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rs_frame.hpp
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rs_frame.hpp
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// License: Apache 2.0. See LICENSE file in root directory.
// Copyright(c) 2017 Intel Corporation. All Rights Reserved.
#ifndef LIBREALSENSE_RS2_FRAME_HPP
#define LIBREALSENSE_RS2_FRAME_HPP
#include "rs_types.hpp"
namespace rs2
{
class frame_source;
class frame_queue;
class syncer;
class processing_block;
class pointcloud;
class sensor;
class frame;
class pipeline_profile;
class points;
class video_stream_profile;
class stream_profile
{
public:
/**
* Class to store the profile of stream
*/
stream_profile() : _profile(nullptr) {}
/**
* Return the specific stream index
* \return int - stream index
*/
int stream_index() const { return _index; }
/**
* Return the stream type
* \return rs2_stream - stream type
*/
rs2_stream stream_type() const { return _type; }
/**
* Return the stream format
* \return rs2_format - stream format
*/
rs2_format format() const { return _format; }
/**
* Return the stream frame per second
* \return int - frame rate
*/
int fps() const { return _framerate; }
/**
* Return the assigned unique index when the stream was created
* \return int - unique id
*/
int unique_id() const { return _uid; }
/**
* Clone the current profile and change the type, index and format to input parameters
* \param[in] type - will change the stream type from the cloned profile.
* \param[in] index - will change the stream index from the cloned profile.
* \param[in] format - will change the stream format from the cloned profile.
* \return stream_profile - return the cloned stream profile.
*/
stream_profile clone(rs2_stream type, int index, rs2_format format) const
{
rs2_error* e = nullptr;
auto ref = rs2_clone_stream_profile(_profile, type, index, format, &e);
error::handle(e);
stream_profile res(ref);
res._clone = std::shared_ptr<rs2_stream_profile>(ref, [](rs2_stream_profile* r) { rs2_delete_stream_profile(r); });
return res;
}
/**
* Comparison operator, compare if two stream profiles are the same
* \param[in] rhs - stream profile to compare with.
* \return bool - true or false.
*/
bool operator==(const stream_profile& rhs)
{
return stream_index() == rhs.stream_index() &&
stream_type() == rhs.stream_type() &&
format() == rhs.format() &&
fps() == rhs.fps();
}
/**
* Template function, checking if the instance belongs to specific class type
* \return bool - true or false.
*/
template<class T>
bool is() const
{
T extension(*this);
return extension;
}
/**
* Template function, casting the instance as another class type
* \return class instance - pointer or null.
*/
template<class T>
T as() const
{
T extension(*this);
return extension;
}
/**
* Return the string of stream name
* \return string - stream name.
*/
std::string stream_name() const
{
std::stringstream ss;
ss << rs2_stream_to_string(stream_type());
if (stream_index() != 0) ss << " " << stream_index();
return ss.str();
}
/**
* Checks if stream profile is marked/assigned as default, meaning that the profile will be selected when the user requests stream configuration using wildcards (RS2_DEPTH, -1,-1,...
* \return bool - true or false.
*/
bool is_default() const { return _default; }
/**
* Checks if the profile is valid
* \return bool - true or false.
*/
operator bool() const { return _profile != nullptr; }
/**
* Get back the internal stream profile instance
* \return rs2_stream_profile* - internal implementation of the profile class
*/
const rs2_stream_profile* get() const { return _profile; }
/**
Operator implement, return the internal stream profile instance.
* \return rs2_stream_profile* - internal instance to communicate with real implementation.
*/
/**
* Get the extrinsic transformation between two profiles (representing physical sensors)
* \param[in] stream_profile to - the stream profile (another sensor) to be based to return the extrinsic
* \return rs2_stream_profile* - internal instance to communicate with real implementation.
*/
rs2_extrinsics get_extrinsics_to(const stream_profile& to) const
{
rs2_error* e = nullptr;
rs2_extrinsics res;
rs2_get_extrinsics(get(), to.get(), &res, &e);
error::handle(e);
return res;
}
/**
* Assign extrinsic transformation parameters to a specific profile (sensor). The extrinsic information is generally available as part of the camera calibration, and librealsense is responsible for retrieving and assigning these parameters where appropriate.
* This specific function is intended for synthetic/mock-up (software) devices for which the parameters are produced and injected by the user.
* \param[in] stream_profile to - which stream profile to be registered with the extrinsic.
* \param[in] rs2_extrinsics extrinsics - the extrinsics to be registered.
