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001.#include <cutils/memory.h>
002.
003.#include <unistd.h>
004.#include <utils/Log.h>
005.
006.#include <binder/IPCThreadState.h>
007.#include <binder/ProcessState.h>
008.#include <binder/IServiceManager.h>
009.#include <media/stagefright/foundation/ADebug.h>
010.#include <gui/Surface.h>
011.#include <gui/SurfaceComposerClient.h>
012.#include <gui/ISurfaceComposer.h>
013.#include <ui/DisplayInfo.h>
014.#include <android/native_window.h>
015.#include <system/window.h>
016.#include <ui/GraphicBufferMapper.h>
017.//ANativeWindow 就是surface，对应surface.cpp里的code
018.using namespace android;
019.
020.//将x规整为y的倍数,也就是将x按y对齐
021.static int ALIGN(int x, int y) {
022. // y must be a power of 2.
023. return (x + y - 1) & ~(y - 1);
024.}
025.
026.void render(
027. const void *data, size_t size, const sp<ANativeWindow> &nativeWindow,int width,int height) {
028. sp<ANativeWindow> mNativeWindow = nativeWindow;
029. int err;
030. int mCropWidth = width;
031. int mCropHeight = height;
032.
033. int halFormat = HAL_PIXEL_FORMAT_YV12;//颜色空间
034. int bufWidth = (mCropWidth + 1) & ~1;//按2对齐
035. int bufHeight = (mCropHeight + 1) & ~1;
036.
037. CHECK_EQ(0,
038. native_window_set_usage(
039. mNativeWindow.get(),
040. GRALLOC_USAGE_SW_READ_NEVER | GRALLOC_USAGE_SW_WRITE_OFTEN
041. | GRALLOC_USAGE_HW_TEXTURE | GRALLOC_USAGE_EXTERNAL_DISP));
042.
043. CHECK_EQ(0,
044. native_window_set_scaling_mode(
045. mNativeWindow.get(),
046. NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW));
047.
048. // Width must be multiple of 32???
049. //很重要,配置宽高和和指定颜色空间yuv420
050. //如果这里不配置好，下面deque_buffer只能去申请一个默认宽高的图形缓冲区
051. CHECK_EQ(0, native_window_set_buffers_geometry(
052. mNativeWindow.get(),
053. bufWidth,
054. bufHeight,
055. halFormat));
056.
057.
058. ANativeWindowBuffer *buf;//描述buffer
059. //申请一块空闲的图形缓冲区
060. if ((err = native_window_dequeue_buffer_and_wait(mNativeWindow.get(),
061. &buf)) != 0) {
062. ALOGW("Surface::dequeueBuffer returned error %d", err);
063. return;
064. }
065.
066. GraphicBufferMapper &mapper = GraphicBufferMapper::get();
067.
068. Rect bounds(mCropWidth, mCropHeight);
069.
070. void *dst;
071. CHECK_EQ(0, mapper.lock(//用来锁定一个图形缓冲区并将缓冲区映射到用户进程
072. buf->handle, GRALLOC_USAGE_SW_WRITE_OFTEN, bounds, &dst));//dst就指向图形缓冲区首地址
073.
074. if (true){
075. size_t dst_y_size = buf->stride * buf->height;
076. size_t dst_c_stride = ALIGN(buf->stride / 2, 16);//1行v/u的大小
077. size_t dst_c_size = dst_c_stride * buf->height / 2;//u/v的大小
078.
079. memcpy(dst, data, dst_y_size + dst_c_size*2);//将yuv数据copy到图形缓冲区
080. }
081.
082. CHECK_EQ(0, mapper.unlock(buf->handle));
083.
084. if ((err = mNativeWindow->queueBuffer(mNativeWindow.get(), buf,
085. -1)) != 0) {
086. ALOGW("Surface::queueBuffer returned error %d", err);
087. }
088. buf = NULL;
089.}
090.
091.bool getYV12Data(const char *path,unsigned char * pYUVData,int size){
092. FILE *fp = fopen(path,"rb");
093. if(fp == NULL){
094. printf("read %s fail !!!!!!!!!!!!!!!!!!!
095.",path);
096. return false;
097. }
098. fread(pYUVData,size,1,fp);
099. fclose(fp);
100. return true;
101.}
102.
103.int main(void){
104. // set up the thread-pool
105. sp<ProcessState> proc(ProcessState::self());
106. ProcessState::self()->startThreadPool();
107.
108. // create a client to surfaceflinger
109. sp<SurfaceComposerClient> client = new SurfaceComposerClient();
110. sp<IBinder> dtoken(SurfaceComposerClient::getBuiltInDisplay(
111. ISurfaceComposer::eDisplayIdMain));
112. DisplayInfo dinfo;
113. //获取屏幕的宽高等信息
114. status_t status = SurfaceComposerClient::getDisplayInfo(dtoken, &dinfo);
115. printf("w=%d,h=%d,xdpi=%f,ydpi=%f,fps=%f,ds=%f
116.",
117. dinfo.w, dinfo.h, dinfo.xdpi, dinfo.ydpi, dinfo.fps, dinfo.density);
118. if (status)
119. return -1;
120. //创建surface
121. sp<SurfaceControl> surfaceControl = client->createSurface(String8("testsurface"),
122. dinfo.w, dinfo.h, PIXEL_FORMAT_RGBA_8888, 0);
123.
124./*************************get yuv data from file;****************************************/
125. printf("[%s][%d]
126.",__FILE__,__LINE__);
127. int width,height;
128. width = 320;
129. height = 240;
130. int size = width * height * 3/2;
131. unsigned char *data = new unsigned char[size];
132. const char *path = "/mnt/sdcard/yuv_320_240.yuv";
133. getYV12Data(path,data,size);//get yuv data from file;
134.
135./*********************配置surface*******************************************************************/
136. SurfaceComposerClient::openGlobalTransaction();
137. surfaceControl->setLayer(100000);//设定Z坐标
138. surfaceControl->setPosition(100, 100);//以左上角为(0,0)设定显示位置
139. surfaceControl->setSize(width, height);//设定视频显示大小
140. SurfaceComposerClient::closeGlobalTransaction();
141. sp<Surface> surface = surfaceControl->getSurface();
142. printf("[%s][%d]
143.",__FILE__,__LINE__);
144.
145./**********************显示yuv数据******************************************************************/
146. render(data,size,surface,width,height);
147. printf("[%s][%d]
148.",__FILE__,__LINE__);
149.
150. IPCThreadState::self()->joinThreadPool();//可以保证画面一直显示，否则瞬间消失
151. IPCThreadState::self()->stopProcess();
152. return 0;
153.}
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