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MPEGLAYER3WAVEFORMAT

構造体
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サイズx64: 30 バイト / x86: 30 バイトパッキング1

サイズ=各フィールドのバイト数(x64/x86 で異なる場合は x64/x86 と併記)。x64/x86 列=フィールドのバイトオフセット(HSPで dupptr / lpoke / wpoke 等に使用)。

フィールド

フィールド型サイズx64x86説明
wfxWAVEFORMATEX18+0+0基本波形フォーマット(WAVEFORMATEX)。共通の音声属性を格納する。
wIDWORD2+18+18MP3フォーマットのID。通常はMPEGLAYER3_ID_MPEG。
fdwFlagsMPEGLAYER3WAVEFORMAT_FLAGS4+20+20ビットレート種別等のフラグ(MPEGLAYER3WAVEFORMAT_FLAGS)。
nBlockSizeWORD2+24+241ブロックのバイト数。
nFramesPerBlockWORD2+26+261ブロックに含まれるフレーム数。
nCodecDelayWORD2+28+28コーデックの遅延サンプル数。

各言語での定義

#include <windows.h>

// WAVEFORMATEX  (x64 18 / x86 18 バイト)
#pragma pack(push, 1)
typedef struct WAVEFORMATEX {
    WORD wFormatTag;
    WORD nChannels;
    DWORD nSamplesPerSec;
    DWORD nAvgBytesPerSec;
    WORD nBlockAlign;
    WORD wBitsPerSample;
    WORD cbSize;
} WAVEFORMATEX;
#pragma pack(pop)

// MPEGLAYER3WAVEFORMAT  (x64 30 / x86 30 バイト)
#pragma pack(push, 1)
typedef struct MPEGLAYER3WAVEFORMAT {
    WAVEFORMATEX wfx;
    WORD wID;
    MPEGLAYER3WAVEFORMAT_FLAGS fdwFlags;
    WORD nBlockSize;
    WORD nFramesPerBlock;
    WORD nCodecDelay;
} MPEGLAYER3WAVEFORMAT;
#pragma pack(pop)
using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Unicode)]
public struct WAVEFORMATEX
{
    public ushort wFormatTag;
    public ushort nChannels;
    public uint nSamplesPerSec;
    public uint nAvgBytesPerSec;
    public ushort nBlockAlign;
    public ushort wBitsPerSample;
    public ushort cbSize;
}

[StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Unicode)]
public struct MPEGLAYER3WAVEFORMAT
{
    public WAVEFORMATEX wfx;
    public ushort wID;
    public uint fdwFlags;
    public ushort nBlockSize;
    public ushort nFramesPerBlock;
    public ushort nCodecDelay;
}
Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, Pack:=1, CharSet:=CharSet.Unicode)>
Public Structure WAVEFORMATEX
    Public wFormatTag As UShort
    Public nChannels As UShort
    Public nSamplesPerSec As UInteger
    Public nAvgBytesPerSec As UInteger
    Public nBlockAlign As UShort
    Public wBitsPerSample As UShort
    Public cbSize As UShort
End Structure

<StructLayout(LayoutKind.Sequential, Pack:=1, CharSet:=CharSet.Unicode)>
Public Structure MPEGLAYER3WAVEFORMAT
    Public wfx As WAVEFORMATEX
    Public wID As UShort
    Public fdwFlags As UInteger
    Public nBlockSize As UShort
    Public nFramesPerBlock As UShort
    Public nCodecDelay As UShort
End Structure
import ctypes
from ctypes import wintypes

class WAVEFORMATEX(ctypes.Structure):
    _pack_ = 1
    _fields_ = [
        ("wFormatTag", ctypes.c_ushort),
        ("nChannels", ctypes.c_ushort),
        ("nSamplesPerSec", wintypes.DWORD),
        ("nAvgBytesPerSec", wintypes.DWORD),
        ("nBlockAlign", ctypes.c_ushort),
        ("wBitsPerSample", ctypes.c_ushort),
        ("cbSize", ctypes.c_ushort),
    ]

class MPEGLAYER3WAVEFORMAT(ctypes.Structure):
    _pack_ = 1
    _fields_ = [
        ("wfx", WAVEFORMATEX),
        ("wID", ctypes.c_ushort),
        ("fdwFlags", wintypes.DWORD),
        ("nBlockSize", ctypes.c_ushort),
        ("nFramesPerBlock", ctypes.c_ushort),
        ("nCodecDelay", ctypes.c_ushort),
    ]
#[repr(C, packed(1))]
pub struct WAVEFORMATEX {
    pub wFormatTag: u16,
    pub nChannels: u16,
    pub nSamplesPerSec: u32,
    pub nAvgBytesPerSec: u32,
    pub nBlockAlign: u16,
    pub wBitsPerSample: u16,
    pub cbSize: u16,
}

