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/* -*- tab-width: 8; c-basic-offset: 4 -*- */

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/*
 *      MSACM32 library
 *
 *      Copyright 1998  Patrik Stridvall
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 *		  1999	Eric Pouech
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 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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 */

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#include <stdarg.h>
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#include <string.h>

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#include "windef.h"
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#include "winbase.h"
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#include "wingdi.h"
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#include "winuser.h"
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#include "winerror.h"
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#include "winreg.h"
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#include "mmsystem.h"
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#include "mmreg.h"
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#include "msacm.h"
#include "msacmdrv.h"
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#include "wineacm.h"
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#include "wine/debug.h"
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#include "wine/unicode.h"
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WINE_DEFAULT_DEBUG_CHANNEL(msacm);
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/**********************************************************************/

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HANDLE MSACM_hHeap = NULL;
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PWINE_ACMDRIVERID MSACM_pFirstACMDriverID = NULL;
PWINE_ACMDRIVERID MSACM_pLastACMDriverID = NULL;
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static DWORD MSACM_suspendBroadcastCount = 0;
static BOOL MSACM_pendingBroadcast = FALSE;
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static PWINE_ACMNOTIFYWND MSACM_pFirstACMNotifyWnd = NULL;
static PWINE_ACMNOTIFYWND MSACM_pLastACMNotifyWnd = NULL;
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static void MSACM_ReorderDriversByPriority(void);

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/***********************************************************************
 *           MSACM_RegisterDriverFromRegistry()
 */
PWINE_ACMDRIVERID MSACM_RegisterDriverFromRegistry(LPCWSTR pszRegEntry)
{
    static const WCHAR msacmW[] = {'M','S','A','C','M','.'};
    static const WCHAR drvkey[] = {'S','o','f','t','w','a','r','e','\\',
				   'M','i','c','r','o','s','o','f','t','\\',
				   'W','i','n','d','o','w','s',' ','N','T','\\',
				   'C','u','r','r','e','n','t','V','e','r','s','i','o','n','\\',
				   'D','r','i','v','e','r','s','3','2','\0'};
    WCHAR buf[2048];
    DWORD bufLen, lRet;
    HKEY hKey;
    PWINE_ACMDRIVERID padid = NULL;
    
    /* The requested registry entry must have the format msacm.XXXXX in order to
       be recognized in any future sessions of msacm
     */
    if (0 == strncmpiW(buf, msacmW, sizeof(msacmW)/sizeof(WCHAR))) {
        lRet = RegOpenKeyExW(HKEY_LOCAL_MACHINE, drvkey, 0, KEY_QUERY_VALUE, &hKey);
        if (lRet != ERROR_SUCCESS) {
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            WARN("unable to open registry key - 0x%08x\n", lRet);
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        } else {
            bufLen = sizeof(buf);
            lRet = RegQueryValueExW(hKey, pszRegEntry, NULL, NULL, (LPBYTE)buf, &bufLen);
            if (lRet != ERROR_SUCCESS) {
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                WARN("unable to query requested subkey %s - 0x%08x\n", debugstr_w(pszRegEntry), lRet);
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            } else {
                MSACM_RegisterDriver(pszRegEntry, buf, 0);
            }
            RegCloseKey( hKey );
        }
    }
    return padid;
}

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#if 0
/***********************************************************************
 *           MSACM_DumpCache
 */
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static	void MSACM_DumpCache(PWINE_ACMDRIVERID padid)
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{
    unsigned 	i;

    TRACE("cFilterTags=%lu cFormatTags=%lu fdwSupport=%08lx\n",
	  padid->cFilterTags, padid->cFormatTags, padid->fdwSupport);
    for (i = 0; i < padid->cache->cFormatTags; i++) {
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	TRACE("\tdwFormatTag=%lu cbwfx=%lu\n",
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	      padid->aFormatTag[i].dwFormatTag, padid->aFormatTag[i].cbwfx);
    }
}
#endif

/***********************************************************************
 *           MSACM_FindFormatTagInCache 		[internal]
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 *
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 *	Returns TRUE is the format tag fmtTag is present in the cache.
 *	If so, idx is set to its index.
 */
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BOOL MSACM_FindFormatTagInCache(const WINE_ACMDRIVERID* padid, DWORD fmtTag, LPDWORD idx)
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{
    unsigned 	i;

    for (i = 0; i < padid->cFormatTags; i++) {
	if (padid->aFormatTag[i].dwFormatTag == fmtTag) {
	    if (idx) *idx = i;
	    return TRUE;
	}
    }
    return FALSE;
}

/***********************************************************************
 *           MSACM_FillCache
 */
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static BOOL MSACM_FillCache(PWINE_ACMDRIVERID padid)
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{
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    HACMDRIVER		        had = 0;
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    unsigned int		        ntag;
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    ACMDRIVERDETAILSW	        add;
    ACMFORMATTAGDETAILSW        aftd;
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    if (acmDriverOpen(&had, (HACMDRIVERID)padid, 0) != 0)
	return FALSE;

    padid->aFormatTag = NULL;
    add.cbStruct = sizeof(add);
    if (MSACM_Message(had, ACMDM_DRIVER_DETAILS, (LPARAM)&add,  0))
	goto errCleanUp;

    if (add.cFormatTags > 0) {
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	padid->aFormatTag = HeapAlloc(MSACM_hHeap, HEAP_ZERO_MEMORY,
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				      add.cFormatTags * sizeof(padid->aFormatTag[0]));
	if (!padid->aFormatTag) goto errCleanUp;
    }

    padid->cFormatTags = add.cFormatTags;
    padid->cFilterTags = add.cFilterTags;
    padid->fdwSupport  = add.fdwSupport;

    aftd.cbStruct = sizeof(aftd);
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    for (ntag = 0; ntag < add.cFormatTags; ntag++) {
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	aftd.dwFormatTagIndex = ntag;
	if (MSACM_Message(had, ACMDM_FORMATTAG_DETAILS, (LPARAM)&aftd, ACM_FORMATTAGDETAILSF_INDEX)) {
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	    TRACE("IIOs (%s)\n", debugstr_w(padid->pszDriverAlias));
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	    goto errCleanUp;
	}
	padid->aFormatTag[ntag].dwFormatTag = aftd.dwFormatTag;
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	padid->aFormatTag[ntag].cbwfx = aftd.cbFormatSize;
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    }
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    acmDriverClose(had, 0);

    return TRUE;

errCleanUp:
    if (had) acmDriverClose(had, 0);
    HeapFree(MSACM_hHeap, 0, padid->aFormatTag);
    padid->aFormatTag = NULL;
    return FALSE;
}

