Aegisub/src/subtitle_format.cpp

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// 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:
//
// * 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"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// Aegisub Project http://www.aegisub.org/
/// @file subtitle_format.cpp
/// @brief Base class for subtitle format handlers
/// @ingroup subtitle_io
///
#include "config.h"
#include "subtitle_format.h"
#include <wx/intl.h>
#include <wx/choicdlg.h> // Keep this last so wxUSE_CHOICEDLG is set.
#include "ass_attachment.h"
#include "ass_dialogue.h"
#include "ass_file.h"
#include "ass_style.h"
#include "compat.h"
#include "subtitle_format_ass.h"
#include "subtitle_format_ebu3264.h"
#include "subtitle_format_encore.h"
#include "subtitle_format_microdvd.h"
#include "subtitle_format_mkv.h"
#include "subtitle_format_srt.h"
#include "subtitle_format_transtation.h"
#include "subtitle_format_ttxt.h"
#include "subtitle_format_txt.h"
#include "video_context.h"
#include <libaegisub/fs.h>
#include <libaegisub/of_type_adaptor.h>
#include <libaegisub/util.h>
#include <algorithm>
#include <boost/algorithm/string/join.hpp>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/algorithm/string/replace.hpp>
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using namespace std::placeholders;
namespace {
std::vector<std::unique_ptr<SubtitleFormat>> formats;
}
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SubtitleFormat::SubtitleFormat(std::string name)
: name(std::move(name))
{
}
SubtitleFormat::~SubtitleFormat() { }
bool SubtitleFormat::CanReadFile(agi::fs::path const& filename, std::string const&) const {
auto wildcards = GetReadWildcards();
return any_of(begin(wildcards), end(wildcards),
[&](std::string const& ext) { return agi::fs::HasExtension(filename, ext); });
}
bool SubtitleFormat::CanWriteFile(agi::fs::path const& filename) const {
auto wildcards = GetWriteWildcards();
return any_of(begin(wildcards), end(wildcards),
[&](std::string const& ext) { return agi::fs::HasExtension(filename, ext); });
}
bool SubtitleFormat::CanSave(const AssFile *subs) const {
AssStyle defstyle;
for (auto const& line : subs->Line) {
// Check style, if anything non-default is found, return false
if (const AssStyle *curstyle = dynamic_cast<const AssStyle*>(&line)) {
if (curstyle->GetEntryData() != defstyle.GetEntryData())
return false;
}
// Check for attachments, if any is found, return false
if (dynamic_cast<const AssAttachment*>(&line)) return false;
// Check dialog
if (const AssDialogue *curdiag = dynamic_cast<const AssDialogue*>(&line)) {
if (curdiag->GetStrippedText() != curdiag->Text)
return false;
}
}
return true;
}
agi::vfr::Framerate SubtitleFormat::AskForFPS(bool allow_vfr, bool show_smpte) {
wxArrayString choices;
// Video FPS
VideoContext *context = VideoContext::Get();
bool vidLoaded = context->TimecodesLoaded();
if (vidLoaded) {
if (!context->FPS().IsVFR())
choices.Add(wxString::Format(_("From video (%g)"), context->FPS().FPS()));
else if (allow_vfr)
choices.Add(_("From video (VFR)"));
else
vidLoaded = false;
}
// Standard FPS values
choices.Add(_("15.000 FPS"));
choices.Add(_("23.976 FPS (Decimated NTSC)"));
choices.Add(_("24.000 FPS (FILM)"));
choices.Add(_("25.000 FPS (PAL)"));
choices.Add(_("29.970 FPS (NTSC)"));
if (show_smpte)
choices.Add(_("29.970 FPS (NTSC with SMPTE dropframe)"));
choices.Add(_("30.000 FPS"));
choices.Add(_("50.000 FPS (PAL x2)"));
choices.Add(_("59.940 FPS (NTSC x2)"));
choices.Add(_("60.000 FPS"));
choices.Add(_("119.880 FPS (NTSC x4)"));
choices.Add(_("120.000 FPS"));
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bool was_busy = wxIsBusy();
if (was_busy) wxEndBusyCursor();
int choice = wxGetSingleChoiceIndex(_("Please choose the appropriate FPS for the subtitles:"), _("FPS"), choices);
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if (was_busy) wxBeginBusyCursor();
