Issue #316

pydub/scipy_effects.py

@@ -62,3 +62,54 @@ def high_pass_filter(seg, cutoff_freq, order=5):
 def low_pass_filter(seg, cutoff_freq, order=5):
     filter_fn = _mk_butter_filter(cutoff_freq, 'lowpass', order=order)
     return seg.apply_mono_filter_to_each_channel(filter_fn)
+
+
+@register_pydub_effect
+def eq(seg,focus_freq,bandwidth=100,mode="peak",gain_dB=0,order=2):
+    """
+    Args:
+        focus_freq - middle frequency or known frequency of band (in Hz)
+        bandwidth - range of the equalizer band
+        mode - Mode of Equalization(Peak/Notch(Bell Curve),High Shelf, Low Shelf)
+        order - Rolloff factor(1 - 6dB/Octave 2 - 12dB/Octave)
+
+    Returns:
+        Equalized/Filtered AudioSegment
+    """
+	if gain_dB>=0:
+		if mode=="peak":
+			sec=band_pass_filter(seg,focus_freq-bandwidth/2,focus_freq+bandwidth/2,order=order)
+			seg=seg.overlay(sec-(3-gain_dB))
+			return seg
+			pass
+		if mode=="low_shelf":
+			sec=low_pass_filter(seg,focus_freq,order=order)
+			seg=seg.overlay(sec-(3-gain_dB))
+			return seg
+			pass
+		if mode=="high_shelf":
+			sec=high_pass_filter(seg,focus_freq,order=order)
+			seg=seg.overlay(sec-(3-gain_dB))
+			return seg
+			pass
+		pass
+	if gain_dB<0:
+		if mode=="peak":
+			sec=high_pass_filter(seg,focus_freq-bandwidth/2,order=order)
+			seg=seg.overlay(sec-(3+gain_dB))+gain_dB
+			sec=low_pass_filter(seg,focus_freq+bandwidth/2,order=order)
+			seg=seg.overlay(sec-(3+gain_dB))+gain_dB
+			return seg
+			pass
+		if mode=="low_shelf":
+			sec=high_pass_filter(seg,focus_freq,order=order)
+			seg=seg.overlay(sec-(3+gain_dB))+gain_dB
+			return seg
+			pass
+		if mode=="high_shelf":
+			sec=low_pass_filter(seg,focus_freq,order=order)
+			seg=seg.overlay(sec-(3+gain_dB))+gain_dB
+			return seg
+			pass
+		pass
+	pass

pydub/utils.py

@@ -415,3 +415,20 @@ def get_supported_decoders():
 
 def get_supported_encoders():
     return get_supported_codecs()[1]
+
+def stereo_to_ms(audio_segment):
+	'''
+	Left-Right -> Mid-Side
+	'''
+	channel = audio_segment.split_to_mono()
+	channel = [channel[0].overlay(channel[1]),channel[0].overlay(channel[1].invert_phase())]
+	return AudioSegment.from_mono_audiosegments(channel[0],channel[1])
+	pass
+def ms_to_stereo(audio_segment):
+	'''
+	Mid-Side -> Left-Right
+	'''
+	channel = audio_segment.split_to_mono()
+	channel = [channel[0].overlay(channel[1])-3,channel[0].overlay(channel[1].invert_phase())-3]
+	return AudioSegment.from_mono_audiosegments(channel[0],channel[1])
+	pass