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39
40 #include "directshowvideobuffer.h"
41
42 QT_BEGIN_NAMESPACE
43
DirectShowVideoBuffer(IMediaSample * sample,int bytesPerLine)44 DirectShowVideoBuffer::DirectShowVideoBuffer(IMediaSample *sample, int bytesPerLine)
45 : QAbstractVideoBuffer(NoHandle)
46 , m_sample(sample)
47 , m_bytesPerLine(bytesPerLine)
48 , m_mapMode(NotMapped)
49 {
50 m_sample->AddRef();
51 }
52
~DirectShowVideoBuffer()53 DirectShowVideoBuffer::~DirectShowVideoBuffer()
54 {
55 m_sample->Release();
56 }
57
map(MapMode mode,int * numBytes,int * bytesPerLine)58 uchar *DirectShowVideoBuffer::map(MapMode mode, int *numBytes, int *bytesPerLine)
59 {
60 if (m_mapMode == NotMapped && mode != NotMapped) {
61 if (numBytes)
62 *numBytes = m_sample->GetActualDataLength();
63
64 if (bytesPerLine)
65 *bytesPerLine = m_bytesPerLine;
66
67 BYTE *bytes = nullptr;
68
69 if (m_sample->GetPointer(&bytes) == S_OK) {
70 m_mapMode = mode;
71
72 return reinterpret_cast<uchar *>(bytes);
73 }
74 }
75 return nullptr;
76 }
77
unmap()78 void DirectShowVideoBuffer::unmap()
79 {
80 m_mapMode = NotMapped;
81 }
82
mapMode() const83 QAbstractVideoBuffer::MapMode DirectShowVideoBuffer::mapMode() const
84 {
85 return m_mapMode;
86 }
87
88 QT_END_NAMESPACE
89