/
Elements.py
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/
Elements.py
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#!/usr/bin/env python
import gobject
gobject.threads_init()
import gst
import Math, numpy
class Noise(gst.BaseSrc):
__gsttemplates__ = (
gst.PadTemplate("src",
gst.PAD_SRC,
gst.PAD_ALWAYS,
gst.Caps("audio/x-raw-spectrum"))
)
__gstdetails__ = ("spectrum_noise", "Audio/Source", "src for noise spectrum", "Leberwurscht")
def __init__(self):
self.__gobject_init__()
self.pad = self.get_pad("src")
self.pad.use_fixed_caps()
phase = numpy.random.random(2049)*2.*numpy.pi
self.spectrum = numpy.exp(phase*1j)
def do_create(self, offset, size):
b = gst.Buffer(self.spectrum)
b.set_caps(self.pad.get_caps())
return gst.FLOW_OK, b
gobject.type_register(Noise)
gst.element_register(Noise, "spectrum_noise")
class FFT(gst.Element):
_sinkpadtemplate = gst.PadTemplate ("sink",
gst.PAD_SINK,
gst.PAD_ALWAYS,
gst.Caps("audio/x-raw-float, rate=44100, channels=1, width=64, endianness=1234"))
_srcpadtemplate = gst.PadTemplate ("src",
gst.PAD_SRC,
gst.PAD_ALWAYS,
gst.Caps("audio/x-raw-spectrum"))
__gstdetails__ = ("fft", "Audio/Filter", "fft element", "Leberwurscht")
# __gproperties__ = {"":(gobject.TYPE_INT, "mode", "editing mode", 0, MODES_NUM-1, MODE_DEFAULT, gobject.PARAM_READWRITE)}
def __init__(self):
gst.Element.__init__(self)
self.sinkpad = gst.Pad(self._sinkpadtemplate, "sink")
self.sinkpad.use_fixed_caps()
self.srcpad = gst.Pad(self._srcpadtemplate, "src")
self.srcpad.use_fixed_caps()
self.sinkpad.set_chain_function(self.chainfunc)
self.sinkpad.set_event_function(self.eventfunc)
self.add_pad (self.sinkpad)
self.srcpad.set_event_function(self.srceventfunc)
self.add_pad (self.srcpad)
self.adapter = gst.Adapter()
def chainfunc(self, pad, buffer):
# fixme: need to reset adapter when starting - see gstspectrum.c
self.adapter.push(buffer)
end_time = buffer.timestamp + buffer.duration
gst.log("Got buffer with ts %d and length %d" % (buffer.timestamp, len(buffer)))
l = 4096
bytes_num = l*8
while self.adapter.available() >= bytes_num:
time_till_end = int( self.adapter.available()/8. / 44100 * gst.SECOND )
data = numpy.frombuffer(self.adapter.peek(bytes_num))
fft = numpy.fft.rfft(data) # length of this array is l/2 + 1
b = gst.Buffer(fft)
b.timestamp = end_time - time_till_end
b.set_caps(self.srcpad.get_caps())
self.srcpad.push(b)
self.adapter.flush(bytes_num)
return gst.FLOW_OK
def eventfunc(self, pad, event):
return self.srcpad.push_event(event)
def srceventfunc (self, pad, event):
return self.sinkpad.push_event(event)
gobject.type_register(FFT)
gst.element_register(FFT, "fft")
class IFFT(gst.Element):
_sinkpadtemplate = gst.PadTemplate ("sink",
gst.PAD_SINK,
gst.PAD_ALWAYS,
gst.Caps("audio/x-raw-spectrum"))
_srcpadtemplate = gst.PadTemplate ("src",
gst.PAD_SRC,
gst.PAD_ALWAYS,
gst.Caps("audio/x-raw-float, rate=44100, channels=1, width=64, endianness=1234"))
__gstdetails__ = ("ifft", "Audio/Filter", "inverse fft element", "Leberwurscht")
def __init__(self):
gst.Element.__init__(self)
self.sinkpad = gst.Pad(self._sinkpadtemplate, "sink")
self.sinkpad.use_fixed_caps()
self.srcpad = gst.Pad(self._srcpadtemplate, "src")
self.srcpad.use_fixed_caps()
self.sinkpad.set_chain_function(self.chainfunc)
self.sinkpad.set_event_function(self.eventfunc)
self.add_pad (self.sinkpad)
self.srcpad.set_event_function(self.srceventfunc)
self.add_pad (self.srcpad)
def chainfunc(self, pad, buffer):
gst.log ("Passing buffer with ts %d" % (buffer.timestamp))
fft = numpy.frombuffer(buffer, numpy.complex128)
l = 2*len(fft) - 2
data = numpy.fft.irfft(fft, l)
b = gst.Buffer(data)
b.set_caps(self.srcpad.get_caps())
b.timestamp = buffer.timestamp
return self.srcpad.push(b)
def eventfunc(self, pad, event):
return self.srcpad.push_event(event)
def srceventfunc (self, pad, event):
return self.sinkpad.push_event(event)
gobject.type_register(IFFT)
gst.element_register(IFFT, "ifft")
class Equalizer(gst.Element):
_sinkpadtemplate = gst.PadTemplate ("sink",
gst.PAD_SINK,
gst.PAD_ALWAYS,
gst.Caps("audio/x-raw-spectrum"))
_srcpadtemplate = gst.PadTemplate ("src",
gst.PAD_SRC,
gst.PAD_ALWAYS,
gst.Caps("audio/x-raw-spectrum"))
__gstdetails__ = ("spectrum_equalizer", "Audio/Filter", "equalizer that deals with spectrum data", "Leberwurscht")
__gproperties__ = {"transmission":(gobject.TYPE_PYOBJECT, "transmission", "transmission for each spectral band", gobject.PARAM_READWRITE)}
def __init__(self, *args, **kwargs):
self.frequencies = Math.get_frq(2049, 44100)
self.transmission = None
gst.Element.__init__(self, *args, **kwargs)
if not self.transmission:
self.transmission = numpy.ones(2049)
self.sinkpad = gst.Pad(self._sinkpadtemplate, "sink")
self.sinkpad.use_fixed_caps()
self.srcpad = gst.Pad(self._srcpadtemplate, "src")
self.srcpad.use_fixed_caps()
self.sinkpad.set_chain_function(self.chainfunc)
self.sinkpad.set_event_function(self.eventfunc)
self.add_pad (self.sinkpad)
self.srcpad.set_event_function(self.srceventfunc)
self.add_pad (self.srcpad)
# custom property
def do_get_property(self,pspec):
return getattr(self, pspec.name)
def do_set_property(self,pspec,value):
setattr(self, pspec.name, value)
def chainfunc(self, pad, buffer):
gst.log ("Passing buffer with ts %d" % (buffer.timestamp))
fft = numpy.frombuffer(buffer, numpy.complex128)
fft = fft * self.transmission
b = gst.Buffer(fft)
b.set_caps(self.srcpad.get_caps())
b.timestamp = buffer.timestamp
return self.srcpad.push(b)
def eventfunc(self, pad, event):
return self.srcpad.push_event(event)
def srceventfunc (self, pad, event):
return self.sinkpad.push_event(event)
gobject.type_register(Equalizer)
gst.element_register(Equalizer, "spectrum_equalizer")