让IjkPlayer支持插入自定义的GPU滤镜

Posted 湖广午王

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篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了让IjkPlayer支持插入自定义的GPU滤镜相关的知识,希望对你有一定的参考价值。

最近因为工作的原因,需要提供一个将我们的AiyaEffectsSDK插入到IjkPlayer中的示例,就不得不好好看了下IjkPlayer的代码。在IjkPlayer中并没有提供设置自定义GPU滤镜的接口,所以最后只能自己动手,以求丰衣足食了。不得不说,Bilibili开源的这个IjkPlayer播放器的确非常强大,代码设计的非常清晰,仔细看看,能学到不少东西。

IjkPlayer源码获取及编译方法

源码地址,编译参考readme即可:

# 获取ijk源码
git clone https://github.com/Bilibili/ijkplayer.git ijkplayer-android
# 进入源码目录
cd ijkplayer-android
# checkout 最新版本
git checkout -B latest k0.8.0
# 执行脚本,此脚本会下载ijk依赖的源码,比如ffmpeg
./init-android.sh
# 编译ffmpeg, all可以换成指定版本,如armv7a
cd android/contrib
./compile-ffmpeg.sh clean
./compile-ffmpeg.sh all
# 编译ijkplayer,all可以换成指定版本,如armv7a
cd ..
./compile-ijk.sh all

IjkPlayer分析及修改

Android 版的IjkPlayer示例工程中,播放视频界面为tv.danmaku.ijk.media.example.activities.VideoActivity,在VideoActivity中使用的是IjkVideoView来播放视频的,位于tv.danmaku.ijk.media.example.widget.media包下。
IjkVideoView使用与Android的VideoView基本一致,在IjkVideoView中,设置视频源调用setVideoURI方法,而此方法又会调用private属性的openVideo方法。在openVideo方法中,会根据mSettings.getPlayer()的值创建一个IMediaPlayer

public IMediaPlayer createPlayer(int playerType) 
        IMediaPlayer mediaPlayer = null;

        switch (playerType) 
            case Settings.PV_PLAYER__IjkExoMediaPlayer: 
                IjkExoMediaPlayer IjkExoMediaPlayer = new IjkExoMediaPlayer(mAppContext);
                mediaPlayer = IjkExoMediaPlayer;
            
            break;
            case Settings.PV_PLAYER__AndroidMediaPlayer: 
                AndroidMediaPlayer androidMediaPlayer = new AndroidMediaPlayer();
                mediaPlayer = androidMediaPlayer;
            
            break;
            case Settings.PV_PLAYER__IjkMediaPlayer:
            default: 
                IjkMediaPlayer ijkMediaPlayer = null;
                if (mUri != null) 
                    ijkMediaPlayer = new IjkMediaPlayer();
                    ijkMediaPlayer.native_setLogLevel(IjkMediaPlayer.IJK_LOG_DEBUG);

                    if (mSettings.getUsingMediaCodec()) 
                        ijkMediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "mediacodec", 1);
                        if (mSettings.getUsingMediaCodecAutoRotate()) 
                            ijkMediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "mediacodec-auto-rotate", 1);
                         else 
                            ijkMediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "mediacodec-auto-rotate", 0);
                        
                        if (mSettings.getMediaCodecHandleResolutionChange()) 
                            ijkMediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "mediacodec-handle-resolution-change", 1);
                         else 
                            ijkMediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "mediacodec-handle-resolution-change", 0);
                        
                     else 
                        ijkMediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "mediacodec", 0);
                    
                    //省略其他参数设置的的代码
                
                mediaPlayer = ijkMediaPlayer;
            
            break;
        

        if (mSettings.getEnableDetachedSurfaceTextureView()) 
            mediaPlayer = new TextureMediaPlayer(mediaPlayer);
        

        return mediaPlayer;
    

从上面代码中可以看到,在IjkVideoView中多处用到了mSettings,mSettings的值主要是用户设置的,通过SharedPreferences保存的,包括音视频解码设置、是否使用OpenSLES、渲染View等等。可以参看SettingsActivity界面。
根据playerType创建IjkMediaPlayer,前两类分别为google的ExoPlayer和Android的MediaPlayer。除此之外才是真正的创建的IjkPlayer。
mSettings中的其他参数最终会转换后通过IjkMediaPlayer的setOption方法进行设置,而IjkMediaPlayer.setOption又是直接调用native方法。进入IjkMediaPlayer可以发现,IjkMediaPlayer中的许多方法都是native方法,或者调用了native方法。

