├── spatify ├── __init__.py ├── __main__.py └── rtc.py ├── examples ├── https_server.py ├── localhost.crt ├── localhost.key └── websocket.html ├── setup.py ├── .gitignore ├── README.md └── LICENSE /spatify/__init__.py: -------------------------------------------------------------------------------- 1 | -------------------------------------------------------------------------------- /examples/https_server.py: -------------------------------------------------------------------------------- 1 | from http.server import HTTPServer, SimpleHTTPRequestHandler 2 | import ssl 3 | 4 | 5 | httpd = HTTPServer(('0.0.0.0', 4443), SimpleHTTPRequestHandler) 6 | 7 | httpd.socket = ssl.wrap_socket (httpd.socket, 8 | keyfile="localhost.key", 9 | certfile='localhost.crt', server_side=True) 10 | 11 | httpd.serve_forever() 12 | -------------------------------------------------------------------------------- /setup.py: -------------------------------------------------------------------------------- 1 | from setuptools import setup, find_namespace_packages 2 | 3 | with open("README.md", "r") as fh: 4 | long_description = fh.read() 5 | 6 | setup(name='spatify', 7 | version='0.1.0', 8 | author='Bruno Gola', 9 | author_email='me@bgo.la', 10 | description='Spatial audio over WebRTC', 11 | long_description=long_description, 12 | long_description_content_type="text/markdown", 13 | url="https://github.com/bgola/spatify", 14 | packages=find_namespace_packages(include=['spatify', 'spaitfy.*']), 15 | classifiers=[ 16 | "Programming Language :: Python :: 3", 17 | "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)", 18 | "Operating System :: OS Independent", 19 | "Framework :: AsyncIO", 20 | ], 21 | install_requires=['python-osc'], 22 | keywords='webrtc audio osc opensoundcontrol', 23 | python_requires='>=3.7', 24 | entry_points={ 25 | 'console_scripts': [ 26 | 'spatify = spatify.__main__:main' 27 | ] 28 | }, 29 | ) 30 | -------------------------------------------------------------------------------- /examples/localhost.crt: -------------------------------------------------------------------------------- 1 | -----BEGIN CERTIFICATE----- 2 | MIIC8DCCAdigAwIBAgIUYKpFxwyVkCoyQJv4jtrV2zaj46QwDQYJKoZIhvcNAQEL 3 | BQAwFDESMBAGA1UEAwwJbG9jYWxob3N0MB4XDTIwMTIyNjE5NDkxNloXDTIxMDEy 4 | NTE5NDkxNlowFDESMBAGA1UEAwwJbG9jYWxob3N0MIIBIjANBgkqhkiG9w0BAQEF 5 | AAOCAQ8AMIIBCgKCAQEAtK3bc41WgQZDZ/rZsH4hbye5di8FlsSVfGVL7K2uW/wD 6 | f1AbgkNrg1DgTv+iAqSj/j9mFF7Ig5PnBkBvXx1mKhgCHBNlUUwsy0U3/vi1mhc2 7 | NPUjGlFIis7DlerXDfC8WEBg/ZZCdLWlZR/xF87qRFfFex9k+VRn40au65o5yaDF 8 | mH0rfUr4bplKMVTilP5e9LwTEIgnTWe/nuEou9lg2YQ9kCzIGJdTFPHmfgxz3Y4R 9 | 1zUYOdpeJj9X3Ox8391ZwhBmDYjQZtXcdJNWYX/UcGdbjcmeaOhgEVyFoKLWXEqT 10 | JYv9k49DDmYQ0X/7p8xvTdp6LGCbA74PuWXSx+kZJQIDAQABozowODAUBgNVHREE 11 | DTALgglsb2NhbGhvc3QwCwYDVR0PBAQDAgeAMBMGA1UdJQQMMAoGCCsGAQUFBwMB 12 | MA0GCSqGSIb3DQEBCwUAA4IBAQCZw2+Dfmo/8PnzcxLM7mCwb6ifZMjE/UI/1dzx 13 | 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| ZdLH6RklAgMBAAECggEANpCKxcrZZP3PPYe0VmjBECCfEeIBfhbATmEJHOEW1xC0 9 | va4joKNbxLyYAUOSWdn+7LmYym4VgCcajfjHqaHnSK8XdAMnhfXLUVgGISpbLb30 10 | 0Ol3QGtrzP/EcXIKoFsjhkNrByppx3VUDcYnuVjzxs/7A8PnaqTi+vBNwzlAWnOA 11 | 3fnwSKuxwjwrfeXI628TmdKax2dvOAb+fkvNZTNsJD1F4KxE9GMt7rv+ow6SGVd1 12 | ij75FNt0eZQ1uKHW5j1vi3GqEU9llRyTTmzR9PJOB+DSHL7aiiuTf2ItjB1nasZy 13 | tPWnbXo5T72+q7UxtuRwKe7NqiqKDWZAYuqghYa2AQKBgQDp1CrZgUOLilm+vxGL 14 | OGQSG8b5vgB+TcDr7HMhfWuyrNqERmuqDIIbJIL+zw+8XFILejVL589xY94lGSkA 15 | ZUMD3r/hWLu8Hm3umhT2KJ4AkM4Q5VhT4tWz+Y25fLvvR+lBSmZHfWLUveNCKZOm 16 | CyHXXQ+FNj+PbbF47J/y64/+PQKBgQDFz5Btrq5NDDeAwvU7aEuruTakrcRrIHoK 17 | eI6TVmyg1JYjsCsBELzR4w9TuZPuqKOD9hXmI9VpEpCZdDI2N7OCRJEEJoCf6tXr 18 | Ok+Zhm8jNh6liqEAu2M09CN7CXo0/q2CwZWDIsa6wglYxx98J92elYpKHBopSNof 19 | EBjRX0FdCQKBgQCtKCUjNQpkB2w2SSAgzP2uO0u6He4XmlTHYS5RGqPqiP64/b01 20 | DFY862jmcUfh4SwQu8tEDsIb4izbpCos1NAvyYCmzCMaSB54lzn2oFWBbbpr4Krs 21 | VAqVYLSHK8uwgrxFUWc0gbHygTwN/uQMDipdZdjceTPQbxcByZkZN0BGsQKBgQCo 22 | bjuBWRqrGjrsVZSwN/cuyi8f+6Hiwa2I2uwzwoQOUdVhn/COIK1WXetAFCVFMqzA 23 | gTpWUq61oAwlzc2vYrBjvHRqP0qIYFIzz9vVUqWxKrTfqfG7iNNJVJQdgI1hMHWX 24 | f7QKDAOBJBUHVc2WTu+ix5wPzGvuOU0Y5ADtzhj+2QKBgQDFQnGkJE4+832yR3zi 25 | q/ifZM3A9TFkXyx7kx/gHZdHfvvfqdRMrvHuKahUDvAtpI07+l6SdbrAiI3EFr5a 26 | DoR+4rxc1tP555h6Np6jRNvMdtW3Qz6SAbtH4ldBlGCfrDUqBqY1vl3Ls7h+YKHV 27 | bff5Pu5S8iIbe1vz3VBcGF930Q== 28 | -----END PRIVATE KEY----- 29 | -------------------------------------------------------------------------------- /spatify/__main__.py: -------------------------------------------------------------------------------- 1 | import argparse 2 | import asyncio 3 | import ssl 4 | import websockets 5 | import logging 6 | 7 | from spatify.rtc import ws_handler 8 | 9 | logger = logging.getLogger(__name__) 10 | 11 | def main(): 12 | parser = argparse.ArgumentParser( 13 | description="Spatify server" 14 | ) 15 | parser.add_argument("--cert", help="SSL certificate path (for WSS)") 16 | parser.add_argument("--key", help="SSL key path (for WSS)") 17 | parser.add_argument( 18 | "--host", default="0.0.0.0", help="Host for WebSocket server (default: 0.0.0.0)" 19 | ) 20 | parser.add_argument( 21 | "--port", type=int, default=8765, help="Port for WebSocket server (default: 8765)" 22 | ) 23 | parser.add_argument("--verbose", "-v", action="count") 24 | parser.add_argument("--quiet", "-q", action="count") 25 | args = parser.parse_args() 26 | 27 | if args.verbose: 28 | log_level = logging.DEBUG 29 | elif args.quiet: 30 | log_level = logging.WARNING 31 | else: 32 | log_level = logging.INFO 33 | logging.basicConfig(level=log_level, format="%(asctime)s %(message)s") 34 | 35 | if args.cert: 36 | ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER) 37 | ssl_context.load_cert_chain(args.cert, args.key) 38 | else: 39 | ssl_context = None 40 | 41 | start_server = websockets.serve( 42 | ws_handler, args.host, args.port, ssl=ssl_context 43 | ) 44 | 45 | logger.info(f"Listening for websocket signaling on {args.host}:{args.port}") 46 | 47 | try: 48 | asyncio.get_event_loop().run_until_complete(start_server) 49 | asyncio.get_event_loop().run_forever() 50 | except KeyboardInterrupt: 51 | logger.info("Quitting.") 52 | 53 | 54 | if __name__ == "__main__": 55 | main() 56 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Byte-compiled / optimized / DLL files 2 | __pycache__/ 3 | *.py[cod] 4 | *$py.class 5 | 6 | # C extensions 7 | *.so 8 | 9 | # Distribution / packaging 10 | .Python 11 | build/ 12 | develop-eggs/ 13 | dist/ 14 | downloads/ 15 | eggs/ 16 | .eggs/ 17 | lib/ 18 | lib64/ 19 | parts/ 20 | sdist/ 21 | var/ 22 | wheels/ 23 | pip-wheel-metadata/ 24 | share/python-wheels/ 25 | *.egg-info/ 26 | .installed.cfg 27 | *.egg 28 | MANIFEST 29 | 30 | # PyInstaller 31 | # Usually these files are written by a python script from a template 32 | # before PyInstaller builds the exe, so as to inject date/other infos into it. 33 | *.manifest 34 | *.spec 35 | 36 | # Installer logs 37 | pip-log.txt 38 | pip-delete-this-directory.txt 39 | 40 | # Unit test / coverage reports 41 | htmlcov/ 42 | .tox/ 43 | .nox/ 44 | .coverage 45 | .coverage.