using agi::vfr::Framerate;
if (choice == -1)
return Framerate();
// Get FPS from choice
if (vidLoaded)
--choice;
if (!show_smpte && choice > 4)
--choice;
switch (choice) {
case -1: return context->FPS(); break; // VIDEO
case 0: return Framerate(15, 1); break;
case 1: return Framerate(24000, 1001); break;
case 2: return Framerate(24, 1); break;
case 3: return Framerate(25, 1); break;
case 4: return Framerate(30000, 1001); break;
case 5: return Framerate(30000, 1001, true); break;
case 6: return Framerate(30, 1); break;
case 7: return Framerate(50, 1); break;
case 8: return Framerate(60000, 1001); break;
case 9: return Framerate(60, 1); break;
case 10: return Framerate(120000, 1001); break;
case 11: return Framerate(120, 1); break;
}
assert(false);
return Framerate();
}
void SubtitleFormat::StripTags(AssFile &file) {
for (auto current : file.Line | agi::of_type<AssDialogue>())
current->StripTags();
}
void SubtitleFormat::ConvertNewlines(AssFile &file, std::string const& newline, bool mergeLineBreaks) {
for (auto current : file.Line | agi::of_type<AssDialogue>()) {
std::string repl = current->Text;
boost::replace_all(repl, "\\h", " ");
boost::ireplace_all(repl, "\\n", newline);
if (mergeLineBreaks) {
std::string dbl(newline + newline);
size_t pos = 0;
while ((pos = repl.find(dbl, pos)) != std::string::npos)
boost::replace_all(repl, dbl, newline);
}
current->Text = repl;
}
}
void SubtitleFormat::StripComments(AssFile &file) {
file.Line.remove_and_dispose_if([](AssEntry const& e) {
const AssDialogue *diag = dynamic_cast<const AssDialogue*>(&e);
return diag && (diag->Comment || diag->Text.get().empty());
}, [](AssEntry *e) { delete e; });
}
void SubtitleFormat::StripNonDialogue(AssFile &file) {
file.Line.remove_and_dispose_if([](AssEntry const& e) {
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return e.Group() != AssEntryGroup::DIALOGUE;
}, [](AssEntry *e) { delete e; });
}
static bool dialog_start_lt(AssEntry &pos, AssDialogue *to_insert) {
AssDialogue *diag = dynamic_cast<AssDialogue*>(&pos);
return diag && diag->Start > to_insert->Start;
}
/// @brief Split and merge lines so there are no overlapping lines
///
/// Algorithm described at http://devel.aegisub.org/wiki/Technical/SplitMerge
void SubtitleFormat::RecombineOverlaps(AssFile &file) {
entryIter cur, next = file.Line.begin();
cur = next++;
for (; next != file.Line.end(); cur = next++) {
AssDialogue *prevdlg = dynamic_cast<AssDialogue*>(&*cur);
AssDialogue *curdlg = dynamic_cast<AssDialogue*>(&*next);
if (!curdlg || !prevdlg) continue;
if (prevdlg->End <= curdlg->Start) continue;
// Use names like in the algorithm description and prepare for erasing
// old dialogues from the list
entryIter prev = cur;
cur = next;
next++;
// std::list::insert() inserts items before the given iterator, so
// we need 'next' for inserting. 'prev' and 'cur' can safely be erased
// from the list now.
file.Line.erase(prev);
file.Line.erase(cur);
//Is there an A part before the overlap?
if (curdlg->Start > prevdlg->Start) {
// Produce new entry with correct values
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auto newdlg = new AssDialogue(*prevdlg);
newdlg->Start = prevdlg->Start;
newdlg->End = curdlg->Start;
newdlg->Text = prevdlg->Text;
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file.Line.insert(find_if(next, file.Line.end(), std::bind(dialog_start_lt, _1, newdlg)), *newdlg);
}
// Overlapping A+B part
{
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auto newdlg = new AssDialogue(*prevdlg);
newdlg->Start = curdlg->Start;
newdlg->End = (prevdlg->End < curdlg->End) ? prevdlg->End : curdlg->End;
// Put an ASS format hard linewrap between lines
newdlg->Text = curdlg->Text.get() + "\\N" + prevdlg->Text.get();
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file.Line.insert(find_if(next, file.Line.end(), std::bind(dialog_start_lt, _1, newdlg)), *newdlg);
}
// Is there an A part after the overlap?
