Android MP4Coder H264和AAC合成MP4视频库

转载自：http://blog.csdn.net/jay100500/article/details/52957837

遵循：BY-NC-SA

署名-非商业性使用-相同方式共享 4.0协议

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

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];
}

}

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.writeC
af93
ontainer(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