renderer/decoder: use same background mechanism to conform audio as well

app/project/item/footage/audiostream.cpp

@@ -106,3 +106,27 @@ void AudioStream::clear_index()
   index_done_ = false;
   index_length_ = 0;
 }
+
+bool AudioStream::has_conformed_version(const AudioRenderingParams &params)
+{
+  QMutexLocker locker(&index_access_lock_);
+
+  foreach (const AudioRenderingParams& p, conformed_) {
+    if (p == params) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+void AudioStream::append_conformed_version(const AudioRenderingParams &params)
+{
+  {
+    QMutexLocker locker(&index_access_lock_);
+
+    conformed_.append(params);
+  }
+
+  emit ConformAppended(params);
+}

app/project/item/footage/audiostream.h

@@ -21,7 +21,10 @@
 #ifndef AUDIOSTREAM_H
 #define AUDIOSTREAM_H
 
+#include <QVector>
+
 #include "common/rational.h"
+#include "render/audioparams.h"
 #include "stream.h"
 
 /**
@@ -29,6 +32,7 @@
  */
 class AudioStream : public Stream
 {
+  Q_OBJECT
 public:
   AudioStream();
 
@@ -51,6 +55,12 @@ public:
 
   void clear_index();
 
+  bool has_conformed_version(const AudioRenderingParams& params);
+  void append_conformed_version(const AudioRenderingParams& params);
+
+signals:
+  void ConformAppended(const AudioRenderingParams& params);
+
 private:
   int channels_;
   uint64_t layout_;
@@ -60,6 +70,8 @@ private:
   rational index_length_;
   bool index_done_;
 
+  QVector<AudioRenderingParams> conformed_;
+
 };
 
 using AudioStreamPtr = std::shared_ptr<AudioStream>;