*/
void register_extrinsics_to(const stream_profile& to, rs2_extrinsics extrinsics)
{
rs2_error* e = nullptr;
rs2_register_extrinsics(get(), to.get(), extrinsics, &e);
error::handle(e);
}
bool is_cloned() { return bool(_clone); }
explicit stream_profile(const rs2_stream_profile* profile) : _profile(profile)
{
rs2_error* e = nullptr;
rs2_get_stream_profile_data(_profile, &_type, &_format, &_index, &_uid, &_framerate, &e);
error::handle(e);
_default = !!(rs2_is_stream_profile_default(_profile, &e));
error::handle(e);
}
operator const rs2_stream_profile*() { return _profile; }
explicit operator std::shared_ptr<rs2_stream_profile>() { return _clone; }
protected:
friend class rs2::sensor;
friend class rs2::frame;
friend class rs2::pipeline_profile;
friend class rs2::video_stream_profile;
const rs2_stream_profile* _profile;
std::shared_ptr<rs2_stream_profile> _clone;
int _index = 0;
int _uid = 0;
int _framerate = 0;
rs2_format _format = RS2_FORMAT_ANY;
rs2_stream _type = RS2_STREAM_ANY;
bool _default = false;
};
class video_stream_profile : public stream_profile
{
public:
/**
* Stream profile instance which contains additional video attributes
* \param[in] stream_profile sp - assign exisiting stream_profile to this instance.
*/
explicit video_stream_profile(const stream_profile& sp)
: stream_profile(sp)
{
rs2_error* e = nullptr;
if ((rs2_stream_profile_is(sp.get(), RS2_EXTENSION_VIDEO_PROFILE, &e) == 0 && !e))
{
_profile = nullptr;
}
error::handle(e);
if (_profile)
{
rs2_get_video_stream_resolution(_profile, &_width, &_height, &e);
error::handle(e);
}
}
int width() const
{
return _width;
}
int height() const
{
return _height;
}
/**
* Get stream profile instrinsics attributes
* \return rs2_intrinsics - stream intrinsics.
*/
rs2_intrinsics get_intrinsics() const
{
rs2_error* e = nullptr;
rs2_intrinsics intr;
rs2_get_video_stream_intrinsics(_profile, &intr, &e);
error::handle(e);
return intr;
}
bool operator==(const video_stream_profile& other) const
{
return (((stream_profile&)*this)==other &&
width() == other.width() &&
height() == other.height());
}
using stream_profile::clone;
/**
* Clone current profile and change the type, index and format to input parameters
* \param[in] type - will change the stream type from the cloned profile.
* \param[in] index - will change the stream index from the cloned profile.
* \param[in] format - will change the stream format from the cloned profile.
* \param[in] width - will change the width of the profile
* \param[in] height - will change the height of the profile
* \param[in] intr - will change the intrinsics of the profile
* \return stream_profile - return the cloned stream profile.
*/
stream_profile clone(rs2_stream type, int index, rs2_format format, int width, int height, const rs2_intrinsics& intr) const
{
rs2_error* e = nullptr;
auto ref = rs2_clone_video_stream_profile(_profile, type, index, format, width, height, &intr, &e);
error::handle(e);
stream_profile res(ref);
res._clone = std::shared_ptr<rs2_stream_profile>(ref, [](rs2_stream_profile* r) { rs2_delete_stream_profile(r); });
return res;
}
private:
int _width = 0;
int _height = 0;
};
class motion_stream_profile : public stream_profile
{
public:
/**
* Stream profile instance which contains IMU-specific intrinsics.
* \param[in] stream_profile sp - assign exisiting stream_profile to this instance.
*/
explicit motion_stream_profile(const stream_profile& sp)
: stream_profile(sp)
{
rs2_error* e = nullptr;
if ((rs2_stream_profile_is(sp.get(), RS2_EXTENSION_MOTION_PROFILE, &e) == 0 && !e))
{
_profile = nullptr;
}
error::handle(e);
}
/**
* Returns scale/bias/covariances of a the motion sensors
* \return rs2_motion_device_intrtinsic - stream motion intrinsics
*/
rs2_motion_device_intrinsic get_motion_intrinsics() const
{
rs2_error* e = nullptr;
rs2_motion_device_intrinsic intrin;
rs2_get_motion_intrinsics(_profile, &intrin, &e);
error::handle(e);
return intrin;
}
};
class pose_stream_profile : public stream_profile
{
public:
/**
* Stream profile instance with an explicit pose extension type.
