MMTIME structure

The MMTIME structure contains timing information for different types of multimedia data.

Syntax

typedef struct mmtime_tag {
  UINT  wType;
  union {
    DWORD  ms;
    DWORD  sample;
    DWORD  cb;
    DWORD  ticks;
    struct {
      BYTE hour;
      BYTE min;
      BYTE sec;
      BYTE frame;
      BYTE fps;
      BYTE dummy;
      BYTE pad[2];
    } smpte;
    struct {
      DWORD songptrpos;
    } midi;
  } u;
} MMTIME, *PMMTIME, *LPMMTIME;

Members

• wType
  Time format. It can be one of the following values.

  Format	Description
  TIME_BYTES	Current byte offset from beginning of the file.
  TIME_MIDI	MIDI time.
  TIME_MS	Time in milliseconds.
  TIME_SAMPLES	Number of waveform-audio samples.
  TIME_SMPTE	SMPTE (Society of Motion Picture and Television Engineers) time.
  TIME_TICKS	Ticks within a MIDI stream.

   

• u
  A union that contains the following members.

  • ms
    Number of milliseconds. Used when wType is TIME_MS.

  • sample
    Number of samples. Used when wType is TIME_SAMPLES.

  • cb
    Byte count. Used when wType is TIME_BYTES.

  • ticks
    Ticks in MIDI stream. Used when wType is TIME_TICKS.

  • smpte
    SMPTE time structure. Used when wType is TIME_SMPTE.

    • hour
      Hours.

    • min
      Minutes.

    • sec
      Seconds.

    • frame
      Frames.

    • fps
      Frames per second (24, 25, 29 (30 drop), or 30).

    • dummy
      Dummy byte for alignment.

    • pad
      Padding.

  • midi
    MIDI time structure. Used when wType is TIME_MIDI.

    • songptrpos
      Song pointer position.

Requirements

See also

Multimedia Timers

Multimedia Timer Structures