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Specifying Time Formats
Multimedia data types typically can use time to identify significant positions
within their content. Common time formats are milliseconds, tracks, and
frames; other less common time formats, such as SMPTE (Society of Motion Picture and
Television Engineers) 24, also exist. Time is the format and reference system
for waveform-audio, MIDI, and CD audio data. Video supports time even though it
is recorded as a sequence of frames (stream) that is typically played at a
specific speed. Several macros are available for designating time format.
You can retrieve the current time format for a file or device by using the MCIWndGetTimeFormat macro. You can change the current time format to any other time format
supported by a device by using the MCIWndSetTimeFormat macro. Or you can the set the time format to milliseconds or frames by using
the MCIWndUseTime or MCIWndUseFrames macros.
Note Noncontinuous formats, such as tracks and SMPTE, can cause the toolbar to
behave erratically. For these time formats, you might want to turn off the
toolbar by specifying the MCIWNDF_NOPLAYBAR window style when creating an MCIWnd
window.
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