增加setGLFilter接口

在ijkmedia文件夹下全局搜索其中一个方法_setDataSource,得到内容大致如下:

F:\\cres\\C\\ijkplayer-android\\ijkmedia\\ijkplayer\\android\\ijkplayer_jni.c:
  151  
  152  static void
  153: IjkMediaPlayer_setDataSourceAndHeaders(
  154      JNIEnv *env, jobject thiz, jstring path,
  155      jobjectArray keys, jobjectArray values)
  ...
  176  
  177  static void
  178: IjkMediaPlayer_setDataSourceFd(JNIEnv *env, jobject thiz, jint fd)
  179  
  180      MPTRACE("%s\\n", __func__);
  ...
  199  
  200  static void
  201: IjkMediaPlayer_setDataSourceCallback(JNIEnv *env, jobject thiz, jobject callback)
  202  
  203      MPTRACE("%s\\n", __func__);
  ...
 1072  static JNINativeMethod g_methods[] = 
 1073      
 1074:         "_setDataSource",
 1075          "(Ljava/lang/String;[Ljava/lang/String;[Ljava/lang/String;)V",
 1076:         (void *) IjkMediaPlayer_setDataSourceAndHeaders
 1077      ,
 1078:      "_setDataSourceFd",       "(I)V",     (void *) IjkMediaPlayer_setDataSourceFd ,
 1079:      "_setDataSource",         "(Ltv/danmaku/ijk/media/player/misc/IMediaDataSource;)V", (void *)IjkMediaPlayer_setDataSourceCallback ,
 1080       "_setAndroidIOCallback",  "(Ltv/danmaku/ijk/media/player/misc/IAndroidIO;)V", (void *)IjkMediaPlayer_setAndroidIOCallback ,
 1081  

即知,在Android版本的ijkplayer,入口即为ijkmedia\\ijkplayer\\android\\ijkplayer_jni.c

在IjkMediaPlayer.java及ijkplayer_jni.c文件中增加setGLFilter方法:

//增加setGLFilter方法
static void IjkMediaPlayer_native_setGLFilter(JNIEnv *env, jclass clazz,jobject filter)





// ----------------------------------------------------------------------------

static JNINativeMethod g_methods[] = 
    
        "_setDataSource",
        "(Ljava/lang/String;[Ljava/lang/String;[Ljava/lang/String;)V",
        (void *) IjkMediaPlayer_setDataSourceAndHeaders
    ,
     "_setDataSourceFd",       "(I)V",     (void *) IjkMediaPlayer_setDataSourceFd ,
     "_setDataSource",         "(Ltv/danmaku/ijk/media/player/misc/IMediaDataSource;)V", (void *)IjkMediaPlayer_setDataSourceCallback ,
    //···省略其他方法
     "_setGLFilter",           "(Ltv/danmaku/ijk/media/player/IjkFilter;)V", (void *) IjkMediaPlayer_native_setGLFilter ,
;

渲染时回调用户设置的GLFilter相关方法

在ijkmedia/ijksdl/gles2/internal.h文件中,IJK_GLES2_Renderer结构体内增加:

typedef struct IJK_GLES2_Renderer

    //...

    GLuint frame_buffers[1];
    GLuint frame_textures[1];

    int hasFilter=0;
    void (* func_onCreate)(void);
    void (* func_onSizeChanged)(int width,int height);
    void (* func_onDrawFrame)(int textureId);

    //...
 IJK_GLES2_Renderer;

这三个方法即为IjkFlter的三个方法,将会在Jni里面,将Java中设置的IjkFilter对象的三个方法与之对应起来。

全局搜索glDraw搜索到只有一个在renderer.c的IJK_GLES2_Renderer_renderOverlay方法中,渲染工作也是此方法执行的。当然,IjkPlayer利用OpenGLES渲染时,会根据从视频中解码出来的数据具体格式来进行渲染,比如yuv420p、yuv420sp、rbg565等等诸多格式。具体在ijkmedia/ijksdl/gles2/下找到,renderer_rgb.c\\renderer.yuv420p.c等等都是。

