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cef8a55b55
Original commit message from CVS: * gst/extend/jukebox.py: * gst/extend/sources.py: Fixes for thread-safety, changes in behaviour with gst.Pad and cleanup. Still has some issues.
356 lines
11 KiB
Python
356 lines
11 KiB
Python
#!/usr/bin/env python
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# -*- Mode: Python -*-
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# vi:si:et:sw=4:sts=4:ts=4
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#
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# GStreamer python bindings
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# Copyright (C) 2005 Edward Hervey <edward at fluendo dot com>
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# Copyright (C) 2005 Thomas Vander Stichele <thomas at apestaart dot org>
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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import os
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import sys
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import pickle
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import random as rand
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import gobject
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gobject.threads_init()
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import pygst
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pygst.require('0.10')
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import gst
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import utils
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from pygobject import gsignal
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import sources
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from leveller import Leveller
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class Jukebox(gst.Bin):
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gsignal('done', str)
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gsignal('prerolled') # emitted when at least 2 sources are ready
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gsignal('changed', str, gobject.TYPE_UINT64) # clocktime, filename
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gsignal('looped')
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def __init__(self, files, rms=0.2, loops=0, random=False,
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caps="audio/x-raw-int,channels=2,rate=44100",
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picklepath='level.pck'):
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# with pygtk 2.4 this call is needed for the gsignal to work
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self.__gobject_init__()
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self._target_rms = rms
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self._loopsleft = loops
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self._loopsdone = 0
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self._random = random
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self._picklepath = picklepath
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self._caps = gst.caps_from_string(caps)
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self._files = files[:] # copy
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self._levels = {} # filename -> rms, mixin, mixout, length
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self._prerolled = False
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self._playing = False
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self._scani = 0 # index into self._files for scanning
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self._playi = 0 # index into self._files for playing
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self._lastadded = None # last file added to composition
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self._lastposition = long(0) # last position where file was added
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if not len(files) > 1:
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raise TypeError, 'Must have at least 2 files'
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self._composition = gst.element_factory_make("gnlcomposition")
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self._composition.connect('pad-added', self._composition_pad_added_cb)
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self.add(self._composition)
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self._srcpad = None
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# load our pickle if it exists
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if os.path.exists(self._picklepath):
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file = open(self._picklepath)
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self._levels = pickle.load(file)
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file.close()
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# randomize our list if asked for
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if self._random:
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self._files = rand.sample(self._files, len(self._files))
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## public API
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def preroll(self):
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# scan the first few files and start playing
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gst.debug("starting jukebox prerolling")
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self._scan()
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def start(self):
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##
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## FIXME : THIS SHOULD'T BE NEEDED !
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## USE STATE CHANGES INSTEAD
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##
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if not self._prerolled:
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raise Exception, "baby"
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self.set_state(gst.STATE_PAUSED)
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## Scanning private methods
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def _scan(self):
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# start a leveller for a new _toscan file
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if self._scani >= len(self._files):
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gst.debug("We're done scanning !")
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return
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file = self._files[self._scani]
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self._scani += 1
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if file in self._levels.keys():
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gst.debug("already did file %s" % file)
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self._check_prerolled()
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gobject.timeout_add(0, self._scan)
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return
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gst.debug("creating leveller for %s" % file)
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leveller = Leveller(file)
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leveller.connect('done', self._leveller_done_cb, file)
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gobject.timeout_add(0, leveller.start)
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##gobject.idle_add(leveller.iterate)
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def _leveller_done_cb(self, l, reason, file):
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if reason != sources.EOS:
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gst.debug("Error: %s" % reason)
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return
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gst.debug("in: %s, out: %s" % (gst.TIME_ARGS(l.mixin),
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gst.TIME_ARGS(l.mixout)))
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gst.debug("rms: %f, %f dB" % (l.rms, l.rmsdB))
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# store infos
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self._levels[file] = (l.rms, l.mixin, l.mixout, l.length)
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gst.debug("writing level pickle")
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file = open(self._picklepath, "w")
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pickle.dump(self._levels, file)
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file.close()
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self._check_prerolled()
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self._scan()
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# clean up leveller after this handler
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gobject.timeout_add(0, l.clean)
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## GnlSource-related methods
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def _new_gnl_source(self, location, start):
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"""
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Creates a new GnlSource containing an AudioSource with the following
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properties correctly set:
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_ volume level
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_ priority
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_ duration
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The start position MUST be given
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"""
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if not self._levels[location]:
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return None
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self.debug("Creating new GnlSource at %s for %s" % (gst.TIME_ARGS(start), location))
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idx = self._files.index(location) + self._loopsdone * len(self._files)
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rms, mixin, mixout, duration = self._levels[location]
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gnls = gst.element_factory_make("gnlsource", "source-%d-%s" % (idx, location))
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src = sources.AudioSource(location)
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gnls.add(src)
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# set volume
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level = 1.0
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if rms > self._target_rms:
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level = self._target_rms / rms
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gst.debug('setting volume of %f' % level)
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else:
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gst.debug('not going to go above 1.0 level')
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src.set_volume(level)
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# set proper position/duration/priority in composition
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gnls.props.priority = (2 * self._loopsdone) + 1 + (idx % 2)
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gnls.props.start = long(start)
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gnls.props.duration = long(duration)
