summaryrefslogtreecommitdiffstats
path: root/tinyDAV/src/codecs/h263/tdav_codec_h263.c
blob: ddbd18b651bb8684b2fbed05001b551c8dd79ee8 (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
/*
* Copyright (C) 2010-2011 Mamadou Diop.
*
* Contact: Mamadou Diop <diopmamadou(at)doubango.org>
*
* This file is part of Open Source Doubango Framework.
*
* DOUBANGO is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* DOUBANGO is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with DOUBANGO.
*
*/

/**@file tdav_codec_h263.c
 * @brief H.263-1996 and H.263-1998 codec plugins.
 * RTP payloader follows RFC 4629 for H263+ and RFC 2190 for H263.
 *
 * @author Mamadou Diop <diopmamadou(at)doubango.org>
 *

 */
#include "tinydav/codecs/h263/tdav_codec_h263.h"

#if HAVE_FFMPEG

#include "tinydav/video/tdav_converter_video.h"

#include "tinyrtp/rtp/trtp_rtp_packet.h"

#include "tnet_endianness.h"

#include "tinymedia/tmedia_params.h"
#include "tinymedia/tmedia_defaults.h"

#include "tsk_string.h"
#include "tsk_time.h"
#include "tsk_memory.h"
#include "tsk_debug.h"

#include <libavcodec/avcodec.h>

#define TDAV_H263_GOP_SIZE_IN_SECONDS		25
#define RTP_PAYLOAD_SIZE	750

#define H263P_HEADER_SIZE		2
#define H263_HEADER_MODE_A_SIZE 4
#define H263_HEADER_MODE_B_SIZE 8
#define H263_HEADER_MODE_C_SIZE 12

#define tdav_codec_h263p_set tdav_codec_h263_set
#define tdav_codec_h263p_open tdav_codec_h263_open
#define tdav_codec_h263p_close tdav_codec_h263_close
#define tdav_codec_h263p_encode tdav_codec_h263_encode
#define tdav_codec_h263p_sdp_att_match tdav_codec_h263_sdp_att_match
#define tdav_codec_h263p_sdp_att_get tdav_codec_h263_sdp_att_get

#define tdav_codec_h263pp_set tdav_codec_h263_set
#define tdav_codec_h263pp_open tdav_codec_h263_open
#define tdav_codec_h263pp_close tdav_codec_h263_close
#define tdav_codec_h263pp_encode tdav_codec_h263_encode
#define tdav_codec_h263pp_decode tdav_codec_h263_decode
#define tdav_codec_h263pp_sdp_att_match tdav_codec_h263_sdp_att_match
#define tdav_codec_h263pp_sdp_att_get tdav_codec_h263_sdp_att_get

#define TDAV_CODEC_H263(self) ((tdav_codec_h263_t*)(self))

typedef enum tdav_codec_h263_type_e {
    tdav_codec_h263_1996,
    tdav_codec_h263_1998,
    tdav_codec_h263_2000,
}
tdav_codec_h263_type_t;

/** H.263-1996 codec */
typedef struct tdav_codec_h263_s {
    TMEDIA_DECLARE_CODEC_VIDEO;

    tdav_codec_h263_type_t type;

    struct {
        uint8_t* ptr;
        tsk_size_t size;
    } rtp;

    // Encoder
    struct {
        AVCodec* codec;
        AVCodecContext* context;
        AVFrame* picture;
        void* buffer;
        tsk_bool_t force_idr;
        int32_t quality; // [1-31]
        int32_t max_bw_kpbs;
    } encoder;

    // decoder
    struct {
        AVCodec* codec;
        AVCodecContext* context;
        AVFrame* picture;

        void* accumulator;
        uint8_t ebit;
        tsk_size_t accumulator_pos;
        uint16_t last_seq;
    } decoder;
}
tdav_codec_h263_t;

#define TDAV_DECLARE_CODEC_H263 tdav_codec_h263_t __codec_h263__

static int tdav_codec_h263_init(tdav_codec_h263_t* self, tdav_codec_h263_type_t type, enum AVCodecID encoder, enum AVCodecID decoder);
static int tdav_codec_h263_deinit(tdav_codec_h263_t* self);
static int tdav_codec_h263_open_encoder(tdav_codec_h263_t* self);
static int tdav_codec_h263_open_decoder(tdav_codec_h263_t* self);
static int tdav_codec_h263_close_encoder(tdav_codec_h263_t* self);
static int tdav_codec_h263_close_decoder(tdav_codec_h263_t* self);

/** H.263-1998 codec */
typedef struct tdav_codec_h263p_s {
    TDAV_DECLARE_CODEC_H263;
}
tdav_codec_h263p_t;

