aboutsummaryrefslogtreecommitdiff
path: root/src/main.cpp
blob: 8cd3632f4366f0b761473f62e4bb7049bb23bb64 (plain)
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
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
extern "C" {
#include "../include/capture/nvfbc.h"
#include "../include/capture/xcomposite_cuda.h"
#include "../include/capture/xcomposite_drm.h"
#include "../include/egl.h"
#include "../include/time.h"
}

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <vector>
#include <unordered_map>
#include <thread>
#include <mutex>
#include <map>
#include <signal.h>
#include <sys/stat.h>

#include <unistd.h>
#include <fcntl.h>

#include "../include/sound.hpp"

#include <X11/extensions/Xrandr.h>

extern "C" {
#include <libavutil/pixfmt.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavutil/opt.h>
#include <libswresample/swresample.h>
#include <libavutil/avutil.h>
#include <libavutil/time.h>
#include <libavfilter/avfilter.h>
#include <libavfilter/buffersink.h>
#include <libavfilter/buffersrc.h>
}

#include <deque>
#include <future>

typedef enum {
    GPU_VENDOR_AMD,
    GPU_VENDOR_INTEL,
    GPU_VENDOR_NVIDIA
} gpu_vendor;

// TODO: Remove LIBAVUTIL_VERSION_MAJOR checks in the future when ubuntu, pop os LTS etc update ffmpeg to >= 5.0

static const int VIDEO_STREAM_INDEX = 0;

static thread_local char av_error_buffer[AV_ERROR_MAX_STRING_SIZE];

static const XRRModeInfo* get_mode_info(const XRRScreenResources *sr, RRMode id) {
    for(int i = 0; i < sr->nmode; ++i) {
        if(sr->modes[i].id == id)
            return &sr->modes[i];
    }    
    return nullptr;
}

typedef void (*active_monitor_callback)(const XRROutputInfo *output_info, const XRRCrtcInfo *crt_info, const XRRModeInfo *mode_info, void *userdata);

static void for_each_active_monitor_output(Display *display, active_monitor_callback callback, void *userdata) {
    XRRScreenResources *screen_res = XRRGetScreenResources(display, DefaultRootWindow(display));
    if(!screen_res)
        return;

    for(int i = 0; i < screen_res->noutput; ++i) {
        XRROutputInfo *out_info = XRRGetOutputInfo(display, screen_res, screen_res->outputs[i]);
        if(out_info && out_info->crtc && out_info->connection == RR_Connected) {
            XRRCrtcInfo *crt_info = XRRGetCrtcInfo(display, screen_res, out_info->crtc);
            if(crt_info && crt_info->mode) {
                const XRRModeInfo *mode_info = get_mode_info(screen_res, crt_info->mode);
                if(mode_info)
                    callback(out_info, crt_info, mode_info, userdata);
            }
            if(crt_info)
                XRRFreeCrtcInfo(crt_info);
        }
        if(out_info)
            XRRFreeOutputInfo(out_info);
    }    

    XRRFreeScreenResources(screen_res);
}

typedef struct {
    vec2i pos;
    vec2i size;
} gsr_monitor;

typedef struct {
    const char *name;
    int name_len;
    gsr_monitor *monitor;
    bool found_monitor;
} get_monitor_by_name_userdata;

static void get_monitor_by_name_callback(const XRROutputInfo *output_info, const XRRCrtcInfo *crt_info, const XRRModeInfo *mode_info, void *userdata) {
    get_monitor_by_name_userdata *data = (get_monitor_by_name_userdata*)userdata;
    if(!data->found_monitor && data->name_len == output_info->nameLen && memcmp(data->name, output_info->name, data->name_len) == 0) {
        data->monitor->pos = { crt_info->x, crt_info->y };
        data->monitor->size = { (int)crt_info->width, (int)crt_info->height };
        data->found_monitor = true;
    }
}

static bool get_monitor_by_name(Display *display, const char *name, gsr_monitor *monitor) {
    get_monitor_by_name_userdata userdata;
    userdata.name = name;
    userdata.name_len = strlen(name);
    userdata.monitor = monitor;
    userdata.found_monitor = false;
    for_each_active_monitor_output(display, get_monitor_by_name_callback, &userdata);
    return userdata.found_monitor;
}

static void monitor_output_callback_print(const XRROutputInfo *output_info, const XRRCrtcInfo *crt_info, const XRRModeInfo *mode_info, void *userdata) {
    fprintf(stderr, "    \"%.*s\"    (%dx%d+%d+%d)\n", output_info->nameLen, output_info->name, (int)crt_info->width, (int)crt_info->height, crt_info->x, crt_info->y);
}

static char* av_error_to_string(int err) {
    if(av_strerror(err, av_error_buffer, sizeof(av_error_buffer)) < 0)
        strcpy(av_error_buffer, "Unknown error");
    return av_error_buffer;
}

enum class VideoQuality {
    MEDIUM,
    HIGH,
    VERY_HIGH,
    ULTRA
};

enum class VideoCodec {
    H264,
    H265
};

enum class AudioCodec {
    AAC,
    OPUS,
    FLAC
};

static int x11_error_handler(Display *dpy, XErrorEvent *ev) {
    return 0;
}

static int x11_io_error_handler(Display *dpy) {
    return 0;
}

// |stream| is only required for non-replay mode
static void receive_frames(AVCodecContext *av_codec_context, int stream_index, AVStream *stream, AVFrame *frame,
                           AVFormatContext *av_format_context,
                           double replay_start_time,
                           std::deque<AVPacket> &frame_data_queue,
                           int replay_buffer_size_secs,
                           bool &frames_erased,
						   std::mutex &write_output_mutex) {
    for (;;) {
        // TODO: Use av_packet_alloc instead because sizeof(av_packet) might not be future proof(?)
        AVPacket av_packet;
        memset(&av_packet, 0, sizeof(av_packet));
        av_packet.data = NULL;
        av_packet.size = 0;
        int res = avcodec_receive_packet(av_codec_context, &av_packet);
        if (res == 0) { // we have a packet, send the packet to the muxer
            av_packet.stream_index = stream_index;
            av_packet.pts = av_packet.dts = frame->pts;

            if(frame->flags & AV_FRAME_FLAG_DISCARD)
                av_packet.flags |= AV_PKT_FLAG_DISCARD;

            std::lock_guard<std::mutex> lock(write_output_mutex);
            if(replay_buffer_size_secs != -1) {
                double time_now = clock_get_monotonic_seconds();
                double replay_time_elapsed = time_now - replay_start_time;

                AVPacket new_pack;
                av_packet_move_ref(&new_pack, &av_packet);
                frame_data_queue.push_back(std::move(new_pack));
                if(replay_time_elapsed >= replay_buffer_size_secs) {
                    av_packet_unref(&frame_data_queue.front());
                    frame_data_queue.pop_front();
                    frames_erased = true;
                }
                av_packet_unref(&av_packet);
            } else {
                av_packet_rescale_ts(&av_packet, av_codec_context->time_base, stream->time_base);
                av_packet.stream_index = stream->index;
                // TODO: Is av_interleaved_write_frame needed?
                int ret = av_interleaved_write_frame(av_format_context, &av_packet);
                if(ret < 0) {
                    fprintf(stderr, "Error: Failed to write frame index %d to muxer, reason: %s (%d)\n", av_packet.stream_index, av_error_to_string(ret), ret);
                }
            }
        } else if (res == AVERROR(EAGAIN)) { // we have no packet
                                             // fprintf(stderr, "No packet!\n");
            av_packet_unref(&av_packet);
            break;
        } else if (res == AVERROR_EOF) { // this is the end of the stream
            fprintf(stderr, "End of stream!\n");
            av_packet_unref(&av_packet);
            break;
        } else {
            fprintf(stderr, "Unexpected error: %d\n", res);
            av_packet_unref(&av_packet);
            break;
        }
    }
}

static const char* audio_codec_get_name(AudioCodec audio_codec) {
    switch(audio_codec) {
        case AudioCodec::AAC:  return "aac";
        case AudioCodec::OPUS: return "opus";
        case AudioCodec::FLAC: return "flac";
    }
    assert(false);
    return "";
}

static AVCodecID audio_codec_get_id(AudioCodec audio_codec) {
    switch(audio_codec) {
        case AudioCodec::AAC:  return AV_CODEC_ID_AAC;
        case AudioCodec::OPUS: return AV_CODEC_ID_OPUS;
        case AudioCodec::FLAC: return AV_CODEC_ID_FLAC;
    }
    assert(false);
    return AV_CODEC_ID_AAC;
}

static AVSampleFormat audio_codec_get_sample_format(AudioCodec audio_codec) {
    switch(audio_codec) {
        case AudioCodec::AAC:  return AV_SAMPLE_FMT_FLTP;
        case AudioCodec::OPUS: return AV_SAMPLE_FMT_S16;
        case AudioCodec::FLAC: return AV_SAMPLE_FMT_S32;
    }
    assert(false);
    return AV_SAMPLE_FMT_FLTP;
}

static int64_t audio_codec_get_get_bitrate(AudioCodec audio_codec) {
    switch(audio_codec) {
        case AudioCodec::AAC:  return 128000;
        case AudioCodec::OPUS: return 96000;
        case AudioCodec::FLAC: return 96000;
    }
    assert(false);
    return 96000;
}

static AudioFormat audio_codec_get_audio_format(AudioCodec audio_codec) {
    switch(audio_codec) {
        case AudioCodec::AAC:  return S32;
        case AudioCodec::OPUS: return S16;
        case AudioCodec::FLAC: return S32;
    }
    assert(false);
    return S32;
}

static AVSampleFormat audio_format_to_sample_format(const AudioFormat audio_format) {
    switch(audio_format) {
        case S16:   return AV_SAMPLE_FMT_S16;
        case S32:   return AV_SAMPLE_FMT_S32;
    }
    assert(false);
    return AV_SAMPLE_FMT_S16;
}

static AVCodecContext* create_audio_codec_context(int fps, AudioCodec audio_codec) {
    const AVCodec *codec = avcodec_find_encoder(audio_codec_get_id(audio_codec));
    if (!codec) {
        fprintf(stderr, "Error: Could not find %s audio encoder\n", audio_codec_get_name(audio_codec));
        exit(1);
    }

