Adds converter modules and sorters

Converters are now the result of combining multiple modules, and running them in the selected sequence. I hope to be able to completely remove converters by replacing them with templates that simply run some modules in a sequence, before running FFmpeg. Then I want to be able to parse a command into a template, so users have full control of what a template does.

Sorters each sort a list of streams after a single criteria. They can be chained in order to create complex chained sorters.

src/main/java/net/knarcraft/ffmpegconverter/converter/WebAnimeConverter.java

@@ -0,0 +1,119 @@
+package net.knarcraft.ffmpegconverter.converter;
+
+import net.knarcraft.ffmpegconverter.container.FFMpegCommand;
+import net.knarcraft.ffmpegconverter.container.StreamProbeResult;
+import net.knarcraft.ffmpegconverter.converter.module.ConverterModule;
+import net.knarcraft.ffmpegconverter.converter.module.DebugModule;
+import net.knarcraft.ffmpegconverter.converter.module.ModuleExecutor;
+import net.knarcraft.ffmpegconverter.converter.module.mapping.AddStereoAudioStreamModule;
+import net.knarcraft.ffmpegconverter.converter.module.mapping.BurnSubtitleModule;
+import net.knarcraft.ffmpegconverter.converter.module.mapping.SelectSingleStreamModule;
+import net.knarcraft.ffmpegconverter.converter.sorter.AudioLanguageSorter;
+import net.knarcraft.ffmpegconverter.converter.sorter.MinimalSubtitleSorter;
+import net.knarcraft.ffmpegconverter.converter.sorter.StreamSorter;
+import net.knarcraft.ffmpegconverter.converter.sorter.SubtitleLanguageSorter;
+import net.knarcraft.ffmpegconverter.converter.sorter.SubtitleTitleSorter;
+import net.knarcraft.ffmpegconverter.property.MinimalSubtitlePreference;
+import net.knarcraft.ffmpegconverter.streams.AudioStream;
+import net.knarcraft.ffmpegconverter.streams.SubtitleStream;
+import net.knarcraft.ffmpegconverter.streams.VideoStream;
+import net.knarcraft.ffmpegconverter.utility.FFMpegHelper;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static net.knarcraft.ffmpegconverter.utility.FFMpegHelper.getNthSteam;
+
+/**
+ * A converter mainly designed for converting anime to web-playable mp4
+ */
+public class WebAnimeConverter extends AbstractConverter {
+
+    private final String[] audioLanguages;
+    private final String[] subtitleLanguages;
+    private final boolean toStereo;
+    private final MinimalSubtitlePreference subtitlePreference;
+    private final int forcedAudioIndex;
+    private final int forcedSubtitleIndex;
+    private final String subtitleNameFilter;
+
+    /**
+     * Instantiates a new anime converter
+     *
+     * @param ffprobePath         <p>Path/command to ffprobe.</p>
+     * @param ffmpegPath          <p>Path/command to ffmpeg.</p>
+     * @param audioLanguages      <p>List of wanted audio languages in descending order.</p>
+     * @param subtitleLanguages   <p>List of wanted subtitle languages in descending order.</p>
+     * @param toStereo            <p>Convert video with several audio channels to stereo.</p>
+     * @param subtitlePreference  <p>How minimal subtitles should be prioritized</p>
+     * @param forcedAudioIndex    <p>A specific audio stream to force. 0-indexed from the first audio stream found</p>
+     * @param forcedSubtitleIndex <p>A specific subtitle stream to force. 0-indexed for the first subtitle stream found</p>
+     */
+    public WebAnimeConverter(@NotNull String ffprobePath, @NotNull String ffmpegPath, @NotNull String[] audioLanguages,
+                             @NotNull String[] subtitleLanguages, boolean toStereo,
+                             @NotNull MinimalSubtitlePreference subtitlePreference, int forcedAudioIndex,
+                             int forcedSubtitleIndex, @NotNull String subtitleNameFilter) {
+        super("mp4");
+        this.ffprobePath = ffprobePath;
+        this.ffmpegPath = ffmpegPath;
+        this.audioLanguages = audioLanguages;
+        this.subtitleLanguages = subtitleLanguages;
+        this.toStereo = toStereo;
+        this.subtitlePreference = subtitlePreference;
+        this.forcedAudioIndex = forcedAudioIndex;
+        this.forcedSubtitleIndex = forcedSubtitleIndex;
+        this.subtitleNameFilter = subtitleNameFilter;
+    }
+
+    @Override
+    public String[] generateConversionCommand(@NotNull String executable, @NotNull StreamProbeResult probeResult,
+                                              @NotNull String outFile) {
+        FFMpegCommand command = FFMpegHelper.getFFMpegWebVideoCommand(executable, probeResult.parsedFiles());
+        List<ConverterModule> modules = new ArrayList<>();
+        if (this.debug) {
+            modules.add(new DebugModule(0, 0));
+            FFMpegHelper.addDebugArguments(command, 50, 120);
+        }
+
+        //Get the first audio stream in accordance with chosen languages
+        AudioStream audioStream = getNthSteam(new AudioLanguageSorter(this.audioLanguages).sort(
+                probeResult.getAudioStreams()), this.forcedAudioIndex);
+        if (audioStream == null) {
+            throw new IllegalArgumentException("The given input resulted in no audio stream being selected");
+        }
+        if (this.toStereo) {
+            modules.add(new AddStereoAudioStreamModule(audioStream, true));
+        } else {
+            modules.add(new SelectSingleStreamModule(audioStream));
+        }
+
+        //Get the first video stream
+        VideoStream videoStream = getNthSteam(probeResult.getVideoStreams(), 0);
+
+        //Get the first subtitle stream in accordance with chosen languages and signs and songs prevention
+        StreamSorter<SubtitleStream> subtitleSorter = new SubtitleTitleSorter(this.subtitleNameFilter)
+                .append(new MinimalSubtitleSorter(this.subtitlePreference))
+                .append(new SubtitleLanguageSorter(this.subtitleLanguages));
+        SubtitleStream subtitleStream = getNthSteam(subtitleSorter.chainSort(probeResult.getSubtitleStreams()),
+                this.forcedSubtitleIndex);
+
+        if (subtitleStream != null && videoStream != null) {
+            modules.add(new BurnSubtitleModule(subtitleStream, videoStream, true));
+        } else if (videoStream != null) {
+            modules.add(new SelectSingleStreamModule(videoStream));
+        } else {
+            throw new IllegalArgumentException("The selected video stream does not exist!");
+        }
+
+        new ModuleExecutor(command, modules).execute();
+        command.setOutputFile(outFile);
+        return command.getResult();
+    }
+
+    @Override
+    public String[] getValidFormats() {
+        return this.videoFormats;
+    }
+
+}