/usr/include/ptlib/wince/mmsystemx.h is in libpt-1.10.10-dev 1.10.10-3.1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// (c) 2000 Yuri Kiryanov, openh323@kiryanov.com
// and Yuriy Gorvitovskiy
//
// Windows CE port of OpenH323 Open Source Project, www.openh323.org
// Missing PWLib extras
#ifndef __MMSYSTEMX_H__
#define __MMSYSTEMX_H__
#include <stdlibx.h>
#if _WIN32_WCE < 400
//
// MMSystem extras
//
#define MMIO_CREATE 0x00001000 /* create new file (or truncate file) */
#define MMIO_WRITE 0x00000001 /* open file for writing only */
#define MMIO_CREATERIFF 0x0020 /* mmioCreateChunk: make a LIST chunk */
#define MMIO_READ 0x00000000 /* open file for reading only */
#define MMIO_ALLOCBUF 0x00010000 /* mmioOpen() should allocate a buffer */
#define MMIO_FINDRIFF 0x0020 /* mmioDescend: find a LIST chunk */
#define MMIO_FINDCHUNK 0x0010 /* mmioDescend: find a chunk by ID */
typedef DWORD FOURCC;
typedef char * HPSTR; /* a huge version of LPSTR */
typedef LRESULT (CALLBACK MMIOPROC)(LPSTR lpmmioinfo, UINT uMsg,
LPARAM lParam1, LPARAM lParam2);
typedef MMIOPROC FAR *LPMMIOPROC;
/* general MMIO information data structure */
typedef struct _MMIOINFO
{
/* general fields */
DWORD dwFlags; /* general status flags */
FOURCC fccIOProc; /* pointer to I/O procedure */
LPMMIOPROC pIOProc; /* pointer to I/O procedure */
UINT wErrorRet; /* place for error to be returned */
HTASK htask; /* alternate local task */
/* fields maintained by MMIO functions during buffered I/O */
LONG cchBuffer; /* size of I/O buffer (or 0L) */
HPSTR pchBuffer; /* start of I/O buffer (or NULL) */
HPSTR pchNext; /* pointer to next byte to read/write */
HPSTR pchEndRead; /* pointer to last valid byte to read */
HPSTR pchEndWrite; /* pointer to last byte to write */
LONG lBufOffset; /* disk offset of start of buffer */
/* fields maintained by I/O procedure */
LONG lDiskOffset; /* disk offset of next read or write */
DWORD adwInfo[3]; /* data specific to type of MMIOPROC */
/* other fields maintained by MMIO */
DWORD dwReserved1; /* reserved for MMIO use */
DWORD dwReserved2; /* reserved for MMIO use */
HMMIO hmmio; /* handle to open file */
} MMIOINFO, *PMMIOINFO, NEAR *NPMMIOINFO, FAR *LPMMIOINFO;
typedef const MMIOINFO FAR *LPCMMIOINFO;
typedef struct _MMCKINFO
{
FOURCC ckid;
DWORD cksize;
FOURCC fccType;
DWORD dwDataOffset;
DWORD dwFlags;
} MMCKINFO, *PMMCKINFO, NEAR *NPMMCKINFO, FAR *LPMMCKINFO;
typedef const MMCKINFO *LPCMMCKINFO;
#ifndef HMMIO
typedef HANDLE HMMIO; // a handle to an open file
#endif
#endif // _INC_MMSYSTEM
HMMIO WINAPI mmioOpen(LPSTR pszFileName, LPMMIOINFO pmmioinfo, DWORD fdwOpen);
MMRESULT WINAPI mmioClose(HMMIO hmmio, UINT fuClose);
LONG WINAPI mmioRead(HMMIO hmmio, HPSTR pch, LONG cch);
LONG WINAPI mmioWrite(HMMIO hmmio, const char * pch, LONG cch);
MMRESULT WINAPI mmioDescend(HMMIO hmmio, LPMMCKINFO pmmcki,
const MMCKINFO FAR* pmmckiParent, UINT fuDescend);
MMRESULT WINAPI mmioAscend(HMMIO hmmio, LPMMCKINFO pmmcki, UINT fuAscend);
MMRESULT WINAPI mmioCreateChunk(HMMIO hmmio, LPMMCKINFO pmmcki, UINT fuCreate);
BOOL WINAPI PlaySound( LPCSTR pszSound, HMODULE hmod, DWORD fdwSound);
MMRESULT WINAPI waveInGetErrorText(MMRESULT mmrError, char* pszText, UINT cchText);
MMRESULT WINAPI waveOutGetErrorText(MMRESULT mmrError, char* pszText, UINT cchText);
#endif // __MMSYSTEMX_H__
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