    AVCodecContext *codec_context = avcodec_alloc_context3(codec);

    assert(codec->type == AVMEDIA_TYPE_AUDIO);
	codec_context->codec_id = codec->id;
    codec_context->sample_fmt = audio_codec_get_sample_format(audio_codec);
    codec_context->bit_rate = audio_codec_get_get_bitrate(audio_codec);
    codec_context->sample_rate = 48000;
    if(audio_codec == AudioCodec::AAC)
        codec_context->profile = FF_PROFILE_AAC_LOW;
#if LIBAVCODEC_VERSION_MAJOR < 60
    codec_context->channel_layout = AV_CH_LAYOUT_STEREO;
    codec_context->channels = 2;
#else
    av_channel_layout_default(&codec_context->ch_layout, 2);
#endif

    codec_context->time_base.num = 1;
    codec_context->time_base.den = codec_context->sample_rate;
    codec_context->framerate.num = fps;
    codec_context->framerate.den = 1;
    codec_context->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;

    return codec_context;
}

static AVCodecContext *create_video_codec_context(AVPixelFormat pix_fmt,
                            VideoQuality video_quality,
                            int fps, const AVCodec *codec, bool is_livestream) {

    AVCodecContext *codec_context = avcodec_alloc_context3(codec);

    //double fps_ratio = (double)fps / 30.0;

    assert(codec->type == AVMEDIA_TYPE_VIDEO);
    codec_context->codec_id = codec->id;
    // Timebase: This is the fundamental unit of time (in seconds) in terms
    // of which frame timestamps are represented. For fixed-fps content,
    // timebase should be 1/framerate and timestamp increments should be
    // identical to 1
    codec_context->time_base.num = 1;
    codec_context->time_base.den = fps;
    codec_context->framerate.num = fps;
    codec_context->framerate.den = 1;
    codec_context->sample_aspect_ratio.num = 0;
    codec_context->sample_aspect_ratio.den = 0;
    // High values reeduce file size but increases time it takes to seek
    if(is_livestream) {
        codec_context->flags |= (AV_CODEC_FLAG_CLOSED_GOP | AV_CODEC_FLAG_LOW_DELAY);
        codec_context->flags2 |= AV_CODEC_FLAG2_FAST;
        //codec_context->gop_size = std::numeric_limits<int>::max();
        //codec_context->keyint_min = std::numeric_limits<int>::max();
        codec_context->gop_size = fps * 2;
    } else {
        codec_context->gop_size = fps * 2;
    }
    codec_context->max_b_frames = 0;
    codec_context->pix_fmt = pix_fmt;
    codec_context->color_range = AVCOL_RANGE_JPEG;
    if(codec->id == AV_CODEC_ID_HEVC)
        codec_context->codec_tag = MKTAG('h', 'v', 'c', '1');
    switch(video_quality) {
        case VideoQuality::MEDIUM:
            //codec_context->qmin = 35;
            //codec_context->qmax = 35;
            codec_context->bit_rate = 100000;//4500000 + (codec_context->width * codec_context->height)*0.75;
            break;
        case VideoQuality::HIGH:
            //codec_context->qmin = 34;
            //codec_context->qmax = 34;
            codec_context->bit_rate = 100000;//10000000-9000000 + (codec_context->width * codec_context->height)*0.75;
            break;
        case VideoQuality::VERY_HIGH:
            //codec_context->qmin = 28;
            //codec_context->qmax = 28;
            codec_context->bit_rate = 100000;//10000000-9000000 + (codec_context->width * codec_context->height)*0.75;
            break;
        case VideoQuality::ULTRA:
            //codec_context->qmin = 22;
            //codec_context->qmax = 22;
            codec_context->bit_rate = 100000;//10000000-9000000 + (codec_context->width * codec_context->height)*0.75;
            break;
    }
    //codec_context->profile = FF_PROFILE_H264_MAIN;
    if (codec_context->codec_id == AV_CODEC_ID_MPEG1VIDEO)
        codec_context->mb_decision = 2;

    // stream->time_base = codec_context->time_base;
    // codec_context->ticks_per_frame = 30;
    //av_opt_set(codec_context->priv_data, "tune", "hq", 0);
    // TODO: Do this for better file size? also allows setting qmin, qmax per frame? which can then be used to dynamically set bitrate to reduce quality
    // if live streaming is slow or if the users harddrive is cant handle writing megabytes of data per second.
    #if 0
    char qmin_str[32];
    snprintf(qmin_str, sizeof(qmin_str), "%d", codec_context->qmin);

    char qmax_str[32];
    snprintf(qmax_str, sizeof(qmax_str), "%d", codec_context->qmax);

    av_opt_set(codec_context->priv_data, "cq", qmax_str, 0);
    av_opt_set(codec_context->priv_data, "rc", "vbr", 0);
    av_opt_set(codec_context->priv_data, "qmin", qmin_str, 0);
    av_opt_set(codec_context->priv_data, "qmax", qmax_str, 0);
    codec_context->bit_rate = 0;
    #endif

    //codec_context->rc_max_rate = codec_context->bit_rate;
    //codec_context->rc_min_rate = codec_context->bit_rate;
    //codec_context->rc_buffer_size = codec_context->bit_rate / 10;

    codec_context->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;

    return codec_context;
}

static bool check_if_codec_valid_for_hardware(const AVCodec *codec) {
    bool success = false;
    // Do not use AV_PIX_FMT_CUDA because we dont want to do full check with hardware context
    AVCodecContext *codec_context = create_video_codec_context(AV_PIX_FMT_YUV420P, VideoQuality::VERY_HIGH, 60, codec, false);
    codec_context->width = 1920;
    codec_context->height = 1080;
    if(codec_context) {
        success = avcodec_open2(codec_context, codec_context->codec, NULL) == 0;
        avcodec_free_context(&codec_context);
    }
    return success;
}

static const AVCodec* find_h264_encoder(gpu_vendor vendor) {
    const AVCodec *codec = avcodec_find_encoder_by_name(vendor == GPU_VENDOR_NVIDIA ? "h264_nvenc" : "h264_vaapi");
    if(!codec)
        codec = avcodec_find_encoder_by_name(vendor == GPU_VENDOR_NVIDIA ? "nvenc_h264" : "vaapi_h264");

    static bool checked = false;
    static bool checked_success = true;
    if(!checked) {
        checked = true;
        if(!check_if_codec_valid_for_hardware(codec))
            checked_success = false;
    }
    return checked_success ? codec : nullptr;
}

// TODO: Disable under intel/amd?

static const AVCodec* find_h265_encoder(gpu_vendor vendor) {
    const AVCodec *codec = avcodec_find_encoder_by_name(vendor == GPU_VENDOR_NVIDIA ? "hevc_nvenc" : "hevc_vaapi");
    if(!codec)
        codec = avcodec_find_encoder_by_name(vendor == GPU_VENDOR_NVIDIA ? "nvenc_hevc" : "vaapi_hevc");

    if(!codec)
        return nullptr;

    static bool checked = false;
    static bool checked_success = true;
    if(!checked) {
        checked = true;
        if(!check_if_codec_valid_for_hardware(codec))
            checked_success = false;
    }
    return checked_success ? codec : nullptr;
}

static AVFrame* open_audio(AVCodecContext *audio_codec_context) {
    AVDictionary *options = nullptr;
    av_dict_set(&options, "strict", "experimental", 0);

    int ret;
    ret = avcodec_open2(audio_codec_context, audio_codec_context->codec, &options);
    if(ret < 0) {
        fprintf(stderr, "failed to open codec, reason: %s\n", av_error_to_string(ret));
        exit(1);
    }

    AVFrame *frame = av_frame_alloc();
    if(!frame) {
        fprintf(stderr, "failed to allocate audio frame\n");
        exit(1);
    }

    frame->sample_rate = audio_codec_context->sample_rate;
    frame->nb_samples = audio_codec_context->frame_size;
    frame->format = audio_codec_context->sample_fmt;
#if LIBAVCODEC_VERSION_MAJOR < 60
    frame->channels = audio_codec_context->channels;
    frame->channel_layout = audio_codec_context->channel_layout;
#else
    av_channel_layout_copy(&frame->ch_layout, &audio_codec_context->ch_layout);
#endif

    ret = av_frame_get_buffer(frame, 0);
    if(ret < 0) {
        fprintf(stderr, "failed to allocate audio data buffers, reason: %s\n", av_error_to_string(ret));
        exit(1);
    }

    return frame;
}

static void open_video(AVCodecContext *codec_context, VideoQuality video_quality, bool very_old_gpu) {
    bool supports_p4 = false;
    bool supports_p6 = false;

    const AVOption *opt = nullptr;
    while((opt = av_opt_next(codec_context->priv_data, opt))) {
        if(opt->type == AV_OPT_TYPE_CONST) {
            if(strcmp(opt->name, "p4") == 0)
                supports_p4 = true;
            else if(strcmp(opt->name, "p6") == 0)
                supports_p6 = true;
        }
    }

