MP4

Section: MP4 File Format Library (3) Updated: Version 0.9 Local index Up

NAME

MP4AddAudioTrack - Add an audio track

SYNTAX

#include <mp4.h>

MP4TrackId MP4AddAudioTrack(
       MP4FileHandle hFile,

       u_int32_t timeScale,

       u_int32_t sampleDuration,

       u_int8_t audioType = MP4_MPEG4_AUDIO_TYPE

)

ARGUMENTS

hFile: Specifies the mp4 file to which the operation applies.
timeScale: Specifies the time scale in ticks per second of the track.
sampleDuration: Specifies a fixed sample duration for all track samples. Caveat: The value should be in track time scale units
audioType: Specifies the audio encoding type. See MP4GetTrackAudioType() for known values.

RETURN VALUES

Upon success, the track id of the new track. Upon an error, MP4_INVALID_TRACK_ID.

DESCRIPTION

MP4AddAudioTrack adds an audio track to the mp4 file. MP4WriteSample() can then be used to add the desired audio samples.

It is recommended that the time scale be set to the sampling frequency (e.g. 44100 Hz) of the audio so as to preserve the timing information accurately.

If the audio encoding uses a fixed duration for each sample that should be specified here. If not then the value MP4_INVALID_SAMPLE_DURATION should be given for the sampleDuration argument.

This document was created by man2html, using the manual pages.
Time: 21:50:32 GMT, April 16, 2011