/***********************************************************************
 *           MSACM_GetRegistryKey
 */
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static	LPWSTR	MSACM_GetRegistryKey(const WINE_ACMDRIVERID* padid)
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{
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    static const WCHAR	baseKey[] = {'S','o','f','t','w','a','r','e','\\','M','i','c','r','o','s','o','f','t','\\',
                                     'A','u','d','i','o','C','o','m','p','r','e','s','s','i','o','n','M','a','n','a','g','e','r','\\',
                                     'D','r','i','v','e','r','C','a','c','h','e','\\','\0'};
    LPWSTR	ret;
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    int		len;

    if (!padid->pszDriverAlias) {
	ERR("No alias needed for registry entry\n");
	return NULL;
    }
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    len = strlenW(baseKey);
    ret = HeapAlloc(MSACM_hHeap, 0, (len + strlenW(padid->pszDriverAlias) + 1) * sizeof(WCHAR));
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    if (!ret) return NULL;

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    strcpyW(ret, baseKey);
    strcpyW(ret + len, padid->pszDriverAlias);
    CharLowerW(ret + len);
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    return ret;
}

/***********************************************************************
 *           MSACM_ReadCache
 */
static BOOL MSACM_ReadCache(PWINE_ACMDRIVERID padid)
{
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    LPWSTR	key = MSACM_GetRegistryKey(padid);
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    HKEY	hKey;
    DWORD	type, size;

    if (!key) return FALSE;

    padid->aFormatTag = NULL;

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    if (RegCreateKeyW(HKEY_LOCAL_MACHINE, key, &hKey))
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	goto errCleanUp;

    size = sizeof(padid->cFormatTags);
    if (RegQueryValueExA(hKey, "cFormatTags", 0, &type, (void*)&padid->cFormatTags, &size))
	goto errCleanUp;
    size = sizeof(padid->cFilterTags);
    if (RegQueryValueExA(hKey, "cFilterTags", 0, &type, (void*)&padid->cFilterTags, &size))
	goto errCleanUp;
    size = sizeof(padid->fdwSupport);
    if (RegQueryValueExA(hKey, "fdwSupport", 0, &type, (void*)&padid->fdwSupport, &size))
	goto errCleanUp;

    if (padid->cFormatTags > 0) {
	size = padid->cFormatTags * sizeof(padid->aFormatTag[0]);
	padid->aFormatTag = HeapAlloc(MSACM_hHeap, HEAP_ZERO_MEMORY, size);
	if (!padid->aFormatTag) goto errCleanUp;
	if (RegQueryValueExA(hKey, "aFormatTagCache", 0, &type, (void*)padid->aFormatTag, &size))
	    goto errCleanUp;
    }
    HeapFree(MSACM_hHeap, 0, key);
    return TRUE;

 errCleanUp:
    HeapFree(MSACM_hHeap, 0, key);
    HeapFree(MSACM_hHeap, 0, padid->aFormatTag);
    padid->aFormatTag = NULL;
    RegCloseKey(hKey);
    return FALSE;
}

/***********************************************************************
 *           MSACM_WriteCache
 */
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static	BOOL MSACM_WriteCache(const WINE_ACMDRIVERID *padid)
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{
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    LPWSTR	key = MSACM_GetRegistryKey(padid);
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    HKEY	hKey;

    if (!key) return FALSE;

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    if (RegCreateKeyW(HKEY_LOCAL_MACHINE, key, &hKey))
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	goto errCleanUp;

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    if (RegSetValueExA(hKey, "cFormatTags", 0, REG_DWORD, (const void*)&padid->cFormatTags, sizeof(DWORD)))
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	goto errCleanUp;
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    if (RegSetValueExA(hKey, "cFilterTags", 0, REG_DWORD, (const void*)&padid->cFilterTags, sizeof(DWORD)))
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	goto errCleanUp;
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    if (RegSetValueExA(hKey, "fdwSupport", 0, REG_DWORD, (const void*)&padid->fdwSupport, sizeof(DWORD)))
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	goto errCleanUp;
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    if (RegSetValueExA(hKey, "aFormatTagCache", 0, REG_BINARY,
		       (void*)padid->aFormatTag,
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		       padid->cFormatTags * sizeof(padid->aFormatTag[0])))
	goto errCleanUp;
    HeapFree(MSACM_hHeap, 0, key);
    return TRUE;

 errCleanUp:
    HeapFree(MSACM_hHeap, 0, key);
    return FALSE;
}

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/***********************************************************************
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 *           MSACM_RegisterDriver()
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 */
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PWINE_ACMDRIVERID MSACM_RegisterDriver(LPCWSTR pszDriverAlias, LPCWSTR pszFileName,
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				       PWINE_ACMLOCALDRIVER pLocalDriver)
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{
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    PWINE_ACMDRIVERID	padid;
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    TRACE("(%s, %s, %p)\n", 
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          debugstr_w(pszDriverAlias), debugstr_w(pszFileName), pLocalDriver);
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    padid = HeapAlloc(MSACM_hHeap, 0, sizeof(WINE_ACMDRIVERID));
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    padid->obj.dwType = WINE_ACMOBJ_DRIVERID;
    padid->obj.pACMDriverID = padid;
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    padid->pszDriverAlias = NULL;
    if (pszDriverAlias)
    {
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        padid->pszDriverAlias = HeapAlloc( MSACM_hHeap, 0, (strlenW(pszDriverAlias)+1) * sizeof(WCHAR) );
        strcpyW( padid->pszDriverAlias, pszDriverAlias );
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    }
    padid->pszFileName = NULL;
    if (pszFileName)
    {
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        padid->pszFileName = HeapAlloc( MSACM_hHeap, 0, (strlenW(pszFileName)+1) * sizeof(WCHAR) );
        strcpyW( padid->pszFileName, pszFileName );
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    }
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    padid->pLocalDriver = pLocalDriver;
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    padid->pACMDriverList = NULL;
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    if (pLocalDriver) {
        padid->pPrevACMDriverID = NULL;
        padid->pNextACMDriverID = MSACM_pFirstACMDriverID;
        if (MSACM_pFirstACMDriverID)
            MSACM_pFirstACMDriverID->pPrevACMDriverID = padid;
        MSACM_pFirstACMDriverID = padid;
        if (!MSACM_pLastACMDriverID)
            MSACM_pLastACMDriverID = padid;
    } else {
        padid->pNextACMDriverID = NULL;
        padid->pPrevACMDriverID = MSACM_pLastACMDriverID;
        if (MSACM_pLastACMDriverID)
	    MSACM_pLastACMDriverID->pNextACMDriverID = padid;
        MSACM_pLastACMDriverID = padid;
        if (!MSACM_pFirstACMDriverID)
	    MSACM_pFirstACMDriverID = padid;
    }
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    /* disable the driver if we cannot load the cache */
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    if ((!padid->pszDriverAlias || !MSACM_ReadCache(padid)) && !MSACM_FillCache(padid)) {
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	WARN("Couldn't load cache for ACM driver (%s)\n", debugstr_w(pszFileName));
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	MSACM_UnregisterDriver(padid);
	return NULL;
    }
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    if (pLocalDriver) padid->fdwSupport |= ACMDRIVERDETAILS_SUPPORTF_LOCAL;
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    return padid;
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}

/***********************************************************************
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 *           MSACM_RegisterAllDrivers()
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 */
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void MSACM_RegisterAllDrivers(void)
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{
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    static const WCHAR msacm32[] = {'m','s','a','c','m','3','2','.','d','l','l','\0'};
    static const WCHAR msacmW[] = {'M','S','A','C','M','.'};
    static const WCHAR drv32[] = {'d','r','i','v','e','r','s','3','2','\0'};
    static const WCHAR sys[] = {'s','y','s','t','e','m','.','i','n','i','\0'};
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    static const WCHAR drvkey[] = {'S','o','f','t','w','a','r','e','\\',
				   'M','i','c','r','o','s','o','f','t','\\',
				   'W','i','n','d','o','w','s',' ','N','T','\\',
				   'C','u','r','r','e','n','t','V','e','r','s','i','o','n','\\',
				   'D','r','i','v','e','r','s','3','2','\0'};
    DWORD i, cnt = 0, bufLen, lRet;
    WCHAR buf[2048], *name, *s;
    FILETIME lastWrite;
    HKEY hKey;

    /* FIXME: What if the user edits system.ini while the program is running?
     * Does Windows handle that?  */
    if (MSACM_pFirstACMDriverID) return;

    lRet = RegOpenKeyExW(HKEY_LOCAL_MACHINE, drvkey, 0, KEY_QUERY_VALUE, &hKey);
    if (lRet == ERROR_SUCCESS) {
	RegQueryInfoKeyW( hKey, 0, 0, 0, &cnt, 0, 0, 0, 0, 0, 0, 0);
	for (i = 0; i < cnt; i++) {
	    bufLen = sizeof(buf) / sizeof(buf[0]);
	    lRet = RegEnumKeyExW(hKey, i, buf, &bufLen, 0, 0, 0, &lastWrite);
	    if (lRet != ERROR_SUCCESS) continue;
	    if (strncmpiW(buf, msacmW, sizeof(msacmW)/sizeof(msacmW[0]))) continue;
	    if (!(name = strchrW(buf, '='))) continue;
	    *name = 0;
	    MSACM_RegisterDriver(buf, name + 1, 0);
	}
    	RegCloseKey( hKey );
    }
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    if (GetPrivateProfileSectionW(drv32, buf, sizeof(buf)/sizeof(buf[0]), sys))
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    {
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	for(s = buf; *s;  s += strlenW(s) + 1)
	{
	    if (strncmpiW(s, msacmW, sizeof(msacmW)/sizeof(msacmW[0]))) continue;
	    if (!(name = strchrW(s, '='))) continue;
	    *name = 0;
	    MSACM_RegisterDriver(s, name + 1, 0);
	    *name = '=';
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	}
    }
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    MSACM_ReorderDriversByPriority();
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    MSACM_RegisterDriver(msacm32, msacm32, 0);
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}

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/***********************************************************************
 *           MSACM_RegisterNotificationWindow()
 */
PWINE_ACMNOTIFYWND MSACM_RegisterNotificationWindow(HWND hNotifyWnd, DWORD dwNotifyMsg)
{
    PWINE_ACMNOTIFYWND	panwnd;

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    TRACE("(%p,0x%08x)\n", hNotifyWnd, dwNotifyMsg);
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    panwnd = HeapAlloc(MSACM_hHeap, 0, sizeof(WINE_ACMNOTIFYWND));
    panwnd->obj.dwType = WINE_ACMOBJ_NOTIFYWND;
    panwnd->obj.pACMDriverID = 0;
    panwnd->hNotifyWnd = hNotifyWnd;
    panwnd->dwNotifyMsg = dwNotifyMsg;
    panwnd->fdwSupport = 0;
    
    panwnd->pNextACMNotifyWnd = NULL;
    panwnd->pPrevACMNotifyWnd = MSACM_pLastACMNotifyWnd;
    if (MSACM_pLastACMNotifyWnd)
        MSACM_pLastACMNotifyWnd->pNextACMNotifyWnd = panwnd;
    MSACM_pLastACMNotifyWnd = panwnd;
    if (!MSACM_pFirstACMNotifyWnd)
        MSACM_pFirstACMNotifyWnd = panwnd;

    return panwnd;
}

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/***********************************************************************
 *           MSACM_BroadcastNotification()
 */
void MSACM_BroadcastNotification(void)
{
    if (MSACM_suspendBroadcastCount <= 0) {
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        PWINE_ACMNOTIFYWND panwnd;

        for (panwnd = MSACM_pFirstACMNotifyWnd; panwnd; panwnd = panwnd->pNextACMNotifyWnd) 
        if (!(panwnd->fdwSupport & ACMDRIVERDETAILS_SUPPORTF_DISABLED))
            SendMessageW(panwnd->hNotifyWnd, panwnd->dwNotifyMsg, 0, 0);
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    } else {
        MSACM_pendingBroadcast = TRUE;
    }
}