* \param[in] stream_profile sp - assign exisiting stream_profile to this instance.
*/
explicit pose_stream_profile(const stream_profile& sp)
: stream_profile(sp)
{
rs2_error* e = nullptr;
if ((rs2_stream_profile_is(sp.get(), RS2_EXTENSION_POSE_PROFILE, &e) == 0 && !e))
{
_profile = nullptr;
}
error::handle(e);
}
};
/**
Interface for frame filtering functionality
*/
class filter_interface
{
public:
virtual rs2::frame process(rs2::frame frame) const = 0;
virtual ~filter_interface() = default;
};
class frame
{
public:
/**
* Base class for multiple frame extensions
*/
frame() : frame_ref(nullptr) {}
/**
* Base class for multiple frame extensions with internal frame handle
* \param[in] rs2_frame frame_ref - internal frame instance
*/
frame(rs2_frame* ref) : frame_ref(ref)
{
#ifdef _DEBUG
if (ref)
{
rs2_error* e = nullptr;
auto r = rs2_get_frame_number(ref, &e);
if (!e)
frame_number = r;
auto s = rs2_get_frame_stream_profile(ref, &e);
if (!e)
profile = stream_profile(s);
}
else
{
frame_number = 0;
profile = stream_profile();
}
#endif
}
/**
* Change the internal frame handle to the one in parameter, then put the other frame internal frame handle to nullptr
* \param[in] frame other - another frame instance to be pointed to
*/
frame(frame&& other) noexcept : frame_ref(other.frame_ref)
{
other.frame_ref = nullptr;
#ifdef _DEBUG
frame_number = other.frame_number;
profile = other.profile;
#endif
}
/**
* Change the internal frame handle to the one in parameter, the function exchange the internal frame handle.
* \param[in] frame other - another frame instance to be pointed to
*/
frame& operator=(frame other)
{
swap(other);
return *this;
}
/**
* Set the internal frame handle to the one in parameter, the function create additional reference if internal reference exist.
* \param[in] frame other - another frame instance to be pointed to
*/
frame(const frame& other)
: frame_ref(other.frame_ref)
{
if (frame_ref) add_ref();
#ifdef _DEBUG
frame_number = other.frame_number;
profile = other.profile;
#endif
}
/**
* Swap the internal frame handle with the one in parameter
* \param[in] frame other - another frame instance to be swaped
*/
void swap(frame& other)
{
std::swap(frame_ref, other.frame_ref);
#ifdef _DEBUG
std::swap(frame_number, other.frame_number);
std::swap(profile, other.profile);
#endif
}
/**
* releases the frame handle
*/
~frame()
{
if (frame_ref)
{
rs2_release_frame(frame_ref);
}
}
/**
* keep the frame, otherwise if no refernce to the frame, the frame will be released.
*/
void keep() { rs2_keep_frame(frame_ref); }
/**
* Parenthesis operator check if internal frame handle is valid.
* \return bool - true or false.
*/
operator bool() const { return frame_ref != nullptr; }
rs2_sensor* get_sensor()
{
rs2_error* e = nullptr;
auto r = rs2_get_frame_sensor(frame_ref, &e);
error::handle(e);
return r;
}
/**
* retrieve the time at which the frame was captured
* During the frame's lifetime it receives timestamps both at the device and host levels.
* The different timestamps are gathered and managed under the frame's Metadata attributes.
* Chronologically the list of timestamps comprises of:
* SENSOR_TIMESTAMP - Device clock. For video sensors designates the middle of exposure. Requires metadata support.
* FRAME_TIMESTAMP - Device clock. Stamped at the beginning of frame readout and transfer. Requires metadata support.
* BACKEND_TIMESTAMP - Host (EPOCH) clock in Kernel space. Frame transfer from USB Controller to the USB Driver.
* TIME_OF_ARRIVAL - Host (EPOCH) clock in User space. Frame transfer from the USB Driver to Librealsense.
*
* During runtime the SDK dynamically selects the most correct representaion, based on both device and host capabilities:
* In case the frame metadata is not configured:
* - The function call provides the TIME_OF_ARRIVAL stamp.
* In case the metadata is available the function returns:
* - `HW Timestamp` (FRAME_TIMESTAMP), or
* - `Global Timestamp` Host-corrected derivative of `HW Timestamp` required for multi-sensor/device synchronization
* - The user can select between the unmodified and the host-calculated Hardware Timestamp by toggling
* the `RS2_OPTION_GLOBAL_TIME_ENABLED` option.
