dlls/strmbase/enumpins.c

   1 /*
   2  * Implementation of IEnumPins Interface
   3  *
   4  * Copyright 2003 Robert Shearman
   5  * Copyright 2010 Aric Stewart, CodeWeavers
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #define COBJMACROS
  23
  24 #include "dshow.h"
  25 #include "wine/strmbase.h"
  26 #include "wine/debug.h"
  27
  28 WINE_DEFAULT_DEBUG_CHANNEL(strmbase);
  29
  30 typedef struct IEnumPinsImpl
  31 {
  32     IEnumPins IEnumPins_iface;
  33     LONG refCount;
  34     ULONG uIndex;
  35     BaseFilter *base;
  36     BaseFilter_GetPin receive_pin;
  37     BaseFilter_GetPinCount receive_pincount;
  38     BaseFilter_GetPinVersion receive_version;
  39     DWORD Version;
  40 } IEnumPinsImpl;
  41
  42 static inline IEnumPinsImpl *impl_from_IEnumPins(IEnumPins *iface)
  43 {
  44     return CONTAINING_RECORD(iface, IEnumPinsImpl, IEnumPins_iface);
  45 }
  46
  47 static const struct IEnumPinsVtbl IEnumPinsImpl_Vtbl;
  48
  49 HRESULT WINAPI EnumPins_Construct(BaseFilter *base,  BaseFilter_GetPin receive_pin, BaseFilter_GetPinCount receive_pincount, BaseFilter_GetPinVersion receive_version, IEnumPins ** ppEnum)
  50 {
  51     IEnumPinsImpl * pEnumPins;
  52
  53     if (!ppEnum)
  54         return E_POINTER;
  55
  56     pEnumPins = CoTaskMemAlloc(sizeof(IEnumPinsImpl));
  57     if (!pEnumPins)
  58     {
  59         *ppEnum = NULL;
  60         return E_OUTOFMEMORY;
  61     }
  62     pEnumPins->IEnumPins_iface.lpVtbl = &IEnumPinsImpl_Vtbl;
  63     pEnumPins->refCount = 1;
  64     pEnumPins->uIndex = 0;
  65     pEnumPins->receive_pin = receive_pin;
  66     pEnumPins->receive_pincount = receive_pincount;
  67     pEnumPins->receive_version = receive_version;
  68     pEnumPins->base = base;
  69     IBaseFilter_AddRef((IBaseFilter*)base);
  70     *ppEnum = &pEnumPins->IEnumPins_iface;
  71     pEnumPins->Version = receive_version(base);
  72
  73     TRACE("Created new enumerator (%p)\n", *ppEnum);
  74     return S_OK;
  75 }
  76
  77 static HRESULT WINAPI IEnumPinsImpl_QueryInterface(IEnumPins * iface, REFIID riid, LPVOID * ppv)
  78 {
  79     TRACE("(%s, %p)\n", debugstr_guid(riid), ppv);
  80
  81     *ppv = NULL;
  82
  83     if (IsEqualIID(riid, &IID_IUnknown))
  84         *ppv = iface;
  85     else if (IsEqualIID(riid, &IID_IEnumPins))
  86         *ppv = iface;
  87
  88     if (*ppv)
  89     {
  90         IUnknown_AddRef((IUnknown *)(*ppv));
  91         return S_OK;
  92     }
  93
  94     FIXME("No interface for %s!\n", debugstr_guid(riid));
  95
  96     return E_NOINTERFACE;
  97 }
  98
  99 static ULONG WINAPI IEnumPinsImpl_AddRef(IEnumPins * iface)
 100 {
 101     IEnumPinsImpl *This = impl_from_IEnumPins(iface);
 102     ULONG refCount = InterlockedIncrement(&This->refCount);
 103
 104     TRACE("(%p)->() AddRef from %d\n", This, refCount - 1);
 105
 106     return refCount;
 107 }
 108
 109 static ULONG WINAPI IEnumPinsImpl_Release(IEnumPins * iface)
 110 {
