关于android中mp4转gif的那些事

  最近有个朋友问我，如何把mp4转成gif，我首先想到的是利用glide抽出几帧然后合并，然后就和朋友说了。结果过了几天朋友说不行效果不好，glide抽出来的好像是关键帧，效果比较差。那时候我比较忙，有点敷衍的和他说让他在看看。直到前几天在群里看到也有好几个人问然后我在网上搜搜，发现还相关这个的文章还真不多。于是抽空写了一个转换方式给大家用用。详细的内容和原理就不讲了。估计大家也不爱听。总之拿来就用干就完了

package com.yxt.videoplay;import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.ImageFormat;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.graphics.YuvImage;
import android.media.Image;
import android.media.MediaCodec;
import android.media.MediaCodecInfo;
import android.media.MediaExtractor;
import android.media.MediaFormat;
import android.os.Environment;
import android.util.Log;import com.bumptech.glide.gifencoder.AnimatedGifEncoder;import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;/*** 作者太懒了 是在没时间手写gif 所以借用了glide合成gif* 使用这个时请依赖  implementation 'com.github.bumptech.glide:glide:3.7.0'* 另外为什么mp4 转gif 会这么大*      比如25fps关键帧为3秒一帧的mp4来说*      实际上 3秒内一共有 25*3帧 而只有一张图片 其他全是计算出来的像素块*      而gif是 25*3张图片 所以 gif要远远大于mp4   毕竟mp4是h254压缩编码*      如果嫌弃转换后的gif过大*      compressToJpeg方法里的 yuvImage.compressToJpeg(rect, 100, outStream);*      这个100 可以往下改  比如设置30***  另外  还是因为作者太懒了  没有写缓存删除 和gif位置存放 请各位自己写把*/
public class Mp4ToGif {private static final String TAG = "Mp4ToGif";private static final boolean VERBOSE = true;private static final long DEFAULT_TIMEOUT_US = 10000;private static final int COLOR_FormatI420 = 1;private static final int COLOR_FormatNV21 = 2;public static final int FILE_TypeI420 = 1;public static final int FILE_TypeNV21 = 2;public static final int FILE_TypeJPEG = 3;private final int decodeColorFormat = MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Flexible;private String OUTPUT_DIR;private List list = new ArrayList<>();private CallBack callBack;public void setSaveFrames(String dir, int fileType) throws IOException {if (fileType != FILE_TypeI420 && fileType != FILE_TypeNV21 && fileType != FILE_TypeJPEG) {throw new IllegalArgumentException("only support FILE_TypeI420 " + "and FILE_TypeNV21 " + "and FILE_TypeJPEG");}File theDir = new File(dir);if (!theDir.exists()) {theDir.mkdirs();} else if (!theDir.isDirectory()) {throw new IOException("Not a directory");}OUTPUT_DIR = theDir.getAbsolutePath() + "/";}public void videoDecode(String videoFilePath,int startTime,int endTime) throws IOException {MediaExtractor extractor = null;MediaCodec decoder = null;try {File videoFile = new File(videoFilePath);extractor = new MediaExtractor();extractor.setDataSource(videoFile.toString());int trackIndex = selectTrack(extractor);if (trackIndex < 0) {throw new RuntimeException("No video track found in " + videoFilePath);}extractor.selectTrack(trackIndex);MediaFormat mediaFormat = extractor.getTrackFormat(trackIndex);String mime = mediaFormat.getString(MediaFormat.KEY_MIME);decoder = MediaCodec.createDecoderByType(mime);if (isColorFormatSupported(decodeColorFormat, decoder.getCodecInfo().getCapabilitiesForType(mime))) {mediaFormat.setInteger(MediaFormat.KEY_COLOR_FORMAT, decodeColorFormat);}decodeFramesToImage(decoder, extractor, mediaFormat,startTime,endTime);decoder.stop();} finally {if (decoder != null) {decoder.stop();decoder.release();decoder = null;}if (extractor != null) {extractor.release();extractor = null;}}}private boolean isColorFormatSupported(int colorFormat, MediaCodecInfo.CodecCapabilities caps) {for (int c : caps.colorFormats) {if (c == colorFormat) {return true;}}return false;}private void decodeFramesToImage(MediaCodec decoder, MediaExtractor