Merge branch 'master' into rational_slider

CMakeLists.txt

@@ -18,7 +18,6 @@ cmake_minimum_required(VERSION 3.13 FATAL_ERROR)
 
 project(olive-editor VERSION 0.2.0 LANGUAGES CXX)
 
-option(UPDATE_TS "Update translations" OFF)
 option(BUILD_DOXYGEN "Build Doxygen documentation" OFF)
 
 set(CMAKE_CXX_STANDARD 11)

app/audio/audiomanager.h

@@ -27,6 +27,7 @@
 #include <QtConcurrent/QtConcurrent>
 #include <QThread>
 
+#include "audiovisualwaveform.h"
 #include "common/define.h"
 #include "outputmanager.h"
 #include "render/audioparams.h"
@@ -94,6 +95,8 @@ signals:
 
   void OutputDeviceStarted(AudioPlaybackCache* cache, qint64 offset, int playback_speed);
 
+  void OutputWaveformStarted(const AudioVisualWaveform* waveform, const rational &start, int playback_speed);
+
   void AudioParamsChanged(const AudioParams& params);
 
   void OutputPushed(const QByteArray& data);

app/audio/audiovisualwaveform.cpp

@@ -23,14 +23,69 @@
 #include <QDebug>
 
 #include "config/config.h"
+#include "common/functiontimer.h"
 
 namespace olive {
 
-const int AudioVisualWaveform::kSumSampleRate = 200;
-
-void AudioVisualWaveform::AddSum(const float *samples, int nb_samples, int nb_channels)
+AudioVisualWaveform::AudioVisualWaveform() :
+  channels_(0)
 {
-  data_.append(SumSamples(samples, nb_samples, nb_channels));
+  // Must be a power of 2
+  static const rational kMinimumSampleRate = rational(1, 8);
+  static const rational kMaximumSampleRate = 8192;
+
+  for (rational i=kMinimumSampleRate; i<=kMaximumSampleRate; i*=2) {
+    mipmapped_data_.insert({i, Sample()});
+  }
+}
+
+void AudioVisualWaveform::OverwriteSamplesFromBuffer(SampleBufferPtr samples, int sample_rate, const rational &start, double target_rate, Sample& data, int &start_index, int &samples_length)
+{
+  start_index = time_to_samples(start, target_rate);
+  samples_length = time_to_samples(static_cast<double>(samples->sample_count()) / static_cast<double>(sample_rate), target_rate);
+
+  int end_index = start_index + samples_length;
+  if (data.size() < end_index) {
+    data.resize(end_index);
+  }
+
+  int chunk_size = sample_rate / target_rate;
+
+  for (int i=0; i<samples_length; i+=channels_) {
+    int src_index = (i * chunk_size) / channels_;
+
+    Sample summary = SumSamples(samples,
+                                src_index,
+                                qMin(chunk_size, samples->sample_count() - src_index));
+
+    memcpy(&data.data()[i + start_index],
+        summary.constData(),
+        summary.size() * sizeof(SamplePerChannel));
+  }
+}
+
+void AudioVisualWaveform::OverwriteSamplesFromMipmap(const AudioVisualWaveform::Sample &input, double input_sample_rate, int &input_start, int &input_length, const rational &start, double output_rate, AudioVisualWaveform::Sample &output_data)
+{
+  int start_index = time_to_samples(start, output_rate);
+  int samples_length = time_to_samples(static_cast<double>(input_length / channels_) / input_sample_rate, output_rate);
+
+  int end_index = start_index + samples_length;
+  if (output_data.size() < end_index) {
+    output_data.resize(end_index);
+  }
+
+  int chunk_size = input_sample_rate / output_rate;
+
+  for (int i=0; i<samples_length; i+=channels_) {
+    Sample summary = ReSumSamples(&input.constData()[input_start + (i*chunk_size)], chunk_size * channels_, channels_);
+
+    memcpy(&output_data.data()[i + start_index],
+        summary.constData(),
+        summary.size() * sizeof(SamplePerChannel));
+  }
+
+  input_start = start_index;
+  input_length = samples_length;
 }
 
 void AudioVisualWaveform::OverwriteSamples(SampleBufferPtr samples, int sample_rate, const rational &start)
@@ -40,178 +95,158 @@ void AudioVisualWaveform::OverwriteSamples(SampleBufferPtr samples, int sample_r
     return;
   }
 
-  int start_index = time_to_samples(start);
-  int samples_length = time_to_samples(static_cast<double>(samples->sample_count()) / static_cast<double>(sample_rate));
+  // Old less optimized code. Keeping this around as a reference, but the below code is at least
+  // 10x faster so this shouldn't be used in production.
+  //
+  // int input_start, input_length;
+  // for (auto it=mipmapped_data_.begin(); it!=mipmapped_data_.end(); it++) {
+  //   OverwriteSamplesFromBuffer(samples, sample_rate, start, it->first.toDouble(), it->second, input_start, input_length);
+  // }
 
-  int end_index = start_index + samples_length;
-  if (data_.size() < end_index) {
-    data_.resize(end_index);
-  }
+  // Process the largest mipmap directly for the samples
+  auto current_mipmap = mipmapped_data_.rbegin();
+  int input_start, input_length;
+  OverwriteSamplesFromBuffer(samples, sample_rate, start, current_mipmap->first.toDouble(), current_mipmap->second, input_start, input_length);
 
-  int chunk_size = sample_rate / kSumSampleRate;
+  while (true) {
+    // For each smaller mipmap, we just process from the mipmap before it, making each one
+    // exponentially faster to create
+    auto previous_mipmap = current_mipmap;
+    current_mipmap++;
+    if (current_mipmap == mipmapped_data_.rend()) {
+      break;
+    }
 
-  for (int i=0; i<samples_length; i+=channels_) {
-    int src_index = (i * chunk_size) / channels_;
-
-    QVector<SamplePerChannel> summary = SumSamples(samples,
-                                                   src_index,
-                                                   qMin(chunk_size, samples->sample_count() - src_index));
-
-    memcpy(&data_.data()[i + start_index],
-        summary.constData(),
-        summary.size() * sizeof(SamplePerChannel));
+    OverwriteSamplesFromMipmap(previous_mipmap->second, previous_mipmap->first.toDouble(),
+                               input_start, input_length, start, current_mipmap->first.toDouble(),
+                               current_mipmap->second);
   }
 }
 
 void AudioVisualWaveform::OverwriteSums(const AudioVisualWaveform &sums, const rational &dest, const rational& offset, const rational& length)
 {
-  if (sums.data_.isEmpty()) {
-    return;
+  for (auto it=mipmapped_data_.begin(); it!=mipmapped_data_.end(); it++) {
+    rational rate = it->first;
+
+    Sample& our_arr = it->second;
+    const Sample& their_arr = sums.mipmapped_data_.at(rate);
+
+    double rate_dbl = rate.toDouble();
+
+    // Get our destination sample
+    int our_start_index = time_to_samples(dest, rate_dbl);
+
+    // Get our source sample
+    int their_start_index = time_to_samples(offset, rate_dbl);
+
+    // Determine how much we're copying
+    int copy_len = their_arr.size() - their_start_index;
+    if (!length.isNull()) {
+      copy_len = qMin(copy_len, time_to_samples(length, rate_dbl));
+    }
+
+    // Determine end index of our array
+    int end_index = our_start_index + copy_len;
+    if (our_arr.size() < end_index) {
+      our_arr.resize(end_index);
+    }
+
+    memcpy(reinterpret_cast<char*>(our_arr.data()) + our_start_index * sizeof(SamplePerChannel),
+           reinterpret_cast<const char*>(their_arr.constData()) + their_start_index * sizeof(SamplePerChannel),
+           copy_len * sizeof(SamplePerChannel));
   }
-
-  int start_index = time_to_samples(dest);
-  int sample_start = time_to_samples(offset);
-
-  int copy_len = sums.data_.size() - sample_start;
-  if (!length.isNull()) {
-    copy_len = qMin(copy_len, time_to_samples(length));
-  }
-
-  int end_index = start_index + copy_len;
-
-  if (data_.size() < end_index) {
-    data_.resize(end_index);
-  }
-
-  memcpy(reinterpret_cast<char*>(data_.data()) + start_index * sizeof(SamplePerChannel),
-         reinterpret_cast<const char*>(sums.data_.constData()) + time_to_samples(offset) * sizeof(SamplePerChannel),
-         copy_len * sizeof(SamplePerChannel));
-}
-
-AudioVisualWaveform AudioVisualWaveform::Mid(const rational &time) const
-{
-  int sample_index = time_to_samples(time);
-
-  // Create a copy of this waveform chop the early section off
-  AudioVisualWaveform copy = *this;
-  copy.data_ = data_.mid(sample_index);
-
-  return copy;
-}
-
-void AudioVisualWaveform::Append(const AudioVisualWaveform &waveform)
-{
-  data_.append(waveform.data_);
-}
-
-void AudioVisualWaveform::TrimIn(const rational &time)
-{
-  data_ = data_.mid(time_to_samples(time));
-}
-
-void AudioVisualWaveform::TrimOut(const rational &time)
-{
-  data_.resize(data_.size() - time_to_samples(time));
-}
-
-void AudioVisualWaveform::PrependSilence(const rational &time)
-{
-  int added_samples = time_to_samples(time);
-
-  // Resize buffer for extra space
-  data_.resize(data_.size() + added_samples);
-
-  // Shift all data forward
-  for (int i=data_.size()-1; i>=added_samples; i--) {
-    data_[i] = data_[i - added_samples];
-  }
-
-  // Fill remainder with silence
-  memset(reinterpret_cast<char*>(data_.data()), 0, added_samples * sizeof(SamplePerChannel));
-}
-
-void AudioVisualWaveform::AppendSilence(const rational &time)
-{
-  int added_samples = time_to_samples(time);
-
-  // Resize buffer for extra space
-  int old_size = data_.size();
-  data_.resize(old_size + added_samples);
-
-  // Fill remainder with silence
-  memset(reinterpret_cast<char*>(&data_[old_size]), 0, (data_.size() - old_size) * sizeof(SamplePerChannel));
 }
 
 void AudioVisualWaveform::Shift(const rational &from, const rational &to)
 {
-  int from_index = time_to_samples(from);
-  int to_index = time_to_samples(to);
+  for (auto it=mipmapped_data_.begin(); it!=mipmapped_data_.end(); it++) {
+    rational rate = it->first;
+    double rate_dbl = rate.toDouble();
+    Sample& data = it->second;
 
-  if (from_index == to_index) {
-    return;
-  }
+    int from_index = time_to_samples(from, rate_dbl);
+    int to_index = time_to_samples(to, rate_dbl);
 
-  if (from_index > data_.size()) {
-    return;
-  }
-
-  if (from_index > to_index) {
-    // Shifting backwards <-
-    int copy_sz = data_.size() - from_index;
-
-    for (int i=0; i<copy_sz; i++) {
-      data_.replace(to_index + i, data_.at(from_index + i));
+    if (from_index == to_index) {
+      return;
     }
 
-    data_.resize(data_.size() - (from_index - to_index));
-  } else {
-    // Shifting forwards ->
-    int old_sz = data_.size();
-
-    int distance = (to_index - from_index);
-
-    data_.resize(data_.size() + distance);
-
-    int copy_sz = old_sz - from_index;
-
-    for (int i=0; i<copy_sz; i++) {
-      data_.replace(data_.size() - i - 1, data_.at(old_sz - i - 1));
+    if (from_index > data.size()) {
+      return;
     }
 
-    memset(reinterpret_cast<char*>(&data_[from_index]), 0, distance * sizeof(SamplePerChannel));
+    if (from_index > to_index) {
+      // Shifting backwards <-
+      int copy_sz = data.size() - from_index;
+
+      for (int i=0; i<copy_sz; i++) {
+        data.replace(to_index + i, data.at(from_index + i));
+      }
+
+      data.resize(data.size() - (from_index - to_index));
+    } else {
+      // Shifting forwards ->
+      int old_sz = data.size();
+
+      int distance = (to_index - from_index);
+
+      data.resize(data.size() + distance);
+
+      int copy_sz = old_sz - from_index;
+
+      for (int i=0; i<copy_sz; i++) {
+        data.replace(data.size() - i - 1, data.at(old_sz - i - 1));
+      }
+
+      memset(reinterpret_cast<char*>(&data[from_index]), 0, distance * sizeof(SamplePerChannel));
+    }
   }
 }
 
-QVector<AudioVisualWaveform::SamplePerChannel> AudioVisualWaveform::SumSamples(const float *samples, int nb_samples, int nb_channels)
+AudioVisualWaveform::Sample AudioVisualWaveform::GetSummaryFromTime(const rational &start, const rational &length) const
 {
-  return SumSamplesInternal<float>(samples, nb_samples, nb_channels);
+  // Find mipmap that requries
+  auto using_mipmap = GetMipmapForScale(length.flipped().toDouble());
+
+  double rate_dbl = using_mipmap->first.toDouble();
+
+  int start_sample = time_to_samples(start, rate_dbl);
+  int sample_length = time_to_samples(length, rate_dbl);
+
+  return ReSumSamples(&using_mipmap->second.constData()[start_sample], sample_length, channels_);
 }
 
-QVector<AudioVisualWaveform::SamplePerChannel> AudioVisualWaveform::SumSamples(const qfloat16 *samples, int nb_samples, int nb_channels)
+AudioVisualWaveform::Sample AudioVisualWaveform::SumSamples(const float *samples, int nb_samples, int nb_channels)
 {
-  return SumSamplesInternal<qfloat16>(samples, nb_samples, nb_channels);
+  AudioVisualWaveform::Sample summed_samples(nb_channels);
+
+  for (int i=0;i<nb_samples;i++) {
+    ExpandMinMax(summed_samples[i%nb_channels], samples[i]);
+  }
+
+  return summed_samples;
 }
 
