mp4getsampletime.3

来自「网络MPEG4IP流媒体开发源代码」· 3 代码 · 共 39 行

.TH "MP4" "3" "Version 0.9" "Cisco Systems Inc." "MP4 File Format Library"
.SH "NAME"
.LP 
\fBMP4GetSampleTime\fR \- Get the start time of a track sample
.SH "SYNTAX"
.LP 
#include <mp4.h>
.LP 
MP4Timestamp \fBMP4GetSampleTime\fR(
.br 
	MP4FileHandle \fIhFile\fP,
.br 
	MP4TrackId \fItrackId\fP,
.br 
	MP4SampleId \fIsampleId\fP
.br 
);
.SH "ARGUMENTS"
.LP 
.TP 
\fIhFile\fP
Specifies the mp4 file to which the operation applies.
.TP 
\fItrackId\fP
Specifies the track to which the operation applies.
.TP 
\fIsampleId\fP
Specifies the sample to which the operation applies. Caveat: the first sample has id 1 not 0.

.SH "RETURN VALUES"
.LP 
Upon success, the sample start time in track time scale units. Upon an error, MP4_INVALID_TIMESTAMP.
.SH "DESCRIPTION"
.LP 
\fBMP4GetSampleTime\fR returns the start time of the specified sample from the specified track in the track time scale units. See MP4ConvertFromTrackTimestamp() for how to map this value to another time scale.
.SH "SEE ALSO"
.LP 
MP4(3) MP4ConvertFromTrackDuration(3)