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"""Multi-format decoder using Gstreamer.
"""
import queue
import atexit
import weakref
import tempfile
from threading import Event, Thread
from pyglet.util import DecodeException
from .base import StreamingSource, AudioData, AudioFormat, StaticSource
from . import MediaEncoder, MediaDecoder
try:
import gi
gi.require_version('Gst', '1.0')
from gi.repository import Gst, GLib
except (ValueError, ImportError) as e:
raise ImportError(e)
class GStreamerDecodeException(DecodeException):
pass
class _GLibMainLoopThread(Thread):
"""A background Thread for a GLib MainLoop"""
def __init__(self):
super().__init__(daemon=True)
self.mainloop = GLib.MainLoop.new(None, False)
self.start()
def run(self):
self.mainloop.run()
class _MessageHandler:
"""Message Handler class for GStreamer Sources.
This separate class holds a weak reference to the
Source, preventing garbage collection issues.
"""
def __init__(self, source):
self.source = weakref.proxy(source)
def message(self, bus, message):
"""The main message callback"""
if message.type == Gst.MessageType.EOS:
self.source.queue.put(self.source.sentinal)
if not self.source.caps:
raise GStreamerDecodeException("Appears to be an unsupported file")
elif message.type == Gst.MessageType.ERROR:
raise GStreamerDecodeException(message.parse_error())
def notify_caps(self, pad, *args):
"""notify::caps callback"""
self.source.caps = True
info = pad.get_current_caps().get_structure(0)
self.source._duration = pad.get_peer().query_duration(Gst.Format.TIME).duration / Gst.SECOND
channels = info.get_int('channels')[1]
sample_rate = info.get_int('rate')[1]
sample_size = int("".join(filter(str.isdigit, info.get_string('format'))))
self.source.audio_format = AudioFormat(channels=channels, sample_size=sample_size, sample_rate=sample_rate)
# Allow GStreamerSource.__init__ to complete:
self.source.is_ready.set()
def pad_added(self, element, pad):
"""pad-added callback"""
name = pad.query_caps(None).to_string()
if name.startswith('audio/x-raw'):
nextpad = self.source.converter.get_static_pad('sink')
if not nextpad.is_linked():
self.source.pads = True
pad.link(nextpad)
def no_more_pads(self, element):
"""Finished Adding pads"""
if not self.source.pads:
raise GStreamerDecodeException('No Streams Found')
def new_sample(self, sink):
"""new-sample callback"""
# Pull the sample, and get its buffer:
buffer = sink.emit('pull-sample').get_buffer()
# Extract a copy of the memory in the buffer:
mem = buffer.extract_dup(0, buffer.get_size())
self.source.queue.put(mem)
return Gst.FlowReturn.OK
@staticmethod
def unknown_type(uridecodebin, decodebin, caps):
"""unknown-type callback for unreadable files"""
streaminfo = caps.to_string()
if not streaminfo.startswith('audio/'):
return
raise GStreamerDecodeException(streaminfo)
class GStreamerSource(StreamingSource):
source_instances = weakref.WeakSet()
sentinal = object()
def __init__(self, filename, file=None):
self._pipeline = Gst.Pipeline()
msg_handler = _MessageHandler(self)
if file:
file.seek(0)
self._file = tempfile.NamedTemporaryFile(buffering=False)
self._file.write(file.read())
filename = self._file.name
# Create the major parts of the pipeline:
self.filesrc = Gst.ElementFactory.make("filesrc", None)
self.decoder = Gst.ElementFactory.make("decodebin", None)
self.converter = Gst.ElementFactory.make("audioconvert", None)
self.appsink = Gst.ElementFactory.make("appsink", None)
if not all((self.filesrc, self.decoder, self.converter, self.appsink)):
raise GStreamerDecodeException("Could not initialize GStreamer.")
