diff options
Diffstat (limited to 'examples/spectrum/app/waveform.cpp')
| -rw-r--r-- | examples/spectrum/app/waveform.cpp | 436 |
1 files changed, 0 insertions, 436 deletions
diff --git a/examples/spectrum/app/waveform.cpp b/examples/spectrum/app/waveform.cpp deleted file mode 100644 index fe44a4f..0000000 --- a/examples/spectrum/app/waveform.cpp +++ /dev/null @@ -1,436 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). -** All rights reserved. -** Contact: Nokia Corporation (qt-info@nokia.com) -** -** This file is part of the examples of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:BSD$ -** You may use this file under the terms of the BSD license as follows: -** -** "Redistribution and use in source and binary forms, with or without -** modification, are permitted provided that the following conditions are -** met: -** * Redistributions of source code must retain the above copyright -** notice, this list of conditions and the following disclaimer. -** * Redistributions in binary form must reproduce the above copyright -** notice, this list of conditions and the following disclaimer in -** the documentation and/or other materials provided with the -** distribution. -** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor -** the names of its contributors may be used to endorse or promote -** products derived from this software without specific prior written -** permission. -** -** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#include "waveform.h" -#include "utils.h" -#include <QPainter> -#include <QResizeEvent> -#include <QDebug> - -//#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_bufferPosition(0) - , m_bufferLength(0) - , m_audioPosition(0) - , m_active(false) - , m_tileLength(0) - , m_tileArrayStart(0) - , m_windowPosition(0) - , m_windowLength(0) -{ - setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed); - setMinimumHeight(50); -} - -Waveform::~Waveform() -{ - deletePixmaps(); -} - -void Waveform::paintEvent(QPaintEvent * /*event*/) -{ - QPainter painter(this); - - painter.fillRect(rect(), Qt::black); - - if (m_active) { - 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_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]; - if (tile.painted) { - const qint64 sectionLength = qMin((m_tileLength - point.positionOffset), - (windowEnd - pos)); - Q_ASSERT(sectionLength > 0); - - const int sourceRight = tilePixelOffset(point.positionOffset + sectionLength); - destRight = windowPixelOffset(pos - m_windowPosition + sectionLength); - - QRect destRect = rect(); - destRect.setLeft(destLeft); - destRect.setRight(destRight); - - QRect sourceRect(QPoint(), m_pixmapSize); - sourceRect.setLeft(point.pixelOffset); - sourceRect.setRight(sourceRight); - - WAVEFORM_PAINT_DEBUG << "Waveform::paintEvent" << "tileIndex" << point.index - << "source" << point.pixelOffset << sourceRight - << "dest" << destLeft << destRight; - - painter.drawPixmap(destRect, *tile.pixmap, sourceRect); - - destLeft = destRight; - - if (point.index < m_tiles.count()) { - pos = tilePosition(point.index + 1); - WAVEFORM_PAINT_DEBUG << "Waveform::paintEvent" << "pos ->" << pos; - } else { - // Reached end of tile array - WAVEFORM_PAINT_DEBUG << "Waveform::paintEvent" << "reached end of tile array"; - break; - } - } else { - // Passed last tile which is painted - WAVEFORM_PAINT_DEBUG << "Waveform::paintEvent" << "tile" << point.index << "not painted"; - break; - } - } else { - // pos is past end of tile array - WAVEFORM_PAINT_DEBUG << "Waveform::paintEvent" << "pos" << pos << "past end of tile array"; - break; - } - } - - WAVEFORM_PAINT_DEBUG << "Waveform::paintEvent" << "final pos" << pos << "final x" << destRight; - } -} - -void Waveform::resizeEvent(QResizeEvent *event) -{ - if (event->size() != event->oldSize()) - createPixmaps(event->size()); -} - -void Waveform::initialize(const QAudioFormat &format, qint64 audioBufferSize, qint64 windowDurationUs) -{ - WAVEFORM_DEBUG << "Waveform::initialize" - << "audioBufferSize" << audioBufferSize - << "windowDurationUs" << windowDurationUs; - - reset(); - - m_format = format; - - // Calculate tile size - m_tileLength = audioBufferSize; - - // Calculate window size - m_windowLength = audioLength(m_format, windowDurationUs); - - // Calculate number of tiles required - int nTiles; - if (m_tileLength > m_windowLength) { - nTiles = 2; - } else { - nTiles = m_windowLength / m_tileLength + 1; - if (m_windowLength % m_tileLength) - ++nTiles; - } - - WAVEFORM_DEBUG << "Waveform::initialize" - << "tileLength" << m_tileLength - << "windowLength" << m_windowLength - << "nTiles" << nTiles; - - m_pixmaps.fill(0, nTiles); - m_tiles.resize(nTiles); - - createPixmaps(rect().size()); - - m_active = true; -} - -void Waveform::reset() -{ - WAVEFORM_DEBUG << "Waveform::reset"; - - m_bufferPosition = 0; - m_buffer = QByteArray(); - m_audioPosition = 0; - m_format = QAudioFormat(); - m_active = false; - deletePixmaps(); - m_tiles.clear(); - m_tileLength = 0; - m_tileArrayStart = 0; - m_windowPosition = 0; - m_windowLength = 0; -} - -void Waveform::bufferChanged(qint64 position, qint64 length, const