#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Copyright (C) 2007-2014 Parisson SARL
# Copyright (c) 2006-2014 Guillaume Pellerin <pellerin@parisson.com>
# Copyright (c) 2010-2014 Paul Brossier <piem@piem.org>
# Copyright (c) 2013-2014 Thomas Fillon <thomas@parisson.com>
# This file is part of TimeSide.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 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 Affero General Public License for more details.
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from timeside.core import Processor, implements, interfacedoc, abstract
from timeside.core.api import IEncoder
from .tools.gstutils import numpy_array_to_gst_buffer, MainloopThread
import pygst
pygst.require('0.10')
import gst
import gobject
gobject.threads_init()
import threading
# Streaming queue configuration
QUEUE_SIZE = 10
GST_APPSINK_MAX_BUFFERS = 10
[docs]class GstEncoder(Processor):
implements(IEncoder)
abstract()
type = 'encoder'
def __init__(self, output, streaming=False, overwrite=False):
super(GstEncoder, self).__init__()
if isinstance(output, basestring):
import os.path
if os.path.isdir(output):
raise IOError("Encoder output must be a file, not a directory")
elif os.path.isfile(output) and not overwrite:
raise IOError(
"Encoder output %s exists, but overwrite set to False")
self.filename = output
else:
self.filename = None
self.streaming = streaming
if not self.filename and not self.streaming:
raise Exception('Must give an output')
self.end_cond = threading.Condition(threading.Lock())
self.eod = False
self.metadata = None
self.num_samples = 0
self._chunk_len = 0
[docs] @interfacedoc
def release(self):
if hasattr(self, 'eod') and hasattr(self, 'mainloopthread'):
self.end_cond.acquire()
while not hasattr(self, 'end_reached'):
self.end_cond.wait()
self.end_cond.release()
if hasattr(self, 'error_msg'):
raise IOError(self.error_msg)
def __del__(self):
self.release()
[docs] def start_pipeline(self, channels, samplerate):
self.pipeline = gst.parse_launch(self.pipe)
# store a pointer to appsrc in our encoder object
self.src = self.pipeline.get_by_name('src')
if self.streaming:
import Queue
self._streaming_queue = Queue.Queue(QUEUE_SIZE)
# store a pointer to appsink in our encoder object
self.app = self.pipeline.get_by_name('app')
self.app.set_property('max-buffers', GST_APPSINK_MAX_BUFFERS)
self.app.set_property("drop", False)
self.app.set_property('emit-signals', True)
self.app.connect("new-buffer", self._on_new_buffer_streaming)
#self.app.connect('new-preroll', self._on_new_preroll_streaming)
srccaps = gst.Caps("""audio/x-raw-float,
endianness=(int)1234,
channels=(int)%s,
width=(int)32,
rate=(int)%d""" % (int(channels), int(samplerate)))
self.src.set_property("caps", srccaps)
self.src.set_property('emit-signals', True)
self.src.set_property('num-buffers', -1)
self.src.set_property('block', False)
self.src.set_property('do-timestamp', True)
self.bus = self.pipeline.get_bus()
self.bus.add_signal_watch()
self.bus.connect("message", self._on_message_cb)
self.mainloop = gobject.MainLoop()
self.mainloopthread = MainloopThread(self.mainloop)
self.mainloopthread.start()
# start pipeline
self.pipeline.set_state(gst.STATE_PLAYING)
def _on_message_cb(self, bus, message):
t = message.type
if t == gst.MESSAGE_EOS:
self.end_cond.acquire()
if self.streaming:
self._streaming_queue.put(gst.MESSAGE_EOS)
self.pipeline.set_state(gst.STATE_NULL)
self.mainloop.quit()
self.end_reached = True
self.end_cond.notify()
self.end_cond.release()
elif t == gst.MESSAGE_ERROR:
self.end_cond.acquire()
self.pipeline.set_state(gst.STATE_NULL)
self.mainloop.quit()
self.end_reached = True
err, debug = message.parse_error()
self.error_msg = "Error: %s" % err, debug
self.end_cond.notify()
self.end_cond.release()
def _on_new_buffer_streaming(self, appsink):
# print 'pull-buffer'
chunk = appsink.emit('pull-buffer')
self._streaming_queue.put(chunk)
def _on_new_preroll_streaming(self, appsink):
# print 'preroll'
chunk = appsink.emit('pull-preroll')
self._streaming_queue.put(chunk)
[docs] @interfacedoc
def process(self, frames, eod=False):
self.eod = eod
if eod:
self.num_samples += frames.shape[0]
else:
self.num_samples += self.blocksize()
buf = numpy_array_to_gst_buffer(frames, frames.shape[0],
self.num_samples, self.samplerate())
self.src.emit('push-buffer', buf)
if self.eod:
self.src.emit('end-of-stream')
return frames, eod
[docs] def get_stream_chunk(self):
if self.streaming:
chunk = self._streaming_queue.get(block=True)
if chunk == gst.MESSAGE_EOS:
return None
else:
self._streaming_queue.task_done()
return chunk
else:
raise TypeError('function only available in streaming mode')
if __name__ == "__main__":
import doctest
doctest.testmod()