最简单的BufferQueue测试程序（一）

概要

本示例代码使用BufferQueue最基本的操作接口，演示了BufferQueue操作的基本流程。

Android版本：8.1

伪代码

void main(void){createBufferQueue();consumerConnect()connect();dequeueBuffer();requestBuffer();queueBuffer();acquireBuffer();releaseBuffer();}

详细参考代码

mytest.cpp:

#define LOG_TAG "MyTest"#include #include #include #include #include using namespace android;struct DummyConsumer : public BnConsumerListener {    void onFrameAvailable(const BufferItem& /* item */) override {}    void onBuffersReleased() override {}    void onSidebandStreamChanged() override {}};int main(int argc, char** argv){    sp<IGraphicBufferProducer> producer;    sp<IGraphicBufferConsumer> consumer;    BufferQueue::createBufferQueue(&producer, &consumer);    consumer->consumerConnect(new DummyConsumer, false);    IGraphicBufferProducer::QueueBufferOutput output;    producer->connect(new DummyProducerListener, NATIVE_WINDOW_API_CPU, false, &output);    /****************** Producer ***********************/    int slot;    sp<Fence> fence;    sp<GraphicBuffer> buffer;    producer->dequeueBuffer(&slot, &fence, 0, 0, 0,         GRALLOC_USAGE_SW_WRITE_OFTEN, nullptr, nullptr);    producer->requestBuffer(slot, &buffer);    uint32_t* dataIn;    buffer->lock(GraphicBuffer::USAGE_SW_WRITE_OFTEN, reinterpret_cast<void**>(&dataIn));    *dataIn = 0x12345678u;    buffer->unlock();    IGraphicBufferProducer::QueueBufferInput input(0, false, HAL_DATASPACE_UNKNOWN, Rect(1, 1),    NATIVE_WINDOW_SCALING_MODE_FREEZE, 0, Fence::NO_FENCE);    producer->queueBuffer(slot, input, &output);    /****************** Consumer ***********************/    BufferItem item;    consumer->acquireBuffer(&item, static_cast<nsecs_t>(0));    uint32_t* dataOut;    item.mGraphicBuffer->lock(GraphicBuffer::USAGE_SW_READ_OFTEN,          reinterpret_cast<void**>(&dataOut));    printf("data out is 0x%08x\n", *dataOut);    item.mGraphicBuffer->unlock();    consumer->releaseBuffer(item.mSlot, item.mFrameNumber, EGL_NO_DISPLAY,         EGL_NO_SYNC_KHR, Fence::NO_FENCE);    return 0;}

Android.bp:

cc_test {    name: "mytest",    srcs: ["mytest.cpp"],    clang: true,    shared_libs: [        "liblog",        "libbinder",        "libgui",        "libui",        "libutils",    ],}

描述

从BufferQueue中申请一块1x1大小的buffer；

向该buffer中写入0x12345678，然后放入BufferQueue队列中；

从队列中取出该buffer，并读取该buffer的内容；

释放该buffer。

运行结果

$ adb shell /data/mytestdata out is 0x12345678

示例下载

GitHub: mytest

参考资料

Android BufferQueue自测试程序：BufferQueue_test.cpp —— MoveFromConsumerToProducer

概要

伪代码

详细参考代码

描述

运行结果

示例下载

参考资料

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