inc/mp3_mpeg.h File Reference

Header - Mp3 file format, data. More...

#include <stddef.h>

Go to the source code of this file.

Classes
struct	mp3_frame_t
	mpeg audio frame format More...
Defines
#define	MP3_LAYER_1   3
	layer 1
#define	MP3_LAYER_2   2
	layer 2
#define	MP3_LAYER_3   1
	layer 3
#define	MP3_VER_1   3
	version 1
#define	MP3_VER_2   2
	version 2
#define	MP3_VER_2_5   0
	version 2.5
Typedefs
typedef struct mp3_frame_t	mp3_frame
	mpeg audio frame format
Functions
ptrdiff_t	mp3_next_frame (char *buffer, const size_t len)
	locate the next mpeg frame in a buffer
unsigned int	mp3_bitrate (mp3_frame *frame)
	return a mpeg audio frame bitrate
unsigned int	mp3_samplerate (mp3_frame *frame)
	return a mpeg audio frame samplerate
unsigned int	mp3_length (mp3_frame *frame, const unsigned long filesize)
	estimate the duration of an mpeg audio media using a frame and filesize

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Detailed Description

Header - Mp3 file format, data.

Author:

Julien Blitte

Version:

0.1

Definition in file mp3_mpeg.h.

---

Function Documentation

unsigned int mp3_bitrate

(

mp3_frame *

frame

)

return a mpeg audio frame bitrate

Parameters:

frame

mpeg audio frame to analyze

Returns:

the bitrate of frame

Definition at line 121 of file mp3_mpeg.c.

References bitrate_index, and check.

Referenced by mp3_length().

unsigned int mp3_length	(	mp3_frame *	frame,
		const unsigned long	filesize
	)

estimate the duration of an mpeg audio media using a frame and filesize

Parameters:

	frame	mpeg audio frame used to compute media duration
	filesize	filesize used to compute media duration

Returns:

estimated media duration

Definition at line 177 of file mp3_mpeg.c.

References check, and mp3_bitrate().

ptrdiff_t mp3_next_frame	(	char *	buffer,
		const size_t	len
	)

locate the next mpeg frame in a buffer

Parameters:

	buffer	buffer in which to locate next frame - binary
	len	size of buffer

Returns:

next frame in buffer

Definition at line 52 of file mp3_mpeg.c.

References check.

unsigned int mp3_samplerate

(

mp3_frame *

frame

)

return a mpeg audio frame samplerate

Parameters:

frame

mpeg audio frame to analyze

Returns:

the samplerate of frame

Definition at line 128 of file mp3_mpeg.c.

References check, MP3_VER_1, MP3_VER_2, MP3_VER_2_5, and samplerate_index.