# Set callbacks for EOS and error messages:
self._pipeline.bus.add_signal_watch()
self._pipeline.bus.connect("message", msg_handler.message)
# Set the file path to load:
self.filesrc.set_property("location", filename)
# Set decoder callback handlers:
self.decoder.connect("pad-added", msg_handler.pad_added)
self.decoder.connect("no-more-pads", msg_handler.no_more_pads)
self.decoder.connect("unknown-type", msg_handler.unknown_type)
# Set the sink's capabilities and behavior:
self.appsink.set_property('caps', Gst.Caps.from_string('audio/x-raw,format=S16LE,layout=interleaved'))
self.appsink.set_property('drop', False)
self.appsink.set_property('sync', False)
self.appsink.set_property('max-buffers', 0) # unlimited
self.appsink.set_property('emit-signals', True)
# The callback to receive decoded data:
self.appsink.connect("new-sample", msg_handler.new_sample)
# Add all components to the pipeline:
self._pipeline.add(self.filesrc)
self._pipeline.add(self.decoder)
self._pipeline.add(self.converter)
self._pipeline.add(self.appsink)
# Link together necessary components:
self.filesrc.link(self.decoder)
self.decoder.link(self.converter)
self.converter.link(self.appsink)
# Callback to notify once the sink is ready:
self.caps_handler = self.appsink.get_static_pad("sink").connect("notify::caps", msg_handler.notify_caps)
# Set by callbacks:
self.pads = False
self.caps = False
self._pipeline.set_state(Gst.State.PLAYING)
self.queue = queue.Queue(5)
self._finished = Event()
# Wait until the is_ready event is set by a callback:
self.is_ready = Event()
if not self.is_ready.wait(timeout=1):
raise GStreamerDecodeException('Initialization Error')
GStreamerSource.source_instances.add(self)
def __del__(self):
self.delete()
def delete(self):
if hasattr(self, '_file'):
self._file.close()
try:
while not self.queue.empty():
self.queue.get_nowait()
sink = self.appsink.get_static_pad("sink")
if sink.handler_is_connected(self.caps_handler):
sink.disconnect(self.caps_handler)
self._pipeline.set_state(Gst.State.NULL)
self._pipeline.bus.remove_signal_watch()
self.filesrc.set_property("location", None)
except (ImportError, AttributeError):
pass
def get_audio_data(self, num_bytes, compensation_time=0.0):
if self._finished.is_set():
return None
data = bytes()
while len(data) < num_bytes:
packet = self.queue.get()
if packet == self.sentinal:
self._finished.set()
break
data += packet
if not data:
return None
timestamp = self._pipeline.query_position(Gst.Format.TIME).cur / Gst.SECOND
duration = self.audio_format.bytes_per_second / len(data)
return AudioData(data, len(data), timestamp, duration, [])
def seek(self, timestamp):
# First clear any data in the queue:
while not self.queue.empty():
self.queue.get_nowait()
self._pipeline.seek_simple(Gst.Format.TIME,
Gst.SeekFlags.FLUSH | Gst.SeekFlags.KEY_UNIT,
timestamp * Gst.SECOND)
self._finished.clear()
def _cleanup():
# At exist, ensure any remaining Source instances are cleaned up.
# If this is not done, GStreamer may hang due to dangling callbacks.
for src in GStreamerSource.source_instances:
src.delete()
atexit.register(_cleanup)
#########################################
# Decoder class:
#########################################
class GStreamerDecoder(MediaDecoder):
def __init__(self):
Gst.init(None)
self._glib_loop = _GLibMainLoopThread()
def get_file_extensions(self):
return '.mp3', '.flac', '.ogg', '.m4a'
def decode(self, filename, file, streaming=True):
if not any(filename.endswith(ext) for ext in self.get_file_extensions()):
# Refuse to decode anything not specifically listed in the supported
# file extensions list. This decoder does not yet support video, but
# it would still decode it and return only the Audio track. This is
# not desired, since the other decoders will not get a turn. Instead
# we bail out and let pyglet pass it to the next codec (FFmpeg).
raise GStreamerDecodeException('Unsupported format.')
if streaming:
return GStreamerSource(filename, file)
else:
return StaticSource(GStreamerSource(filename, file))
def get_decoders():
return [GStreamerDecoder()]
def get_encoders():
return []
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