-QVector<AudioVisualWaveform::SamplePerChannel> AudioVisualWaveform::SumSamples(SampleBufferPtr samples, int start_index, int length)
+AudioVisualWaveform::Sample AudioVisualWaveform::SumSamples(SampleBufferPtr samples, int start_index, int length)
 {
-  QVector<AudioVisualWaveform::SamplePerChannel> summed_samples(samples->audio_params().channel_count());
+  AudioVisualWaveform::Sample summed_samples(samples->audio_params().channel_count());
 
   int end_index = start_index + length;
 
   for (int i=start_index; i<end_index; i++) {
     for (int channel=0; channel<samples->audio_params().channel_count(); channel++) {
-      ExpandMinMax<float>(summed_samples[channel], samples->data(channel)[i]);
+      ExpandMinMax(summed_samples[channel], samples->data(channel)[i]);
     }
   }
 
   return summed_samples;
 }
 
-QVector<AudioVisualWaveform::SamplePerChannel> AudioVisualWaveform::ReSumSamples(const SamplePerChannel* samples,
+AudioVisualWaveform::Sample AudioVisualWaveform::ReSumSamples(const SamplePerChannel* samples,
                                                                                  int nb_samples,
                                                                                  int nb_channels)
 {
-  QVector<AudioVisualWaveform::SamplePerChannel> summed_samples(nb_channels);
+  AudioVisualWaveform::Sample summed_samples(nb_channels);
 
   for (int i=0;i<nb_samples;i+=nb_channels) {
     for (int j=0;j<nb_channels;j++) {
@@ -230,16 +265,20 @@ QVector<AudioVisualWaveform::SamplePerChannel> AudioVisualWaveform::ReSumSamples
   return summed_samples;
 }
 
-void AudioVisualWaveform::DrawSample(QPainter *painter, const QVector<SamplePerChannel>& sample, int x, int y, int height)
+void AudioVisualWaveform::DrawSample(QPainter *painter, const Sample& sample, int x, int y, int height, bool rectified)
 {
+  if (sample.isEmpty()) {
+    return;
+  }
+
   int channel_height = height / sample.size();
   int channel_half_height = channel_height / 2;
 
   for (int i=0;i<sample.size();i++) {
-    qfloat16 max = qMin(sample.at(i).max, static_cast<qfloat16>(1.0f));
-    qfloat16 min = qMax(sample.at(i).min, static_cast<qfloat16>(-1.0));
+    float max = qMin(sample.at(i).max, 1.0f);
+    float min = qMax(sample.at(i).min, -1.0f);
 
-    if (Config::Current()[QStringLiteral("RectifiedWaveforms")].toBool()) {
+    if (rectified) {
       int channel_bottom = y + channel_height * (i + 1);
 
       int diff = qRound((max - min) * channel_half_height);
@@ -261,16 +300,26 @@ void AudioVisualWaveform::DrawSample(QPainter *painter, const QVector<SamplePerC
 
 void AudioVisualWaveform::DrawWaveform(QPainter *painter, const QRect& rect, const double& scale, const AudioVisualWaveform &samples, const rational& start_time)
 {
-  int start_sample_index = samples.time_to_samples(start_time);
+  if (samples.mipmapped_data_.empty()) {
+    return;
+  }
 
-  if (start_sample_index >= samples.nb_samples()) {
+  auto using_mipmap = samples.GetMipmapForScale(scale);
+
+  rational rate = using_mipmap->first;
+  double rate_dbl = rate.toDouble();
+  const Sample& arr = using_mipmap->second;
+
+  int start_sample_index = samples.time_to_samples(start_time, rate_dbl);
+
+  if (start_sample_index >= arr.size()) {
     return;
   }
 
   int next_sample_index = start_sample_index;
   int sample_index;
 
-  QVector<SamplePerChannel> summary;
+  Sample summary;
   int summary_index = -1;
 
   const QRect& viewport = painter->viewport();
@@ -279,51 +328,54 @@ void AudioVisualWaveform::DrawWaveform(QPainter *painter, const QRect& rect, con
   int start = qMax(rect.x(), -top_left.x());
   int end = qMin(rect.right(), -top_left.x() + viewport.width());
 
+  bool rectified = Config::Current()[QStringLiteral("RectifiedWaveforms")].toBool();
+
   for (int i=start;i<end;i++) {
     sample_index = next_sample_index;
 
-    if (sample_index == samples.nb_samples()) {
+    if (sample_index == arr.size()) {
       break;
     }
 
-    next_sample_index = qMin(samples.nb_samples(),
-                             start_sample_index + qFloor(static_cast<double>(kSumSampleRate) * static_cast<double>(i - rect.x() + 1) / scale) * samples.channel_count());
+    next_sample_index = qMin(arr.size(),
+                             start_sample_index + qFloor(rate_dbl * static_cast<double>(i - rect.x() + 1) / scale) * samples.channel_count());
 
     if (summary_index != sample_index) {
-      summary = AudioVisualWaveform::ReSumSamples(&samples.data_.at(sample_index),
+      summary = AudioVisualWaveform::ReSumSamples(&arr.at(sample_index),
                                                   qMax(samples.channel_count(), next_sample_index - sample_index),
                                                   samples.channel_count());
       summary_index = sample_index;
     }
 
-    DrawSample(painter, summary, i, rect.y(), rect.height());
+    DrawSample(painter, summary, i, rect.y(), rect.height(), rectified);
   }
 }
 
-int AudioVisualWaveform::time_to_samples(const rational &time) const
+int AudioVisualWaveform::time_to_samples(const rational &time, double sample_rate) const
 {
-  return time_to_samples(time.toDouble());
+  return time_to_samples(time.toDouble(), sample_rate);
 }
 
-int AudioVisualWaveform::time_to_samples(const double &time) const
+int AudioVisualWaveform::time_to_samples(const double &time, double sample_rate) const
 {
-  return qFloor(time * kSumSampleRate) * channels_;
+  return qFloor(time * sample_rate) * channels_;
 }
 
-template<typename T>
-QVector<AudioVisualWaveform::SamplePerChannel> AudioVisualWaveform::SumSamplesInternal(const T *samples, int nb_samples, int nb_channels)
+std::map<rational, AudioVisualWaveform::Sample>::const_iterator AudioVisualWaveform::GetMipmapForScale(double scale) const
 {
-  QVector<AudioVisualWaveform::SamplePerChannel> summed_samples(nb_channels);
-
-  for (int i=0;i<nb_samples;i++) {
-    ExpandMinMax<T>(summed_samples[i%nb_channels], samples[i]);
+  // Find largest mipmap for this scale (or the largest if we don't find one sufficient)
+  auto using_mipmap = mipmapped_data_.cend();
+  using_mipmap--;
+  for (auto it=mipmapped_data_.cbegin(); it!=mipmapped_data_.cend(); it++) {
+    if (it->first.toDouble() >= scale) {
+      using_mipmap = it;
+      break;
+    }
   }
-
-  return summed_samples;
+  return using_mipmap;
 }
 
-template<typename T>
-void AudioVisualWaveform::ExpandMinMax(AudioVisualWaveform::SamplePerChannel &sum, T value)
+void AudioVisualWaveform::ExpandMinMax(AudioVisualWaveform::SamplePerChannel &sum, float value)
 {
   if (value < sum.min) {
     sum.min = value;

app/audio/audiovisualwaveform.h

@@ -21,7 +21,6 @@
 #ifndef SUMSAMPLES_H
 #define SUMSAMPLES_H
 
-#include <QFloat16>
 #include <QPainter>
 #include <QVector>
 
@@ -37,11 +36,11 @@ namespace olive {
  */
 class AudioVisualWaveform {
 public:
-  AudioVisualWaveform() = default;
+  AudioVisualWaveform();
 
   struct SamplePerChannel {
-    qfloat16 min;
-    qfloat16 max;
+    float min;
+    float max;
   };
 
   using Sample = QVector<SamplePerChannel>;
@@ -56,18 +55,11 @@ public:
     channels_ = channels;
   }
 
-  int nb_samples() const
-  {
-    return data_.size();
-  }
-
-  const SamplePerChannel* const_data() const
-  {
-    return data_.constData();
-  }
-
-  void AddSum(const float* samples, int nb_samples, int nb_channels);
-
+  /**
+   * @brief Writes samples into the visual waveform buffer
+   *
+   * Starting at `start`, writes samples over anything in the buffer, expanding it if necessary.
+   */
   void OverwriteSamples(SampleBufferPtr samples, int sample_rate, const rational& start = rational());
 
   /**
@@ -91,40 +83,34 @@ public:
    */
   void OverwriteSums(const AudioVisualWaveform& sums, const rational& dest, const rational& offset = rational(), const rational &length = rational());
 
-  AudioVisualWaveform Mid(const rational& time) const;
-  void Append(const AudioVisualWaveform& waveform);
-  void TrimIn(const rational& time);
-  void TrimOut(const rational& time);
-  void PrependSilence(const rational& time);
-  void AppendSilence(const rational& time);
   void Shift(const rational& from, const rational& to);
 
-  // FIXME: Move to dynamic
-  static const int kSumSampleRate;
+  Sample GetSummaryFromTime(const rational& start, const rational& length) const;
 
-  static QVector<SamplePerChannel> SumSamples(const float* samples, int nb_samples, int nb_channels);
-  static QVector<SamplePerChannel> SumSamples(const qfloat16* samples, int nb_samples, int nb_channels);
-  static QVector<SamplePerChannel> SumSamples(SampleBufferPtr samples, int start_index, int length);
+  static Sample SumSamples(const float* samples, int nb_samples, int nb_channels);
+  static Sample SumSamples(SampleBufferPtr samples, int start_index, int length);
 
-  static QVector<SamplePerChannel> ReSumSamples(const SamplePerChannel *samples, int nb_samples, int nb_channels);
+  static Sample ReSumSamples(const SamplePerChannel *samples, int nb_samples, int nb_channels);
 
-  static void DrawSample(QPainter* painter, const QVector<SamplePerChannel> &sample, int x, int y, int height);
+  static void DrawSample(QPainter* painter, const Sample &sample, int x, int y, int height, bool rectified);
 
   static void DrawWaveform(QPainter* painter, const QRect &rect, const double &scale, const AudioVisualWaveform& samples, const rational &start_time);
 
 private:
-  template <typename T>
-  static QVector<SamplePerChannel> SumSamplesInternal(const T* samples, int nb_samples, int nb_channels);
+  static void ExpandMinMax(SamplePerChannel &sum, float value);
 
-  template <typename T>
-  static void ExpandMinMax(SamplePerChannel &sum, T value);
+  void OverwriteSamplesFromBuffer(SampleBufferPtr samples, int sample_rate, const rational& start, double target_rate, Sample &data, int &start_index, int &samples_length);
 
-  int time_to_samples(const rational& time) const;
-  int time_to_samples(const double& time) const;
+  void OverwriteSamplesFromMipmap(const Sample& input, double input_sample_rate, int &input_start, int &input_length, const rational& start, double output_rate, Sample &output_data);
 
-  int channels_ = 0;
+  int time_to_samples(const rational& time, double sample_rate) const;
+  int time_to_samples(const double& time, double sample_rate) const;
 
-  QVector<SamplePerChannel> data_;
+  std::map<rational, Sample>::const_iterator GetMipmapForScale(double scale) const;
+
+  int channels_;
+
+  std::map<rational, Sample> mipmapped_data_;
 
 };
 

app/core.cpp

@@ -396,9 +396,6 @@ void Core::CreateNewSequence()
   // Create new sequence
   Sequence* new_sequence = CreateNewSequenceForProject(active_project);
 
-  // Set all defaults for the sequence
-  new_sequence->set_default_parameters();
-
   SequenceDialog sd(new_sequence, SequenceDialog::kNew, main_window_);
 
   // Make sure SequenceDialog doesn't make an undo command for editing the sequence, since we make an undo command for
@@ -1091,6 +1088,11 @@ void Core::OpenRecoveryProject(const QString &filename)
   OpenProjectInternal(filename, true);
 }
 
+void Core::OpenNodeInViewer(ViewerOutput *viewer)
+{
+  main_window_->OpenNodeInViewer(viewer);
+}
+
 void Core::CheckForAutoRecoveries()
 {
   QFile autorecovery_index(GetAutoRecoveryIndexFilename());

app/core.h

@@ -300,6 +300,8 @@ public:
 
   void OpenRecoveryProject(const QString& filename);
 
+  void OpenNodeInViewer(ViewerOutput* viewer);
+
   static const uint kProjectVersion;
 
 public slots:

app/dialog/preferences/tabs/preferencesdisktab.cpp

@@ -69,7 +69,7 @@ PreferencesDiskTab::PreferencesDiskTab()
   cache_behavior_layout->addWidget(new QLabel(tr("Cache Ahead:")), row, 0);
 
   cache_ahead_slider_ = new FloatSlider();
-  cache_ahead_slider_->SetFormat(tr("%1 second(s)"));
+  cache_ahead_slider_->SetFormat(tr("%1 seconds"));
   cache_ahead_slider_->SetMinimum(0);
   cache_ahead_slider_->SetValue(Config::Current()["DiskCacheAhead"].value<rational>().toDouble());
   cache_behavior_layout->addWidget(cache_ahead_slider_, row, 1);
@@ -78,7 +78,7 @@ PreferencesDiskTab::PreferencesDiskTab()
 
   cache_behind_slider_ = new FloatSlider();
   cache_behind_slider_->SetMinimum(0);
-  cache_behind_slider_->SetFormat(tr("%1 second(s)"));
+  cache_behind_slider_->SetFormat(tr("%1 seconds"));
   cache_behind_slider_->SetValue(Config::Current()["DiskCacheBehind"].value<rational>().toDouble());
   cache_behavior_layout->addWidget(cache_behind_slider_, row, 3);
 

app/dialog/preferences/tabs/preferencesgeneraltab.cpp

@@ -77,7 +77,9 @@ PreferencesGeneralTab::PreferencesGeneralTab()
 
     int row = 0;
 
-    timeline_layout->addWidget(new QLabel(tr("Auto-Scroll Method:")), row, 0);
+    QLabel* autoscroll_lbl = new QLabel(tr("Auto-Scroll Method:"));
+    autoscroll_lbl->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+    timeline_layout->addWidget(autoscroll_lbl, row, 0);
 
