实例介绍
【实例简介】
【实例截图】
下图是合并后的结果
【核心代码】
import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.RandomAccessFile; import java.nio.ByteBuffer; import java.nio.channels.Channels; import java.nio.channels.FileChannel; import java.nio.channels.ReadableByteChannel; import java.nio.channels.WritableByteChannel; import java.util.Arrays; import java.util.LinkedList; import java.util.List; import com.coremedia.iso.IsoFile; import com.coremedia.iso.boxes.Container; import com.coremedia.iso.boxes.TimeToSampleBox; import com.googlecode.mp4parser.DataSource; import com.googlecode.mp4parser.authoring.Movie; import com.googlecode.mp4parser.authoring.Track; import com.googlecode.mp4parser.authoring.builder.DefaultMp4Builder; import com.googlecode.mp4parser.authoring.container.mp4.MovieCreator; import com.googlecode.mp4parser.authoring.tracks.AppendTrack; import com.googlecode.mp4parser.authoring.tracks.CroppedTrack; /* * Copyright (C) 2012 The Android Open Source Project * * 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. */ // Modified example based on mp4parser google code open source project. // http://code.google.com/p/mp4parser/source/browse/trunk/examples/src/main/java/com/googlecode/mp4parser/ShortenExample.java /** * Shortens/Crops a track */ public class ShortenExample { public static void main(String args[]){ try { //startTrim(new File("D:\\Mp4\\Wonders_of_Nature.mp4"),new File("D:\\Mp4\\new.mp4"),17000,35000); //startTrim(new File("D:\\Mp4\\test.mp4"),new File("D:\\Mp4\\test1.mp4"),3000,7000); //appendVideo(new String[]{"D:\\Mp4\\begin.mp4","D:\\Mp4\\end.mp4","D:\\Mp4\\append1.mp4"}); appendVideo(new String[]{"D:\\Mp4\\test.mp4","D:\\Mp4\\test1.mp4"}); } catch (IOException e) { e.printStackTrace(); } } public static void startTrim(File src, File dst, int startMs, int endMs) throws IOException { //ReadableByteChannel in = Channels.newChannel((new FileInputStream(src))); Movie movie = MovieCreator.build("D:\\Mp4\\test.mp4"); //RandomAccessFile randomAccessFile = new RandomAccessFile(src, "r"); //DataSource ds = DataSource. //Movie movie = MovieCreator.build("D:\\Mp4\\test.mp4");//randomAccessFile.getChannel() // remove all tracks we will create new tracks from the old List<Track> tracks = movie.getTracks(); movie.setTracks(new LinkedList<Track>()); for (Track track : tracks) { printTime(track); } double startTime = startMs/1000; double endTime = endMs/1000; boolean timeCorrected = false; // Here we try to find a track that has sync samples. Since we can only start decoding // at such a sample we SHOULD make sure that the start of the new fragment is exactly // such a frame for (Track track : tracks) { if (track.getSyncSamples() != null && track.getSyncSamples().length > 0) { if (timeCorrected) { // This exception here could be a false positive in case we have multiple tracks // with sync samples at exactly the same positions. E.g. a single movie containing // multiple qualities of the same video (Microsoft Smooth Streaming file) throw new RuntimeException("The startTime has already been corrected by another track with SyncSample. Not Supported."); } startTime = correctTimeToSyncSample(track, startTime, false);//true endTime = correctTimeToSyncSample(track, endTime, true);//false timeCorrected = true; } } System.out.println("trim startTime-->" startTime); System.out.println("trim endTime-->" endTime); int x = 0; for (Track track : tracks) { long currentSample = 0; double currentTime = 0; long startSample = -1; long endSample = -1; x ; for (int i = 0; i < track.getDecodingTimeEntries().size(); i ) { TimeToSampleBox.Entry entry = track.getDecodingTimeEntries().get(i); for (int j = 0; j < entry.getCount(); j ) { // entry.getDelta() is the amount of time the current sample covers. if (currentTime <= startTime) { // current sample is still before the new starttime startSample = currentSample; } if (currentTime <= endTime) { // current sample is after the new start time and still before the new endtime endSample = currentSample; } else { // current sample is after the end of the cropped video break; } currentTime = (double) entry.getDelta() / (double) track.getTrackMetaData().getTimescale(); currentSample ; } } System.out.println("trim startSample-->" startSample); System.out.println("trim endSample-->" endSample); movie.addTrack(new CroppedTrack(track, startSample, endSample)); break; } //movie.addTrack(new CroppedTrack(track, startSample, endSample)); //IsoFile out = (IsoFile) new DefaultMp4Builder().build(movie); Container container = new DefaultMp4Builder().build(movie); if (!dst.exists()) { dst.createNewFile(); } FileOutputStream fos = new FileOutputStream(dst); FileChannel fc = fos.getChannel(); //out.getBox(fc); // This one build up the memory. container.writeContainer(fc); fc.close(); fos.close(); //randomAccessFile.close(); } public void startAppend(){ } public static void appendVideo(String[] videos) throws IOException{ Movie[] inMovies = new Movie[videos.length]; int index = 0; for(String video:videos) { inMovies[index] = MovieCreator.build(video); index ; } List<Track> videoTracks = new LinkedList<Track>(); List<Track> audioTracks = new LinkedList<Track>(); for (Movie m : inMovies) { for (Track t : m.getTracks()) { if (t.getHandler().equals("soun")) { audioTracks.add(t); } if (t.getHandler().equals("vide")) { videoTracks.add(t); } } } Movie result = new Movie(); if (audioTracks.size() > 0) { result.addTrack(new AppendTrack(audioTracks.toArray(new Track[audioTracks.size()]))); } if (videoTracks.size() > 0) { result.addTrack(new AppendTrack(videoTracks.toArray(new Track[videoTracks.size()]))); } Container out = new DefaultMp4Builder().build(result); FileChannel fc = new RandomAccessFile(String.format("D:\\Mp4\\append2.mp4"), "rw").getChannel(); out.writeContainer(fc); fc.close(); } protected static long getDuration(Track track) { long duration = 0; for (TimeToSampleBox.Entry entry : track.getDecodingTimeEntries()) { duration = entry.getCount() * entry.getDelta(); } return duration; } private static double correctTimeToSyncSample(Track track, double cutHere, boolean next) { double[] timeOfSyncSamples = new double[track.getSyncSamples().length]; long currentSample = 0; double currentTime = 0; for (int i = 0; i < track.getDecodingTimeEntries().size(); i ) { TimeToSampleBox.Entry entry = track.getDecodingTimeEntries().get(i); for (int j = 0; j < entry.getCount(); j ) { if (Arrays.binarySearch(track.getSyncSamples(), currentSample 1) >= 0) { // samples always start with 1 but we start with zero therefore 1 timeOfSyncSamples[Arrays.binarySearch(track.getSyncSamples(), currentSample 1)] = currentTime; } currentTime = (double) entry.getDelta() / (double) track.getTrackMetaData().getTimescale(); currentSample ; } } double previous = 0; for (double timeOfSyncSample : timeOfSyncSamples) { if (timeOfSyncSample > cutHere) { if (next) { return timeOfSyncSample; } else { return previous; } } previous = timeOfSyncSample; } return timeOfSyncSamples[timeOfSyncSamples.length - 1]; } private static void printTime(Track track) { double[] timeOfSyncSamples = new double[track.getSyncSamples().length]; long currentSample = 0; double currentTime = 0; for (int i = 0; i < track.getDecodingTimeEntries().size(); i ) { TimeToSampleBox.Entry entry = track.getDecodingTimeEntries().get(i); for (int j = 0; j < entry.getCount(); j ) { if (Arrays.binarySearch(track.getSyncSamples(), currentSample 1) >= 0) { // samples always start with 1 but we start with zero therefore 1 timeOfSyncSamples[Arrays.binarySearch(track.getSyncSamples(), currentSample 1)] = currentTime; System.out.println("currentTime-->" currentTime); } currentTime = (double) entry.getDelta() / (double) track.getTrackMetaData().getTimescale(); currentSample ; } } //System.out.println("size-->" currentSample); /*for(int i=0;i<timeOfSyncSamples.length;i ){ System.out.println("data-->" timeOfSyncSamples[i]); }*/ /*double previous = 0; for (double timeOfSyncSample : timeOfSyncSamples) { if (timeOfSyncSample > cutHere) { if (next) { return timeOfSyncSample; } else { return previous; } } previous = timeOfSyncSample; } return timeOfSyncSamples[timeOfSyncSamples.length - 1];*/ } }
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