    AVDictionary *options = nullptr;
    if(very_old_gpu) {
        switch(video_quality) {
            case VideoQuality::MEDIUM:
                av_dict_set_int(&options, "qp", 37, 0);
                break;
            case VideoQuality::HIGH:
                av_dict_set_int(&options, "qp", 32, 0);
                break;
            case VideoQuality::VERY_HIGH:
                av_dict_set_int(&options, "qp", 27, 0);
                break;
            case VideoQuality::ULTRA:
                av_dict_set_int(&options, "qp", 21, 0);
                break;
        }
    } else {
        switch(video_quality) {
            case VideoQuality::MEDIUM:
                av_dict_set_int(&options, "qp", 40, 0);
                break;
            case VideoQuality::HIGH:
                av_dict_set_int(&options, "qp", 35, 0);
                break;
            case VideoQuality::VERY_HIGH:
                av_dict_set_int(&options, "qp", 30, 0);
                break;
            case VideoQuality::ULTRA:
                av_dict_set_int(&options, "qp", 24, 0);
                break;
        }
    }

    if(!supports_p4 && !supports_p6)
        fprintf(stderr, "Info: your ffmpeg version is outdated. It's recommended that you use the flatpak version of gpu-screen-recorder version instead, which you can find at https://flathub.org/apps/details/com.dec05eba.gpu_screen_recorder\n");

    //if(is_livestream) {
    //    av_dict_set_int(&options, "zerolatency", 1, 0);
    //    //av_dict_set(&options, "preset", "llhq", 0);
    //}

    // Fuck nvidia and ffmpeg, I want to use a good preset for the gpu but all gpus prefer different
    // presets. Nvidia and ffmpeg used to support "hq" preset that chose the best preset for the gpu
    // with pretty good performance but you now have to choose p1-p7, which are gpu agnostic and on
    // older gpus p5-p7 slow the gpu down to a crawl...
    // "hq" is now just an alias for p7 in ffmpeg :(
    // TODO: Temporary disable because of stuttering?
    if(very_old_gpu)
        av_dict_set(&options, "preset", supports_p4 ? "p4" : "medium", 0);
    else
        av_dict_set(&options, "preset", supports_p6 ? "p6" : "slow", 0);

    av_dict_set(&options, "tune", "hq", 0);
    av_dict_set(&options, "rc", "constqp", 0);

    if(codec_context->codec_id == AV_CODEC_ID_H264)
        av_dict_set(&options, "profile", "high", 0);

    av_dict_set(&options, "strict", "experimental", 0);

    int ret = avcodec_open2(codec_context, codec_context->codec, &options);
    if (ret < 0) {
        fprintf(stderr, "Error: Could not open video codec: %s\n", av_error_to_string(ret));
        exit(1);
    }
}

static void usage() {
    fprintf(stderr, "usage: gpu-screen-recorder -w <window_id|monitor|focused> [-c <container_format>] [-s WxH] -f <fps> [-a <audio_input>...] [-q <quality>] [-r <replay_buffer_size_sec>] [-k h264|h265] [-ac aac|opus|flac] [-o <output_file>]\n");
    fprintf(stderr, "OPTIONS:\n");
    fprintf(stderr, "  -w    Window to record, a display, \"screen\", \"screen-direct\", \"screen-direct-force\" or \"focused\". The display is the display (monitor) name in xrandr and if \"screen\" or \"screen-direct\" is selected then all displays are recorded. If this is \"focused\" then the currently focused window is recorded. When recording the focused window then the -s option has to be used as well.\n"
        "        \"screen-direct\"/\"screen-direct-force\" skips one texture copy for fullscreen applications so it may lead to better performance and it works with VRR monitors when recording fullscreen application but may break some applications, such as mpv in fullscreen mode. Direct mode doesn't capture cursor either. \"screen-direct-force\" is not recommended unless you use a VRR monitor because there might be driver issues that cause the video to stutter or record a black screen.\n");
    fprintf(stderr, "  -c    Container format for output file, for example mp4, or flv. Only required if no output file is specified or if recording in replay buffer mode. If an output file is specified and -c is not used then the container format is determined from the output filename extension.\n");
    fprintf(stderr, "  -s    The size (area) to record at in the format WxH, for example 1920x1080. This option is only supported (and required) when -w is \"focused\".\n");
    fprintf(stderr, "  -f    Framerate to record at.\n");
    fprintf(stderr, "  -a    Audio device to record from (pulse audio device). Can be specified multiple times. Each time this is specified a new audio track is added for the specified audio device. A name can be given to the audio input device by prefixing the audio input with <name>/, for example \"dummy/alsa_output.pci-0000_00_1b.0.analog-stereo.monitor\". Multiple audio devices can be merged into one audio track by using \"|\" as a separator into one -a argument, for example: -a \"alsa_output1|alsa_output2\". Optional, no audio track is added by default.\n");
    fprintf(stderr, "  -q    Video quality. Should be either 'medium', 'high', 'very_high' or 'ultra'. 'high' is the recommended option when live streaming or when you have a slower harddrive. Optional, set to 'very_high' be default.\n");
    fprintf(stderr, "  -r    Replay buffer size in seconds. If this is set, then only the last seconds as set by this option will be stored"
        " and the video will only be saved when the gpu-screen-recorder is closed. This feature is similar to Nvidia's instant replay feature."
        " This option has be between 5 and 1200. Note that the replay buffer size will not always be precise, because of keyframes. Optional, disabled by default.\n");
    fprintf(stderr, "  -k    Video codec to use. Should be either 'auto', 'h264' or 'h265'. Defaults to 'auto' which defaults to 'h265' unless recording at a higher resolution than 3840x2160. Forcefully set to 'h264' if -c is 'flv'.\n");
    fprintf(stderr, "  -ac   Audio codec to use. Should be either 'aac', 'opus' or 'flac'. Defaults to 'opus' for .mp4/.mkv files, otherwise defaults to 'aac'. 'opus' and 'flac' is only supported by .mp4/.mkv files. 'opus' is recommended for best performance and smallest audio size.\n");
    fprintf(stderr, "  -o    The output file path. If omitted then the encoded data is sent to stdout. Required in replay mode (when using -r). In replay mode this has to be an existing directory instead of a file.\n");
    fprintf(stderr, "NOTES:\n");
    fprintf(stderr, "  Send signal SIGINT (Ctrl+C) to gpu-screen-recorder to stop and save the recording (when not using replay mode).\n");
    fprintf(stderr, "  Send signal SIGUSR1 (killall -SIGUSR1 gpu-screen-recorder) to gpu-screen-recorder to save a replay.\n");
    fprintf(stderr, "EXAMPLES\n");
    fprintf(stderr, "  gpu-screen-recorder -w screen -f 60 -a \"$(pactl get-default-sink).monitor\" -o video.mp4\n");
    exit(1);
}

static sig_atomic_t running = 1;
static sig_atomic_t save_replay = 0;

static void int_handler(int) {
    running = 0;
}

static void save_replay_handler(int) {
    save_replay = 1;
}

struct Arg {
    std::vector<const char*> values;
    bool optional = false;
    bool list = false;

    const char* value() const {
        if(values.empty())
            return nullptr;
        return values.front();
    }
};

static bool is_hex_num(char c) {
    return (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f') || (c >= '0' && c <= '9');
}

static bool contains_non_hex_number(const char *str) {
    size_t len = strlen(str);
    if(len >= 2 && memcmp(str, "0x", 2) == 0) {
        str += 2;
        len -= 2;
    }

    for(size_t i = 0; i < len; ++i) {
        char c = str[i];
        if(c == '\0')
            return false;
        if(!is_hex_num(c))
            return true;
    }
    return false;
}

static std::string get_date_str() {
    char str[128];
    time_t now = time(NULL);
    struct tm *t = localtime(&now);
    strftime(str, sizeof(str)-1, "%Y-%m-%d_%H-%M-%S", t);
    return str; 
}

static AVStream* create_stream(AVFormatContext *av_format_context, AVCodecContext *codec_context) {
    AVStream *stream = avformat_new_stream(av_format_context, nullptr);
    if (!stream) {
        fprintf(stderr, "Error: Could not allocate stream\n");
        exit(1);
    }
    stream->id = av_format_context->nb_streams - 1;
    stream->time_base = codec_context->time_base;
    stream->avg_frame_rate = codec_context->framerate;
    return stream;
}

struct AudioDevice {
    SoundDevice sound_device;
    AudioInput audio_input;
    AVFilterContext *src_filter_ctx = nullptr;
    std::thread thread; // TODO: Instead of having a thread for each track, have one thread for all threads and read the data with non-blocking read
};

struct AudioTrack {
    AVCodecContext *codec_context = nullptr;
    AVFrame *frame = nullptr;
    AVStream *stream = nullptr;

    std::vector<AudioDevice> audio_devices;
    AVFilterGraph *graph = nullptr;
    AVFilterContext *sink = nullptr;
    int64_t pts = 0;
    int stream_index = 0;
};

static std::future<void> save_replay_thread;
static std::vector<AVPacket> save_replay_packets;
static std::string save_replay_output_filepath;

static void save_replay_async(AVCodecContext *video_codec_context, int video_stream_index, std::vector<AudioTrack> &audio_tracks, const std::deque<AVPacket> &frame_data_queue, bool frames_erased, std::string output_dir, const char *container_format, const std::string &file_extension, std::mutex &write_output_mutex) {
    if(save_replay_thread.valid())
        return;
    
    size_t start_index = (size_t)-1;
    int64_t video_pts_offset = 0;
    int64_t audio_pts_offset = 0;

