Added support for XvImage shm based video frames to gstreamer backend.

Gstreamer backend will use XvShmPutImage without copying frames data
if possible with overlay video output, and provide XvImage based
video frames to renderer video output surface.

1 files changed, 276 insertions, 0 deletions

diff --git a/src/plugins/mediaservices/gstreamer/qgstxvimagebuffer.cpp b/src/plugins/mediaservices/gstreamer/qgstxvimagebuffer.cpp
new file mode 100644
index 0000000..0e47c98
--- /dev/null
+++ b/src/plugins/mediaservices/gstreamer/qgstxvimagebuffer.cpp
@@ -0,0 +1,276 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtCore/qdebug.h>
+#include <QtCore/qthread.h>
+#include <QtCore/qvariant.h>
+#include <QtGui/qx11info_x11.h>
+
+#include "qgstxvimagebuffer.h"
+#include "qvideosurfacegstsink.h"
+
+GstBufferClass *QGstXvImageBuffer::parent_class = NULL;
+
+GType QGstXvImageBuffer::get_type(void)
+{
+    static GType buffer_type = 0;
+
+    if (buffer_type == 0) {
+        static const GTypeInfo buffer_info = {
+            sizeof (GstBufferClass),
+            NULL,
+            NULL,
+            QGstXvImageBuffer::class_init,
+            NULL,
+            NULL,
+            sizeof(QGstXvImageBuffer),
+            0,
+            (GInstanceInitFunc)QGstXvImageBuffer::buffer_init,
+            NULL
+        };
+        buffer_type = g_type_register_static(GST_TYPE_BUFFER,
+                                             "QGstXvImageBuffer", &buffer_info, GTypeFlags(0));
+    }
+    return buffer_type;
+}
+
+void QGstXvImageBuffer::class_init(gpointer g_class, gpointer class_data)
+{
+    Q_UNUSED(class_data);
+    GST_MINI_OBJECT_CLASS(g_class)->finalize =
+            (GstMiniObjectFinalizeFunction)buffer_finalize;
+    parent_class = (GstBufferClass*)g_type_class_peek_parent(g_class);
+}
+
+void QGstXvImageBuffer::buffer_init(QGstXvImageBuffer *xvImage, gpointer g_class)
+{
+    Q_UNUSED(g_class);
+    xvImage->pool = 0;
+    xvImage->shmInfo.shmaddr = ((char *) -1);
+    xvImage->shmInfo.shmid = -1;
+    xvImage->markedForDeletion = false;
+}
+
+void QGstXvImageBuffer::buffer_finalize(QGstXvImageBuffer * xvImage)
+{
+    if (xvImage->pool) {
+        if (xvImage->markedForDeletion)
+            xvImage->pool->destroyBuffer(xvImage);
+        else
+            xvImage->pool->recycleBuffer(xvImage);
+    }
+}
+
+
+QGstXvImageBufferPool::QGstXvImageBufferPool(QObject *parent)
+    :QObject(parent)
+{
+}
+
+QGstXvImageBufferPool::~QGstXvImageBufferPool()
+{
+}
+
+bool QGstXvImageBufferPool::isFormatSupported(const QVideoSurfaceFormat &surfaceFormat)
+{
+    bool ok = true;
+    surfaceFormat.property("portId").toULongLong(&ok);
+    if (!ok)
+        return false;
+
+    int xvFormatId = surfaceFormat.property("xvFormatId").toInt(&ok);
+    if (!ok || xvFormatId < 0)
+        return false;
+
+    int dataSize = surfaceFormat.property("dataSize").toInt(&ok);
+    if (!ok || dataSize<=0)
+        return false;
+
+    return true;
+}
+
+QGstXvImageBuffer *QGstXvImageBufferPool::takeBuffer(const QVideoSurfaceFormat &format, GstCaps *caps)
+{
+    m_poolMutex.lock();
+
+    m_caps = caps;
+    if (format != m_format) {
+        doClear();
+        m_format = format;
+    }
+
+
+    if (m_pool.isEmpty()) {
+        //qDebug() << "QGstXvImageBufferPool::takeBuffer: no buffer available, allocate the new one";
+        if (QThread::currentThread() == thread()) {
+            m_poolMutex.unlock();
+            queuedAlloc();
+            m_poolMutex.lock();
+        } else {
+            QMetaObject::invokeMethod(this, "queuedAlloc", Qt::QueuedConnection);