     // ComboBox indices match enum indices
     autoscroll_method_ = new QComboBox();
@@ -101,9 +103,17 @@ PreferencesGeneralTab::PreferencesGeneralTab()
 
     default_still_length_ = new FloatSlider();
     default_still_length_->SetMinimum(0.1);
-    default_still_length_->SetFormat(tr("%1 second(s)"));
+    default_still_length_->SetFormat(tr("%1 seconds"));
     default_still_length_->SetValue(Config::Current()["DefaultStillLength"].value<rational>().toDouble());
     timeline_layout->addWidget(default_still_length_);
+
+    row++;
+
+    timeline_layout->addWidget(new QLabel(tr("Default Sequence Parameters:")), row, 0);
+
+    QPushButton* default_sequence_params_btn = new QPushButton(tr("Edit"));
+    connect(default_sequence_params_btn, &QPushButton::clicked, this, &PreferencesGeneralTab::EditDefaultSequenceSettings);
+    timeline_layout->addWidget(default_sequence_params_btn, row, 1);
   }
 
   {
@@ -126,7 +136,7 @@ PreferencesGeneralTab::PreferencesGeneralTab()
     autorecovery_interval_ = new IntegerSlider();
     autorecovery_interval_->SetMinimum(1);
     autorecovery_interval_->SetMaximum(60);
-    autorecovery_interval_->SetFormat(tr("%1 minute(s)"));
+    autorecovery_interval_->SetFormat(QT_TRANSLATE_N_NOOP("olive::SliderBase", "%n minute(s)"), true);
     autorecovery_interval_->SetValue(Config::Current()[QStringLiteral("AutorecoveryInterval")].toLongLong());
     autorecovery_layout->addWidget(autorecovery_interval_, row, 1);
 
@@ -176,6 +186,17 @@ void PreferencesGeneralTab::Accept(MultiUndoCommand *command)
   Config::Current()[QStringLiteral("AutorecoveryInterval")] = QVariant::fromValue(autorecovery_interval_->GetValue());
   Config::Current()[QStringLiteral("AutorecoveryMaximum")] = QVariant::fromValue(autorecovery_maximum_->GetValue());
   Core::instance()->SetAutorecoveryInterval(autorecovery_interval_->GetValue());
+
+  // Default sequence parameters
+  VideoParams dsvp = default_sequence_.GetVideoParams();
+  AudioParams dsap = default_sequence_.GetAudioParams();
+  Config::Current()[QStringLiteral("DefaultSequenceWidth")] = dsvp.width();
+  Config::Current()[QStringLiteral("DefaultSequenceHeight")] = dsvp.height();
+  Config::Current()[QStringLiteral("DefaultSequencePixelAspect")] = QVariant::fromValue(dsvp.pixel_aspect_ratio());
+  Config::Current()[QStringLiteral("DefaultSequenceFrameRate")] = QVariant::fromValue(dsvp.frame_rate().flipped());
+  Config::Current()[QStringLiteral("DefaultSequenceInterlacing")] = dsvp.interlacing();
+  Config::Current()[QStringLiteral("DefaultSequenceAudioFrequency")] = dsap.sample_rate();
+  Config::Current()[QStringLiteral("DefaultSequenceAudioLayout")] = QVariant::fromValue(dsap.channel_layout());
 }
 
 void PreferencesGeneralTab::AddLanguage(const QString &locale_name)
@@ -185,4 +206,11 @@ void PreferencesGeneralTab::AddLanguage(const QString &locale_name)
   language_combobox_->setItemData(language_combobox_->count() - 1, locale_name);
 }
 
+void PreferencesGeneralTab::EditDefaultSequenceSettings()
+{
+  SequenceDialog sd(&default_sequence_, SequenceDialog::kExisting, this);
+  sd.SetNameIsEditable(false);
+  sd.exec();
+}
+
 }

app/dialog/preferences/tabs/preferencesgeneraltab.h

@@ -57,6 +57,11 @@ private:
 
   IntegerSlider* autorecovery_maximum_;
 
+  Sequence default_sequence_;
+
+private slots:
+  void EditDefaultSequenceSettings();
+
 };
 
 }

app/node/color/colormanager/colormanager.cpp

@@ -21,7 +21,6 @@
 #include "colormanager.h"
 
 #include <QDir>
-#include <QFloat16>
 #include <QStandardPaths>
 
 #include "common/define.h"

app/node/graph.cpp

@@ -61,6 +61,7 @@ void NodeGraph::childEvent(QChildEvent *event)
       connect(node, &Node::ValueChanged, this, &NodeGraph::ValueChanged);
 
       emit NodeAdded(node);
+      emit node->AddedToGraph(this);
 
     } else if (event->type() == QEvent::ChildRemoved) {
 
@@ -72,6 +73,7 @@ void NodeGraph::childEvent(QChildEvent *event)
       disconnect(node, &Node::ValueChanged, this, &NodeGraph::ValueChanged);
 
       emit NodeRemoved(node);
+      emit node->RemovedFromGraph(this);
 
     }
   }

app/node/node.cpp

@@ -1245,7 +1245,7 @@ bool Node::AreLinked(Node *a, Node *b)
   return a->links_.contains(b);
 }
 
-void Node::AddInput(const QString &id, NodeValue::Type type, const QVariant &default_value, Node::InputFlags flags)
+void Node::InsertInput(const QString &id, NodeValue::Type type, const QVariant &default_value, Node::InputFlags flags, int index)
 {
   if (id.isEmpty()) {
     qWarning() << "Rejected adding input with an empty ID on node" << this->id();
@@ -1264,8 +1264,8 @@ void Node::AddInput(const QString &id, NodeValue::Type type, const QVariant &def
   i.flags = flags;
   i.array_size = 0;
 
-  input_ids_.append(id);
-  input_data_.append(i);
+  input_ids_.insert(index, id);
+  input_data_.insert(index, i);
 
   if (!standard_immediates_.value(id, nullptr)) {
     standard_immediates_.insert(id, CreateImmediate(id));
@@ -2294,7 +2294,7 @@ void NodeSetPositionAndShiftSurroundingsCommand::redo()
 
     // Start moving other nodes
     foreach (Node* surrounding, node_->parent()->nodes()) {
-      if (bounding_rect.contains(surrounding->GetPosition()) && surrounding != node_) {
+      if (bounding_rect.contains(surrounding->GetPosition()) && surrounding != node_ && surrounding != ignore_node_) {
         QPointF new_pos = surrounding->GetPosition();
 
         qreal move_rate = 0.50;
@@ -2306,6 +2306,7 @@ void NodeSetPositionAndShiftSurroundingsCommand::redo()
         new_pos.setY(new_pos.y() + move_rate);
 
         auto sur_command = new NodeSetPositionAndShiftSurroundingsCommand(surrounding, new_pos, true);
+        sur_command->SetIgnoreNode(node_);
         sur_command->redo();
         commands_.append(sur_command);
       }

app/node/node.h

@@ -799,7 +799,23 @@ protected:
 
   };
 
-  void AddInput(const QString& id, NodeValue::Type type, const QVariant& default_value, InputFlags flags = InputFlags(kInputFlagNormal));
+  void InsertInput(const QString& id, NodeValue::Type type, const QVariant& default_value, InputFlags flags, int index);
+
+  void PrependInput(const QString& id, NodeValue::Type type, const QVariant& default_value, InputFlags flags = InputFlags(kInputFlagNormal))
+  {
+    InsertInput(id, type, default_value, flags, 0);
+  }
+
+  void PrependInput(const QString& id, NodeValue::Type type, InputFlags flags = InputFlags(kInputFlagNormal))
+  {
+    PrependInput(id, type, QVariant(), flags);
+  }
+
+  void AddInput(const QString& id, NodeValue::Type type, const QVariant& default_value, InputFlags flags = InputFlags(kInputFlagNormal))
+  {
+    InsertInput(id, type, default_value, flags, input_ids_.size());
+  }
+
   void AddInput(const QString& id, NodeValue::Type type, InputFlags flags = InputFlags(kInputFlagNormal))
   {
     AddInput(id, type, QVariant(), flags);
@@ -926,6 +942,10 @@ signals:
 
   void InputDataTypeChanged(const QString& id, NodeValue::Type type);
 
+  void AddedToGraph(NodeGraph* graph);
+
+  void RemovedFromGraph(NodeGraph* graph);
+
 private:
   class ArrayInsertCommand : public UndoCommand
   {
@@ -1331,7 +1351,8 @@ public:
   NodeSetPositionAndShiftSurroundingsCommand(Node* node, const QPointF& pos, bool move_dependencies_relatively) :
     node_(node),
     position_(pos),
-    move_dependencies_(move_dependencies_relatively)
+    move_dependencies_(move_dependencies_relatively),
+    ignore_node_(nullptr)
   {}
 
   virtual ~NodeSetPositionAndShiftSurroundingsCommand() override
@@ -1353,6 +1374,11 @@ public:
     }
   }
 
+  void SetIgnoreNode(Node* n)
+  {
+    ignore_node_ = n;
+  }
+
 private:
   Node* node_;
 
@@ -1362,6 +1388,8 @@ private:
 
   QVector<UndoCommand*> commands_;
 
+  Node* ignore_node_;
+
 };
 
 class NodeSetPositionAsChildCommand : public UndoCommand

app/node/output/track/track.h

@@ -160,13 +160,15 @@ public:
 
     static Type TypeFromString(const QString& s)
     {
-      if (s.at(1) == ':') {
-        if (s.at(0) == 'v') {
-          // Video stream
-          return Track::kVideo;
-        } else if (s.at(0) == 'a') {
-          // Audio stream
-          return Track::kAudio;
+      if (s.size() >= 3) {
+        if (s.at(1) == ':') {
+          if (s.at(0) == 'v') {
+            // Video stream
+            return Track::kVideo;
+          } else if (s.at(0) == 'a') {
+            // Audio stream
+            return Track::kAudio;
+          }
         }
       }
 

app/node/output/viewer/viewer.cpp

@@ -39,7 +39,8 @@ const uint64_t ViewerOutput::kVideoParamEditMask = VideoParamEdit::kWidthHeight
 ViewerOutput::ViewerOutput(bool create_default_streams) :
   video_frame_cache_(this),
   audio_playback_cache_(this),
-  cache_enabled_(true)
+  video_cache_enabled_(true),
+  audio_cache_enabled_(true)
 {
   AddInput(kVideoParamsInput, NodeValue::kVideoParams, InputFlags(kInputFlagNotConnectable | kInputFlagNotKeyframable | kInputFlagArray));
   SetInputProperty(kVideoParamsInput, QStringLiteral("mask"), QVariant::fromValue(kVideoParamEditMask));
@@ -54,6 +55,7 @@ ViewerOutput::ViewerOutput(bool create_default_streams) :
   if (create_default_streams) {
     AddStream(Track::kVideo, QVariant());
     AddStream(Track::kAudio, QVariant());
+    set_default_parameters();
   }
 }
 
@@ -196,7 +198,7 @@ void ViewerOutput::set_default_parameters()
 
 void ViewerOutput::ShiftVideoCache(const rational &from, const rational &to)
 {
-  if (cache_enabled_) {
+  if (video_cache_enabled_) {
     video_frame_cache_.Shift(from, to);
   }
 
@@ -205,7 +207,7 @@ void ViewerOutput::ShiftVideoCache(const rational &from, const rational &to)
 
 void ViewerOutput::ShiftAudioCache(const rational &from, const rational &to)
 {
-  if (cache_enabled_) {
+  if (audio_cache_enabled_) {
     audio_playback_cache_.Shift(from, to);
   }
 
@@ -222,18 +224,16 @@ void ViewerOutput::InvalidateCache(const TimeRange& range, const QString& from,
 {
   Q_UNUSED(element)
 
-  if (cache_enabled_) {
-    if (from == kTextureInput || from == kSamplesInput
-        || from == kVideoParamsInput || from == kAudioParamsInput) {
-      TimeRange invalidated_range(qMax(rational(), range.in()),
-                                  qMin(GetLength(), range.out()));
+  if ((video_cache_enabled_ && (from == kTextureInput || from == kVideoParamsInput))
+      || (audio_cache_enabled_ && (from == kSamplesInput || from == kAudioParamsInput))) {
+    TimeRange invalidated_range(qMax(rational(), range.in()),
+                                qMin(GetLength(), range.out()));
 
-      if (invalidated_range.in() != invalidated_range.out()) {
-        if (from == kTextureInput || from == kVideoParamsInput) {
-          video_frame_cache_.Invalidate(invalidated_range, job_time);
-        } else {
-          audio_playback_cache_.Invalidate(invalidated_range, job_time);
-        }
+    if (invalidated_range.in() != invalidated_range.out()) {
+      if (from == kTextureInput || from == kVideoParamsInput) {
+        video_frame_cache_.Invalidate(invalidated_range, job_time);
+      } else {
+        audio_playback_cache_.Invalidate(invalidated_range, job_time);
       }
     }
   }
@@ -257,11 +257,6 @@ QVector<QString> ViewerOutput::inputs_for_output(const QString &output) const
   return inputs;
 }
 
-const rational& ViewerOutput::GetLength() const
-{
-  return last_length_;
-}
-
 QVector<Track::Reference> ViewerOutput::GetEnabledStreamsAsReferences() const
 {
   QVector<Track::Reference> refs;
@@ -302,41 +297,21 @@ void ViewerOutput::Retranslate()
 
 void ViewerOutput::VerifyLength()
 {
-  NodeTraverser traverser;
+  rational subtitle_length;
 
-  rational video_length, audio_length, subtitle_length;
-
-  {
-    video_length = GetCustomLength(Track::kVideo);
-
-    if (video_length.isNull() && IsInputConnected(kTextureInput)) {
-      NodeValueTable t = traverser.GenerateTable(GetConnectedOutput(kTextureInput), TimeRange(0, 0));
-      video_length = t.Get(NodeValue::kRational, QStringLiteral("length")).value<rational>();
-    }
-
-    if (cache_enabled_) {
-      video_frame_cache_.SetLength(video_length);
-    }
+  video_length_ = VerifyLengthInternal(Track::kVideo);
+  if (video_cache_enabled_) {
+    video_frame_cache_.SetLength(video_length_);
   }
 
