Add boom and rainbow analyzers

src/analyzer/rainbowanalyzer.cpp

@@ -0,0 +1,207 @@
+/*
+   Strawberry Music Player
+   This file was part of Clementine.
+   Copyright 2011, Tyler Rhodes <tyler.s.rhodes@gmail.com>
+   Copyright 2011-2012, 2014, David Sansome <me@davidsansome.com>
+   Copyright 2011, 2014, John Maguire <john.maguire@gmail.com>
+   Copyright 2014, Alibek Omarov <a1ba.omarov@gmail.com>
+   Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+   Copyright 2014-2015, Mark Furneaux <mark@furneaux.ca>
+   Copyright 2015, Arun Narayanankutty <n.arun.lifescience@gmail.com>
+
+   Strawberry is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Strawberry is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "rainbowanalyzer.h"
+
+#include <cmath>
+
+#include <QObject>
+#include <QWidget>
+#include <QPixmap>
+#include <QPainter>
+#include <QColor>
+#include <QBrush>
+#include <QPen>
+#include <QTimerEvent>
+
+#include "core/arraysize.h"
+#include "core/logging.h"
+
+using Analyzer::Scope;
+
+const int Rainbow::RainbowAnalyzer::kHeight[] = {21, 33};
+const int Rainbow::RainbowAnalyzer::kWidth[] = {34, 53};
+const int Rainbow::RainbowAnalyzer::kFrameCount[] = {6, 16};
+const int Rainbow::RainbowAnalyzer::kRainbowHeight[] = {21, 16};
+const int Rainbow::RainbowAnalyzer::kRainbowOverlap[] = {13, 15};
+const int Rainbow::RainbowAnalyzer::kSleepingHeight[] = {24, 33};
+
+const char* Rainbow::NyanCatAnalyzer::kName = "Nyanalyzer Cat";
+const char* Rainbow::RainbowDashAnalyzer::kName = "Rainbow Dash";
+const float Rainbow::RainbowAnalyzer::kPixelScale = 0.02f;
+
+Rainbow::RainbowAnalyzer::RainbowType Rainbow::RainbowAnalyzer::rainbowtype;
+
+Rainbow::RainbowAnalyzer::RainbowAnalyzer(const RainbowType& rbtype, QWidget* parent)
+    : Analyzer::Base(parent, 9),
+      timer_id_(startTimer(kFrameIntervalMs)),
+      frame_(0),
+      current_buffer_(0),
+      available_rainbow_width_(0),
+      px_per_frame_(0),
+      x_offset_(0),
+      background_brush_(QColor(0x0f, 0x43, 0x73))
+      {
+
+  rainbowtype = rbtype;
+  cat_dash_[0] = QPixmap(":/pictures/nyancat.png");
+  cat_dash_[1] = QPixmap(":/pictures/rainbowdash.png");
+  memset(history_, 0, sizeof(history_));
+
+  for (int i = 0; i < kRainbowBands; ++i) {
+    colors_[i] = QPen(QColor::fromHsv(i * 255 / kRainbowBands, 255, 255), kRainbowHeight[rainbowtype] / kRainbowBands, Qt::SolidLine, Qt::FlatCap, Qt::RoundJoin);
+
+    // pow constants computed so that
+    // | band_scale(0) | ~= .5 and | band_scale(5) | ~= 32
+    band_scale_[i] = -std::cos(M_PI * i / (kRainbowBands - 1)) * 0.5 * std::pow(2.3, i);
+  }
+
+}
+
+void Rainbow::RainbowAnalyzer::transform(Scope& s) { fht_->spectrum(s.data()); }
+
+void Rainbow::RainbowAnalyzer::timerEvent(QTimerEvent* e) {
+
+  if (e->timerId() == timer_id_) {
+    frame_ = (frame_ + 1) % kFrameCount[rainbowtype];
+  }
+  else {
+    Analyzer::Base::timerEvent(e);
+  }
+
+}
+
+void Rainbow::RainbowAnalyzer::resizeEvent(QResizeEvent* e) {
+
+  // Invalidate the buffer so it's recreated from scratch in the next paint event.
+  buffer_[0] = QPixmap();
+  buffer_[1] = QPixmap();
+
+  available_rainbow_width_ = width() - kWidth[rainbowtype] + kRainbowOverlap[rainbowtype];
+  px_per_frame_ = static_cast<float>(available_rainbow_width_) / (kHistorySize - 1) + 1;
+  x_offset_ = px_per_frame_ * (kHistorySize - 1) - available_rainbow_width_;
+
+}
+
+void Rainbow::RainbowAnalyzer::analyze(QPainter& p, const Analyzer::Scope& s, bool new_frame) {
+
+  // Discard the second half of the transform
+  const int scope_size = s.size() / 2;
+
+  if ((new_frame && is_playing_) || (buffer_[0].isNull() && buffer_[1].isNull())) {
+    // Transform the music into rainbows!
