Message-Id: <3.0.1.16.19971209031624.188f4cf0@main.arcticnet.no>
Date: Tue, 09 Dec 1997 03:16:24
To: Jose Luis Perandones Colino <joepc AT writeme DOT com>
From: Ove Kaaven <ovek AT arcticnet DOT no>
Subject: Re: [AL] Sound formats question
Cc: allegro AT mail DOT canvaslink DOT com, djgpp AT delorie DOT com
In-Reply-To: <3.0.32.19971208223141.00697684@195.53.80.2>
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At 22:31 08.12.97 +0100, Jose Luis Perandones Colino wrote:
>I am making AVI extension for allegro (i have make part of video), but i
>need the structures WAVEFORMATEX and PCMWAVEFORMAT, do someone help me??
>TIA.

Microsoft Platform SDK mmsystem.h

/* defines for dwFormat field of WAVEINCAPS and WAVEOUTCAPS */
#define WAVE_INVALIDFORMAT     0x00000000       /* invalid format */
#define WAVE_FORMAT_1M08       0x00000001       /* 11.025 kHz, Mono,
8-bit  */
#define WAVE_FORMAT_1S08       0x00000002       /* 11.025 kHz, Stereo,
8-bit  */
#define WAVE_FORMAT_1M16       0x00000004       /* 11.025 kHz, Mono,
16-bit */
#define WAVE_FORMAT_1S16       0x00000008       /* 11.025 kHz, Stereo,
16-bit */
#define WAVE_FORMAT_2M08       0x00000010       /* 22.05  kHz, Mono,
8-bit  */
#define WAVE_FORMAT_2S08       0x00000020       /* 22.05  kHz, Stereo,
8-bit  */
#define WAVE_FORMAT_2M16       0x00000040       /* 22.05  kHz, Mono,
16-bit */
#define WAVE_FORMAT_2S16       0x00000080       /* 22.05  kHz, Stereo,
16-bit */
#define WAVE_FORMAT_4M08       0x00000100       /* 44.1   kHz, Mono,
8-bit  */
#define WAVE_FORMAT_4S08       0x00000200       /* 44.1   kHz, Stereo,
8-bit  */
#define WAVE_FORMAT_4M16       0x00000400       /* 44.1   kHz, Mono,
16-bit */
#define WAVE_FORMAT_4S16       0x00000800       /* 44.1   kHz, Stereo,
16-bit */

/* OLD general waveform format structure (information common to all
formats) */
typedef struct waveformat_tag {
    WORD    wFormatTag;        /* format type */
    WORD    nChannels;         /* number of channels (i.e. mono, stereo,
etc.) *
    DWORD   nSamplesPerSec;    /* sample rate */
    DWORD   nAvgBytesPerSec;   /* for buffer estimation */
    WORD    nBlockAlign;       /* block size of data */
} WAVEFORMAT, *PWAVEFORMAT, NEAR *NPWAVEFORMAT, FAR *LPWAVEFORMAT;

/* flags for wFormatTag field of WAVEFORMAT */
#define WAVE_FORMAT_PCM     1

/* specific waveform format structure for PCM data */
typedef struct pcmwaveformat_tag {
    WAVEFORMAT  wf;
    WORD        wBitsPerSample;
} PCMWAVEFORMAT, *PPCMWAVEFORMAT, NEAR *NPPCMWAVEFORMAT, FAR *LPPCMWAVEFORMAT;

/*
 *  extended waveform format structure used for all non-PCM formats. this
 *  structure is common to all non-PCM formats.
 */
typedef struct tWAVEFORMATEX
{
    WORD        wFormatTag;         /* format type */
    WORD        nChannels;          /* number of channels (i.e. mono,
stereo...) */
    DWORD       nSamplesPerSec;     /* sample rate */
    DWORD       nAvgBytesPerSec;    /* for buffer estimation */
    WORD        nBlockAlign;        /* block size of data */
    WORD        wBitsPerSample;     /* number of bits per sample of mono
data */
    WORD        cbSize;             /* the count in bytes of the size of */
                                    /* extra information (after cbSize) */
} WAVEFORMATEX, *PWAVEFORMATEX, NEAR *NPWAVEFORMATEX, FAR *LPWAVEFORMATEX;
typedef const WAVEFORMATEX FAR *LPCWAVEFORMATEX;