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/* $Id: HostVideoInputDeviceImpl.cpp $ */
/** @file
* Host video capture device implementation.
*/
/*
* Copyright (C) 2013-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#define LOG_GROUP LOG_GROUP_MAIN_HOSTVIDEOINPUTDEVICE
#include "HostVideoInputDeviceImpl.h"
#include "LoggingNew.h"
#include "VirtualBoxImpl.h"
#ifdef VBOX_WITH_EXTPACK
# include "ExtPackManagerImpl.h"
#endif
#include <iprt/err.h>
#include <iprt/ldr.h>
#include <iprt/path.h>
#include <VBox/sup.h>
/*
* HostVideoInputDevice implementation.
*/
DEFINE_EMPTY_CTOR_DTOR(HostVideoInputDevice)
HRESULT HostVideoInputDevice::FinalConstruct()
{
return BaseFinalConstruct();
}
void HostVideoInputDevice::FinalRelease()
{
uninit();
BaseFinalRelease();
}
/*
* Initializes the instance.
*/
HRESULT HostVideoInputDevice::init(const com::Utf8Str &name, const com::Utf8Str &path, const com::Utf8Str &alias)
{
LogFlowThisFunc(("\n"));
/* Enclose the state transition NotReady->InInit->Ready */
AutoInitSpan autoInitSpan(this);
AssertReturn(autoInitSpan.isOk(), E_FAIL);
m.name = name;
m.path = path;
m.alias = alias;
/* Confirm a successful initialization */
autoInitSpan.setSucceeded();
return S_OK;
}
/*
* Uninitializes the instance.
* Called either from FinalRelease() or by the parent when it gets destroyed.
*/
void HostVideoInputDevice::uninit()
{
LogFlowThisFunc(("\n"));
/* Enclose the state transition Ready->InUninit->NotReady */
AutoUninitSpan autoUninitSpan(this);
if (autoUninitSpan.uninitDone())
return;
m.name.setNull();
m.path.setNull();
m.alias.setNull();
}
static HRESULT hostVideoInputDeviceAdd(HostVideoInputDeviceList *pList,
const com::Utf8Str &name,
const com::Utf8Str &path,
const com::Utf8Str &alias)
{
ComObjPtr<HostVideoInputDevice> obj;
HRESULT hrc = obj.createObject();
if (SUCCEEDED(hrc))
{
hrc = obj->init(name, path, alias);
if (SUCCEEDED(hrc))
pList->push_back(obj);
}
return hrc;
}
static DECLCALLBACK(int) hostWebcamAdd(void *pvUser,
const char *pszName,
const char *pszPath,
const char *pszAlias,
uint64_t *pu64Result)
{
HostVideoInputDeviceList *pList = (HostVideoInputDeviceList *)pvUser;
HRESULT hrc = hostVideoInputDeviceAdd(pList, pszName, pszPath, pszAlias);
if (FAILED(hrc))
{
*pu64Result = (uint64_t)hrc;
return VERR_NOT_SUPPORTED;
}
return VINF_SUCCESS;
}
/** @todo These typedefs must be in a header. */
typedef DECLCALLBACKTYPE(int, FNVBOXHOSTWEBCAMADD,(void *pvUser,
const char *pszName,
const char *pszPath,
const char *pszAlias,
uint64_t *pu64Result));
typedef FNVBOXHOSTWEBCAMADD *PFNVBOXHOSTWEBCAMADD;
typedef DECLCALLBACKTYPE(int, FNVBOXHOSTWEBCAMLIST,(PFNVBOXHOSTWEBCAMADD pfnWebcamAdd,
void *pvUser,
uint64_t *pu64WebcamAddResult));
typedef FNVBOXHOSTWEBCAMLIST *PFNVBOXHOSTWEBCAMLIST;
/*
* Work around clang being unhappy about PFNVBOXHOSTWEBCAMLIST
* ("exception specifications are not allowed beyond a single level of
* indirection"). The original comment for 13.0 check said: "assuming
* this issue will be fixed eventually". Well, 13.0 is now out, and
* it was not.
