SampleGrabberCallback Class Reference

Inheritance diagram for SampleGrabberCallback:

Collaboration diagram for SampleGrabberCallback:

Public Member Functions
	SampleGrabberCallback (struct vidcap_dshow_state *s, unsigned long *frameNumber)
	~SampleGrabberCallback ()
STDMETHODIMP	BufferCB (double sampleTime, BYTE *buffer, long len)
STDMETHODIMP	QueryInterface (REFIID iface, void **pointer)
STDMETHODIMP	SampleCB (double sampleTime, IMediaSample *ms)
	STDMETHODIMP_ (unsigned long) AddRef()
	STDMETHODIMP_ (unsigned long) Release()

Public Attributes
unsigned long *	frameNumber
struct vidcap_dshow_state *	s

Detailed Description

Definition at line 113 of file DirectShowGrabber.cpp.

Constructor & Destructor Documentation

SampleGrabberCallback()

SampleGrabberCallback::SampleGrabberCallback ( struct vidcap_dshow_state * s, unsigned long * frameNumber )

inline

Definition at line 131 of file DirectShowGrabber.cpp.

                                                                                        :
        frameNumber(frameNumber),
        s(s)
        {
                if (frameNumber != NULL) *frameNumber = 0;
        }

References frameNumber.

~SampleGrabberCallback()

SampleGrabberCallback::~SampleGrabberCallback ( )

inline

Definition at line 137 of file DirectShowGrabber.cpp.

{}

Member Function Documentation

BufferCB()

STDMETHODIMP SampleGrabberCallback::BufferCB ( double sampleTime, BYTE * buffer, long len )

inline

Definition at line 146 of file DirectShowGrabber.cpp.

                                                                         {
                UNUSED(sampleTime);
                
                if (len <= 0) return S_OK;
 
                EnterCriticalSection(&s->returnBufferCS);
                const long req_len = vc_get_datalen(
                    s->desc.width, s->desc.height, s->desc.color_spec);
                if (s->grabBufferLen != req_len) {
                        s->grabBuffer = (BYTE *) realloc((void *) s->grabBuffer, req_len);
                        if (s->grabBuffer == NULL) {
                                s->grabBufferLen = 0;
                                return S_OK;
                        }
                        s->grabBufferLen = len;
                }
 
                // We need to make a copy, DirectShow will do something with the data
                if (s->convert != nullptr) {
                        s->convert(s->desc.width, s->desc.height, buffer, s->grabBuffer);
                } else {
                        memcpy((char *) s->grabBuffer, (char *) buffer, len);
                }
 
                bool grabMightWait = false;
                if (!s->haveNewReturnBuffer) {
                        grabMightWait = true;
                        s->haveNewReturnBuffer = true;
                }
                LeaveCriticalSection(&s->returnBufferCS);
                if (grabMightWait) {
                        LOG(LOG_LEVEL_DEBUG) << MOD_NAME << "WakeConditionVariable s->grabWaitCV\n";
                        WakeConditionVariable(&s->grabWaitCV);
                }
 
                return S_OK;
        }

References video_desc::color_spec, vidcap_dshow_state::convert, vidcap_dshow_state::desc, vidcap_dshow_state::grabBuffer, vidcap_dshow_state::grabBufferLen, vidcap_dshow_state::grabWaitCV, vidcap_dshow_state::haveNewReturnBuffer, video_desc::height, len, LOG, LOG_LEVEL_DEBUG, MOD_NAME, vidcap_dshow_state::returnBufferCS, s, UNUSED, vc_get_datalen(), and video_desc::width.

Here is the call graph for this function:

QueryInterface()

STDMETHODIMP SampleGrabberCallback::QueryInterface ( REFIID iface, void ** pointer )

inline

Definition at line 121 of file DirectShowGrabber.cpp.

                                                                  {
                if (pointer == NULL) return E_POINTER;
                if (iface == IID_IUnknown || iface == IID_ISampleGrabberCB) {
                        (*pointer) = this;
                        return S_OK;
                }
                *pointer = NULL;
                return E_NOINTERFACE;
        }

SampleCB()

STDMETHODIMP SampleGrabberCallback::SampleCB ( double sampleTime, IMediaSample * ms )

inline

Definition at line 139 of file DirectShowGrabber.cpp.

                                                                   {
                UNUSED(sampleTime);
                UNUSED(ms);
 
                return S_OK;
        }

References UNUSED.

STDMETHODIMP_() [1/2]

SampleGrabberCallback::STDMETHODIMP_ ( unsigned long )

inline

Definition at line 119 of file DirectShowGrabber.cpp.

{ return 2; }

STDMETHODIMP_() [2/2]

SampleGrabberCallback::STDMETHODIMP_ ( unsigned long )

inline

Definition at line 120 of file DirectShowGrabber.cpp.

{ return 1; }

Member Data Documentation

frameNumber

unsigned long* SampleGrabberCallback::frameNumber

Definition at line 115 of file DirectShowGrabber.cpp.

Referenced by SampleGrabberCallback().

s

struct vidcap_dshow_state* SampleGrabberCallback::s

Definition at line 116 of file DirectShowGrabber.cpp.

Referenced by BufferCB().

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

• src/video_capture/DirectShowGrabber.cpp