-  {
-    audio_length = GetCustomLength(Track::kAudio);
-
-    if (audio_length.isNull() && IsInputConnected(kSamplesInput)) {
-      NodeValueTable t = traverser.GenerateTable(GetConnectedOutput(kSamplesInput), TimeRange(0, 0));
-      audio_length = t.Get(NodeValue::kRational, QStringLiteral("length")).value<rational>();
-    }
-
-    if (cache_enabled_) {
-      audio_playback_cache_.SetLength(audio_length);
-    }
+  audio_length_ = VerifyLengthInternal(Track::kAudio);
+  if (audio_cache_enabled_) {
+    audio_playback_cache_.SetLength(audio_length_);
   }
 
-  {
-    subtitle_length = GetCustomLength(Track::kSubtitle);
-  }
+  subtitle_length = VerifyLengthInternal(Track::kSubtitle);
 
-  rational real_length = qMax(subtitle_length, qMax(video_length, audio_length));
+  rational real_length = qMax(subtitle_length, qMax(video_length_, audio_length_));
 
   if (real_length != last_length_) {
     last_length_ = real_length;
@@ -362,9 +337,30 @@ void ViewerOutput::InputDisconnectedEvent(const QString &input, int element, con
   super::InputDisconnectedEvent(input, element, output);
 }
 
-rational ViewerOutput::GetCustomLength(Track::Type type) const
+rational ViewerOutput::VerifyLengthInternal(Track::Type type) const
 {
-  Q_UNUSED(type)
+  NodeTraverser traverser;
+
+  switch (type) {
+  case Track::kVideo:
+    if (IsInputConnected(kTextureInput)) {
+      NodeValueTable t = traverser.GenerateTable(GetConnectedOutput(kTextureInput), TimeRange(0, 0));
+      qDebug() << "Got video length:" << t.Get(NodeValue::kRational, QStringLiteral("length")).value<rational>();
+      return t.Get(NodeValue::kRational, QStringLiteral("length")).value<rational>();
+    }
+    break;
+  case Track::kAudio:
+    if (IsInputConnected(kSamplesInput)) {
+      NodeValueTable t = traverser.GenerateTable(GetConnectedOutput(kSamplesInput), TimeRange(0, 0));
+      return t.Get(NodeValue::kRational, QStringLiteral("length")).value<rational>();
+    }
+    break;
+  case Track::kNone:
+  case Track::kSubtitle:
+  case Track::kCount:
+    break;
+  }
+
   return rational();
 }
 
@@ -403,7 +399,7 @@ void ViewerOutput::InputValueChangedEvent(const QString &input, int element)
       }
 
       if (frame_rate_changed) {
-        if (cache_enabled_) {
+        if (video_cache_enabled_) {
           video_frame_cache_.SetTimebase(new_video_params.frame_rate_as_time_base());
         }
         emit FrameRateChanged(new_video_params.frame_rate());
@@ -425,7 +421,7 @@ void ViewerOutput::InputValueChangedEvent(const QString &input, int element)
 
       emit AudioParamsChanged();
 
-      if (cache_enabled_) {
+      if (audio_cache_enabled_) {
         audio_playback_cache_.SetParameters(GetAudioParams());
       }
 
@@ -529,11 +525,6 @@ int ViewerOutput::AddStream(Track::Type type, const QVariant& value)
   return index;
 }
 
-void ViewerOutput::SetViewerCacheEnabled(bool e)
-{
-  cache_enabled_ = e;
-}
-
 void ViewerOutput::InputResized(const QString &input, int old_size, int new_size)
 {
   if (input == kVideoParamsInput || input == kAudioParamsInput) {

app/node/output/viewer/viewer.h

@@ -72,12 +72,24 @@ public:
 
   VideoParams GetVideoParams(int index = 0) const
   {
-    return GetStandardValue(kVideoParamsInput, index).value<VideoParams>();
+    // This check isn't strictly necessary (GetStandardValue will return a null VideoParams anyway),
+    // but it does suppress a warning message that we don't need
+    if (index < InputArraySize(kVideoParamsInput)) {
+      return GetStandardValue(kVideoParamsInput, index).value<VideoParams>();
+    } else {
+      return VideoParams();
+    }
   }
 
   AudioParams GetAudioParams(int index = 0) const
   {
-    return GetStandardValue(kAudioParamsInput, index).value<AudioParams>();
+    // This check isn't strictly necessary (GetStandardValue will return a null VideoParams anyway),
+    // but it does suppress a warning message that we don't need
+    if (index < InputArraySize(kAudioParamsInput)) {
+      return GetStandardValue(kAudioParamsInput, index).value<AudioParams>();
+    } else {
+      return AudioParams();
+    }
   }
 
   void SetVideoParams(const VideoParams &video, int index = 0)
@@ -111,7 +123,9 @@ public:
   VideoParams GetFirstEnabledVideoStream() const;
   AudioParams GetFirstEnabledAudioStream() const;
 
-  const rational &GetLength() const;
+  const rational &GetLength() const { return last_length_; }
+  const rational &GetVideoLength() const { return video_length_; }
+  const rational &GetAudioLength() const { return audio_length_; }
 
   FrameHashCache* video_frame_cache()
   {
@@ -174,7 +188,7 @@ protected:
 
   virtual void InputDisconnectedEvent(const QString &input, int element, const NodeOutput &output) override;
 
-  virtual rational GetCustomLength(Track::Type type) const;
+  virtual rational VerifyLengthInternal(Track::Type type) const;
 
   virtual void ShiftVideoEvent(const rational &from, const rational &to);
 
@@ -188,10 +202,13 @@ protected:
 
   int AddStream(Track::Type type, const QVariant &value);
 
-  void SetViewerCacheEnabled(bool e);
+  void SetViewerVideoCacheEnabled(bool e) { video_cache_enabled_ = e; }
+  void SetViewerAudioCacheEnabled(bool e) { audio_cache_enabled_ = e; }
 
 private:
   rational last_length_;
+  rational video_length_;
+  rational audio_length_;
 
   FrameHashCache video_frame_cache_;
 
@@ -205,7 +222,8 @@ private:
 
   TimelinePoints timeline_points_;
 
-  bool cache_enabled_;
+  bool video_cache_enabled_;
+  bool audio_cache_enabled_;
 
 private slots:
   void InputResized(const QString& input, int old_size, int new_size);

app/node/project/footage/footage.cpp

@@ -43,14 +43,14 @@ Footage::Footage(const QString &filename) :
   ViewerOutput(false),
   cancelled_(nullptr)
 {
-  AddInput(kFilenameInput, NodeValue::kFile, InputFlags(kInputFlagNotConnectable | kInputFlagNotKeyframable));
+  SetCacheTextures(true);
+  SetViewerVideoCacheEnabled(false);
+
+  PrependInput(kFilenameInput, NodeValue::kFile, InputFlags(kInputFlagNotConnectable | kInputFlagNotKeyframable));
 
   Clear();
 
   set_filename(filename);
-
-  SetCacheTextures(true);
-  SetViewerCacheEnabled(false);
 }
 
 void Footage::Retranslate()
@@ -180,7 +180,7 @@ void Footage::InputValueChangedEvent(const QString &input, int element)
   }
 }
 
-rational Footage::GetCustomLength(Track::Type type) const
+rational Footage::VerifyLengthInternal(Track::Type type) const
 {
   if (type == Track::kVideo) {
     VideoParams first_stream = GetFirstEnabledVideoStream();
@@ -196,7 +196,7 @@ rational Footage::GetCustomLength(Track::Type type) const
     }
   }
 
-  return super::GetCustomLength(type);
+  return super::VerifyLengthInternal(type);
 }
 
 QString Footage::GetColorspaceToUse(const VideoParams &params) const
@@ -295,10 +295,9 @@ QString Footage::DescribeVideoStream(const VideoParams &params)
 
 QString Footage::DescribeAudioStream(const AudioParams &params)
 {
-  return tr("%1: Audio - %2 Channel(s), %3Hz")
-      .arg(QString::number(params.stream_index()),
-           QString::number(params.channel_count()),
-           QString::number(params.sample_rate()));
+  return tr("%1: Audio - %n Channel(s), %2Hz", nullptr, params.channel_count())
+    .arg(QString::number(params.stream_index()),
+         QString::number(params.sample_rate()));
 }
 
 void Footage::Hash(const QString& output, QCryptographicHash &hash, const rational &time) const

app/node/project/footage/footage.h

@@ -58,7 +58,7 @@ public:
 
   virtual QString Name() const override
   {
-    return tr("Footage");
+    return tr("Media");
   }
 
   virtual QString id() const override
@@ -195,7 +195,7 @@ protected:
 
   virtual void InputValueChangedEvent(const QString &input, int element) override;
 
-  virtual rational GetCustomLength(Track::Type type) const override;
+  virtual rational VerifyLengthInternal(Track::Type type) const override;
 
 private:
   QString GetColorspaceToUse(const VideoParams& params) const;

app/node/project/projectviewmodel.cpp

@@ -430,9 +430,6 @@ void ProjectViewModel::ConnectItem(Node *n)
     connect(f, &Folder::BeginRemoveItem, this, &ProjectViewModel::FolderBeginRemoveItem);
     connect(f, &Folder::EndRemoveItem, this, &ProjectViewModel::FolderEndRemoveItem);
 
-    connect(f, &Folder::BeginInsertItem, this, &ProjectViewModel::ItemAdded);
-    connect(f, &Folder::BeginRemoveItem, this, &ProjectViewModel::ItemRemoved);
-
     foreach (Node* c, f->children()) {
       ConnectItem(c);
     }
@@ -450,9 +447,6 @@ void ProjectViewModel::DisconnectItem(Node *n)
     disconnect(f, &Folder::BeginRemoveItem, this, &ProjectViewModel::FolderBeginRemoveItem);
     disconnect(f, &Folder::EndRemoveItem, this, &ProjectViewModel::FolderEndRemoveItem);
 
-    disconnect(f, &Folder::BeginInsertItem, this, &ProjectViewModel::ItemAdded);
-    disconnect(f, &Folder::BeginRemoveItem, this, &ProjectViewModel::ItemRemoved);
-
     foreach (Node* c, f->children()) {
       DisconnectItem(c);
     }

app/node/project/projectviewmodel.h

@@ -104,11 +104,6 @@ public:
    */
   QModelIndex CreateIndexFromItem(Node *item, int column = 0);
 
-signals:
-  void ItemAdded(Node* node);
-
-  void ItemRemoved(Node* node);
-
 private:
   /**
    * @brief Retrieve the index of `item` in its parent

app/node/project/sequence/sequence.cpp

@@ -107,7 +107,7 @@ void Sequence::Retranslate()
   }
 }
 
-rational Sequence::GetCustomLength(Track::Type type) const
+rational Sequence::VerifyLengthInternal(Track::Type type) const
 {
   if (!track_lists_.isEmpty()) {
     switch (type) {

app/node/project/sequence/sequence.h

@@ -103,7 +103,7 @@ protected:
 
   virtual void InputDisconnectedEvent(const QString &input, int element, const NodeOutput &output) override;
 
-  virtual rational GetCustomLength(Track::Type type) const override;
+  virtual rational VerifyLengthInternal(Track::Type type) const override;
 
 signals:
   void TrackAdded(Track* track);

app/node/value.cpp

@@ -382,14 +382,26 @@ NodeValueTable NodeValueTable::Merge(QList<NodeValueTable> tables)
   NodeValueTable merged_table;
 
   // Slipstreams all tables together
-  foreach (const NodeValueTable& t, tables) {
-    if (row >= t.Count()) {
-      continue;
+  while (true) {
+    bool all_merged = true;
+
+    foreach (const NodeValueTable& t, tables) {
+      if (row < t.Count()) {
+        all_merged = false;
+      } else {
+        continue;
+      }
+
+      int row_index = t.Count() - 1 - row;
+
+      merged_table.Prepend(t.at(row_index));
     }
 
-    int row_index = t.Count() - 1 - row;
+    row++;
 
-    merged_table.Prepend(t.at(row_index));
+    if (all_merged) {
+      break;
+    }
   }
 
   return merged_table;

app/panel/project/project.cpp

@@ -57,7 +57,6 @@ ProjectPanel::ProjectPanel(QWidget *parent) :
   explorer_ = new ProjectExplorer(this);
   layout->addWidget(explorer_);
   connect(explorer_, &ProjectExplorer::DoubleClickedItem, this, &ProjectPanel::ItemDoubleClickSlot);
-  connect(explorer_, &ProjectExplorer::ItemRemoved, this, &ProjectPanel::ItemRemoved);
 
   // Set toolbar's view to the explorer's view
   toolbar->SetView(explorer_->view_type());
@@ -233,16 +232,6 @@ void ProjectPanel::SaveConnectedProject()
   Core::instance()->SaveProject(this->project());
 }
 
-void ProjectPanel::ItemRemoved(Node *item)
-{
-  // Open this footage in a FootageViewer
-  FootageViewerPanel* panel = PanelManager::instance()->MostRecentlyFocused<FootageViewerPanel>();
-
-  if (panel->GetConnectedViewer() == item) {
-    panel->DisconnectViewerNode();
-  }
-}
-
 QVector<ViewerOutput *> ProjectPanel::GetSelectedFootage() const
 {
   QVector<Node*> items = SelectedItems();

app/panel/project/project.h

@@ -80,8 +80,6 @@ private slots:
 
   void SaveConnectedProject();
 
-  void ItemRemoved(Node* item);
-
 };
 
 }

app/panel/viewer/viewer.cpp

@@ -25,13 +25,13 @@ namespace olive {
 ViewerPanel::ViewerPanel(const QString &object_name, QWidget *parent) :
   ViewerPanelBase(object_name, parent)
 {
-  // Set ViewerWidget as the central widget
-  ViewerWidget* vw = new ViewerWidget();
-  connect(vw, &ViewerWidget::RequestScopePanel, this, &ViewerPanel::CreateScopePanel);
-  SetTimeBasedWidget(vw);
+  Init();
+}
 