#[repr(C, packed(1))]
pub struct MPEGLAYER3WAVEFORMAT {
    pub wfx: WAVEFORMATEX,
    pub wID: u16,
    pub fdwFlags: u32,
    pub nBlockSize: u16,
    pub nFramesPerBlock: u16,
    pub nCodecDelay: u16,
}
import "golang.org/x/sys/windows"

type WAVEFORMATEX struct {
	wFormatTag uint16
	nChannels uint16
	nSamplesPerSec uint32
	nAvgBytesPerSec uint32
	nBlockAlign uint16
	wBitsPerSample uint16
	cbSize uint16
}

type MPEGLAYER3WAVEFORMAT struct {
	wfx WAVEFORMATEX
	wID uint16
	fdwFlags uint32
	nBlockSize uint16
	nFramesPerBlock uint16
	nCodecDelay uint16
}
type
  WAVEFORMATEX = packed record
    wFormatTag: Word;
    nChannels: Word;
    nSamplesPerSec: DWORD;
    nAvgBytesPerSec: DWORD;
    nBlockAlign: Word;
    wBitsPerSample: Word;
    cbSize: Word;
  end;

  MPEGLAYER3WAVEFORMAT = packed record
    wfx: WAVEFORMATEX;
    wID: Word;
    fdwFlags: DWORD;
    nBlockSize: Word;
    nFramesPerBlock: Word;
    nCodecDelay: Word;
  end;
const WAVEFORMATEX = extern struct {
    wFormatTag: u16,
    nChannels: u16,
    nSamplesPerSec: u32,
    nAvgBytesPerSec: u32,
    nBlockAlign: u16,
    wBitsPerSample: u16,
    cbSize: u16,
};

const MPEGLAYER3WAVEFORMAT = extern struct {
    wfx: WAVEFORMATEX,
    wID: u16,
    fdwFlags: u32,
    nBlockSize: u16,
    nFramesPerBlock: u16,
    nCodecDelay: u16,
};
type
  WAVEFORMATEX {.packed.} = object
    wFormatTag: uint16
    nChannels: uint16
    nSamplesPerSec: uint32
    nAvgBytesPerSec: uint32
    nBlockAlign: uint16
    wBitsPerSample: uint16
    cbSize: uint16

  MPEGLAYER3WAVEFORMAT {.packed.} = object
    wfx: WAVEFORMATEX
    wID: uint16
    fdwFlags: uint32
    nBlockSize: uint16
    nFramesPerBlock: uint16
    nCodecDelay: uint16
align(1)
struct WAVEFORMATEX
{
    ushort wFormatTag;
    ushort nChannels;
    uint nSamplesPerSec;
    uint nAvgBytesPerSec;
    ushort nBlockAlign;
    ushort wBitsPerSample;
    ushort cbSize;
}

align(1)
struct MPEGLAYER3WAVEFORMAT
{
    WAVEFORMATEX wfx;
    ushort wID;
    uint fdwFlags;
    ushort nBlockSize;
    ushort nFramesPerBlock;
    ushort nCodecDelay;
}

HSP用 定義

HSP3.7/3.8 は構造体機能が無いため4byte整数配列(dim)+peek/poke で操作(32/64bitでサイズ・位置が異なる場合はタブで分割)。IronHSP は NSTRUCT(#defstruct/stdim/->)で32/64bit共通。

; HSP3.7/3.8 は構造体機能が無いため、4byte整数の配列変数で操作します。(x64 レイアウト)
; MPEGLAYER3WAVEFORMAT サイズ: 30 バイト(x64)
dim st, 8    ; 4byte整数×8(構造体サイズ 30 / 4 切り上げ)
; wfx : WAVEFORMATEX (+0, 18byte)  varptr(st)+0 を基点に操作(18byte:入れ子/配列)
; wID : WORD (+18, 2byte)  wpoke st,18,値  /  値 = wpeek(st,18)
; fdwFlags : MPEGLAYER3WAVEFORMAT_FLAGS (+20, 4byte)  st.5 = 値  /  値 = st.5   (lpoke/lpeek も可)
; nBlockSize : WORD (+24, 2byte)  wpoke st,24,値  /  値 = wpeek(st,24)
; nFramesPerBlock : WORD (+26, 2byte)  wpoke st,26,値  /  値 = wpeek(st,26)
; nCodecDelay : WORD (+28, 2byte)  wpoke st,28,値  /  値 = wpeek(st,28)
; ※4byte境界の整数は添字 st.N(N=オフセット/4)で読み書き可。それ以外は peek/poke 系を使用。
; IronHSP は NSTRUCT(構造体)をサポート。32bit/64bit どちらでも同じコードで動作します。
; ※GUID・入れ子構造体はデフォルト型でないため、依存する #defstruct を先に定義(下記に同梱)。
#defstruct global WAVEFORMATEX, pack=1
    #field short wFormatTag
    #field short nChannels
    #field int nSamplesPerSec
    #field int nAvgBytesPerSec
    #field short nBlockAlign
    #field short wBitsPerSample
    #field short cbSize
#endstruct

#defstruct global MPEGLAYER3WAVEFORMAT, pack=1
    #field WAVEFORMATEX wfx
    #field short wID
    #field int fdwFlags
    #field short nBlockSize
    #field short nFramesPerBlock
    #field short nCodecDelay
#endstruct

stdim st, MPEGLAYER3WAVEFORMAT        ; NSTRUCT 変数を確保
st->wID = 100
mes "wID=" + st->wID