ijkplayer源码分析之surface与opengl关联初始化

转自：https://www.jianshu.com/p/84151c863c72

上层java代码

IjkMediaPlayer.java

构造方法

step 1：
IjkMediaPlayer()|--this(sLocalLibLoader);|--initPlayer(libLoader);|--loadLibrariesOnce(libLoader); //加载所需要的库|   |--libLoader.loadLibrary("ijkffmpeg");|   |--libLoader.loadLibrary("ijksdl");|   |--libLoader.loadLibrary("ijkplayer"); // step 2： |--initNativeOnce(); |   |--native_init(); //初始化 native || |--native_setup(new WeakReference<IjkMediaPlayer>(this)); //step 3:

底层c代码

IjkMediaPlayer.java --> ijkplayer_jni.c

step 2.5:
native_init() --> IjkMediaPlayer_native_init
//底层是个空实现
IjkMediaPlayer_native_init(JNIEnv *env)
{MPTRACE("%s\n", __func__);
}step 3：
native_setup --> IjkMediaPlayer_native_setupIjkMediaPlayer_native_setup(JNIEnv *env, jobject thiz, jobject weak_this)
{IjkMediaPlayer *mp = ijkmp_android_create(message_loop); //创建一个 player 结构体jni_set_media_player(env, thiz, mp); //保存当前player结构体ijkmp_set_weak_thiz(mp, (*env)->NewGlobalRef(env, weak_this));ijkmp_set_inject_opaque(mp, ijkmp_get_weak_thiz(mp));ijkmp_set_ijkio_inject_opaque(mp, ijkmp_get_weak_thiz(mp));ijkmp_android_set_mediacodec_select_callback(mp, mediacodec_select_callback, ijkmp_get_weak_thiz(mp));LABEL_RETURN:ijkmp_dec_ref_p(&mp);
}

加载class的宏定义

j4a_allclasses.loader.h  //头文件中包含加载class的宏定义J4A_LOAD_CLASS(java_nio_Buffer);
J4A_LOAD_CLASS(java_nio_ByteBuffer);
J4A_LOAD_CLASS(java_util_ArrayList);
J4A_LOAD_CLASS(android_media_AudioTrack);
J4A_LOAD_CLASS(android_media_MediaCodec);
J4A_LOAD_CLASS(android_media_MediaFormat);
J4A_LOAD_CLASS(android_media_PlaybackParams);
J4A_LOAD_CLASS(android_os_Build);
J4A_LOAD_CLASS(android_os_Bundle);
J4A_LOAD_CLASS(tv_danmaku_ijk_media_player_misc_IMediaDataSource);
J4A_LOAD_CLASS(tv_danmaku_ijk_media_player_misc_IIjkIOHttp);
J4A_LOAD_CLASS(tv_danmaku_ijk_media_player_IjkMediaPlayer);

#define J4A_LOAD_CLASS(class__)  --> J4A_loadClass__J4AC_##class__(env)
--> J4A_loadClass__J4AC_IjkMediaPlayer
or
--> J4A_loadClass__J4AC_MediaCodec

class初始化流程

step 2:
Ijksdl_android_jni.c
JNI_OnLoad(JavaVM *vm, void *reserved)|--J4A_LoadAll__catchAll(env);

J4a_allclasses.c
J4A_LoadAll__catchAll(JNIEnv *env)  //调用头文件中的宏定义函数|--#include "j4a/j4a_allclasses.loader.h"|--J4A_LOAD_CLASS(tv_danmaku_ijk_media_player_IjkMediaPlayer);|--J4A_loadClass__J4AC_##class__(env);|--J4A_loadClass__J4AC_tv_danmaku_ijk_media_player_IjkMediaPlayer（env）|--class_id = class_J4AC_tv_danmaku_ijk_media_player_IjkMediaPlayer.id;|--name     = "mNativeMediaPlayer";|--sign     = "J";|--class_J4AC_tv_danmaku_ijk_media_player_IjkMediaPlayer.field_mNativeMediaPlayer = J4A_GetFieldID__catchAll(env, class_id, name, sign);

IjkMediaPlayer结构体

struct IjkMediaPlayer {volatile int ref_count;pthread_mutex_t mutex;FFPlayer *ffplayer;int (*msg_loop)(void*);SDL_Thread *msg_thread;SDL_Thread _msg_thread;int mp_state;char *data_source;void *weak_thiz;int restart;int restart_from_beginning;int seek_req;long seek_msec;
};

step 3的创建player过程

SDL_Class结构体变量

typedef struct SDL_Class {const char *name;
} SDL_Class;static SDL_Class g_class = {.name = "EGL",
};static SDL_Class g_nativewindow_class = {.name = "ANativeWindow_Vout",
};static SDL_Class g_pipeline_class = {.name = "ffpipeline_ffplay",
};