+            m_allocWaitCondition.wait(&m_poolMutex, 300);
+        }
+    }
+    QGstXvImageBuffer *res = 0;
+
+    if (!m_pool.isEmpty()) {
+        res = m_pool.takeLast();
+    }
+
+    m_poolMutex.unlock();
+
+    return res;
+}
+
+void QGstXvImageBufferPool::queuedAlloc()
+{
+    QMutexLocker lock(&m_poolMutex);
+
+    Q_ASSERT(QThread::currentThread() == thread());
+
+    QGstXvImageBuffer *xvBuffer = (QGstXvImageBuffer *)gst_mini_object_new(QGstXvImageBuffer::get_type());
+
+    quint64 portId = m_format.property("portId").toULongLong();
+    int xvFormatId = m_format.property("xvFormatId").toInt();
+
+    xvBuffer->xvImage = XvShmCreateImage(
+            QX11Info::display(),
+            portId,
+            xvFormatId,
+            0,
+            m_format.frameWidth(),
+            m_format.frameHeight(),
+            &xvBuffer->shmInfo
+            );
+
+    if (!xvBuffer->xvImage) {
+        qDebug() << "QGstXvImageBufferPool: XvShmCreateImage failed";
+        m_allocWaitCondition.wakeOne();
+        return;
+    }
+
+    xvBuffer->shmInfo.shmid = shmget(IPC_PRIVATE, xvBuffer->xvImage->data_size, IPC_CREAT | 0777);
+    xvBuffer->shmInfo.shmaddr = xvBuffer->xvImage->data = (char*)shmat(xvBuffer->shmInfo.shmid, 0, 0);
+    xvBuffer->shmInfo.readOnly = False;
+
+    if (!XShmAttach(QX11Info::display(), &xvBuffer->shmInfo)) {
+        qDebug() << "QGstXvImageBufferPool: XShmAttach failed";
+        m_allocWaitCondition.wakeOne();
+        return;
+    }
+
+    shmctl (xvBuffer->shmInfo.shmid, IPC_RMID, NULL);
+
+    xvBuffer->pool = this;
+    GST_MINI_OBJECT_CAST(xvBuffer)->flags = 0;
+    gst_buffer_set_caps(GST_BUFFER_CAST(xvBuffer), m_caps);
+    GST_BUFFER_DATA(xvBuffer) = (uchar*)xvBuffer->xvImage->data;
+    GST_BUFFER_SIZE(xvBuffer) = xvBuffer->xvImage->data_size;
+
+    m_allBuffers.append(xvBuffer);
+    m_pool.append(xvBuffer);
+
+    m_allocWaitCondition.wakeOne();
+}
+
+
+void QGstXvImageBufferPool::clear()
+{
+    QMutexLocker lock(&m_poolMutex);
+    doClear();
+}
+
+void QGstXvImageBufferPool::doClear()
+{
+    foreach (QGstXvImageBuffer *xvBuffer, m_allBuffers) {
+        xvBuffer->markedForDeletion = true;
+    }
+    m_allBuffers.clear();
+
+    foreach (QGstXvImageBuffer *xvBuffer, m_pool) {
+        gst_buffer_unref(GST_BUFFER(xvBuffer));
+    }
+    m_pool.clear();
+
+    m_format = QVideoSurfaceFormat();
+}
+
+void QGstXvImageBufferPool::queuedDestroy()
+{
+    QMutexLocker lock(&m_destroyMutex);
+
+    foreach(XvShmImage xvImage, m_imagesToDestroy) {
+        if (xvImage.shmInfo.shmaddr != ((void *) -1)) {
+            XShmDetach(QX11Info::display(), &xvImage.shmInfo);
+            XSync(QX11Info::display(), false);
+
+            shmdt(xvImage.shmInfo.shmaddr);
+        }
+
+        if (xvImage.xvImage)
+            XFree(xvImage.xvImage);
+    }
+
+    m_imagesToDestroy.clear();
+
+    XSync(QX11Info::display(), false);
+}
+
+void QGstXvImageBufferPool::recycleBuffer(QGstXvImageBuffer *xvBuffer)
+{
+    QMutexLocker lock(&m_poolMutex);
+    gst_buffer_ref(GST_BUFFER_CAST(xvBuffer));
+    m_pool.append(xvBuffer);
+}
+
+void QGstXvImageBufferPool::destroyBuffer(QGstXvImageBuffer *xvBuffer)
+{
+    XvShmImage imageToDestroy;
+    imageToDestroy.xvImage = xvBuffer->xvImage;
+    imageToDestroy.shmInfo = xvBuffer->shmInfo;
+
+    m_destroyMutex.lock();
+    m_imagesToDestroy.append(imageToDestroy);
+    m_destroyMutex.unlock();
+
+    if (m_imagesToDestroy.size() == 1)
+        QMetaObject::invokeMethod(this, "queuedDestroy", Qt::QueuedConnection);
+}