AM_SAMPLE2_PROPERTIES (Windows Embedded CE 6.0)

1/6/2010

This structure describes the properties of a generic media sample.

Syntax

typedef struct tagAM_SAMPLE2_PROPERTIES {
  DWORD cbData;
  DWORD dwTypeSpecificFlags;
  DWORD dwSampleFlags;
  LONG lActual;
  REFERENCE_TIME tStart;
  REFERENCE_TIME tStop;
  DWORD dwStreamId;
  AM_MEDIA_TYPE* pMediaType;
  BYTE* pbBuffer;
  LONG cbBuffer;
} AM_SAMPLE2_PROPERTIES;

Members

• cbData
  Length of property data for extensibility; number of bytes including this field.

• dwTypeSpecificFlags
  Type-specific flag data. These flags are defined separately for each media type. Default is zero.

• dwSampleFlags
  Flags bits defined by the AM_SAMPLE_PROPERTY_FLAGS enumerated data type or by the defined constants described in Remarks.

  All undefined bits are reserved. Set them to zero, and do not copy them.

• lActual
  Length of data in the buffer pointed to by the pbBuffer member.

• tStart
  Start time if valid.

• tStop
  Stop time if valid.

• dwStreamId
  Stream identifier. Stream 0 is the normal media transport. Stream 1 is control. Currently, only Stream 0 is used. Filters should pass any other stream ID directly to their output pins without processing.

• pMediaType
  Copy of the media type. It becomes invalid after the sample has been released.

• pbBuffer
  Pointer to the buffer. The pointer becomes invalid after the sample is released.

• cbBuffer
  Total length of the buffer pointed to by pbBuffer, in bytes.

Remarks

The IMediaSample2 interface uses this structure.

The dwSampleFlags parameter can take values from the AM_SAMPLE_PROPERTY_FLAGS enumerated data type or one or more of the following defined constants.

High-end video is typically formatted as alternate scan lines rather than as whole frames. Thus, the first field of a high-end video sample often contains odd lines of the video (lines 1, 3, 5, and so on) while the second field of the sample often contains the even lines of the video (lines 2, 4, 6, and so on).

Many of the following constants describe the samples of high-end video: whether the sample is a field1, field2, or frame, and how the sample should be displayed.

Requirements

See Also

Reference

DirectShow Structures