QByteArray &buffer) -{ - WAVEFORM_DEBUG << "Waveform::bufferChanged" - << "audioPosition" << m_audioPosition - << "bufferPosition" << position - << "bufferLength" << length; - m_bufferPosition = position; - m_bufferLength = length; - m_buffer = buffer; - paintTiles(); -} - -void Waveform::audioPositionChanged(qint64 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() -{ - QPixmap *pixmap; - foreach (pixmap, m_pixmaps) - delete pixmap; - m_pixmaps.clear(); -} - -void Waveform::createPixmaps(const QSize &widgetSize) -{ - m_pixmapSize = widgetSize; - m_pixmapSize.setWidth(qreal(widgetSize.width()) * m_tileLength / m_windowLength); - - WAVEFORM_DEBUG << "Waveform::createPixmaps" - << "widgetSize" << widgetSize - << "pixmapSize" << m_pixmapSize; - - Q_ASSERT(m_tiles.count() == m_pixmaps.count()); - - // (Re)create pixmaps - for (int i=0; i<m_pixmaps.size(); ++i) { - delete m_pixmaps[i]; - m_pixmaps[i] = 0; - m_pixmaps[i] = new QPixmap(m_pixmapSize); - } - - // Update tile pixmap pointers, and mark for repainting - for (int i=0; i<m_tiles.count(); ++i) { - m_tiles[i].pixmap = m_pixmaps[i]; - m_tiles[i].painted = false; - } -} - -void Waveform::setWindowPosition(qint64 position) -{ - WAVEFORM_DEBUG << "Waveform::setWindowPosition" - << "old" << m_windowPosition << "new" << position - << "tileArrayStart" << m_tileArrayStart; - - const qint64 oldPosition = m_windowPosition; - m_windowPosition = position; - - if ((m_windowPosition >= oldPosition) && - (m_windowPosition - m_tileArrayStart < (m_tiles.count() * m_tileLength))) { - // Work out how many tiles need to be shuffled - const qint64 offset = m_windowPosition - m_tileArrayStart; - const int nTiles = offset / m_tileLength; - shuffleTiles(nTiles); - } else { - resetTiles(m_windowPosition); - } - - if (!paintTiles() && m_windowPosition != oldPosition) - update(); -} - -qint64 Waveform::tilePosition(int index) const -{ - return m_tileArrayStart + index * m_tileLength; -} - -Waveform::TilePoint Waveform::tilePoint(qint64 position) const -{ - TilePoint result; - if (position >= m_tileArrayStart) { - const qint64 tileArrayEnd = m_tileArrayStart + m_tiles.count() * m_tileLength; - if (position < tileArrayEnd) { - const qint64 offsetIntoTileArray = position - m_tileArrayStart; - result.index = offsetIntoTileArray / m_tileLength; - Q_ASSERT(result.index >= 0 && result.index <= m_tiles.count()); - result.positionOffset = offsetIntoTileArray % m_tileLength; - result.pixelOffset = tilePixelOffset(result.positionOffset); - Q_ASSERT(result.pixelOffset >= 0 && result.pixelOffset <= m_pixmapSize.width()); - } - } - - return result; -} - -int Waveform::tilePixelOffset(qint64 positionOffset) const -{ - Q_ASSERT(positionOffset >= 0 && positionOffset <= m_tileLength); - const int result = (qreal(positionOffset) / m_tileLength) * m_pixmapSize.width(); - return result; -} - -int Waveform::windowPixelOffset(qint64 positionOffset) const -{ - Q_ASSERT(positionOffset >= 0 && positionOffset <= m_windowLength); - const int result = (qreal(positionOffset) / m_windowLength) * rect().width(); - return result; -} - -bool Waveform::paintTiles() -{ - WAVEFORM_DEBUG << "Waveform::paintTiles"; - bool updateRequired = false; - - for (int i=0; i<m_tiles.count(); ++i) { - const Tile &tile = m_tiles[i]; - if (!tile.painted) { - 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; - } - } - } - - if (updateRequired) - update(); - - return updateRequired; -} - -void Waveform::paintTile(int index) -{ - const qint64 tileStart = m_tileArrayStart + index * 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 - m_bufferPosition) / 2); - const int numSamples = m_tileLength / (2 * m_format.channels()); - - QPainter painter(tile.pixmap); - - painter.fillRect(tile.pixmap->rect(), Qt::black); - - QPen pen(Qt::white); - painter.setPen(pen); - - // Calculate initial PCM value - qint16 previousPcmValue = 0; - if (buffer > base) - previousPcmValue = *(buffer - m_format.channels()); - - // Calculate initial point - const qreal previousRealValue = pcmToReal(previousPcmValue); - const int originY = ((previousRealValue + 1.0) / 2) * m_pixmapSize.height(); - const QPoint origin(0, originY); - - QLine line(origin, origin); - - 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); - - const int x = tilePixelOffset(i * 2 * m_format.channels()); - const int y = ((realValue + 1.0) / 2) * m_pixmapSize.height(); - - line.setP2(QPoint(x, y)); - painter.drawLine(line); - line.setP1(line.p2()); - } - - tile.painted = true; -} - -void Waveform::shuffleTiles(int n) -{ - WAVEFORM_DEBUG << "Waveform::shuffleTiles" << "n" << n; - - while (n--) { - Tile tile = m_tiles.first(); - tile.painted = false; - m_tiles.erase(m_tiles.begin()); - m_tiles += tile; - m_tileArrayStart += m_tileLength; - } - - WAVEFORM_DEBUG << "Waveform::shuffleTiles" << "tileArrayStart" << m_tileArrayStart; -} - -void Waveform::resetTiles(qint64 newStartPos) -{ - WAVEFORM_DEBUG << "Waveform::resetTiles" << "newStartPos" << newStartPos; - - QVector<Tile>::iterator i = m_tiles.begin(); - for ( ; i != m_tiles.end(); ++i) - i->painted = false; - - m_tileArrayStart = newStartPos; -} - |