/***********************************************************************
 *           MSACM_DisableNotifications()
 */
void MSACM_DisableNotifications(void)
{
    MSACM_suspendBroadcastCount++;
}

/***********************************************************************
 *           MSACM_EnableNotifications()
 */
void MSACM_EnableNotifications(void)
{
    if (MSACM_suspendBroadcastCount > 0) {
        MSACM_suspendBroadcastCount--;
        if (MSACM_suspendBroadcastCount == 0 && MSACM_pendingBroadcast) {
            MSACM_pendingBroadcast = FALSE;
            MSACM_BroadcastNotification();
        }
    }
}

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/***********************************************************************
 *           MSACM_UnRegisterNotificationWindow()
 */
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PWINE_ACMNOTIFYWND MSACM_UnRegisterNotificationWindow(const WINE_ACMNOTIFYWND *panwnd)
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{
    PWINE_ACMNOTIFYWND p;

    for (p = MSACM_pFirstACMNotifyWnd; p; p = p->pNextACMNotifyWnd) {
        if (p == panwnd) {
            PWINE_ACMNOTIFYWND pNext = p->pNextACMNotifyWnd;

            if (p->pPrevACMNotifyWnd) p->pPrevACMNotifyWnd->pNextACMNotifyWnd = p->pNextACMNotifyWnd;
            if (p->pNextACMNotifyWnd) p->pNextACMNotifyWnd->pPrevACMNotifyWnd = p->pPrevACMNotifyWnd;
            if (MSACM_pFirstACMNotifyWnd == p) MSACM_pFirstACMNotifyWnd = p->pNextACMNotifyWnd;
            if (MSACM_pLastACMNotifyWnd == p) MSACM_pLastACMNotifyWnd = p->pPrevACMNotifyWnd;
            HeapFree(MSACM_hHeap, 0, p);
            
            return pNext;
        }
    }
    return NULL;
}

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/***********************************************************************
 *           MSACM_RePositionDriver()
 */
void MSACM_RePositionDriver(PWINE_ACMDRIVERID padid, DWORD dwPriority)
{
    PWINE_ACMDRIVERID pTargetPosition = NULL;
                
    /* Remove selected driver from linked list */
    if (MSACM_pFirstACMDriverID == padid) {
        MSACM_pFirstACMDriverID = padid->pNextACMDriverID;
    }
    if (MSACM_pLastACMDriverID == padid) {
        MSACM_pLastACMDriverID = padid->pPrevACMDriverID;
    }
    if (padid->pPrevACMDriverID != NULL) {
        padid->pPrevACMDriverID->pNextACMDriverID = padid->pNextACMDriverID;
    }
    if (padid->pNextACMDriverID != NULL) {
        padid->pNextACMDriverID->pPrevACMDriverID = padid->pPrevACMDriverID;
    }
    
    /* Look up position where selected driver should be */
    if (dwPriority == 1) {
        pTargetPosition = padid->pPrevACMDriverID;
        while (pTargetPosition->pPrevACMDriverID != NULL &&
            !(pTargetPosition->pPrevACMDriverID->fdwSupport & ACMDRIVERDETAILS_SUPPORTF_LOCAL)) {
            pTargetPosition = pTargetPosition->pPrevACMDriverID;
        }
    } else if (dwPriority == -1) {
        pTargetPosition = padid->pNextACMDriverID;
        while (pTargetPosition->pNextACMDriverID != NULL) {
            pTargetPosition = pTargetPosition->pNextACMDriverID;
        }
    }
    
    /* Place selected driver in selected position */
    padid->pPrevACMDriverID = pTargetPosition->pPrevACMDriverID;
    padid->pNextACMDriverID = pTargetPosition;
    if (padid->pPrevACMDriverID != NULL) {
        padid->pPrevACMDriverID->pNextACMDriverID = padid;
    } else {
        MSACM_pFirstACMDriverID = padid;
    }
    if (padid->pNextACMDriverID != NULL) {
        padid->pNextACMDriverID->pPrevACMDriverID = padid;
    } else {
        MSACM_pLastACMDriverID = padid;
    }
}

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/***********************************************************************
 *           MSACM_ReorderDriversByPriority()
 * Reorders all drivers based on the priority list indicated by the registry key:
 * HKCU\\Software\\Microsoft\\Multimedia\\Audio Compression Manager\\Priority v4.00
 */
static void MSACM_ReorderDriversByPriority(void)
{
    PWINE_ACMDRIVERID	padid;
    unsigned int iNumDrivers;
    PWINE_ACMDRIVERID * driverList = NULL;
    HKEY hPriorityKey = NULL;
    
    TRACE("\n");
    
    /* Count drivers && alloc corresponding memory for list */
    iNumDrivers = 0;
    for (padid = MSACM_pFirstACMDriverID; padid; padid = padid->pNextACMDriverID) iNumDrivers++;
    if (iNumDrivers > 1)
    {
        LONG lError;
        static const WCHAR basePriorityKey[] = {
            'S','o','f','t','w','a','r','e','\\',
            'M','i','c','r','o','s','o','f','t','\\',
            'M','u','l','t','i','m','e','d','i','a','\\',
            'A','u','d','i','o',' ','C','o','m','p','r','e','s','s','i','o','n',' ','M','a','n','a','g','e','r','\\',
            'P','r','i','o','r','i','t','y',' ','v','4','.','0','0','\0'
        };
        unsigned int i;
        LONG lBufferLength;
        WCHAR szBuffer[256];
        
        driverList = HeapAlloc(MSACM_hHeap, 0, iNumDrivers * sizeof(PWINE_ACMDRIVERID));
        if (!driverList)
        {
            ERR("out of memory\n");
            goto errCleanUp;
        }

        lError = RegOpenKeyW(HKEY_CURRENT_USER, basePriorityKey, &hPriorityKey);
        if (lError != ERROR_SUCCESS) {
            TRACE("RegOpenKeyW failed, possibly key does not exist yet\n");
            hPriorityKey = NULL;
            goto errCleanUp;
        } 
            
