欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

ijkplayer源码分析之surface与opengl关联初始化(一)

程序员文章站 2022-07-13 15:43:41
...

ijkplayer源码分析之opengl与surface关联初始化

=====================================================

ijkplayer源码分析系列文章列表:

ijkplayer源码分析之surface与opengl es关联初始化(一)

ijkplayer源码分析之audio与opensl es初始化(二)

======================================================

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_setup

IjkMediaPlayer_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 window
    int              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

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

ijkplayer源码分析之surface与opengl关联初始化(一)

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

流程图

ijkplayer源码分析之surface与opengl关联初始化(一)

流程图.jpg



作者:ytxhao
链接:https://www.jianshu.com/p/84151c863c72
来源:简书
著作权归作者所有。商业转载请联系作者获得授权,非商业转载请注明出处。

相关标签: video android