DelayLine: Add function to retrieve the maximum possible delay time

modules/juce_dsp/processors/juce_DelayLine.cpp

@@ -49,7 +49,7 @@ DelayLine<SampleType, InterpolationType>::DelayLine (int maximumDelayInSamples)
 template <typename SampleType, typename InterpolationType>
 void DelayLine<SampleType, InterpolationType>::setDelay (SampleType newDelayInSamples)
 {
-    auto upperLimit = (SampleType) (totalSize - 1);
+    auto upperLimit = (SampleType) getMaximumDelayInSamples();
     jassert (isPositiveAndNotGreaterThan (newDelayInSamples, upperLimit));
 
     delay     = jlimit ((SampleType) 0, upperLimit, newDelayInSamples);

modules/juce_dsp/processors/juce_DelayLine.h

@@ -120,6 +120,13 @@ public:
     */
     void setMaximumDelayInSamples (int maxDelayInSamples);
 
+    /** Gets the maximum possible delay in samples.
+
+        For very short delay times, the result of getMaximumDelayInSamples() may
+        differ from the last value passed to setMaximumDelayInSamples().
+    */
+    int getMaximumDelayInSamples() const noexcept       { return totalSize - 1; }
+
     /** Resets the internal state variables of the processor. */
     void reset();