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gnls.props.media_duration = long(duration)
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gnls.props.media_start = long(0)
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return gnls
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def _new_mixer(self, start, duration):
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gnlo = gst.element_factory_make("gnloperation")
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ad = gst.element_factory_make("adder")
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gnlo.add(ad)
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gnlo.props.sinks = 2
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gnlo.props.start = start
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gnlo.props.duration = duration
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gnlo.props.priority = 0
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return gnlo
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def _append_file(self, location):
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"""
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Appends the given file to the composition, along with the proper mixer effect
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"""
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self.debug("location:%s" % location)
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start = self._lastposition
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if self._lastadded:
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start += self._levels[self._lastadded][2]
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start -= self._levels[location][1]
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gnls = self._new_gnl_source(location, start)
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self._composition.add(gnls)
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if self._lastadded:
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# create the mixer
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duration = self._levels[self._lastadded][3] - self._levels[self._lastadded][2] + self._levels[location][1]
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mixer = self._new_mixer(start, duration)
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self._composition.add(mixer)
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self._lastposition = start
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self._lastadded = location
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self.debug("lastposition:%s , lastadded:%s" % (gst.TIME_ARGS(self._lastposition),
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self._lastadded))
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def _check_prerolled(self):
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gst.debug("_check_prerolled: index: scan %d, play %d" % (
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self._scani, self._playi))
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if not self._prerolled and self._scani > self._playi + 1:
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self._prerolled = True
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# add initial sources here
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self._append_file(self._files[0])
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self._append_file(self._files[1])
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self.debug("now prerolled and ready to play")
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self.emit('prerolled')
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def _emit_changed(self, file, when):
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print "emitting changed for %s at %r" % (file, when)
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self.emit('changed', file, when)
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def _source_clean(self, source):
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source.set_state(gst.STATE_NULL)
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self.remove(source)
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source.clean()
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## composition callbacks
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def _composition_pad_added_cb(self, comp, pad):
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if self._srcpad:
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return
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self.debug("Ghosting source pad %s" % pad)
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self._srcpad = gst.GhostPad("src", pad)
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self._srcpad.set_active(True)
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self.add_pad(self._srcpad)
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## gst.Bin/Element virtual methods
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def do_handle_message(self, message):
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self.debug("got message %s / %s / %r" % (message.src.get_name(), message.type.first_value_name, message))
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# chaining up
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gst.Bin.do_handle_message(self, message)
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def do_state_change(self, transition):
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if not self._prerolled:
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gst.error("Call Jukebox.preroll() before!")
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return gst.STATE_CHANGE_FAILURE
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# chaining up
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return gst.Bin.do_state_change(self, message)
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gobject.type_register(Jukebox)
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# helper functions
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def _find_elements_recurse(element):
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if not isinstance(element, gst.Bin):
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return [element, ]
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l = []
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for e in element.elements():
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l.extend(_find_elements_recurse(e))
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return l
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def _find_unconnected_pad(bin, direction):
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for e in _find_elements_recurse(bin):
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for p in e.pads():
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if p.get_direction() == direction and not p.get_peer():
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return p
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return None
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# run us to test
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if __name__ == "__main__":
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main = gobject.MainLoop()
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pipeline = gst.Pipeline('jukebox')
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list = open(sys.argv[1]).read().rstrip().split('\n')
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print list
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#source = Jukebox(list, random=True, loops=-1)
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source = Jukebox(list, random=True, loops=1)
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def _jukebox_prerolled_cb(jukebox):
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print "prerolled"
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_start()
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def _jukebox_changed_cb(jukebox, filename, when):
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print "changed file to %s at %s" % (filename, float(when) / gst.TIME_ARGS(gst.SECOND))
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def _jukebox_looped_cb(jukebox):
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print "jukebox looped"
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def _start():
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source.start()
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print "setting pipeline to PLAYING"
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pipeline.set_state(gst.STATE_PLAYING)
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print "set pipeline to PLAYING"
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def jukebox_pad_added(comp, pad, sinkpad):
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pad.link(sinkpad)
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def jukebox_message(bus, message):
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if message.type == gst.MESSAGE_ERROR:
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print "Error: %s" % message.parse_error()
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main.quit()
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elif message.type == gst.MESSAGE_EOS:
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print "done"
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main.quit()
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source.connect('prerolled', _jukebox_prerolled_cb)
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source.connect('changed', _jukebox_changed_cb)
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source.connect('looped', _jukebox_looped_cb)
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source.preroll()
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pipeline.add(source)
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bus = pipeline.get_bus()
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bus.add_signal_watch()
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bus.connect("message", jukebox_message)
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p = "alsasink"
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if len(sys.argv) > 2:
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p = " ".join(sys.argv[2:])
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print "parsing output pipeline %s" % p
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sinkbin = gst.parse_launch("bin.( %s )" % p)
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pipeline.add(sinkbin)
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apad = _find_unconnected_pad(sinkbin, gst.PAD_SINK)
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if not apad:
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raise TypeError, "No unconnected sink pad found in bin %r" % sinkbin
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sinkpad = gst.GhostPad("sink", apad)
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sinkbin.add_pad(sinkpad)
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source.connect('pad-added', jukebox_pad_added, sinkpad)
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print "Going into main loop"
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sys.stdout.flush()
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main.run()
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print "Left main loop"
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sys.stdout.flush()
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pipeline.set_state(gst.STATE_NULL)
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