mpeg-audio.h File Reference

#include <stdint.h>
#include "ws_symbol_export.h"

Go to the source code of this file.

Classes
struct	mpa

Macros
#define	MPA_UNMARSHAL_SYNC(n)   ((n) >> 21 & 0x7ff)
#define	MPA_UNMARSHAL_VERSION(n)   ((n) >> 19 & 0x3)
#define	MPA_UNMARSHAL_LAYER(n)   ((n) >> 17 & 0x3)
#define	MPA_UNMARSHAL_PROTECTION(n)   ((n) >> 16 & 0x1)
#define	MPA_UNMARSHAL_BITRATE(n)   ((n) >> 12 & 0xf)
#define	MPA_UNMARSHAL_FREQUENCY(n)   ((n) >> 10 & 0x3)
#define	MPA_UNMARSHAL_PADDING(n)   ((n) >> 9 & 0x1)
#define	MPA_UNMARSHAL_PRIVATE(n)   ((n) >> 8 & 0x1)
#define	MPA_UNMARSHAL_MODE(n)   ((n) >> 6 & 0x3)
#define	MPA_UNMARSHAL_MODEEXT(n)   ((n) >> 4 & 0x3)
#define	MPA_UNMARSHAL_COPYRIGHT(n)   ((n) >> 3 & 0x1)
#define	MPA_UNMARSHAL_ORIGINAL(n)   ((n) >> 2 & 0x1)
#define	MPA_UNMARSHAL_EMPHASIS(n)   ((n) >> 0 & 0x3)
#define	MPA_UNMARSHAL(mpa, n)
#define	MPA_DATA_BYTES(mpa)
#define	MPA_BYTES(mpa)   (MPA_DATA_BYTES(mpa) + mpa_padding(mpa))
#define	MPA_DURATION_NS(mpa)    (1000000000 / mpa_frequency(mpa) * mpa_samples(mpa))
#define	MPA_SYNC_VALID(mpa)   ((mpa)->sync == MPA_SYNC)
#define	MPA_VERSION_VALID(mpa)   (mpa_version(mpa) >= 0)
#define	MPA_LAYER_VALID(mpa)   (mpa_layer(mpa) >= 0)
#define	MPA_BITRATE_VALID(mpa)   (mpa_bitrate(mpa) > 0)
#define	MPA_FREQUENCY_VALID(mpa)   (mpa_frequency(mpa) > 0)
#define	MPA_VALID(mpa)

Enumerations
enum	{ MPA_SYNC = 0x7ff }

Functions
WS_DLL_PUBLIC int	mpa_version (const struct mpa *)
WS_DLL_PUBLIC int	mpa_layer (const struct mpa *)
WS_DLL_PUBLIC unsigned int	mpa_samples (const struct mpa *)
WS_DLL_PUBLIC unsigned int	mpa_bitrate (const struct mpa *)
WS_DLL_PUBLIC unsigned int	mpa_frequency (const struct mpa *)
WS_DLL_PUBLIC unsigned int	mpa_padding (const struct mpa *)
WS_DLL_PUBLIC uint32_t	decode_synchsafe_int (uint32_t)

Detailed Description

MPEG Audio header dissection Written by Shaun Jackman sjack.nosp@m.man@.nosp@m.gmail.nosp@m..com Copyright 2007 Shaun Jackman

Wiretap Library SPDX-License-Identifier: GPL-2.0-or-later

Macro Definition Documentation

MPA_DATA_BYTES

#define MPA_DATA_BYTES

(

mpa

)

Value:

        (mpa_bitrate(mpa) * mpa_samples(mpa) \
        / mpa_frequency(mpa) / 8)

MPA_UNMARSHAL

#define MPA_UNMARSHAL	(		mpa,
			n
	)

Value:

    do { \
    (mpa)->sync       = MPA_UNMARSHAL_SYNC(n);       \
    (mpa)->version    = MPA_UNMARSHAL_VERSION(n);    \
    (mpa)->layer      = MPA_UNMARSHAL_LAYER(n);      \
    (mpa)->protection = MPA_UNMARSHAL_PROTECTION(n); \
    (mpa)->bitrate    = MPA_UNMARSHAL_BITRATE(n);    \
    (mpa)->frequency  = MPA_UNMARSHAL_FREQUENCY(n);  \
    (mpa)->padding    = MPA_UNMARSHAL_PADDING(n);    \
    (mpa)->priv       = MPA_UNMARSHAL_PRIVATE(n);    \
    (mpa)->mode       = MPA_UNMARSHAL_MODE(n);       \
    (mpa)->modeext    = MPA_UNMARSHAL_MODEEXT(n);    \
    (mpa)->copyright  = MPA_UNMARSHAL_COPYRIGHT(n);  \
    (mpa)->original   = MPA_UNMARSHAL_ORIGINAL(n);   \
    (mpa)->emphasis   = MPA_UNMARSHAL_EMPHASIS(n);   \
    } while (0)

MPA_VALID

#define MPA_VALID

(

mpa

)

Value:

        (MPA_SYNC_VALID(mpa) \
        && MPA_VERSION_VALID(mpa) && MPA_LAYER_VALID(mpa) \
        && MPA_BITRATE_VALID(mpa) && MPA_FREQUENCY_VALID(mpa))