Fix audio glitches in the DAB plugin #2226
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The glitches were generated by an int16 integer overflow. The issue appeared when the audio was near or at the saturation level. When the input audio signal is saturated, the polyphase filter based interpolation/decimation functions tend to increase the samples values and then make them pass the int16 limits. The int16 sample scale() parameter defeat the min/max limitation. This fix removes the intermediate int16 type conversion by using the Complex Real type. fixes f4exb#1978
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The glitches were generated by an int16 integer overflow.
The issue appeared when the audio was near or at the saturation level.
When the input audio signal is saturated, the polyphase filter based interpolation/decimation functions tend to increase the samples values and then make them pass the int16 limits. The int16 sample scale() parameter defeat the min/max limitation.
This fix removes the intermediate int16 type conversion by using the Complex Real type.
fixes #1978
Also : The audio signal is not decimated anymore if not needed.