* To query which of the three alternatives is active use `get_frame_timestamp_domain()` function call
* \return the timestamp of the frame, in milliseconds according to the elaborated flow
*/
double get_timestamp() const
{
rs2_error* e = nullptr;
auto r = rs2_get_frame_timestamp(frame_ref, &e);
error::handle(e);
return r;
}
/** retrieve the timestamp domain
* \return timestamp domain (clock name) for timestamp values
*/
rs2_timestamp_domain get_frame_timestamp_domain() const
{
rs2_error* e = nullptr;
auto r = rs2_get_frame_timestamp_domain(frame_ref, &e);
error::handle(e);
return r;
}
/** retrieve the current value of a single frame_metadata
* \param[in] frame_metadata the frame_metadata whose value should be retrieved
* \return the value of the frame_metadata
*/
rs2_metadata_type get_frame_metadata(rs2_frame_metadata_value frame_metadata) const
{
rs2_error* e = nullptr;
auto r = rs2_get_frame_metadata(frame_ref, frame_metadata, &e);
error::handle(e);
return r;
}
/** determine if the device allows a specific metadata to be queried
* \param[in] frame_metadata the frame_metadata to check for support
* \return true if the frame_metadata can be queried
*/
bool supports_frame_metadata(rs2_frame_metadata_value frame_metadata) const
{
rs2_error* e = nullptr;
auto r = rs2_supports_frame_metadata(frame_ref, frame_metadata, &e);
error::handle(e);
return r != 0;
}
/**
* retrieve frame number (from frame handle)
* \return the frame number of the frame, in milliseconds since the device was started
*/
unsigned long long get_frame_number() const
{
rs2_error* e = nullptr;
auto r = rs2_get_frame_number(frame_ref, &e);
error::handle(e);
return r;
}
/**
* retrieve data size from frame handle
* \return the number of bytes in frame
*/
const int get_data_size() const
{
rs2_error* e = nullptr;
auto r = rs2_get_frame_data_size(frame_ref, &e);
error::handle(e);
return r;
}
/**
* retrieve data from frame handle
* \return the pointer to the start of the frame data
*/
const void* get_data() const
{
rs2_error* e = nullptr;
auto r = rs2_get_frame_data(frame_ref, &e);
error::handle(e);
return r;
}
/**
* retrieve stream profile from frame handle
* \return stream_profile - the pointer to the stream profile
*/
stream_profile get_profile() const
{
rs2_error* e = nullptr;
auto s = rs2_get_frame_stream_profile(frame_ref, &e);
error::handle(e);
return stream_profile(s);
}
/**
* Template function, checking if current instance is the type of another class
* \return bool - true or false.
*/
template<class T>
bool is() const
{
T extension(*this);
return extension;
}
/**
* Template function, cast current instance as the type of another class
* \return class instance.
*/
template<class T>
T as() const
{
T extension(*this);
return extension;
}
/**
* Retrieve back the internal frame handle
* \return rs2_frame - internal frame handle.
*/
rs2_frame* get() const { return frame_ref; }
explicit operator rs2_frame*() { return frame_ref; }
frame apply_filter(filter_interface& filter)
{
return filter.process(*this);
}
protected:
/**
* add additional reference to a frame without duplicating frame data
* \param[out] result new frame reference, release by destructor
* \return true if cloning was successful
*/
void add_ref() const
{
rs2_error* e = nullptr;
rs2_frame_add_ref(frame_ref, &e);
error::handle(e);
}
void reset()
{
if (frame_ref)
{
rs2_release_frame(frame_ref);
}
frame_ref = nullptr;
}
private:
friend class rs2::frame_source;
friend class rs2::frame_queue;
friend class rs2::syncer;
friend class rs2::processing_block;
friend class rs2::pointcloud;
friend class rs2::points;
rs2_frame* frame_ref;
#ifdef _DEBUG
stream_profile profile;
unsigned long long frame_number = 0;
#endif
};
class video_frame : public frame
{
public:
/**
* Extends the frame class with additional video related attributes and functions
* \param[in] frame - existing frame instance
*/
video_frame(const frame& f)
: frame(f)
{
rs2_error* e = nullptr;
if (!f || (rs2_is_frame_extendable_to(f.get(), RS2_EXTENSION_VIDEO_FRAME, &e) == 0 && !e))
{
reset();
}
error::handle(e);
}
/**
* returns image width in pixels
* \return frame width in pixels
*/
int get_width() const
{
