本篇文章已授權(quán)微信公眾號(hào) guolin_blog （郭霖）獨(dú)家發(fā)布
PhotoMovie（https://github.com/yellowcath/PhotoMovie）可輕松實(shí)現(xiàn)類似抖音女蜈、微視喘蟆、美拍的照片電影功能。效果如下
濾鏡效果
轉(zhuǎn)場(chǎng)效果
基本用法
//添加圖片
List<PhotoData> photoDataList = new LinkedList<PhotoData>();
photoDataList.add(new SimplePhotoData(context,photoPath1,PhotoData.STATE_LOCAL));
...
photoDataList.add(new SimplePhotoData(context,photoPathN,PhotoData.STATE_LOCAL));
//生成圖片源
PhotoSource photoSource = new PhotoSource(photoDataList);
//生成照片電影(使用預(yù)定義的水平轉(zhuǎn)場(chǎng)動(dòng)畫)
PhotoMovie photoMovie = PhotoMovieFactory.generatePhotoMovie(photoSource, PhotoMovieFactory.PhotoMovieType.HORIZONTAL_TRANS);
//生成負(fù)責(zé)繪制電影內(nèi)容的MovieRenderer
MovieRenderer movieRenderer = new GLTextureMovieRender(glTextureView);
/**
* OR MovieRenderer movieRenderer = new GLSurfaceMovieRenderer(glSurfaceView);
*/
//照片電影播放器
PhotoMoviePlayer photoMoviePlayer = new PhotoMoviePlayer(context);
photoMoviePlayer.setMovieRenderer(mMovieRenderer);
photoMoviePlayer.setMovieListener(...);
photoMoviePlayer.setLoop(true);
photoMoviePlayer.setOnPreparedListener(new PhotoMoviePlayer.OnPreparedListener() {
@Override
public void onPreparing(PhotoMoviePlayer moviePlayer, float progress) {
}
@Override
public void onPrepared(PhotoMoviePlayer moviePlayer, int prepared, int total) {
mPhotoMoviePlayer.start();
}
@Override
public void onError(PhotoMoviePlayer moviePlayer) {
}
});
photoMoviePlayer.prepare();
輕松擴(kuò)展
PhotoMovie使用模塊化的設(shè)計(jì)唯笙，每個(gè)部分都可以自定義然后替換私痹，主要類圖如下
鱼填，在這段時(shí)間之內(nèi)以特定的方式播放圖片，例如ScaleSegment會(huì)對(duì)圖片做縮放動(dòng)畫喉祭、EndGaussianBlurSegment會(huì)對(duì)圖片做從清晰到模糊的高斯模糊動(dòng)畫
PhotoMovie:核心類盖喷，代表照片電影本身爆办，由圖片源（PhotoSource）和若干電影片段(MovieSegment)組成一個(gè)完整的照片電影，圖片通過PhotoAllocator分配給MovieSegment
MovieLayer:為MovieSegment擴(kuò)展繪制多層特效的功能课梳，例如SubtitleLayer提供字幕展示
IMovieFilter:為整個(gè)照片電影提供濾鏡
MovieRenderer:負(fù)責(zé)把照片電影渲染到指定的輸出界面距辆，例如TextureView（GLTextureMovieRender）余佃、GLSurfaceView(GLSurfaceMovieRenderer)
PhotoMoviePlayer:提供類似MediaPlayer的接口，負(fù)責(zé)播放照片電影,播放進(jìn)度由IMovieTimer控制
擴(kuò)展電影類型
目前內(nèi)置了6種類型,后兩種即是抖音的左右切換和上下切換跨算，Thaw和WINDOW仿自美拍
public enum PhotoMovieType {
THAW, //融雪
SCALE, //縮放
SCALE_TRANS, //縮放 & 平移
WINDOW, //窗扉
HORIZONTAL_TRANS,//橫向平移
VERTICAL_TRANS//縱向平移
}
這里以微視的漸變特效為例展示如何擴(kuò)展
分析得出咙冗，漸變特效首先圖片居中放置，然后全程做一個(gè)微弱的放大動(dòng)畫漂彤，后半部分同時(shí)透明度變化消失
，更直觀的流程如下圖
可見需要兩個(gè)不同的片段類型
首先創(chuàng)建FitCenterScaleSegment,繼承FitCenterSegment灾搏，實(shí)現(xiàn)單張圖片的放大動(dòng)畫
public class FitCenterScaleSegment extends FitCenterSegment {