/** H.263-2000 codec */
typedef struct tdav_codec_h263pp_s {
    TDAV_DECLARE_CODEC_H263;
}
tdav_codec_h263pp_t;


static void tdav_codec_h263_rtp_callback(tdav_codec_h263_t *self, const void *data, tsk_size_t size, tsk_bool_t marker);
static void tdav_codec_h263p_rtp_callback(tdav_codec_h263_t *self, const void *data, tsk_size_t size, tsk_bool_t frag, tsk_bool_t marker);

static void tdav_codec_h263_encap(const tdav_codec_h263_t* h263, const uint8_t* pdata, tsk_size_t size);


/* ============ Common To all H263 codecs ================= */

static int tdav_codec_h263_set(tmedia_codec_t* self, const tmedia_param_t* param)
{
    tdav_codec_h263_t* h263 = (tdav_codec_h263_t*)self;
    if(!self->opened) {
        TSK_DEBUG_ERROR("Codec not opened");
        return -1;
    }
    if(param->value_type == tmedia_pvt_int32) {
        if(tsk_striequals(param->key, "action")) {
            tmedia_codec_action_t action = (tmedia_codec_action_t)TSK_TO_INT32((uint8_t*)param->value);
            switch(action) {
            case tmedia_codec_action_encode_idr: {
                h263->encoder.force_idr = tsk_true;
                break;
            }
            case tmedia_codec_action_bw_down: {
                h263->encoder.quality = TSK_CLAMP(1, (h263->encoder.quality + 1), 31);
                h263->encoder.context->global_quality = FF_QP2LAMBDA * h263->encoder.quality;
                break;
            }
            case tmedia_codec_action_bw_up: {
                h263->encoder.quality = TSK_CLAMP(1, (h263->encoder.quality - 1), 31);
                h263->encoder.context->global_quality = FF_QP2LAMBDA * h263->encoder.quality;
                break;
            }
            }
            return 0;
        }
    }
    return -1;
}

int tdav_codec_h263_init(tdav_codec_h263_t* self, tdav_codec_h263_type_t type, enum AVCodecID encoder, enum AVCodecID decoder)
{
    int ret = 0;

    if(!self) {
        TSK_DEBUG_ERROR("Invalid parameter");
        return -1;
    }

    self->type = type;
    self->encoder.quality = 1;

    if(!(self->encoder.codec = avcodec_find_encoder(encoder))) {
        TSK_DEBUG_ERROR("Failed to find [%d]encoder", encoder);
        ret = -2;
    }

    if(!(self->decoder.codec = avcodec_find_decoder(decoder))) {
        TSK_DEBUG_ERROR("Failed to find [%d] decoder", decoder);
        ret = -3;
    }

    self->encoder.max_bw_kpbs = tmedia_defaults_get_bandwidth_video_upload_max();

    /* allocations MUST be done by open() */
    return ret;
}

int tdav_codec_h263_deinit(tdav_codec_h263_t* self)
{
    if(!self) {
        TSK_DEBUG_ERROR("Invalid parameter");
        return -1;
    }

    self->encoder.codec = tsk_null;
    self->decoder.codec = tsk_null;

    // FFMpeg resources are destroyed by close()



    TSK_FREE(self->rtp.ptr);
    self->rtp.size = 0;

    return 0;
}



/* ============ H.263-1996 Plugin interface ================= */

//
//	H.263-1996 object definition
//
static int tdav_codec_h263_open(tmedia_codec_t* self)
{
    int ret;

    tdav_codec_h263_t* h263 = (tdav_codec_h263_t*)self;

    if(!h263) {
        TSK_DEBUG_ERROR("Invalid parameter");
        return -1;
    }

    /* the caller (base class) already checked that the codec is not opened */

    //	Encoder
    if((ret = tdav_codec_h263_open_encoder(h263))) {
        return ret;
    }

    //	Decoder
    if((ret = tdav_codec_h263_open_decoder(h263))) {
        return ret;
    }

    return ret;
}

static int tdav_codec_h263_close(tmedia_codec_t* self)
{
    tdav_codec_h263_t* h263 = (tdav_codec_h263_t*)self;
    int ret;

    if(!h263) {
        TSK_DEBUG_ERROR("Invalid parameter");
        return -1;
    }