    {
        std::lock_guard<std::mutex> lock(write_output_mutex);
        start_index = (size_t)-1;
        for(size_t i = 0; i < frame_data_queue.size(); ++i) {
            const AVPacket &av_packet = frame_data_queue[i];
            if((av_packet.flags & AV_PKT_FLAG_KEY) && av_packet.stream_index == video_stream_index) {
                start_index = i;
                break;
            }
        }

        if(start_index == (size_t)-1)
            return;

        if(frames_erased) {
            video_pts_offset = frame_data_queue[start_index].pts;
            
            // Find the next audio packet to use as audio pts offset
            for(size_t i = start_index; i < frame_data_queue.size(); ++i) {
                const AVPacket &av_packet = frame_data_queue[i];
                if(av_packet.stream_index != video_stream_index) {
                    audio_pts_offset = av_packet.pts;
                    break;
                }
            }
        } else {
            start_index = 0;
        }

        save_replay_packets.resize(frame_data_queue.size());
        for(size_t i = 0; i < frame_data_queue.size(); ++i) {
            av_packet_ref(&save_replay_packets[i], &frame_data_queue[i]);
        }
    }

    save_replay_output_filepath = output_dir + "/Replay_" + get_date_str() + "." + file_extension;
    save_replay_thread = std::async(std::launch::async, [video_stream_index, container_format, start_index, video_pts_offset, audio_pts_offset, video_codec_context, &audio_tracks]() mutable {
        AVFormatContext *av_format_context;
        avformat_alloc_output_context2(&av_format_context, nullptr, container_format, nullptr);

        av_format_context->flags |= AVFMT_FLAG_GENPTS;
        av_format_context->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;

        AVStream *video_stream = create_stream(av_format_context, video_codec_context);
        avcodec_parameters_from_context(video_stream->codecpar, video_codec_context);

        std::unordered_map<int, AudioTrack*> stream_index_to_audio_track_map;
        for(AudioTrack &audio_track : audio_tracks) {
            stream_index_to_audio_track_map[audio_track.stream_index] = &audio_track;
            AVStream *audio_stream = create_stream(av_format_context, audio_track.codec_context);
            avcodec_parameters_from_context(audio_stream->codecpar, audio_track.codec_context);
            audio_track.stream = audio_stream;
        }

        int ret = avio_open(&av_format_context->pb, save_replay_output_filepath.c_str(), AVIO_FLAG_WRITE);
        if (ret < 0) {
            fprintf(stderr, "Error: Could not open '%s': %s. Make sure %s is an existing directory with write access\n", save_replay_output_filepath.c_str(), av_error_to_string(ret), save_replay_output_filepath.c_str());
            return;
        }

        AVDictionary *options = nullptr;
        av_dict_set(&options, "strict", "experimental", 0);

        ret = avformat_write_header(av_format_context, &options);
        if (ret < 0) {
            fprintf(stderr, "Error occurred when writing header to output file: %s\n", av_error_to_string(ret));
            return;
        }

        for(size_t i = start_index; i < save_replay_packets.size(); ++i) {
            AVPacket &av_packet = save_replay_packets[i];

            AVStream *stream = video_stream;
            AVCodecContext *codec_context = video_codec_context;

            if(av_packet.stream_index == video_stream_index) {
                av_packet.pts -= video_pts_offset;
                av_packet.dts -= video_pts_offset;
            } else {
                AudioTrack *audio_track = stream_index_to_audio_track_map[av_packet.stream_index];
                stream = audio_track->stream;
                codec_context = audio_track->codec_context;

                av_packet.pts -= audio_pts_offset;
                av_packet.dts -= audio_pts_offset;
            }

            av_packet.stream_index = stream->index;
            av_packet_rescale_ts(&av_packet, codec_context->time_base, stream->time_base);

            int ret = av_interleaved_write_frame(av_format_context, &av_packet);
            if(ret < 0)
                fprintf(stderr, "Error: Failed to write frame index %d to muxer, reason: %s (%d)\n", stream->index, av_error_to_string(ret), ret);
        }

        if (av_write_trailer(av_format_context) != 0)
            fprintf(stderr, "Failed to write trailer\n");

        avio_close(av_format_context->pb);
        avformat_free_context(av_format_context);
        av_dict_free(&options);

        for(AudioTrack &audio_track : audio_tracks) {
            audio_track.stream = nullptr;
        }
    });
}

static void split_string(const std::string &str, char delimiter, std::function<bool(const char*,size_t)> callback) {
    size_t index = 0;
    while(index < str.size()) {
        size_t end_index = str.find(delimiter, index);
        if(end_index == std::string::npos)
            end_index = str.size();

        if(!callback(&str[index], end_index - index))
            break;

        index = end_index + 1;
    }
}

static std::vector<AudioInput> parse_audio_input_arg(const char *str) {
    std::vector<AudioInput> audio_inputs;
    split_string(str, '|', [&audio_inputs](const char *sub, size_t size) {
        AudioInput audio_input;
        audio_input.name.assign(sub, size);
        const size_t index = audio_input.name.find('/');
        if(index != std::string::npos) {
            audio_input.description = audio_input.name.substr(0, index);
            audio_input.name.erase(audio_input.name.begin(), audio_input.name.begin() + index + 1);
        }
        audio_inputs.push_back(std::move(audio_input));
        return true;
    });
    return audio_inputs;
}

// TODO: Does this match all livestreaming cases?
static bool is_livestream_path(const char *str) {
    const int len = strlen(str);
    if((len >= 7 && memcmp(str, "http://", 7) == 0) || (len >= 8 && memcmp(str, "https://", 8) == 0))
        return true;
    else if((len >= 7 && memcmp(str, "rtmp://", 7) == 0) || (len >= 8 && memcmp(str, "rtmps://", 8) == 0))
        return true;
    else
        return false;
}

typedef struct {
    gpu_vendor vendor;
    int gpu_version; /* 0 if unknown */
} gpu_info;

static bool gl_get_gpu_info(Display *dpy, gpu_info *info) {
    gsr_egl gl;
    if(!gsr_egl_load(&gl, dpy)) {
        fprintf(stderr, "Error: failed to load opengl\n");
        return false;
    }

    bool supported = true;
    const unsigned char *gl_vendor = gl.glGetString(GL_VENDOR);
    const unsigned char *gl_renderer = gl.glGetString(GL_RENDERER);

    info->gpu_version = 0;

    if(!gl_vendor) {
        fprintf(stderr, "Error: failed to get gpu vendor\n");
        supported = false;
        goto end;
    }

    if(strstr((const char*)gl_vendor, "AMD"))
        info->vendor = GPU_VENDOR_AMD;
    else if(strstr((const char*)gl_vendor, "Intel"))
        info->vendor = GPU_VENDOR_INTEL;
    else if(strstr((const char*)gl_vendor, "NVIDIA"))
        info->vendor = GPU_VENDOR_NVIDIA;
    else {
        fprintf(stderr, "Error: unknown gpu vendor: %s\n", gl_vendor);
        supported = false;
        goto end;
    }

    if(gl_renderer) {
        if(info->vendor == GPU_VENDOR_NVIDIA)
            sscanf((const char*)gl_renderer, "%*s %*s %*s %d", &info->gpu_version);
    }

    end:
    gsr_egl_unload(&gl);
    return supported;
}

// TODO: Proper cleanup
static int init_filter_graph(AVCodecContext *audio_codec_context, AVFilterGraph **graph, AVFilterContext **sink, std::vector<AVFilterContext*> &src_filter_ctx, size_t num_sources)
{
    char ch_layout[64];
    int err = 0;
 
    AVFilterGraph *filter_graph = avfilter_graph_alloc();
    if (!filter_graph) {
        fprintf(stderr, "Unable to create filter graph.\n");
        return AVERROR(ENOMEM);
    }
 
    for(size_t i = 0; i < num_sources; ++i) {
        const AVFilter *abuffer = avfilter_get_by_name("abuffer");
        if (!abuffer) {
            fprintf(stderr, "Could not find the abuffer filter.\n");
            return AVERROR_FILTER_NOT_FOUND;
        }
    
        AVFilterContext *abuffer_ctx = avfilter_graph_alloc_filter(filter_graph, abuffer, NULL);
        if (!abuffer_ctx) {
            fprintf(stderr, "Could not allocate the abuffer instance.\n");
            return AVERROR(ENOMEM);
        }
    
