holoscan::data_loggers::SimpleTextSerializer

#include <holoscan/data_loggers/simple_text_serializer.hpp>

Inherits from: holoscan::Resource (public)

Constructors

SimpleTextSerializer

holoscan::data_loggers::SimpleTextSerializer::SimpleTextSerializer() = defaultholoscan::data_loggers::SimpleTextSerializer::SimpleTextSerializer() = default

Destructor

~SimpleTextSerializer

holoscan::data_loggers::SimpleTextSerializer::~SimpleTextSerializer() override = defaultholoscan::data_loggers::SimpleTextSerializer::~SimpleTextSerializer() override = default

Methods

setup

void holoscan::data_loggers::SimpleTextSerializer::setup(
    ComponentSpec &spec
) override

Define the resource specification.

Parameters

spec

ComponentSpec &

The reference to the component specification.

can_handle_message

bool holoscan::data_loggers::SimpleTextSerializer::can_handle_message(
    const std::type_info &message_type
) const

serialize_to_string

std::string holoscan::data_loggers::SimpleTextSerializer::serialize_to_string(
    std::any data
)

Serialize data to a simple text string.

serialize_tensor_to_string

std::string holoscan::data_loggers::SimpleTextSerializer::serialize_tensor_to_string(
    const std::shared_ptr<Tensor> &tensor,
    bool log_data_content = false,
    std::optional<cudaStream_t> stream = std::nullopt
)

Serialize tensor data to a simple text string.

serialize_tensormap_to_string

std::string holoscan::data_loggers::SimpleTextSerializer::serialize_tensormap_to_string(
    const TensorMap &tensor_map,
    bool log_data_content = false,
    std::optional<cudaStream_t> stream = std::nullopt
)

Serialize tensor map data to a simple text string.

serialize_metadata_to_string

std::string holoscan::data_loggers::SimpleTextSerializer::serialize_metadata_to_string(
    const std::shared_ptr<MetadataDictionary> &metadata
)

Serialize metadata to a simple text string.

serialize_video_buffer_to_string

std::string holoscan::data_loggers::SimpleTextSerializer::serialize_video_buffer_to_string(
    const nvidia::gxf::Handle<nvidia::gxf::VideoBuffer> &video_buffer,
    std::optional<cudaStream_t> stream = std::nullopt
)

Serialize video buffer data to a simple text string.

register_encoder

template <typename T>
void holoscan::data_loggers::SimpleTextSerializer::register_encoder(
    std::function<std::string(const std::any &)> encoder
)

Template parameters

typename

The type to register an encoder for

Parameters

encoder

std::function<std::string(const std::any &)>

Function that takes const std::any& and returns std::string

resource_type

ResourceType holoscan::data_loggers::SimpleTextSerializer::resource_type() constResourceType holoscan::data_loggers::SimpleTextSerializer::resource_type() const

Get the resource type.

Returns: The resource type.

name

Set the name of the resource (1)

Set the name of the resource (2)

Const

Resource & holoscan::data_loggers::SimpleTextSerializer::name(Resource & holoscan::data_loggers::SimpleTextSerializer::name(
    const std::string &name
) &

Set the name of the resource.

Returns: The reference to the resource.

Parameters

name

const std::string &

The name of the resource.

fragment

Set the fragment of the resource

Overload 2

Const

Resource & holoscan::data_loggers::SimpleTextSerializer::fragment(Resource & holoscan::data_loggers::SimpleTextSerializer::fragment(
    Fragment *fragment
)

Set the fragment of the resource.

Returns: The reference to the resource.

Parameters

fragment

Fragment *

The pointer to the fragment of the resource.

spec

Set the component specification to the resource

Get the component specification of the resource

Resource & holoscan::data_loggers::SimpleTextSerializer::spec(Resource & holoscan::data_loggers::SimpleTextSerializer::spec(
    const std::shared_ptr<ComponentSpec> &spec
)

Set the component specification to the resource.

Returns: The reference to the resource.