-  // Set strings
-  Retranslate();
+ViewerPanel::ViewerPanel(QWidget *parent) :
+  ViewerPanelBase(QStringLiteral("ViewerPanel"), parent)
+{
+  Init();
 }
 
 void ViewerPanel::Retranslate()
@@ -41,4 +41,15 @@ void ViewerPanel::Retranslate()
   SetTitle(tr("Viewer"));
 }
 
+void ViewerPanel::Init()
+{
+  // Set ViewerWidget as the central widget
+  ViewerWidget* vw = new ViewerWidget();
+  connect(vw, &ViewerWidget::RequestScopePanel, this, &ViewerPanel::CreateScopePanel);
+  SetTimeBasedWidget(vw);
+
+  // Set strings
+  Retranslate();
+}
+
 }

app/panel/viewer/viewer.h

@@ -34,10 +34,14 @@ class ViewerPanel : public ViewerPanelBase {
   Q_OBJECT
 public:
   ViewerPanel(const QString& object_name, QWidget* parent);
+  ViewerPanel(QWidget* parent);
 
 protected:
   virtual void Retranslate() override;
 
+private:
+  void Init();
+
 };
 
 }

app/render/audioplaybackcache.cpp

@@ -479,6 +479,7 @@ qint64 AudioPlaybackCache::PlaybackDevice::readData(char *data, qint64 maxSize)
       }
     } else {
       qWarning() << "Failed to read data from segment";
+      break;
     }
   }
 

app/render/framehashcache.cpp

@@ -197,6 +197,11 @@ bool FrameHashCache::SaveCacheFrame(const QByteArray &hash, FramePtr frame) cons
 
 bool FrameHashCache::SaveCacheFrame(const QString &cache_path, const QByteArray &hash, char *data, const VideoParams &vparam, int linesize_bytes)
 {
+  if (cache_path.isEmpty()) {
+    qWarning() << "Failed to save cache frame with empty path";
+    return false;
+  }
+
   QString fn = CachePathName(cache_path, hash);
 
   if (SaveCacheFrame(fn, data, vparam, linesize_bytes)) {
@@ -226,6 +231,11 @@ bool FrameHashCache::SaveCacheFrame(const QString &cache_path, const QByteArray
 
 FramePtr FrameHashCache::LoadCacheFrame(const QString &cache_path, const QByteArray &hash)
 {
+  if (cache_path.isEmpty()) {
+    qWarning() << "Failed to save cache frame with empty path";
+    return nullptr;
+  }
+
   return LoadCacheFrame(CachePathName(cache_path, hash));
 }
 

app/render/previewautocacher.cpp

@@ -678,10 +678,6 @@ void PreviewAutoCacher::SetViewerNode(ViewerOutput *viewer_node)
     copied_viewer_node_ = static_cast<ViewerOutput*>(copy_map_.value(viewer_node_));
     copied_color_manager_ = static_cast<ColorManager*>(copy_map_.value(viewer_node_->project()->color_manager()));
 
-    // Copy parameters
-    copied_viewer_node_->SetVideoParams(viewer_node_->GetVideoParams());
-    copied_viewer_node_->SetAudioParams(viewer_node_->GetAudioParams());
-
     // Add all connections
     foreach (Node* node, graph->nodes()) {
       for (auto it=node->input_connections().cbegin(); it!=node->input_connections().cend(); it++) {

app/render/renderer.cpp

@@ -20,8 +20,6 @@
 
 #include "renderer.h"
 
-#include <QFloat16>
-
 #include "common/ocioutils.h"
 
 namespace olive {

app/render/renderprocessor.cpp

@@ -540,13 +540,17 @@ QVariant RenderProcessor::ProcessFrameGeneration(const Node *node, const Generat
 
 bool RenderProcessor::CanCacheFrames()
 {
-  return true;
+  return ticket_->property("type").value<RenderManager::TicketType>() == RenderManager::kTypeVideo;
 }
 
 QVariant RenderProcessor::GetCachedTexture(const QByteArray& hash)
 {
-  VideoParams video_params = GetCacheVideoParams();
   QString cache_dir = ticket_->property("cache").toString();
+  if (cache_dir.isEmpty()) {
+    return QVariant();
+  }
+
+  VideoParams video_params = GetCacheVideoParams();
 
   FramePtr f = FrameHashCache::LoadCacheFrame(cache_dir, hash);
 

app/task/project/import/import.cpp

@@ -41,7 +41,7 @@ ProjectImportTask::ProjectImportTask(ProjectViewModel *model, Folder *folder, co
 
   file_count_ = Core::CountFilesInFileList(filenames_);
 
-  SetTitle(tr("Importing %1 file(s)").arg(file_count_));
+  SetTitle(tr("Importing %n file(s)", nullptr, file_count_));
 }
 
 const int &ProjectImportTask::GetFileCount() const
@@ -139,7 +139,8 @@ void ProjectImportTask::ValidateImageSequence(Footage *footage, QFileInfoList& i
   // By this point we've established that video contains a single still image stream. Now we'll
   // see if it ends with numbers.
   if (Decoder::GetImageSequenceDigitCount(footage->filename()) > 0
-      && !image_sequence_ignore_files_.contains(footage->filename())) {
+      && !image_sequence_ignore_files_.contains(footage->filename())
+      && footage->InputArraySize(Footage::kVideoParamsInput)) {
     VideoParams video_stream = footage->GetVideoParams(0);
     QSize dim(video_stream.width(), video_stream.height());
 

app/widget/audiomonitor/audiomonitor.cpp

@@ -36,11 +36,12 @@ const int kMaximumSmoothness = 8;
 AudioMonitor::AudioMonitor(QWidget *parent) :
   QOpenGLWidget(parent),
   file_(nullptr),
+  waveform_(nullptr),
   cached_channels_(0)
 {
   values_.resize(kMaximumSmoothness);
 
-  connect(AudioManager::instance(), &AudioManager::OutputDeviceStarted, this, &AudioMonitor::OutputDeviceSet);
+  connect(AudioManager::instance(), &AudioManager::OutputWaveformStarted, this, &AudioMonitor::OutputAudioVisualWaveformSet);
   connect(AudioManager::instance(), &AudioManager::OutputPushed, this, &AudioMonitor::OutputPushed);
   connect(AudioManager::instance(), &AudioManager::AudioParamsChanged, this, &AudioMonitor::SetParams);
   connect(AudioManager::instance(), &AudioManager::Stopped, this, &AudioMonitor::Stop);
@@ -84,6 +85,7 @@ void AudioMonitor::Stop()
 {
   delete file_;
   file_ = nullptr;
+  waveform_ = nullptr;
 }
 
 void AudioMonitor::OutputPushed(const QByteArray &d)
@@ -97,6 +99,20 @@ void AudioMonitor::OutputPushed(const QByteArray &d)
   SetUpdateLoop(true);
 }
 
+void AudioMonitor::OutputAudioVisualWaveformSet(const AudioVisualWaveform *waveform, const rational &start, int playback_speed)
+{
+  Stop();
+
+  waveform_ = waveform;
+  waveform_time_ = start;
+
+  playback_speed_ = playback_speed;
+
+  last_time_ = QDateTime::currentMSecsSinceEpoch();
+
+  SetUpdateLoop(true);
+}
+
 void AudioMonitor::SetUpdateLoop(bool e)
 {
   if (e) {
@@ -211,8 +227,24 @@ void AudioMonitor::paintGL()
 
   QVector<double> v(params_.channel_count(), 0);
 
-  if (file_) {
-    UpdateValuesFromFile(v);
+  if (file_ || waveform_) {
+    // Determines how many milliseconds have passed since last update
+    qint64 current_time = QDateTime::currentMSecsSinceEpoch();
+    qint64 delta_time = current_time - last_time_;
+    int abs_speed = qAbs(playback_speed_);
+
+    // Multiply by speed if the speed is not 1
+    if (abs_speed != 1) {
+      delta_time *= abs_speed;
+    }
+
+    if (file_) {
+      UpdateValuesFromFile(v, delta_time);
+    } else if (waveform_) {
+      UpdateValuesFromWaveform(v, delta_time);
+    }
+
+    last_time_ = current_time;
   }
 
   PushValue(v);
@@ -254,7 +286,7 @@ void AudioMonitor::paintGL()
     }
   }
 
-  if (all_zeroes && !file_) {
+  if (all_zeroes && !file_ && !waveform_) {
     // Optimize by disabling the update loop
     SetUpdateLoop(false);
   }
@@ -266,20 +298,10 @@ void AudioMonitor::mousePressEvent(QMouseEvent *)
   update();
 }
 
-void AudioMonitor::UpdateValuesFromFile(QVector<double>& v)
+void AudioMonitor::UpdateValuesFromFile(QVector<double>& v, qint64 delta_time)
 {
-  // Determines how many milliseconds have passed since last update
-  qint64 current_time = QDateTime::currentMSecsSinceEpoch();
-  qint64 time_passed = current_time - last_time_;
-  int abs_speed = qAbs(playback_speed_);
-
-  // Multiply by speed if the speed is not 1
-  if (abs_speed != 1) {
-    time_passed *= abs_speed;
-  }
-
   // Convert ms to float seconds and determine how many bytes that is
-  qint64 bytes_to_read = params_.time_to_bytes(static_cast<double>(time_passed) * 0.001);
+  qint64 bytes_to_read = params_.time_to_bytes(static_cast<double>(delta_time) * 0.001);
 
   if (playback_speed_ < 0) {
     // If reversing, jump back by the amount of bytes we're going to read
@@ -297,31 +319,35 @@ void AudioMonitor::UpdateValuesFromFile(QVector<double>& v)
     file_->seek(file_->pos() - bytes_to_read);
   }
 
-  // If speed is not 1, transform it here
-  if (abs_speed != 1) {
-    int sample_sz = params_.samples_to_bytes(1);
-    int in_nb_samples = params_.bytes_to_samples(b.size());
-    int out_nb_samples = in_nb_samples / abs_speed;
-    QByteArray speed_adjusted(out_nb_samples * sample_sz, Qt::Uninitialized);
+  BytesToSampleSummary(b, v);
+}
 
-    for (int i=0;i<out_nb_samples;i++) {
-      memcpy(speed_adjusted.data() + i * sample_sz,
-             b.constData() + i * abs_speed * sample_sz,
-             sample_sz);
+void AudioMonitor::UpdateValuesFromWaveform(QVector<double> &v, qint64 delta_time)
+{
+  // Delta time is provided in milliseconds, so we convert to seconds in rational
+  rational length(delta_time, 1000);
+
+  AudioVisualWaveform::Sample sum = waveform_->GetSummaryFromTime(waveform_time_, length);
+
+  for (int i=0; i<sum.size(); i++) {
+    float max = qMax(qAbs(sum.at(i).min), qAbs(sum.at(i).max));
+
+    int output_index = i%v.size();
+    if (max > v.at(output_index)) {
+      v[output_index] = max;
     }
-
-    b = speed_adjusted;
   }
 
-  BytesToSampleSummary(b, v);
-
-  last_time_ = current_time;
+  waveform_time_ += length;
 }
 
 void AudioMonitor::PushValue(const QVector<double> &v)
 {
-  values_.removeFirst();
-  values_.append(v);
+  int lim = values_.size()-1;
+  for (int i=0; i<lim; i++) {
+    values_[i] = values_[i+1];
+  }
+  values_[lim] = v;
 }
 
 void AudioMonitor::BytesToSampleSummary(const QByteArray &b, QVector<double> &v)

app/widget/audiomonitor/audiomonitor.h

@@ -25,6 +25,7 @@
 #include <QOpenGLWidget>
 #include <QTimer>
 
+#include "audio/audiovisualwaveform.h"
 #include "common/define.h"
 #include "render/audioparams.h"
 #include "render/audioplaybackcache.h"
@@ -46,8 +47,9 @@ public slots:
 
   void OutputPushed(const QByteArray& d);
 
+  void OutputAudioVisualWaveformSet(const AudioVisualWaveform *waveform, const rational& start, int playback_speed);
+
 protected:
-  //virtual void paintEvent(QPaintEvent* event) override;
   virtual void paintGL() override;
 
   virtual void mousePressEvent(QMouseEvent* event) override;
@@ -55,7 +57,9 @@ protected:
 private:
   void SetUpdateLoop(bool e);
 
-  void UpdateValuesFromFile(QVector<double> &v);
+  void UpdateValuesFromFile(QVector<double> &v, qint64 delta_time);
+
+  void UpdateValuesFromWaveform(QVector<double> &v, qint64 delta_time);
 
   void PushValue(const QVector<double>& v);
 
@@ -68,6 +72,9 @@ private:
   QIODevice* file_;
   qint64 last_time_;
 
+  const AudioVisualWaveform* waveform_;
+  rational waveform_time_;
+
   int playback_speed_;
 
   QVector< QVector<double> > values_;

app/widget/nodeparamview/nodeparamviewarraywidget.cpp

@@ -53,7 +53,7 @@ void NodeParamViewArrayWidget::UpdateCounter(const QString& input, int old_size,
 {
   Q_UNUSED(old_size)
   if (input == input_) {
-    count_lbl_->setText(tr("%1 element(s)").arg(new_size));
+    count_lbl_->setText(tr("%n element(s)", nullptr, new_size));
   }
 }
 

app/widget/nodeparamview/nodeparamviewitem.cpp

@@ -381,7 +381,7 @@ void NodeParamViewItemBody::Retranslate()
 
     if (ic.IsArray() && ic.element() >= 0) {
       // Make the label the array index
-      i.value().main_label->setText(tr("%n:", nullptr, ic.element()));
+      i.value().main_label->setText(tr("%1:").arg(ic.element()));
     } else {
       // Set to the input's name
       i.value().main_label->setText(tr("%1:").arg(ic.name()));

app/widget/nodeparamview/nodeparamviewwidgetbridge.cpp

@@ -557,7 +557,7 @@ void NodeParamViewWidgetBridge::InputValueChanged(const NodeInput &input, const
 
 void NodeParamViewWidgetBridge::PropertyChanged(const QString& input, const QString &key, const QVariant &value)
 {
-  if (input != input_.input()) {
+  if (input != input_.input() || (input_.IsArray() && input_.element() == -1)) {
     return;
   }
 

app/widget/nodeview/nodeview.cpp

@@ -668,6 +668,13 @@ void NodeView::ShowContextMenu(const QPoint &pos)
     QAction* autopos = m.addAction(tr("Auto-Position"));
     connect(autopos, &QAction::triggered, this, &NodeView::AutoPositionDescendents);
 
