diff options
author | Val Doroshchuk <valentyn.doroshchuk@qt.io> | 2019-08-30 12:59:29 +0200 |
---|---|---|
committer | VaL Doroshchuk <valentyn.doroshchuk@qt.io> | 2019-09-09 12:33:18 +0200 |
commit | cb06ede8ba9a33adbbfdc690faa1a83be4e70b55 (patch) | |
tree | 2c3da763347405210683bbb860726214d69a8714 /src/plugins | |
parent | 97177277a2fcca974d7599ab8ea12ad80ab30efc (diff) |
DirectShow: Allow QMediaPlayer in secondary thread
Since using of any COM objects must be only after CoInitialize(),
otherwise CoCreateInstance() returns nothing which causes a crash.
If QMediaPlayer is moved to another thread, loading of any content will
also cause a crash because of COM is not initialized.
Proposing to use thread_local ref counter to keep each thread
initialized and avoid double initialization.
Fixes: QTBUG-77163
Change-Id: I81c67d6407b853c824edd3b42454fddf792fd90c
Reviewed-by: Christian Strømme <christian.stromme@qt.io>
Diffstat (limited to 'src/plugins')
-rw-r--r-- | src/plugins/directshow/common/directshowutils.cpp | 13 | ||||
-rw-r--r-- | src/plugins/directshow/common/directshowutils.h | 4 | ||||
-rw-r--r-- | src/plugins/directshow/dsserviceplugin.cpp | 32 | ||||
-rw-r--r-- | src/plugins/directshow/player/directshowplayerservice.cpp | 2 |
4 files changed, 29 insertions, 22 deletions
diff --git a/src/plugins/directshow/common/directshowutils.cpp b/src/plugins/directshow/common/directshowutils.cpp index 48d5dbd8d..13b51deb5 100644 --- a/src/plugins/directshow/common/directshowutils.cpp +++ b/src/plugins/directshow/common/directshowutils.cpp @@ -309,4 +309,17 @@ bool DirectShowUtils::connectFilters(IGraphBuilder *graph, return false; } +thread_local static int g_refCount = 0; +void DirectShowUtils::CoInitializeIfNeeded() +{ + if (++g_refCount == 1) + ::CoInitialize(nullptr); +} + +void DirectShowUtils::CoUninitializeIfNeeded() +{ + if (--g_refCount == 0) + ::CoUninitialize(); +} + QT_END_NAMESPACE diff --git a/src/plugins/directshow/common/directshowutils.h b/src/plugins/directshow/common/directshowutils.h index 09c81c257..5f2cfaa23 100644 --- a/src/plugins/directshow/common/directshowutils.h +++ b/src/plugins/directshow/common/directshowutils.h @@ -80,6 +80,10 @@ bool connectFilters(IGraphBuilder *graph, IBaseFilter *downstreamFilter, bool autoConnect = false, HRESULT *hrOut = nullptr); + +void CoInitializeIfNeeded(); +void CoUninitializeIfNeeded(); + } QT_END_NAMESPACE diff --git a/src/plugins/directshow/dsserviceplugin.cpp b/src/plugins/directshow/dsserviceplugin.cpp index f92e37c00..cc25e35b7 100644 --- a/src/plugins/directshow/dsserviceplugin.cpp +++ b/src/plugins/directshow/dsserviceplugin.cpp @@ -54,6 +54,7 @@ #include "directshowplayerservice.h" #include <qmediaserviceproviderplugin.h> +#include "directshowutils.h" extern const CLSID CLSID_VideoInputDeviceCategory; @@ -74,28 +75,15 @@ extern const CLSID CLSID_VideoInputDeviceCategory; QT_BEGIN_NAMESPACE Q_LOGGING_CATEGORY(qtDirectShowPlugin, "qt.multimedia.plugins.directshow") -static int g_refCount = 0; -void addRefCount() -{ - if (++g_refCount == 