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wsutil
mpeg-audio.h
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/* mpeg-audio.h
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*
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* MPEG Audio header dissection
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* Written by Shaun Jackman <sjackman@gmail.com>
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* Copyright 2007 Shaun Jackman
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*
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* Wiretap Library
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef MPA_H
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#define MPA_H 1
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#include "ws_symbol_export.h"
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struct
mpa
{
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unsigned
int
emphasis :2;
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unsigned
int
original :1;
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unsigned
int
copyright :1;
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unsigned
int
modeext :2;
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unsigned
int
mode :2;
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unsigned
int
priv :1;
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unsigned
int
padding :1;
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unsigned
int
frequency :2;
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unsigned
int
bitrate :4;
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unsigned
int
protection :1;
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unsigned
int
layer :2;
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unsigned
int
version :2;
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unsigned
int
sync :11;
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};
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#define MPA_UNMARSHAL_SYNC(n) ((n) >> 21 & 0x7ff)
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#define MPA_UNMARSHAL_VERSION(n) ((n) >> 19 & 0x3)
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#define MPA_UNMARSHAL_LAYER(n) ((n) >> 17 & 0x3)
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#define MPA_UNMARSHAL_PROTECTION(n) ((n) >> 16 & 0x1)
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#define MPA_UNMARSHAL_BITRATE(n) ((n) >> 12 & 0xf)
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#define MPA_UNMARSHAL_FREQUENCY(n) ((n) >> 10 & 0x3)
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#define MPA_UNMARSHAL_PADDING(n) ((n) >> 9 & 0x1)
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#define MPA_UNMARSHAL_PRIVATE(n) ((n) >> 8 & 0x1)
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#define MPA_UNMARSHAL_MODE(n) ((n) >> 6 & 0x3)
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#define MPA_UNMARSHAL_MODEEXT(n) ((n) >> 4 & 0x3)
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#define MPA_UNMARSHAL_COPYRIGHT(n) ((n) >> 3 & 0x1)
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#define MPA_UNMARSHAL_ORIGINAL(n) ((n) >> 2 & 0x1)
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#define MPA_UNMARSHAL_EMPHASIS(n) ((n) >> 0 & 0x3)
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#define MPA_UNMARSHAL(mpa, n) do { \
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(mpa)->sync = MPA_UNMARSHAL_SYNC(n); \
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(mpa)->version = MPA_UNMARSHAL_VERSION(n); \
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(mpa)->layer = MPA_UNMARSHAL_LAYER(n); \
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(mpa)->protection = MPA_UNMARSHAL_PROTECTION(n); \
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(mpa)->bitrate = MPA_UNMARSHAL_BITRATE(n); \
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(mpa)->frequency = MPA_UNMARSHAL_FREQUENCY(n); \
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(mpa)->padding = MPA_UNMARSHAL_PADDING(n); \
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(mpa)->priv = MPA_UNMARSHAL_PRIVATE(n); \
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(mpa)->mode = MPA_UNMARSHAL_MODE(n); \
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(mpa)->modeext = MPA_UNMARSHAL_MODEEXT(n); \
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(mpa)->copyright = MPA_UNMARSHAL_COPYRIGHT(n); \
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(mpa)->original = MPA_UNMARSHAL_ORIGINAL(n); \
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(mpa)->emphasis = MPA_UNMARSHAL_EMPHASIS(n); \
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} while (0)
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WS_DLL_PUBLIC
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int
mpa_version(
const
struct
mpa
*);
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WS_DLL_PUBLIC
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int
mpa_layer(
const
struct
mpa
*);
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WS_DLL_PUBLIC
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unsigned
int
mpa_samples(
const
struct
mpa
*);
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WS_DLL_PUBLIC
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unsigned
int
mpa_bitrate(
const
struct
mpa
*);
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WS_DLL_PUBLIC
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unsigned
int
mpa_frequency(
const
struct
mpa
*);
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WS_DLL_PUBLIC
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unsigned
int
mpa_padding(
const
struct
mpa
*);
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#define MPA_DATA_BYTES(mpa) (mpa_bitrate(mpa) * mpa_samples(mpa) \
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/ mpa_frequency(mpa) / 8)
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#define MPA_BYTES(mpa) (MPA_DATA_BYTES(mpa) + mpa_padding(mpa))
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#define MPA_DURATION_NS(mpa) \
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(1000000000 / mpa_frequency(mpa) * mpa_samples(mpa))
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enum
{ MPA_SYNC = 0x7ff };
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#define MPA_SYNC_VALID(mpa) ((mpa)->sync == MPA_SYNC)
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#define MPA_VERSION_VALID(mpa) (mpa_version(mpa) >= 0)
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#define MPA_LAYER_VALID(mpa) (mpa_layer(mpa) >= 0)
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#define MPA_BITRATE_VALID(mpa) (mpa_bitrate(mpa) > 0)
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#define MPA_FREQUENCY_VALID(mpa) (mpa_frequency(mpa) > 0)
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#define MPA_VALID(mpa) (MPA_SYNC_VALID(mpa) \
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&& MPA_VERSION_VALID(mpa) && MPA_LAYER_VALID(mpa) \
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&& MPA_BITRATE_VALID(mpa) && MPA_FREQUENCY_VALID(mpa))
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#endif
mpa
Definition:
mpeg-audio.h:16
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