def test_codec_ComplexLowPass():
filter = ComplexLowPass(FilterType.BUTTERWORTH, 2, 48000, 100)
output = json.dumps(filter.to_json())
assert output == '{"_type": "ComplexLowPass", "filter_type": "BW", "order": 2, "fs": 48000, "fc": 100.0}'
decoded = filter_from_json(json.loads(output))
assert decoded is not None
assert isinstance(decoded, ComplexLowPass)
assert filter.fs == decoded.fs
assert filter.type == decoded.type
assert filter.order == decoded.order
assert filter.freq == decoded.freq
assert decoded.get_transfer_function() is not None
def create_pass_filter(self):
'''
Creates a predefined high or low pass filter.
:return: the filter.
'''
if self.filterType.currentText() == 'Low Pass':
filt = ComplexLowPass(FilterType[self.passFilterType.currentText().upper().replace('-', '_')],
self.filterOrder.value(), self.__signal.fs, self.freq.value())
else:
filt = ComplexHighPass(FilterType[self.passFilterType.currentText().upper().replace('-', '_')],
self.filterOrder.value(), self.__signal.fs, self.freq.value())
filt.id = self.__selected_id
return filt
def __convert_to_ffmpeg_filter_complex(self,
audio_input,
c_name,
channel_idx,
sig,
low_pass_main_bm=False):
'''
Formats a channel to a ffmpeg filter chain.
:param audio_input:the ffmpeg input channel that contains the audio track.
:param c_name: the channel name we're processing (FL, FR etc)
:param channel_idx: the channel idx, 0 based.
:param sig: the signal containing the filter.
:return: a formatted filter string.
'''
f_idx = 0
# extract a single channel, convert it to dbl sample format
# pipe it through each biquad in the matching signal
# convert back to 32bit into the original fs and place in a named mono stream
# [0:a]pan=1c|c0=c<channel_num>[<c_name>];[L]aformat=sample_fmts=dbl[Lin];[Lin]biquad=b0=1.00080054343984:b1=-1.99150225042309:b2=0.990752403334702:a0=1.0:a1=-1.99150965346467:a2=0.991545543732965[L1];[L1]biquad=b0=0.999200096917323:b1=-1.98991663875369:b2=0.990752403395918:a0=1.0:a1=-1.98990924163382:a2=0.989959897433105[L2];[L2]aformat=sample_fmts=s32:sample_rates=48000:channel_layouts=mono[Lout];
if low_pass_main_bm:
c_name = f"BM{c_name}"
filt = f"{audio_input}pan=1c|c0=c{channel_idx}[{c_name}];"
filt += f"[{c_name}]aformat=sample_fmts=dbl[{c_name}_{f_idx}];"
if sig is not None:
sig_filter = sig.active_filter.resample(int(self.__sample_rate),
copy_listener=False)
for f in sig_filter.filters:
for bq in format_biquad(f):
filt += f"[{c_name}_{f_idx}]biquad={bq}[{c_name}_{f_idx + 1}];"
f_idx += 1
# apply BM high or low pass filter after the filters are applied
bmpf = None
if low_pass_main_bm:
bmpf = ComplexLowPass(FilterType.LINKWITZ_RILEY, 4,
int(self.__sample_rate), self.__bm_fs)
elif self.bass_manage is True and (self.lfe_idx - 1) != channel_idx:
bmpf = ComplexHighPass(FilterType.LINKWITZ_RILEY, 4,
int(self.__sample_rate), self.__bm_fs)
if bmpf:
for bq in format_biquad(bmpf):
filt += f"[{c_name}_{f_idx}]biquad={bq}[{c_name}_{f_idx + 1}];"
f_idx += 1
# add a passthrough filter if we have no other filters to add
if f_idx == 0:
filt += f"[{c_name}_{f_idx}]biquad={format_biquad(Passthrough())[0]}[{c_name}_{f_idx + 1}];"
f_idx += 1
# gain adjustment
if not math.isclose(self.filtered_audio_offset, 0.0):
filt += f"[{c_name}_{f_idx}]volume=volume={self.filtered_audio_offset:+g}dB[{c_name}_{f_idx + 1}];"
f_idx += 1
# enforce sample format
filt += f"[{c_name}_{f_idx}]aformat=sample_fmts=s32:sample_rates={self.__sample_rate}"
return filt
def filter_from_json(o):
'''
Converts a dict (parsed from json) to a filter.
:param o: the dict.
:return: the filter.
'''
from model.iir import Passthrough, PeakingEQ, LowShelf, HighShelf, FirstOrder_LowPass, \
FirstOrder_HighPass, SecondOrder_LowPass, SecondOrder_HighPass, AllPass, CompleteFilter, ComplexLowPass, \
FilterType, ComplexHighPass
filt = None
if '_type' not in o:
raise ValueError(f"{o} is not a filter")
if o['_type'] == Passthrough.__name__:
if 'fs' in o:
filt = Passthrough(fs=int(o['fs']))
else:
filt = Passthrough()
elif o['_type'] == Gain.__name__:
filt = Gain(o['fs'], o['gain'])
elif o['_type'] == PeakingEQ.__name__:
filt = PeakingEQ(o['fs'], o['fc'], o['q'], o['gain'])
elif o['_type'] == LowShelf.__name__:
filt = LowShelf(o['fs'], o['fc'], o['q'], o['gain'], o['count'])
elif o['_type'] == HighShelf.__name__:
filt = HighShelf(o['fs'], o['fc'], o['q'], o['gain'], o['count'])
elif o['_type'] == FirstOrder_LowPass.__name__:
filt = FirstOrder_LowPass(o['fs'], o['fc'], o['q'])
elif o['_type'] == FirstOrder_HighPass.__name__:
filt = FirstOrder_HighPass(o['fs'], o['fc'], o['q'])
elif o['_type'] == SecondOrder_LowPass.__name__:
filt = SecondOrder_LowPass(o['fs'], o['fc'], o['q'])
elif o['_type'] == SecondOrder_HighPass.__name__:
filt = SecondOrder_HighPass(o['fs'], o['fc'], o['q'])
elif o['_type'] == AllPass.__name__:
filt = AllPass(o['fs'], o['fc'], o['q'])
elif o['_type'] == CompleteFilter.__name__:
kwargs = {}
if 'fs' in o:
kwargs['fs'] = o['fs']
filt = CompleteFilter(
filters=[filter_from_json(x) for x in o['filters']],
description=o['description'],
**kwargs)
elif o['_type'] == ComplexLowPass.__name__:
filt = ComplexLowPass(FilterType(o['filter_type']), o['order'],
o['fs'], o['fc'])
elif o['_type'] == ComplexHighPass.__name__:
filt = ComplexHighPass(FilterType(o['filter_type']), o['order'],
o['fs'], o['fc'])
if filt is None:
raise ValueError(f"{o._type} is an unknown filter type")
else:
if filt.id == -1:
filt.id = uuid4()
return filt