    /* the caller (base class) already checked that the codec is opened */

    //	Encoder
    ret = tdav_codec_h263_close_encoder(h263);
    //	Decoder
    ret = tdav_codec_h263_close_decoder(h263);

    return ret;
}

static tsk_size_t tdav_codec_h263_encode(tmedia_codec_t* self, const void* in_data, tsk_size_t in_size, void** out_data, tsk_size_t* out_max_size)
{
    int ret;
    int size;

    tdav_codec_h263_t* h263 = (tdav_codec_h263_t*)self;

    if(!self || !in_data || !in_size || !out_data) {
        TSK_DEBUG_ERROR("Invalid parameter");
        return 0;
    }

    // wrap yuv420 buffer
    size = avpicture_fill((AVPicture *)h263->encoder.picture, (uint8_t*)in_data, PIX_FMT_YUV420P, h263->encoder.context->width, h263->encoder.context->height);
    if(size != in_size) {
        /* guard */
        TSK_DEBUG_ERROR("Invalid size");
        return 0;
    }
#if LIBAVCODEC_VERSION_MAJOR <= 53
    h263->encoder.picture->pict_type = h263->encoder.force_idr ? FF_I_TYPE : 0;
#else
    h263->encoder.picture->pict_type = h263->encoder.force_idr ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_NONE;
#endif
    h263->encoder.picture->pts = AV_NOPTS_VALUE;
    h263->encoder.picture->quality = h263->encoder.context->global_quality;
    ret = avcodec_encode_video(h263->encoder.context, h263->encoder.buffer, size, h263->encoder.picture);
    if(ret > 0) {
        tdav_codec_h263_encap(h263, h263->encoder.buffer, (tsk_size_t)ret);
    }
    h263->encoder.force_idr = tsk_false;

    return 0;
}

static tsk_size_t tdav_codec_h263_decode(tmedia_codec_t* self, const void* in_data, tsk_size_t in_size, void** out_data, tsk_size_t* out_max_size, const tsk_object_t* proto_hdr)
{
    uint8_t F, P, sbit, ebit;
    const uint8_t* pdata = in_data;
    const uint8_t* pay_ptr;
    tsk_size_t pay_size;
    tsk_size_t hdr_size;
    tsk_size_t xsize, retsize = 0;
    int got_picture_ptr;
    int ret;

    tdav_codec_h263_t* h263 = (tdav_codec_h263_t*)self;
    const trtp_rtp_header_t* rtp_hdr = proto_hdr;
    tsk_bool_t is_idr = tsk_false;

    if(!self || !in_data || !in_size || !out_data || !h263->decoder.context) {
        TSK_DEBUG_ERROR("Invalid parameter");
        return 0;
    }

    /*	RFC 2190
    	get F and P bits, used to determine the header Mode (A, B or C)
    	F: 1 bit
    	The flag bit indicates the mode of the payload header. F=0, mode A;
    	F=1, mode B or mode C depending on P bit defined below.
    	P: 1 bit
    	Optional PB-frames mode as defined by the H.263 [4]. "0" implies
    	normal I or P frame, "1" PB-frames. When F=1, P also indicates modes:
    	mode B if P=0, mode C if P=1.

    	I:  1 bit.
       Picture coding type, bit 9 in PTYPE defined by H.263[4], "0" is
       intra-coded, "1" is inter-coded.
    */
    F = *pdata >> 7;
    P = (*pdata >> 6) & 0x01;

    /* SBIT and EBIT */
    sbit = (*pdata >> 3) & 0x0F;
    ebit = (*pdata & 0x07);

    if(F == 0) {
        /*	MODE A
        	0                   1                   2                   3
        	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
        	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        	|F|P|SBIT |EBIT | SRC |I|U|S|A|R      |DBQ| TRB |    TR         |
        	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        */
        hdr_size = H263_HEADER_MODE_A_SIZE;
        is_idr = (in_size >= 2) && !(pdata[1] & 0x10) /* I==1 */;
    }
    else if(P == 0) { // F=1 and P=0
        /* MODE B
        	 0                   1                   2                   3
        	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
        	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        	|F|P|SBIT |EBIT | SRC | QUANT   |  GOBN   |   MBA           |R  |
        	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        	|I|U|S|A| HMV1        | VMV1        | HMV2        | VMV2        |
        	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        */
        hdr_size = H263_HEADER_MODE_B_SIZE;
        is_idr = (in_size >= 5) && !(pdata[4] & 0x80) /* I==1 */;
    }
    else { // F=1 and P=1
        /* MODE C
        	 0                   1                   2                   3
        	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
        	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        	|F|P|SBIT |EBIT | SRC | QUANT   |  GOBN   |   MBA           |R  |
        	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        	|I|U|S|A| HMV1        | VMV1        | HMV2        | VMV2        |
        	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        	| RR                                  |DBQ| TRB |    TR         |
        	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        */
        hdr_size = H263_HEADER_MODE_C_SIZE;
        is_idr = (in_size >= 5) && !(pdata[4] & 0x80) /* I==1 */;
    }