1) - CoInitialize(nullptr); -} - -void releaseRefCount() -{ - if (--g_refCount == 0) - CoUninitialize(); -} - QMediaService* DSServicePlugin::create(QString const& key) { if (key == QLatin1String(Q_MEDIASERVICE_CAMERA)) { - addRefCount(); + DirectShowUtils::CoInitializeIfNeeded(); return new DSCameraService; } if (key == QLatin1String(Q_MEDIASERVICE_MEDIAPLAYER)) { - addRefCount(); + DirectShowUtils::CoInitializeIfNeeded(); return new DirectShowPlayerService; } @@ -105,7 +93,7 @@ QMediaService* DSServicePlugin::create(QString const& key) void DSServicePlugin::release(QMediaService *service) { delete service; - releaseRefCount(); + DirectShowUtils::CoUninitializeIfNeeded(); } QMediaServiceProviderHint::Features DSServicePlugin::supportedFeatures( @@ -119,9 +107,9 @@ QMediaServiceProviderHint::Features DSServicePlugin::supportedFeatures( QByteArray DSServicePlugin::defaultDevice(const QByteArray &service) const { if (service == Q_MEDIASERVICE_CAMERA) { - addRefCount(); + DirectShowUtils::CoInitializeIfNeeded(); const QList<DSVideoDeviceInfo> &devs = DSVideoDeviceControl::availableDevices(); - releaseRefCount(); + DirectShowUtils::CoUninitializeIfNeeded(); if (!devs.isEmpty()) return devs.first().first; } @@ -133,9 +121,9 @@ QList<QByteArray> DSServicePlugin::devices(const QByteArray &service) const QList<QByteArray> result; if (service == Q_MEDIASERVICE_CAMERA) { - addRefCount(); + DirectShowUtils::CoInitializeIfNeeded(); const QList<DSVideoDeviceInfo> &devs = DSVideoDeviceControl::availableDevices(); - releaseRefCount(); + DirectShowUtils::CoUninitializeIfNeeded(); for (const DSVideoDeviceInfo &info : devs) result.append(info.first); } @@ -146,9 +134,9 @@ QList<QByteArray> DSServicePlugin::devices(const QByteArray &service) const QString DSServicePlugin::deviceDescription(const QByteArray &service, const QByteArray &device) { if (service == Q_MEDIASERVICE_CAMERA) { - addRefCount(); + DirectShowUtils::CoInitializeIfNeeded(); const QList<DSVideoDeviceInfo> &devs = DSVideoDeviceControl::availableDevices(); - releaseRefCount(); + DirectShowUtils::CoUninitializeIfNeeded(); for (const DSVideoDeviceInfo &info : devs) { if (info.first == device) return info.second; diff --git a/src/plugins/directshow/player/directshowplayerservice.cpp b/src/plugins/directshow/player/directshowplayerservice.cpp index def18be74..f5899cb6a 100644 --- a/src/plugins/directshow/player/directshowplayerservice.cpp +++ b/src/plugins/directshow/player/directshowplayerservice.cpp @@ -327,6 +327,7 @@ void DirectShowPlayerService::load(const QMediaContent &media, QIODevice *stream 0x36b73882, 0xc2c8, 0x11cf, {0x8b, 0x46, 0x00, 0x80, 0x5f, 0x6c, 0xef, 0x60} }; m_graphStatus = Loading; + DirectShowUtils::CoInitializeIfNeeded(); m_graph = com_new<IFilterGraph2>(CLSID_FilterGraph, iid_IFilterGraph2); m_graphBuilder = com_new<ICaptureGraphBuilder2>(CLSID_CaptureGraphBuilder2, IID_ICaptureGraphBuilder2); @@ -664,6 +665,7 @@ void DirectShowPlayerService::releaseGraph() ::SetEvent(m_taskHandle); m_loop->wait(&m_mutex); + DirectShowUtils::CoUninitializeIfNeeded(); } } |