diff options
| -rw-r--r-- | examples/audiolevels/audiolevelsiodevice.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/examples/audiolevels/audiolevelsiodevice.cpp b/examples/audiolevels/audiolevelsiodevice.cpp index 46e5aadb..2e36787f 100644 --- a/examples/audiolevels/audiolevelsiodevice.cpp +++ b/examples/audiolevels/audiolevelsiodevice.cpp @@ -47,10 +47,12 @@ qint64 AudioLevelsIODevice::writeData(const char *data, qint64 maxSize) int rowSize = qMin((newDataSize + oldRow->size()), maxRowSize); QBarDataRow *row = new QBarDataRow(rowSize); + int bottom = qMax(0, (newDataSize - rowSize)); // Insert data in reverse order, so that newest data is always at the front of the row - for (int i = newDataSize - 1; i >= 0; i--) - (*row)[i].setValue(((quint8)data[resolution * i] - 128) / 2.0); + int index = 0; + for (int i = newDataSize - 1; i >= bottom; i--) + (*row)[index++].setValue(((quint8)data[resolution * i] - 128) / 2.0); // Append old data to new row for (int i = newDataSize; i < rowSize; i++) |