Makes a new abstract converter
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package net.knarcraft.ffmpegconverter.converter;
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import net.knarcraft.ffmpegconverter.streams.AudioStream;
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import net.knarcraft.ffmpegconverter.streams.StreamObject;
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import net.knarcraft.ffmpegconverter.streams.SubtitleStream;
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import net.knarcraft.ffmpegconverter.streams.VideoStream;
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import net.knarcraft.ffmpegconverter.utility.FileUtil;
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import java.io.File;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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/**
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* Implements all methods which can be useful for any implementation of a converter.
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*/
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public abstract class AbstractConverter implements Converter {
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String ffprobePath;
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String ffmpegPath;
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final boolean DEBUG = false;
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String[] audioFormats;
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String[] videoFormats;
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/**
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* Initializes variables used by the abstract converter
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*/
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AbstractConverter() {
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try {
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audioFormats = FileUtil.readFileLines("audio_formats.txt");
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videoFormats = FileUtil.readFileLines("video_formats.txt");
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} catch (IOException e) {
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e.printStackTrace();
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System.exit(1);
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}
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}
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/**
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* Gets all valid input formats for the converter
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* @return <p>A list of valid input formats</p>
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*/
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public abstract String[] getValidFormats();
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/**
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* Filters parsed streams into one of the stream types
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* @param streams <p>A list of stream objects.</p>
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* @param codecType <p>The codec type of the streams to select.</p>
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* @param <G> <p>The correct object type for the streams with the selected codec type.</p>
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* @return <p>A potentially shorter list of streams.</p>
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*/
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@SuppressWarnings("unchecked")
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static <G extends StreamObject> List<G> filterStreamsByType(List<StreamObject> streams, String codecType) {
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Iterator<StreamObject> i = streams.iterator();
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List<G> newStreams = new ArrayList<>();
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while (i.hasNext()) {
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StreamObject next = i.next();
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if (next.getCodecType().equals(codecType)) {
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newStreams.add((G) next);
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}
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}
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return newStreams;
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}
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/**
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* Filters and sorts audio streams according to chosen languages
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* @param audioStreams <p>A list of audio streams.</p>
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* @param audioLanguages <p>A list of languages.</p>
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* @return <p>A list containing just audio tracks of chosen languages, sorted in order of languages.</p>
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*/
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static List<AudioStream> filterAudioStreams(List<AudioStream> audioStreams, String[] audioLanguages) {
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List<AudioStream> filtered = new ArrayList<>();
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for (String language : audioLanguages) {
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for (AudioStream stream : audioStreams) {
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if ((stream.getLanguage() != null && stream.getLanguage().equals(language)) || language.equals("*")) {
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filtered.add(stream);
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}
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}
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//Tries to reduce execution time from n^2
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audioStreams.removeAll(filtered);
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}
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return filtered;
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}
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/**
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* Filters and sorts subtitle streams according to chosen languages
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* @param subtitleStreams <p>A list of subtitle streams.</p>
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* @param subtitleLanguages <p>A list of languages.</p>
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* @param preventSignsAndSongs <p>Whether partial subtitles should be avoided.</p>
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* @return <p>A list containing just subtitles of chosen languages, sorted in order of languages.</p>
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*/
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static List<SubtitleStream> filterSubtitleStreams(List<SubtitleStream> subtitleStreams, String[] subtitleLanguages,
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boolean preventSignsAndSongs) {
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List<SubtitleStream> filtered = new ArrayList<>();
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//Go through languages. Select all subtitles of the language
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for (String language : subtitleLanguages) {
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for (SubtitleStream stream : subtitleStreams) {
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String streamLanguage = stream.getLanguage();
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if (((streamLanguage != null && streamLanguage.equals(language)) || language.equals("*")) &&
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(!preventSignsAndSongs || stream.getIsFullSubtitle())) {
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filtered.add(stream);
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}
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}
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//Tries to reduce execution time from n^2
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subtitleStreams.removeAll(filtered);
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}
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return filtered;
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}
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/**
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* Escapes special characters which can cause trouble for ffmpeg
