1MP4(3) MP4 File Format Library MP4(3)
2
3
4
6 MP4AddAudioTrack - Add an audio track
7
9 #include <mp4.h>
10
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 )
17
19 hFile Specifies the mp4 file to which the operation applies.
20
21 timeScale
22 Specifies the time scale in ticks per second of the track.
23
24 sampleDuration
25 Specifies a fixed sample duration for all track samples. Caveat:
26 The value should be in track time scale units
27
28 audioType
29 Specifies the audio encoding type. See MP4GetTrackAudioType()
30 for known values.
31
33 Upon success, the track id of the new track. Upon an error,
34 MP4_INVALID_TRACK_ID.
35
36
38 MP4AddAudioTrack adds an audio track to the mp4 file. MP4WriteSample()
39 can then be used to add the desired audio samples.
40
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.
44
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.
48
49
50
52 MP4(3)
53
54
55
56Cisco Systems Inc. Version 0.9 MP4(3)