status_t VideoRender::render(const void *data, size_t size,int width,int height)
{
if(mCodecSurface==NULL){
return BAD_VALUE ;
}
// 本地窗口
sp<ANativeWindow> mNativeWindow = mSurface;
int err;
int mCropWidth = width;
int mCropHeight = height;
int halFormat = HAL_PIXEL_FORMAT_YCrCb_420_SP;//HAL_PIXEL_FORMAT_YV12;//颜色空间
int bufWidth = (mCropWidth + 1) & ~1;//按2对齐
int bufHeight = (mCropHeight + 1) & ~1;
// 参数校验
CHECK_EQ(0,
native_window_set_usage(
mNativeWindow.get(),
GRALLOC_USAGE_SW_READ_NEVER | GRALLOC_USAGE_SW_WRITE_OFTEN
| GRALLOC_USAGE_HW_TEXTURE | GRALLOC_USAGE_EXTERNAL_DISP));
CHECK_EQ(0,
native_window_set_scaling_mode(
mNativeWindow.get(),
NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW));
// Width must be multiple of 32???
//很重要,配置宽高和和指定颜色空间yuv420
//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
CHECK_EQ(0, native_window_set_buffers_geometry(
mNativeWindow.get(),
bufWidth,
bufHeight,
halFormat));
ANativeWindowBuffer *buf;//描述buffer
//申请一块空闲的图形缓冲区
if ((err = native_window_dequeue_buffer_and_wait(mNativeWindow.get(),
&buf)) != 0) {
ALOGW("%d----->Surface::dequeueBuffer returned error %d", mIndex, err);
return BAD_VALUE;
}
// sp<GraphicBuffer> graphicBuffer(new GraphicBuffer(buf, false));
GraphicBufferMapper &mapper = GraphicBufferMapper::get();
Rect bounds(mCropWidth, mCropHeight);
void *dst;
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
buf->handle, GRALLOC_USAGE_SW_WRITE_OFTEN, bounds, &dst));//dst就指向图形缓冲区首地址
if (true){
size_t dst_y_size = buf->stride * buf->height;
size_t dst_c_stride = ALIGN(buf->stride / 2, 16);//1行v/u的大小
size_t dst_c_size = dst_c_stride * buf->height / 2;//u/v的大小
// ALOGD(" %d: %d %d!",mIndex,buf->stride,buf->height);
// memcpy(dst, data, dst_y_size + dst_c_size*2);//将yuv数据copy到图形缓冲区
memcpy(dst, data, dst_y_size);//将yuv数据copy到图形缓冲区
for(size_t i =0;i<dst_c_size; i++) {
*((char *)dst +dst_y_size +i*2 +1) = *(((char *)data +dst_y_size +i));
*((char *)dst +dst_y_size +i*2 ) = *(((char *)data +dst_y_size +dst_c_size +i));
}
}
CHECK_EQ(0, mapper.unlock(buf->handle));
if ((err = mNativeWindow->queueBuffer(mNativeWindow.get(), buf,
-1)) != 0) {
ALOGW("Surface::queueBuffer returned error %d", err);
}
buf = NULL;
return NO_ERROR;
} |
|
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