Aegisub/src/ass_karaoke.cpp

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// Copyright (c) 2011, Thomas Goyne <plorkyeran@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Aegisub Project http://www.aegisub.org/
#include "ass_karaoke.h"
#include "ass_dialogue.h"
#include <libaegisub/format.h>
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#include <boost/algorithm/string/predicate.hpp>
#include <boost/algorithm/string/trim.hpp>
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std::string AssKaraoke::Syllable::GetText(bool k_tag) const {
std::string ret;
if (k_tag)
ret = agi::format("{%s%d}", tag_type, ((duration + 5) / 10));
size_t idx = 0;
for (auto const& ovr : ovr_tags) {
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ret += text.substr(idx, ovr.first - idx);
ret += ovr.second;
idx = ovr.first;
}
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ret += text.substr(idx);
return ret;
}
AssKaraoke::AssKaraoke(const AssDialogue *line, bool auto_split, bool normalize) {
if (line) SetLine(line, auto_split, normalize);
}
void AssKaraoke::SetLine(const AssDialogue *line, bool auto_split, bool normalize) {
syls.clear();
Syllable syl;
syl.start_time = line->Start;
syl.duration = 0;
syl.tag_type = "\\k";
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ParseSyllables(line, syl);
if (normalize) {
// Normalize the syllables so that the total duration is equal to the line length
int end_time = line->End;
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int last_end = syl.start_time + syl.duration;
// Total duration is shorter than the line length so just extend the last
// syllable; this has no effect on rendering but is easier to work with
if (last_end < end_time)
syls.back().duration += end_time - last_end;
else if (last_end > end_time) {
// Truncate any syllables that extend past the end of the line
for (auto& syl : syls) {
if (syl.start_time > end_time) {
syl.start_time = end_time;
syl.duration = 0;
}
else {
syl.duration = std::min(syl.duration, end_time - syl.start_time);
}
}
}
}
// Add karaoke splits at each space
if (auto_split && syls.size() == 1) {
size_t pos;
no_announce = true;
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while ((pos = syls.back().text.find(' ')) != std::string::npos)
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AddSplit(syls.size() - 1, pos + 1);
no_announce = false;
}
AnnounceSyllablesChanged();
}
void AssKaraoke::ParseSyllables(const AssDialogue *line, Syllable &syl) {
for (auto& block : line->ParseTags()) {
std::string text = block->GetText();
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switch (block->GetType()) {
case AssBlockType::PLAIN:
syl.text += text;
break;
case AssBlockType::COMMENT:
// drawings aren't override tags but they shouldn't show up in the
// stripped text so pretend they are
case AssBlockType::DRAWING:
syl.ovr_tags[syl.text.size()] += text;
break;
case AssBlockType::OVERRIDE:
auto ovr = static_cast<AssDialogueBlockOverride*>(block.get());
bool in_tag = false;
for (auto& tag : ovr->Tags) {
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if (tag.IsValid() && boost::istarts_with(tag.Name, "\\k")) {
if (in_tag) {
syl.ovr_tags[syl.text.size()] += "}";
in_tag = false;
}
// Dealing with both \K and \kf is mildly annoying so just
// convert them both to \kf
if (tag.Name == "\\K") tag.Name = "\\kf";
// Don't bother including zero duration zero length syls
if (syl.duration > 0 || !syl.text.empty()) {
syls.push_back(syl);
syl.text.clear();
syl.ovr_tags.clear();
}
syl.tag_type = tag.Name;
syl.start_time += syl.duration;
syl.duration = tag.Params[0].Get(0) * 10;
}
else {
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std::string& otext = syl.ovr_tags[syl.text.size()];
// Merge adjacent override tags
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boost::trim_right_if(text, [](char c) { return c == '}'; });
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if (!in_tag)
otext += "{";
in_tag = true;
otext += tag;
}
}
if (in_tag)
syl.ovr_tags[syl.text.size()] += "}";
break;
}
}
syls.push_back(syl);
}
std::string AssKaraoke::GetText() const {
std::string text;
text.reserve(size() * 10);
for (auto const& syl : syls)
text += syl.GetText(true);
return text;
}
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std::string AssKaraoke::GetTagType() const {
return begin()->tag_type;
}
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void AssKaraoke::SetTagType(std::string const& new_type) {
for (auto& syl : syls)
syl.tag_type = new_type;
}
void AssKaraoke::AddSplit(size_t syl_idx, size_t pos) {
syls.insert(syls.begin() + syl_idx + 1, Syllable());
Syllable &syl = syls[syl_idx];
Syllable &new_syl = syls[syl_idx + 1];
// If the syl is empty or the user is adding a syllable past the last
// character then pos will be out of bounds. Doing this is a bit goofy,
// but it's sometimes required for complex karaoke scripts
if (pos < syl.text.size()) {
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new_syl.text = syl.text.substr(pos);
syl.text = syl.text.substr(0, pos);
}
if (new_syl.text.empty())
new_syl.duration = 0;
else if (syl.text.empty()) {
new_syl.duration = syl.duration;
syl.duration = 0;
}
else {
new_syl.duration = (syl.duration * new_syl.text.size() / (syl.text.size() + new_syl.text.size()) + 5) / 10 * 10;
syl.duration -= new_syl.duration;
}
assert(syl.duration >= 0);
new_syl.start_time = syl.start_time + syl.duration;
new_syl.tag_type = syl.tag_type;
// Move all override tags after the split to the new syllable and fix the indices
size_t text_len = syl.text.size();
for (auto it = syl.ovr_tags.begin(); it != syl.ovr_tags.end(); ) {
if (it->first < text_len)
++it;
else {
new_syl.ovr_tags[it->first - text_len] = it->second;
syl.ovr_tags.erase(it++);
}
}
if (!no_announce) AnnounceSyllablesChanged();
}
void AssKaraoke::RemoveSplit(size_t syl_idx) {
// Don't allow removing the first syllable
if (syl_idx == 0) return;
Syllable &syl = syls[syl_idx];
Syllable &prev = syls[syl_idx - 1];
prev.duration += syl.duration;
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for (auto const& tag : syl.ovr_tags)
prev.ovr_tags[tag.first + prev.text.size()] = tag.second;
prev.text += syl.text;
syls.erase(syls.begin() + syl_idx);
if (!no_announce) AnnounceSyllablesChanged();
}
void AssKaraoke::SetStartTime(size_t syl_idx, int time) {
// Don't allow moving the first syllable
if (syl_idx == 0) return;
Syllable &syl = syls[syl_idx];
Syllable &prev = syls[syl_idx - 1];
assert(time >= prev.start_time);
assert(time <= syl.start_time + syl.duration);
int delta = time - syl.start_time;
syl.start_time = time;
syl.duration -= delta;
prev.duration += delta;
}
void AssKaraoke::SetLineTimes(int start_time, int end_time) {
assert(end_time >= start_time);
size_t idx = 0;
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// Chop off any portion of syllables starting before the new start_time
do {
int delta = start_time - syls[idx].start_time;
syls[idx].start_time = start_time;
syls[idx].duration = std::max(0, syls[idx].duration - delta);
} while (++idx < syls.size() && syls[idx].start_time < start_time);
// And truncate any syllables ending after the new end_time
idx = syls.size() - 1;
while (syls[idx].start_time > end_time) {
syls[idx].start_time = end_time;
syls[idx].duration = 0;
--idx;
}
syls[idx].duration = end_time - syls[idx].start_time;
}