Parameters

spec

const std::shared_ptr<ComponentSpec> &

The component specification.

spec_shared

std::shared_ptr<ComponentSpec> holoscan::data_loggers::SimpleTextSerializer::spec_shared()std::shared_ptr<ComponentSpec> holoscan::data_loggers::SimpleTextSerializer::spec_shared()

Get the shared pointer to the component spec.

Returns: The shared pointer to the component spec.

initialize

void holoscan::data_loggers::SimpleTextSerializer::initialize() override

Initialize the component.

This method is called only once when the component is created for the first time, and use of light-weight initialization.

to_yaml_node

YAML::Node holoscan::data_loggers::SimpleTextSerializer::to_yaml_node() const override

Get a YAML representation of the resource.

Returns: YAML node including spec of the resource in addition to the base component properties.

set_parameters

void holoscan::data_loggers::SimpleTextSerializer::set_parameters() override

Set the parameters based on defaults (sets GXF parameters for GXF components).

id

int64_t holoscan::ComponentBase::id() const

Get the identifier of the component.

By default, the identifier is set to -1. It is set to a valid value when the component is initialized.

With the default executor (GXFExecutor), the identifier is set to the GXF component ID.

Returns: The identifier of the component.

add_arg

Add an argument to the component (1)

Add an argument to the component (2)

Add a list of arguments to the component (1)

Add a list of arguments to the component (2)

void holoscan::ComponentBase::add_arg(
    const Arg &arg
)

Add an argument to the component.

Parameters

arg

const Arg &

The argument to add.

args

std::vector<Arg> & holoscan::ComponentBase::args()

Get the list of arguments.

Returns: The vector of arguments.

description

std::string holoscan::ComponentBase::description() const

Get a description of the component.

Returns: YAML string.

See also: to_yaml_node()

service

template <typename ServiceT = DefaultFragmentService>
std::shared_ptr<ServiceT> holoscan::ComponentBase::service(
    std::string_view id = ""
) const

Retrieve a registered fragment service or resource.

Retrieves a previously registered fragment service or resource by its type and optional identifier. Returns nullptr if no service/resource is found with the specified type and identifier.

Note that any changes to the service retrieval logic in this method should be synchronized with the implementation in Fragment::service() method to maintain consistency.

Returns: The shared pointer to the service/resource, or nullptr if not found or if type casting fails.

Template parameters

ServiceT

typename

The type of the service/resource to retrieve. Must inherit from either Resource or FragmentService. Defaults to DefaultFragmentService if not specified.

Parameters

std::string_viewDefaults to ""

The identifier of the service/resource. If empty, retrieves by type only.

get_service_by_type_info

std::shared_ptr<FragmentService> holoscan::ComponentBase::get_service_by_type_info(
    const std::type_info &service_type,
    std::string_view id = ""
) const

Retrieve a registered fragment service or resource for Python bindings.

This is a helper method for Python bindings to retrieve a service by its C++ type info.

Returns: The shared pointer to the base service, or nullptr if not found.

Parameters

service_type

const std::type_info &

The type info of the service/resource to retrieve.

std::string_viewDefaults to ""

The identifier of the service/resource. If empty, retrieves by type only.

reset_backend_objects

virtual void holoscan::ComponentBase::reset_backend_objects()

Reset any backend-specific objects (e.g. GXF GraphEntity).

initialize_default_encoders

void holoscan::data_loggers::SimpleTextSerializer::initialize_default_encoders()

format_vector

template <typename T>
std::string holoscan::data_loggers::SimpleTextSerializer::format_vector(
    const std::vector<T> &vec
) const

format_metadata_dict

std::string holoscan::data_loggers::SimpleTextSerializer::format_metadata_dict(
    const MetadataDictionary &dict
) const

to_string

std::string holoscan::data_loggers::SimpleTextSerializer::to_string(
    const std::any &data
) const

get_video_format_info

VideoFormatInfo holoscan::data_loggers::SimpleTextSerializer::get_video_format_info(
    nvidia::gxf::VideoFormat format
) const

Detect video format information from GXF VideoFormat.