        /* Copy drivers into list to simplify linked list modification */
        for (i = 0, padid = MSACM_pFirstACMDriverID; padid; padid = padid->pNextACMDriverID, i++)
        {
            driverList[i] = padid;
        }

        /* Query each of the priorities in turn. Alias key is in lowercase. 
            The general form of the priority record is the following:
            "PriorityN" --> "1, msacm.driveralias"
            where N is an integer, and the value is a string of the driver
            alias, prefixed by "1, " for an enabled driver, or "0, " for a
            disabled driver.
            */
        for (i = 0; i < iNumDrivers; i++)
        {
            static const WCHAR priorityTmpl[] = {'P','r','i','o','r','i','t','y','%','l','d','\0'};
            WCHAR szSubKey[17];
            unsigned int iTargetPosition;
            unsigned int iCurrentPosition;
            WCHAR * pAlias;
            static const WCHAR sPrefix[] = {'m','s','a','c','m','.','\0'};
            
            /* Build expected entry name */
            snprintfW(szSubKey, 17, priorityTmpl, i + 1);
            lBufferLength = sizeof(szBuffer);
            lError = RegQueryValueExW(hPriorityKey, szSubKey, NULL, NULL, (LPBYTE)szBuffer, (LPDWORD)&lBufferLength);
            if (lError != ERROR_SUCCESS) continue;

            /* Recovered driver alias should be at this position */
            iTargetPosition = i;
            
            /* Locate driver alias in driver list */
            pAlias = strstrW(szBuffer, sPrefix);
            if (pAlias == NULL) continue;
            
            for (iCurrentPosition = 0; iCurrentPosition < iNumDrivers; iCurrentPosition++) {
                if (strcmpiW(driverList[iCurrentPosition]->pszDriverAlias, pAlias) == 0) 
                    break;
            }
            if (iCurrentPosition < iNumDrivers && iTargetPosition != iCurrentPosition) {
                padid = driverList[iTargetPosition];
                driverList[iTargetPosition] = driverList[iCurrentPosition];
                driverList[iCurrentPosition] = padid;

                /* Locate enabled status */
                if (szBuffer[0] == '1') {
                    driverList[iTargetPosition]->fdwSupport &= ~ACMDRIVERDETAILS_SUPPORTF_DISABLED;
                } else if (szBuffer[0] == '0') {
                    driverList[iTargetPosition]->fdwSupport |= ACMDRIVERDETAILS_SUPPORTF_DISABLED;
                }
            }
        }
        
        /* Re-assign pointers so that linked list traverses the ordered array */
        for (i = 0; i < iNumDrivers; i++) {
            driverList[i]->pPrevACMDriverID = (i > 0) ? driverList[i - 1] : NULL;
            driverList[i]->pNextACMDriverID = (i < iNumDrivers - 1) ? driverList[i + 1] : NULL;
        }
        MSACM_pFirstACMDriverID = driverList[0];
        MSACM_pLastACMDriverID = driverList[iNumDrivers - 1];
    }
    
errCleanUp:
    if (hPriorityKey != NULL) RegCloseKey(hPriorityKey);
638
    HeapFree(MSACM_hHeap, 0, driverList);
639 640
}

641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667
/***********************************************************************
 *           MSACM_WriteCurrentPriorities()
 * Writes out current order of driver priorities to registry key:
 * HKCU\\Software\\Microsoft\\Multimedia\\Audio Compression Manager\\Priority v4.00
 */
void MSACM_WriteCurrentPriorities(void)
{
    LONG lError;
    HKEY hPriorityKey;
    static const WCHAR basePriorityKey[] = {
        'S','o','f','t','w','a','r','e','\\',
        'M','i','c','r','o','s','o','f','t','\\',
        'M','u','l','t','i','m','e','d','i','a','\\',
        'A','u','d','i','o',' ','C','o','m','p','r','e','s','s','i','o','n',' ','M','a','n','a','g','e','r','\\',
        'P','r','i','o','r','i','t','y',' ','v','4','.','0','0','\0'
    };
    PWINE_ACMDRIVERID padid;
    DWORD dwPriorityCounter;
    static const WCHAR priorityTmpl[] = {'P','r','i','o','r','i','t','y','%','l','d','\0'};
    static const WCHAR valueTmpl[] = {'%','c',',',' ','%','s','\0'};
    static const WCHAR converterAlias[] = {'I','n','t','e','r','n','a','l',' ','P','C','M',' ','C','o','n','v','e','r','t','e','r','\0'};
    WCHAR szSubKey[17];
    WCHAR szBuffer[256];

    /* Delete ACM priority key and create it anew */
    lError = RegDeleteKeyW(HKEY_CURRENT_USER, basePriorityKey);
    if (lError != ERROR_SUCCESS && lError != ERROR_FILE_NOT_FOUND) {
668
        ERR("unable to remove current key %s (0x%08x) - priority changes won't persist past application end.\n",
669 670 671 672 673
            debugstr_w(basePriorityKey), lError);
        return;
    }
    lError = RegCreateKeyW(HKEY_CURRENT_USER, basePriorityKey, &hPriorityKey);
    if (lError != ERROR_SUCCESS) {
674
        ERR("unable to create key %s (0x%08x) - priority changes won't persist past application end.\n",
675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693
            debugstr_w(basePriorityKey), lError);
        return;
    }
    
