帧元数据
使用集合让一切井井有条
根据您的偏好保存内容并对其进行分类。
帧元数据作为 BufferDesc 数据结构的成员在 Android 11 中引入。这一新字段声明为 vec<uint8_t>
以适应客户定义的数据格式,并且其对 EVS 管理器而言是不透明的。
struct BufferDesc {
/**
* HIDL counterpart of AHardwareBuffer_Desc. Please see
* hardware/interfaces/graphics/common/1.2/types.hal for more details.
*/
HardwareBuffer buffer;
...
/**
* Time that this buffer is being filled.
*/
int64_t timestamp;
/**
* Frame metadata field. This is opaque to EVS manager.
*/
vec<uint8_t> metadata;
};
HIDL vec<T>
表示大小动态变化的数组,其数据存储在单独的缓冲区中。此类实例由 struct 中的 vec<T>
实例表示,这意味着 EVS 相机 HAL 驱动程序实现拥有此元数据并应对其进行恰当的清理。填充元数据可以采用两种方式:
- 使用
operator[]
调整容器大小并填充数据
struct BufferDesc desc = {};
...
desc.metadata.resize(10);
for (auto i = 0; i < 10; ++i) {
desc.metadata[i] = frameInfo[i];
}
...
- 使用
setToExternal()
使 vec<T>
指向您的自定义数据结构。
struct BufferDesc desc = {};
struct FrameMetadata metadata = {
...
}; // this is in vendor-defined format.
desc.metadata.setToExternal(&metadata, sizeof(metadata));
...
本页面上的内容和代码示例受内容许可部分所述许可的限制。Java 和 OpenJDK 是 Oracle 和/或其关联公司的注册商标。
最后更新时间 (UTC):2024-10-06。
[{
"type": "thumb-down",
"id": "missingTheInformationINeed",
"label":"没有我需要的信息"
},{
"type": "thumb-down",
"id": "tooComplicatedTooManySteps",
"label":"太复杂/步骤太多"
},{
"type": "thumb-down",
"id": "outOfDate",
"label":"内容需要更新"
},{
"type": "thumb-down",
"id": "translationIssue",
"label":"翻译问题"
},{
"type": "thumb-down",
"id": "samplesCodeIssue",
"label":"示例/代码问题"
},{
"type": "thumb-down",
"id": "otherDown",
"label":"其他"
}]
[{
"type": "thumb-up",
"id": "easyToUnderstand",
"label":"易于理解"
},{
"type": "thumb-up",
"id": "solvedMyProblem",
"label":"解决了我的问题"
},{
"type": "thumb-up",
"id": "otherUp",
"label":"其他"
}]
{"lastModified": "\u6700\u540e\u66f4\u65b0\u65f6\u95f4 (UTC)\uff1a2024-10-06\u3002"}
[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["没有我需要的信息","missingTheInformationINeed","thumb-down"],["太复杂/步骤太多","tooComplicatedTooManySteps","thumb-down"],["内容需要更新","outOfDate","thumb-down"],["翻译问题","translationIssue","thumb-down"],["示例/代码问题","samplesCodeIssue","thumb-down"],["其他","otherDown","thumb-down"]],["最后更新时间 (UTC):2024-10-06。"]]