Fixing bug when loading ogg loop (fix #1295)

The ogg loop layers was empty because the samples are being appended to
the end of the buffer. The first samples are always zero and we see just
silence in the layers.

Now the samples are copied to the correct place in the buffer.

src/Common/file/OggFileReader.cpp

@@ -28,12 +28,22 @@ bool OggFileReader::read(const QString &filePath, SamplesBuffer &outBuffer, quin
     // decode and append decoded data in 'outBuffer'
     int decodedFrames = 0;
     const int MAX_SAMPLES_PER_DECODE = 1024;
+    bool append = outBuffer.getFrameLenght() == 0;
+    auto remaining = outBuffer.getFrameLenght();
     do
     {
         const auto &decodedBuffer = decoder.decode(MAX_SAMPLES_PER_DECODE);
         decodedFrames = decodedBuffer.getFrameLenght();
         if (!decodedBuffer.isEmpty()) {
-            outBuffer.append(decodedBuffer);
+            if (append) {
+                outBuffer.append(decodedBuffer);
+            }
+            else {
+                auto samplesToCopy = std::min(decodedBuffer.getFrameLenght(), remaining);
+                auto outBufferOffset = outBuffer.getFrameLenght() - remaining;
+                outBuffer.set(decodedBuffer, 0, samplesToCopy, outBufferOffset);
+                remaining -= samplesToCopy;
+            }
         }
     }
     while(decodedFrames > 0);