AVCSTRM_FORMAT_INFO structure (avcstrm.h)
The AVCSTRM_FORMAT_INFO structure is used to describe a data stream.
Syntax
typedef struct _AVCSTRM_FORMAT_INFO {
ULONG SizeOfThisBlock;
AVCSTRM_FORMAT AVCStrmFormat;
CIP_HDR1 cipHdr1;
CIP_HDR2_SYT cipHdr2;
ULONG SrcPacketsPerFrame;
ULONG FrameSize;
ULONG NumOfRcvBuffers;
ULONG NumOfXmtBuffers;
DWORD OptionFlags;
ULONG AvgTimePerFrame;
ULONG BlockPeriod;
ULONG Reserved[4];
} AVCSTRM_FORMAT_INFO, *PAVCSTRM_FORMAT_INFO;
Members
SizeOfThisBlock
Specifies the size of this data structure, in bytes.
AVCStrmFormat
Specifies one of the AV/C streaming subunit formats defined in AVCSTRM_FORMAT.
cipHdr1
Specifies the definition of the first quadlet of the two quadlet CIP header.
cipHdr2
Specifies the definition of the second quadlet of the two quadlet CIP header.
SrcPacketsPerFrame
Specifies the number of source packets to fill a data frame.
FrameSize
Specifies the data buffer size.
NumOfRcvBuffers
Specifies the number of receiving buffers.
NumOfXmtBuffers
Specifies the number of transmitting buffers.
OptionFlags
Specifies any option flags. Currently, only one flag is defined:
| Flag | Description |
|---|---|
| AVCSTRM_FORMAT_OPTION_STRIP_SPH | Strip the SPH (source packet header) from the 192-byte data packet for MPEG2TS. |
AvgTimePerFrame
Specifies the average time per frame in 100 nanosecond units.
BlockPeriod
Specifies the block period. This is used for transmit only. It is calculated from 1/ BlockPerSecond 1,000,000,000 picoseconds. For SDDV, it transmits one block per 1394 cycle. 1/(29.97 250) * 1,000,000,000,000 = 133,466,800 picoseconds.
Reserved[4]
Reserved. Do not use. Must be set to 0.
Requirements
| Requirement | Value |
|---|---|
| Header | avcstrm.h (include Avcstrm.h) |