root / py / scenic / streamer.py @ 15818c72
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#
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# Scenic
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# Copyright (C) 2008 Société des arts technologiques (SAT)
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# http://www.sat.qc.ca
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# All rights reserved.
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#
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# This file is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# (at your option) any later version.
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#
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# Scenic 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
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Scenic. If not, see <http://www.gnu.org/licenses/>.
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"""
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Manages local streamer processes. |
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"""
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from scenic import process |
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from scenic import sig |
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class StreamerManager(object): |
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"""
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Manages local streamer processes. |
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""" |
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def __init__(self, app): |
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self.app = app
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# commands
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self.milhouse_recv_cmd = None |
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self.milhouse_send_cmd = None |
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self.sender = None |
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self.receiver = None |
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self.state = process.STATE_STOPPED
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self.state_changed_signal = sig.Signal()
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# for stats
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self.session_details = None # either None or a big dict |
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self.rtcp_stats = None # either None or a big dict |
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def _gather_config_to_stream(self, addr): |
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"""
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Gathers all settings in a big dict. |
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Useful for feedback to the user. |
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""" |
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contact_name = addr |
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contact = self.app._get_contact_by_addr(addr)
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if contact is not None: |
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contact_name = contact["name"]
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remote_config = self.app.remote_config
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send_width, send_height = self.app.config.video_capture_size.split("x") |
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receive_width, receive_height = remote_config["video"]["capture_size"].split("x") |
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self.session_details = {
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"peer": {
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"address": addr,
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"name": contact_name,
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}, |
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# ----------------- send ---------------
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"send": {
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"video": {
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"source": self.app.config.video_source, |
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"device": self.app.config.video_device, |
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"bitrate": self.app.config.video_bitrate, |
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"codec": remote_config["video"]["codec"], |
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"width": int(send_width), # int |
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"height": int(send_height), # int |
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"aspect-ratio": self.app.config.video_aspect_ratio, |
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"port": self.app.remote_config["video"]["port"], |
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}, |
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"audio": {
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"source": self.app.config.audio_source, |
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"numchannels": self.app.config.audio_channels, |
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"codec": self.app.config.audio_codec, |
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"port": self.app.remote_config["audio"]["port"], |
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} |
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}, |
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# -------------------- recv ------------
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"receive": {
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"video": {
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"sink": self.app.config.video_sink, |
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"codec": self.app.config.video_codec, |
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"width": int(receive_width), # int |
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"height": int(receive_height), # int |
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"deinterlace": self.app.config.video_deinterlace, # bool |
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"aspect-ratio": remote_config["video"]["aspect_ratio"], |
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"port": str(self.app.recv_video_port), #decided by the app |
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"window-title": "\"From %s\"" % (contact_name), #TODO: i18n |
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"jitterbuffer": self.app.config.video_jitterbuffer, |
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"fullscreen": self.app.config.video_fullscreen, # bool |
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"bitrate": remote_config["video"]["bitrate"], # float |
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}, |
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"audio": {
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"numchannels": self.app.config.audio_channels, # int |
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"codec": self.app.config.audio_codec, |
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"port": self.app.recv_audio_port, |
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"sink": self.app.config.audio_sink |
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} |
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} |
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} |
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if self.session_details["send"]["video"]["source"] != "v4l2src": |
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self.session_details["send"]["video"]["device"] = None |
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if self.session_details["send"]["video"]["codec"] == "theora": |
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self.session_details["send"]["video"]["bitrate"] = None |
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print(str(self.session_details)) |
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def start(self, host): |
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"""
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Starts the sender and receiver processes. |
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@param host: str ip addr |
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Raises a RuntimeError if a sesison is already in progress. |
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""" |
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if self.state != process.STATE_STOPPED: |
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raise RuntimeError("Cannot start streamers since they are %s." % (self.state)) # the programmer has done something wrong if we're here. |
