merged probe functions into decoder class

app/decoder/decoder.cpp

@@ -20,6 +20,12 @@
 
 #include "decoder.h"
 
+#include <QCoreApplication>
+#include <QDebug>
+#include <QFileInfo>
+
+#include "decoder/ffmpeg/ffmpegdecoder.h"
+
 Decoder::Decoder() :
   open_(false),
   stream_(nullptr)
@@ -47,3 +53,99 @@ void Decoder::set_stream(const Stream *fs)
 
   stream_ = fs;
 }
+
+/*
+ * DECODER STATIC PUBLIC MEMBERS
+ */
+
+QVector<Decoder*> ReceiveListOfAllDecoders() {
+  QVector<Decoder*> decoders;
+
+  decoders.append(new FFmpegDecoder());
+
+  return decoders;
+}
+
+void FreeListOfDecoders(const QVector<Decoder*>& decoders, Decoder* except = nullptr) {
+  foreach (Decoder* d, decoders) {
+    if (except == nullptr || except != d) {
+      delete d;
+    }
+  }
+}
+
+bool Decoder::ProbeMedia(Footage *f)
+{
+  // Check for a valid filename
+  if (f->filename().isEmpty()) {
+    qWarning() << QCoreApplication::translate("ProbeMedia", "Tried to probe media with an empty filename");
+    return false;
+  }
+
+  // Check file exists
+  if (!QFileInfo::exists(f->filename())) {
+    qWarning() << QCoreApplication::translate("ProbeMedia", "Tried to probe file that doesn't exist");
+    return false;
+  }
+
+  // Reset Footage state for probing
+  f->Clear();
+
+  // Create list to iterate through
+  QVector<Decoder*> decoder_list = ReceiveListOfAllDecoders();
+
+  Decoder* found_decoder = nullptr;
+
+  // Pass Footage through each Decoder's probe function
+  for (int i=0;i<decoder_list.size();i++) {
+
+    Decoder* decoder = decoder_list.at(i);
+
+    if (decoder->Probe(f)) {
+
+      // FIXME: Cache the results so we don't have to probe if this media is added a second time
+
+      found_decoder = decoder;
+      break;
+    }
+  }
+
+  if (found_decoder == nullptr) {
+    // We aren't able to use this Footage
+    f->set_status(Footage::kInvalid);
+    f->set_decoder(QString());
+  } else {
+    // We found a Decoder, so we can set this media as valid
+    f->set_status(Footage::kReady);
+
+    // Attach the successful Decoder to this Footage object
+    f->set_decoder(found_decoder->id());
+  }
+
+  FreeListOfDecoders(decoder_list);
+
+  return (found_decoder != nullptr);
+}
+
+Decoder *Decoder::CreateFromID(const QString &id)
+{
+  if (id.isEmpty()) {
+    return nullptr;
+  }
+
+  // Create list to iterate through
+  QVector<Decoder*> decoder_list = ReceiveListOfAllDecoders();
+
+  Decoder* found_decoder = nullptr;
+
+  foreach (Decoder* d, decoder_list) {
+    if (d->id() == id) {
+      found_decoder = d;
+      break;
+    }
+  }
+
+  FreeListOfDecoders(decoder_list, found_decoder);
+
+  return found_decoder;
+}