Android NativeWindow render 打印输出

1.获取graphicBuffer中的内存；

struct AwesomeNativeWindowRenderer : public AwesomeRenderer {
    AwesomeNativeWindowRenderer(
            const sp<ANativeWindow> &nativeWindow,
            int32_t rotationDegrees,int32_t width,int32_t height,int32_t is_hevc)
        : mNativeWindow(nativeWindow),
        power_fd(-1),
        mWidth(width),
        mHeight(height),
        mIshevc(is_hevc){
        applyRotation(rotationDegrees);
        openVideoPowerControl();
    }


    virtual void render(MediaBuffer *buffer) {
        ATRACE_CALL();
        int64_t timeUs;
        CHECK(buffer->meta_data()->findInt64(kKeyTime, &timeUs));
        native_window_set_buffers_timestamp(mNativeWindow.get(), timeUs * 1000);
        status_t err = mNativeWindow->queueBuffer(
                mNativeWindow.get(), buffer->graphicBuffer().get(), -1);
        if (err != 0) {
            ALOGE("queueBuffer failed with error %s (%d)", strerror(-err),
                    -err);
            return;
        }
//      ALOGW("render hex: %d",buffer->range_length());
                sp<GraphicBuffer> gb =  buffer->graphicBuffer().get();
                char *buff ;
                gb->lock(GRALLOC_USAGE_SW_READ_OFTEN | GRALLOC_USAGE_SW_WRITE_OFTEN,(void **)&buff);
                //ALOGE("buff %p",buff);
                //hexdump(buff,180);


                gb->unlock();


//      hexdump((const uint8_t *)buffer->data(),buffer->size());
        sp<MetaData> metaData = buffer->meta_data();
        metaData->setInt32(kKeyRendered, 1);
    }           

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