.TH "MP4" "3" "Version 0.9" "Cisco Systems Inc." "MP4 File Format Library"
.SH "NAME"
.LP 
\fBMP4GetTrackAudioMpeg4Type\fR \- Get the encoding type of an MPEG\-4 audio track
.SH "SYNTAX"
.LP 
#include <mp4.h>
.LP 
u_int8_t \fBMP4GetTrackAudioMpeg4Type\fR(
.br 
	MP4FileHandle \fIhFile\fP,
.br 
	MP4TrackId \fItrackId\fP
.br 
)
.SH "ARGUMENTS"
.LP 
.TP 
\fIhFile\fP
Specifies the mp4 file to which the operation applies.
.TP 
\fItrackId\fP
Specifies the track for which the MPEG\-4 audio type is desired.
.SH "RETURN VALUES"
.LP 
Upon success, the MPEG\-4 audio type of the track. Upon error, MP4_MPEG4_INVALID_AUDIO_TYPE is returned.
.SH "DESCRIPTION"
.LP 
\fBMP4GetTrackAudioMpeg4Type\fR returns the MPEG\-4 encoding type of the specified MPEG\-4 audio track in the mp4 file. If an mp4 audio track has type MP4_MPEG4_AUDIO_TYPE, this call can be used to determine which specific MPEG\-4 audio encoding is contained in the track. (Note: This information is retrieved from the audio track ES configuration.)
.LP 
Known audio encoding types are:
.LP 
MP4_MPEG4_AAC_MAIN_AUDIO_TYPE
.br 
	MPEG\-4 AAC Main profile
.LP 
MP4_MPEG4_AAC_LC_AUDIO_TYPE	
.br 
	MPEG\-4 AAC Low Complexity profile
.LP 
MP4_MPEG4_AAC_SSR_AUDIO_TYPE 
.br 
	MPEG\-4 AAC SSR profile
.LP 
MP4_MPEG4_AAC_LTP_AUDIO_TYPE 
.br 
	MPEG\-4 AAC Long Term Prediction profile
.LP 
MP4_MPEG4_AAC_SCALABLE_AUDIO_TYPE 
.br 
	MPEG\-4 AAC Scalable
.LP 
MP4_MPEG4_CELP_AUDIO_TYPE 
.br 
	MPEG\-4 CELP
.LP 
MP4_MPEG4_HVXC_AUDIO_TYPE 
.br 
	MPEG\-4 HVXC
.LP 
MP4_MPEG4_TTSI_AUDIO_TYPE 
.br 
	MPEG\-4 Text To Speech
.LP 
MP4_MPEG4_MAIN_SYNTHETIC_AUDIO_TYPE 
.br 
	MPEG\-4 Main Synthetic profile
.LP 
MP4_MPEG4_WAVETABLE_AUDIO_TYPE 
.br 
	MPEG\-4 Wavetable Synthesis profile
.LP 
MP4_MPEG4_MIDI_AUDIO_TYPE 
.br 
	MPEG\-4 MIDI profile
.LP 
MP4_MPEG4_ALGORITHMIC_FX_AUDIO_TYPE 
.br 
	MPEG\-4 Algorithmic Synthesis and Audio FX profile

.SH "SEE ALSO"
.LP 
MP4(3) MP4GetTrackAudioType(3)