        #if LIBAVCODEC_VERSION_MAJOR < 60
        av_get_channel_layout_string(ch_layout, sizeof(ch_layout), 0, AV_CH_LAYOUT_STEREO);
        #else
        av_channel_layout_describe(&audio_codec_context->ch_layout, ch_layout, sizeof(ch_layout));
        #endif
        av_opt_set    (abuffer_ctx, "channel_layout", ch_layout,                            AV_OPT_SEARCH_CHILDREN);
        av_opt_set    (abuffer_ctx, "sample_fmt",     av_get_sample_fmt_name(audio_codec_context->sample_fmt), AV_OPT_SEARCH_CHILDREN);
        av_opt_set_q  (abuffer_ctx, "time_base",      { 1, audio_codec_context->sample_rate },  AV_OPT_SEARCH_CHILDREN);
        av_opt_set_int(abuffer_ctx, "sample_rate",    audio_codec_context->sample_rate,                     AV_OPT_SEARCH_CHILDREN);
    
        err = avfilter_init_str(abuffer_ctx, NULL);
        if (err < 0) {
            fprintf(stderr, "Could not initialize the abuffer filter.\n");
            return err;
        }

        src_filter_ctx.push_back(abuffer_ctx);
    }

    const AVFilter *mix_filter = avfilter_get_by_name("amix");
    if (!mix_filter) {
        av_log(NULL, AV_LOG_ERROR, "Could not find the mix filter.\n");
        return AVERROR_FILTER_NOT_FOUND;
    }
    
    char args[512];
    snprintf(args, sizeof(args), "inputs=%d", (int)num_sources);
	
    AVFilterContext *mix_ctx;
	err = avfilter_graph_create_filter(&mix_ctx, mix_filter, "amix",
                                       args, NULL, filter_graph);

    if (err < 0) {
        av_log(NULL, AV_LOG_ERROR, "Cannot create audio amix filter\n");
        return err;
    }
 
    const AVFilter *abuffersink = avfilter_get_by_name("abuffersink");
    if (!abuffersink) {
        fprintf(stderr, "Could not find the abuffersink filter.\n");
        return AVERROR_FILTER_NOT_FOUND;
    }
 
    AVFilterContext *abuffersink_ctx = avfilter_graph_alloc_filter(filter_graph, abuffersink, "sink");
    if (!abuffersink_ctx) {
        fprintf(stderr, "Could not allocate the abuffersink instance.\n");
        return AVERROR(ENOMEM);
    }
 
    err = avfilter_init_str(abuffersink_ctx, NULL);
    if (err < 0) {
        fprintf(stderr, "Could not initialize the abuffersink instance.\n");
        return err;
    }
 
    err = 0;
    for(size_t i = 0; i < src_filter_ctx.size(); ++i) {
        AVFilterContext *src_ctx = src_filter_ctx[i];
        if (err >= 0)
            err = avfilter_link(src_ctx, 0, mix_ctx, i);
    }
    if (err >= 0)
        err = avfilter_link(mix_ctx, 0, abuffersink_ctx, 0);
    if (err < 0) {
        av_log(NULL, AV_LOG_ERROR, "Error connecting filters\n");
        return err;
    }
 
    err = avfilter_graph_config(filter_graph, NULL);
    if (err < 0) {
        av_log(NULL, AV_LOG_ERROR, "Error configuring the filter graph\n");
        return err;
    }
 
    *graph = filter_graph;
    *sink  = abuffersink_ctx;
 
    return 0;
}

int main(int argc, char **argv) {
    signal(SIGINT, int_handler);
    signal(SIGUSR1, save_replay_handler);

    //av_log_set_level(AV_LOG_TRACE);

    std::map<std::string, Arg> args = {
        { "-w", Arg { {}, false, false } },
        { "-c", Arg { {}, true, false } },
        { "-f", Arg { {}, false, false } },
        { "-s", Arg { {}, true, false } },
        { "-a", Arg { {}, true, true } },
        { "-q", Arg { {}, true, false } },
        { "-o", Arg { {}, true, false } },
        { "-r", Arg { {}, true, false } },
        { "-k", Arg { {}, true, false } },
        { "-ac", Arg { {}, true, false } }
    };

    for(int i = 1; i < argc - 1; i += 2) {
        auto it = args.find(argv[i]);
        if(it == args.end()) {
            fprintf(stderr, "Invalid argument '%s'\n", argv[i]);
            usage();
        }

        if(!it->second.values.empty() && !it->second.list) {
            fprintf(stderr, "Expected argument '%s' to only be specified once\n", argv[i]);
            usage();
        }

        it->second.values.push_back(argv[i + 1]);
    }

    for(auto &it : args) {
        if(!it.second.optional && !it.second.value()) {
            fprintf(stderr, "Missing argument '%s'\n", it.first.c_str());
            usage();
        }
    }

    VideoCodec video_codec = VideoCodec::H265;
    const char *video_codec_to_use = args["-k"].value();
    if(!video_codec_to_use)
        video_codec_to_use = "auto";

    if(strcmp(video_codec_to_use, "h264") == 0) {
        video_codec = VideoCodec::H264;
    } else if(strcmp(video_codec_to_use, "h265") == 0) {
        video_codec = VideoCodec::H265;
    } else if(strcmp(video_codec_to_use, "auto") != 0) {
        fprintf(stderr, "Error: -k should either be either 'auto', 'h264' or 'h265', got: '%s'\n", video_codec_to_use);
        usage();
    }

    AudioCodec audio_codec = AudioCodec::AAC;
    const char *audio_codec_to_use = args["-ac"].value();
    if(!audio_codec_to_use)
        audio_codec_to_use = "opus";

    if(strcmp(audio_codec_to_use, "aac") == 0) {
        audio_codec = AudioCodec::AAC;
    } else if(strcmp(audio_codec_to_use, "opus") == 0) {
        audio_codec = AudioCodec::OPUS;
    } else if(strcmp(audio_codec_to_use, "flac") == 0) {
        audio_codec = AudioCodec::FLAC;
    } else {
        fprintf(stderr, "Error: -ac should either be either 'aac', 'opus' or 'flac', got: '%s'\n", audio_codec_to_use);
        usage();
    }

    const AudioFormat audio_format = audio_codec_get_audio_format(audio_codec);

    const Arg &audio_input_arg = args["-a"];
    const std::vector<AudioInput> audio_inputs = get_pulseaudio_inputs();
    std::vector<MergedAudioInputs> requested_audio_inputs;

    // Manually check if the audio inputs we give exist. This is only needed for pipewire, not pulseaudio.
    // Pipewire instead DEFAULTS TO THE DEFAULT AUDIO INPUT. THAT'S RETARDED.
    // OH, YOU MISSPELLED THE AUDIO INPUT? FUCK YOU
    for(const char *audio_input : audio_input_arg.values) {
        requested_audio_inputs.push_back({parse_audio_input_arg(audio_input)});
        for(AudioInput &request_audio_input : requested_audio_inputs.back().audio_inputs) {
            bool match = false;
            for(const auto &existing_audio_input : audio_inputs) {
                if(strcmp(request_audio_input.name.c_str(), existing_audio_input.name.c_str()) == 0) {
                    if(request_audio_input.description.empty())
                        request_audio_input.description = "gsr-" + existing_audio_input.description;

                    match = true;
                    break;
                }
            }

            if(!match) {
                fprintf(stderr, "Error: Audio input device '%s' is not a valid audio device, expected one of:\n", request_audio_input.name.c_str());
                for(const auto &existing_audio_input : audio_inputs) {
                    fprintf(stderr, "    %s\n", existing_audio_input.name.c_str());
                }
                exit(2);
            }
        }
    }

    const char *container_format = args["-c"].value();
    int fps = atoi(args["-f"].value());
    if(fps == 0) {
        fprintf(stderr, "Invalid fps argument: %s\n", args["-f"].value());
        return 1;
    }
    if(fps < 1)
        fps = 1;

    const char *quality_str = args["-q"].value();
    if(!quality_str)
        quality_str = "very_high";

    VideoQuality quality;
    if(strcmp(quality_str, "medium") == 0) {
        quality = VideoQuality::MEDIUM;
    } else if(strcmp(quality_str, "high") == 0) {
        quality = VideoQuality::HIGH;
    } else if(strcmp(quality_str, "very_high") == 0) {
        quality = VideoQuality::VERY_HIGH;
    } else if(strcmp(quality_str, "ultra") == 0) {
        quality = VideoQuality::ULTRA;
    } else {
        fprintf(stderr, "Error: -q should either be either 'medium', 'high', 'very_high' or 'ultra', got: '%s'\n", quality_str);
        usage();
    }

    int replay_buffer_size_secs = -1;
    const char *replay_buffer_size_secs_str = args["-r"].value();
    if(replay_buffer_size_secs_str) {
        replay_buffer_size_secs = atoi(replay_buffer_size_secs_str);
        if(replay_buffer_size_secs < 5 || replay_buffer_size_secs > 1200) {
            fprintf(stderr, "Error: option -r has to be between 5 and 1200, was: %s\n", replay_buffer_size_secs_str);
            return 1;
        }
        replay_buffer_size_secs += 5; // Add a few seconds to account of lost packets because of non-keyframe packets skipped
    }

    Display *dpy = XOpenDisplay(nullptr);
    if (!dpy) {
        fprintf(stderr, "Error: Failed to open display\n");
        return 2;
    }

    XSetErrorHandler(x11_error_handler);
    XSetIOErrorHandler(x11_io_error_handler);

    gpu_info gpu_inf;
    bool very_old_gpu = false;
    if(!gl_get_gpu_info(dpy, &gpu_inf))
        return 2;

    if(gpu_inf.vendor == GPU_VENDOR_NVIDIA && gpu_inf.gpu_version != 0 && gpu_inf.gpu_version < 900) {
        fprintf(stderr, "Info: your gpu appears to be very old (older than maxwell architecture). Switching to lower preset\n");
        very_old_gpu = true;
    }

