Originally Posted by ukaef

This is the latest code of my work, before I abandon it. Someone already done what I was trying to do, so it was waste of time. Anyway, if you want to play mp3`s the key is to use gst module.

Code:

#!/usr/bin/python

import pygst
pygst.require("0.10")
import gst
import os
import pygtk
import gtk
import audioop

class Main:
	def __init__(self):
		self.pipeline = gst.Pipeline("mypipeline")
		self.audiotestsrc = gst.element_factory_make("alsasrc")
		self.pipeline.add(self.audiotestsrc)
		self.sink = gst.element_factory_make("appsink", "sink")
                self.sink.set_property('caps', gst.Caps('audio/x-raw-int, width=16, depth=16, signed=true'))
                self.sink.set_property('drop', False)
                self.sink.set_property('max-buffers', 5)
                self.sink.set_property('sync', False)
                #self.sink.connect('new-buffer', self._new_buffer)
                self.pipeline.add(self.sink)
                print('starting...')
		self.audiotestsrc.link(self.sink)
		self.pipeline.set_state(gst.STATE_PLAYING)
                # tmp = 0
                for i in range(1, 999999):
                    #new = ord(self.sink.emit('pull-buffer')[0])
                    # if new > tmp:
                    #os.system('clear') 
                    pipa = abs(audioop.avg(self.sink.emit('pull-buffer'), 2))
                    print(pipa*'x')
        #def _new_buffer(self, sink):
                #buf = sink.emit('pull-buffer')
                #print(buf)
start=Main()
gtk.main()

you can run this, its safe It will print "x" marks on console - as many as the sound output level from the pipeline.

Basically programming music app in python for n900 is about good understanding gstreamer pipelines. You should find example pipelines on google, then use this code to build your own pipeline to play mp3. In my code, source of sound is

Code:

self.audiotestsrc = gst.element_factory_make("alsasrc")

but gst have sources which will play mp3s.

good luck!