    /* Write current list of priorities */
    for (dwPriorityCounter = 0, padid = MSACM_pFirstACMDriverID; padid; padid = padid->pNextACMDriverID) {        
        if (padid->fdwSupport & ACMDRIVERDETAILS_SUPPORTF_LOCAL) continue;
        if (padid->pszDriverAlias == NULL) continue;    /* internal PCM converter is last */

        /* Build required value name */
        dwPriorityCounter++;
        snprintfW(szSubKey, 17, priorityTmpl, dwPriorityCounter);
        
        /* Value has a 1 in front for enabled drivers and 0 for disabled drivers */
        snprintfW(szBuffer, 256, valueTmpl, (padid->fdwSupport & ACMDRIVERDETAILS_SUPPORTF_DISABLED) ? '0' : '1', padid->pszDriverAlias);
        strlwrW(szBuffer);
        
        lError = RegSetValueExW(hPriorityKey, szSubKey, 0, REG_SZ, (BYTE *)szBuffer, (strlenW(szBuffer) + 1) * sizeof(WCHAR));
        if (lError != ERROR_SUCCESS) {
694
            ERR("unable to write value for %s under key %s (0x%08x)\n",
695 696 697 698 699 700 701 702 703 704 705 706 707
                debugstr_w(padid->pszDriverAlias), debugstr_w(basePriorityKey), lError);
        }
    }
    
    /* Build required value name */
    dwPriorityCounter++;
    snprintfW(szSubKey, 17, priorityTmpl, dwPriorityCounter);
        
    /* Value has a 1 in front for enabled drivers and 0 for disabled drivers */
    snprintfW(szBuffer, 256, valueTmpl, '1', converterAlias);
        
    lError = RegSetValueExW(hPriorityKey, szSubKey, 0, REG_SZ, (BYTE *)szBuffer, (strlenW(szBuffer) + 1) * sizeof(WCHAR));
    if (lError != ERROR_SUCCESS) {
708
        ERR("unable to write value for %s under key %s (0x%08x)\n",
709 710 711 712 713
            debugstr_w(converterAlias), debugstr_w(basePriorityKey), lError);
    }
    RegCloseKey(hPriorityKey);
}

714
/***********************************************************************
715
 *           MSACM_UnregisterDriver()
716
 */
717
PWINE_ACMDRIVERID MSACM_UnregisterDriver(PWINE_ACMDRIVERID p)
718
{
719
    PWINE_ACMDRIVERID pNextACMDriverID;
720

721 722
    while (p->pACMDriverList)
	acmDriverClose((HACMDRIVER) p->pACMDriverList, 0);
723

724 725
    HeapFree(MSACM_hHeap, 0, p->pszDriverAlias);
    HeapFree(MSACM_hHeap, 0, p->pszFileName);
726 727
    HeapFree(MSACM_hHeap, 0, p->aFormatTag);

728 729 730
    if (p == MSACM_pFirstACMDriverID)
	MSACM_pFirstACMDriverID = p->pNextACMDriverID;
    if (p == MSACM_pLastACMDriverID)
731
	MSACM_pLastACMDriverID = p->pPrevACMDriverID;
732

733 734
    if (p->pPrevACMDriverID)
	p->pPrevACMDriverID->pNextACMDriverID = p->pNextACMDriverID;
735
    if (p->pNextACMDriverID)
736
	p->pNextACMDriverID->pPrevACMDriverID = p->pPrevACMDriverID;
737

738
    pNextACMDriverID = p->pNextACMDriverID;
739

740
    if (p->pLocalDriver) MSACM_UnregisterLocalDriver(p->pLocalDriver);
741
    HeapFree(MSACM_hHeap, 0, p);
742

743
    return pNextACMDriverID;
744 745 746
}

/***********************************************************************
747
 *           MSACM_UnregisterAllDrivers()
748
 */
749
void MSACM_UnregisterAllDrivers(void)
750
{
751
    PWINE_ACMNOTIFYWND panwnd = MSACM_pFirstACMNotifyWnd;
752
    PWINE_ACMDRIVERID p = MSACM_pFirstACMDriverID;
753

754 755 756 757
    while (p) {
	MSACM_WriteCache(p);
	p = MSACM_UnregisterDriver(p);
    }
758 759 760
    
    while (panwnd) {
	panwnd = MSACM_UnRegisterNotificationWindow(panwnd);
761
    }
762 763 764
}

/***********************************************************************
765
 *           MSACM_GetObj()
766
 */
767
PWINE_ACMOBJ MSACM_GetObj(HACMOBJ hObj, DWORD type)
768
{
769 770
    PWINE_ACMOBJ	pao = (PWINE_ACMOBJ)hObj;

771
    if (pao == NULL || IsBadReadPtr(pao, sizeof(WINE_ACMOBJ)) ||
772 773 774
	((type != WINE_ACMOBJ_DONTCARE) && (type != pao->dwType)))
	return NULL;
    return pao;
775 776 777
}

/***********************************************************************
778
 *           MSACM_GetDriverID()
779
 */
780
PWINE_ACMDRIVERID MSACM_GetDriverID(HACMDRIVERID hDriverID)
781
{
782
    return (PWINE_ACMDRIVERID)MSACM_GetObj((HACMOBJ)hDriverID, WINE_ACMOBJ_DRIVERID);
783 784 785
}

/***********************************************************************
786
 *           MSACM_GetDriver()
787
 */
788
PWINE_ACMDRIVER MSACM_GetDriver(HACMDRIVER hDriver)
789
{
790
    return (PWINE_ACMDRIVER)MSACM_GetObj((HACMOBJ)hDriver, WINE_ACMOBJ_DRIVER);
791 792
}

793 794 795 796 797 798 799 800
/***********************************************************************
 *           MSACM_GetNotifyWnd()
 */
PWINE_ACMNOTIFYWND MSACM_GetNotifyWnd(HACMDRIVERID hDriver)
{
    return (PWINE_ACMNOTIFYWND)MSACM_GetObj((HACMOBJ)hDriver, WINE_ACMOBJ_NOTIFYWND);
}

