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/* -*- 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: */
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