    /* Check size */
    if(in_size < hdr_size) {
        TSK_DEBUG_ERROR("Too short");
        return 0;
    }

    pay_ptr = (pdata + hdr_size);
    pay_size = (in_size - hdr_size);
    xsize = avpicture_get_size(h263->decoder.context->pix_fmt, h263->decoder.context->width, h263->decoder.context->height);

    /* Packet lost? */
    if(h263->decoder.last_seq != (rtp_hdr->seq_num - 1) && h263->decoder.last_seq) {
        if(h263->decoder.last_seq == rtp_hdr->seq_num) {
            // Could happen on some stupid emulators
            //TSK_DEBUG_INFO("Packet duplicated, seq_num=%d", rtp_hdr->seq_num);
            return 0;
        }
        TSK_DEBUG_INFO("[H.263] Packet loss, seq_num=%d", rtp_hdr->seq_num);
    }
    h263->decoder.last_seq = rtp_hdr->seq_num;

    if((int)(h263->decoder.accumulator_pos + pay_size) <= xsize) {
        if((h263->decoder.ebit + sbit) == 8) { /* Perfect one Byte to clean up */
            if(h263->decoder.accumulator_pos) {
                ((uint8_t*)h263->decoder.accumulator)[h263->decoder.accumulator_pos-1] = (((uint8_t*)h263->decoder.accumulator)[h263->decoder.accumulator_pos-1] & (0xFF << h263->decoder.ebit)) |
                        (*pay_ptr & (0xFF >> sbit));
            }
            pay_ptr++, pay_size--;
        }
        h263->decoder.ebit = ebit;

        memcpy(&((uint8_t*)h263->decoder.accumulator)[h263->decoder.accumulator_pos], pay_ptr, pay_size);
        h263->decoder.accumulator_pos += pay_size;
    }
    else {
        TSK_DEBUG_WARN("Buffer overflow");
        h263->decoder.accumulator_pos = 0;
        return 0;
    }

    if(rtp_hdr->marker) {
        AVPacket packet;
        /* allocate destination buffer */
        if(*out_max_size <xsize) {
            if(!(*out_data = tsk_realloc(*out_data, xsize))) {
                TSK_DEBUG_ERROR("Failed to allocate new buffer");
                h263->decoder.accumulator_pos = 0;
                *out_max_size = 0;
                return 0;
            }
            *out_max_size = xsize;
        }

        av_init_packet(&packet);
        packet.size = (int)h263->decoder.accumulator_pos;
        packet.data = h263->decoder.accumulator;
        ret = avcodec_decode_video2(h263->decoder.context, h263->decoder.picture, &got_picture_ptr, &packet);

        if(ret < 0) {
            TSK_DEBUG_WARN("Failed to decode the buffer with error code = %d", ret);
            if(TMEDIA_CODEC_VIDEO(self)->in.callback) {
                TMEDIA_CODEC_VIDEO(self)->in.result.type = tmedia_video_decode_result_type_error;
                TMEDIA_CODEC_VIDEO(self)->in.result.proto_hdr = proto_hdr;
                TMEDIA_CODEC_VIDEO(self)->in.callback(&TMEDIA_CODEC_VIDEO(self)->in.result);
            }
        }
        else if(got_picture_ptr) {
            retsize = xsize;
            // Is it IDR frame?
            if(is_idr && TMEDIA_CODEC_VIDEO(self)->in.callback) {
                TSK_DEBUG_INFO("Decoded H.263 IDR");
                TMEDIA_CODEC_VIDEO(self)->in.result.type = tmedia_video_decode_result_type_idr;
                TMEDIA_CODEC_VIDEO(self)->in.result.proto_hdr = proto_hdr;
                TMEDIA_CODEC_VIDEO(self)->in.callback(&TMEDIA_CODEC_VIDEO(self)->in.result);
            }
            TMEDIA_CODEC_VIDEO(h263)->in.width = h263->decoder.context->width;
            TMEDIA_CODEC_VIDEO(h263)->in.height = h263->decoder.context->height;
            /* copy picture into a linear buffer */
            avpicture_layout((AVPicture *)h263->decoder.picture, h263->decoder.context->pix_fmt, (int)h263->decoder.context->width, (int)h263->decoder.context->height,
                             *out_data, (int)retsize);
        }
        /* in all cases: reset accumulator */
        h263->decoder.accumulator_pos = 0;
    }

