NAME
MP4GetNumberOfTracks - Get the number of tracks
SYNTAX
#include <mp4.h>
u_int32_t MP4GetNumberOfTracks(
MP4FileHandle hFile,
const char* type = NULL,
u_int8_t subType = 0
)
ARGUMENTS
hFile Specifies the mp4 file to which the operation applies.
type Species the type of track for which a count is desired. A NULL
value implies any type of track. See MP4GetTrackType() for
predefined values.
subType
Specifies the subtype of the tracks to be counted. Subtypes are
only defined for audio and video tracks, see
MP4GetAudioTrackType() and MP4GetVideoTrackType() for predefined
values. A zero value implies any subtype.
RETURN VALUES
The number of tracks of the specified type and subType in the mp4 file.
DESCRIPTION
MP4GetNumberOfTracks returns how many tracks of the specified type and
subtype exist in the mp4 file. This can be used to determine if an mp4
file contains a track of a given type of media, for instance audio or
video. It can also be used to determine if multiple options may be
available. For instance multiple audio tracks in different languages.
For audio and video tracks, a subtype can be specified to only count
tracks of a particular encoding.
SEE ALSO
MP4(3)