Get rid of big stack allocation during resampler (re-)configuration.

2 files changed, 8 insertions, 5 deletions

diff --git a/src/drumgizmo.cc b/src/drumgizmo.cc
index ca91c12..345e89d 100644
--- a/src/drumgizmo.cc
+++ b/src/drumgizmo.cc
@@ -463,10 +463,13 @@ void DrumGizmo::setSamplerate(float samplerate, float resampling_quality)
 		zita[c].set_inp_data(nullptr);
 		zita[c].set_inp_count(null_size);
 
-		constexpr auto sz = 4096 * 16;
-		sample_t s[sz];
-		zita[c].set_out_data(s);
-		zita[c].set_out_count(sz);
+		auto scratch_buffer_size = (null_size / ratio) + 1;
+		if(scratch_buffer.size() < scratch_buffer_size)
+		{
+			scratch_buffer.resize(scratch_buffer_size);
+		}
+		zita[c].set_out_data(scratch_buffer.data());
+		zita[c].set_out_count(scratch_buffer_size);
 
 		zita[c].process();
 	}
diff --git a/src/drumgizmo.h b/src/drumgizmo.h
index f08c9f7..89c2960 100644
--- a/src/drumgizmo.h
+++ b/src/drumgizmo.h
@@ -107,5 +107,5 @@ protected:
 	std::array<ZRWrapper, NUM_CHANNELS> zita;
 	std::array<std::unique_ptr<sample_t>, NUM_CHANNELS> resampler_input_buffer;
 	double ratio = 1.0;
-
+	std::vector<sample_t> scratch_buffer;
 };