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self._gather_config_to_stream(host)
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details = self.session_details
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# ------------------ send ---------------
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self.milhouse_send_cmd = [
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"milhouse",
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'--sender',
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'--address', details["peer"]["address"], |
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'--videosource', details["send"]["video"]["source"], |
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'--videocodec', details["send"]["video"]["codec"], |
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'--videoport', str(details["send"]["video"]["port"]), |
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'--width', str(details["send"]["video"]["width"]), |
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'--height', str(details["send"]["video"]["height"]), |
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'--aspect-ratio', str(details["send"]["video"]["aspect-ratio"]), |
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'--audiosource', details["send"]["audio"]["source"], |
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'--numchannels', str(details["send"]["audio"]["numchannels"]), |
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'--audiocodec', details["send"]["audio"]["codec"], |
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'--audioport', str(details["send"]["audio"]["port"]), |
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] |
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if details["send"]["video"]["source"] == "v4l2src": |
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self.milhouse_send_cmd.extend(["--videodevice", details["send"]["video"]["device"]]) |
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if details["send"]["video"]["codec"] != "theora": |
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self.milhouse_send_cmd.extend(['--videobitrate', str(int(details["send"]["video"]["bitrate"] * 1000000))]) |
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# ------------------- recv ----------------
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self.milhouse_recv_cmd = [
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"milhouse",
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'--receiver',
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'--address', details["peer"]["address"], |
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'--videosink', details["receive"]["video"]["sink"], |
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'--videocodec', details["receive"]["video"]["codec"], |
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'--videoport', str(details["receive"]["video"]["port"]), |
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'--jitterbuffer', str(details["receive"]["video"]["jitterbuffer"]), |
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'--width', str(details["receive"]["video"]["width"]), |
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'--height', str(details["receive"]["video"]["height"]), |
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'--aspect-ratio', details["receive"]["video"]["aspect-ratio"], |
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'--audiosink', details["receive"]["audio"]["sink"], |
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'--numchannels', str(details["receive"]["audio"]["numchannels"]), |
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'--audiocodec', details["receive"]["audio"]["codec"], |
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'--audioport', str(details["receive"]["audio"]["port"]), |
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'--window-title', details["receive"]["video"]["window-title"], |
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] |
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if details["receive"]["video"]["fullscreen"]: |
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self.milhouse_recv_cmd.append('--fullscreen') |
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if details["receive"]["video"]["deinterlace"]: |
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self.milhouse_recv_cmd.append('--deinterlace') |
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# setting up
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self.rtcp_stats = {
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"send": {
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"video": {
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"packets-lost": 0, |
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"packets-sent": 0, |
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"jitter": 0, |
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"bitrate": 0, |
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"connected": False |
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}, |
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"audio": {
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"packets-lost": 0, |
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"packets-sent": 0, |
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"jitter": 0, |
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"bitrate": 0, |
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"connected": False |
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} |
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}, |
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"receive": {
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"video": {
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"connected": False |
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}, |
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"audio": {
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"connected": False |
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} |
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} |
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} |
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recv_cmd = " ".join(self.milhouse_recv_cmd) |
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self.receiver = process.ProcessManager(command=recv_cmd, identifier="receiver") |
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self.receiver.state_changed_signal.connect(self.on_process_state_changed) |
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self.receiver.stdout_line_signal.connect(self.on_receiver_stdout_line) |
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self.receiver.stderr_line_signal.connect(self.on_receiver_stderr_line) |
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send_cmd = " ".join(self.milhouse_send_cmd) |
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self.sender = process.ProcessManager(command=send_cmd, identifier="sender") |
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self.sender.state_changed_signal.connect(self.on_process_state_changed) |
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self.sender.stdout_line_signal.connect(self.on_sender_stdout_line) |
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self.sender.stderr_line_signal.connect(self.on_sender_stderr_line) |
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# starting
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self._set_state(process.STATE_STARTING)
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print "$", send_cmd |
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self.sender.start()
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print "$", recv_cmd |
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self.receiver.start()
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def on_receiver_stdout_line(self, line): |
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"""
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Handles a new line from our receiver process' stdout |
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""" |
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if "stream connected" in line: |
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if "audio" in line: |
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self.rtcp_stats["receive"]["audio"]["connected"] = True |
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elif "video" in line: |
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self.rtcp_stats["receive"]["video"]["connected"] = True |
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else:
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print "%9s stdout: %s" % (self.receiver.identifier, line) |
