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

Introduction

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

Source

/*
 * 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.File;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.commons.exec.CommandLine;
import org.apache.commons.exec.DefaultExecutor;
import org.apache.commons.exec.ExecuteException;
import org.apache.commons.exec.PumpStreamHandler;
import org.apache.commons.io.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import com.creactiviti.piper.core.task.Task;
import com.creactiviti.piper.core.task.TaskHandler;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * Executes an ffprobe command on a given input. 
 * 
 * @author Arik Cohen
 * @since May 23, 2017
 */
@Component
public class Ffprobe implements TaskHandler<Map<String, Object>> {

    private final Logger log = LoggerFactory.getLogger(getClass());
    private final ObjectMapper json = new ObjectMapper();

    @Override
    public Map<String, Object> handle(Task aTask) throws Exception {
        CommandLine cmd = new CommandLine("ffprobe");
        cmd.addArgument("-v").addArgument("quiet").addArgument("-print_format").addArgument("json")
                .addArgument("-show_error").addArgument("-show_format").addArgument("-show_streams")
                .addArgument(aTask.getRequiredString("input"));
        log.debug("{}", cmd);
        DefaultExecutor exec = new DefaultExecutor();
        File tempFile = File.createTempFile("log", null);
        try (PrintStream stream = new PrintStream(tempFile);) {
            exec.setStreamHandler(new PumpStreamHandler(stream));
            exec.execute(cmd);
            return parse(FileUtils.readFileToString(tempFile));
        } catch (ExecuteException e) {
            throw new ExecuteException(e.getMessage(), e.getExitValue(),
                    new RuntimeException(FileUtils.readFileToString(tempFile)));
        } finally {
            FileUtils.deleteQuietly(tempFile);
        }
    }

    private Map<String, Object> parse(String aJson) throws Exception {
        Map<String, Object> result = json.readValue(aJson, Map.class);
        ArrayList<Object> video = new ArrayList<>();
        ArrayList<Object> audio = new ArrayList<>();
        result.put("video", video);
        result.put("audio", audio);
        List<Map<String, Object>> streams = (List<Map<String, Object>>) result.get("streams");
        for (int i = 0; streams != null && i < streams.size(); i++) {
            Map<String, Object> stream = streams.get(i);
            if ("video".equals(stream.get("codec_type"))) {
                video.add(stream);
            } else if ("audio".equals(stream.get("codec_type"))) {
                audio.add(stream);
            }
        }
        return result;
    }

}