+    ViewerOutput* viewer = dynamic_cast<ViewerOutput*>(selected.first()->GetNode());
+    if (viewer) {
+      m.addSeparator();
+      QAction* open_in_viewer_action = m.addAction(tr("Open in Viewer"));
+      connect(open_in_viewer_action, &QAction::triggered, this, &NodeView::OpenSelectedNodeInViewer);
+    }
+
   } else {
 
     QAction* curved_action = m.addAction(tr("Smooth Edges"));
@@ -756,6 +763,16 @@ void NodeView::ContextMenuFilterChanged(QAction *action)
   Q_UNUSED(action)
 }
 
+void NodeView::OpenSelectedNodeInViewer()
+{
+  QVector<Node*> selected = scene_.GetSelectedNodes();
+  ViewerOutput* viewer = selected.isEmpty() ? nullptr : dynamic_cast<ViewerOutput*>(selected.first());
+
+  if (viewer) {
+    Core::instance()->OpenNodeInViewer(viewer);
+  }
+}
+
 void NodeView::AttachNodesToCursor(const QVector<Node *> &nodes)
 {
   QVector<NodeViewItem*> items(nodes.size());

app/widget/nodeview/nodeview.h

@@ -194,6 +194,11 @@ private slots:
    */
   void ContextMenuFilterChanged(QAction* action);
 
+  /**
+   * @brief Opens the selected node in a Viewer
+   */
+  void OpenSelectedNodeInViewer();
+
 };
 
 }

app/widget/projectexplorer/projectexplorer.cpp

@@ -95,8 +95,6 @@ ProjectExplorer::ProjectExplorer(QWidget *parent) :
   connect(tree_view_, &ProjectExplorerTreeView::customContextMenuRequested, this, &ProjectExplorer::ShowContextMenu);
   connect(list_view_, &ProjectExplorerListView::customContextMenuRequested, this, &ProjectExplorer::ShowContextMenu);
   connect(icon_view_, &ProjectExplorerIconView::customContextMenuRequested, this, &ProjectExplorer::ShowContextMenu);
-
-  connect(&model_, &ProjectViewModel::ItemRemoved, this, &ProjectExplorer::ItemRemoved);
 }
 
 const ProjectToolbar::ViewType &ProjectExplorer::view_type() const

app/widget/projectexplorer/projectexplorer.h

@@ -100,8 +100,6 @@ signals:
    */
   void DoubleClickedItem(Node* item);
 
-  void ItemRemoved(Node* node);
-
 private:
   /**
    * @brief Get all the blocks that solely rely on an input node

app/widget/slider/sliderbase.cpp

@@ -39,6 +39,7 @@ SliderBase::SliderBase(Mode mode, QWidget *parent) :
   dragged_diff_(0),
   require_valid_input_(true),
   tristate_(false),
+  format_plural_(false),
   drag_ladder_(nullptr),
   ladder_element_count_(0),
   dragged_(false)
@@ -102,9 +103,10 @@ bool SliderBase::IsDragging() const
   return drag_ladder_;
 }
 
-void SliderBase::SetFormat(const QString &s)
+void SliderBase::SetFormat(const QString &s, const bool plural)
 {
   custom_format_ = s;
+  format_plural_ = plural;
   ForceLabelUpdate();
 }
 
@@ -114,6 +116,11 @@ void SliderBase::ClearFormat()
   ForceLabelUpdate();
 }
 
+bool SliderBase::IsFormatPlural() const
+{
+  return format_plural_;
+}
+
 void SliderBase::ForceLabelUpdate()
 {
   UpdateLabel(Value());
@@ -228,10 +235,17 @@ QString SliderBase::GetFormat() const
   }
 }
 
+bool SliderBase::UsingLadders() const
+{
+  return ladder_element_count_ > 0 && Config::Current()[QStringLiteral("UseSliderLadders")].toBool();
+}
+
 void SliderBase::UpdateLabel(const QVariant &v)
 {
   if (tristate_) {
     label_->setText("---");
+  } else if (format_plural_) {
+    label_->setText(tr(GetFormat().toUtf8().constData(), nullptr, v.toInt()));
   } else {
     label_->setText(GetFormat().arg(ValueToString(v)));
   }
@@ -322,7 +336,7 @@ void SliderBase::LadderDragged(int value, double multiplier)
 
     drag_ladder_->SetValue(ValueToString(clamped_temp_dragged_value_));
 
-    if (!Config::Current()[QStringLiteral("UseSliderLadders")].toBool()) {
+    if (!UsingLadders()) {
       RepositionLadder();
     }
 
@@ -437,7 +451,7 @@ void SliderBase::ResetValue()
 void SliderBase::RepositionLadder()
 {
   if (drag_ladder_) {
-    if (Config::Current()[QStringLiteral("UseSliderLadders")].toBool()) {
+    if (UsingLadders()) {
       drag_ladder_->move(QCursor::pos() - QPoint(drag_ladder_->width()/2, drag_ladder_->height()/2));
     } else {
       QPoint label_global_pos = label_->mapToGlobal(label_->pos());

app/widget/slider/sliderbase.h

@@ -61,9 +61,11 @@ public:
 
   bool IsDragging() const;
 
-  void SetFormat(const QString& s);
+  void SetFormat(const QString& s, const bool plural=false);
   void ClearFormat();
 
+  bool IsFormatPlural() const;
+
   void SetLadderElementCount(int b)
   {
     ladder_element_count_ = b;
@@ -102,6 +104,8 @@ private:
 
   QString GetFormat() const;
 
+  bool UsingLadders() const;
+
   SliderLabel* label_;
 
   FocusableLineEdit* editor_;
@@ -130,6 +134,8 @@ private:
 
   QString custom_format_;
 
+  bool format_plural_;
+
   SliderLadder* drag_ladder_;
 
   int ladder_element_count_;

app/widget/slider/sliderladder.cpp

@@ -77,7 +77,7 @@ SliderLadder::SliderLadder(double drag_multiplier, int nb_outer_values, QString
   drag_timer_.setInterval(10);
   connect(&drag_timer_, &QTimer::timeout, this, &SliderLadder::TimerUpdate);
 
-  if (Config::Current()[QStringLiteral("UseSliderLadders")].toBool()) {
+  if (UsingLadders()) {
     drag_start_x_ = -1;
   } else {
 #if defined(Q_OS_MAC)
@@ -95,7 +95,7 @@ SliderLadder::SliderLadder(double drag_multiplier, int nb_outer_values, QString
 
 SliderLadder::~SliderLadder()
 {
-  if (Config::Current()[QStringLiteral("UseSliderLadders")].toBool()) {
+  if (UsingLadders()) {
 
   } else {
 #if defined(Q_OS_MAC)
@@ -143,7 +143,7 @@ void SliderLadder::TimerUpdate()
   int ladder_right = this->x() + this->width() - 1;
   int now_pos = QCursor::pos().x();
 
-  if (Config::Current()[QStringLiteral("UseSliderLadders")].toBool()) {
+  if (UsingLadders()) {
 
     bool is_under_mouse = (now_pos >= ladder_left && now_pos <= ladder_right);
 
@@ -227,7 +227,12 @@ void SliderLadder::TimerUpdate()
   }
 }
 
-SliderLadderElement::SliderLadderElement(const double &multiplier, QString width_hint, QWidget *parent) :
+bool SliderLadder::UsingLadders() const
+{
+  return elements_.size() > 1;
+}
+
+  SliderLadderElement::SliderLadderElement(const double &multiplier, QString width_hint, QWidget *parent) :
   QWidget(parent),
   multiplier_(multiplier),
   highlighted_(false),

app/widget/slider/sliderladder.h

@@ -83,6 +83,8 @@ signals:
   void Released();
 
 private:
+  bool UsingLadders() const;
+
   int drag_start_x_;
   int drag_start_y_;
 

app/widget/timebased/timebasedwidget.cpp

@@ -85,6 +85,7 @@ void TimeBasedWidget::ConnectViewerNode(ViewerOutput *node)
 
     // Disconnect length changed signal
     disconnect(viewer_node_, &ViewerOutput::LengthChanged, this, &TimeBasedWidget::UpdateMaximumScroll);
+    disconnect(viewer_node_, &ViewerOutput::RemovedFromGraph, this, &TimeBasedWidget::ConnectedNodeRemovedFromGraph);
 
     // Disconnect rate change signals if they were connected
     disconnect(viewer_node_, &ViewerOutput::FrameRateChanged, this, &TimeBasedWidget::AutoUpdateTimebase);
@@ -109,6 +110,7 @@ void TimeBasedWidget::ConnectViewerNode(ViewerOutput *node)
   if (viewer_node_) {
     // Connect length changed signal
     connect(viewer_node_, &ViewerOutput::LengthChanged, this, &TimeBasedWidget::UpdateMaximumScroll);
+    connect(viewer_node_, &ViewerOutput::RemovedFromGraph, this, &TimeBasedWidget::ConnectedNodeRemovedFromGraph);
 
     // Connect ruler and scrollbar to timeline points
     ruler()->ConnectTimelinePoints(viewer_node_->GetTimelinePoints());
@@ -216,6 +218,11 @@ void TimeBasedWidget::AutoUpdateTimebase()
   }
 }
 
+void TimeBasedWidget::ConnectedNodeRemovedFromGraph()
+{
+  ConnectViewerNode(nullptr);
+}
+
 TimeRuler *TimeBasedWidget::ruler() const
 {
   return ruler_;
@@ -281,29 +288,27 @@ void TimeBasedWidget::PassWheelEventsToScrollBar(QObject *object)
 
 void TimeBasedWidget::SetTimestamp(int64_t timestamp)
 {
-  if (GetTime() != timestamp) {
-    if (UserIsDraggingPlayhead()) {
-      // If the user is dragging the playhead, we will simply nudge over and not use autoscroll rules.
-      QMetaObject::invokeMethod(this, "CatchUpScrollToPlayhead", Qt::QueuedConnection);
-    } else {
-      // Otherwise, assume we jumped to this out of nowhere and must now autoscroll
-      switch (static_cast<AutoScroll::Method>(Config::Current()["Autoscroll"].toInt())) {
-      case AutoScroll::kNone:
-        // Do nothing
-        break;
-      case AutoScroll::kPage:
-        QMetaObject::invokeMethod(this, "PageScrollToPlayhead", Qt::QueuedConnection);
-        break;
-      case AutoScroll::kSmooth:
-        QMetaObject::invokeMethod(this, "CenterScrollOnPlayhead", Qt::QueuedConnection);
-        break;
-      }
+  if (UserIsDraggingPlayhead()) {
+    // If the user is dragging the playhead, we will simply nudge over and not use autoscroll rules.
+    QMetaObject::invokeMethod(this, "CatchUpScrollToPlayhead", Qt::QueuedConnection);
+  } else {
+    // Otherwise, assume we jumped to this out of nowhere and must now autoscroll
+    switch (static_cast<AutoScroll::Method>(Config::Current()["Autoscroll"].toInt())) {
+    case AutoScroll::kNone:
+      // Do nothing
+      break;
+    case AutoScroll::kPage:
+      QMetaObject::invokeMethod(this, "PageScrollToPlayhead", Qt::QueuedConnection);
+      break;
+    case AutoScroll::kSmooth:
+      QMetaObject::invokeMethod(this, "CenterScrollOnPlayhead", Qt::QueuedConnection);
+      break;
     }
-
-    ruler_->SetTime(timestamp);
-
-    TimeChangedEvent(timestamp);
   }
+
+  ruler_->SetTime(timestamp);
+
+  TimeChangedEvent(timestamp);
 }
 
 void TimeBasedWidget::SetTimebase(const rational &timebase)

app/widget/timebased/timebasedwidget.h

@@ -230,6 +230,8 @@ private slots:
 
   void AutoUpdateTimebase();
 
+  void ConnectedNodeRemovedFromGraph();
+
 };
 
 }

app/widget/timelinewidget/timelinewidget.cpp

@@ -50,8 +50,10 @@
 
 namespace olive {
 
+#define super TimeBasedWidget
+
 TimelineWidget::TimelineWidget(QWidget *parent) :
-  TimeBasedWidget(true, true, parent),
+  super(true, true, parent),
   rubberband_(QRubberBand::Rectangle, this),
   active_tool_(nullptr),
   use_audio_time_units_(false)
@@ -111,8 +113,6 @@ TimelineWidget::TimelineWidget(QWidget *parent) :
   connect(views_.first()->view()->horizontalScrollBar(), &QScrollBar::rangeChanged, scrollbar(), &QScrollBar::setRange);
   vert_layout->addWidget(scrollbar());
 
-  connect(ruler(), &TimeRuler::TimeChanged, this, &TimelineWidget::SetViewTimestamp);
-
   foreach (TimelineAndTrackView* tview, views_) {
     TimelineView* view = tview->view();
 
@@ -187,7 +187,7 @@ void TimelineWidget::Clear()
 
 void TimelineWidget::TimebaseChangedEvent(const rational &timebase)
 {
-  TimeBasedWidget::TimebaseChangedEvent(timebase);
+  super::TimebaseChangedEvent(timebase);
 
   timecode_label_->SetTimebase(timebase);
 
@@ -198,7 +198,7 @@ void TimelineWidget::TimebaseChangedEvent(const rational &timebase)
 
 void TimelineWidget::resizeEvent(QResizeEvent *event)
 {
-  TimeBasedWidget::resizeEvent(event);
+  super::resizeEvent(event);
 