*/
#define CLANG_EXCEPTION_SPEC_HACK (RT_CLANG_PREREQ(11, 0) /* && !RT_CLANG_PREREQ(13, 0) */)
#if CLANG_EXCEPTION_SPEC_HACK
static int loadHostWebcamLibrary(const char *pszPath, RTLDRMOD *phmod, void **ppfn)
#else
static int loadHostWebcamLibrary(const char *pszPath, RTLDRMOD *phmod, PFNVBOXHOSTWEBCAMLIST *ppfn)
#endif
{
int vrc;
if (RTPathHavePath(pszPath))
{
RTLDRMOD hmod = NIL_RTLDRMOD;
RTERRINFOSTATIC ErrInfo;
vrc = SUPR3HardenedLdrLoadPlugIn(pszPath, &hmod, RTErrInfoInitStatic(&ErrInfo));
if (RT_SUCCESS(vrc))
{
static const char s_szSymbol[] = "VBoxHostWebcamList";
vrc = RTLdrGetSymbol(hmod, s_szSymbol, (void **)ppfn);
if (RT_SUCCESS(vrc))
*phmod = hmod;
else
{
if (vrc != VERR_SYMBOL_NOT_FOUND)
LogRel(("Resolving symbol '%s': %Rrc\n", s_szSymbol, vrc));
RTLdrClose(hmod);
hmod = NIL_RTLDRMOD;
}
}
else
{
LogRel(("Loading the library '%s': %Rrc\n", pszPath, vrc));
if (RTErrInfoIsSet(&ErrInfo.Core))
LogRel((" %s\n", ErrInfo.Core.pszMsg));
}
}
else
{
LogRel(("Loading the library '%s': No path! Refusing to try loading it!\n", pszPath));
vrc = VERR_INVALID_PARAMETER;
}
return vrc;
}
static HRESULT fillDeviceList(VirtualBox *pVirtualBox, HostVideoInputDeviceList *pList)
{
Utf8Str strLibrary;
#ifdef VBOX_WITH_EXTPACK
ExtPackManager *pExtPackMgr = pVirtualBox->i_getExtPackManager();
HRESULT hrc = pExtPackMgr->i_getLibraryPathForExtPack("VBoxHostWebcam", ORACLE_PUEL_EXTPACK_NAME, &strLibrary);
#else
HRESULT hrc = E_NOTIMPL;
#endif
if (SUCCEEDED(hrc))
{
PFNVBOXHOSTWEBCAMLIST pfn = NULL;
RTLDRMOD hmod = NIL_RTLDRMOD;
#if CLANG_EXCEPTION_SPEC_HACK
int vrc = loadHostWebcamLibrary(strLibrary.c_str(), &hmod, (void **)&pfn);
#else
int vrc = loadHostWebcamLibrary(strLibrary.c_str(), &hmod, &pfn);
#endif
LogRel(("Load [%s] vrc=%Rrc\n", strLibrary.c_str(), vrc));
if (RT_SUCCESS(vrc))
{
uint64_t u64Result = S_OK;
vrc = pfn(hostWebcamAdd, pList, &u64Result);
Log(("VBoxHostWebcamList vrc %Rrc, result 0x%08RX64\n", vrc, u64Result));
if (RT_FAILURE(vrc))
hrc = (HRESULT)u64Result;
RTLdrClose(hmod);
hmod = NIL_RTLDRMOD;
}
if (SUCCEEDED(hrc))
{
if (RT_FAILURE(vrc))
hrc = pVirtualBox->setErrorBoth(VBOX_E_IPRT_ERROR, vrc,
HostVideoInputDevice::tr("Failed to get webcam list: %Rrc"), vrc);
}
}
return hrc;
}
/* static */ HRESULT HostVideoInputDevice::queryHostDevices(VirtualBox *pVirtualBox, HostVideoInputDeviceList *pList)
{
HRESULT hrc = fillDeviceList(pVirtualBox, pList);
if (FAILED(hrc))
pList->clear();
return hrc;
}
/* vi: set tabstop=4 shiftwidth=4 expandtab: */
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