::list<AssEntry*>::reverse_iterator cur=Line->rbegin();cur!=Line->rend();cur++) {
		if (AssDialogue *prev = dynamic_cast<AssDialogue*>(*cur)) {
			lastTime = prev->End;
			break;
		}
	}

	// Insert blank line at the end
	AssDialogue *diag = new AssDialogue();
	diag->Start = lastTime;
	diag->End = lastTime+OPT_GET("Timing/Default Duration")->GetInt();
	diag->group = "[Events]";
	diag->Style = "Default";
	diag->Comment = false;
	Line->push_back(diag);
}