    // TODO: Remove once gpu screen recorder supports amd and intel properly
    if(gpu_inf.vendor != GPU_VENDOR_NVIDIA) {
        fprintf(stderr, "Error: gpu-screen-recorder does currently only support nvidia gpus\n");
        return 2;
    }

    const char *screen_region = args["-s"].value();
    const char *window_str = args["-w"].value();

    if(screen_region && strcmp(window_str, "focused") != 0) {
        fprintf(stderr, "Error: option -s is only available when using -w focused\n");
        usage();
    }

    gsr_capture *capture = nullptr;
    if(strcmp(window_str, "focused") == 0) {
        if(!screen_region) {
            fprintf(stderr, "Error: option -s is required when using -w focused\n");
            usage();
        }

        vec2i region_size = { 0, 0 };
        if(sscanf(screen_region, "%dx%d", &region_size.x, &region_size.y) != 2) {
            fprintf(stderr, "Error: invalid value for option -s '%s', expected a value in format WxH\n", screen_region);
            usage();
        }

        if(region_size.x <= 0 || region_size.y <= 0) {
            fprintf(stderr, "Error: invalud value for option -s '%s', expected width and height to be greater than 0\n", screen_region);
            usage();
        }

        switch(gpu_inf.vendor) {
            case GPU_VENDOR_AMD: {
                gsr_capture_xcomposite_drm_params xcomposite_params;
                xcomposite_params.window = 0;
                xcomposite_params.follow_focused = true;
                xcomposite_params.region_size = region_size;
                capture = gsr_capture_xcomposite_drm_create(&xcomposite_params);
                if(!capture)
                    return 1;
                break;
            }
            case GPU_VENDOR_INTEL: {
                gsr_capture_xcomposite_drm_params xcomposite_params;
                xcomposite_params.window = 0;
                xcomposite_params.follow_focused = true;
                xcomposite_params.region_size = region_size;
                capture = gsr_capture_xcomposite_drm_create(&xcomposite_params);
                if(!capture)
                    return 1;
                break;
            }
            case GPU_VENDOR_NVIDIA: {
                gsr_capture_xcomposite_cuda_params xcomposite_params;
                xcomposite_params.window = 0;
                xcomposite_params.follow_focused = true;
                xcomposite_params.region_size = region_size;
                capture = gsr_capture_xcomposite_cuda_create(&xcomposite_params);
                if(!capture)
                    return 1;
                break;
            }
        }
    } else if(contains_non_hex_number(window_str)) {
        if(gpu_inf.vendor != GPU_VENDOR_NVIDIA) {
            fprintf(stderr, "Error: recording a monitor is only supported on NVIDIA right now. Record \"focused\" instead for convenient fullscreen window recording\n");
            return 2;
        }

        if(strcmp(window_str, "screen") != 0 && strcmp(window_str, "screen-direct") != 0 && strcmp(window_str, "screen-direct-force") != 0) {
            gsr_monitor gmon;
            if(!get_monitor_by_name(dpy, window_str, &gmon)) {
                fprintf(stderr, "gsr error: display \"%s\" not found, expected one of:\n", window_str);
                fprintf(stderr, "    \"screen\"    (%dx%d+%d+%d)\n", XWidthOfScreen(DefaultScreenOfDisplay(dpy)), XHeightOfScreen(DefaultScreenOfDisplay(dpy)), 0, 0);
                fprintf(stderr, "    \"screen-direct\"    (%dx%d+%d+%d)\n", XWidthOfScreen(DefaultScreenOfDisplay(dpy)), XHeightOfScreen(DefaultScreenOfDisplay(dpy)), 0, 0);
                fprintf(stderr, "    \"screen-direct-force\"    (%dx%d+%d+%d)\n", XWidthOfScreen(DefaultScreenOfDisplay(dpy)), XHeightOfScreen(DefaultScreenOfDisplay(dpy)), 0, 0);
                for_each_active_monitor_output(dpy, monitor_output_callback_print, NULL);
                return 1;
            }
        }

        const char *capture_target = window_str;
        bool direct_capture = strcmp(window_str, "screen-direct") == 0;
        if(direct_capture) {
            capture_target = "screen";
            // TODO: Temporary disable direct capture because push model causes stuttering when it's direct capturing. This might be a nvfbc bug. This does not happen when using a compositor.
            direct_capture = false;
            fprintf(stderr, "Warning: screen-direct has temporary been disabled as it causes stuttering. This is likely a NvFBC bug. Falling back to \"screen\".\n");
        }

        if(strcmp(window_str, "screen-direct-force") == 0) {
            direct_capture = true;
            capture_target = "screen";
        }

        gsr_capture_nvfbc_params nvfbc_params;
        nvfbc_params.dpy = dpy;
        nvfbc_params.display_to_capture = capture_target;
        nvfbc_params.fps = fps;
        nvfbc_params.pos = { 0, 0 };
        nvfbc_params.size = { 0, 0 };
        nvfbc_params.direct_capture = direct_capture;
        capture = gsr_capture_nvfbc_create(&nvfbc_params);
        if(!capture)
            return 1;
    } else {
        errno = 0;
        Window src_window_id = strtol(window_str, nullptr, 0);
        if(src_window_id == None || errno == EINVAL) {
            fprintf(stderr, "Invalid window number %s\n", window_str);
            usage();
        }

        switch(gpu_inf.vendor) {
            case GPU_VENDOR_AMD: {
                gsr_capture_xcomposite_drm_params xcomposite_params;
                xcomposite_params.window = src_window_id;
                xcomposite_params.follow_focused = false;
                xcomposite_params.region_size = { 0, 0 };
                capture = gsr_capture_xcomposite_drm_create(&xcomposite_params);
                if(!capture)
                    return 1;
                break;
            }
            case GPU_VENDOR_INTEL: {
                gsr_capture_xcomposite_drm_params xcomposite_params;
                xcomposite_params.window = src_window_id;
                xcomposite_params.follow_focused = false;
                xcomposite_params.region_size = { 0, 0 };
                capture = gsr_capture_xcomposite_drm_create(&xcomposite_params);
                if(!capture)
                    return 1;
                break;
            }
            case GPU_VENDOR_NVIDIA: {
                gsr_capture_xcomposite_cuda_params xcomposite_params;
                xcomposite_params.window = src_window_id;
                xcomposite_params.follow_focused = false;
                xcomposite_params.region_size = { 0, 0 };
                capture = gsr_capture_xcomposite_cuda_create(&xcomposite_params);
                if(!capture)
                    return 1;
                break;
            }
        }
    }

    const char *filename = args["-o"].value();
    if(filename) {
        if(replay_buffer_size_secs != -1) {
            if(!container_format) {
                fprintf(stderr, "Error: option -c is required when using option -r\n");
                usage();
            }

            struct stat buf;
            if(stat(filename, &buf) == -1 || !S_ISDIR(buf.st_mode)) {
                fprintf(stderr, "Error: directory \"%s\" does not exist or is not a directory\n", filename);
                usage();
            }
        }
    } else {
        if(replay_buffer_size_secs == -1) {
            filename = "/dev/stdout";
        } else {
            fprintf(stderr, "Error: Option -o is required when using option -r\n");
            usage();
        }

        if(!container_format) {
            fprintf(stderr, "Error: option -c is required when not using option -o\n");
            usage();
        }
    }

    AVFormatContext *av_format_context;
    // The output format is automatically guessed by the file extension
    avformat_alloc_output_context2(&av_format_context, nullptr, container_format, filename);
    if (!av_format_context) {
        fprintf(stderr, "Error: Failed to deduce container format from file extension\n");
        return 1;
    }

    av_format_context->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
    av_format_context->flags |= AVFMT_FLAG_GENPTS;
    const AVOutputFormat *output_format = av_format_context->oformat;

    std::string file_extension = output_format->extensions;
    {
        size_t comma_index = file_extension.find(',');
        if(comma_index != std::string::npos)
            file_extension = file_extension.substr(0, comma_index);
    }

    switch(audio_codec) {
        case AudioCodec::AAC: {
            break;
        }
        case AudioCodec::OPUS: {
            if(file_extension != "mp4" && file_extension != "mkv") {
                audio_codec_to_use = "aac";
                audio_codec = AudioCodec::AAC;
                fprintf(stderr, "Warning: opus audio codec is only supported by .mp4 and .mkv files, falling back to aac instead\n");
            }
            break;
        }
        case AudioCodec::FLAC: {
            if(file_extension != "mp4" && file_extension != "mkv") {
                audio_codec_to_use = "aac";
                audio_codec = AudioCodec::AAC;
                fprintf(stderr, "Warning: flac audio codec is only supported by .mp4 and .mkv files, falling back to aac instead\n");
            }
            break;
        }
    }

    const double target_fps = 1.0 / (double)fps;

    if(strcmp(video_codec_to_use, "auto") == 0) {
        const AVCodec *h265_codec = find_h265_encoder(gpu_inf.vendor);

        // h265 generally allows recording at a higher resolution than h264 on nvidia cards. On a gtx 1080 4k is the max resolution for h264 but for h265 it's 8k.
        // Another important info is that when recording at a higher fps than.. 60? h265 has very bad performance. For example when recording at 144 fps the fps drops to 1
        // while with h264 the fps doesn't drop.
        if(!h265_codec) {
            fprintf(stderr, "Info: using h264 encoder because a codec was not specified and your gpu does not support h265\n");
            video_codec_to_use = "h264";
            video_codec = VideoCodec::H264;
        } else if(fps > 60) {
            fprintf(stderr, "Info: using h264 encoder because a codec was not specified and fps is more than 60\n");
            video_codec_to_use = "h264";
            video_codec = VideoCodec::H264;
        } else {
            fprintf(stderr, "Info: using h265 encoder because a codec was not specified\n");
            video_codec_to_use = "h265";
            video_codec = VideoCodec::H265;
        }
    }

