dlls/qcap/enumpins.c

   1 /*
   2  * Implementation of IEnumPins Interface
   3  *
   4  * Copyright 2003 Robert Shearman
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include <stdarg.h>
  22
  23 #define COBJMACROS
  24
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "wtypes.h"
  28 #include "wingdi.h"
  29 #include "winuser.h"
  30 #include "dshow.h"
  31
  32 #include "qcap_main.h"
  33
  34 #include "wine/debug.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(qcap);
  37
  38 typedef struct IEnumPinsImpl
  39 {
  40     const IEnumPinsVtbl * lpVtbl;
  41     LONG refCount;
  42     ENUMPINDETAILS enumPinDetails;
  43     ULONG uIndex;
  44 } IEnumPinsImpl;
  45
  46 static const struct IEnumPinsVtbl IEnumPinsImpl_Vtbl;
  47
  48 HRESULT IEnumPinsImpl_Construct(const ENUMPINDETAILS * pDetails, IEnumPins ** ppEnum)
  49 {
  50     IEnumPinsImpl * pEnumPins = CoTaskMemAlloc(sizeof(IEnumPinsImpl));
  51     if (!pEnumPins)
  52     {
  53         *ppEnum = NULL;
  54         return E_OUTOFMEMORY;
  55     }
  56     pEnumPins->lpVtbl = &IEnumPinsImpl_Vtbl;
  57     pEnumPins->refCount = 1;
  58     pEnumPins->uIndex = 0;
  59     pEnumPins->enumPinDetails = *pDetails;
  60     *ppEnum = (IEnumPins *)(&pEnumPins->lpVtbl);
  61     ObjectRefCount(TRUE);
  62     return S_OK;
  63 }
  64
  65 static HRESULT WINAPI IEnumPinsImpl_QueryInterface(IEnumPins * iface, REFIID riid, LPVOID * ppv)
  66 {
  67     TRACE("(%s, %p)\n", debugstr_guid(riid), ppv);
  68
  69     *ppv = NULL;
  70
  71     if (IsEqualIID(riid, &IID_IUnknown))
  72         *ppv = (LPVOID)iface;
  73     else if (IsEqualIID(riid, &IID_IEnumPins))
  74         *ppv = (LPVOID)iface;
  75
  76     if (*ppv)
  77     {
  78         IUnknown_AddRef((IUnknown *)(*ppv));
  79         return S_OK;
  80     }
  81
  82     FIXME("No interface for %s!\n", debugstr_guid(riid));
  83
  84     return E_NOINTERFACE;
  85 }
  86
  87 static ULONG WINAPI IEnumPinsImpl_AddRef(IEnumPins * iface)
  88 {
  89     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
  90     ULONG refCount = InterlockedIncrement(&This->refCount);
  91
  92     TRACE("()\n");
  93
  94     return refCount;
  95 }
  96
  97 static ULONG WINAPI IEnumPinsImpl_Release(IEnumPins * iface)
  98 {
  99     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 100     ULONG refCount = InterlockedDecrement(&This->refCount);
 101
 102     TRACE("()\n");
 103
 104     if (!refCount)
 105     {
 106         CoTaskMemFree(This);
 107         ObjectRefCount(FALSE);
 108     }
 109     return refCount;
 110 }
 111
 112 static HRESULT WINAPI IEnumPinsImpl_Next(IEnumPins * iface, ULONG cPins, IPin ** ppPins, ULONG * pcFetched)
 113 {
 114     ULONG cFetched;
 115     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 116
 117     cFetched = min(This->enumPinDetails.cPins, This->uIndex + cPins) - This->uIndex;
 118
 119     TRACE("(%u, %p, %p)\n", cPins, ppPins, pcFetched);
 120
 121     if (cFetched > 0)
 122     {
 123         ULONG i;
 124         for (i = 0; i < cFetched; i++) {
 125             IPin_AddRef(This->enumPinDetails.ppPins[This->uIndex + i]);
 126             ppPins[i] = This->enumPinDetails.ppPins[This->uIndex + i];
 127         }
 128     }
 129
 130     if ((cPins != 1) || pcFetched)
 131         *pcFetched = cFetched;
 132
 133     This->uIndex += cFetched;
 134
 135     if (cFetched != cPins)
 136         return S_FALSE;
 137     return S_OK;
 138 }
 139
 140 static HRESULT WINAPI IEnumPinsImpl_Skip(IEnumPins * iface, ULONG cPins)
 141 {
 142     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 143
 144     TRACE("(%u)\n", cPins);
 145
 146     if (This->uIndex + cPins < This->enumPinDetails.cPins)
 147     {
 148         This->uIndex += cPins;
 149         return S_OK;
 150     }
 151     return S_FALSE;
 152 }
 153
 154 static HRESULT WINAPI IEnumPinsImpl_Reset(IEnumPins * iface)
 155 {
 156     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 157
 158     TRACE("IEnumPinsImpl::Reset()\n");
 159
 160     This->uIndex = 0;
 161     return S_OK;
 162 }
 163
 164 static HRESULT WINAPI IEnumPinsImpl_Clone(IEnumPins * iface, IEnumPins ** ppEnum)
 165 {
 166     HRESULT hr;
 167     IEnumPinsImpl *This = (IEnumPinsImpl *)iface;
 168
 169     TRACE("(%p)\n", ppEnum);
 170
 171     hr = IEnumPinsImpl_Construct(&This->enumPinDetails, ppEnum);
 172     if (FAILED(hr))
 173         return hr;
 174     return IEnumPins_Skip(*ppEnum, This->uIndex);
 175 }
 176
 177 static const IEnumPinsVtbl IEnumPinsImpl_Vtbl =
 178 {
 179     IEnumPinsImpl_QueryInterface,
 180     IEnumPinsImpl_AddRef,
 181     IEnumPinsImpl_Release,
 182     IEnumPinsImpl_Next,
 183     IEnumPinsImpl_Skip,
 184     IEnumPinsImpl_Reset,
 185     IEnumPinsImpl_Clone
 186 };