SDL_Vout结构体

struct SDL_Vout {SDL_mutex *mutex;SDL_Class       *opaque_class;SDL_Vout_Opaque *opaque;SDL_VoutOverlay *(*create_overlay)(int width, int height, int frame_format, SDL_Vout *vout);void (*free_l)(SDL_Vout *vout);int (*display_overlay)(SDL_Vout *vout, SDL_VoutOverlay *overlay);Uint32 overlay_format;
};

SDL_Vout_Opaque结构体

typedef struct SDL_Vout_Opaque {ANativeWindow   *native_window;SDL_AMediaCodec *acodec;int              null_native_window_warned; // reduce log for null windowint              next_buffer_id;ISDL_Array       overlay_manager;ISDL_Array       overlay_pool;IJK_EGL         *egl;
} SDL_Vout_Opaque;

IJKFF_Pipeline结构体

struct IJKFF_Pipeline {SDL_Class             *opaque_class;IJKFF_Pipeline_Opaque *opaque;void            (*func_destroy)             (IJKFF_Pipeline *pipeline);IJKFF_Pipenode *(*func_open_video_decoder)  (IJKFF_Pipeline *pipeline, FFPlayer *ffp);SDL_Aout       *(*func_open_audio_output)   (IJKFF_Pipeline *pipeline, FFPlayer *ffp);
};

IjkMediaPlayer_native_setup(JNIEnv *env, jobject thiz, jobject weak_this)|--IjkMediaPlayer *mp = ijkmp_android_create(message_loop);|--IjkMediaPlayer *mp = ijkmp_create(msg_loop);|--mp->ffplayer->vout = SDL_VoutAndroid_CreateForAndroidSurface(); //创建surface用于视频输出|   |--SDL_VoutAndroid_CreateForANativeWindow();|       |--SDL_Vout_CreateInternal(size_t opaque_size)|       |   |--SDL_Vout *vout = (SDL_Vout*) calloc(1, sizeof(SDL_Vout));|       ||       |--SDL_Vout_Opaque *opaque = vout->opaque;|       |--opaque->native_window = NULL;|       |--opaque->egl = IJK_EGL_create();创建egl结构体|       |       |--IJK_EGL *egl = (IJK_EGL*) mallocz(sizeof(IJK_EGL));|       |       |--egl->opaque_class = &g_class;|       |       |--egl->opaque = mallocz(sizeof(IJK_EGL_Opaque));|       ||       |--vout->opaque_class    = &g_nativewindow_class;|       |--vout->create_overlay  = func_create_overlay;|       |--vout->free_l          = func_free_l;|       |--vout->display_overlay = func_display_overlay|       ||--mp->ffplayer->pipeline = ffpipeline_create_from_android(mp->ffplayer); //创建ffplay管线|   |--IJKFF_Pipeline *pipeline = ffpipeline_alloc(&g_pipeline_class, sizeof(IJKFF_Pipeline_Opaque));|   |--IJKFF_Pipeline_Opaque *opaque = pipeline->opaque;|   |--opaque->ffp                   = ffp;|   |--opaque->surface_mutex         = SDL_CreateMutex();|   |--opaque->left_volume           = 1.0f;|   |--opaque->right_volume          = 1.0f;|   |--pipeline->func_destroy            = func_destroy;|   |--pipeline->func_open_video_decoder = func_open_video_decoder;|   |--pipeline->func_open_audio_output  = func_open_audio_output;|||--ffpipeline_set_vout(mp->ffplayer->pipeline, mp->ffplayer->vout); //将管线和视频输出关联|--IJKFF_Pipeline_Opaque *opaque = pipeline->opaque;|--opaque->weak_vout = vout;

初始化总结

在step 1中进行IjkMediaPlayer实例的构造,构造过程中完成的step 2加载so并在加载过程中将底层的一些信息保存到IjkMediaPlayer实例中
step 3将IjkMediaPlayer实例对象设置到底层IjkMediaPlayer结构体中,创建底层IjkMediaPlayer结构体。在创建结构体的同时设置message_loop回调函数实现将底层消息传递到上层的作用

初始化后个结构体的关联图

结构体关联图.jpg

到此完成了IJKPlayer的初始化

IjkMediaPlayer使用前的设置

IjkMediaPlayer被封装到了IjkVideoView中，在IjkVideoView实例化的过程中会完成上面的初始化过程。同时在构造函数中会将surface设置到底层,下面是初始化图像渲染环境的代码分析