当用户在Java层设置了GLFilter时,GLFilter的三个方法应该在合适的时候被C回调,从名字可以看出来,这三个方法,和GLSurfaceView.Renderer接口中定义的三个方法其实是一样的。具体在IJK_GLES2_Renderer_renderOverlay方法中的修改如下:

GLboolean IJK_GLES2_Renderer_renderOverlay(IJK_GLES2_Renderer *renderer, SDL_VoutOverlay *overlay)

    /*用户设置了fitler,而且没有创建过framebuffer,创建framebuffer,依旧利用
    IjkPlayer里面原来的流程,就yuv或rgb的数据,渲染到一个texture上面去,然后将
    这个texture作为原始数据传递给java层进行处理。
    */
    if(renderer->hasFilter&&!renderer->frame_buffers[0]&&renderer->frame_width>0&&renderer->frame_height>0)
        //创建一个texture,用来接受将不同格式的视频帧数据,渲染成一个纹理
        glGenTextures(1,renderer->frame_textures);
        glBindTexture(GL_TEXTURE_2D,renderer->frame_textures[0]);
        glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,renderer->frame_width,renderer->frame_height,0,GL_RGBA,GL_UNSIGNED_BYTE,NULL); 
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        glBindTexture(GL_TEXTURE_2D,0);

        //创建framebuffer来挂载纹理,以渲染视频帧
        glGenFramebuffers(1,renderer->frame_buffers);
        glBindFramebuffer(GL_FRAMEBUFFER,renderer->frame_buffers[0]);
        glFramebufferTexture2D(GL_FRAMEBUFFER,GL_COLOR_ATTACHMENT0,GL_TEXTURE_2D,renderer->frame_textures[0],0);
        // int r;
        // if ((r = glCheckFramebufferStatus(GL_FRAMEBUFFER)) != GL_FRAMEBUFFER_COMPLETE)
        // 
        //     ALOGE("wuwang: Error in Framebuffer 0x%x", r);
        // else
        //     ALOGE("wuwang: glCheckFramebufferStatus 0x%x", r);
        // 
        glBindFramebuffer(GL_FRAMEBUFFER,0);
        //调用Java传递进来的Filter的onCreated方法及onSizeChanged方法
        renderer->func_onCreated();
        renderer->func_onSizeChanged(renderer->frame_width,renderer->frame_height);
        ALOGE("wuwang: create frame_buffers and textures %d,%d",renderer->frame_width,renderer->frame_height);
    

    //用户设置了Filter,就挂载frameBuffer,否则就按照原来的流程直接渲染到屏幕上
    if(renderer->hasFilter&&renderer->frame_buffers[0])
        GLint bindFrame;
        glGetIntegerv(GL_FRAMEBUFFER_BINDING,&bindFrame);
        ALOGE("wuwang: default frame binding %d",bindFrame);
        glBindFramebuffer(GL_FRAMEBUFFER,renderer->frame_buffers[0]);
        // glFramebufferTexture2D(GL_FRAMEBUFFER,GL_COLOR_ATTACHMENT0,GL_TEXTURE_2D,renderer->frame_textures[0],0);
        /* 这句一定要加上,否则无法增加了Filter之后,启用了其他GLProgram,无法渲染原始视频到Texture上去了 */
        IJK_GLES2_Renderer_use(renderer);
    

    if (!renderer || !renderer->func_uploadTexture)
        return GL_FALSE;

    glClear(GL_COLOR_BUFFER_BIT);               IJK_GLES2_checkError_TRACE("glClear");

    ALOGE("wuwang: frame buffer id:%d",renderer->frame_buffers[0]);
    GLsizei visible_width  = renderer->frame_width;
    GLsizei visible_height = renderer->frame_height;
    if (overlay) 
        visible_width  = overlay->w;
        visible_height = overlay->h;
        if (renderer->frame_width   != visible_width    ||
            renderer->frame_height  != visible_height   ||
            renderer->frame_sar_num != overlay->sar_num ||
            renderer->frame_sar_den != overlay->sar_den) 

            renderer->frame_width   = visible_width;
            renderer->frame_height  = visible_height;
            renderer->frame_sar_num = overlay->sar_num;
            renderer->frame_sar_den = overlay->sar_den;

            renderer->vertices_changed = 1;
        

        renderer->last_buffer_width = renderer->func_getBufferWidth(renderer, overlay);

        if (!renderer->func_uploadTexture(renderer, overlay))
            return GL_FALSE;
        
     else 
        // NULL overlay means force reload vertice
        renderer->vertices_changed = 1;
    

