footage: check files for changes

app/render/rendercache.h

@@ -39,7 +39,18 @@ private:
 
 };
 
-using DecoderCache = RenderCache<Decoder::CodecStream, DecoderPtr>;
+struct DecoderPair {
+  DecoderPair()
+  {
+    decoder = nullptr;
+    last_modified = 0;
+  }
+
+  DecoderPtr decoder;
+  qint64 last_modified;
+};
+
+using DecoderCache = RenderCache<Decoder::CodecStream, DecoderPair>;
 using ShaderCache = RenderCache<QString, QVariant>;
 
 }

app/render/rendermanager.cpp

@@ -91,10 +91,10 @@ void RenderManager::ClearOldDecoders()
   qint64 min_age = QDateTime::currentMSecsSinceEpoch() - kDecoderMaximumInactivity;
 
   for (auto it=decoder_cache_->begin(); it!=decoder_cache_->end(); ) {
-    DecoderPtr decoder = it.value();
+    DecoderPair decoder = it.value();
 
-    if (decoder->GetLastAccessedTime() < min_age) {
-      decoder->Close();
+    if (decoder.decoder->GetLastAccessedTime() < min_age) {
+      decoder.decoder->Close();
       it = decoder_cache_->erase(it);
     } else {
       it++;

app/render/renderprocessor.cpp

@@ -187,13 +187,16 @@ DecoderPtr RenderProcessor::ResolveDecoderFromInput(const QString& decoder_id, c
 
   QMutexLocker locker(decoder_cache_->mutex());
 
-  DecoderPtr decoder = decoder_cache_->value(stream);
+  DecoderPair decoder = decoder_cache_->value(stream);
 
-  if (!decoder) {
+  qint64 file_last_modified = QFileInfo(stream.filename()).lastModified().toMSecsSinceEpoch();
+
+  if (!decoder.decoder || decoder.last_modified != file_last_modified) {
     // No decoder
-    decoder = Decoder::CreateFromID(decoder_id);
+    decoder.decoder = Decoder::CreateFromID(decoder_id);
+    decoder.last_modified = file_last_modified;
 
-    if (decoder->Open(stream)) {
+    if (decoder.decoder->Open(stream)) {
       decoder_cache_->insert(stream, decoder);
     } else {
       qWarning() << "Failed to open decoder for" << stream.filename()
@@ -202,7 +205,7 @@ DecoderPtr RenderProcessor::ResolveDecoderFromInput(const QString& decoder_id, c
     }
   }
 
-  return decoder;
+  return decoder.decoder;
 }
 
 void RenderProcessor::Process(RenderTicketPtr ticket, Renderer *render_ctx, StillImageCache *still_image_cache, DecoderCache *decoder_cache, ShaderCache *shader_cache, QVariant default_shader)