timeline/renderer: implemented basic waveform display support

2020-03-06 16:18:07 +11:00
parent a41c0e65ac
commit c75a0e8498
13 changed files with 230 additions and 14 deletions
@@ -0,0 +1,64 @@
+#include "sumsamples.h"
+
+#include <QDebug>
+
+const int SampleSummer::kSumSampleRate = 200;
+
+QVector<SampleSummer::Sum> SampleSummer::SumSamples(const float *samples, int nb_samples, int nb_channels)
+{
+  return SumSamplesInternal<float>(samples, nb_samples, nb_channels);
+}
+
+QVector<SampleSummer::Sum> SampleSummer::SumSamples(const qfloat16 *samples, int nb_samples, int nb_channels)
+{
+  return SumSamplesInternal<qfloat16>(samples, nb_samples, nb_channels);
+}
+
+QVector<SampleSummer::Sum> SampleSummer::ReSumSamples(const SampleSummer::Sum *samples, int nb_samples, int nb_channels)
+{
+  QVector<SampleSummer::Sum> summed_samples(nb_channels);
+
+  for (int i=0;i<nb_samples;i++) {
+    int channel = i%nb_channels;
+
+    const SampleSummer::Sum& sample = samples[i];
+
+    if (sample.min < summed_samples[channel].min) {
+      summed_samples[channel].min = sample.min;
+    }
+
+    if (sample.max > summed_samples[channel].max) {
+      summed_samples[channel].max = sample.max;
+    }
+  }
+
+  return summed_samples;
+}
+
+SampleSummer::Sum::Sum()
+{
+  min = 0;
+  max = 0;
+}
+
+template<typename T>
+QVector<SampleSummer::Sum> SampleSummer::SumSamplesInternal(const T *samples, int nb_samples, int nb_channels)
+{
+  QVector<SampleSummer::Sum> summed_samples(nb_channels);
+
+  for (int i=0;i<nb_samples;i++) {
+    int channel = i%nb_channels;
+
+    float sample = samples[i];
+
+    if (sample < summed_samples[channel].min) {
+      summed_samples[channel].min = sample;
+    }
+
+    if (sample > summed_samples[channel].max) {
+      summed_samples[channel].max = sample;
+    }
+  }
+
+  return summed_samples;
+}