implemented core subtitle support

app/node/block/CMakeLists.txt

@@ -16,6 +16,7 @@
 
 add_subdirectory(clip)
 add_subdirectory(gap)
+add_subdirectory(subtitle)
 add_subdirectory(transition)
 
 set(OLIVE_SOURCES

app/node/block/clip/clip.cpp

@@ -26,9 +26,11 @@ namespace olive {
 
 const QString ClipBlock::kBufferIn = QStringLiteral("buffer_in");
 
-ClipBlock::ClipBlock()
+ClipBlock::ClipBlock(bool create_buffer_in)
 {
-  AddInput(kBufferIn, NodeValue::kNone, InputFlags(kInputFlagNotKeyframable));
+  if (create_buffer_in) {
+    AddInput(kBufferIn, NodeValue::kNone, InputFlags(kInputFlagNotKeyframable));
+  }
 }
 
 Node *ClipBlock::copy() const
@@ -108,7 +110,9 @@ void ClipBlock::Retranslate()
 {
   super::Retranslate();
 
-  SetInputName(kBufferIn, tr("Buffer"));
+  if (HasInputWithID(kBufferIn)) {
+    SetInputName(kBufferIn, tr("Buffer"));
+  }
 }
 
 void ClipBlock::Hash(const QString &out, QCryptographicHash &hash, const rational &time, const VideoParams &video_params) const

app/node/block/clip/clip.h

@@ -32,7 +32,7 @@ class ClipBlock : public Block
 {
   Q_OBJECT
 public:
-  ClipBlock();
+  ClipBlock(bool create_buffer_in = true);
 
   NODE_DEFAULT_DESTRUCTOR(ClipBlock)
 

app/node/block/subtitle/CMakeLists.txt

@@ -0,0 +1,22 @@
+# Olive - Non-Linear Video Editor
+# Copyright (C) 2021 Olive Team
+#
+# 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, either version 3 of the License, or
+# (at your option) any later version.
+#
+# 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 <http://www.gnu.org/licenses/>.
+
+set(OLIVE_SOURCES
+  ${OLIVE_SOURCES}
+  node/block/subtitle/subtitle.cpp
+  node/block/subtitle/subtitle.h
+  PARENT_SCOPE
+)

app/node/block/subtitle/subtitle.cpp

@@ -0,0 +1,62 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2021 Olive Team
+
+  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, either version 3 of the License, or
+  (at your option) any later version.
+
+  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 <http://www.gnu.org/licenses/>.
+
+***/
+
+#include "subtitle.h"
+
+namespace olive {
+
+#define super ClipBlock
+
+const QString SubtitleBlock::kTextIn = QStringLiteral("text_in");
+
+SubtitleBlock::SubtitleBlock() :
+  super(false)
+{
+  AddInput(kTextIn, NodeValue::kText, InputFlags(kInputFlagNotConnectable | kInputFlagNotKeyframable));
+}
+
+Node *SubtitleBlock::copy() const
+{
+  return new SubtitleBlock();
+}
+
+QString SubtitleBlock::Name() const
+{
+  return tr("Subtitle");
+}
+
+QString SubtitleBlock::id() const
+{
+  return QStringLiteral("org.olivevideoeditor.Olive.subtitle");
+}
+
+QString SubtitleBlock::Description() const
+{
+  return tr("A time-based node representing a single subtitle element for a certain period of time.");
+}
+
+void SubtitleBlock::Retranslate()
+{
+  super::Retranslate();
+
+  SetInputName(kTextIn, tr("Text"));
+}
+
+}

app/node/block/subtitle/subtitle.h

@@ -0,0 +1,60 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2021 Olive Team
+
+  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, either version 3 of the License, or
+  (at your option) any later version.
+
+  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 <http://www.gnu.org/licenses/>.
+
+***/
+
+#ifndef SUBTITLEBLOCK_H
+#define SUBTITLEBLOCK_H
+
+#include "node/block/clip/clip.h"
+
+namespace olive {
+
+class SubtitleBlock : public ClipBlock
+{
+  Q_OBJECT
+public:
+  SubtitleBlock();
+
+  NODE_DEFAULT_DESTRUCTOR(SubtitleBlock)
+
+  virtual Node* copy() const override;
+
+  virtual QString Name() const override;
+  virtual QString id() const override;
+  virtual QString Description() const override;
+
+  virtual void Retranslate() override;
+
+  static const QString kTextIn;
+
+  QString GetText() const
+  {
+    return GetStandardValue(kTextIn).toString();
+  }
+
+  void SetText(const QString &text)
+  {
+    SetStandardValue(kTextIn, text);
+  }
+
+};
+
+}
+
+#endif // SUBTITLEBLOCK_H

app/node/factory.cpp

@@ -26,6 +26,7 @@
 #include "audio/volume/volume.h"
 #include "block/clip/clip.h"
 #include "block/gap/gap.h"
+#include "block/subtitle/subtitle.h"
 #include "block/transition/crossdissolve/crossdissolvetransition.h"
 #include "block/transition/diptocolor/diptocolortransition.h"
 #include "distort/crop/cropdistortnode.h"
@@ -236,6 +237,8 @@ Node *NodeFactory::CreateFromFactoryIndex(const NodeFactory::InternalID &id)
     return new ValueNode();
   case kTimeRemapNode:
     return new TimeRemapNode();
+  case kSubtitleBlock:
+    return new SubtitleBlock();
 
   case kInternalNodeCount:
     break;

app/node/factory.h

@@ -58,6 +58,7 @@ public:
     kProjectSequence,
     kValueNode,
     kTimeRemapNode,
+    kSubtitleBlock,
 
     // Count value
     kInternalNodeCount