    GLsizei buffer_width = renderer->last_buffer_width;
    if (renderer->vertices_changed ||
        (buffer_width > 0 &&
         buffer_width > visible_width &&
         buffer_width != renderer->buffer_width &&
         visible_width != renderer->visible_width))
        if(renderer->hasFilter&&renderer->frame_buffers[0])
            renderer->func_onSizeChanged(renderer->frame_width,renderer->frame_height);
        
        renderer->vertices_changed = 0;

        IJK_GLES2_Renderer_Vertices_apply(renderer);
        IJK_GLES2_Renderer_Vertices_reset(renderer);
        IJK_GLES2_Renderer_Vertices_reloadVertex(renderer);

        renderer->buffer_width  = buffer_width;
        renderer->visible_width = visible_width;

        GLsizei padding_pixels     = buffer_width - visible_width;
        GLfloat padding_normalized = ((GLfloat)padding_pixels) / buffer_width;

        IJK_GLES2_Renderer_TexCoords_reset(renderer);
        IJK_GLES2_Renderer_TexCoords_cropRight(renderer, padding_normalized);
        IJK_GLES2_Renderer_TexCoords_reloadVertex(renderer);
    

    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);      IJK_GLES2_checkError_TRACE("glDrawArrays");

    //用户设置了Filter,就取消挂载FrameBuffer,并调用Filter的onDrawFrame方法。
    if(renderer->hasFilter&&renderer->frame_buffers[0])
        glBindFramebuffer(GL_FRAMEBUFFER,0);
        renderer->func_onDrawFrame(renderer->frame_textures[0]);
        // renderer->func_onDrawFrame(renderer->plane_textures[0]);
    
    return GL_TRUE;

GLFilter从设置到调用实现分析

上面已经完成的接口的编写,也做好执行的编写。现在需要将接口传递进来的GLFilter的三个方法与执行的三个方法对应起来,才能是用户的Filter真正发挥作用。

IJK_GLES2_Renderer的创建是根据SDL_VoutOverlay来的,在查找SDL_VoutOverlay从哪里来的,一路可以搜索到ijkmedia/ijksdl/android/ijksdl_vout_android_nativewindow.c中的func_create_overlay方法:

static SDL_VoutOverlay *func_create_overlay(int width, int height, int frame_format, SDL_Vout *vout)

    SDL_LockMutex(vout->mutex);
    SDL_VoutOverlay *overlay = func_create_overlay_l(width, height, frame_format, vout);
    SDL_UnlockMutex(vout->mutex);
    return overlay;

SDL_VoutOverlay的创建和SDL_Vout有关,再查找SDL_Vout的来源,可以找到
ijkmedia/ijksdl/android/ijksdl_vout_android_nativewindow.c中的SDL_VoutAndroid_CreateForANativeWindow

SDL_Vout *SDL_VoutAndroid_CreateForANativeWindow()

    SDL_Vout *vout = SDL_Vout_CreateInternal(sizeof(SDL_Vout_Opaque));
    if (!vout)
        return NULL;

    SDL_Vout_Opaque *opaque = vout->opaque;
    opaque->native_window = NULL;
    if (ISDL_Array__init(&opaque->overlay_manager, 32))
        goto fail;
    if (ISDL_Array__init(&opaque->overlay_pool, 32))
        goto fail;

    opaque->egl = IJK_EGL_create();
    if (!opaque->egl)
        goto fail;

    vout->opaque_class    = &g_nativewindow_class;
    vout->create_overlay  = func_create_overlay;
    vout->free_l          = func_free_l;
    vout->display_overlay = func_display_overlay;

    return vout;
fail:
    func_free_l(vout);
    return NULL;

它的初始化,再没啥可以关联了,那就只能找调用它的地方了。搜索后发现SDL_VoutAndroid_CreateForANativeWindow只在ijkmedia\\ijksdl\\android\\ijksdl_vout_android_surface.c的SDL_VoutAndroid_CreateForAndroidSurface方法:

SDL_Vout *SDL_VoutAndroid_CreateForAndroidSurface()

    return SDL_VoutAndroid_CreateForANativeWindow();

看来是被包了一层皮,那就接着查找SDL_VoutAndroid_CreateForAndroidSurface,搜索到调用它的为ijkmedia\\ijkplayer\\android\\ijkplayer_android.c的ijkmp_android_create方法:

IjkMediaPlayer *ijkmp_android_create(int(*msg_loop)(void*))

    IjkMediaPlayer *mp = ijkmp_create(msg_loop);
    if (!mp)
        goto fail;

    mp->ffplayer->vout = SDL_VoutAndroid_CreateForAndroidSurface();
    if (!mp->ffplayer->vout)
        goto fail;

    mp->ffplayer->pipeline = ffpipeline_create_from_android(mp->ffplayer);
    if (!mp->ffplayer->pipeline)
        goto fail;

    ffpipeline_set_vout(mp->ffplayer->pipeline, mp->ffplayer->vout);

    return mp;

fail:
    ijkmp_dec_ref_p(&mp);
    return NULL;

可以看到ijkmp_android_create返回了一个IjkMediaPlayer,这个在Java中也有一个这样的类,那么曙光应该就不远了。
再搜索ijkmp_android_create,结果调用它的只有ijkmedia\\ijkplayer\\android\\ijkplayer_jni.c中的IjkMediaPlayer_native_setup方法,到了这里,就可以将IjkFilter传递下去了。

在上面的过程中,可以看到从renderer.c到jni,IJK_GLES2_Renderer的创建,依赖SDL_VoutOverlay。SDL_VoutOverlay的创建依赖SDL_Vout。SDL_Vout是FFPlayer的成员,而FFPlayer又是IjkMediaPlayer的成员变量。Java层的IjkMediaPlayer依赖于IjkMediaPlayer

从GLFilter到IJK_GLES2_Renderer

根据上面的分析,可以知道,在jni中增加的setGLFilter的方法中,我们可以将GLFilter的方法传递给IjkMediaPlayer->FFPlayer->SDLVout,然后再传递给SDL_VoutOverlay,再由SDL_VoutOverlay传递给IJK_GLES2_Renderer即可。这样将增加Filter的功能增加进去了,也不会影响IjkPlayer的流程,让ios同样能够快速的实现增加GPU滤镜的功能。

先在SDL_VoutOverlay和SDL_Vout中的结构体定义中(ijkmedia/ijksdl/ijksdl_vout.h文件中)同样加入在IJK_GLES2_Renderer中增加的成员:

struct SDL_VoutOverlay 
    //...
    int hasFilter;
    void (* func_onCreated)(void);
    void (* func_onSizeChanged)(int width,int height);
    int (* func_onDrawFrame)(int textureId);
    //...
;
struct SDL_Vout 
    //...
    int hasFilter;
    void (* func_onCreated)(void);
    void (* func_onSizeChanged)(int width,int height);
    int (* func_onDrawFrame)(int textureId);
    //...
;

然后在上述几个方法,分别完成这几个成员数据从SDL_Vout到SDL_VoutOverlay,再到IJK_GLES2_Renderer的传递。
分别为:
ijkmedia\\ijksdl\\gles2\\renderer.c文件中IJK_GLES2_Renderer_create方法

IJK_GLES2_Renderer *IJK_GLES2_Renderer_create(SDL_VoutOverlay *overlay)

    if (!overlay)
        return NULL;

    //中间省略...
    renderer->format = overlay->format;

    //增加的内容
    renderer->hasFilter=overlay->hasFilter;
    renderer->func_onCreated=overlay->func_onCreated;
    renderer->func_onSizeChanged=overlay->func_onSizeChanged;
    renderer->func_onDrawFrame=overlay->func_onDrawFrame;

    return renderer;

ijksdl\\android\\ijksdl_vout_android_nativewindow.c文件中func_create_overlay方法

static SDL_VoutOverlay *func_create_overlay(int width, int height, int frame_format, SDL_Vout *vout)

    SDL_LockMutex(vout->mutex);
    SDL_VoutOverlay *overlay = func_create_overlay_l(width, height, frame_format, vout);
    //增加的内容
    overlay->hasFilter=vout->hasFilter;
    overlay->func_onCreated=vout->func_onCreated;
    overlay->func_onSizeChanged=vout->func_onSizeChanged;
    overlay->func_onDrawFrame=vout->func_onDrawFrame;