extractor, MediaFormat mediaFormat,int startTime,int endTime) {MediaCodec.BufferInfo info = new MediaCodec.BufferInfo();boolean sawInputEOS = false;boolean sawOutputEOS = false;decoder.configure(mediaFormat, null, null, 0);decoder.start();final int width = mediaFormat.getInteger(MediaFormat.KEY_WIDTH);final int height = mediaFormat.getInteger(MediaFormat.KEY_HEIGHT);int outputFrameCount = 0;long dts = 0;while (!sawOutputEOS) {if (!sawInputEOS) {int inputBufferId = decoder.dequeueInputBuffer(DEFAULT_TIMEOUT_US);if (inputBufferId >= 0) {ByteBuffer inputBuffer = decoder.getInputBuffer(inputBufferId);int sampleSize = extractor.readSampleData(inputBuffer, 0);if (sampleSize < 0) {decoder.queueInputBuffer(inputBufferId, 0, 0, 0L, MediaCodec.BUFFER_FLAG_END_OF_STREAM);sawInputEOS = true;} else {dts = extractor.getSampleTime();decoder.queueInputBuffer(inputBufferId, 0, sampleSize, dts, 0);extractor.advance();}}}int outputBufferId = decoder.dequeueOutputBuffer(info, DEFAULT_TIMEOUT_US);if (outputBufferId >= 0) {if ((info.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0) {sawOutputEOS = true;}boolean doRender = (info.size != 0);if (doRender) {outputFrameCount++;Log.e("timetime",dts+"   "+outputFrameCount);if(dts>=((long) startTime *1000000)&&dts<= ((long) endTime *1000000)) {Image image = decoder.getOutputImage(outputBufferId);String fileName = OUTPUT_DIR + String.format("frame_%05d.jpg", outputFrameCount);list.add(fileName);compressToJpeg(fileName, image);image.close();}else if(dts<= ((long) endTime *1000)){sawOutputEOS = true;}decoder.releaseOutputBuffer(outputBufferId, true);}}}Log.e("fpsfps",outputFrameCount/(dts/1000000)+"  ");int fps = (int) (outputFrameCount/(dts/1000000));try {createGif("1",list,fps,width,height);} catch (IOException e) {e.printStackTrace();}}private static int selectTrack(MediaExtractor extractor) {int numTracks = extractor.getTrackCount();for (int i = 0; i < numTracks; i++) {MediaFormat format = extractor.getTrackFormat(i);String mime = format.getString(MediaFormat.KEY_MIME);if (mime.startsWith("video/")) {return i;}}return -1;}private static boolean isImageFormatSupported(Image image) {int format = image.getFormat();switch (format) {case ImageFormat.YUV_420_888:case ImageFormat.NV21:case ImageFormat.YV12:return true;}return false;}private static byte[] getDataFromImage(Image image, int colorFormat) {if (colorFormat != COLOR_FormatI420 && colorFormat != COLOR_FormatNV21) {throw new IllegalArgumentException("only support COLOR_FormatI420 " + "and COLOR_FormatNV21");}if (!isImageFormatSupported(image)) {throw new RuntimeException("can't convert Image to byte array, format " + image.getFormat());}Rect crop = image.getCropRect();int format = image.getFormat();int width = crop.width();int height = crop.height();Image.Plane[] planes = image.getPlanes();byte[] data = new byte[width * height * ImageFormat.getBitsPerPixel(format) / 8];byte[] rowData = new byte[planes[0].getRowStride()];if (VERBOSE) Log.v(TAG, "get data from " + planes.length + " planes");int channelOffset = 0;int outputStride = 1;for (int i = 0; i < planes.length; i++) {switch (i) {case 0:channelOffset = 0;outputStride = 1;break;case 1:if (colorFormat == COLOR_FormatI420) {channelOffset = width * height;outputStride = 1;} else if (colorFormat == COLOR_FormatNV21) {channelOffset = width * height + 1;outputStride = 2;}break;case 2:if (colorFormat == COLOR_FormatI420) {channelOffset = (int) (width * height * 1.25);outputStride = 1;} else if (colorFormat == COLOR_FormatNV21) {channelOffset = width * height;outputStride = 2;}break;}ByteBuffer buffer = planes[i].getBuffer();int rowStride = planes[i].getRowStride();int pixelStride = planes[i].getPixelStride();int shift = (i == 0) ? 