* 46 | .cache 47 | nosetests.xml 48 | coverage.xml 49 | *.cover 50 | *.py,cover 51 | .hypothesis/ 52 | .pytest_cache/ 53 | 54 | # Translations 55 | *.mo 56 | *.pot 57 | 58 | # Django stuff: 59 | *.log 60 | local_settings.py 61 | db.sqlite3 62 | db.sqlite3-journal 63 | 64 | # Flask stuff: 65 | instance/ 66 | .webassets-cache 67 | 68 | # Scrapy stuff: 69 | .scrapy 70 | 71 | # Sphinx documentation 72 | docs/_build/ 73 | 74 | # PyBuilder 75 | target/ 76 | 77 | # Jupyter Notebook 78 | .ipynb_checkpoints 79 | 80 | # IPython 81 | profile_default/ 82 | ipython_config.py 83 | 84 | # pyenv 85 | .python-version 86 | 87 | # pipenv 88 | # According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control. 89 | # However, in case of collaboration, if having platform-specific dependencies or dependencies 90 | # having no cross-platform support, pipenv may install dependencies that don't work, or not 91 | # install all needed dependencies. 92 | #Pipfile.lock 93 | 94 | # PEP 582; used by e.g. github.com/David-OConnor/pyflow 95 | __pypackages__/ 96 | 97 | # Celery stuff 98 | celerybeat-schedule 99 | celerybeat.pid 100 | 101 | # SageMath parsed files 102 | *.sage.py 103 | 104 | # Environments 105 | .env 106 | .venv 107 | env/ 108 | venv/ 109 | ENV/ 110 | env.bak/ 111 | venv.bak/ 112 | 113 | # Spyder project settings 114 | .spyderproject 115 | .spyproject 116 | 117 | # Rope project settings 118 | .ropeproject 119 | 120 | # mkdocs documentation 121 | /site 122 | 123 | # mypy 124 | .mypy_cache/ 125 | .dmypy.json 126 | dmypy.json 127 | 128 | # Pyre type checker 129 | .pyre/ 130 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Audio spatialization over WebRTC 2 | 3 | Spatify provides a framework for building multichannel installations using WebRTC. 4 | 5 | With Spatify each client becomes a JACK client on the host machine, any audio 6 | sent to that client's ports will be streamed over WebRTC to the client. 7 | 8 | The original idea behind this project was to use multiple smartphones as individual 9 | speakers in installations or performances. 10 | 11 | 12 | # Installing 13 | 14 | You will need Python >= 3.7 together with websockets and aiortc python libraries. 15 | 16 | ``` 17 | $ git clone https://github.com/bgola/spatify.git 18 | $ cd spatify/ 19 | $ pip install websockets aiortc 20 | $ python setup.py install 21 | ``` 22 | 23 | # Running 24 | 25 | ``` 26 | $ spatify -h 27 | usage: spatify [-h] [--cert CERT] [--key KEY] [--host HOST] [--port PORT] [--verbose] [--quiet] 28 | 29 | Spatify server 30 | 31 | optional arguments: 32 | -h, --help show this help message and exit 33 | --cert CERT SSL certificate path (for WSS) 34 | --key KEY SSL key path (for WSS) 35 | --host HOST Host for WebSocket server (default: 0.0.0.0) 36 | --port PORT Port for WebSocket server (default: 8765) 37 | --verbose, -v 38 | --quiet, -q 39 | ``` 40 | 41 | # Checking the example 42 | 43 | In the examples/ folder there is an HTML/JavaScript example for using WebSockets as 44 | signaling mechanism and establishing the WebRTC streams. Notice that the example 45 | uses a self-signed SSL certificafe because you can't start the WebRTC stream over an 46 | unsecured connection (you need HTTPS). Your browser might complain that the certificate is 47 | not to be trusted. Also, some browsers might fail to initiate the secure WebSocket 48 | connection for the same reason. This example was tested on chromium and on chrome for android. 