    //bool use_hevc = strcmp(window_str, "screen") == 0 || strcmp(window_str, "screen-direct") == 0;
    if(video_codec != VideoCodec::H264 && strcmp(file_extension.c_str(), "flv") == 0) {
        video_codec_to_use = "h264";
        video_codec = VideoCodec::H264;
        fprintf(stderr, "Warning: h265 is not compatible with flv, falling back to h264 instead.\n");
    }

    const AVCodec *video_codec_f = nullptr;
    switch(video_codec) {
        case VideoCodec::H264:
            video_codec_f = find_h264_encoder(gpu_inf.vendor);
            break;
        case VideoCodec::H265:
            video_codec_f = find_h265_encoder(gpu_inf.vendor);
            break;
    }

    if(!video_codec_f) {
        fprintf(stderr, "Error: your gpu does not support '%s' video codec\n", video_codec == VideoCodec::H264 ? "h264" : "h265");
        exit(2);
    }

    const bool is_livestream = is_livestream_path(filename);
    // (Some?) livestreaming services require at least one audio track to work.
    // If not audio is provided then create one silent audio track.
    if(is_livestream && requested_audio_inputs.empty()) {
        fprintf(stderr, "Info: live streaming but no audio track was added. Adding a silent audio track\n");
        MergedAudioInputs mai;
        mai.audio_inputs.push_back({ "", "gsr-silent" });
        requested_audio_inputs.push_back(std::move(mai));
    }

    AVStream *video_stream = nullptr;
    std::vector<AudioTrack> audio_tracks;

    AVCodecContext *video_codec_context = create_video_codec_context(gpu_inf.vendor == GPU_VENDOR_NVIDIA ? AV_PIX_FMT_CUDA : AV_PIX_FMT_VAAPI, quality, fps, video_codec_f, is_livestream);
    if(replay_buffer_size_secs == -1)
        video_stream = create_stream(av_format_context, video_codec_context);

    if(gsr_capture_start(capture, video_codec_context) != 0) {
        fprintf(stderr, "gsr error: gsr_capture_start failed\n");
        return 1;
    }

    open_video(video_codec_context, quality, very_old_gpu);
    if(video_stream)
        avcodec_parameters_from_context(video_stream->codecpar, video_codec_context);

    int audio_stream_index = VIDEO_STREAM_INDEX + 1;
    for(const MergedAudioInputs &merged_audio_inputs : requested_audio_inputs) {
        AVCodecContext *audio_codec_context = create_audio_codec_context(fps, audio_codec);

        AVStream *audio_stream = nullptr;
        if(replay_buffer_size_secs == -1)
            audio_stream = create_stream(av_format_context, audio_codec_context);

        AVFrame *audio_frame = open_audio(audio_codec_context);
        if(audio_stream)
            avcodec_parameters_from_context(audio_stream->codecpar, audio_codec_context);

        #if LIBAVCODEC_VERSION_MAJOR < 60
        const int num_channels = audio_codec_context->channels;
        #else
        const int num_channels = audio_codec_context->ch_layout.nb_channels;
        #endif

        //audio_frame->sample_rate = audio_codec_context->sample_rate;

        std::vector<AVFilterContext*> src_filter_ctx;
        AVFilterGraph *graph = nullptr;
        AVFilterContext *sink = nullptr;
        bool use_amix = merged_audio_inputs.audio_inputs.size() > 1;
        if(use_amix) {
            int err = init_filter_graph(audio_codec_context, &graph, &sink, src_filter_ctx, merged_audio_inputs.audio_inputs.size());
            if(err < 0) {
                fprintf(stderr, "Error: failed to create audio filter\n");
                exit(1);
            }
        }

        // TODO: Cleanup above

        std::vector<AudioDevice> audio_devices;
        for(size_t i = 0; i < merged_audio_inputs.audio_inputs.size(); ++i) {
            auto &audio_input = merged_audio_inputs.audio_inputs[i];
            AVFilterContext *src_ctx = nullptr;
            if(use_amix)
                src_ctx = src_filter_ctx[i];

            AudioDevice audio_device;
            audio_device.audio_input = audio_input;
            audio_device.src_filter_ctx = src_ctx;

            if(audio_input.name.empty()) {
                audio_device.sound_device.handle = NULL;
                audio_device.sound_device.frames = 0;
            } else {
                if(sound_device_get_by_name(&audio_device.sound_device, audio_input.name.c_str(), audio_input.description.c_str(), num_channels, audio_codec_context->frame_size, audio_format) != 0) {
                    fprintf(stderr, "Error: failed to get \"%s\" sound device\n", audio_input.name.c_str());
                    exit(1);
                }
            }

            audio_devices.push_back(std::move(audio_device));
        }

        AudioTrack audio_track;
        audio_track.codec_context = audio_codec_context;
        audio_track.frame = audio_frame;
        audio_track.stream = audio_stream;
        audio_track.audio_devices = std::move(audio_devices);
        audio_track.graph = graph;
        audio_track.sink = sink;
        audio_track.pts = 0;
        audio_track.stream_index = audio_stream_index;
        audio_tracks.push_back(std::move(audio_track));
        ++audio_stream_index;
    }

    //av_dump_format(av_format_context, 0, filename, 1);

    if (replay_buffer_size_secs == -1 && !(output_format->flags & AVFMT_NOFILE)) {
        int ret = avio_open(&av_format_context->pb, filename, AVIO_FLAG_WRITE);
        if (ret < 0) {
            fprintf(stderr, "Error: Could not open '%s': %s\n", filename, av_error_to_string(ret));
            return 1;
        }
    }

    if(replay_buffer_size_secs == -1) {
        AVDictionary *options = nullptr;
        av_dict_set(&options, "strict", "experimental", 0);

        int ret = avformat_write_header(av_format_context, &options);
        if (ret < 0) {
            fprintf(stderr, "Error occurred when writing header to output file: %s\n", av_error_to_string(ret));
            return 1;
        }

        av_dict_free(&options);
    }

    const double start_time_pts = clock_get_monotonic_seconds();

    double start_time = clock_get_monotonic_seconds();
    double frame_timer_start = start_time;
    int fps_counter = 0;

    AVFrame *frame = av_frame_alloc();
    if (!frame) {
        fprintf(stderr, "Error: Failed to allocate frame\n");
        exit(1);
    }
    frame->format = video_codec_context->pix_fmt;
    frame->width = video_codec_context->width;
    frame->height = video_codec_context->height;
    frame->color_range = AVCOL_RANGE_JPEG;

    std::mutex write_output_mutex;
    std::mutex audio_filter_mutex;

    const double record_start_time = clock_get_monotonic_seconds();
    std::deque<AVPacket> frame_data_queue;
    bool frames_erased = false;

    const size_t audio_buffer_size = 1024 * 4 * 2; // max 4 bytes/sample, 2 channels
    uint8_t *empty_audio = (uint8_t*)malloc(audio_buffer_size);
    if(!empty_audio) {
        fprintf(stderr, "Error: failed to create empty audio\n");
        exit(1);
    }
    memset(empty_audio, 0, audio_buffer_size);

    for(AudioTrack &audio_track : audio_tracks) {
        for(AudioDevice &audio_device : audio_track.audio_devices) {
            audio_device.thread = std::thread([record_start_time, replay_buffer_size_secs, &frame_data_queue, &frames_erased, &audio_track, empty_audio, &audio_device, &audio_filter_mutex, &write_output_mutex, audio_format](AVFormatContext *av_format_context) mutable {
                const AVSampleFormat sound_device_sample_format = audio_format_to_sample_format(audio_format);
                const bool needs_audio_conversion = audio_track.codec_context->sample_fmt != sound_device_sample_format;
                SwrContext *swr = nullptr;
                if(needs_audio_conversion) {
                    swr = swr_alloc();
                    if(!swr) {
                        fprintf(stderr, "Failed to create SwrContext\n");
                        exit(1);
                    }
                    av_opt_set_int(swr, "in_channel_layout", AV_CH_LAYOUT_STEREO, 0);
                    av_opt_set_int(swr, "out_channel_layout", AV_CH_LAYOUT_STEREO, 0);
                    av_opt_set_int(swr, "in_sample_rate", audio_track.codec_context->sample_rate, 0);
                    av_opt_set_int(swr, "out_sample_rate", audio_track.codec_context->sample_rate, 0);
                    av_opt_set_sample_fmt(swr, "in_sample_fmt", sound_device_sample_format, 0);
                    av_opt_set_sample_fmt(swr, "out_sample_fmt", audio_track.codec_context->sample_fmt, 0);
                    swr_init(swr);
                }

                const double target_audio_hz = 1.0 / (double)audio_track.codec_context->sample_rate;
                double received_audio_time = clock_get_monotonic_seconds();
                const int64_t timeout_ms = std::round((1000.0 / (double)audio_track.codec_context->sample_rate) * 1000.0);

                while(running) {
                    void *sound_buffer;
                    int sound_buffer_size = -1;
                    if(audio_device.sound_device.handle)
                        sound_buffer_size = sound_device_read_next_chunk(&audio_device.sound_device, &sound_buffer);
                    const bool got_audio_data = sound_buffer_size >= 0;

                    const double this_audio_frame_time = clock_get_monotonic_seconds();
                    if(got_audio_data)
                        received_audio_time = this_audio_frame_time;

                    int ret = av_frame_make_writable(audio_track.frame);
                    if (ret < 0) {
                        fprintf(stderr, "Failed to make audio frame writable\n");
                        break;
                    }

                    int64_t num_missing_frames = std::round((this_audio_frame_time - received_audio_time) / target_audio_hz / (int64_t)audio_track.frame->nb_samples);
                    if(got_audio_data)
                        num_missing_frames = std::max((int64_t)0, num_missing_frames - 1);

                    if(!audio_device.sound_device.handle)
                        num_missing_frames = std::max((int64_t)1, num_missing_frames);

