com.creactiviti.piper.plugin.ffmpeg.Vstitch.java Source code

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Here is the source code for com.creactiviti.piper.plugin.ffmpeg.Vstitch.java

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/*
 * Copyright 2016-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.creactiviti.piper.plugin.ffmpeg;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Arrays;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Component;

import com.creactiviti.piper.core.task.SimpleTaskExecution;
import com.creactiviti.piper.core.task.Task;
import com.creactiviti.piper.core.task.TaskHandler;

/**
 * a {@link TaskHandler} implementation which "stitches" together a 
 * collection of <code>chunks</code> into a single file specified by 
 * the <code>output</code> property.
 * 
 * @author Arik Cohen
 * @since Jun 4, 2017
 */
@Component
public class Vstitch implements TaskHandler<Object> {

    private final Ffmpeg ffmpeg = new Ffmpeg();

    @Override
    public Object handle(Task aTask) throws Exception {
        List<String> chunks = aTask.getList("chunks", String.class);
        File tempFile = File.createTempFile("_chunks", ".txt");
        try {
            try (Writer writer = new BufferedWriter(
                    new OutputStreamWriter(new FileOutputStream(tempFile, true), "UTF-8"))) {
                for (String chunk : chunks) {
                    writer.append(String.format("file '%s'", chunk)).append("\n");
                }
            }
            SimpleTaskExecution ffmpegTask = SimpleTaskExecution.create();
            List<String> options = Arrays.asList("-y", "-f", "concat", "-safe", "0", "-i",
                    tempFile.getAbsolutePath(), "-c", "copy", aTask.getRequiredString("output"));
            ffmpegTask.set("options", options);
            ffmpeg.handle(ffmpegTask);
        } finally {
            FileUtils.deleteQuietly(tempFile);
        }
        return null;
    }

}