Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 175 insertions, 0 deletions

diff --git a/avmedia/source/gstreamer/gstframegrabber.cxx b/avmedia/source/gstreamer/gstframegrabber.cxx
new file mode 100644
index 000000000..ece799d87
--- /dev/null
+++ b/avmedia/source/gstreamer/gstframegrabber.cxx
@@ -0,0 +1,175 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include "gstframegrabber.hxx"
+#include "gstplayer.hxx"
+
+#include <cppuhelper/supportsservice.hxx>
+
+#include <gst/gstbuffer.h>
+#include <gst/video/video.h>
+#include <gst/video/gstvideosink.h>
+#include <o3tl/safeint.hxx>
+#include <vcl/graph.hxx>
+#include <vcl/BitmapTools.hxx>
+
+#include <string>
+
+constexpr OUStringLiteral AVMEDIA_GST_FRAMEGRABBER_IMPLEMENTATIONNAME = u"com.sun.star.comp.avmedia.FrameGrabber_GStreamer";
+constexpr OUStringLiteral AVMEDIA_GST_FRAMEGRABBER_SERVICENAME = u"com.sun.star.media.FrameGrabber_GStreamer";
+
+using namespace ::com::sun::star;
+
+namespace avmedia::gstreamer {
+
+void FrameGrabber::disposePipeline()
+{
+    if( mpPipeline != nullptr )
+    {
+        gst_element_set_state( mpPipeline, GST_STATE_NULL );
+        g_object_unref( G_OBJECT( mpPipeline ) );
+        mpPipeline = nullptr;
+    }
+}
+
+FrameGrabber::FrameGrabber( std::u16string_view rURL )
+{
+    gchar *pPipelineStr;
+    pPipelineStr = g_strdup_printf(
+        "uridecodebin uri=%s ! videoconvert ! videoscale ! appsink "
+        "name=sink caps=\"video/x-raw,format=RGB,pixel-aspect-ratio=1/1\"",
+        OUStringToOString( rURL, RTL_TEXTENCODING_UTF8 ).getStr() );
+
+    GError *pError = nullptr;
+    mpPipeline = gst_parse_launch( pPipelineStr, &pError );
+    if( pError != nullptr) {
+        g_warning( "Failed to construct frame-grabber pipeline '%s'\n", pError->message );
+        g_error_free( pError );
+        disposePipeline();
+    }
+
+    if( mpPipeline ) {
+        // pre-roll
+        switch( gst_element_set_state( mpPipeline, GST_STATE_PAUSED ) ) {
+        case GST_STATE_CHANGE_FAILURE:
+        case GST_STATE_CHANGE_NO_PREROLL:
+            g_warning( "failure pre-rolling media" );
+            disposePipeline();
+            break;
+        default:
+            break;
+        }
+    }
+    if( mpPipeline &&
+        gst_element_get_state( mpPipeline, nullptr, nullptr, 5 * GST_SECOND ) == GST_STATE_CHANGE_FAILURE )
+        disposePipeline();
+}
+
+FrameGrabber::~FrameGrabber()
+{
+    disposePipeline();
+}
+
+rtl::Reference<FrameGrabber> FrameGrabber::create( std::u16string_view rURL )
+{
+    return new FrameGrabber( rURL );
+}
+
+uno::Reference< graphic::XGraphic > SAL_CALL FrameGrabber::grabFrame( double fMediaTime )
+{
+    uno::Reference< graphic::XGraphic > xRet;
+
+    if( !mpPipeline )
+        return xRet;
+
+    gint64 gst_position = llround( fMediaTime * GST_SECOND );
+    gst_element_seek_simple(
+        mpPipeline, GST_FORMAT_TIME,
+        GstSeekFlags(GST_SEEK_FLAG_KEY_UNIT | GST_SEEK_FLAG_FLUSH),
+        gst_position );
+
+    GstElement *pSink = gst_bin_get_by_name( GST_BIN( mpPipeline ), "sink" );
+    if( !pSink )
+        return xRet;
+
+    GstBuffer *pBuf = nullptr;
+    GstCaps *pCaps = nullptr;
+
+    // synchronously fetch the frame
+    GstSample *pSample = nullptr;
+    g_signal_emit_by_name( pSink, "pull-preroll", &pSample, nullptr );
+
+    if( pSample )
+    {
+        pBuf = gst_sample_get_buffer( pSample );
+        pCaps = gst_sample_get_caps( pSample );
+    }
+
+    // get geometry
+    int nWidth = 0, nHeight = 0;
+    if( !pCaps )
+        g_warning( "could not get snapshot format\n" );
+    else
+    {
+        GstStructure *pStruct = gst_caps_get_structure( pCaps, 0 );
+
+        /* we need to get the final caps on the buffer to get the size */
+        if( !gst_structure_get_int( pStruct, "width", &nWidth ) ||
+            !gst_structure_get_int( pStruct, "height", &nHeight ) )
+            nWidth = nHeight = 0;
+    }
+
+    if( pBuf && nWidth > 0 && nHeight > 0 &&
+        // sanity check the size
+        gst_buffer_get_size( pBuf ) >= o3tl::make_unsigned( nWidth * nHeight * 3 )
+        )
+    {
+        sal_uInt8 *pData = nullptr;
+        GstMapInfo aMapInfo;
+        gst_buffer_map( pBuf, &aMapInfo, GST_MAP_READ );
+        pData = aMapInfo.data;
+
+        int nStride = GST_ROUND_UP_4( nWidth * 3 );
+        BitmapEx aBmp = vcl::bitmap::CreateFromData(pData, nWidth, nHeight, nStride, vcl::PixelFormat::N24_BPP);
+
+        gst_buffer_unmap( pBuf, &aMapInfo );
+        xRet = Graphic( aBmp ).GetXGraphic();
+    }
+
+    return xRet;
+}
+
+OUString SAL_CALL FrameGrabber::getImplementationName(  )
+{
+    return AVMEDIA_GST_FRAMEGRABBER_IMPLEMENTATIONNAME;
+}
+
+sal_Bool SAL_CALL FrameGrabber::supportsService( const OUString& ServiceName )
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+uno::Sequence< OUString > SAL_CALL FrameGrabber::getSupportedServiceNames()
+{
+    return { AVMEDIA_GST_FRAMEGRABBER_SERVICENAME };
+}
+
+} // namespace
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */