Merge 'upstream/master'

1 files changed, 0 insertions, 884 deletions

diff --git a/plugins/rtp/src/stream.vala b/plugins/rtp/src/stream.vala
deleted file mode 100644
index aa2b080d..00000000
--- a/plugins/rtp/src/stream.vala
+++ /dev/null
@@ -1,884 +0,0 @@
-using Gee;
-using Xmpp;
-
-public class Dino.Plugins.Rtp.Stream : Xmpp.Xep.JingleRtp.Stream {
-    public uint8 rtpid { get; private set; }
-
-    public Plugin plugin { get; private set; }
-    public Gst.Pipeline pipe { get {
-        return plugin.pipe;
-    }}
-    public Gst.Element rtpbin { get {
-        return plugin.rtpbin;
-    }}
-    public CodecUtil codec_util { get {
-        return plugin.codec_util;
-    }}
-    private Gst.App.Sink send_rtp;
-    private Gst.App.Sink send_rtcp;
-    private Gst.App.Src recv_rtp;
-    private Gst.App.Src recv_rtcp;
-    private Gst.Element decode;
-    private Gst.RTP.BaseDepayload decode_depay;
-    private Gst.Element input;
-    private Gst.Pad input_pad;
-    private Gst.Element output;
-    private Gst.Element session;
-
-    private Device _input_device;
-    public Device input_device { get { return _input_device; } set {
-        if (sending && !paused) {
-            var input = this.input;
-            set_input(value != null ? value.link_source(payload_type, our_ssrc, next_seqnum_offset, next_timestamp_offset) : null);
-            if (this._input_device != null) this._input_device.unlink(input);
-        }
-        this._input_device = value;
-    }}
-    private Device _output_device;
-    public Device output_device { get { return _output_device; } set {
-        if (output != null) remove_output(output);
-        if (value != null && receiving) add_output(value.link_sink());
-        this._output_device = value;
-    }}
-
-    public bool created { get; private set; default = false; }
-    public bool paused { get; private set; default = false; }
-    private bool push_recv_data = false;
-    private uint our_ssrc = Random.next_int();
-    private int next_seqnum_offset = -1;
-    private uint32 next_timestamp_offset_base = 0;
-    private int64 next_timestamp_offset_stamp = 0;
-    private uint32 next_timestamp_offset { get {
-        if (next_timestamp_offset_base == 0) return 0;
-        int64 monotonic_diff = get_monotonic_time() - next_timestamp_offset_stamp;
-        return next_timestamp_offset_base + (uint32)((double)monotonic_diff / 1000000.0 * payload_type.clockrate);
-    } }
-    private uint32 participant_ssrc = 0;
-
-    private Gst.Pad recv_rtcp_sink_pad;
-    private Gst.Pad recv_rtp_sink_pad;
-    private Gst.Pad recv_rtp_src_pad;
-    private Gst.Pad send_rtcp_src_pad;
-    private Gst.Pad send_rtp_sink_pad;
-    private Gst.Pad send_rtp_src_pad;
-
-    private Crypto.Srtp.Session? crypto_session = new Crypto.Srtp.Session();
-
-    public Stream(Plugin plugin, Xmpp.Xep.Jingle.Content content) {
-        base(content);
-        this.plugin = plugin;
-        this.rtpid = plugin.next_free_id();
-
-        content.notify["senders"].connect_after(on_senders_changed);
-    }
-
-    public void on_senders_changed() {
-        if (sending && input == null) {
-            input_device = input_device;
-        }
-        if (receiving && output == null) {
-            output_device = output_device;
-        }
-    }
-
-    public override void create() {
-        plugin.pause();
-
-        // Create i/o if needed
-
-        if (input == null && sending) {
-            input_device = input_device;
-        }
-        if (output == null && receiving && media == "audio") {
-            output_device = output_device;
-        }
-
-        // Create app elements
-        send_rtp = Gst.ElementFactory.make("appsink", @"rtp_sink_$rtpid") as Gst.App.Sink;
-        send_rtp.async = false;
-        send_rtp.caps = CodecUtil.get_caps(media, payload_type, false);
-        send_rtp.emit_signals = true;
-        send_rtp.sync = true;
-        send_rtp.drop = true;
-        send_rtp.wait_on_eos = false;
-        send_rtp.new_sample.connect(on_new_sample);
-#if GST_1_20
-        send_rtp.new_serialized_event.connect(on_new_event);
-#endif
-        send_rtp.connect("signal::eos", on_eos_static, this);
-        pipe.add(send_rtp);
-
-        send_rtcp = Gst.ElementFactory.make("appsink", @"rtcp_sink_$rtpid") as Gst.App.Sink;
-        send_rtcp.async = false;
-        send_rtcp.caps = new Gst.Caps.empty_simple("application/x-rtcp");
-        send_rtcp.emit_signals = true;
-        send_rtcp.sync = true;
-        send_rtcp.drop = true;
-        send_rtcp.wait_on_eos = false;
-        send_rtcp.new_sample.connect(on_new_sample);
-        send_rtcp.connect("signal::eos", on_eos_static, this);
-        pipe.add(send_rtcp);
-
-        recv_rtp = Gst.ElementFactory.make("appsrc", @"rtp_src_$rtpid") as Gst.App.Src;
-        recv_rtp.caps = CodecUtil.get_caps(media, payload_type, true);
-        recv_rtp.do_timestamp = true;
-        recv_rtp.format = Gst.Format.TIME;
-        recv_rtp.is_live = true;
-        pipe.add(recv_rtp);
-
-        recv_rtcp = Gst.ElementFactory.make("appsrc", @"rtcp_src_$rtpid") as Gst.App.Src;
-        recv_rtcp.caps = new Gst.Caps.empty_simple("application/x-rtcp");
-        recv_rtcp.do_timestamp = true;
-        recv_rtcp.format = Gst.Format.TIME;
-        recv_rtcp.is_live = true;
-        pipe.add(recv_rtcp);
-
-        // Connect RTCP
-        send_rtcp_src_pad = rtpbin.get_request_pad(@"send_rtcp_src_$rtpid");
-        send_rtcp_src_pad.link(send_rtcp.get_static_pad("sink"));
-        recv_rtcp_sink_pad = rtpbin.get_request_pad(@"recv_rtcp_sink_$rtpid");
-        recv_rtcp.get_static_pad("src").link(recv_rtcp_sink_pad);
-
-        // Connect input
-        send_rtp_sink_pad = rtpbin.get_request_pad(@"send_rtp_sink_$rtpid");
-        if (input != null) {
-            input_pad = input.get_request_pad(@"src_$rtpid");
-            input_pad.link(send_rtp_sink_pad);
-        }
-
-        // Connect output
-        decode = codec_util.get_decode_bin(media, payload_type, @"decode_$rtpid");
-        decode_depay = (Gst.RTP.BaseDepayload)((Gst.Bin)decode).get_by_name(@"decode_$(rtpid)_rtp_depay");
-        pipe.add(decode);
-        if (output != null) {
-            decode.link(output);
-        }
-
-        // Connect RTP
-        recv_rtp_sink_pad = rtpbin.get_request_pad(@"recv_rtp_sink_$rtpid");
-        recv_rtp.get_static_pad("src").link(recv_rtp_sink_pad);
-
-        created = true;
-        push_recv_data = true;
-        plugin.unpause();
-
-        GLib.Signal.emit_by_name(rtpbin, "get-session", rtpid, out session);
-        if (session != null && remb_enabled) {
-            Object internal_session;
-            session.@get("internal-session", out internal_session);
-            if (internal_session != null) {
-                internal_session.connect("signal::on-feedback-rtcp", on_feedback_rtcp, this);
-            }
-            Timeout.add(1000, () => remb_adjust());
-        }
-        if (input_device != null && media == "video") {
-            input_device.update_bitrate(payload_type, target_send_bitrate);
-        }
-    }
-
-    private int last_packets_lost = -1;
-    private uint64 last_packets_received = 0;
-    private uint64 last_octets_received = 0;
-    private uint max_target_receive_bitrate = 0;
-    private int64 last_remb_time = 0;
-    private bool remb_adjust() {
-        unowned Gst.Structure? stats;
-        if (session == null) {
-            debug("Session for %u finished, turning off remb adjustment", rtpid);
-            return Source.REMOVE;
-        }
-        session.get("stats", out stats);
-        if (stats == null) {
-            warning("No stats for session %u", rtpid);
-            return Source.REMOVE;
-        }
-        unowned ValueArray? source_stats;
-        stats.get("source-stats", typeof(ValueArray), out source_stats);
-        if (source_stats == null) {
-            warning("No source-stats for session %u", rtpid);
-            return Source.REMOVE;
-        }
-
-        if (input_device == null) return Source.CONTINUE;
-
-        foreach (Value value in source_stats.values) {
-            unowned Gst.Structure source_stat = (Gst.Structure) value.get_boxed();
-            uint32 ssrc;
-            if (!source_stat.get_uint("ssrc", out ssrc)) continue;
-            if (ssrc == participant_ssrc) {
-                int packets_lost;
-                uint64 packets_received, octets_received;
-                source_stat.get_int("packets-lost", out packets_lost);
-                source_stat.get_uint64("packets-received", out packets_received);
-                source_stat.get_uint64("octets-received", out octets_received);
-                int new_lost = packets_lost - last_packets_lost;
-                if (new_lost < 0) new_lost = 0;
-                uint64 new_received = packets_received - last_packets_received;
-                if (packets_received < last_packets_received) new_received = 0;
-                uint64 new_octets = octets_received - last_octets_received;
-                if (octets_received < last_octets_received) octets_received = 0;
-                if (new_received == 0) continue;
-                last_packets_lost = packets_lost;
-                last_packets_received = packets_received;
-                last_octets_received = octets_received;
-                double loss_rate = (double)new_lost / (double)(new_lost + new_received);
-                uint new_target_receive_bitrate;
-                if (new_lost <= 0 || loss_rate < 0.02) {
-                    new_target_receive_bitrate = (uint)(1.08 * (double)target_receive_bitrate);
-                } else if (loss_rate > 0.1) {
-                    new_target_receive_bitrate = (uint)((1.0 - 0.5 * loss_rate) * (double)target_receive_bitrate);
-                } else {
-                    new_target_receive_bitrate = target_receive_bitrate;
-                }
-                if (last_remb_time == 0) {
-                    last_remb_time = get_monotonic_time();
-                } else {
-                    int64 time_now = get_monotonic_time();
-                    int64 time_diff = time_now - last_remb_time;
-                    last_remb_time = time_now;
-                    uint actual_bitrate = (uint)(((double)new_octets * 8.0) * (double)time_diff / 1000.0 / 1000000.0);
-                    new_target_receive_bitrate = uint.max(new_target_receive_bitrate, (uint)(0.9 * (double)actual_bitrate));
-                    max_target_receive_bitrate = uint.max((uint)(1.5 * (double)actual_bitrate), max_target_receive_bitrate);
-                    new_target_receive_bitrate = uint.min(new_target_receive_bitrate, max_target_receive_bitrate);
-                }
-                new_target_receive_bitrate = uint.max(16, new_target_receive_bitrate); // Never go below 16
-                if (new_target_receive_bitrate != target_receive_bitrate) {
-                    target_receive_bitrate = new_target_receive_bitrate;
-                    uint8[] data = new uint8[] {
-                        143, 206, 0, 5,
-                        0, 0, 0, 0,
-                        0, 0, 0, 0,
-                        'R', 'E', 'M', 'B',
-                        1, 0, 0, 0,
-                        0, 0, 0, 0
-                    };
-                    data[4] = (uint8)((our_ssrc >> 24) & 0xff);
-                    data[5] = (uint8)((our_ssrc >> 16) & 0xff);
-                    data[6] = (uint8)((our_ssrc >> 8) & 0xff);
-                    data[7] = (uint8)(our_ssrc & 0xff);
-                    uint8 br_exp = 0;
-                    uint32 br_mant = target_receive_bitrate * 1000;
-                    uint8 bits = (uint8)Math.log2(br_mant);
-                    if (bits > 16) {
-                        br_exp = (uint8)bits - 16;
-                        br_mant = br_mant >> br_exp;
-                    }
-                    data[17] = (uint8)((br_exp << 2) | ((br_mant >> 16) & 0x3));
-                    data[18] = (uint8)((br_mant >> 8) & 0xff);
-                    data[19] = (uint8)(br_mant & 0xff);
-                    data[20] = (uint8)((ssrc >> 24) & 0xff);
-                    data[21] = (uint8)((ssrc >> 16) & 0xff);
-                    data[22] = (uint8)((ssrc >> 8) & 0xff);
-                    data[23] = (uint8)(ssrc & 0xff);
-                    encrypt_and_send_rtcp(data);
-                }
-            }
-        }
-        return Source.CONTINUE;
-    }
-
-    private static void on_feedback_rtcp(Gst.Element session, uint type, uint fbtype, uint sender_ssrc, uint media_ssrc, Gst.Buffer? fci, Stream self) {
-        if (self.input_device != null && self.media == "video" && type == 206 && fbtype == 15 && fci != null && sender_ssrc == self.participant_ssrc) {
-            // https://tools.ietf.org/html/draft-alvestrand-rmcat-remb-03
-            uint8[] data;
-            fci.extract_dup(0, fci.get_size(), out data);
-            if (data[0] != 'R' || data[1] != 'E' || data[2] != 'M' || data[3] != 'B') return;
-            uint8 br_exp = data[5] >> 2;
-            uint32 br_mant = (((uint32)data[5] & 0x3) << 16) + ((uint32)data[6] << 8) + (uint32)data[7];
-            self.target_send_bitrate = (br_mant << br_exp) / 1000;
-            self.input_device.update_bitrate(self.payload_type, self.target_send_bitrate);
-        }
-    }
-
-    private void prepare_local_crypto() {
-        if (local_crypto != null && local_crypto.is_valid && !crypto_session.has_encrypt) {
-            crypto_session.set_encryption_key(local_crypto.crypto_suite, local_crypto.key, local_crypto.salt);
-            debug("Setting up encryption with key params %s", local_crypto.key_params);
-        }
-    }
-
-    bool flip = false;
-    uint8 rotation = 0;
-#if GST_1_20
-    private bool on_new_event(Gst.App.Sink sink) {
-        if (sink == null || sink != send_rtp) {
-            return false;
-        }
-        Gst.MiniObject obj = sink.try_pull_object(0);
-        if (obj.type == typeof(Gst.Event)) {
-            unowned Gst.TagList tags;
-            if (((Gst.Event)obj).type == Gst.EventType.TAG) {
-                ((Gst.Event)obj).parse_tag(out tags);
-                Gst.Video.OrientationMethod orientation_method;
-                Gst.Video.Orientation.from_tag(tags, out orientation_method);
-                switch (orientation_method) {
-                    case Gst.Video.OrientationMethod.IDENTITY:
-                    case Gst.Video.OrientationMethod.VERT:
-                    default:
-                        rotation = 0;
-                        break;
-                    case Gst.Video.OrientationMethod.@90R:
-                    case Gst.Video.OrientationMethod.UL_LR:
-                        rotation = 1;
-                        break;
-                    case Gst.Video.OrientationMethod.@180:
-                    case Gst.Video.OrientationMethod.HORIZ:
-                        rotation = 2;
-                        break;
-                    case Gst.Video.OrientationMethod.@90L:
-                    case Gst.Video.OrientationMethod.UR_LL:
-                        rotation = 3;
-                        break;
-                }
-                switch (orientation_method) {
-                    case Gst.Video.OrientationMethod.IDENTITY:
-                    case Gst.Video.OrientationMethod.@90R:
-                    case Gst.Video.OrientationMethod.@180:
-                    case Gst.Video.OrientationMethod.@90L:
-                    default:
-                        flip = false;
-                        break;
-                    case Gst.Video.OrientationMethod.VERT:
-                    case Gst.Video.OrientationMethod.UL_LR:
-                    case Gst.Video.OrientationMethod.HORIZ:
-                    case Gst.Video.OrientationMethod.UR_LL:
-                        flip = true;
-                        break;
-                }
-            }
-        }
-        return false;
-    }
-#endif
-
-    private Gst.FlowReturn on_new_sample(Gst.App.Sink sink) {
-        if (sink == null) {
-            debug("Sink is null");
-            return Gst.FlowReturn.EOS;
-        }
-        if (sink != send_rtp && sink != send_rtcp) {
-            warning("unknown sample");
-            return Gst.FlowReturn.NOT_SUPPORTED;
-        }
-        Gst.Sample sample = sink.pull_sample();
-        Gst.Buffer buffer = sample.get_buffer();
-        if (sink == send_rtp) {
-            uint buffer_ssrc = 0, buffer_seq = 0;
-            Gst.RTP.Buffer rtp_buffer;
-            if (Gst.RTP.Buffer.map(buffer, Gst.MapFlags.READ, out rtp_buffer)) {
-                buffer_ssrc = rtp_buffer.get_ssrc();
-                buffer_seq = rtp_buffer.get_seq();
-                next_seqnum_offset = rtp_buffer.get_seq() + 1;
-                next_timestamp_offset_base = rtp_buffer.get_timestamp();
-                next_timestamp_offset_stamp = get_monotonic_time();
-                rtp_buffer.unmap();
-            }
-#if GLIB_2_64
-            if (our_ssrc != buffer_ssrc) {
-                warning_once("Sending RTP %s buffer seq %u with SSRC %u when our ssrc is %u", media, buffer_seq, buffer_ssrc, our_ssrc);
-            }
-#endif
-        }
-
-#if GST_1_20
-        if (sink == send_rtp) {
-            Xmpp.Xep.JingleRtp.HeaderExtension? ext = header_extensions.first_match((it) => it.uri == "urn:3gpp:video-orientation");
-            if (ext != null) {
-                buffer = (Gst.Buffer) buffer.make_writable();
-                Gst.RTP.Buffer rtp_buffer;
-                if (Gst.RTP.Buffer.map(buffer, Gst.MapFlags.WRITE, out rtp_buffer)) {
-                    uint8[] extension_data = new uint8[1];
-                    bool camera = false;
-                    extension_data[0] = extension_data[0] | (rotation & 0x3);
-                    if (flip) extension_data[0] = extension_data[0] | 0x4;
-                    if (camera) extension_data[0] = extension_data[0] | 0x8;
-                    rtp_buffer.add_extension_onebyte_header(ext.id, extension_data);
-                }
-            }
-        }
-#endif
-
-        prepare_local_crypto();
-
-        uint8[] data;
-        buffer.extract_dup(0, buffer.get_size(), out data);
-        if (sink == send_rtp) {
-            encrypt_and_send_rtp((owned) data);
-        } else if (sink == send_rtcp) {
-            encrypt_and_send_rtcp((owned) data);
-        }
-        return Gst.FlowReturn.OK;
-    }
-
-    private void encrypt_and_send_rtp(owned uint8[] data) {
-        Bytes bytes;
-        if (crypto_session.has_encrypt) {
-            bytes = new Bytes.take(crypto_session.encrypt_rtp(data));
-        } else {
-            bytes = new Bytes.take(data);
-        }
-        on_send_rtp_data(bytes);
-    }
-
-    private void encrypt_and_send_rtcp(owned uint8[] data) {
-        Bytes bytes;
-        if (crypto_session.has_encrypt) {
-            bytes = new Bytes.take(crypto_session.encrypt_rtcp(data));
-        } else {
-            bytes = new Bytes.take(data);
-        }
-        if (rtcp_mux) {
-            on_send_rtp_data(bytes);
-        } else {
-            on_send_rtcp_data(bytes);
-        }
-    }
-
-    private static Gst.PadProbeReturn drop_probe() {
-        return Gst.PadProbeReturn.DROP;
-    }
-
-    private static void on_eos_static(Gst.App.Sink sink, Stream self) {
-        debug("EOS on %s", sink.name);
-        if (sink == self.send_rtp) {
-            Idle.add(() => { self.on_send_rtp_eos(); return Source.REMOVE; });
-        } else if (sink == self.send_rtcp) {
-            Idle.add(() => { self.on_send_rtcp_eos(); return Source.REMOVE; });
-        }
-    }
-
-    private void on_send_rtp_eos() {
-        if (send_rtp_src_pad != null) {
-            send_rtp_src_pad.unlink(send_rtp.get_static_pad("sink"));
-            send_rtp_src_pad = null;
-        }
-        send_rtp.set_locked_state(true);
-        send_rtp.set_state(Gst.State.NULL);
-        // This happens async, so pipe might be gone by now.
-        if (pipe != null) pipe.remove(send_rtp);
-        send_rtp = null;
-        debug("Stopped sending RTP for %u", rtpid);
-    }
-
-    private void on_send_rtcp_eos() {
-        send_rtcp.set_locked_state(true);
-        send_rtcp.set_state(Gst.State.NULL);
-        // This happens async, so pipe might be gone by now.
-        if (pipe != null) pipe.remove(send_rtcp);
-        send_rtcp = null;
-        debug("Stopped sending RTCP for %u", rtpid);
-    }
-
-    public override void destroy() {
-        // Stop network communication
-        push_recv_data = false;
-        if (recv_rtp != null) recv_rtp.end_of_stream();
-        if (recv_rtcp != null) recv_rtcp.end_of_stream();
-        if (send_rtp != null) send_rtp.new_sample.disconnect(on_new_sample);
-        if (send_rtcp != null) send_rtcp.new_sample.disconnect(on_new_sample);
-
-        // Disconnect input device
-        if (input != null) {
-            input_pad.unlink(send_rtp_sink_pad);
-            input.release_request_pad(input_pad);
-            input_pad = null;
-        }
-        if (this._input_device != null) {
-            if (!paused) this._input_device.unlink(input);
-            this._input_device = null;
-            this.input = null;
-        }
-
-        // Inject EOS
-        if (send_rtp_sink_pad != null) {
-            send_rtp_sink_pad.send_event(new Gst.Event.eos());
-        }
-
-        // Disconnect decode
-        if (recv_rtp_src_pad != null) {
-            recv_rtp_src_pad.add_probe(Gst.PadProbeType.BLOCK, drop_probe);
-            recv_rtp_src_pad.unlink(decode.get_static_pad("sink"));
-        }
-
-        // Disconnect output
-        if (output != null) {
-            decode.get_static_pad("src").add_probe(Gst.PadProbeType.BLOCK, drop_probe);
-            decode.unlink(output);
-        }
-
-        // Disconnect output device
-        if (this._output_device != null) {
-            this._output_device.unlink(output);
-            this._output_device = null;
-        }
-        output = null;
-
-        // Destroy decode
-        if (decode != null) {
-            decode.set_locked_state(true);
-            decode.set_state(Gst.State.NULL);
-            pipe.remove(decode);
-            decode = null;
-            decode_depay = null;
-        }
-
-        // Disconnect and remove RTP input
-        if (recv_rtp != null) {
-            recv_rtp.get_static_pad("src").unlink(recv_rtp_sink_pad);
-            recv_rtp.set_locked_state(true);
-            recv_rtp.set_state(Gst.State.NULL);
-            pipe.remove(recv_rtp);
-            recv_rtp = null;
-        }
-
-        // Disconnect and remove RTCP input
-        if (recv_rtcp != null) {
-            recv_rtcp.get_static_pad("src").unlink(recv_rtcp_sink_pad);
-            recv_rtcp.set_locked_state(true);
-            recv_rtcp.set_state(Gst.State.NULL);
-            pipe.remove(recv_rtcp);
-            recv_rtcp = null;
-        }
-
-        // Release rtp pads
-        if (send_rtp_sink_pad != null) {
-            rtpbin.release_request_pad(send_rtp_sink_pad);
-            send_rtp_sink_pad = null;
-        }
-        if (recv_rtp_sink_pad != null) {
-            rtpbin.release_request_pad(recv_rtp_sink_pad);
-            recv_rtp_sink_pad = null;
-        }
-        if (send_rtcp_src_pad != null) {
-            rtpbin.release_request_pad(send_rtcp_src_pad);
-            send_rtcp_src_pad = null;
-        }
-        if (recv_rtcp_sink_pad != null) {
-            rtpbin.release_request_pad(recv_rtcp_sink_pad);
-            recv_rtcp_sink_pad = null;
-        }
-    }
-
-    private void prepare_remote_crypto() {
-        if (remote_crypto != null && remote_crypto.is_valid && !crypto_session.has_decrypt) {
-            crypto_session.set_decryption_key(remote_crypto.crypto_suite, remote_crypto.key, remote_crypto.salt);
-            debug("Setting up decryption with key params %s", remote_crypto.key_params);
-        }
-    }
-
-    private uint16 previous_incoming_video_orientation_degree = uint16.MAX;
-    public signal void incoming_video_orientation_changed(uint16 degree);
-
-    public override void on_recv_rtp_data(Bytes bytes) {
-        if (rtcp_mux && bytes.length >= 2 && bytes.get(1) >= 192 && bytes.get(1) < 224) {
-            on_recv_rtcp_data(bytes);
-            return;
-        }
-#if GST_1_16
-        {
-            Gst.Buffer buffer = new Gst.Buffer.wrapped_bytes(bytes);
-            Gst.RTP.Buffer rtp_buffer;
-            uint buffer_ssrc = 0, buffer_seq = 0;
-            if (Gst.RTP.Buffer.map(buffer, Gst.MapFlags.READ, out rtp_buffer)) {
-                buffer_ssrc = rtp_buffer.get_ssrc();
-                buffer_seq = rtp_buffer.get_seq();
-                rtp_buffer.unmap();
-            }
-        }
-#endif
-        if (push_recv_data) {
-            prepare_remote_crypto();
-
-            Gst.Buffer buffer;
-            if (crypto_session.has_decrypt) {
-                try {
-                    buffer = new Gst.Buffer.wrapped(crypto_session.decrypt_rtp(bytes.get_data()));
-                } catch (Error e) {
-                    warning("%s (%d)", e.message, e.code);
-                    return;
-                }
-            } else {
-#if GST_1_16
-                buffer = new Gst.Buffer.wrapped_bytes(bytes);
-#else
-                buffer = new Gst.Buffer.wrapped(bytes.get_data());
-#endif
-            }
-
-            Gst.RTP.Buffer rtp_buffer;
-            if (Gst.RTP.Buffer.map(buffer, Gst.MapFlags.READ, out rtp_buffer)) {
-                if (rtp_buffer.get_extension()) {
-                    Xmpp.Xep.JingleRtp.HeaderExtension? ext = header_extensions.first_match((it) => it.uri == "urn:3gpp:video-orientation");
-                    if (ext != null) {
-                        unowned uint8[] extension_data;
-                        if (rtp_buffer.get_extension_onebyte_header(ext.id, 0, out extension_data) && extension_data.length == 1) {
-                            bool camera = (extension_data[0] & 0x8) > 0;
-                            bool flip = (extension_data[0] & 0x4) > 0;
-                            uint8 rotation = extension_data[0] & 0x3;
-                            uint16 rotation_degree = uint16.MAX;
-                            switch(rotation) {
-                                case 0: rotation_degree = 0; break;
-                                case 1: rotation_degree = 90; break;
-                                case 2: rotation_degree = 180; break;
-                                case 3: rotation_degree = 270; break;
-                            }
-                            if (rotation_degree != previous_incoming_video_orientation_degree) {
-                                incoming_video_orientation_changed(rotation_degree);
-                                previous_incoming_video_orientation_degree = rotation_degree;
-                            }
-                        }
-                    }
-                }
-                rtp_buffer.unmap();
-            }
-
-#if VALA_0_50
-            recv_rtp.push_buffer((owned) buffer);
-#else
-            Gst.FlowReturn ret;
-            GLib.Signal.emit_by_name(recv_rtp, "push-buffer", buffer, out ret);
-#endif
-        }
-    }
-
-    public override void on_recv_rtcp_data(Bytes bytes) {
-        if (push_recv_data) {
-            prepare_remote_crypto();
-
-            Gst.Buffer buffer;
-            if (crypto_session.has_decrypt) {
-                try {
-                    buffer = new Gst.Buffer.wrapped(crypto_session.decrypt_rtcp(bytes.get_data()));
-                } catch (Error e) {
-                    warning("%s (%d)", e.message, e.code);
-                    return;
-                }
-            } else {
-#if GST_1_16
-                buffer = new Gst.Buffer.wrapped_bytes(bytes);
-#else
-                buffer = new Gst.Buffer.wrapped(bytes.get_data());
-#endif
-            }
-
-#if VALA_0_50
-            recv_rtcp.push_buffer((owned) buffer);
-#else
-            Gst.FlowReturn ret;
-            GLib.Signal.emit_by_name(recv_rtcp, "push-buffer", buffer, out ret);
-#endif
-        }
-    }
-
-    public override void on_rtp_ready() {
-        // If full frame has been sent before the connection was ready, the counterpart would only display our video after the next full frame.
-        // Send a full frame to let the counterpart display our video asap
-        rtpbin.send_event(new Gst.Event.custom(
-                Gst.EventType.CUSTOM_UPSTREAM,
-                new Gst.Structure("GstForceKeyUnit", "all-headers", typeof(bool), true, null))
-        );
-    }
-
-    public override void on_rtcp_ready() {
-        int rtp_session_id = (int) rtpid;
-        uint64 max_delay = int.MAX;
-        Object rtp_session;
-        bool rtp_sent;
-        GLib.Signal.emit_by_name(rtpbin, "get-internal-session", rtp_session_id, out rtp_session);
-        GLib.Signal.emit_by_name(rtp_session, "send-rtcp-full", max_delay, out rtp_sent);
-        debug("RTCP is ready, resending rtcp: %s", rtp_sent.to_string());
-    }
-
-    public void on_ssrc_pad_added(uint32 ssrc, Gst.Pad pad) {
-        debug("New ssrc %u with pad %s", ssrc, pad.name);
-        if (participant_ssrc != 0 && participant_ssrc != ssrc) {
-            warning("Got second ssrc on stream (old: %u, new: %u), ignoring", participant_ssrc, ssrc);
-            return;
-        }
-        participant_ssrc = ssrc;
-        recv_rtp_src_pad = pad;
-        if (decode != null) {
-            plugin.pause();
-            debug("Link %s to %s decode for %s", recv_rtp_src_pad.name, media, name);
-            recv_rtp_src_pad.link(decode.get_static_pad("sink"));
-            plugin.unpause();
-        }
-    }
-
-    public void on_send_rtp_src_added(Gst.Pad pad) {
-        send_rtp_src_pad = pad;
-        if (send_rtp != null) {
-            plugin.pause();
-            debug("Link %s to %s send_rtp for %s", send_rtp_src_pad.name, media, name);
-            send_rtp_src_pad.link(send_rtp.get_static_pad("sink"));
-            plugin.unpause();
-        }
-    }
-
-    public void set_input(Gst.Element? input) {
-        set_input_and_pause(input, paused);
-    }
-
-    private void set_input_and_pause(Gst.Element? input, bool paused) {
-        if (created && this.input != null) {
-            this.input_pad.unlink(send_rtp_sink_pad);
-            this.input.release_request_pad(this.input_pad);
-            this.input_pad = null;
-            this.input = null;
-        }
-
-        this.input = input;
-        this.paused = paused;
-
-        if (created && sending && !paused && input != null) {
-            plugin.pause();
-            input_pad = input.get_request_pad(@"src_$rtpid");
-            input_pad.link(send_rtp_sink_pad);
-            plugin.unpause();
-        }
-    }
-
-    public void pause() {
-        if (paused) return;
-        var input = this.input;
-        set_input_and_pause(null, true);
-        if (input != null && input_device != null) input_device.unlink(input);
-    }
-
-    public void unpause() {
-        if (!paused) return;
-        set_input_and_pause(input_device != null ? input_device.link_source(payload_type, our_ssrc, next_seqnum_offset, next_timestamp_offset) : null, false);
-        input_device.update_bitrate(payload_type, target_send_bitrate);
-    }
-
-    public uint get_participant_ssrc(Xmpp.Jid participant) {
-        if (participant.equals(content.session.peer_full_jid)) {
-            return participant_ssrc;
-        }
-        return 0;
-    }
-
-    ulong block_probe_handler_id = 0;
-    public virtual void add_output(Gst.Element element, Xmpp.Jid? participant = null) {
-        if (output != null) {
-            critical("add_output() invoked more than once");
-            return;
-        }
-        if (participant != null) {
-            critical("add_output() invoked with participant when not supported");
-            return;
-        }
-        this.output = element;
-        if (created) {
-            plugin.pause();
-            decode.link(element);
-            if (block_probe_handler_id != 0) {
-                decode.get_static_pad("src").remove_probe(block_probe_handler_id);
-            }
-            plugin.unpause();
-        }
-    }
-
-    public virtual void remove_output(Gst.Element element) {
-        if (output != element) {
-            critical("remove_output() invoked without prior add_output()");
-            return;
-        }
-        if (created) {
-            block_probe_handler_id = decode.get_static_pad("src").add_probe(Gst.PadProbeType.BLOCK, drop_probe);
-            decode.unlink(element);
-        }
-        if (this._output_device != null) {
-            this._output_device.unlink(element);
-            this._output_device = null;
-        }
-        this.output = null;
-    }
-}
-
-public class Dino.Plugins.Rtp.VideoStream : Stream {
-    private Gee.List<Gst.Element> outputs = new ArrayList<Gst.Element>();
-    private Gst.Element output_tee;
-    private Gst.Element rotate;
-    private ulong incoming_video_orientation_changed_handler;
-
-    public VideoStream(Plugin plugin, Xmpp.Xep.Jingle.Content content) {
-        base(plugin, content);
-        if (media != "video") critical("VideoStream created for non-video media");
-    }
-
-    public override void create() {
-        incoming_video_orientation_changed_handler = incoming_video_orientation_changed.connect(on_video_orientation_changed);
-        plugin.pause();
-        rotate = Gst.ElementFactory.make("videoflip", @"video_rotate_$rtpid");
-        pipe.add(rotate);
-        output_tee = Gst.ElementFactory.make("tee", @"video_tee_$rtpid");
-        output_tee.@set("allow-not-linked", true);
-        pipe.add(output_tee);
-        rotate.link(output_tee);
-        add_output(rotate);
-        base.create();
-        foreach (Gst.Element output in outputs) {
-            output_tee.link(output);
-        }
-        plugin.unpause();
-    }
-
-    private void on_video_orientation_changed(uint16 degree) {
-        if (rotate != null) {
-            switch (degree) {
-                case 0:
-                    rotate.@set("method", 0);
-                    break;
-                case 90:
-                    rotate.@set("method", 1);
-                    break;
-                case 180:
-                    rotate.@set("method", 2);
-                    break;
-                case 270:
-                    rotate.@set("method", 3);
-                    break;
-            }
-        }
-    }
-
-    public override void destroy() {
-        foreach (Gst.Element output in outputs) {
-            output_tee.unlink(output);
-        }
-        base.destroy();
-        rotate.set_locked_state(true);
-        rotate.set_state(Gst.State.NULL);
-        rotate.unlink(output_tee);
-        pipe.remove(rotate);
-        rotate = null;
-        output_tee.set_locked_state(true);
-        output_tee.set_state(Gst.State.NULL);
-        pipe.remove(output_tee);
-        output_tee = null;
-        disconnect(incoming_video_orientation_changed_handler);
-    }
-
-    public override void add_output(Gst.Element element, Xmpp.Jid? participant) {
-        if (element == output_tee || element == rotate) {
-            base.add_output(element);
-            return;
-        }
-        outputs.add(element);
-        if (output_tee != null) {
-            output_tee.link(element);
-        }
-    }
-
-    public override void remove_output(Gst.Element element) {
-        if (element == output_tee || element == rotate) {
-            base.remove_output(element);
-            return;
-        }
-        outputs.remove(element);
-        if (output_tee != null) {
-            output_tee.unlink(element);
-        }
-    }
-}