    SDL_UnlockMutex(vout->mutex);
    return overlay;

最后还需要完成SDL_Vout中这几个成员的赋值,并调用Java传入的GLFilter对象的相关方法(ijkplayer_jni.c文件中):

static JNIEnv * mEnv;
static jobject mFilter;
static jmethodID onCreatedMethod;
static jmethodID onSizeChangedMethod;
static jmethodID onDrawFrameMethod;

void onCreated()
    if(!mEnv)
        (*g_jvm)->AttachCurrentThread(g_jvm,&mEnv,NULL);
        jclass filterClass=(*mEnv)->GetObjectClass(mEnv,mFilter);
        onCreatedMethod=(*mEnv)->GetMethodID(mEnv,filterClass,"onCreated","()V");
        onSizeChangedMethod=(*mEnv)->GetMethodID(mEnv,filterClass,"onSizeChanged","(II)V");
        onDrawFrameMethod=(*mEnv)->GetMethodID(mEnv,filterClass,"onDrawFrame","(I)I");
        (*g_jvm)->DetachCurrentThread(g_jvm);
    
    if(onCreatedMethod)
        (*g_jvm)->AttachCurrentThread(g_jvm,&mEnv,NULL);
        (*mEnv)->CallVoidMethod(mEnv,mFilter,onCreatedMethod);
        (*g_jvm)->DetachCurrentThread(g_jvm);
    


void onSizeChanged(int width,int height)
    if(onSizeChangedMethod)
        (*g_jvm)->AttachCurrentThread(g_jvm,&mEnv,NULL);
        (*mEnv)->CallVoidMethod(mEnv,mFilter,onSizeChangedMethod,width,height);
        (*g_jvm)->DetachCurrentThread(g_jvm);
    


int onDrawFrame(int textureId)
    if(onDrawFrameMethod)
        (*g_jvm)->AttachCurrentThread(g_jvm,&mEnv,NULL);
        int ret=(*mEnv)->CallIntMethod(mEnv,mFilter,onDrawFrameMethod,textureId);
        (*g_jvm)->DetachCurrentThread(g_jvm);
        return ret;
    
    return textureId;


/*注意不能直接保存env,filter然后在onDrawFrame等方法中使用,因为这三个方法的调用与setGLFilter不是在同一个线程中*/
static void IjkMediaPlayer_native_setGLFilter(JNIEnv *env, jobject clazz, jobject filter)

    if(mFilter)
        (*env)->DeleteGlobalRef(env,mFilter);
    
    IjkMediaPlayer *mp = jni_get_media_player(env, clazz);
    if(filter!=NULL)
        mFilter=(*env)->NewGlobalRef(env,filter);
        mp->ffplayer->vout->hasFilter=1;
        mp->ffplayer->vout->func_onCreated=onCreated;
        mp->ffplayer->vout->func_onSizeChanged=onSizeChanged;
        mp->ffplayer->vout->func_onDrawFrame=onDrawFrame;
    else
        mp->ffplayer->vout->hasFilter=0;
    

至此,Java一直到sdl中的renderer就算连通了。在Java中的处理就和GLSurfaceView设置Renderer基本一致了,不同的是,我们给IjkPlayer中增加的GLFilter,已经提供了一个原始的视频图像作为onDrawFrame的参数,在GLFilter中,只需要处理这个Texture并渲染出来就可以了。

插入滤镜示例

将修改后的代码重新编译下,编译后的库会自动更新到Ijkplayer的Android工程下,设置自定义的滤镜后,不出意外就可以看到效果了。以下分别为原始视频、黑白滤镜处理后的视频、增加了AiyaEffectsSDK并设置了特效的视频效果,因为CSDN对图片大小限制的问题,都是截取了一小段:

工程太大了,修改的地方也不算多,就不上传代码了。有需要的朋友根据以上流程下载ijkplayer源码自行修改即可,同时也可以看看Ijkplayer的源码。

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GPU图像过滤器[关闭]

-webkit-transform:translate3d(0,0,0)触发GPU加速,让网页动画更流畅

通过IE私有滤镜让IE6 7 8支持背景透明,内容不透明效果。