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MntYUVFrame Class Reference

MntYUVFrame is an abstraction for a uncompressed image in YUV color space. More...

#include <mnt_yuv_frame.h>

Inheritance diagram for MntYUVFrame:


Public Member Functions
int	get_width ()
int	get_height ()
int	get_csss ()
	MntYUVFrame ()
	An empty constructor that do nothing.
	MntYUVFrame (int w, int h, uint32_t ssrc, int csss, unsigned char *buf)
	Constructor for MntYUVFrame object.
void	copy_to (MntYUVFrame *target)
	Copy this YUV frame to another YUV frame.
void	set_buffer (unsigned char *buf)
	Change the buffer that contains the YUV image.
Public Attributes
char	frame_type_
int	frame_no_
int	width_
int	height_
int	csss_
uint32_t	ssrc_
MntByteImage	y_
MntByteImage	u_
MntByteImage	v_

Detailed Description

MntYUVFrame is an abstraction for a uncompressed image in YUV color space.

An MntYUVFrame object contains three MntByteImage objects, one of each of Y, U, and V color plane. It also contains members that indicates the color sub-sampling scheme, the width and the height of the frame. Additional information regarding the origin of this frame such as the SSRC, the frame number (in display order) and the frame type ('i', 'p', or 'b') are stored in MntYUVFrame object as well.

Note:: Current implementation always assume 4:2:0 color-subsampling regarding of the value of csss_.

Constructor & Destructor Documentation

MntYUVFrame::MntYUVFrame ( int w,

int h,

uint32_t ssrc,

int csss,

unsigned char * buf

)

Constructor for MntYUVFrame object.
A buffer that contains uncompressed YUV data, needs to be passed in. The pixels are assumed to be stored in the following order:
YYYYYYY.......YUUUU......UVVVV......V
An MntYUVFrame object points its pointers to this buffer. Thus, the input buffer should NOT be freed nor modified while MntYUVFrame is still using the buffer.
Regardless of csss, we assume the input YUV has 4:2:0 sub-sampling. The input SSRC is ignored. These certainly need to be fixed in the future.

Parameters:

w width of the image

h height of the image

ssrc SSRC of the RTP source where this image comes from (if applicable). Ignored in current implementation.

csss Color sub-sampling scheme of the YUV image. Ignored in current implementation. Always assume 4:2:0.

buf A memory buffer that contains uncompressed image.

Member Function Documentation

void MntYUVFrame::copy_to ( MntYUVFrame * target )

Copy this YUV frame to another YUV frame.

Parameters:

target The destination YUV frame to copy this frame into.

void MntYUVFrame::set_buffer ( unsigned char * buf )

Change the buffer that contains the YUV image.
The new buffer should be of the same width and height as the width and height specified in constructor and has 4:2:0 color sub-sampling.

Parameters:

buf Pointer to memory locations that contains the new uncompressed YUV image.