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def on_receiver_stderr_line(self, line): |
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"""
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Handles a new line from our receiver process' stderr |
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""" |
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print "%9s stdout: %s" % (self.receiver.identifier, line) |
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def on_sender_stdout_line(self, line): |
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"""
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Handles a new line from our receiver process' stdout |
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""" |
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def _line_contains_a_video_codec(line): |
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return "mpeg4" in line or "theora" in line or "h263" in line or "h264" in line |
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def _line_contains_an_audio_codec(line): |
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return "raw" in line or "mp3" in line or "vorbis" in line |
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print "%9s stdout: %s" % (self.sender.identifier, line) |
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if "PACKETS-LOST" in line: |
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if _line_contains_a_video_codec(line):
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self.rtcp_stats["send"]["video"]["packets-lost"] = int(line.split(":")[-1]) |
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elif _line_contains_an_audio_codec(line):
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self.rtcp_stats["send"]["audio"]["packets-lost"] = int(line.split(":")[-1]) |
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if "PACKETS-SENT" in line: |
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if _line_contains_a_video_codec(line):
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self.rtcp_stats["send"]["video"]["packets-sent"] = int(line.split(":")[-1]) |
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elif _line_contains_an_audio_codec(line):
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self.rtcp_stats["send"]["audio"]["packets-sent"] = int(line.split(":")[-1]) |
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elif "JITTER" in line: |
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if _line_contains_a_video_codec(line):
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self.rtcp_stats["send"]["video"]["jitter"] = int(line.split(":")[-1]) |
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elif _line_contains_an_audio_codec(line):
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self.rtcp_stats["send"]["audio"]["jitter"] = int(line.split(":")[-1]) |
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elif "connected" in line: |
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if _line_contains_a_video_codec(line):
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self.rtcp_stats["send"]["video"]["connected"] = True |
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elif _line_contains_an_audio_codec(line):
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self.rtcp_stats["send"]["audio"]["connected"] = True |
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def on_sender_stderr_line(self, line): |
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"""
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Handles a new line from our receiver process' stderr |
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""" |
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print "%9s stderr: %s" % (self.sender.identifier, line) |
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def is_busy(self): |
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"""
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Retuns True if a streaming session is in progress. |
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""" |
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return self.state != process.STATE_STOPPED |
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def on_process_state_changed(self, process_manager, process_state): |
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"""
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Slot for the ProcessManager.state_changed_signal |
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Calls stop() if one of the processes crashed. |
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""" |
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print process_manager, process_state
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if process_state == process.STATE_RUNNING:
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# As soon as one is running, set our state to running
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if self.state == process.STATE_STARTING: |
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self._set_state(process.STATE_RUNNING)
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elif process_state == process.STATE_STOPPING:
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pass
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elif process_state == process.STATE_STARTING:
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pass
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elif process_state == process.STATE_STOPPED:
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# As soon as one crashes or is not able to start, stop all streamer processes.
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if self.state in [process.STATE_RUNNING, process.STATE_STARTING]: |
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print("A streamer process died. Stopping the local streamer manager.")
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self.stop() # sets self.state to STOPPING |
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# Next, if all streamers are dead, we can say this manager is stopped
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if self.state == process.STATE_STOPPING: |
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one_is_left = False
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for proc in [self.sender, self.receiver]: |
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if process_manager is not proc and proc.state != process.STATE_STOPPED: |
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print("Streamer process %s is not dead, so we are not done stopping. Its state is %s." % (proc, proc.state))
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one_is_left = True
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if not one_is_left: |
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print "Setting streamers manager to STOPPED" |
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self._set_state(process.STATE_STOPPED)
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def _set_state(self, new_state): |
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"""
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Handles state changes. |
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""" |
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if self.state != new_state: |
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self.state_changed_signal(self, new_state) |
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self.state = new_state
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else:
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raise RuntimeError("Setting state to %s, which is already the current state." % (self.state)) |
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def stop(self): |
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"""
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Stops the sender and receiver processes. |
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Does not send any message to the remote peer ! This must be done somewhere else. |
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""" |
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#TODO: return a deferred
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# stopping
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if self.state in [process.STATE_RUNNING, process.STATE_STARTING]: |
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self._set_state(process.STATE_STOPPING)
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for proc in [self.sender, self.receiver]: |
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if proc is not None: |
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if proc.state != process.STATE_STOPPED and proc.state != process.STATE_STOPPING: |
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proc.stop() |