export: fixed many export formats including still image and image sequence export

Still incomplete, but does a lot towards #1345

app/codec/oiio/oiioencoder.cpp

@@ -0,0 +1,75 @@
+/***
+
+  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 "oiioencoder.h"
+
+#include "common/oiioutils.h"
+
+namespace olive {
+
+OIIOEncoder::OIIOEncoder(const EncodingParams &params) :
+  Encoder(params)
+{
+
+}
+
+bool OIIOEncoder::Open()
+{
+  return true;
+}
+
+bool OIIOEncoder::WriteFrame(FramePtr frame, rational time)
+{
+  std::string filename = GetFilenameForFrame(time).toStdString();
+
+  auto output = OIIO::ImageOutput::create(filename);
+  if (!output) {
+    return false;
+  }
+
+  OIIO::TypeDesc type = OIIOUtils::GetOIIOBaseTypeFromFormat(frame->format());
+  OIIO::ImageSpec spec(frame->width(), frame->height(), frame->channel_count(), type);
+
+  if (!output->open(filename, spec)) {
+    return false;
+  }
+
+  if (!output->write_image(type, frame->data(), OIIO::AutoStride, frame->linesize_bytes())) {
+    return false;
+  }
+
+  if (!output->close()) {
+    return false;
+  }
+
+  return true;
+}
+
+void OIIOEncoder::WriteAudio(AudioParams pcm_info, QIODevice *file)
+{
+  // Do nothing
+}
+
+void OIIOEncoder::Close()
+{
+  // Do nothing
+}
+
+}