   // Update timecode label size
   UpdateTimecodeWidthFromSplitters(views_.first()->splitter());
@@ -206,6 +206,8 @@ void TimelineWidget::resizeEvent(QResizeEvent *event)
 
 void TimelineWidget::TimeChangedEvent(const int64_t& timestamp)
 {
+  super::TimeChangedEvent(timestamp);
+
   SetViewTimestamp(timestamp);
 
   timecode_label_->SetValue(timestamp);
@@ -213,7 +215,7 @@ void TimelineWidget::TimeChangedEvent(const int64_t& timestamp)
 
 void TimelineWidget::ScaleChangedEvent(const double &scale)
 {
-  TimeBasedWidget::ScaleChangedEvent(scale);
+  super::ScaleChangedEvent(scale);
 
   foreach (TimelineAndTrackView* view, views_) {
     view->view()->SetScale(scale);

app/widget/timeruler/seekablewidget.cpp

@@ -180,9 +180,11 @@ void SeekableWidget::SeekToScreenPoint(int screen)
     }
   }
 
-  SetTime(timestamp);
+  if (timestamp != GetTime()) {
+    SetTime(timestamp);
 
-  emit TimeChanged(timestamp);
+    emit TimeChanged(timestamp);
+  }
 }
 
 void SeekableWidget::DrawTimelinePoints(QPainter* p, int marker_bottom)

app/widget/videoparamedit/videoparamedit.cpp

@@ -99,6 +99,8 @@ VideoParamEdit::VideoParamEdit(QWidget* parent) :
 
   // FIXME: Replace with rational slider
   frame_rate_slider_ = new FloatSlider();
+  frame_rate_slider_->SetMinimum(0);
+  frame_rate_slider_->SetDecimalPlaces(2);
   connect(frame_rate_slider_, &FloatSlider::ValueChanged, this, &VideoParamEdit::Changed);
   layout->addWidget(frame_rate_slider_, row, 1);
 
@@ -211,6 +213,8 @@ VideoParamEdit::VideoParamEdit(QWidget* parent) :
 
 void VideoParamEdit::SetParameterMask(uint64_t mask)
 {
+  mask_ = mask;
+
   width_lbl_->setVisible(mask & kWidthHeight);
   width_slider_->setVisible(mask & kWidthHeight);
   height_lbl_->setVisible(mask & kWidthHeight);
@@ -220,7 +224,7 @@ void VideoParamEdit::SetParameterMask(uint64_t mask)
   depth_slider_->setVisible(mask & kDepth);
 
   frame_rate_lbl_->setVisible(mask & kFrameRate);
-  frame_rate_combobox_->setVisible((mask & kFrameRate) && (mask & ~kFrameRateIsArbitrary));
+  frame_rate_combobox_->setVisible((mask & kFrameRate) && !(mask & kFrameRateIsArbitrary));
   frame_rate_slider_->setVisible((mask & kFrameRate) && (mask & kFrameRateIsArbitrary));
 
   pixel_aspect_lbl_->setVisible(mask & kPixelAspect);

app/widget/viewer/audiowaveformview.cpp

@@ -30,21 +30,38 @@
 
 namespace olive {
 
+#define super SeekableWidget
+
 AudioWaveformView::AudioWaveformView(QWidget *parent) :
-  SeekableWidget(parent),
+  super(parent),
   playback_(nullptr)
 {
   setAutoFillBackground(true);
   setBackgroundRole(QPalette::Base);
+}
 
-  cached_waveform_.resize(QThread::idealThreadCount());
+AudioVisualWaveform GenerateWaveform(QIODevice* device, AudioParams params, TimeRange range)
+{
+  device->open(QFile::ReadOnly);
+  device->seek(params.time_to_bytes(range.in()));
+
+  SampleBufferPtr samples = SampleBuffer::CreateFromPackedData(params, device->read(params.time_to_bytes(range.length())));
+  AudioVisualWaveform waveform;
+  waveform.set_channel_count(params.channel_count());
+  waveform.OverwriteSamples(samples, params.sample_rate());
+  device->close();
+  delete device;
+  return waveform;
 }
 
 void AudioWaveformView::SetViewer(AudioPlaybackCache *playback)
 {
   if (playback_) {
-    disconnect(playback_, &AudioPlaybackCache::Validated, this, &AudioWaveformView::ForceUpdateOfRange);
-    disconnect(playback_, &AudioPlaybackCache::ParametersChanged, this, &AudioWaveformView::BackendParamsChanged);
+    pool_.clear();
+    pool_.waitForDone();
+
+    disconnect(playback_, &AudioPlaybackCache::Validated, this, &AudioWaveformView::RenderRange);
+    //disconnect(playback_, &AudioPlaybackCache::ParametersChanged, this, &AudioWaveformView::RenderRange);
 
     SetTimebase(0);
   }
@@ -52,18 +69,20 @@ void AudioWaveformView::SetViewer(AudioPlaybackCache *playback)
   playback_ = playback;
 
   if (playback_) {
-    connect(playback_, &AudioPlaybackCache::Validated, this, &AudioWaveformView::ForceUpdateOfRange);
-    connect(playback_, &AudioPlaybackCache::ParametersChanged, this, &AudioWaveformView::BackendParamsChanged);
+    connect(playback_, &AudioPlaybackCache::Validated, this, &AudioWaveformView::RenderRange);
+    //connect(playback_, &AudioPlaybackCache::ParametersChanged, this, &AudioWaveformView::RenderRange);
 
     SetTimebase(playback_->GetParameters().sample_rate_as_time_base());
-  }
 
-  ForceUpdate();
+    waveform_.set_channel_count(playback_->GetParameters().channel_count());
+
+    RenderRange(TimeRange(0, playback_->GetLength()));
+  }
 }
 
 void AudioWaveformView::paintEvent(QPaintEvent *event)
 {
-  QWidget::paintEvent(event);
+  super::paintEvent(event);
 
   if (!playback_) {
     return;
@@ -80,40 +99,9 @@ void AudioWaveformView::paintEvent(QPaintEvent *event)
   // Draw in/out points
   DrawTimelinePoints(&p);
 
-  CachedWaveformInfo wanted_info = {size(), GetScale(), GetScroll(), params};
-
-  for (int i=0; i<cached_waveform_.size(); i++) {
-    ActiveCache& cache = cached_waveform_[i];
-
-    int slice_start = width()/cached_waveform_.size() * i;
-
-    if (cache.info == wanted_info) {
-
-      // Draw pixmap
-      p.drawPixmap(slice_start, 0, cache.pixmap);
-
-    } else if (cache.caching_info != wanted_info) {
-
-      int slice_end = width()/cached_waveform_.size() * (i+1);
-
-      // Pixmap is obsolete, will need to draw again
-
-      // Delete any existing watcher so we don't receive the signal
-      delete cache.watcher;
-
-      // Queue a new background cache operation
-      cache.caching_info = wanted_info;
-      cache.watcher = new QFutureWatcher<QPixmap>();
-      connect(cache.watcher, &QFutureWatcher<QPixmap>::finished, this, &AudioWaveformView::BackgroundCacheFinished);
-      cache.watcher->setFuture(QtConcurrent::run(this,
-                                                 &AudioWaveformView::DrawWaveform,
-                                                 playback_->CreatePlaybackDevice(),
-                                                 wanted_info,
-                                                 slice_start,
-                                                 slice_end));
-
-    }
-  }
+  // Draw waveform
+  p.setPen(QColor(64, 255, 160)); // FIXME: Hardcoded color
+  AudioVisualWaveform::DrawWaveform(&p, rect(), GetScale(), waveform_, SceneToTime(GetScroll()));
 
   // Draw playhead
   p.setPen(PLAYHEAD_COLOR);
@@ -122,117 +110,38 @@ void AudioWaveformView::paintEvent(QPaintEvent *event)
   p.drawLine(playhead_x, 0, playhead_x, height());
 }
 
-QPixmap AudioWaveformView::DrawWaveform(QIODevice* fs, CachedWaveformInfo info, int slice_start, int slice_end) const
+void AudioWaveformView::RenderRange(const TimeRange &range)
 {
-  QPixmap pixmap(slice_end - slice_start, info.size.height());
-  pixmap.fill(Qt::transparent);
+  // Floor to second increments
+  int64_t start = qFloor(range.in().toDouble());
+  int64_t end = qCeil(range.out().toDouble());
 
-  if (fs->open(QFile::ReadOnly)) {
+  for (; start!=end; start++) {
+    TimeRange this_range(start, start+1);
 
-    QPainter wave_painter(&pixmap);
+    QFutureWatcher<AudioVisualWaveform>* watcher = new QFutureWatcher<AudioVisualWaveform>();
+    connect(watcher, &QFutureWatcher<AudioVisualWaveform>::finished, this, &AudioWaveformView::BackgroundFinished);
 
-    // FIXME: Hardcoded color
-    wave_painter.setPen(QColor(64, 255, 160));
-
-    int drew = 0;
-
-    fs->seek(info.params.samples_to_bytes(ScreenToUnitRounded(slice_start)));
-
-    for (int x=slice_start; x<slice_end && !fs->atEnd(); x++) {
-      int samples_len = ScreenToUnitRounded(x+1) - ScreenToUnitRounded(x);
-      int max_read_size = info.params.samples_to_bytes(samples_len);
-
-      QByteArray read_buffer = fs->read(max_read_size);
-
-      // Detect whether we've reached EOF and recalculate sample count if so
-      if (read_buffer.size() < max_read_size) {
-        samples_len = info.params.bytes_to_samples(read_buffer.size());
-      }
-
-      QVector<AudioVisualWaveform::SamplePerChannel> samples = AudioVisualWaveform::SumSamples(reinterpret_cast<const float*>(read_buffer.constData()),
-                                                                                               samples_len,
-                                                                                               info.params.channel_count());
-
-      for (int i=0;i<info.params.channel_count();i++) {
-        AudioVisualWaveform::DrawSample(&wave_painter, samples, x - slice_start, 0, info.size.height());
-
-        drew++;
-      }
-    }
-
-    fs->close();
+    jobs_.insert(this_range, watcher);
 
+    watcher->setFuture(QtConcurrent::run(&pool_, GenerateWaveform, playback_->CreatePlaybackDevice(), playback_->GetParameters(), this_range));
   }
-
-  delete fs;
-
-  return pixmap;
 }
 
-void AudioWaveformView::BackendParamsChanged()
+void AudioWaveformView::BackgroundFinished()
 {
-  SetTimebase(playback_->GetParameters().sample_rate_as_time_base());
-}
+  QFutureWatcher<AudioVisualWaveform>* watcher = static_cast<QFutureWatcher<AudioVisualWaveform>*>(sender());
 
-void AudioWaveformView::ForceUpdate()
-{
-  // Forces the cache to invalidate
-  for (int i=0; i<cached_waveform_.size(); i++) {
-    cached_waveform_[i].info.size = QSize();
-  }
-
-  update();
-}
-
-void AudioWaveformView::ForceUpdateOfRange(const TimeRange &range)
-{
-  int in = TimeToScreen(range.in());
-  int out = TimeToScreen(range.out());
-
-  // Don't need to redraw anything
-  if (out < 0 || in >= width()) {
-    return;
-  }
-
-  int start_invalidate = qMax(0, in/cached_waveform_.size());
-  int end_invalidate = qMin(cached_waveform_.size()-1, out/cached_waveform_.size());
-
-  for (int i=start_invalidate; i<=end_invalidate; i++) {
-    // Invalidate these
-    cached_waveform_[i].info.size = QSize();
-  }
-
-  update();
-}
-
-void AudioWaveformView::BackgroundCacheFinished()
-{
-  // Retrieve sender
-  QFutureWatcher<QPixmap>* watcher = static_cast<QFutureWatcher<QPixmap>*>(sender());
-
-  // Determine index
-  int index = -1;
-  for (int i=0; i<cached_waveform_.size(); i++) {
-    if (cached_waveform_.at(i).watcher == watcher) {
-      index = i;
+  for (auto it=jobs_.begin(); it!=jobs_.end(); it++) {
+    if (it.value() == watcher) {
+      AudioVisualWaveform rendered = watcher->result();
+      waveform_.OverwriteSums(rendered, it.key().in());
+      jobs_.erase(it);
+      update();
       break;
     }
   }
 
-  if (index > -1) {
-    // Store generated pixmap
-    cached_waveform_[index].info = cached_waveform_[index].caching_info;
-    cached_waveform_[index].pixmap = watcher->result();
-    cached_waveform_[index].watcher = nullptr;
-
-    // Reset size
-    cached_waveform_[index].caching_info.size = QSize();
-
-    // Update with new pixmap
-    update();
-  }
-
-  // Clean up
   delete watcher;
 }
 

app/widget/viewer/audiowaveformview.h

@@ -41,51 +41,27 @@ public:
 
   void SetViewer(AudioPlaybackCache *playback);
 
+  const AudioVisualWaveform* waveform() const
+  {
+    return &waveform_;
+  }
+
 protected:
   virtual void paintEvent(QPaintEvent* event) override;
 
 private:
-  struct CachedWaveformInfo {
-    QSize size;
-    double scale;
-    int scroll;
-    AudioParams params;
+  void RenderRange(const TimeRange& range);
 
-    bool operator==(const CachedWaveformInfo& rhs) const
-    {
-      return size == rhs.size
-          && qFuzzyCompare(scale, rhs.scale)
-          && scroll == rhs.scroll
-          && params == rhs.params;
-    }
-
-    bool operator!=(const CachedWaveformInfo& rhs) const
-    {
-      return !(*this == rhs);
-    }
-  };
-
-  struct ActiveCache {
-    QPixmap pixmap;
-    CachedWaveformInfo info;
-    CachedWaveformInfo caching_info;
-    QFutureWatcher<QPixmap>* watcher = nullptr;
-  };
-
-  QPixmap DrawWaveform(QIODevice *fs, CachedWaveformInfo info, int slice_start, int slice_end) const;
+  QThreadPool pool_;
 
   AudioPlaybackCache *playback_;
 
-  QVector<ActiveCache> cached_waveform_;
+  AudioVisualWaveform waveform_;
+
+  QHash<TimeRange, QFutureWatcher<AudioVisualWaveform>*> jobs_;
 
 private slots:
-  void BackendParamsChanged();
-
-  void ForceUpdate();
-
-  void ForceUpdateOfRange(const TimeRange& range);
-
-  void BackgroundCacheFinished();
+  void BackgroundFinished();
 