/**
* 縮放動(dòng)畫范圍
*/
private float mScaleFrom;
private float mScaleTo;
private float mProgress;
/**
* @param duration 片段時(shí)長(zhǎng)
* @param scaleFrom 縮放范圍
* @param scaleTo 縮放范圍
*/
public FitCenterScaleSegment(int duration, float scaleFrom, float scaleTo) {
super(duration);
mScaleFrom = scaleFrom;
mScaleTo = scaleTo;
}
@Override
protected void onDataPrepared() {
super.onDataPrepared();
}
@Override
public void drawFrame(GLESCanvas canvas, float segmentProgress) {
mProgress = segmentProgress;
if (!mDataPrepared) {
return;
}
drawBackground(canvas);
float scale = mScaleFrom + (mScaleTo - mScaleFrom) * mProgress;
//FitCenterSegment已經(jīng)具有縮放能力挫望，這里傳縮放值即可
drawContent(canvas, scale);
}
//提升這兩個(gè)函數(shù)的訪問權(quán)限，供轉(zhuǎn)場(chǎng)時(shí)使用
@Override
public void drawContent(GLESCanvas canvas, float scale) {
super.drawContent(canvas, scale);
}
@Override
public void drawBackground(GLESCanvas canvas) {
super.drawBackground(canvas);
}
}
然后創(chuàng)建轉(zhuǎn)場(chǎng)片段GradientTransferSegment,其父類TransitionSegment同時(shí)持有上一個(gè)與下一個(gè)片段狂窑，
可以在其基礎(chǔ)上實(shí)現(xiàn)任意轉(zhuǎn)場(chǎng)功能
public class GradientTransferSegment extends TransitionSegment<FitCenterScaleSegment, FitCenterScaleSegment> {
/**
* 縮放動(dòng)畫范圍
*/
private float mPreScaleFrom;
private float mPreScaleTo;
private float mNextScaleFrom;
private float mNextScaleTo;
public GradientTransferSegment(int duration,
float preScaleFrom, float preScaleTo,
float nextScaleFrom, float nextScaleTo) {
mPreScaleFrom = preScaleFrom;
mPreScaleTo = preScaleTo;
mNextScaleFrom = nextScaleFrom;
mNextScaleTo = nextScaleTo;
setDuration(duration);
}
@Override
protected void onDataPrepared() {
}
@Override
public void drawFrame(GLESCanvas canvas, float segmentProgress) {
//下一個(gè)片段開始放大
float nextScale = mNextScaleFrom + (mNextScaleTo - mNextScaleFrom) * segmentProgress;
mNextSegment.drawContent(canvas, nextScale);
//上一個(gè)片段繼續(xù)放大同時(shí)變透明
float preScale = mPreScaleFrom + (mPreScaleTo - mPreScaleFrom) * segmentProgress;
float alpha = 1 - segmentProgress;
mPreSegment.drawBackground(canvas);
canvas.save();
canvas.setAlpha(alpha);
mPreSegment.drawContent(canvas, preScale);
canvas.restore();
}
創(chuàng)建照片電影
private static PhotoMovie initGradientPhotoMovie(PhotoSource photoSource) {
List<MovieSegment> segmentList = new ArrayList<>(photoSource.size());
for (int i = 0; i < photoSource.size(); i++) {
if (i == 0) {
segmentList.add(new FitCenterScaleSegment(1600, 1f, 1.1f));
} else {
