mp4converttotracktimestamp.3

网络MPEG4IP流媒体开发源代码

.TH "MP4" "3" "Version 0.9" "Cisco Systems Inc." "MP4 File Format Library"
.SH "NAME"
.LP 
\fBMP4ConvertToTrackTimestamp\fR \- Convert a timestamp from a specified time scale to the track time scale.
.SH "SYNTAX"
.LP 
#include <mp4.h>
.LP 
MP4Timestamp \fBMP4ConvertToTrackTimestamp\fR(
.br 
	MP4FileHandle \fIhFile\fP,
.br 
	MP4TrackId \fItrackId\fP,
.br 
	u_int64_t \fItimestamp\fP,
.br 
	u_int32_t \fIoldTimeScale\fP
.br 
)
.SH "ARGUMENTS"
.LP 
.TP 
\fIhFile\fP
Specifies the mp4 file to which the operation applies.
.TP 
\fItrackId\fP
Specifies the track from which the duration originates.
.TP 
\fItimestamp\fP
Specifies the timestamp that is to be converted.
.TP 
\fIoldTimeScale\fP
Specifies the time scale in ticks per second in which the timestamp is currently expressed.
.SH "RETURN VALUES"
.LP 
Upon success, the timestamp in the track time scale units. Upon error, MP4_INVALID_TIMESTAMP.
.SH "DESCRIPTION"
.LP 
\fBMP4ConvertToTrackTimestamp\fR converts a timestamp such as a sample start time from the specified time scale to the track time scale. 
.SH "SEE ALSO"
.LP 
MP4(3) MP4ConvertFromTrackTimestamp(3)