ijkplayer源碼分析之surface與opengl關聯初始化(一)

ijkplayer源碼分析之opengl與surface關聯初始化

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ijkplayer源碼分析系列文章列表：

ijkplayer源碼分析之surface與opengl es關聯初始化(一)

ijkplayer源碼分析之audio與opensl es初始化(二)

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上層java代碼

• IjkMediaPlayer.java

構造方法

 

step 1： 
IjkMediaPlayer()
    |--this(sLocalLibLoader);
        |--initPlayer(libLoader);
            |--loadLibrariesOnce(libLoader); //加載所需要的庫
            |   |--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:

底層c代碼

IjkMediaPlayer.java --> ijkplayer_jni.c

 

step 2.5:
native_init() --> IjkMediaPlayer_native_init
//底層是個空實現
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); //創建一個 player 結構體

    jni_set_media_player(env, thiz, mp); //保存當前player結構體
    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);
}

加載class的宏定義

 

j4a_allclasses.loader.h  //頭文件中包含加載class的宏定義

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)  //調用頭文件中的宏定義函數
        |--#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結構體

 

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的創建player過程

SDL_Class結構體變量

 

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結構體

 

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結構體

 

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結構體

 

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(); //創建surface用於視頻輸出
        |   |--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();創建egl結構體
        |       |       |--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); //創建ffplay管線
        |   |--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); //將管線和視頻輸出關聯
            |--IJKFF_Pipeline_Opaque *opaque = pipeline->opaque;
            |--opaque->weak_vout = vout;

初始化總結

在step 1中進行IjkMediaPlayer實例的構造,構造過程中完成的step 2加載so並在加載過程中將底層的一些信息保存到IjkMediaPlayer實例中
step 3將IjkMediaPlayer實例對象設置到底層IjkMediaPlayer結構體中,創建底層IjkMediaPlayer結構體。在創建結構體的同時設置message_loop回調函數實現將底層消息傳遞到上層的作用

初始化後個結構體的關聯圖

結構體關聯圖.jpg

到此完成了IJKPlayer的初始化

IjkMediaPlayer使用前的設置

IjkMediaPlayer被封裝到了IjkVideoView中，在IjkVideoView實例化的過程中會完成上面的初始化過程。同時在構造函數中會將surface設置到底層,下面是初始化圖像渲染環境的代碼分析

以設置surfaceView爲例：

 

step 1：
initVideoView()
    |--initRenders();
        |--setRender(mCurrentRender);
            |--renderView = new SurfaceRenderView(getContext());
            |   |--getHolder().addCallback(mSurfaceCallback); //當SurfaceRenderView被添加到屏幕顯示時會回調 mSurfaceCallback 中的 surfaceCreated 方法，在 surfaceCreated 方法中又會調用註冊到 renderView 中的 mSHCallback 實例的 onSurfaceCreated 方法
            |--setRenderView(renderView);
                |--mRenderView.addRenderCallback(mSHCallback);

mSHCallback = new IRenderView.IRenderCallback() //在 mSHCallback 的 onSurfaceCreated 中將 mSurfaceHolder 賦值
    |--onSurfaceCreated()
        |--mSurfaceHolder = holder;                 

step 2：

setVideoPath()
    |--setVideoURI()
        |--openVideo();
            |--mMediaPlayer = createPlayer(mSettings.getPlayer());
            |--bindSurfaceHolder(mMediaPlayer, mSurfaceHolder); //完成了 mSurfaceHolder 賦值後就將它和 mMediaPlayer 進行綁定
                |--holder.bindToMediaPlayer(mp); 即 mSurfaceHolder.bindToMediaPlayer(mMediaPlayer)
                    |--InternalSurfaceHolder.bindToMediaPlayer()
                        |--mp.setDisplay(mSurfaceHolder); //即 mMediaPlayer.setDisplay(mSurfaceHolder)
                            |--surface = sh.getSurface();
                            |-- _setVideoSurface(surface); //native 方法設置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;

在上面的初始化的過程中就已經通過IjkMediaPlayer_native_setup函數對SDL_Vout結構中的回調函數，和egl信息進行了初始化。而IjkMediaPlayer_setVideoSurface則將native_window的地址保存到SDL_Vout->opaque->native_window中。到目前爲止所有關於顯示的信息都保存的了SDL_Vout結構體中.以便在ff_player.c文件中進行調用

下面展示了調用過程：

 

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中設置了回調函數
                |                           |--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"); //創建視頻文件讀取線程

流程圖

流程圖.jpg

作者：ytxhao
鏈接：https://www.jianshu.com/p/84151c863c72
來源：簡書
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