rs2_error* e = nullptr;
auto r = rs2_get_frame_width(get(), &e);
error::handle(e);
return r;
}
/**
* returns image height in pixels
* \return frame height in pixels
*/
int get_height() const
{
rs2_error* e = nullptr;
auto r = rs2_get_frame_height(get(), &e);
error::handle(e);
return r;
}
/**
* retrieve frame stride, meaning the actual line width in memory in bytes (not the logical image width)
* \return stride in bytes
*/
int get_stride_in_bytes() const
{
rs2_error* e = nullptr;
auto r = rs2_get_frame_stride_in_bytes(get(), &e);
error::handle(e);
return r;
}
/**
* retrieve bits per pixel
* \return number of bits per one pixel
*/
int get_bits_per_pixel() const
{
rs2_error* e = nullptr;
auto r = rs2_get_frame_bits_per_pixel(get(), &e);
error::handle(e);
return r;
}
/**
* retrieve bytes per pixel
* \return number of bytes per one pixel
*/
int get_bytes_per_pixel() const { return get_bits_per_pixel() / 8; }
};
struct vertex {
float x, y, z;
operator const float*() const { return &x; }
};
struct texture_coordinate {
float u, v;
operator const float*() const { return &u; }
};
class points : public frame
{
public:
/**
* Extends the frame class with additional point cloud related attributes and functions
*/
points() : frame(), _size(0) {}
/**
* Extends the frame class with additional point cloud related attributes and functions
* \param[in] frame - existing frame instance
*/
points(const frame& f)
: frame(f), _size(0)
{
rs2_error* e = nullptr;
if (!f || (rs2_is_frame_extendable_to(f.get(), RS2_EXTENSION_POINTS, &e) == 0 && !e))
{
reset();
}
error::handle(e);
if (get())
{
_size = rs2_get_frame_points_count(get(), &e);
error::handle(e);
}
}
/**
* Retrieve the vertices of the point cloud
* \param[in] vertex* - pointer of vertex sturcture
*/
const vertex* get_vertices() const
{
rs2_error* e = nullptr;
auto res = rs2_get_frame_vertices(get(), &e);
error::handle(e);
return (const vertex*)res;
}
/**
* Export the point cloud to a PLY file
* \param[in] string fname - file name of the PLY to be saved
* \param[in] video_frame texture - the texture for the PLY.
*/
void export_to_ply(const std::string& fname, video_frame texture)
{
rs2_frame* ptr = nullptr;
std::swap(texture.frame_ref, ptr);
rs2_error* e = nullptr;
rs2_export_to_ply(get(), fname.c_str(), ptr, &e);
error::handle(e);
}
/**
* Retrieve the texture coordinates (uv map) for the point cloud
* \return texture_coordinate* - pointer of texture coordinates.
*/
const texture_coordinate* get_texture_coordinates() const
{
rs2_error* e = nullptr;
auto res = rs2_get_frame_texture_coordinates(get(), &e);
error::handle(e);
return (const texture_coordinate*)res;
}
size_t size() const
{
return _size;
}
private:
size_t _size;
};
class depth_frame : public video_frame
{
public:
/**
* Extends the video_frame class with additional depth related attributes and functions
* \param[in] frame - existing frame instance
*/
depth_frame(const frame& f)
: video_frame(f)
{
rs2_error* e = nullptr;
if (!f || (rs2_is_frame_extendable_to(f.get(), RS2_EXTENSION_DEPTH_FRAME, &e) == 0 && !e))
{
reset();
}
error::handle(e);
}
/**
* Provide the depth in meters at the given pixel
* \param[in] int x - pixel's x coordinate.
* \param[in] int y - pixel's y coordinate.
* \return float - depth in metric units at given pixel
*/
float get_distance(int x, int y) const
{
rs2_error * e = nullptr;
auto r = rs2_depth_frame_get_distance(get(), x, y, &e);
error::handle(e);
return r;
}
/**
* Provide the scaling factor to use when converting from get_data() units to meters
* \return float - depth, in meters, per 1 unit stored in the frame data
*/
float get_units() const
{
rs2_error * e = nullptr;
auto r = rs2_depth_frame_get_units( get(), &e );
error::handle( e );
return r;
}
};
class disparity_frame : public depth_frame
{
public:
/**
* Extend depth_frame class with additional disparity related attributes/functions
* \param[in] frame - existing frame instance
*/
disparity_frame(const frame& f)
: depth_frame(f)
{
rs2_error* e = nullptr;
if (!f || (rs2_is_frame_extendable_to(f.get(), RS2_EXTENSION_DISPARITY_FRAME, &e) == 0 && !e))
{
reset();
}
error::handle(e);
}
/**
* Retrieve the distance between the two IR sensors.
