import: safely handle unsupported files

Fixes #1191

app/codec/ffmpeg/ffmpegdecoder.cpp

@@ -477,14 +477,19 @@ bool FFmpegDecoder::Probe(Footage *f, const QAtomicInt* cancelled)
     // Retrieve metadata about the media
     avformat_find_stream_info(fmt_ctx, nullptr);
 
+    QVector<StreamPtr> streams(fmt_ctx->nb_streams);
+
     // Dump it into the Footage object
     for (unsigned int i=0;i<fmt_ctx->nb_streams;i++) {
 
       AVStream* avstream = fmt_ctx->streams[i];
 
+      // Find decoder for this stream, if it exists we can proceed
+      AVCodec* decoder = avcodec_find_decoder(avstream->codecpar->codec_id);
+
       StreamPtr str;
 
-      if (avstream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
+      if (avstream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && decoder) {
 
         bool image_is_still = false;
         rational pixel_aspect_ratio;
@@ -564,7 +569,7 @@ bool FFmpegDecoder::Probe(Footage *f, const QAtomicInt* cancelled)
 
         str = image_stream;
 
-      } else if (avstream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
+      } else if (avstream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && decoder) {
 
         // Create an audio stream object
         AudioStreamPtr audio_stream = std::make_shared<AudioStream>();
@@ -600,7 +605,7 @@ bool FFmpegDecoder::Probe(Footage *f, const QAtomicInt* cancelled)
           str->set_type(Stream::kAttachment);
           break;
         default:
-          // We should never realistically get here, but we make an "invalid" stream just in case
+          // Fallback to an unknown stream
           str->set_type(Stream::kUnknown);
           break;
         }
@@ -611,11 +616,27 @@ bool FFmpegDecoder::Probe(Footage *f, const QAtomicInt* cancelled)
       str->set_timebase(avstream->time_base);
       str->set_duration(avstream->duration);
 
-      f->add_stream(str);
+      streams[i] = str;
     }
 
-    // As long as we can open the container and retrieve information, this was a successful probe
-    result = true;
+    // Check if we could pick up any streams in this file
+    bool found_valid_streams = false;
+
+    foreach (StreamPtr stream, streams) {
+      if (stream->type() != Stream::kUnknown) {
+        found_valid_streams = true;
+        break;
+      }
+    }
+
+    if (found_valid_streams) {
+      // Copy streams over
+      foreach (StreamPtr stream, streams) {
+        f->add_stream(stream);
+      }
+
+      result = true;
+    }
   }
 
   // Free all memory
@@ -1330,6 +1351,7 @@ void FFmpegDecoderInstance::RemoveFirstFrame()
 
 FFmpegDecoderInstance::FFmpegDecoderInstance(const char *filename, int stream_index) :
   fmt_ctx_(nullptr),
+  codec_ctx_(nullptr),
   opts_(nullptr),
   scale_ctx_(nullptr),
   scale_divider_(0),

app/core.cpp

@@ -51,6 +51,7 @@
 #include "render/pixelformat.h"
 #include "render/shaderinfo.h"
 #include "task/project/import/import.h"
+#include "task/project/import/importerrordialog.h"
 #include "task/project/load/load.h"
 #include "task/project/save/save.h"
 #include "task/taskmanager.h"
@@ -473,7 +474,14 @@ void Core::AddOpenProjectFromTask(Task *task)
 
 void Core::ImportTaskComplete(Task* task)
 {
-  QUndoCommand *command = static_cast<ProjectImportTask*>(task)->GetCommand();
+  ProjectImportTask* import_task = static_cast<ProjectImportTask*>(task);
+
+  QUndoCommand *command = import_task->GetCommand();
+
+  if (import_task->HasInvalidFiles()) {
+    ProjectImportErrorDialog d(import_task->GetInvalidFiles(), main_window_);
+    d.exec();
+  }
 
   undo_stack_.pushIfHasChildren(command);
 }

app/task/project/import/CMakeLists.txt

@@ -18,5 +18,7 @@ set(OLIVE_SOURCES
   ${OLIVE_SOURCES}
   task/project/import/import.h
   task/project/import/import.cpp
+  task/project/import/importerrordialog.h
+  task/project/import/importerrordialog.cpp
   PARENT_SCOPE
 )

app/task/project/import/import.cpp

@@ -122,7 +122,10 @@ void ProjectImportTask::Import(Folder *folder, const QFileInfoList &import, int
 
       f->set_project(nullptr);
 
-      if (f->status() != Footage::kInvalid) {
+      if (f->status() == Footage::kInvalid) {
+        // Add to list so we can tell the user about it later
+        invalid_files_.append(file_info.absoluteFilePath());
+      } else {
         // Create undoable command that adds the items to the model
         new ProjectViewModel::AddItemCommand(model_,
                                              folder,

app/task/project/import/import.h

@@ -42,6 +42,16 @@ public:
     return command_;
   }
 
+  const QStringList& GetInvalidFiles() const
+  {
+    return invalid_files_;
+  }
+
+  bool HasInvalidFiles() const
+  {
+    return !invalid_files_.isEmpty();
+  }
+
 protected:
   virtual bool Run() override;
 
@@ -58,6 +68,8 @@ private:
 
   int file_count_;
 
+  QStringList invalid_files_;
+
 };
 
 OLIVE_NAMESPACE_EXIT

app/task/project/import/importerrordialog.cpp

@@ -0,0 +1,53 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2019 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 "importerrordialog.h"
+
+#include <QDialogButtonBox>
+#include <QLabel>
+#include <QListWidget>
+#include <QVBoxLayout>
+
+OLIVE_NAMESPACE_ENTER
+
+ProjectImportErrorDialog::ProjectImportErrorDialog(const QStringList& filenames, QWidget* parent) :
+  QDialog(parent)
+{
+  QVBoxLayout* layout = new QVBoxLayout(this);
+
+  setWindowTitle(tr("Import Error"));
+
+  layout->addWidget(new QLabel(tr("The following files failed to import. Olive likely does not "
+                                  "support their formats.")));
+
+  QListWidget* list_widget = new QListWidget();
+  foreach (const QString& s, filenames) {
+    list_widget->addItem(s);
+  }
+  layout->addWidget(list_widget);
+
+  QDialogButtonBox* buttons = new QDialogButtonBox();
+  buttons->setStandardButtons(QDialogButtonBox::Ok);
+  buttons->setCenterButtons(true);
+  connect(buttons, &QDialogButtonBox::accepted, this, &ProjectImportErrorDialog::accept);
+  layout->addWidget(buttons);
+}
+
+OLIVE_NAMESPACE_EXIT

app/task/project/import/importerrordialog.h

@@ -0,0 +1,40 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2019 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 PROJECTIMPORTERRORDIALOG_H
+#define PROJECTIMPORTERRORDIALOG_H
+
+#include <QDialog>
+
+#include "common/define.h"
+
+OLIVE_NAMESPACE_ENTER
+
+class ProjectImportErrorDialog : public QDialog
+{
+  Q_OBJECT
+public:
+  ProjectImportErrorDialog(const QStringList& filenames, QWidget* parent = nullptr);
+
+};
+
+OLIVE_NAMESPACE_EXIT
+
+#endif // PROJECTIMPORTERRORDIALOG_H