Android MP4Coder H264和AAC合成MP4视频库

r囧r小猫 2022-07-15 01:49 317阅读 0赞

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作者：谭东

时间：2016年10月28日

环境：Windows 7

Mp4Coder，H264和AAC合成MP4视频库

Github地址：[https://github.com/zuichu/Mp4Coder][https_github.com_zuichu_Mp4Coder]

主要支持功能：

*  H264和AAC合成MP4视频文件  
    
 *  MP4文件拼接成MP4视频文件  
    
 *  AAC文件拼接成AAC音频文件  
    
 *  MP4文件裁剪、剪切  
    
 *  AAC文件裁剪、剪切  
    
 *  MP4文件提取分离AAC音频文件
 *  MP4文件提取分离H264 文件  
    
 *  H264和网络流AAC文件合成MP4视频文件
 *  其他更多功能和用法参考examples里的例子用法...

用法：

try {
           H264TrackImpl h264Track = new H264TrackImpl(new FileDataSourceImpl(Environment.getExternalStorageDirectory() + "/imgBufFrame.h264"));
           AACTrackImpl aacTrack = new AACTrackImpl(new FileDataSourceImpl(Environment.getExternalStorageDirectory() + "/test.aac"));
           Movie movie = new Movie();
           movie.addTrack(h264Track);
           movie.addTrack(aacTrack);
           Container mp4file = new DefaultMp4Builder().build(movie);
           FileChannel fc = new FileOutputStream(new File(Environment.getExternalStorageDirectory() + "/encode.mp4")).getChannel();
           mp4file.writeContainer(fc);
           fc.close();
        } catch (IOException e) {
          e.printStackTrace();
       }

也可以根据实际情况自定义帧率：

H264TrackImpl h264Track1 = new H264TrackImpl(new FileDataSourceImpl(Environment.getExternalStorageDirectory() + "/video.h264"), "eng", 15000, 1001);
    
    //给出源码解释：
    
     /**
         * Creates a new <code>Track</code> object from a raw H264 source (<code>DataSource dataSource1</code>).
         * Whenever the timescale and frametick are set to negative value (e.g. -1) the H264TrackImpl
         * tries to detect the frame rate.
         * Typically values for <code>timescale</code> and <code>frametick</code> are:
         * <ul>
         * <li>23.976 FPS: timescale = 24000; frametick = 1001</li>
         * <li>25 FPS: timescale = 25; frametick = 1</li>
         * <li>29.97 FPS: timescale = 30000; frametick = 1001</li>
         * <li>30 FPS: timescale = 30; frametick = 1</li>
         * </ul>
         *
         * @param dataSource the source file of the H264 samples
         * @param lang       language of the movie (in doubt: use "eng")
         * @param timescale  number of time units (ticks) in one second
         * @param frametick  number of time units (ticks) that pass while showing exactly one frame
         * @throws IOException in case of problems whiel reading from the <code>DataSource</code>
         */
        public H264TrackImpl(DataSource dataSource, String lang, long timescale, int frametick) throws IOException {
            super(dataSource);
            this.lang = lang;
            this.timescale = timescale; //e.g. 23976
            this.frametick = frametick;
            if ((timescale > 0) && (frametick > 0)) {
                this.determineFrameRate = false;
            }
    
            parse(new LookAhead(dataSource));
        }

可以实现H264编码视频文件和AAC音频文件合成为MP4视频文件，也可以实现多个mp4文件拼接。

//拼接示例  
    
     List<String> fileList = new ArrayList<String>();
            List<Movie> moviesList = new LinkedList<Movie>();
            fileList.add(Environment.getExternalStorageDirectory() + "/1.mp4");
            fileList.add(Environment.getExternalStorageDirectory() + "/2.mp4");
            try {
                for (String file : fileList) {
                    moviesList.add(MovieCreator.build(file));
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
    
            List<Track> videoTracks = new LinkedList<Track>();
            List<Track> audioTracks = new LinkedList<Track>();
            for (Movie m : moviesList) {
                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();
    
            try {
                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()])));
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
    
            Container out = new DefaultMp4Builder().build(result);
    
            try {
                FileChannel fc = new FileOutputStream(new File(Environment.getExternalStorageDirectory() + "/encode.mp4")).getChannel();
                out.writeContainer(fc);
                fc.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
    
            moviesList.clear();
            fileList.clear();

MP4文件的信息解析

String localFilePath = Environment.getExternalStorageDirectory() + "/test.mp4";
            IsoFile isoFile = null;
            try {
                isoFile = new IsoFile(new RandomAccessFile(localFilePath, "r").getChannel());
            } catch (Exception e) {
                e.printStackTrace();
            }
    
            if (isoFile == null) {
                Log.i("info", "isoFile == null");
                return;
            }
    
            List<Box> boxes = isoFile.getBoxes();
            Log.i("info", "box size:" + boxes.size());
            MovieBox moov = isoFile.getBoxes(MovieBox.class).get(0);
            if (moov != null) {
                int nLen = moov.getBoxes().size();
                Log.i("info", "movie box:" + nLen);
                MovieHeaderBox hb = moov.getMovieHeaderBox();
                Log.i("info", "MovieHeaderBox:" + hb);
                Log.d("info", "duration:" + hb.getDuration());
            }
        }