if (prevdlg->End > curdlg->End) {
// Produce new entry with correct values
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auto newdlg = new AssDialogue(*prevdlg);
newdlg->Start = curdlg->End;
newdlg->End = prevdlg->End;
newdlg->Text = prevdlg->Text;
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file.Line.insert(find_if(next, file.Line.end(), std::bind(dialog_start_lt, _1, newdlg)), *newdlg);
}
// Is there a B part after the overlap?
if (curdlg->End > prevdlg->End) {
// Produce new entry with correct values
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auto newdlg = new AssDialogue(*prevdlg);
newdlg->Start = prevdlg->End;
newdlg->End = curdlg->End;
newdlg->Text = curdlg->Text;
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file.Line.insert(find_if(next, file.Line.end(), std::bind(dialog_start_lt, _1, newdlg)), *newdlg);
}
next--;
}
}
/// @brief Merge identical lines that follow each other
void SubtitleFormat::MergeIdentical(AssFile &file) {
entryIter cur, next = file.Line.begin();
cur = next++;
for (; next != file.Line.end(); cur = next++) {
AssDialogue *curdlg = dynamic_cast<AssDialogue*>(&*cur);
AssDialogue *nextdlg = dynamic_cast<AssDialogue*>(&*next);
if (curdlg && nextdlg && curdlg->End == nextdlg->Start && curdlg->Text == nextdlg->Text) {
// Merge timing
nextdlg->Start = std::min(nextdlg->Start, curdlg->Start);
nextdlg->End = std::max(nextdlg->End, curdlg->End);
// Remove duplicate line
delete curdlg;
}
}
}
void SubtitleFormat::LoadFormats() {
if (formats.empty()) {
formats.emplace_back(agi::util::make_unique<AssSubtitleFormat>());
formats.emplace_back(agi::util::make_unique<Ebu3264SubtitleFormat>());
formats.emplace_back(agi::util::make_unique<EncoreSubtitleFormat>());
formats.emplace_back(agi::util::make_unique<MKVSubtitleFormat>());
formats.emplace_back(agi::util::make_unique<MicroDVDSubtitleFormat>());
formats.emplace_back(agi::util::make_unique<SRTSubtitleFormat>());
formats.emplace_back(agi::util::make_unique<TTXTSubtitleFormat>());
formats.emplace_back(agi::util::make_unique<TXTSubtitleFormat>());
formats.emplace_back(agi::util::make_unique<TranStationSubtitleFormat>());
}
}
template<class Cont, class Pred>
SubtitleFormat *find_or_throw(Cont &container, Pred pred) {
auto it = find_if(container.begin(), container.end(), pred);
if (it == container.end())
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throw UnknownSubtitleFormatError("Subtitle format for extension not found", nullptr);
return it->get();
}
const SubtitleFormat *SubtitleFormat::GetReader(agi::fs::path const& filename, std::string const& encoding) {
LoadFormats();
return find_or_throw(formats, std::bind(&SubtitleFormat::CanReadFile, _1, filename, encoding));
}
const SubtitleFormat *SubtitleFormat::GetWriter(agi::fs::path const& filename) {
LoadFormats();
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return find_or_throw(formats, std::bind(&SubtitleFormat::CanWriteFile, _1, filename));
}
std::string SubtitleFormat::GetWildcards(int mode) {
LoadFormats();
std::vector<std::string> all;
std::string final;
for (auto const& format : formats) {
auto cur = mode == 0 ? format->GetReadWildcards() : format->GetWriteWildcards();
if (cur.empty()) continue;
for (auto& str : cur) str.insert(0, "*.");
all.insert(all.end(), begin(cur), end(cur));
final += "|" + format->GetName() + " (" + boost::join(cur, ",") + ")|" + boost::join(cur, ";");
}
return from_wx(_("All Supported Formats")) + " (" + boost::join(all, ",") + ")|" + boost::join(all, ";") + final;
}