49 | To fix this in a real case you need a proper certificate (by using letsencrypt for example). 50 | 51 | You can use the python script to serve the examples/ folder via HTTPS (remember to edit the HTML example file 52 | to use your IP address, otherwise it will only work for localhost): 53 | 54 | ``` 55 | $ cd examples/ 56 | $ python https_server.py 57 | ``` 58 | 59 | and on another terminal run spatify: 60 | 61 | ``` 62 | $ cd examples/ 63 | $ spatify --cert localhost.crt --key localhost.key 64 | 2020-12-12 15:25,509 Listening for websocket signaling on 0.0.0.0:8765 65 | ``` 66 | 67 | Now open `https:///websockets.html` and click on "Start connection". 68 | 69 | You should see a new JACK client called `spatify_*` registered (if you use QJackCtl or 70 | Carla it should appear in the routing). Route any audio to this new client and it should play 71 | on the browser you used. 72 | -------------------------------------------------------------------------------- /examples/websocket.html: -------------------------------------------------------------------------------- 1 | 75 |
76 | 77 | -------------------------------------------------------------------------------- /spatify/rtc.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python 2 | 3 | from aiortc import RTCPeerConnection, RTCSessionDescription, RTCRtpCapabilities 4 | from aiortc.rtcicetransport import candidate_from_aioice 5 | from aiortc.contrib.media import MediaPlayer, MediaBlackhole 6 | from aiortc.contrib.signaling import object_to_string 7 | from aioice import Candidate 8 | 9 | import asyncio 10 | import json 11 | import logging 12 | import websockets 13 | import uuid 14 | 15 | logger = logging.getLogger(__name__) 16 | 17 | class WebSocketSignaling: 18 | def __init__(self, websocket, identifier): 19 | self._ws = websocket 20 | self._queue = asyncio.Queue() 21 | rtc = RTCClient.registry.get(identifier, None) 22 | if rtc is None: 23 | rtc = RTCClient(identifier) 24 | rtc.signaling = self 25 | self._rtc = rtc 26 | 27 | def __repr__(self): 28 | return f"WebSocketSignaling({self._ws.remote_address})" 29 | 30 | async def sender(self): 31 | while True: 32 | message = await self._queue.get() 33 | if not isinstance(message, str) and not isinstance(message, bytes): 34 | message = object_to_string(message) 35 | logger.info(f"Sending message to {self}: {message}") 36 | await self._ws.send(message) 37 | 38 | async def receiver(self): 39 | async for message in self._ws: 40 | logger.info(f"Got new message from {self}: {message}") 41 | data_dict = json.loads(message) 42 | await self._rtc.handle(data_dict) 43 | 44 | async def leave(self): 45 | await self._ws.close() 46 | 47 | def send(self, message): 48 | try: 49 | self._queue.put_nowait(message) 50 | except asyncio.QueueFull: 51 | logger.error(f"Can't send mesage to {self}, queue is full") 52 | 53 | 54 | class RTCClient: 55 | registry = {} 56 | 57 | def __init__(self, identifier): 58 | self.id = identifier 59 | self.peer_connection = RTCPeerConnection() 60 | self.signaling = None 61 | self.jack_client_name = f"spatify_{self.id}" 62 | RTCClient.registry[self.id] = self 63 | 64 | def send(self, message): 65 | if self.signaling is None: 66 | logger.error(f"Signaling not configure yet for {self.id}") 67 | self.signaling.send(message) 68 | 69 | async def handle(self, message): 70 | if message.get("type", None) in ["offer", "answer"]: 71 | await