ref: 0b9a02a653bc4e9d33b82eb5369ce6a94a637eed
dir: /interfaces/python/aubioinput.py/
#! /usr/bin/python import pygst pygst.require('0.10') import gst import gobject gobject.threads_init () def gst_buffer_to_numpy_array(buffer, chan): import numpy samples = numpy.frombuffer(buffer.data, dtype=numpy.float32) samples.resize([len(samples)/chan, chan]) return samples.T class AubioSink(gst.BaseSink): _caps = gst.caps_from_string('audio/x-raw-float, \ rate=[ 1, 2147483647 ], \ channels=[ 1, 2147483647 ], \ endianness={ 1234, 4321 }, \ width=32') __gsttemplates__ = ( gst.PadTemplate ("sink", gst.PAD_SINK, gst.PAD_ALWAYS, _caps), ) def __init__(self, name, process): self.__gobject_init__() self.set_name(name) self.process = process self.adapter = gst.Adapter() self.set_property('sync', False) self.pos = 0 def set_property(self, name, value): if name == 'hopsize': # blocksize is in byte, convert from hopsize from struct import calcsize self.set_property('blocksize', value * calcsize('f')) else: super(gst.BaseSink, self).set_property(name, value) def do_render(self, buffer): blocksize = self.get_property('blocksize') caps = buffer.get_caps() chan = caps[0]['channels'] self.adapter.push(buffer) while self.adapter.available() >= blocksize: block = self.adapter.take_buffer(blocksize) v = gst_buffer_to_numpy_array(block, chan) if self.process: self.process(v, self.pos) self.pos += 1 return gst.FLOW_OK gobject.type_register(AubioSink) class aubioinput(gst.Bin): ret = 0 def __init__(self, uri, process = None, hopsize = 512, caps = None): if uri.startswith('/'): from urllib import quote uri = 'file://'+quote(uri) src = gst.element_factory_make('uridecodebin') src.set_property('uri', uri) src.connect('pad-added', self.source_pad_added_cb) conv = gst.element_factory_make('audioconvert') self.conv = conv rsmpl = gst.element_factory_make('audioresample') capsfilter = gst.element_factory_make('capsfilter') if caps: capsfilter.set_property('caps', gst.caps_from_string(caps)) sink = AubioSink("AubioSink", process = process) sink.set_property('hopsize', hopsize) # * calcsize('f')) self.pipeline = gst.Pipeline() self.bus = self.pipeline.get_bus() self.bus.add_signal_watch() self.bus.connect('message', self.on_eos) self.apad = conv.get_pad('sink') self.pipeline.add(src, conv, rsmpl, capsfilter, sink) gst.element_link_many(conv, rsmpl, capsfilter, sink) self.mainloop = gobject.MainLoop() self.pipeline.set_state(gst.STATE_PLAYING) def run(self): self.mainloop.run() return self.ret def source_pad_added_cb(self, src, pad): name = pad.get_caps()[0].get_name() if name == 'audio/x-raw-float' or name == 'audio/x-raw-int': pad.link(self.conv.get_pad("sink")) def source_pad_removed_cb(self, src, pad): pad.unlink(self.conv.get_pad("sink")) def on_eos(self, bus, msg): if msg.type == gst.MESSAGE_EOS: self.bus.remove_signal_watch() self.pipeline.set_state(gst.STATE_PAUSED) self.mainloop.quit() elif msg.type == gst.MESSAGE_ERROR: print "ERROR", msg.parse_error() self.bus.remove_signal_watch() self.pipeline.set_state(gst.STATE_PAUSED) self.mainloop.quit() self.ret = 1 # set return value to 1 in case of error if __name__ == '__main__': import sys if len(sys.argv) < 2: print "Usage: %s <filename>" % sys.argv[0] sys.exit(1) for filename in sys.argv[1:]: peak = [0.] # use a mutable def process(buf, hop): peak[0] = max( peak[0], abs(buf.max()) ) a = aubioinput(filename, process = process, hopsize = 512) if a.run() == 0: # only display the results if no print "Finished reading %s, peak value is %f" % (filename, max(peak))