+    for (int band = 0; band < kRainbowBands; ++band) {
+      float* band_start = history_ + band * kHistorySize;
+
+      // Move the history of each band across by 1 frame.
+      memmove(band_start, band_start + 1, (kHistorySize - 1) * sizeof(float));
+    }
+
+    // Now accumulate the scope data into each band.  Should maybe use a series
+    // of band pass filters for this, so bands can leak into neighbouring bands,
+    // but for now it's a series of separate square filters.
+    const int samples_per_band = scope_size / kRainbowBands;
+    int sample = 0;
+    for (int band = 0; band < kRainbowBands; ++band) {
+      float accumulator = 0.0;
+      for (int i = 0; i < samples_per_band; ++i) {
+        accumulator += s[sample++];
+      }
+
+      history_[(band + 1) * kHistorySize - 1] = accumulator * band_scale_[band];
+    }
+
+    // Create polylines for the rainbows.
+    QPointF polyline[kRainbowBands * kHistorySize];
+    QPointF* dest = polyline;
+    float* source = history_;
+
+    const float top_of = static_cast<float>(height()) / 2 - static_cast<float>(kRainbowHeight[rainbowtype]) / 2;
+    for (int band = 0; band < kRainbowBands; ++band) {
+      // Calculate the Y position of this band.
+      const float y = static_cast<float>(kRainbowHeight[rainbowtype]) / (kRainbowBands + 1) * (band + 0.5) + top_of;
+
+      // Add each point in the line.
+      for (int x = 0; x < kHistorySize; ++x) {
+        *dest = QPointF(px_per_frame_ * x, y + *source * kPixelScale);
+        ++dest;
+        ++source;
+      }
+    }
+
+    // Do we have to draw the whole rainbow into the buffer?
+    if (buffer_[0].isNull()) {
+      for (int i = 0; i < 2; ++i) {
+        buffer_[i] = QPixmap(QSize(width() + x_offset_, height()));
+        buffer_[i].fill(background_brush_.color());
+      }
+      current_buffer_ = 0;
+
+      QPainter buffer_painter(&buffer_[0]);
+      buffer_painter.setRenderHint(QPainter::Antialiasing);
+      for (int band = kRainbowBands - 1; band >= 0; --band) {
+        buffer_painter.setPen(colors_[band]);
+        buffer_painter.drawPolyline(&polyline[band * kHistorySize], kHistorySize);
+        buffer_painter.drawPolyline(&polyline[band * kHistorySize], kHistorySize);
+      }
+    }
+    else {
+      const int last_buffer = current_buffer_;
+      current_buffer_ = (current_buffer_ + 1) % 2;
+
+      // We can just shuffle the buffer along a bit and draw the new frame's data.
+      QPainter buffer_painter(&buffer_[current_buffer_]);
+      buffer_painter.setRenderHint(QPainter::Antialiasing);
+
+      buffer_painter.drawPixmap(0, 0, buffer_[last_buffer], px_per_frame_, 0, x_offset_ + available_rainbow_width_ - px_per_frame_, 0);
+      buffer_painter.fillRect(x_offset_ + available_rainbow_width_ - px_per_frame_, 0, kWidth[rainbowtype] - kRainbowOverlap[rainbowtype] + px_per_frame_, height(), background_brush_);
+
+      for (int band = kRainbowBands - 1; band >= 0; --band) {
+        buffer_painter.setPen(colors_[band]);
+        buffer_painter.drawPolyline(&polyline[(band + 1) * kHistorySize - 3], 3);
+      }
+    }
+  }
+
+  // Draw the buffer on to the widget
+  p.drawPixmap(0, 0, buffer_[current_buffer_], x_offset_, 0, 0, 0);
+
+  // Draw rainbow analyzer (nyan cat or rainbowdash)
+  // Nyan nyan nyan nyan dash dash dash dash.
+  if (!is_playing_) {
+    // Ssshhh!
+    p.drawPixmap(SleepingDestRect(rainbowtype), cat_dash_[rainbowtype], SleepingSourceRect(rainbowtype));
+  }
+  else {
+    p.drawPixmap(DestRect(rainbowtype), cat_dash_[rainbowtype], SourceRect(rainbowtype));
+  }
+
+}
+
+Rainbow::NyanCatAnalyzer::NyanCatAnalyzer(QWidget* parent)
+    : RainbowAnalyzer(Rainbow::RainbowAnalyzer::Nyancat, parent) {}
+
+Rainbow::RainbowDashAnalyzer::RainbowDashAnalyzer(QWidget* parent)
+    : RainbowAnalyzer(Rainbow::RainbowAnalyzer::Dash, parent) {}