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-rw-r--r--demos/spectrum/app/waveform.cpp120
1 files changed, 69 insertions, 51 deletions
diff --git a/demos/spectrum/app/waveform.cpp b/demos/spectrum/app/waveform.cpp
index 1f7d315efe..bd854c0472 100644
--- a/demos/spectrum/app/waveform.cpp
+++ b/demos/spectrum/app/waveform.cpp
@@ -44,12 +44,18 @@
#include <QResizeEvent>
#include <QDebug>
-
-Waveform::Waveform(const QByteArray &buffer, QWidget *parent)
+//#define PAINT_EVENT_TRACE
+#ifdef PAINT_EVENT_TRACE
+# define WAVEFORM_PAINT_DEBUG qDebug()
+#else
+# define WAVEFORM_PAINT_DEBUG nullDebug()
+#endif
+
+Waveform::Waveform(QWidget *parent)
: QWidget(parent)
- , m_buffer(buffer)
- , m_dataLength(0)
- , m_position(0)
+ , m_bufferPosition(0)
+ , m_bufferLength(0)
+ , m_audioPosition(0)
, m_active(false)
, m_tileLength(0)
, m_tileArrayStart(0)
@@ -72,19 +78,19 @@ void Waveform::paintEvent(QPaintEvent * /*event*/)
painter.fillRect(rect(), Qt::black);
if (m_active) {
- WAVEFORM_DEBUG << "Waveform::paintEvent"
- << "windowPosition" << m_windowPosition
- << "windowLength" << m_windowLength;
+ WAVEFORM_PAINT_DEBUG << "Waveform::paintEvent"
+ << "windowPosition" << m_windowPosition
+ << "windowLength" << m_windowLength;
qint64 pos = m_windowPosition;
const qint64 windowEnd = m_windowPosition + m_windowLength;
int destLeft = 0;
int destRight = 0;
while (pos < windowEnd) {
const TilePoint point = tilePoint(pos);
- WAVEFORM_DEBUG << "Waveform::paintEvent" << "pos" << pos
- << "tileIndex" << point.index
- << "positionOffset" << point.positionOffset
- << "pixelOffset" << point.pixelOffset;
+ WAVEFORM_PAINT_DEBUG << "Waveform::paintEvent" << "pos" << pos
+ << "tileIndex" << point.index
+ << "positionOffset" << point.positionOffset
+ << "pixelOffset" << point.pixelOffset;
if (point.index != NullIndex) {
const Tile &tile = m_tiles[point.index];
@@ -104,9 +110,9 @@ void Waveform::paintEvent(QPaintEvent * /*event*/)
sourceRect.setLeft(point.pixelOffset);
sourceRect.setRight(sourceRight);
- WAVEFORM_DEBUG << "Waveform::paintEvent" << "tileIndex" << point.index
- << "source" << point.pixelOffset << sourceRight
- << "dest" << destLeft << destRight;
+ WAVEFORM_PAINT_DEBUG << "Waveform::paintEvent" << "tileIndex" << point.index
+ << "source" << point.pixelOffset << sourceRight
+ << "dest" << destLeft << destRight;
painter.drawPixmap(destRect, *tile.pixmap, sourceRect);
@@ -114,25 +120,25 @@ void Waveform::paintEvent(QPaintEvent * /*event*/)
if (point.index < m_tiles.count()) {
pos = tilePosition(point.index + 1);
- WAVEFORM_DEBUG << "Waveform::paintEvent" << "pos ->" << pos;
+ WAVEFORM_PAINT_DEBUG << "Waveform::paintEvent" << "pos ->" << pos;
} else {
// Reached end of tile array
- WAVEFORM_DEBUG << "Waveform::paintEvent" << "reached end of tile array";
+ WAVEFORM_PAINT_DEBUG << "Waveform::paintEvent" << "reached end of tile array";
break;
}
} else {
// Passed last tile which is painted
- WAVEFORM_DEBUG << "Waveform::paintEvent" << "tile" << point.index << "not painted";
+ WAVEFORM_PAINT_DEBUG << "Waveform::paintEvent" << "tile" << point.index << "not painted";
break;
}
} else {
// pos is past end of tile array
- WAVEFORM_DEBUG << "Waveform::paintEvent" << "pos" << pos << "past end of tile array";
+ WAVEFORM_PAINT_DEBUG << "Waveform::paintEvent" << "pos" << pos << "past end of tile array";
break;
}
}
- WAVEFORM_DEBUG << "Waveform::paintEvent" << "final pos" << pos << "final x" << destRight;
+ WAVEFORM_PAINT_DEBUG << "Waveform::paintEvent" << "final pos" << pos << "final x" << destRight;
}
}
@@ -146,7 +152,6 @@ void Waveform::initialize(const QAudioFormat &format, qint64 audioBufferSize, qi
{
WAVEFORM_DEBUG << "Waveform::initialize"
<< "audioBufferSize" << audioBufferSize
- << "m_buffer.size()" << m_buffer.size()
<< "windowDurationUs" << windowDurationUs;
