NDK学习笔记(十四) 使用AVILib+window创建一个AVI视频播放器

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文章目录

1.window api
2.主要代码
3.实现效果

1.window api

（1）从surface对象中检索原生window

从surface中检索对象window
ANativeWindow* ANativeWindow_fromSurface(JNIEnv* env, jobject surface);

（2）获取原生window实例中的应用

void ANativeWindow_acquire(ANativeWindow* window);

（3）释放原生window引用

void ANativeWindow_release(ANativeWindow* window);

（4）检索原生window信息

宽度
int32_t ANativeWindow_getWidth(ANativeWindow* window);

宽度
int32_t ANativeWindow_getHeight(ANativeWindow* window);

像素格式
int32_t ANativeWindow_getFormat(ANativeWindow* window);

（5）设置原生window缓冲区的几何形状

int32_t ANativeWindow_setBuffersGeometry(ANativeWindow* window,int32_t width, int32_t height, int32_t format);

（6）访问原生window缓冲区

int32_t ANativeWindow_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,ARect* inOutDirtyBounds);

（7）释放原生window缓冲区

int32_t ANativeWindow_unlockAndPost(ANativeWindow* window);

2.主要代码

java

public class NativeWindowPlayerActivity extends AbstractPlayerActivity {private final AtomicBoolean isPlaying = new AtomicBoolean();private SurfaceHolder surfaceHolder;SurfaceView surfaceView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_native_window_player);surfaceView = findViewById(R.id.surface_view);surfaceHolder = surfaceView.getHolder();surfaceHolder.addCallback(callback);}@Overrideprotected void onStart() {super.onStart();int w = getWidth(avi);int h = getHeight(avi);//设置surfaceView的带大小，防止自动填充ViewGroup.LayoutParams viewGroup = surfaceView.getLayoutParams();viewGroup.width = w;viewGroup.height = h;surfaceView.setX(50);surfaceView.setY(50);}private final SurfaceHolder.Callback callback = new SurfaceHolder.Callback2() {@Overridepublic void surfaceRedrawNeeded(SurfaceHolder holder) {}@Overridepublic void surfaceCreated(SurfaceHolder holder) {isPlaying.set(true);}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {isPlaying.set(true);new Thread(renderer).start();}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {isPlaying.set(false);}};private Runnable renderer = new Runnable() {@Overridepublic void run() {Surface surface = surfaceHolder.getSurface();init(avi, surface);long frameDelay = (long) (1000 / getFrameRate(avi));while (isPlaying.get()) {render(avi, surface);try {Thread.sleep(frameDelay);} catch (InterruptedException e) {break;}}}};/*** 初始化原生window** @param avi* @param surface*/private native static void init(long avi, Surface surface);/*** 渲染* @param avi* @param surface* @return*/private native static boolean render(long avi, Surface surface);
}

原生代码

#include "cn_study_aviplayer_NativeWindowPlayerActivity.h"extern "C" {
#include  "avilib/avilib.h"
}#include <android/native_window.h>
#include <android/native_window_jni.h>
#include "Common.h"extern "C"
JNIEXPORT void JNICALL
Java_cn_study_aviplayer_NativeWindowPlayerActivity_init(JNIEnv *env, jclass clazz, jlong avi,jobject surface) {//从surface中获取原生windowANativeWindow *nativeWindow = ANativeWindow_fromSurface(env, surface);if (0 == nativeWindow) {ThrowException(env, "java/io/RuntimeException", "不能都获取window");goto exit;}//设置buffer大小为avi视频帧的分辨率//如果和window的物理大小不一致//buffer会被缩放来匹配这个大小if (0 > ANativeWindow_setBuffersGeometry(nativeWindow, AVI_video_width((avi_t *) avi),AVI_video_height((avi_t *) avi),WINDOW_FORMAT_RGB_565)) {ThrowException(env, "java/io/RuntimeException", "不能够设置buffers");nativeWindow = 0;}exit:return;}extern "C"
JNIEXPORT jboolean JNICALL
Java_cn_study_aviplayer_NativeWindowPlayerActivity_render(JNIEnv *env, jclass clazz, jlong avi,jobject surface) {jboolean isFrameRead = JNI_FALSE;long frameSize = 0;int keyFrame = 0;ANativeWindow *nativeWindow = ANativeWindow_fromSurface(env, surface);if (0 == nativeWindow) {ThrowException(env, "java/io/RuntimeException", "不能够获取window");goto exit;}//锁定原生window并访问原始bufferANativeWindow_Buffer windowBuffer;if (0 > ANativeWindow_lock(nativeWindow, &windowBuffer, 0)) {ThrowException(env, "java/io/RuntimeException", "不能锁住window");goto release;}//将avi帧的比特流读至原始缓冲区frameSize = AVI_read_frame((avi_t *) avi, (char *) windowBuffer.bits, &keyFrame);//是否读取成功if (0 < frameSize) {isFrameRead = JNI_TRUE;}//解锁并且输出缓冲区来显示if (0 > ANativeWindow_unlockAndPost(nativeWindow)) {ThrowException(env, "java/io/RuntimeException", "不能够解锁window");goto release;}release:ANativeWindow_release(nativeWindow);nativeWindow = 0;exit:return isFrameRead;}

配置cmake
jnigraphics与android会冲突，所以加了前缀-l。

cmake_minimum_required(VERSION 3.4.1)add_library( # Sets the name of the library.native-lib# Sets the library as a shared library.SHARED# Provides a relative path to your source file(s).native-lib.cppCommon.cppcn_study_aviplayer_BitmapPlayerActivity.cppcn_study_aviplayer_OpenGLPlayerActivity.cppcn_study_aviplayer_NativeWindowPlayerActivity.cpp)
#添加子目录
add_subdirectory(avilib)find_library( # Sets the name of the path variable.log-lib# Specifies the name of the NDK library that# you want CMake to locate.log)find_library(GLESv2-lib-lGLESv2)find_library(android-lib-landroid)target_link_libraries( # Specifies the target library.native-lib# Links the target library to the log library# included in the NDK.-ljnigraphics#开启jnigraphics${android-lib}#使用window${log-lib}${GLESv2-lib}avi-lib)