* \return float - baseline.
*/
float get_baseline(void) const
{
rs2_error * e = nullptr;
auto r = rs2_depth_stereo_frame_get_baseline(get(), &e);
error::handle(e);
return r;
}
};
class motion_frame : public frame
{
public:
/**
* Extends the frame class with additional motion related attributes and functions
* \param[in] frame - existing frame instance
*/
motion_frame(const frame& f)
: frame(f)
{
rs2_error* e = nullptr;
if (!f || (rs2_is_frame_extendable_to(f.get(), RS2_EXTENSION_MOTION_FRAME, &e) == 0 && !e))
{
reset();
}
error::handle(e);
}
/**
* Retrieve the motion data from IMU sensor
* \return rs2_vector - 3D vector in Euclidean coordinate space.
*/
rs2_vector get_motion_data() const
{
auto data = reinterpret_cast<const float*>(get_data());
return rs2_vector{ data[0], data[1], data[2] };
}
};
class pose_frame : public frame
{
public:
/**
* Extends the frame class with additional pose related attributes and functions
* \param[in] frame - existing frame instance
*/
pose_frame(const frame& f)
: frame(f)
{
rs2_error* e = nullptr;
if (!f || (rs2_is_frame_extendable_to(f.get(), RS2_EXTENSION_POSE_FRAME, &e) == 0 && !e))
{
reset();
}
error::handle(e);
}
/**
* Retrieve the pose data from T2xx position tracking sensor
* \return rs2_pose - orientation and velocity data.
*/
rs2_pose get_pose_data() const
{
rs2_pose pose_data;
rs2_error* e = nullptr;
rs2_pose_frame_get_pose_data(get(), &pose_data, &e);
error::handle(e);
return pose_data;
}
};
class frameset : public frame
{
public:
/**
* Extends the frame class with additional frameset related attributes and functions
*/
frameset() :_size(0) {};
/**
* Extends the frame class with additional frameset related attributes and functions
* \param[in] frame - existing frame instance
*/
frameset(const frame& f)
: frame(f), _size(0)
{
rs2_error* e = nullptr;
if (!f || (rs2_is_frame_extendable_to(f.get(), RS2_EXTENSION_COMPOSITE_FRAME, &e) == 0 && !e))
{
reset();
// TODO - consider explicit constructor to move resultion to compile time
}
error::handle(e);
if (get())
{
_size = rs2_embedded_frames_count(get(), &e);
error::handle(e);
}
}
/**
* Retrieve the first frame of a specific stream and optionally with a specific format. If no frame is found, return an empty frame instance.
* \param[in] rs2_stream s - frame to be retrieved from this stream type.
* \param[in] rs2_format f - frame to be retrieved from this format type.
* \return frame - first found frame with s stream type.
*/
frame first_or_default(rs2_stream s, rs2_format f = RS2_FORMAT_ANY) const
{
frame result;
foreach_rs([&result, s, f](frame frm) {
if (!result && frm.get_profile().stream_type() == s && (f == RS2_FORMAT_ANY || f == frm.get_profile().format()))
{
result = std::move(frm);
}
});
return result;
}
/**
* Retrieve the first frame of a specific stream type and optionally with a specific format. If no frame is found, an error will be thrown.
* \param[in] rs2_stream s - frame to be retrieved from this stream type.
* \param[in] rs2_format f - frame to be retrieved from this format type.
* \return frame - first found frame with s stream type.
*/
frame first(rs2_stream s, rs2_format f = RS2_FORMAT_ANY) const
{
auto frm = first_or_default(s, f);
if (!frm) throw error("Frame of requested stream type was not found!");
return frm;
}
/**
* Retrieve the first depth frame, if no frame is found, return an empty frame instance.
* \return depth_frame - first found depth frame.
*/
depth_frame get_depth_frame() const
{
auto f = first_or_default(RS2_STREAM_DEPTH, RS2_FORMAT_Z16);
return f.as<depth_frame>();
}
/**
* Retrieve the first color frame, if no frame is found, search for the color frame from IR stream. If one still can't be found, return an empty frame instance.
* \return video_frame - first found color frame.
*/
video_frame get_color_frame() const
{