aboutsummaryrefslogtreecommitdiff
path: root/plugins/rtp/src/stream.vala
blob: 25a1ed2c7852efbd825bc0e0531ce7548a050209 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
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 (!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) 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 = plugin.get_preferred_device(media, false);
        }
        if (receiving && output == null) {
            output_device = plugin.get_preferred_device(media, true);
        }
    }

    public override void create() {
        plugin.pause();

        // Create i/o if needed

        if (input == null && input_device == null && sending) {
            input_device = plugin.get_preferred_device(media, false);
        }
        if (output == null && output_device == null && receiving && media == "audio") {
            output_device = plugin.get_preferred_device(media, true);
        }

        // 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);
        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);
        }
    }

    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 (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);
            }
        }

        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);
        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);
        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_video_orientation_degree = uint16.MAX;
    public signal void 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();
            }
            debug("Received RTP %s buffer seq %u with SSRC %u", media, buffer_seq, buffer_ssrc);
        }
#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_video_orientation_degree) {
                                video_orientation_changed(rotation_degree);
                                previous_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 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() {
        video_orientation_changed_handler = 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(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);
        }
    }
}