                    // Jesus is there a better way to do this? I JUST WANT TO KEEP VIDEO AND AUDIO SYNCED HOLY FUCK I WANT TO KILL MYSELF NOW.
                    // THIS PIECE OF SHIT WANTS EMPTY FRAMES OTHERWISE VIDEO PLAYS TOO FAST TO KEEP UP WITH AUDIO OR THE AUDIO PLAYS TOO EARLY.
                    // BUT WE CANT USE DELAYS TO GIVE DUMMY DATA BECAUSE PULSEAUDIO MIGHT GIVE AUDIO A BIG DELAYED!!!
                    if(num_missing_frames >= 5 || !audio_device.sound_device.handle) {
                        // TODO:
                        //audio_track.frame->data[0] = empty_audio;
                        received_audio_time = this_audio_frame_time;
                        if(needs_audio_conversion)
                            swr_convert(swr, &audio_track.frame->data[0], audio_track.frame->nb_samples, (const uint8_t**)&empty_audio, audio_track.codec_context->frame_size);
                        else
                            audio_track.frame->data[0] = empty_audio;

                        // TODO: Check if duplicate frame can be saved just by writing it with a different pts instead of sending it again
                        std::lock_guard<std::mutex> lock(audio_filter_mutex);
                        for(int i = 0; i < num_missing_frames; ++i) {
                            if(audio_track.graph) {
                                // TODO: av_buffersrc_add_frame
                                if(av_buffersrc_write_frame(audio_device.src_filter_ctx, audio_track.frame) < 0) {
                                    fprintf(stderr, "Error: failed to add audio frame to filter\n");
                                }
                            } else {
                                audio_track.frame->pts = audio_track.pts;
                                audio_track.pts += audio_track.frame->nb_samples;
                                ret = avcodec_send_frame(audio_track.codec_context, audio_track.frame);
                                if(ret >= 0){
                                    receive_frames(audio_track.codec_context, audio_track.stream_index, audio_track.stream, audio_track.frame, av_format_context, record_start_time, frame_data_queue, replay_buffer_size_secs, frames_erased, write_output_mutex);
                                } else {
                                    fprintf(stderr, "Failed to encode audio!\n");
                                }
                            }
                        }
                    }

                    if(!audio_device.sound_device.handle)
                        usleep(timeout_ms * 1000);

                    if(got_audio_data) {
                        // TODO: Instead of converting audio, get float audio from alsa. Or does alsa do conversion internally to get this format?
                        if(needs_audio_conversion)
                            swr_convert(swr, &audio_track.frame->data[0], audio_track.frame->nb_samples, (const uint8_t**)&sound_buffer, audio_track.codec_context->frame_size);
                        else
                            audio_track.frame->data[0] = (uint8_t*)sound_buffer;

                        if(audio_track.graph) {
                            std::lock_guard<std::mutex> lock(audio_filter_mutex);
                            // TODO: av_buffersrc_add_frame
                            if(av_buffersrc_write_frame(audio_device.src_filter_ctx, audio_track.frame) < 0) {
                                fprintf(stderr, "Error: failed to add audio frame to filter\n");
                            }
                        } else {
                            audio_track.frame->pts = audio_track.pts;
                            audio_track.pts += audio_track.frame->nb_samples;
                            ret = avcodec_send_frame(audio_track.codec_context, audio_track.frame);
                            if(ret >= 0){
                                receive_frames(audio_track.codec_context, audio_track.stream_index, audio_track.stream, audio_track.frame, av_format_context, record_start_time, frame_data_queue, replay_buffer_size_secs, frames_erased, write_output_mutex);
                            } else {
                                fprintf(stderr, "Failed to encode audio!\n");
                            }
                        }
                    }
                }

                if(swr)
                    swr_free(&swr);
            }, av_format_context);
        }
    }

    // Set update_fps to 24 to test if duplicate/delayed frames cause video/audio desync or too fast/slow video.
    const double update_fps = fps + 190;
    int64_t video_pts_counter = 0;
    bool should_stop_error = false;

    AVFrame *aframe = av_frame_alloc();

    while (running) {
        double frame_start = clock_get_monotonic_seconds();

        gsr_capture_tick(capture, video_codec_context, &frame);
        should_stop_error = false;
        if(gsr_capture_should_stop(capture, &should_stop_error)) {
            running = 0;
            break;
        }
        ++fps_counter;

        {
            std::lock_guard<std::mutex> lock(audio_filter_mutex);
            for(AudioTrack &audio_track : audio_tracks) {
                if(!audio_track.sink)
                    continue;

                int err = 0;
                while ((err = av_buffersink_get_frame(audio_track.sink, aframe)) >= 0) {
                    aframe->pts = audio_track.pts;
                    audio_track.pts += audio_track.codec_context->frame_size;
                    err = avcodec_send_frame(audio_track.codec_context, aframe);
                    if(err >= 0){
                        receive_frames(audio_track.codec_context, audio_track.stream_index, audio_track.stream, aframe, av_format_context, record_start_time, frame_data_queue, replay_buffer_size_secs, frames_erased, write_output_mutex);
                    } else {
                        fprintf(stderr, "Failed to encode audio!\n");
                    }
                    av_frame_unref(aframe);
                }
            }
        }

        double time_now = clock_get_monotonic_seconds();
        double frame_timer_elapsed = time_now - frame_timer_start;
        double elapsed = time_now - start_time;
        if (elapsed >= 1.0) {
            fprintf(stderr, "update fps: %d\n", fps_counter);
            start_time = time_now;
            fps_counter = 0;
        }

        double frame_time_overflow = frame_timer_elapsed - target_fps;
        if (frame_time_overflow >= 0.0) {
            frame_timer_start = time_now - frame_time_overflow;
            gsr_capture_capture(capture, frame);

            const double this_video_frame_time = clock_get_monotonic_seconds();
            const int64_t expected_frames = std::round((this_video_frame_time - start_time_pts) / target_fps);

            const int num_frames = std::max(0L, expected_frames - video_pts_counter);

            frame->flags &= ~AV_FRAME_FLAG_DISCARD;
            // TODO: Check if duplicate frame can be saved just by writing it with a different pts instead of sending it again
            for(int i = 0; i < num_frames; ++i) {
                if(i > 0)
                    frame->flags |= AV_FRAME_FLAG_DISCARD;

                frame->pts = video_pts_counter + i;
                int ret = avcodec_send_frame(video_codec_context, frame);
                if (ret >= 0) {
                    receive_frames(video_codec_context, VIDEO_STREAM_INDEX, video_stream, frame, av_format_context,
                                record_start_time, frame_data_queue, replay_buffer_size_secs, frames_erased, write_output_mutex);
                } else {
                    fprintf(stderr, "Error: avcodec_send_frame failed, error: %s\n", av_error_to_string(ret));
                }
            }
            video_pts_counter += num_frames;
        }

        if(save_replay_thread.valid() && save_replay_thread.wait_for(std::chrono::seconds(0)) == std::future_status::ready) {
            save_replay_thread.get();
            puts(save_replay_output_filepath.c_str());
            save_replay_packets.clear();
        }

        if(save_replay == 1 && !save_replay_thread.valid() && replay_buffer_size_secs != -1) {
            save_replay = 0;
            save_replay_async(video_codec_context, VIDEO_STREAM_INDEX, audio_tracks, frame_data_queue, frames_erased, filename, container_format, file_extension, write_output_mutex);
        }

        // av_frame_free(&frame);
        double frame_end = clock_get_monotonic_seconds();
        double frame_sleep_fps = 1.0 / update_fps;
        double sleep_time = frame_sleep_fps - (frame_end - frame_start);
        if(sleep_time > 0.0)
            usleep(sleep_time * 1000.0 * 1000.0);
    }

	running = 0;
    av_frame_free(&aframe);

    if(save_replay_thread.valid()) {
        save_replay_thread.get();
        puts(save_replay_output_filepath.c_str());
    }

    for(AudioTrack &audio_track : audio_tracks) {
        for(AudioDevice &audio_device : audio_track.audio_devices) {
            audio_device.thread.join();
            sound_device_close(&audio_device.sound_device);
        }
    }

    if (replay_buffer_size_secs == -1 && av_write_trailer(av_format_context) != 0) {
        fprintf(stderr, "Failed to write trailer\n");
    }

    if(replay_buffer_size_secs == -1 && !(output_format->flags & AVFMT_NOFILE))
        avio_close(av_format_context->pb);

    gsr_capture_destroy(capture, video_codec_context);

    if(dpy)
        XCloseDisplay(dpy);

    free(empty_audio);
    return should_stop_error ? 3 : 0;
}