1MP4(3)                      MP4 File Format Library                     MP4(3)
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NAME

6       MP4AddAudioTrack - Add an audio track
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SYNTAX

9       #include <mp4.h>
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11       MP4TrackId MP4AddAudioTrack(
12            MP4FileHandle hFile,
13            u_int32_t timeScale,
14            u_int32_t sampleDuration,
15            u_int8_t audioType = MP4_MPEG4_AUDIO_TYPE
16       )
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ARGUMENTS

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

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

38       MP4AddAudioTrack adds an audio track to the mp4 file.  MP4WriteSample()
39       can then be used to add the desired audio samples.
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41       It  is recommended that the time scale be set to the sampling frequency
42       (e.g. 44100 Hz) of the audio so as to preserve the  timing  information
43       accurately.
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45       If the audio encoding uses a fixed duration for each sample that should
46       be specified here. If not then  the  value  MP4_INVALID_SAMPLE_DURATION
47       should be given for the sampleDuration argument.
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SEE ALSO

52       MP4(3)
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56Cisco Systems Inc.                Version 0.9                           MP4(3)