MP4文件的剪切

public class ClipUtils {
    
        private static final String TAG = "info";
    
        /**
         * 截取指定时间段的视频
         *
         * @param inPath 视频的路径
         * @param begin  需要截取的开始时间
         * @param end    截取的结束时间
         * @throws IOException
         */
        public static void clipVideo(String inPath, String outPath, double begin, double end)
                throws IOException {
            Movie movie = MovieCreator.build(inPath);
    
            List<Track> tracks = movie.getTracks();
            movie.setTracks(new LinkedList<Track>());
            // remove all tracks we will create new tracks from the old
    
            double startTime1 = begin;
            double endTime1 = end;
            // double startTime2 = 30;
            // double endTime2 = 40;
    
            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)
                        Log.e(TAG,
                                "The startTime has already been corrected by another track with SyncSample. Not Supported.");
                        throw new RuntimeException(
                                "The startTime has already been corrected by another track with SyncSample. Not Supported.");
                    }
                    startTime1 = correctTimeToSyncSample(track, startTime1, false);
                    endTime1 = correctTimeToSyncSample(track, endTime1, true);
                    // startTime2 = correctTimeToSyncSample(track, startTime2,
                    // false);
                    // endTime2 = correctTimeToSyncSample(track, endTime2, true);
                    timeCorrected = true;
                }
            }
    
            for (Track track : tracks) {
                long currentSample = 0;
                double currentTime = 0;
                double lastTime = 0;
                long startSample1 = -1;
                long endSample1 = -1;
                // long startSample2 = -1;
                // long endSample2 = -1;
    
                for (int i = 0; i < track.getSampleDurations().length; i++) {
                    long delta = track.getSampleDurations()[i];
    
                    if (currentTime > lastTime && currentTime <= startTime1) {
                        // current sample is still before the new starttime
                        startSample1 = currentSample;
                    }
                    if (currentTime > lastTime && currentTime <= endTime1) {
                        // current sample is after the new start time and still
                        // before the new endtime
                        endSample1 = currentSample;
                    }
                    // if (currentTime > lastTime && currentTime <= startTime2) {
                    // // current sample is still before the new starttime
                    // startSample2 = currentSample;
                    // }
                    // if (currentTime > lastTime && currentTime <= endTime2) {
                    // // current sample is after the new start time and still
                    // before the new endtime
                    // endSample2 = currentSample;
                    // }
                    lastTime = currentTime;
                    currentTime += (double) delta
                            / (double) track.getTrackMetaData().getTimescale();
                    currentSample++;
                }
                movie.addTrack(new CroppedTrack(track, startSample1, endSample1));// new
                // AppendTrack(new
                // CroppedTrack(track,
                // startSample1,
                // endSample1),
                // new
                // CroppedTrack(track,
                // startSample2,
                // endSample2)));
            }
            long start1 = System.currentTimeMillis();
            Container out = new DefaultMp4Builder().build(movie);
            long start2 = System.currentTimeMillis();
            FileOutputStream fos = new FileOutputStream(outPath);
            FileChannel fc = fos.getChannel();
            out.writeContainer(fc);
    
            fc.close();
            fos.close();
            long start3 = System.currentTimeMillis();
            Log.e(TAG, "Building IsoFile took : " + (start2 - start1) + "ms");
            Log.e(TAG, "Writing IsoFile took : " + (start3 - start2) + "ms");
            Log.e(TAG,
                    "Writing IsoFile speed : "
                            + (new File(String.format("output-%f-%f.mp4",
                            startTime1, endTime1)).length()
                            / (start3 - start2) / 1000) + "MB/s");
        }
    
        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.getSampleDurations().length; i++) {
                long delta = track.getSampleDurations()[i];
    
                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) delta
                        / (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];
        }
    
    }  </span></span>

MP4文件提取AAC音频文件

List<Track> audioTracks = new LinkedList<Track>();
            try {
                Movie movie = MovieCreator.build(Environment.getExternalStorageDirectory() + "/input.mp4");
                for (Track t : movie.getTracks()) {
                    if (t.getHandler().equals("soun")) {
                        audioTracks.add(t);
                    }
                }
                Movie result = new Movie();
                if (audioTracks.size() > 0) {
                    result.addTrack(new AppendTrack(audioTracks.toArray(new Track[audioTracks.size()])));
                }
                Container out = new DefaultMp4Builder().build(result);
                FileChannel fc = new FileOutputStream(new File(Environment.getExternalStorageDirectory() + "/output.aac")).getChannel();
                out.writeContainer(fc);
                fc.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

当然也可以实现MP4提取视频文件，H264和网络AAC文件合并MP4操作等其他操作...

其他用法和功能请看examples里的文件用法实例

可使用aar库，方便些。

Github地址：[https://github.com/zuichu/Mp4Coder][https_github.com_zuichu_Mp4Coder]

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[BY-NC-SA]: https://creativecommons.org/licenses/by-nc-sa/4.0/
[https_github.com_zuichu_Mp4Coder]: https://github.com/zuichu/Mp4Coder