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#
# OggConvert -- Converts media files to Free formats
# (c) 2007 Tristan Brindle <tcbrindle at gmail dot com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
import gobject
import pygst
pygst.require("0.10")
import gst
import ocv_constants
class Transcoder(gobject.GObject):
__gsignals__ = {
'paused' : (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, []),
'playing' : (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, []),
'eos' : (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, [])
}
def __init__(self, infile, outfile, vformat, vquality, aquality, fformat):
gobject.GObject.__init__(self)
self._infile = infile
self._outfile = outfile
self._vformat = vformat
if self._vformat == "THEORA":
self._vquality = ocv_constants.THEORA_QUALITY_MAPPING[vquality]
elif self._vformat == "SCHRO":
self._vquality = ocv_constants.SCHRO_QUALITY_MAPPING[vquality]
else:
# We should never get here
self._vquality = 0
self._aquality = ocv_constants.VORBIS_QUALITY_MAPPING[aquality]
self._fformat = fformat
self._pipeline = gst.Pipeline()
#self._filesrc = gst.element_factory_make("filesrc")
#self._filesrc.set_property("location", self._infile)
self._filesrc = gst.element_make_from_uri(gst.URI_SRC, infile)
self._decodebin = gst.element_factory_make("decodebin")
self._decodebin.connect("new-decoded-pad", self._on_new_pad)
if fformat == "OGG":
self._mux = gst.element_factory_make("oggmux")
for key in ocv_constants.OGGMUX_OPTS:
self._mux.set_property(key, ocv_constants.OGGMUX_OPTS[key])
else:
self._mux = gst.element_factory_make("matroskamux")
for key in ocv_constants.MATROSKAMUX_OPTS:
self._mux.set_property(key, ocv_constants.MATROSKAMUX_OPTS[key])
self._progreport = gst.element_factory_make("progressreport")
self._filesink = gst.element_factory_make("filesink")
self._filesink.set_property("location", outfile)
self._pipeline.add(self._filesrc,
self._decodebin,
self._mux,
self._progreport,
self._filesink)
# Link up what we've got so far
self._filesrc.link(self._decodebin)
self._mux.link(self._progreport)
self._progreport.link(self._filesink)
# Connect up callbacks
self.bus = self._pipeline.get_bus()
self.bus.add_signal_watch()
self.bus.connect("message::eos",self._on_end_of_stream)
self.bus.connect("message::state-changed", self._on_state_changed)
def play(self):
self._pipeline.set_state(gst.STATE_PLAYING)
def pause(self):
self._pipeline.set_state(gst.STATE_PAUSED)
def stop(self):
self.bus.remove_signal_watch()
self._pipeline.set_state(gst.STATE_NULL)
def sync(self):
"""
Wait for the pipeline to change state
We give it a 3 second timeout: returns True if the state change was
successful in this time, False otherwise
"""
state = self._pipeline.get_state(timeout=3*gst.SECOND)[0]
if state == gst.STATE_CHANGE_SUCCESS:
return True
else:
return False
def get_position(self):
try:
return self._pipeline.query_position(gst.FORMAT_TIME)[0]
except gst.QueryError:
return None
def get_duration(self):
try:
return self._pipeline.query_duration(gst.FORMAT_TIME)[0]
except gst.QueryError:
return None
def _on_new_pad(self, element, pad, args):
caps = pad.get_caps()
pad_type = caps.to_string()[0:5]
if pad_type == "video":
encoder = VideoEncoder(self._vformat, self._vquality)
self._pipeline.add(encoder)
encoder.set_state(gst.STATE_PAUSED)
pad.link(encoder.get_pad("sink"))
encoder.link(self._mux)
elif pad_type == "audio":
encoder = AudioEncoder(self._aquality)
self._pipeline.add(encoder)
encoder.set_state(gst.STATE_PAUSED)
pad.link(encoder.get_pad("sink"))
encoder.link(self._mux)
else:
print "Unknown pad type detected, %s" %pad_type
def _on_end_of_stream(self, bus, message):
self.emit('eos')
def _on_state_changed(self, bus, message):
if (message.src == self._pipeline):
state = message.parse_state_changed()
if state[1] == gst.STATE_PAUSED:
self.emit('paused')
elif state[1] == gst.STATE_PLAYING:
self.emit('playing')
class VideoEncoder(gst.Bin):
def __init__(self, format, quality):
gst.Bin.__init__(self)
self._queue1 = gst.element_factory_make("queue")
self._queue1.set_property("max-size-buffers",500)
self._queue2 = gst.element_factory_make("queue")
self._queue1.set_property("max-size-buffers",500)
self._ffmpegcsp = gst.element_factory_make("ffmpegcolorspace")
self._videorate = gst.element_factory_make("videorate")
if format == "SCHRO":
self.encoder = gst.element_factory_make("schroenc")
for prop in ocv_constants.SCHRO_OPTS:
self.encoder.set_property(prop, ocv_constants.SCHRO_OPTS[prop])
try:
self.encoder.set_property("noise-threshold", quality)
except TypeError:
print "This version of schroenc doesn't have the quality property"
else:
self.encoder = gst.element_factory_make("theoraenc")
for prop in ocv_constants.THEORA_OPTS:
self.encoder.set_property(prop, ocv_constants.THEORA_OPTS[prop])
self.encoder.set_property("quality", quality)
self.add(self._queue1,
self._ffmpegcsp,
self._videorate,
self.encoder,
self._queue2)
gst.element_link_many(self._queue1,
self._ffmpegcsp,
self._videorate,
self.encoder,
self._queue2)
# Create GhostPads
self.add_pad(gst.GhostPad('sink', self._queue1.get_pad('sink')))
self.add_pad(gst.GhostPad('src', self._queue2.get_pad('src')))
class AudioEncoder(gst.Bin):
def __init__(self, quality):
gst.Bin.__init__(self)
self._queue1 = gst.element_factory_make("queue")
self._queue1.set_property("max-size-buffers",500)
self._queue2 = gst.element_factory_make("queue")
self._queue2.set_property("max-size-buffers",500)
self._audioconvert = gst.element_factory_make("audioconvert")
# Vorbisenc can't handle packets without timestamps very well.
# This means that certain demuxers (asfdemux and matroskademux for
# example, but also most of the ffdemux elements) will generate
# very choppy audio.
#
# Fortunately GStreamer includes an audiorate element which can fix up
# such broken streams, by putting the right timestamps on and so forth.
# Unfortunately the audiorate element is broken in 0.10.10, to the extent
# that the pipeline won't even preroll. Therefore we check the GStreamer
# version (in __init__.py) to decide whether to use it or not. If you want
# to override this checking for any reason, you can do so by editing
# ocv_constants.py
if ocv_constants.USE_AUDIORATE:
self._audiorate = gst.element_factory_make("audiorate")
else:
self._audiorate = gst.element_factory_make("identity")
self.encoder = gst.element_factory_make("vorbisenc")
# Set Vorbis options
for prop in ocv_constants.VORBIS_OPTS:
self.encoder.set_property(prop, ocv_constants.VORBIS_OPTS[prop])
self.encoder.set_property("quality", quality)
self.add(self._queue1,
self._audioconvert,
self._audiorate,
self.encoder,
self._queue2)
gst.element_link_many(self._queue1,
self._audioconvert,
self._audiorate,
self.encoder,
self._queue2)
# Create GhostPads
self.add_pad(gst.GhostPad('sink', self._queue1.get_pad('sink')))
self.add_pad(gst.GhostPad('src', self._queue2.get_pad('src')))
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