以设置surfaceView为例：

step 1：
initVideoView()|--initRenders();|--setRender(mCurrentRender);|--renderView = new SurfaceRenderView(getContext());|   |--getHolder().addCallback(mSurfaceCallback); //当SurfaceRenderView被添加到屏幕显示时会回调 mSurfaceCallback 中的 surfaceCreated 方法，在 surfaceCreated 方法中又会调用注册到 renderView 中的 mSHCallback 实例的 onSurfaceCreated 方法|--setRenderView(renderView);|--mRenderView.addRenderCallback(mSHCallback);mSHCallback = new IRenderView.IRenderCallback() //在 mSHCallback 的 onSurfaceCreated 中将 mSurfaceHolder 赋值|--onSurfaceCreated()|--mSurfaceHolder = holder;                 step 2：setVideoPath()|--setVideoURI()|--openVideo();|--mMediaPlayer = createPlayer(mSettings.getPlayer());|--bindSurfaceHolder(mMediaPlayer, mSurfaceHolder); //完成了 mSurfaceHolder 赋值后就将它和 mMediaPlayer 进行绑定|--holder.bindToMediaPlayer(mp); 即 mSurfaceHolder.bindToMediaPlayer(mMediaPlayer)|--InternalSurfaceHolder.bindToMediaPlayer()|--mp.setDisplay(mSurfaceHolder); //即 mMediaPlayer.setDisplay(mSurfaceHolder)|--surface = sh.getSurface();|-- _setVideoSurface(surface); //native 方法设置surface到native

go to native _setVideoSurface

ijkplayer_jni.c

IjkMediaPlayer_setVideoSurface|--ijkmp_android_set_surface //go to Ijkplayer_android.c

Ijkplayer_android.c

ijkmp_android_set_surface(JNIEnv *env, jobject thiz, jobject jsurface)|--ijkmp_android_set_surface_l(env, mp, android_surface);|--SDL_VoutAndroid_SetAndroidSurface(env, mp->ffplayer->vout, android_surface); //Ijksdl_vout_android_surface.c|--ffpipeline_set_surface(env, mp->ffplayer->pipeline, android_surface);

Ijksdl_vout_android_surface.c

SDL_VoutAndroid_SetAndroidSurface(env, mp->ffplayer->vout, android_surface)|--native_window = ANativeWindow_fromSurface(env, android_surface);|--SDL_VoutAndroid_SetNativeWindow(vout, native_window); //Ijksdl_vout_android_nativewindow.c|--SDL_VoutAndroid_SetNativeWindow_l(vout, native_window);|--IJK_EGL_terminate(opaque->egl);|--SDL_VoutAndroid_invalidateAllBuffers_l(vout);|--if (opaque->native_window)|       |--ANativeWindow_release(opaque->native_window);|--if (native_window)|       |--ANativeWindow_acquire(native_window);|--opaque->native_window = native_window;

在上面的初始化的过程中就已经通过`IjkMediaPlayer_native_setup`函数对`SDL_Vout`结构中的回调函数，和egl信息进行了初始化。而`IjkMediaPlayer_setVideoSurface`则将`native_window`的地址保存到`SDL_Vout->opaque->native_window`中。到目前为止所有关于显示的信息都保存的了`SDL_Vout`结构体中.以便在`ff_player.c`文件中进行调用

下面展示了调用过程：

IjkMediaPlayer_prepareAsync //Ijkplayer_jni.c|--ijkmp_prepare_async|--ijkmp_prepare_async_l(IjkMediaPlayer *mp) //Ijkplayer.c|--ffp_prepare_async_l(FFPlayer *ffp, const char *file_name) //Ff_ffplay.c|--stream_open(FFPlayer *ffp, const char *filename, AVInputFormat *iformat)|--SDL_CreateThreadEx(&is->_video_refresh_tid, video_refresh_thread, ffp, "ff_vout");|   |--video_refresh_thread(void *arg)|       |--video_refresh(FFPlayer *opaque, double *remaining_time|           |--video_display2(FFPlayer *ffp)|               |--video_image_display2(FFPlayer *ffp)|                   |--SDL_VoutDisplayYUVOverlay(ffp->vout, vp->bmp);|                       |--vout->display_overlay(vout, overlay);  // vout->display_overlay = func_display_overlay;在SDL_VoutAndroid_CreateForANativeWindow中设置了回调函数|                           |--func_display_overlay|                               |--func_display_overlay_l(vout, overlay);|                                   |--IJK_EGL_display(opaque->egl, native_window, overlay);|                                   |   |--IJK_EGL_makeCurrent(egl, window)|                                   |   |   |--eglMakeCurrent(egl->display, egl->surface, egl->surface, egl->context)|                                   |   |--IJK_EGL_display_internal(egl, window, overlay);|                                   |   |   |--IJK_EGL_prepareRenderer(egl, overlay)|                                   |   |   |--IJK_GLES2_Renderer_renderOverlay(opaque->renderer, overlay)|                                   |   |   |--eglSwapBuffers(egl->display, egl->surface);|                                   |   ||                                   |   |--eglMakeCurrent(egl->display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);|                                   |--eglReleaseThread(); // FIXME: call at thread exit|--SDL_CreateThreadEx(&is->_read_tid, read_thread, ffp, "ff_read"); //创建视频文件读取线程

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