 111     IEnumPinsImpl *This = impl_from_IEnumPins(iface);
 112     ULONG refCount = InterlockedDecrement(&This->refCount);
 113
 114     TRACE("(%p)->() Release from %d\n", This, refCount + 1);
 115
 116     if (!refCount)
 117     {
 118         IBaseFilter_Release((IBaseFilter*)This->base);
 119         CoTaskMemFree(This);
 120         return 0;
 121     }
 122     else
 123         return refCount;
 124 }
 125
 126 static HRESULT WINAPI IEnumPinsImpl_Next(IEnumPins * iface, ULONG cPins, IPin ** ppPins, ULONG * pcFetched)
 127 {
 128     IEnumPinsImpl *This = impl_from_IEnumPins(iface);
 129     HRESULT hr = S_OK;
 130     ULONG i = 0;
 131
 132     TRACE("(%u, %p, %p)\n", cPins, ppPins, pcFetched);
 133
 134     if (!ppPins)
 135         return E_POINTER;
 136
 137     if (cPins > 1 && !pcFetched)
 138         return E_INVALIDARG;
 139
 140     if (pcFetched)
 141         *pcFetched = 0;
 142
 143     if (This->Version != This->receive_version(This->base))
 144         return VFW_E_ENUM_OUT_OF_SYNC;
 145
 146     while (i < cPins && hr == S_OK)
 147     {
 148        IPin *pin;
 149        pin = This->receive_pin(This->base, This->uIndex + i);
 150
 151        if (!pin)
 152          break;
 153        else
 154          ppPins[i] = pin;
 155        ++i;
 156     }
 157
 158     if (pcFetched)
 159         *pcFetched = i;
 160     This->uIndex += i;
 161
 162     if (i < cPins)
 163         return S_FALSE;
 164     return S_OK;
 165 }
 166
 167 static HRESULT WINAPI IEnumPinsImpl_Skip(IEnumPins * iface, ULONG cPins)
 168 {
 169     IEnumPinsImpl *This = impl_from_IEnumPins(iface);
 170
 171     TRACE("(%u)\n", cPins);
 172
 173     if (This->Version != This->receive_version(This->base))
 174         return VFW_E_ENUM_OUT_OF_SYNC;
 175
 176     if (This->receive_pincount(This->base) >= This->uIndex + cPins)
 177         return S_FALSE;
 178
 179     This->uIndex += cPins;
 180     return S_OK;
 181 }
 182
 183 static HRESULT WINAPI IEnumPinsImpl_Reset(IEnumPins * iface)
 184 {
 185     IEnumPinsImpl *This = impl_from_IEnumPins(iface);
 186
 187     TRACE("IEnumPinsImpl::Reset()\n");
 188     This->Version = This->receive_version(This->base);
 189
 190     This->uIndex = 0;
 191     return S_OK;
 192 }
 193
 194 static HRESULT WINAPI IEnumPinsImpl_Clone(IEnumPins * iface, IEnumPins ** ppEnum)
 195 {
 196     HRESULT hr;
 197     IEnumPinsImpl *This = impl_from_IEnumPins(iface);
 198
 199     TRACE("(%p)\n", ppEnum);
 200
 201     hr = EnumPins_Construct(This->base, This->receive_pin, This->receive_pincount, This->receive_version, ppEnum);
 202     if (FAILED(hr))
 203         return hr;
 204     return IEnumPins_Skip(*ppEnum, This->uIndex);
 205 }
 206
 207 static const IEnumPinsVtbl IEnumPinsImpl_Vtbl =
 208 {
 209     IEnumPinsImpl_QueryInterface,
 210     IEnumPinsImpl_AddRef,
 211     IEnumPinsImpl_Release,
 212     IEnumPinsImpl_Next,
 213     IEnumPinsImpl_Skip,
 214     IEnumPinsImpl_Reset,
 215     IEnumPinsImpl_Clone
 216 };