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* @param fileName <p>The filename to escape.</p>
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* @return <p>A filename with known special characters escaped.</p>
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*/
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private static String escapeSpecialCharactersInFileName(String fileName) {
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return fileName.replaceAll("\\\\", "\\\\\\\\\\\\\\\\")
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.replaceAll("'", "'\\\\\\\\\\\\\''")
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.replaceAll("%", "\\\\\\\\\\\\%")
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.replaceAll(":", "\\\\\\\\\\\\:")
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.replace("]", "\\]")
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.replace("[", "\\[");
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}
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/**
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* Adds audio to a command
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* @param command <p>The command to add audio to.</p>
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* @param audioStream <p>The audio stream to be added.</p>
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* @param toStereo <p>Whether to convert the audio stream to stereo.</p>
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*/
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void addAudioStreams(List<String> command, AudioStream audioStream, boolean toStereo) {
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if (audioStream != null) {
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command.add("-map");
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command.add("0:" + audioStream.getAbsoluteIndex());
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if (toStereo && audioStream.getChannels() > 2) {
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command.add("-af");
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command.add("pan=stereo|FL=FC+0.30*FL+0.30*BL|FR=FC+0.30*FR+0.30*BR");
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}
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}
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}
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/**
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* Adds subtitles and video mapping to a command
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* @param command <p>The list containing the rest of the command.</p>
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* @param subtitleStream <p>The subtitle stream to be used.</p>
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* @param videoStream <p>The video stream to be used.</p>
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* @param file <p>The file to convert.</p>
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*/
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void addSubtitles(List<String> command, SubtitleStream subtitleStream, VideoStream videoStream, File file) {
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//No appropriate subtitle was found. Just add the video stream.
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if (subtitleStream == null) {
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command.add("-map");
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command.add(String.format("0:%d", videoStream.getAbsoluteIndex()));
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return;
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}
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if (!subtitleStream.getIsImageSubtitle()) {
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addSubtitle(command, subtitleStream, videoStream);
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} else if (file.getName().equals(subtitleStream.getFile())) {
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addInternalImageSubtitle(command, subtitleStream, videoStream);
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} else {
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addExternalImageSubtitle(command, subtitleStream, videoStream);
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}
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}
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/**
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* Adds subtitle commands to a command list
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* @param command <p>The list containing the FFmpeg commands.</p>
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* @param subtitleStream <p>The subtitle stream to add.</p>
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* @param videoStream <p>The video stream to burn the subtitle into.</p>
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*/
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private void addSubtitle(List<String> command, SubtitleStream subtitleStream, VideoStream videoStream) {
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command.add("-map");
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command.add(String.format("0:%d", videoStream.getAbsoluteIndex()));
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command.add("-vf");
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String safeFileName = escapeSpecialCharactersInFileName(subtitleStream.getFile());
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String subtitleCommand = String.format("subtitles='%s':si=%d", safeFileName,
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subtitleStream.getRelativeIndex());
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command.add(subtitleCommand);
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}
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/**
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* Adds image subtitle commands to a command list
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* @param command <p>The list containing the FFmpeg commands.</p>
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* @param subtitleStream <p>The subtitle stream to add.</p>
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* @param videoStream <p>The video stream to burn the subtitle into.</p>
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*/
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private void addInternalImageSubtitle(List<String> command, SubtitleStream subtitleStream, VideoStream videoStream) {
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command.add("-filter_complex");
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String filter = String.format("[0:v:%d][0:%d]overlay", videoStream.getAbsoluteIndex(),
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subtitleStream.getAbsoluteIndex());
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command.add(filter);
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}
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/**
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* Adds external image subtitle commands to a command list
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* @param command <p>The list containing the FFmpeg commands.</p>
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* @param externalImageSubtitle <p>The external image subtitle stream to add.</p>
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* @param videoStream <p>The video stream to burn the subtitle into.</p>
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*/
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private void addExternalImageSubtitle(List<String> command, SubtitleStream externalImageSubtitle,
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VideoStream videoStream) {
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command.add("-i");
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command.add(externalImageSubtitle.getFile());
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command.add("-filter_complex");
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command.add(String.format("[1:s]scale=width=%d:height=%d,crop=w=%d:h=%d:x=0:y=out_h[sub];[%d:v]" +
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"[sub]overlay", videoStream.getWidth(), videoStream.getHeight(), videoStream.getWidth(),
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videoStream.getHeight(), videoStream.getAbsoluteIndex()));
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command.add("-profile:v");
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command.add("baseline");
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}
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}
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