Calculate transformation for the TextureView. <p> An identity matrix would cause the preview to be scaled up/down to fill the TextureView. @param tex

Return capacity of string

创建编码器 @param w 要编码的视频的宽度 @param h 要编码的视频的高度 @param bitrate 要编码的码率

Create a new CameraInstance. <p> Override to use a custom CameraInstance. @return a new CameraInstance

Create a new Decoder. While this method will only be called from a single thread, the created Decoder will be used from a different thread. Each deco

Create an scan intent with the specified options. @return the intent

Create an scan intent with the specified options. @return the intent

Decode a single barcode, then stop decoding. The callback will only be called on the UI thread. @param callback called with the barcode result, as w

Call from camera thread

编码 @param yv12 yv12格式的视频数据（数据长度应该为w h 1.5） @param offset 视频数据的偏移（即在yv12里的起始位） @param out 编码后的数据。 @param outOffset 编码后的视频数据的偏移（即在out里的起始

Save the barcode image to a temporary file stored in the application's cache, and return its path. Only does so if returnBarcodeImagePath is enabled.

Sort previews based on their suitability. In most cases, {@link #getBestPreviewSize(List, Size)} should be used instead. The sizes list may be reord

Choose the best preview size, based on our display size. We prefer: 1. no scaling 2. least downscaling 3. least upscaling We do not care much about

Return the source bitmap (cropped; in display orientation). @return the bitmap

@return {@link Bitmap} with barcode preview @see #getBitmapWithResultPoints(int)

@return the camera rotation relative to display rotation, in degrees. Typically 0 if the display is in landscape orientation.

@param rotate true to rotate the preview size @return desired preview size in natural camera orientation.

从文件获取时长

The framing rectangle, relative to this view. Use to draw the rectangle. <p> Will never be null while the preview is active. @return the framing rect

获取 MP4 时长（毫秒） 统一返回默认 60 秒

获取MP4时长（秒），带缓存

根据params参数生成文件列表 这里可以根据params中的时间范围、通道等信息动态生成 {startTime:"2025-12-10T00:00:00",endTime:"2025-12-10T23:59:59",cIndex:"0"}

Call immediately after decode(), from the same thread. <p> The result is undefined while decode() is running. @return possible ResultPoints from the

The framing rect, relative to the camera preview resolution. <p> Will never be null while the preview is active. @return the preview rect, or null @s

Override this to specify a different preview scaling strategy.

Actual preview size in current rotation. null if not determined yet. @return preview size

@return raw bytes encoded by the barcode, if applicable, otherwise {@code null} @see Result#getRawBytes()

@return {@link Map} mapping {@link ResultMetadataType} keys to values. May be {@code null}. This contains optional metadata about what was detected ab