segmentList.add(new FitCenterScaleSegment(1600, 1.05f, 1.1f));
}
if (i < photoSource.size() - 1) {
segmentList.add(new GradientTransferSegment(800, 1.1f, 1.15f, 1.0f, 1.05f));
}
}
return new PhotoMovie(photoSource, segmentList);
}
然后將這個(gè)PhotoMovie正常播放即可媳板，效果如下
擴(kuò)展濾鏡
目前內(nèi)置了9個(gè)濾鏡
public enum FilterType {
NONE,
CAMEO,//浮雕
GRAY,//黑白
KUWAHARA,//水彩
SNOW,//飄雪（動(dòng)態(tài)）
LUT1,
LUT2,
LUT3,
LUT4,
LUT5,
}
先看IMovieFilter
public interface IMovieFilter {
void doFilter(PhotoMovie photoMovie,int elapsedTime, FboTexture inputTexture, FboTexture outputTexture);
void release();
}
外部會(huì)提供一個(gè)輸入紋理，然后由IMovieFilter處理之后繪制到輸出紋理上泉哈，即實(shí)現(xiàn)了濾鏡效果
BaseMovieFilter已經(jīng)實(shí)現(xiàn)了基本的輸入輸出流程蛉幸，例如要做最基本的黑白濾鏡，只需更換FRAGMENT_SHADER即可
public class GrayMovieFilter extends BaseMovieFilter {
protected static final String FRAGMENT_SHADER = "" +
"varying highp vec2 textureCoordinate;\n" +
" \n" +
"uniform sampler2D inputImageTexture;\n" +
" \n" +
"void main()\n" +
"{\n" +
" mediump vec4 color = texture2D(inputImageTexture, textureCoordinate);\n" +
" mediump float gray = color.r*0.3+color.g*0.59+color.b*0.11;\n"+
" gl_FragColor = vec4(gray,gray,gray,1.0);\n"+
"}";
public GrayMovieFilter(){
super(VERTEX_SHADER,FRAGMENT_SHADER);
}
}
同時(shí)PhotoMovie提供了對(duì)Lut濾鏡的支持
Lut其實(shí)就是Lookup Table（顏色查找表）丛晦，根據(jù)原圖的RGB值去相應(yīng)的lut圖里面查找對(duì)應(yīng)轉(zhuǎn)換后的RGB值奕纫，從而實(shí)現(xiàn)各種濾鏡效果
| lut | 效果 |
|---|---|
 lut(原圖)
|
 原圖
|
 lut_2.jpg
|
 濾鏡效果圖
|
public class LutMovieFilter extends TwoTextureMovieFilter {
public LutMovieFilter(Bitmap lutBitmap){
super(loadShaderFromAssets("shader/two_vertex.glsl"),loadShaderFromAssets("shader/lut.glsl"));
setBitmap(lutBitmap);
}
}
在LutMovieFilter的構(gòu)造函數(shù)傳入上面表格里的lut圖，即可實(shí)現(xiàn)相應(yīng)的濾鏡效果,前面提到的黑白濾鏡也可用這個(gè)方式實(shí)現(xiàn)
錄制功能
GLMovieRecorder提供了將照片電影錄制為mp4的功能
可參照DemoPresenter的saveVideo()函數(shù)
GLMovieRecorder recorder = new GLMovieRecorder();
recorder.configOutput(width, height(), bitrate,frameRate,iFrameInterval, outputPath);
recorder.setDataSource(movieRenderer);
recorder.startRecord(new GLMovieRecorder.OnRecordListener() {
@Override
public void onRecordFinish(boolean success) {
......
}
@Override
public void onRecordProgress(int recordedDuration, int totalDuration) {
......
}
});
背景音樂
mPhotoMoviePlayer.setMusic(context, mMusicUri);
PhotoMovie只提供了播放背景音樂的功能烫沙，錄制完成之后需自行合成匹层，Demo里使用了
VideoProcessor進(jìn)行合成
VideoProcessor.mixAudioTrack(context, videPath, audioPath,outputPath, null, null, 0,100, 1f, 1f);