Returns: VideoFormatInfo containing channels, element type, and support status

Parameters

format

nvidia::gxf::VideoFormat

The GXF video format to analyze

serialize_pixel_data

std::string holoscan::data_loggers::SimpleTextSerializer::serialize_pixel_data(
    const void *data_ptr,
    VideoElementType element_type,
    int channels,
    size_t pixels_to_show,
    size_t total_pixels
) const

Serialize pixel data to string representation.

Returns: String representation of the pixel data

Parameters

data_ptr

const void *

Pointer to the pixel data

element_type

VideoElementType

Type of elements in the data

channels

int

Number of channels per pixel

pixels_to_show

size_t

Number of pixels to serialize

total_pixels

size_t

Total number of pixels (for truncation message)

update_params_from_args

Update parameters based on the specified arguments

Update parameters based on the specified arguments (with params)

void holoscan::data_loggers::SimpleTextSerializer::update_params_from_args()

Update parameters based on the specified arguments.

service_provider

void holoscan::ComponentBase::service_provider(
    FragmentServiceProvider *provider
)

Set the service provider that owns this component.

Static methods

register_converter

template <typename typeT>
static void holoscan::ComponentBase::register_converter()

If an operator or resource has an argument with a custom type, the argument setter must be registered using this method.

The argument setter is used to set the value of the argument from the YAML configuration.

This method can be called in the initialization phase of the operator/resource (e.g., initialize()). The example below shows how to register the argument setter for the custom type (Vec3):

It is assumed that YAML::convert<T>::encode and YAML::convert<T>::decode are implemented for the given type. You need to specialize the YAML::convert<> template class.

For example, suppose that you had a Vec3 class with the following members:

You can define the YAML::convert<Vec3> as follows in a ‘.cpp’ file:

Please refer to the yaml-cpp documentation for more details.

Template parameters

typeT

typename

The type of the argument to register.

Example

void MyOp::initialize() {
  register_converter<Vec3>();
}

Example

struct Vec3 {
  // make sure you have overloaded operator==() for the comparison
  double x, y, z;
};

Example

namespace YAML {
template<>
struct convert<Vec3> {
  static Node encode(const Vec3& rhs) {
    Node node;
    node.push_back(rhs.x);
    node.push_back(rhs.y);
    node.push_back(rhs.z);
    return node;
  }
  static bool decode(const Node& node, Vec3& rhs) {
    if(!node.IsSequence() || node.size() != 3) {
      return false;
    }
    rhs.x = node[0].as<double>();
    rhs.y = node[1].as<double>();
    rhs.z = node[2].as<double>();
    return true;
  }
};
}

register_argument_setter

template <typename typeT>
void holoscan::ComponentBase::register_argument_setter()

Please refer to the documentation of register_converter() for more details.

Template parameters

typeT

typename

The type of the argument to register.

Types

VideoElementType

Name	Value	Description
`kUINT8`
`kUINT16`
`kUINT32`
`kFLOAT32`
`kFLOAT64`

ResourceType

Resource type used for the initialization of the resource.

Name	Value	Description
`kNative`		Native resource.
`kGXF`		GXF resource.

Member variables

Name	Type	Description
`max_elements_`	`Parameter< int64_t >`
`max_metadata_items_`	`Parameter< int64_t >`
`log_video_buffer_content_`	`Parameter< bool >`
`encoders_`	`std::unordered_map< std::type_index, std::function< std::string(const std::any &)> >`
`resource_type_`	`ResourceType`	The type of the resource.
`is_initialized_`	`bool`	Whether the resource is initialized.
`spec_`	`std::shared_ptr< ComponentSpec >`	The component specification.
`id_`	`int64_t`	The ID of the component.
`name_`	`std::string`	Name of the component.
`fragment_`	`Fragment *`	Pointer to the fragment that owns this component.
`args_`	`std::vector< Arg >`	List of arguments.
`service_provider_`	`FragmentServiceProvider *`	Pointer to the service provider.

Inner classes

VideoFormatInfo

struct holoscan::data_loggers::SimpleTextSerializer::VideoFormatInfo

Name	Type	Description
`channels`	`int`
`element_type`	`VideoElementType`
`supported`	`bool`