801 802 803 804 805 806 807 808 809 810 811
/***********************************************************************
 *           MSACM_GetLocalDriver()
 */
/* 
PWINE_ACMLOCALDRIVER MSACM_GetLocalDriver(HACMDRIVER hDriver)
{
    return (PWINE_ACMLOCALDRIVER)MSACM_GetObj((HACMOBJ)hDriver, WINE_ACMOBJ_LOCALDRIVER);
}
*/
#define MSACM_DRIVER_SendMessage(PDRVRINST, msg, lParam1, lParam2) \
        (PDRVRINST)->pLocalDriver->lpDrvProc((PDRVRINST)->dwDriverID, (HDRVR)(PDRVRINST), msg, lParam1, lParam2)
812

813 814 815 816 817 818
/***********************************************************************
 *           MSACM_Message()
 */
MMRESULT MSACM_Message(HACMDRIVER had, UINT uMsg, LPARAM lParam1, LPARAM lParam2)
{
    PWINE_ACMDRIVER	pad = MSACM_GetDriver(had);
819

820 821 822 823 824 825 826
    if (!pad) return MMSYSERR_INVALHANDLE;
    if (pad->hDrvr) return SendDriverMessage(pad->hDrvr, uMsg, lParam1, lParam2);
    if (pad->pLocalDrvrInst) return MSACM_DRIVER_SendMessage(pad->pLocalDrvrInst, uMsg, lParam1, lParam2);

    return MMSYSERR_INVALHANDLE;
}

827 828
static PWINE_ACMLOCALDRIVER MSACM_pFirstACMLocalDriver;
static PWINE_ACMLOCALDRIVER MSACM_pLastACMLocalDriver;
829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067

PWINE_ACMLOCALDRIVER MSACM_RegisterLocalDriver(HMODULE hModule, DRIVERPROC lpDriverProc)
{
    PWINE_ACMLOCALDRIVER paldrv;

    TRACE("(%p, %p)\n", hModule, lpDriverProc);
    if (!hModule || !lpDriverProc) return NULL;
    
    /* look up previous instance of local driver module */
    for (paldrv = MSACM_pFirstACMLocalDriver; paldrv; paldrv = paldrv->pNextACMLocalDrv)
    {
        if (paldrv->hModule == hModule && paldrv->lpDrvProc == lpDriverProc) return paldrv;
    }

    paldrv = HeapAlloc(MSACM_hHeap, 0, sizeof(WINE_ACMLOCALDRIVER));
    paldrv->obj.dwType = WINE_ACMOBJ_LOCALDRIVER;
    paldrv->obj.pACMDriverID = 0;
    paldrv->hModule = hModule;
    paldrv->lpDrvProc = lpDriverProc;
    paldrv->pACMInstList = NULL;

    paldrv->pNextACMLocalDrv = NULL;
    paldrv->pPrevACMLocalDrv = MSACM_pLastACMLocalDriver;
    if (MSACM_pLastACMLocalDriver)
	MSACM_pLastACMLocalDriver->pNextACMLocalDrv = paldrv;
    MSACM_pLastACMLocalDriver = paldrv;
    if (!MSACM_pFirstACMLocalDriver)
	MSACM_pFirstACMLocalDriver = paldrv;

    return paldrv;
}

/**************************************************************************
 *			MSACM_GetNumberOfModuleRefs		[internal]
 *
 * Returns the number of open drivers which share the same module.
 * Inspired from implementation in dlls/winmm/driver.c
 */
static unsigned MSACM_GetNumberOfModuleRefs(HMODULE hModule, DRIVERPROC lpDrvProc, WINE_ACMLOCALDRIVERINST ** found)
{
    PWINE_ACMLOCALDRIVER lpDrv;
    unsigned		count = 0;

    if (found) *found = NULL;
    for (lpDrv = MSACM_pFirstACMLocalDriver; lpDrv; lpDrv = lpDrv->pNextACMLocalDrv)
    {
	if (lpDrv->hModule == hModule && lpDrv->lpDrvProc == lpDrvProc)
        {
            PWINE_ACMLOCALDRIVERINST pInst = lpDrv->pACMInstList;
        
	    while (pInst) {
                if (found && !*found) *found = pInst;
	        count++;
	        pInst = pInst->pNextACMInst;
	    }
	}
    }
    return count;
}

/**************************************************************************
 *				MSACM_RemoveFromList		[internal]
 *
 * Generates all the logic to handle driver closure / deletion
 * Removes a driver struct to the list of open drivers.
 */
static	BOOL	MSACM_RemoveFromList(PWINE_ACMLOCALDRIVERINST lpDrv)
{
    PWINE_ACMLOCALDRIVER pDriverBase = lpDrv->pLocalDriver;
    PWINE_ACMLOCALDRIVERINST pPrevInst;

    /* last of this driver in list ? */
    if (MSACM_GetNumberOfModuleRefs(pDriverBase->hModule, pDriverBase->lpDrvProc, NULL) == 1) {
        MSACM_DRIVER_SendMessage(lpDrv, DRV_DISABLE, 0L, 0L);
        MSACM_DRIVER_SendMessage(lpDrv, DRV_FREE,    0L, 0L);
    }
    
    pPrevInst = NULL;
    if (pDriverBase->pACMInstList != lpDrv) {
        pPrevInst = pDriverBase->pACMInstList;
        while (pPrevInst && pPrevInst->pNextACMInst != lpDrv)
            pPrevInst = pPrevInst->pNextACMInst;
        if (!pPrevInst) {
            ERR("requested to remove invalid instance %p\n", pPrevInst);
            return FALSE;
        }
    }
    if (!pPrevInst) {
        /* first driver instance on list */
        pDriverBase->pACMInstList = lpDrv->pNextACMInst;
    } else {
        pPrevInst->pNextACMInst = lpDrv->pNextACMInst;
    }
    return TRUE;
}