reset();
@@ -186,8 +191,9 @@ void Waveform::reset()
{
WAVEFORM_DEBUG << "Waveform::reset";
- m_dataLength = 0;
- m_position = 0;
+ m_bufferPosition = 0;
+ m_buffer = QByteArray();
+ m_audioPosition = 0;
m_format = QAudioFormat();
m_active = false;
deletePixmaps();
@@ -198,30 +204,31 @@ void Waveform::reset()
m_windowLength = 0;
}
-void Waveform::dataLengthChanged(qint64 length)
+void Waveform::bufferChanged(qint64 position, qint64 length, const QByteArray &buffer)
{
- WAVEFORM_DEBUG << "Waveform::dataLengthChanged" << length;
- const qint64 oldLength = m_dataLength;
- m_dataLength = length;
-
- if (m_active) {
- if (m_dataLength < oldLength)
- positionChanged(m_dataLength);
- else
- paintTiles();
- }
+ WAVEFORM_DEBUG << "Waveform::bufferChanged"
+ << "audioPosition" << m_audioPosition
+ << "bufferPosition" << position
+ << "bufferLength" << length;
+ m_bufferPosition = position;
+ m_bufferLength = length;
+ m_buffer = buffer;
+ paintTiles();
}
-void Waveform::positionChanged(qint64 position)
+void Waveform::audioPositionChanged(qint64 position)
{
- WAVEFORM_DEBUG << "Waveform::positionChanged" << position;
-
- if (position + m_windowLength > m_dataLength)
- position = m_dataLength - m_windowLength;
-
- m_position = position;
-
- setWindowPosition(position);
+ WAVEFORM_DEBUG << "Waveform::audioPositionChanged"
+ << "audioPosition" << position
+ << "bufferPosition" << m_bufferPosition
+ << "bufferLength" << m_bufferLength;
+
+ if (position >= m_bufferPosition) {
+ if (position + m_windowLength > m_bufferPosition + m_bufferLength)
+ position = qMax(qint64(0), m_bufferPosition + m_bufferLength - m_windowLength);
+ m_audioPosition = position;
+ setWindowPosition(position);
+ }
}
void Waveform::deletePixmaps()
@@ -255,8 +262,6 @@ void Waveform::createPixmaps(const QSize &widgetSize)
m_tiles[i].pixmap = m_pixmaps[i];
m_tiles[i].painted = false;
}
-
- paintTiles();
}
void Waveform::setWindowPosition(qint64 position)
@@ -327,8 +332,9 @@ bool Waveform::paintTiles()
for (int i=0; i<m_tiles.count(); ++i) {
const Tile &tile = m_tiles[i];
if (!tile.painted) {
- const qint64 tileEnd = m_tileArrayStart + (i + 1) * m_tileLength;
- if (m_dataLength >= tileEnd) {
+ const qint64 tileStart = m_tileArrayStart + i * m_tileLength;
+ const qint64 tileEnd = tileStart + m_tileLength;
+ if (m_bufferPosition <= tileStart && m_bufferPosition + m_bufferLength >= tileEnd) {
paintTile(i);
updateRequired = true;
}
@@ -343,16 +349,23 @@ bool Waveform::paintTiles()
void Waveform::paintTile(int index)
{
- WAVEFORM_DEBUG << "Waveform::paintTile" << "index" << index;
-
const qint64 tileStart = m_tileArrayStart + index * m_tileLength;
- Q_ASSERT(m_dataLength >= tileStart + m_tileLength);
+
+ WAVEFORM_DEBUG << "Waveform::paintTile"
+ << "index" << index
+ << "bufferPosition" << m_bufferPosition
+ << "bufferLength" << m_bufferLength
+ << "start" << tileStart
+ << "end" << tileStart + m_tileLength;
+
+ Q_ASSERT(m_bufferPosition <= tileStart);
+ Q_ASSERT(m_bufferPosition + m_bufferLength >= tileStart + m_tileLength);
Tile &tile = m_tiles[index];
Q_ASSERT(!tile.painted);
const qint16* base = reinterpret_cast<const qint16*>(m_buffer.constData());
- const qint16* buffer = base + (tileStart / 2);
+ const qint16* buffer = base + ((tileStart - m_bufferPosition) / 2);
const int numSamples = m_tileLength / (2 * m_format.channels());
QPainter painter(tile.pixmap);
@@ -376,6 +389,11 @@ void Waveform::paintTile(int index)
for (int i=0; i<numSamples; ++i) {
const qint16* ptr = buffer + i * m_format.channels();
+
+ const int offset = reinterpret_cast<const char*>(ptr) - m_buffer.constData();
+ Q_ASSERT(offset >= 0);
+ Q_ASSERT(offset < m_bufferLength);
+
const qint16 pcmValue = *ptr;
const qreal realValue = pcmToReal(pcmValue);
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