allow setting of pixel format/ocio method/sample format in preferences

Implementation isn't perfect yet, viewer/renderer doesn't update yet when
the preference is changed so a sequence needs to be re-opened for the change to
take effect.

app/audio/sampleformat.cpp

@@ -1 +1,36 @@
 #include "sampleformat.h"
+
+#include "core.h"
+
+QString SampleFormat::GetSampleFormatName(const SampleFormat::Format &f)
+{
+  switch (f) {
+  case SAMPLE_FMT_U8:
+    return tr("Unsigned 8-bit");
+  case SAMPLE_FMT_S16:
+    return tr("Signed 16-bit");
+  case SAMPLE_FMT_S32:
+    return tr("Signed 32-bit");
+  case SAMPLE_FMT_S64:
+    return tr("Signed 64-bit");
+  case SAMPLE_FMT_FLT:
+    return tr("32-bit Float");
+  case SAMPLE_FMT_DBL:
+    return tr("64-bit Float");
+  case SAMPLE_FMT_COUNT:
+  case SAMPLE_FMT_INVALID:
+    break;
+  }
+
+  return tr("Invalid");
+}
+
+SampleFormat::Format SampleFormat::GetConfiguredFormatForMode(RenderMode::Mode mode)
+{
+  return static_cast<SampleFormat::Format>(Core::GetPreferenceForRenderMode(mode, QStringLiteral("SampleFormat")).toInt());
+}
+
+void SampleFormat::SetConfiguredFormatForMode(RenderMode::Mode mode, SampleFormat::Format format)
+{
+  Core::SetPreferenceForRenderMode(mode, QStringLiteral("SampleFormat"), format);
+}