0 : 1;int w = width >> shift;int h = height >> shift;buffer.position(rowStride * (crop.top >> shift) + pixelStride * (crop.left >> shift));for (int row = 0; row < h; row++) {int length;if (pixelStride == 1 && outputStride == 1) {length = w;buffer.get(data, channelOffset, length);channelOffset += length;} else {length = (w - 1) * pixelStride + 1;buffer.get(rowData, 0, length);for (int col = 0; col < w; col++) {data[channelOffset] = rowData[col * pixelStride];channelOffset += outputStride;}}if (row < h - 1) {buffer.position(buffer.position() + rowStride - length);}}if (VERBOSE) Log.v(TAG, "Finished reading data from plane " + i);}return data;}private static void dumpFile(String fileName, byte[] data) {FileOutputStream outStream;try {outStream = new FileOutputStream(fileName);} catch (IOException ioe) {throw new RuntimeException("Unable to create output file " + fileName, ioe);}try {outStream.write(data);outStream.close();} catch (IOException ioe) {throw new RuntimeException("failed writing data to file " + fileName, ioe);}}private void compressToJpeg(String fileName, Image image) {FileOutputStream outStream;try {outStream = new FileOutputStream(fileName);} catch (IOException ioe) {throw new RuntimeException("Unable to create output file " + fileName, ioe);}Rect rect = image.getCropRect();YuvImage yuvImage = new YuvImage(getDataFromImage(image, COLOR_FormatNV21), ImageFormat.NV21, rect.width(), rect.height(), null);yuvImage.compressToJpeg(rect, 100, outStream);}public String createGif(String filename, List paths, int fps, int width, int height) throws IOException {ByteArrayOutputStream baos = new ByteArrayOutputStream();AnimatedGifEncoder localAnimatedGifEncoder = new AnimatedGifEncoder();localAnimatedGifEncoder.start(baos);//startlocalAnimatedGifEncoder.setRepeat(0);//设置生成gif的开始播放时间。0为立即开始播放localAnimatedGifEncoder.setDelay(fps);if (paths.size() > 0) {for (int i = 0; i < paths.size(); i++) {Bitmap bitmap = BitmapFactory.decodeFile(paths.get(i));Bitmap resizeBm = resizeImage(bitmap, width, height);localAnimatedGifEncoder.addFrame(resizeBm);}}localAnimatedGifEncoder.finish();//finishFile file = new File(Environment.getExternalStorageDirectory().getPath() + "/yxt");if (!file.exists()) file.mkdir();String path = Environment.getExternalStorageDirectory().getPath() + "/yxt/" + filename + ".gif";FileOutputStream fos = new FileOutputStream(path);baos.writeTo(fos);baos.flush();fos.flush();baos.close();fos.close();if(callBack!=null){callBack.finish();}return path;}//使用Bitmap加Matrix来缩放public static Bitmap resizeImage(Bitmap bitmap, int w, int h){Bitmap BitmapOrg = bitmap;int width = BitmapOrg.getWidth();int height = BitmapOrg.getHeight();int newWidth = w;int newHeight = h;float scaleWidth = ((float) newWidth) / width;float scaleHeight = ((float) newHeight) / height;Matrix matrix = new Matrix();matrix.postScale(scaleWidth, scaleHeight);// if you want to rotate the Bitmap// matrix.postRotate(45);Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width,height, matrix, true);return resizedBitmap;}public void setCallBack(CallBack callBack) {this.callBack = callBack;}interface CallBack{void finish();}
}

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