长沙做网站一般多少钱,网络营销推广与策划,谷歌搜索引擎入口2022,网页设计站点规划目前Camera API 1使用的比较少了#xff0c;一般代码如下。遇到的问题是camera1接口无法打开相机#xff0c;cam2接口打开正常。最后排查结果是 sensor的 frameRate 配置不对。 Camera camera;CameraPreview mPreview;SuppressLint(MissingPermission)Overridepr… 目前Camera API 1使用的比较少了一般代码如下。遇到的问题是camera1接口无法打开相机cam2接口打开正常。最后排查结果是 sensor的 frameRate 配置不对。 Camera camera;CameraPreview mPreview;SuppressLint(MissingPermission)Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.cam_1_layout);mPreview findViewById(R.id.camera_1_preview);try {camera Camera.open(0);mPreview.setCamera(camera);} catch (Exception e) {e.printStackTrace();}}public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {private Camera mCamera;public CameraPreview(Context context, AttributeSet attrs) {super(context, attrs);}public CameraPreview(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}public CameraPreview(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {super(context, attrs, defStyleAttr, defStyleRes);}public void setCamera(Camera camera) {mCamera camera;}Overridepublic void surfaceCreated(SurfaceHolder holder) {try {mCamera.setPreviewDisplay(holder);mCamera.startPreview();} catch (IOException e) {e.printStackTrace();}}Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {// 相机预览尺寸变化时调整相机参数if (mCamera ! null) {Camera.Parameters parameters mCamera.getParameters();parameters.setPreviewSize(width, height);mCamera.setParameters(parameters);}}Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// 停止相机预览并释放资源if (mCamera ! null) {mCamera.stopPreview();mCamera.release();mCamera null;}} log显示是 Camera.open(0); 时异常预览分辨率不对导致。跟踪代码Cam初始化时
CameraService::connectHelper 函数中执行 client-initializeclient 对应到不同api创建不同的对象。api1下的Camera2Client::initialize 流程中有 mParameters.initialize 步骤在 Parameters::initialize 中执行 getFilteredSizes 进行过滤操作 //过滤预览sizeres getFilteredSizes(maxPreviewSize, availablePreviewSizes);if (res ! OK) return res;res getFilteredSizes(videoSizeUpperBound, availableVideoSizes);if (res ! OK) return res;status_t Parameters::getFilteredSizes(Size limit, VectorSize *sizes) {if (info NULL) {ALOGE(%s: Static metadata is not initialized, __FUNCTION__);return NO_INIT;}if (sizes NULL) {ALOGE(%s: Input size is null, __FUNCTION__);return BAD_VALUE;}sizes-clear();VectorStreamConfiguration scs getStreamConfigurations();for (size_t i0; i scs.size(); i) {const StreamConfiguration sc scs[i];if (sc.isInput ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS_OUTPUT sc.format HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED sc.width limit.width sc.height limit.height) {int64_t minFrameDuration getMinFrameDurationNs({sc.width, sc.height}, HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED);if (minFrameDuration MAX_PREVIEW_RECORD_DURATION_NS) {// Filter slow sizes from preview/recordcontinue;}sizes-push({sc.width, sc.height});}}if (sizes-isEmpty()) {ALOGE(generated preview size list is empty!!);return BAD_VALUE;}return OK;
}
这里获取 sensor 配置支持的 ANDROID_SCALER_AVAILABLE_MIN_FRAME_DURATIONS 数值与平台默认 MAX_PREVIEW_RECORD_DURATION_NS 值比较。这里比较是每一帧的时间单位是ns值越大说明帧率越低。MAX_PREVIEW_RECORD_DURATION_NS 由系统默认设置一般平台帧率30MAX_PREVIEW_RECORD_DURATION_NS 1/30 * 1000 000 000 (ns)。sensor 配置帧率一般在 sensor.xml 中标签是 frameRate 根据不同SIZE会配置不同frameRate的值。
