gstBufferManager Class Reference

gstBufferManager recieves GStreamer buffers from appsink elements and unpacks/maps them into CUDA address space, and handles colorspace conversion into RGB format. More...

#include <gstBufferManager.h>

Public Member Functions
	gstBufferManager (videoOptions *options)
	Constructor. More...
	~gstBufferManager ()
	Destructor. More...
bool	Enqueue (GstBuffer *buffer, GstCaps *caps)
	Enqueue a GstBuffer from GStreamer. More...
int	Dequeue (void **output, imageFormat format, uint64_t timeout=UINT64_MAX)
	Dequeue the next frame. More...
uint64_t	GetLastTimestamp () const
	Get timestamp of the latest dequeued frame. More...
imageFormat	GetRawFormat () const
	Get raw image format. More...
uint64_t	GetFrameCount () const
	Get the total number of frames that have been recieved. More...

Protected Attributes
imageFormat	mFormatYUV
	The YUV colorspace format coming from appsink (typically NV12 or YUY2) More...
RingBuffer	mBufferYUV
	Ringbuffer of CPU-based YUV frames (non-NVMM) that come from appsink. More...
RingBuffer	mTimestamps
	Ringbuffer of timestamps that come from appsink. More...
RingBuffer	mBufferRGB
	Ringbuffer of frames that have been converted to RGB colorspace. More...
uint64_t	mLastTimestamp
	Timestamp of the latest dequeued frame. More...
Event	mWaitEvent
	Event that gets triggered when a new frame is recieved. More...
videoOptions *	mOptions
	Options of the gstDecoder / gstCamera object. More...
uint64_t	mFrameCount
	Total number of frames that have been recieved. More...
bool	mNvmmUsed
	Is NVMM memory actually used by the stream? More...

Detailed Description

gstBufferManager recieves GStreamer buffers from appsink elements and unpacks/maps them into CUDA address space, and handles colorspace conversion into RGB format.

It can handle both normal CPU-based GStreamer buffers and NVMM memory which can be mapped directly to the GPU without requiring memory copies using the CPU.

To disable the use of NVMM memory, set -DENABLE_NVMM=OFF when building with CMake:

cmake -DENABLE_NVMM=OFF ../

Constructor & Destructor Documentation

gstBufferManager()

gstBufferManager::gstBufferManager

(

videoOptions *

options

)

Constructor.

~gstBufferManager()

gstBufferManager::~gstBufferManager

(

)

Destructor.

Member Function Documentation

Dequeue()

int gstBufferManager::Dequeue	(	void **	output,
		imageFormat	format,
		uint64_t	timeout = UINT64_MAX
	)

Dequeue the next frame.

Returns 1 on success, 0 on timeout, -1 on error.

Enqueue()

bool gstBufferManager::Enqueue	(	GstBuffer *	buffer,
		GstCaps *	caps
	)

Enqueue a GstBuffer from GStreamer.

GetFrameCount()

uint64_t gstBufferManager::GetFrameCount ( ) const

inline

Get the total number of frames that have been recieved.

GetLastTimestamp()

uint64_t gstBufferManager::GetLastTimestamp ( ) const

inline

Get timestamp of the latest dequeued frame.

GetRawFormat()

imageFormat gstBufferManager::GetRawFormat ( ) const

inline

Get raw image format.

Member Data Documentation

mBufferRGB

RingBuffer gstBufferManager::mBufferRGB

protected

Ringbuffer of frames that have been converted to RGB colorspace.

mBufferYUV

RingBuffer gstBufferManager::mBufferYUV

protected

Ringbuffer of CPU-based YUV frames (non-NVMM) that come from appsink.

mFormatYUV

imageFormat gstBufferManager::mFormatYUV

protected

The YUV colorspace format coming from appsink (typically NV12 or YUY2)

mFrameCount

uint64_t gstBufferManager::mFrameCount

protected

Total number of frames that have been recieved.

mLastTimestamp

uint64_t gstBufferManager::mLastTimestamp

protected

Timestamp of the latest dequeued frame.

mNvmmUsed

bool gstBufferManager::mNvmmUsed

protected

Is NVMM memory actually used by the stream?

mOptions

videoOptions* gstBufferManager::mOptions

protected

Options of the gstDecoder / gstCamera object.

mTimestamps

RingBuffer gstBufferManager::mTimestamps

protected

Ringbuffer of timestamps that come from appsink.

mWaitEvent

Event gstBufferManager::mWaitEvent

protected

Event that gets triggered when a new frame is recieved.

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The documentation for this class was generated from the following file:

• jetson-utils/gstBufferManager.h