mp4setaudioprofilelevel.3

来自「网络MPEG4IP流媒体开发源代码」· 3 代码 · 共 68 行

.TH "MP4" "3" "Version 0.9" "Cisco Systems Inc." "MP4 File Format Library"
.SH "NAME"
.LP 
\fBMP4SetAudioProfileLevel\fR \- Sets the minimum MPEG\-4 audio profile and level required to render the contents of the file
.SH "SYNTAX"
.LP 
#include <mp4.h>
.LP 
bool \fBMP4SetAudioProfileLevel\fR(
.br 
        MP4FileHandle \fIhFile\fP,
.br 
        u_int8_t \fIprofileLevel\fP
.br 
)
.SH "ARGUMENTS"
.LP 
.TP 
\fIhFile\fP
Specifies the mp4 file to which the operation applies.
.SH "RETURN VALUES"
.LP 
Upon success, true (1). Upon an error, false (0).
.SH "DESCRIPTION"
.LP 
\fBMP4SetAudioProfileLevel\fR sets the minumum profile/level of MPEG\-4 audio support necessary to render the contents of the file.
.LP 
ISO/IEC 14496\-1:2001 MPEG\-4 Systems defines the following values:
.br 
	0x00		Reserved
.br 
	0x01		Main Profile @ Level 1
.br 
	0x02		Main Profile @ Level 2
.br 
	0x03		Main Profile @ Level 3
.br 
	0x04		Main Profile @ Level 4
.br 
	0x05		Scalable Profile @ Level 1
.br 
	0x06		Scalable Profile @ Level 2
.br 
	0x07		Scalable Profile @ Level 3
.br 
	0x08		Scalable Profile @ Level 4
.br 
	0x09		Speech Profile @ Level 1
.br 
	0x0A		Speech Profile @ Level 2
.br 
	0x0B		Synthesis Profile @ Level 1
.br 
	0x0C		Synthesis Profile @ Level 2
.br 
	0x0D		Synthesis Profile @ Level 3
.br 
	0x0E\-0x7F	Reserved
.br 
	0x80\-0xFD	User private
.br 
	0xFE		No audio profile specified
.br 
	0xFF		No audio required
.SH "SEE ALSO"
.LP 
MP4(3) MP4GetAudioProfileLevel(3)