/**************************************************************************
 *				MSACM_AddToList		[internal]
 *
 * Adds a driver struct to the list of open drivers.
 * Generates all the logic to handle driver creation / open.
 */
static	BOOL	MSACM_AddToList(PWINE_ACMLOCALDRIVERINST lpNewDrv, LPARAM lParam2)
{
    PWINE_ACMLOCALDRIVER pDriverBase = lpNewDrv->pLocalDriver;

    /* first of this driver in list ? */
    if (MSACM_GetNumberOfModuleRefs(pDriverBase->hModule, pDriverBase->lpDrvProc, NULL) == 0) {
        if (MSACM_DRIVER_SendMessage(lpNewDrv, DRV_LOAD, 0L, 0L) != DRV_SUCCESS) {
            FIXME("DRV_LOAD failed on driver %p\n", lpNewDrv);
            return FALSE;
        }
        /* returned value is not checked */
        MSACM_DRIVER_SendMessage(lpNewDrv, DRV_ENABLE, 0L, 0L);
    }

    lpNewDrv->pNextACMInst = NULL;
    if (pDriverBase->pACMInstList == NULL) {
	pDriverBase->pACMInstList = lpNewDrv;
    } else {
        PWINE_ACMLOCALDRIVERINST lpDrvInst = pDriverBase->pACMInstList;
    
        while (lpDrvInst->pNextACMInst != NULL)
            lpDrvInst = lpDrvInst->pNextACMInst;

	lpDrvInst->pNextACMInst = lpNewDrv;
    }

    /* Now just open a new instance of a driver on this module */
    lpNewDrv->dwDriverID = MSACM_DRIVER_SendMessage(lpNewDrv, DRV_OPEN, 0, lParam2);

    if (lpNewDrv->dwDriverID == 0) {
        FIXME("DRV_OPEN failed on driver %p\n", lpNewDrv);
        MSACM_RemoveFromList(lpNewDrv);
        return FALSE;
    }
    return TRUE;
}

PWINE_ACMLOCALDRIVERINST MSACM_OpenLocalDriver(PWINE_ACMLOCALDRIVER paldrv, LPARAM lParam2)
{
    PWINE_ACMLOCALDRIVERINST pDrvInst;
    
    pDrvInst = HeapAlloc(MSACM_hHeap, 0, sizeof(WINE_ACMLOCALDRIVERINST));
    pDrvInst->pLocalDriver = paldrv;
    pDrvInst->dwDriverID = 0;
    pDrvInst->pNextACMInst = NULL;
    pDrvInst->bSession = FALSE;
    
    /* Win32 installable drivers must support a two phase opening scheme:
     * + first open with NULL as lParam2 (session instance),
     * + then do a second open with the real non null lParam2)
     */
    if (MSACM_GetNumberOfModuleRefs(paldrv->hModule, paldrv->lpDrvProc, NULL) == 0 && lParam2)
    {
        PWINE_ACMLOCALDRIVERINST   ret;

        if (!MSACM_AddToList(pDrvInst, 0L))
        {
            ERR("load0 failed\n");
            goto exit;
        }
        ret = MSACM_OpenLocalDriver(paldrv, lParam2);
        if (!ret)
        {
            MSACM_CloseLocalDriver(pDrvInst);
            ERR("load1 failed\n");
            goto exit;
        }
        pDrvInst->bSession = TRUE;
        return ret;
    }
    
    if (!MSACM_AddToList(pDrvInst, lParam2))
    {
        ERR("load failed\n");
        goto exit;
    }

    TRACE("=> %p\n", pDrvInst);
    return pDrvInst;
exit:
    HeapFree(MSACM_hHeap, 0, pDrvInst);
    return NULL;
}

LRESULT MSACM_CloseLocalDriver(PWINE_ACMLOCALDRIVERINST paldrv)
{
    if (MSACM_RemoveFromList(paldrv)) {
        PWINE_ACMLOCALDRIVERINST lpDrv0;
        PWINE_ACMLOCALDRIVER pDriverBase = paldrv->pLocalDriver;
    
        MSACM_DRIVER_SendMessage(paldrv, DRV_CLOSE, 0, 0);
        paldrv->dwDriverID = 0;
    
        if (paldrv->bSession)
            ERR("should not directly close session instance (%p)\n", paldrv);

        /* if driver has an opened session instance, we have to close it too */
        if (MSACM_GetNumberOfModuleRefs(pDriverBase->hModule, pDriverBase->lpDrvProc, &lpDrv0) == 1 &&
                lpDrv0->bSession)
        {
            MSACM_DRIVER_SendMessage(lpDrv0, DRV_CLOSE, 0L, 0L);
            lpDrv0->dwDriverID = 0;
            MSACM_RemoveFromList(lpDrv0);
            HeapFree(GetProcessHeap(), 0, lpDrv0);
        }

        HeapFree(MSACM_hHeap, 0, paldrv);
        return TRUE;
    }
    ERR("unable to close driver instance\n");
    return FALSE;
}

PWINE_ACMLOCALDRIVER MSACM_UnregisterLocalDriver(PWINE_ACMLOCALDRIVER paldrv)
{
    PWINE_ACMLOCALDRIVER pNextACMLocalDriver;

    if (paldrv->pACMInstList) {
        ERR("local driver instances still present after closing all drivers - memory leak\n");
        return NULL;
    }

    if (paldrv == MSACM_pFirstACMLocalDriver)
	MSACM_pFirstACMLocalDriver = paldrv->pNextACMLocalDrv;
    if (paldrv == MSACM_pLastACMLocalDriver)
	MSACM_pLastACMLocalDriver = paldrv->pPrevACMLocalDrv;

    if (paldrv->pPrevACMLocalDrv)
	paldrv->pPrevACMLocalDrv->pNextACMLocalDrv = paldrv->pNextACMLocalDrv;
    if (paldrv->pNextACMLocalDrv)
	paldrv->pNextACMLocalDrv->pPrevACMLocalDrv = paldrv->pPrevACMLocalDrv;

    pNextACMLocalDriver = paldrv->pNextACMLocalDrv;

    HeapFree(MSACM_hHeap, 0, paldrv);

    return pNextACMLocalDriver;
1068
}