forked from osmocom/wireshark
96 lines
3.1 KiB
C
96 lines
3.1 KiB
C
/** @file
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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 <glib.h>
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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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WS_DLL_PUBLIC
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guint32 decode_synchsafe_int(guint32);
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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
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