self.handle_offer(message) 72 | elif message.get("candidate", None) is not None: 73 | await self.handle_ice(message) 74 | elif message.get("type", None) == "bye": 75 | await self.handle_bye() 76 | 77 | async def handle_bye(self): 78 | await self.quit() 79 | 80 | async def quit(self): 81 | await self.peer_connection.close() 82 | del RTCClient.registry[self.id] 83 | 84 | async def handle_ice(self, message): 85 | candidate = message["candidate"].get("candidate", None) 86 | if not candidate: 87 | return 88 | ice_candidate = candidate_from_aioice(Candidate.from_sdp(candidate)) 89 | ice_candidate.sdpMid = message["candidate"].get("sdpMid", None) 90 | ice_candidate.sdpMLineIndex = message["candidate"].get("sdpMLineIndex", None) 91 | await self.peer_connection.addIceCandidate(ice_candidate) 92 | 93 | async def handle_offer(self, message): 94 | offer = RTCSessionDescription(**message) 95 | recorder = MediaBlackhole() 96 | 97 | @self.peer_connection.on("iceconnectionstatechange") 98 | async def on_iceconnectionstatechange(): 99 | state = self.peer_connection.iceConnectionState 100 | if state == "failed" or state == "closed": 101 | await self.quit() 102 | 103 | elif self.peer_connection.iceConnectionState == "completed": 104 | # send osc message 105 | pass 106 | 107 | @self.peer_connection.on("track") 108 | def on_track(track): 109 | if track.kind == "audio": 110 | player = MediaPlayer(self.jack_client_name, format='jack', options={'channels': '2'}) 111 | self.peer_connection.addTrack(player.audio) 112 | recorder.addTrack(track) 113 | 114 | @track.on("ended") 115 | async def on_ended(): 116 | await self.peer_connection.close() 117 | await recorder.stop() 118 | 119 | await self.peer_connection.setRemoteDescription(offer) 120 | await recorder.start() 121 | 122 | # only send high quality audio 123 | capabilities = [] 124 | for sender in self.peer_connection.getSenders(): 125 | capabilities = RTCRtpCapabilities(sender.getCapabilities('audio').codecs[:1]) 126 | 127 | for track in self.peer_connection.getTransceivers(): 128 | track.setCodecPreferences(capabilities.codecs) 129 | track._codecs = track._codecs[:1] 130 | 131 | answer = await self.peer_connection.createAnswer() 132 | await self.peer_connection.setLocalDescription(answer) 133 | self.send(self.peer_connection.localDescription) 134 | 135 | 136 | async def ws_handler(websocket, path): 137 | identifier = path.replace("/", "") 138 | if identifier == '': 139 | identifier = str(uuid.uuid4()) 140 | wsConnection = WebSocketSignaling(websocket, identifier) 141 | 142 | logger.info(f"New {wsConnection} connected.") 143 | 144 | receiver = asyncio.ensure_future( 145 | wsConnection.receiver()) 146 | sender = asyncio.ensure_future( 147 | wsConnection.sender()) 148 | 149 | wsConnection.send(json.dumps({'id': identifier})) 150 | 151 | try: 152 | done, pending = await asyncio.wait( 153 | [receiver, sender], 154 | return_when=asyncio.FIRST_COMPLETED, 155 | ) 156 | 157 | for task in pending: 158 | task.cancel() 159 | for task in done: 160 | # trigger exceptions, if any 161 | task.result() 162 | except ( 163 | websockets.exceptions.ConnectionClosedError, 164 | websockets.exceptions.ConnectionClosedOK, 165 | asyncio.exceptions.CancelledError): 166 | # Connection ended 167 | pass 168 | 169 | await wsConnection.leave() 170 | logger.info(f"{wsConnection} left") 171 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | --------------------------------------------------------------------------------