moved things around and started rewriting render backend

app/codec/samplebuffer.cpp

@@ -38,6 +38,11 @@ SampleBufferPtr SampleBuffer::Create()
   return std::make_shared<SampleBuffer>();
 }
 
+SampleBufferPtr SampleBuffer::CreateAllocated(const AudioParams &audio_params, const rational &length)
+{
+  return CreateAllocated(audio_params, audio_params.time_to_samples(length));
+}
+
 SampleBufferPtr SampleBuffer::CreateAllocated(const AudioParams &audio_params, int samples_per_channel)
 {
   SampleBufferPtr buffer = Create();

app/codec/samplebuffer.h

@@ -46,6 +46,7 @@ public:
   virtual ~SampleBuffer();
 
   static SampleBufferPtr Create();
+  static SampleBufferPtr CreateAllocated(const AudioParams& audio_params, const rational& length);
   static SampleBufferPtr CreateAllocated(const AudioParams& audio_params, int samples_per_channel);
   static SampleBufferPtr CreateFromPackedData(const AudioParams& audio_params, const QByteArray& bytes);