 };
 

app/widget/viewer/viewer.cpp

@@ -72,6 +72,7 @@ ViewerWidget::ViewerWidget(QWidget *parent) :
 
   display_widget_ = new ViewerDisplayWidget();
   display_widget_->setAcceptDrops(true);
+  display_widget_->SetShowWidgetBackground(true);
   connect(display_widget_, &ViewerDisplayWidget::customContextMenuRequested, this, &ViewerWidget::ShowContextMenu);
   connect(display_widget_, &ViewerDisplayWidget::CursorColor, this, &ViewerWidget::CursorColor);
   connect(display_widget_, &ViewerDisplayWidget::ColorProcessorChanged, this, &ViewerWidget::ColorProcessorChanged);
@@ -109,6 +110,11 @@ ViewerWidget::ViewerWidget(QWidget *parent) :
   connect(controls_, &PlaybackControls::TimeChanged, this, &ViewerWidget::SetTimeAndSignal);
   layout->addWidget(controls_);
 
+  // If audio is invalidated during playback, we wait some time before starting it again
+  audio_restart_timer_.setInterval(250);
+  audio_restart_timer_.setSingleShot(true);
+  connect(&audio_restart_timer_, &QTimer::timeout, this, &ViewerWidget::StartAudioOutput);
+
   // FIXME: Magic number
   SetScale(48.0);
 
@@ -185,6 +191,8 @@ void ViewerWidget::ConnectNodeEvent(ViewerOutput *n)
   connect(n, &ViewerOutput::AudioParamsChanged, this, &ViewerWidget::UpdateRendererAudioParameters);
   connect(n->video_frame_cache(), &FrameHashCache::Invalidated, this, &ViewerWidget::ViewerInvalidatedVideoRange);
   connect(n->video_frame_cache(), &FrameHashCache::Shifted, this, &ViewerWidget::ViewerShiftedRange);
+  connect(n->audio_playback_cache(), &AudioPlaybackCache::Invalidated, this, &ViewerWidget::AudioCacheInvalidated);
+  connect(n->audio_playback_cache(), &AudioPlaybackCache::Validated, this, &ViewerWidget::AudioCacheValidated);
   connect(n, &ViewerOutput::TextureInputChanged, this, &ViewerWidget::UpdateStack);
 
   VideoParams vp = n->GetVideoParams();
@@ -229,6 +237,8 @@ void ViewerWidget::DisconnectNodeEvent(ViewerOutput *n)
   disconnect(n, &ViewerOutput::AudioParamsChanged, this, &ViewerWidget::UpdateRendererAudioParameters);
   disconnect(n->video_frame_cache(), &FrameHashCache::Invalidated, this, &ViewerWidget::ViewerInvalidatedVideoRange);
   disconnect(n->video_frame_cache(), &FrameHashCache::Shifted, this, &ViewerWidget::ViewerShiftedRange);
+  disconnect(n->audio_playback_cache(), &AudioPlaybackCache::Invalidated, this, &ViewerWidget::AudioCacheInvalidated);
+  disconnect(n->audio_playback_cache(), &AudioPlaybackCache::Validated, this, &ViewerWidget::AudioCacheValidated);
   disconnect(n, &ViewerOutput::TextureInputChanged, this, &ViewerWidget::UpdateStack);
 
   ruler()->SetPlaybackCache(nullptr);
@@ -390,13 +400,27 @@ void ViewerWidget::DecodeCachedImage(RenderTicketPtr ticket, const QString &fn,
 bool ViewerWidget::ShouldForceWaveform() const
 {
   return GetConnectedNode()
-      && !GetConnectedNode()->IsInputConnected(ViewerOutput::kTextureInput)
-      && GetConnectedNode()->IsInputConnected(ViewerOutput::kSamplesInput);
+      && !GetConnectedNode()->GetConnectedTextureOutput().IsValid()
+      && GetConnectedNode()->GetConnectedSampleOutput().IsValid();
+}
+
+void ViewerWidget::StartAudioOutput()
+{
+  AudioPlaybackCache* audio_cache = GetConnectedNode()->audio_playback_cache();
+  if (audio_cache->GetParameters().is_valid()) {
+    AudioManager::instance()->SetOutputParams(audio_cache->GetParameters());
+    AudioManager::instance()->StartOutput(audio_cache,
+                                          audio_cache->GetParameters().time_to_bytes(GetTime()),
+                                          playback_speed_);
+    emit AudioManager::instance()->OutputWaveformStarted(waveform_view_->waveform(),
+                                                         GetTime(), playback_speed_);
+  }
 }
 
 void ViewerWidget::UpdateTextureFromNode(const rational& time)
 {
   bool frame_exists_at_time = FrameExistsAtTime(time);
+  bool frame_might_be_still = GetConnectedNode() && GetConnectedNode()->GetConnectedTextureOutput().IsValid() && GetConnectedNode()->GetVideoLength().isNull();
 
   // Check playback queue for a frame
   if (IsPlaying()) {
@@ -433,24 +457,24 @@ void ViewerWidget::UpdateTextureFromNode(const rational& time)
     }
 
     // Only show warning if frame actually exists
-    if (frame_exists_at_time) {
+    if (frame_exists_at_time && !frame_might_be_still) {
       qWarning() << "Playback queue failed to keep up";
     }
 
   }
 
-  if (!frame_exists_at_time) {
+  if (frame_exists_at_time || frame_might_be_still) {
+    // Frame was not in queue, will require rendering or decoding from cache
+    RenderTicketWatcher* watcher = new RenderTicketWatcher();
+    connect(watcher, &RenderTicketWatcher::Finished, this, &ViewerWidget::RendererGeneratedFrame);
+    nonqueue_watchers_.append(watcher);
+    watcher->SetTicket(GetFrame(time, true));
+  } else {
     // There is definitely no frame here, we can immediately flip to showing nothing
     nonqueue_watchers_.clear();
     SetDisplayImage(nullptr, false);
     return;
   }
-
-  // Frame was not in queue, will require rendering or decoding from cache
-  RenderTicketWatcher* watcher = new RenderTicketWatcher();
-  connect(watcher, &RenderTicketWatcher::Finished, this, &ViewerWidget::RendererGeneratedFrame);
-  nonqueue_watchers_.append(watcher);
-  watcher->SetTicket(GetFrame(time, true));
 }
 
 void ViewerWidget::PlayInternal(int speed, bool in_to_out_only)
@@ -527,6 +551,7 @@ void ViewerWidget::PauseInternal()
 
     playback_queue_.clear();
     playback_backup_timer_.stop();
+    audio_restart_timer_.stop();
   }
 
   prequeuing_ = false;
@@ -593,9 +618,7 @@ QString ViewerWidget::GetCachedFilenameFromTime(const rational &time)
 
 bool ViewerWidget::FrameExistsAtTime(const rational &time)
 {
-  return GetConnectedNode()
-      && ((time >= 0 && time < GetConnectedNode()->video_frame_cache()->GetLength())
-          || GetConnectedNode()->video_frame_cache()->GetLength().isNull());
+  return GetConnectedNode() && time >= 0 && time < GetConnectedNode()->GetVideoLength();
 }
 
 void ViewerWidget::SetDisplayImage(FramePtr frame, bool main_only)
@@ -650,13 +673,7 @@ void ViewerWidget::FinishPlayPreprocess()
 {
   int64_t playback_start_time = ruler()->GetTime();
 
-  AudioPlaybackCache* audio_cache = GetConnectedNode()->audio_playback_cache();
-  if (audio_cache->GetParameters().is_valid()) {
-    AudioManager::instance()->SetOutputParams(audio_cache->GetParameters());
-    AudioManager::instance()->StartOutput(audio_cache,
-                                          audio_cache->GetParameters().time_to_bytes(GetTime()),
-                                          playback_speed_);
-  }
+  StartAudioOutput();
 
   playback_timer_.Start(playback_start_time, playback_speed_, timebase_dbl());
   display_widget_->ResetFPSTimer();
@@ -1263,4 +1280,21 @@ void ViewerWidget::Dropped(QDropEvent *event)
   }
 }
 
+void ViewerWidget::AudioCacheInvalidated()
+{
+  if (IsPlaying()) {
+    AudioManager::instance()->StopOutput();
+  }
+}
+
+void ViewerWidget::AudioCacheValidated()
+{
+  if (IsPlaying()) {
+    // This timer will restart audio
+    AudioManager::instance()->StopOutput();
+    audio_restart_timer_.stop();
+    audio_restart_timer_.start();
+  }
+}
+
 }

app/widget/viewer/viewer.h

@@ -245,6 +245,8 @@ private:
 
   PreviewAutoCacher auto_cacher_;
 
+  QTimer audio_restart_timer_;
+
   static QVector<ViewerWidget*> instances_;
 
 private slots:
@@ -292,6 +294,11 @@ private slots:
 
   void Dropped(QDropEvent* event);
 
+  void AudioCacheInvalidated();
+  void AudioCacheValidated();
+
+  void StartAudioOutput();
+
 };
 
 }

app/widget/viewer/viewerdisplay.cpp

@@ -49,7 +49,8 @@ ViewerDisplayWidget::ViewerDisplayWidget(QWidget *parent) :
   hand_dragging_(false),
   deinterlace_(false),
   show_fps_(false),
-  frames_skipped_(0)
+  frames_skipped_(0),
+  show_widget_background_(false)
 {
   connect(Core::instance(), &Core::ToolChanged, this, &ViewerDisplayWidget::UpdateCursor);
 
@@ -301,7 +302,7 @@ void ViewerDisplayWidget::dropEvent(QDropEvent *event)
 void ViewerDisplayWidget::OnPaint()
 {
   // Clear background to empty
-  QColor bg_color = palette().window().color();
+  QColor bg_color = show_widget_background_ ? palette().window().color() : Qt::black;
   renderer()->ClearDestination(bg_color.redF(), bg_color.greenF(), bg_color.blueF());
 
   // We only draw if we have a pipeline

app/widget/viewer/viewerdisplay.h

@@ -71,6 +71,12 @@ public:
   void SetVideoParams(const VideoParams &params);
   void SetTime(const rational& time);
 
+  void SetShowWidgetBackground(bool e)
+  {
+    show_widget_background_ = e;
+    update();
+  }
+
   FramePtr last_loaded_buffer() const;
 
   /**
@@ -288,6 +294,8 @@ private:
   QVector<double> frame_rate_averages_;
   int frame_rate_average_count_;
 
+  bool show_widget_background_;
+
 private slots:
   void EmitColorAtCursor(QMouseEvent* e);
 

app/window/mainwindow/mainstatusbar.cpp

@@ -71,7 +71,7 @@ void MainStatusBar::UpdateStatus()
     if (manager_->GetTaskCount() == 1) {
       showMessage(t->GetTitle());
     } else {
-      showMessage(tr("Running %1 background task(s)").arg(manager_->GetTaskCount()));
+      showMessage(tr("Running %n background task(s)", nullptr, manager_->GetTaskCount()));
     }
 
     bar_->setVisible(true);

app/window/mainwindow/mainwindow.cpp

@@ -261,6 +261,27 @@ ScopePanel *MainWindow::AppendScopePanel()
   return AppendFloatingPanelInternal<ScopePanel>(scope_panels_);
 }
 
+void MainWindow::OpenNodeInViewer(ViewerOutput *node)
+{
+  if (viewer_panels_.contains(node)) {
+    // This node already has a viewer, raise it
+    viewer_panels_.value(node)->raise();
+  } else {
+    // Create a viewer for this node
+    ViewerPanel* viewer = PanelManager::instance()->CreatePanel<ViewerPanel>(this);
+
+    viewer->SetSignalInsteadOfClose(true);
+    viewer->setFloating(true);
+    viewer->setVisible(true);
+    viewer->ConnectViewerNode(node);
+
+    connect(viewer, &ViewerPanel::CloseRequested, this, &MainWindow::ViewerCloseRequested);
+    connect(node, &ViewerOutput::RemovedFromGraph, this, &MainWindow::ViewerWithPanelRemovedFromGraph);
+
+    viewer_panels_.insert(node, viewer);
+  }
+}
+
 void MainWindow::SetFullscreen(bool fullscreen)
 {
   if (fullscreen) {
@@ -481,6 +502,22 @@ void MainWindow::ProjectCloseRequested()
   Core::instance()->CloseProject(p, true);
 }
 
+void MainWindow::ViewerCloseRequested()
+{
+  ViewerPanel* panel = static_cast<ViewerPanel*>(sender());
+
+  viewer_panels_.remove(viewer_panels_.key(panel));
+
+  panel->deleteLater();
+}
+
+void MainWindow::ViewerWithPanelRemovedFromGraph()
+{
+  ViewerOutput* vo = static_cast<ViewerOutput*>(sender());
+  viewer_panels_.take(vo)->deleteLater();
+  disconnect(vo, &ViewerOutput::RemovedFromGraph, this, &MainWindow::ViewerWithPanelRemovedFromGraph);
+}
+
 void MainWindow::FloatingPanelCloseRequested()
 {
   PanelWidget* panel = static_cast<PanelWidget*>(sender());

app/window/mainwindow/mainwindow.h

@@ -71,6 +71,8 @@ public:
 
   ScopePanel* AppendScopePanel();
 
+  void OpenNodeInViewer(ViewerOutput* node);
+
   enum ProgressStatus {
     kProgressNone,
     kProgressShow,
@@ -155,6 +157,7 @@ private:
   PixelSamplerPanel* pixel_sampler_panel_;
   QList<ScopePanel*> scope_panels_;
   NodeTablePanel* table_panel_;
+  QMap<ViewerOutput*, ViewerPanel*> viewer_panels_;
 
 #ifdef Q_OS_WINDOWS
   unsigned int taskbar_btn_id_;
@@ -173,6 +176,10 @@ private slots:
 
   void ProjectCloseRequested();
 
+  void ViewerCloseRequested();
+
+  void ViewerWithPanelRemovedFromGraph();
+
   void FloatingPanelCloseRequested();
 
   void StatusBarDoubleClicked();