Class vart::PreProcess#

class PreProcess

The preprocessing module handles data preparation tasks such as normalization, scaling, and video format conversion.

This module supports software based pre-processing as well as hardware accelerated pre-processing for optimized performance. It ensures that input data is appropriately formatted for inference. Application can also incorporate custom pre processing by overriding base class methods.

Public Functions

PreProcess() = delete#
PreProcess(PreProcessImplType type, std::string &json_data, std::shared_ptr<Device> device)#

PreProcess() - Constructor with implementation type and json data.

Parameters:

  • type – PreProcessImplType based on which implementaion need to be used.

  • json_data – Additional preprocessing/user related information in JSON Format which can be used by implementations.

  • device – Device handle to be used by implementations.

PreProcess(std::shared_ptr<PreProcessImplBase> ptr)#

PreProcess() - Constructor for using user defined implementation.

Parameters:

ptr – Pointer to user’s implementation instance

~PreProcess() = default#
void process(std::vector<PreProcessOp> &preprocess_ops)#

process() - Perform pre-processing based on the specified parameters.

Parameters:

preprocess_ops – Vector of PreProcessOp to be performed. PreProcessOp contains input/output frame and their corresponding ROI.

void get_input_vinfo(int32_t height, int32_t width, VideoFormat fmt, VideoInfo &vinfo)#

get_input_vinfo() - Fills the input video info from input params.

Parameters:

  • height – Height of the input frame.

  • width – Width of the input frame.

  • fmt – Video format of the input frame.

  • vinfo – VideoInfo which can be filled by API. Filled VideoInfo can be used to construct input videoframe. User must provide valid pointer.

const VideoInfo &get_output_vinfo()#

get_output_vinfo() - Get the output video info.

Returns:

Returns VideoInfo which can be used to construct output video frame.

void set_preprocess_info(PreProcessInfo &preprocess_info)#

set_preprocess_info() - Set the required Preprocess parameters.

Parameters:

preprocess_info – Struture with pre processing parameters.

const PreProcessInfo &get_preprocess_info()#

get_preprocess_info() - Get the preprocess info

Returns:

Returns struture of pre processing parameters.

const std::shared_ptr<PreProcessImplBase> &get_pimpl_handle() const#

get_pimpl_handle() - Gives pointer to implementation class.

Returns:

Returns a constant reference of pointer to implementation class.

Private Members

std::shared_ptr<PreProcessImplBase> pimpl#