dlls/quartz/passthrough.c

   1 /*
   2  * Seeking passthrough object
   3  *
   4  * Copyright 2020 Zebediah Figura for CodeWeavers
   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 "quartz_private.h"
  22
  23 WINE_DEFAULT_DEBUG_CHANNEL(quartz);
  24
  25 struct seeking_passthrough
  26 {
  27     struct strmbase_passthrough passthrough;
  28
  29     IUnknown IUnknown_inner;
  30     IUnknown *outer_unk;
  31     LONG refcount;
  32 };
  33
  34 static struct seeking_passthrough *impl_from_IUnknown(IUnknown *iface)
  35 {
  36     return CONTAINING_RECORD(iface, struct seeking_passthrough, IUnknown_inner);
  37 }
  38
  39 static HRESULT WINAPI seeking_passthrough_QueryInterface(IUnknown *iface, REFIID iid, void **out)
  40 {
  41     struct seeking_passthrough *passthrough = impl_from_IUnknown(iface);
  42
  43     TRACE("passthrough %p, iid %s, out %p.\n", passthrough, debugstr_guid(iid), out);
  44
  45     if (IsEqualGUID(iid, &IID_IUnknown))
  46         *out = iface;
  47     else if (IsEqualGUID(iid, &IID_IMediaPosition))
  48         *out = &passthrough->passthrough.IMediaPosition_iface;
  49     else if (IsEqualGUID(iid, &IID_IMediaSeeking))
  50         *out = &passthrough->passthrough.IMediaSeeking_iface;
  51     else if (IsEqualGUID(iid, &IID_ISeekingPassThru))
  52         *out = &passthrough->passthrough.ISeekingPassThru_iface;
  53     else
  54     {
  55         *out = NULL;
  56         WARN("%s not implemented, returning E_NOINTERFACE.\n", debugstr_guid(iid));
  57         return E_NOINTERFACE;
  58     }
  59
  60     IUnknown_AddRef((IUnknown *)*out);
  61     return S_OK;
  62 }
  63
  64 static ULONG WINAPI seeking_passthrough_AddRef(IUnknown *iface)
  65 {
  66     struct seeking_passthrough *passthrough = impl_from_IUnknown(iface);
  67     ULONG refcount = InterlockedIncrement(&passthrough->refcount);
  68
  69     TRACE("%p increasing refcount to %lu.\n", passthrough, refcount);
  70     return refcount;
  71 }
  72
  73 static ULONG WINAPI seeking_passthrough_Release(IUnknown *iface)
  74 {
  75     struct seeking_passthrough *passthrough = impl_from_IUnknown(iface);
  76     ULONG refcount = InterlockedDecrement(&passthrough->refcount);
  77
  78     TRACE("%p decreasing refcount to %lu.\n", passthrough, refcount);
  79     if (!refcount)
  80     {
  81         strmbase_passthrough_cleanup(&passthrough->passthrough);
  82         free(passthrough);
  83     }
  84     return refcount;
  85 }
  86
  87 static const IUnknownVtbl seeking_passthrough_vtbl =
  88 {
  89     seeking_passthrough_QueryInterface,
  90     seeking_passthrough_AddRef,
  91     seeking_passthrough_Release,
  92 };
  93
  94 HRESULT seeking_passthrough_create(IUnknown *outer, IUnknown **out)
  95 {
  96     struct seeking_passthrough *object;
  97
  98     TRACE("outer %p, out %p.\n", outer, out);
  99
 100     if (!(object = calloc(1, sizeof(*object))))
 101         return E_OUTOFMEMORY;
 102
 103     object->IUnknown_inner.lpVtbl = &seeking_passthrough_vtbl;
 104     object->outer_unk = outer ? outer : &object->IUnknown_inner;
 105     object->refcount = 1;
 106
 107     strmbase_passthrough_init(&object->passthrough, object->outer_unk);
 108
 109     TRACE("Created seeking passthrough %p.\n", object);
 110     *out = &object->IUnknown_inner;
 111     return S_OK;
 112 }