forked from mia/Aegisub
117 lines
3.4 KiB
C++
117 lines
3.4 KiB
C++
// Copyright (c) 2011, Thomas Goyne <plorkyeran@aegisub.org>
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//
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// Permission to use, copy, modify, and distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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//
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// $Id$
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/// @file keyframe.cpp
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/// @see keyframe.h
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/// @ingroup libaegisub
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///
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#include "config.h"
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#ifndef LAGI_PRE
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#include <algorithm>
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#include <fstream>
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#endif
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#include "libaegisub/io.h"
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#include "libaegisub/line_iterator.h"
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#include "libaegisub/keyframe.h"
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#include "libaegisub/vfr.h"
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static std::pair<std::vector<int>, double> agi_keyframes(std::istream &file) {
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double fps;
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std::string fps_str;
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file >> fps_str;
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file >> fps;
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if (!file.good() || fps_str != "fps")
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throw agi::keyframe::Error("FPS not found");
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std::vector<int> ret;
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std::copy(std::istream_iterator<int>(file), std::istream_iterator<int>(), std::back_inserter(ret));
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return make_pair(ret, fps);
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}
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static std::pair<std::vector<int>, double> other_keyframes(std::istream &file, char (*func)(std::string const&)) {
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int count = 0;
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std::vector<int> ret;
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agi::line_iterator<std::string> end;
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for (agi::line_iterator<std::string> iter(file); iter != end; ++iter) {
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char c = tolower(func(*iter));
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if (c == 'i') {
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ret.push_back(count++);
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}
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else if (c == 'p' || c == 'b') {
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++count;
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}
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}
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return std::make_pair(ret, 0);
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}
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char xvid(std::string const& line) {
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return line.empty() ? 0 : line[0];
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}
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char divx(std::string const& line) {
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char chrs[] = "IPB";
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for (int i = 0; i < 3; ++i) {
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std::string::size_type pos = line.find(chrs[i]);
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if (pos != line.npos)
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return line[pos];
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}
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return 0;
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}
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char x264(std::string const& line) {
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std::string::size_type pos = line.find("type:");
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if (pos == line.npos || pos + 5 >= line.size()) return 0;
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return line[pos + 5];
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}
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template<int N>
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static bool starts_with(std::string const& str, const char (&test)[N]) {
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if (str.size() < N) return false;
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return std::mismatch(str.begin(), str.begin() + N - 1, test).first == str.begin() + N - 1;
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}
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namespace agi { namespace keyframe {
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void Save(std::string const& filename, std::vector<int> const& keyframes, vfr::Framerate const& fps) {
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io::Save file(filename);
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std::ofstream& of = file.Get();
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of << "# keyframe format v1" << std::endl;
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of << "fps " << fps.FPS() << std::endl;
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std::copy(keyframes.begin(), keyframes.end(), std::ostream_iterator<int>(of, "\n"));
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}
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std::pair<std::vector<int>, double> Load(std::string const& filename) {
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std::auto_ptr<std::ifstream> file(io::Open(filename));
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std::istream &is(*file.get());
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std::string header;
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std::getline(is, header);
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if (header == "# keyframe format v1") return agi_keyframes(is);
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if (starts_with(header, "# XviD 2pass stat file")) return other_keyframes(is, xvid);
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if (starts_with(header, "##map version")) return other_keyframes(is, divx);
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if (starts_with(header, "#options:")) return other_keyframes(is, x264);
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throw Error("Unknown keyframe format");
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}
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} }
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