    return retsize;
}

static tsk_bool_t tdav_codec_h263_sdp_att_match(const tmedia_codec_t* codec, const char* att_name, const char* att_value)
{
    if(tsk_striequals(att_name, "fmtp")) {
        unsigned width, height, fps;
        if(tmedia_parse_video_fmtp(att_value, TMEDIA_CODEC_VIDEO(codec)->pref_size, &width, &height, &fps)) {
            TSK_DEBUG_ERROR("Failed to match fmtp=%s", att_value);
            return tsk_false;
        }
        TMEDIA_CODEC_VIDEO(codec)->in.width = TMEDIA_CODEC_VIDEO(codec)->out.width = width;
        TMEDIA_CODEC_VIDEO(codec)->in.height = TMEDIA_CODEC_VIDEO(codec)->out.height = height;
        TMEDIA_CODEC_VIDEO(codec)->in.fps = TMEDIA_CODEC_VIDEO(codec)->out.fps = fps;
    }
#if 0
    else if(tsk_striequals(att_name, "imageattr")) {
        unsigned in_width, in_height, out_width, out_height;
        if(tmedia_parse_video_imageattr(att_value, TMEDIA_CODEC_VIDEO(codec)->pref_size, &in_width, &in_height, &out_width, &out_height) != 0) {
            return tsk_false;
        }
        TMEDIA_CODEC_VIDEO(codec)->in.width = in_width;
        TMEDIA_CODEC_VIDEO(codec)->in.height = in_height;
        TMEDIA_CODEC_VIDEO(codec)->out.width = out_width;
        TMEDIA_CODEC_VIDEO(codec)->out.height = out_height;
    }
#endif

    return tsk_true;
}

static char* tdav_codec_h263_sdp_att_get(const tmedia_codec_t* codec, const char* att_name)
{
    if(tsk_striequals(att_name, "fmtp")) {
        tmedia_pref_video_size_t cif_vs;
        if(tmedia_video_get_closest_cif_size(TMEDIA_CODEC_VIDEO(codec)->pref_size, &cif_vs)) {
            TSK_DEBUG_ERROR("Failed to get closest CIF family size");
            return tsk_null;
        }
        return tmedia_get_video_fmtp(cif_vs);
    }
#if 0
    else if(tsk_striequals(att_name, "imageattr")) {
        return tmedia_get_video_imageattr(TMEDIA_CODEC_VIDEO(codec)->pref_size,
                                          TMEDIA_CODEC_VIDEO(codec)->in.width, TMEDIA_CODEC_VIDEO(codec)->in.height, TMEDIA_CODEC_VIDEO(codec)->out.width, TMEDIA_CODEC_VIDEO(codec)->out.height);
    }
#endif
    return tsk_null;
}

/* constructor */
static tsk_object_t* tdav_codec_h263_ctor(tsk_object_t * self, va_list * app)
{
    tdav_codec_h263_t *h263 = self;
    if(h263) {
        /* init base: called by tmedia_codec_create() */
        /* init self */
        tdav_codec_h263_init(TDAV_CODEC_H263(self), tdav_codec_h263_1996, CODEC_ID_H263, CODEC_ID_H263);
    }
    return self;
}
/* destructor */
static tsk_object_t* tdav_codec_h263_dtor(tsk_object_t * self)
{
    tdav_codec_h263_t *h263 = self;
    if(h263) {
        /* deinit base */
        tmedia_codec_video_deinit(h263);
        /* deinit self */
        tdav_codec_h263_deinit(TDAV_CODEC_H263(self));

    }

    return self;
}
/* object definition */
static const tsk_object_def_t tdav_codec_h263_def_s = {
    sizeof(tdav_codec_h263_t),
    tdav_codec_h263_ctor,
    tdav_codec_h263_dtor,
    tmedia_codec_cmp,
};
/* plugin definition*/
static const tmedia_codec_plugin_def_t tdav_codec_h263_plugin_def_s = {
    &tdav_codec_h263_def_s,

    tmedia_video,
    tmedia_codec_id_h263,
    "H263",
    "H263-1996 codec (FFmpeg)",
    TMEDIA_CODEC_FORMAT_H263,
    tsk_false,
    90000, // rate

    /* audio */
    { 0 },

    /* video */
    {176, 144, 15},

    tdav_codec_h263_set,
    tdav_codec_h263_open,
    tdav_codec_h263_close,
    tdav_codec_h263_encode,
    tdav_codec_h263_decode,
    tdav_codec_h263_sdp_att_match,
    tdav_codec_h263_sdp_att_get
};
const tmedia_codec_plugin_def_t *tdav_codec_h263_plugin_def_t = &tdav_codec_h263_plugin_def_s;























/* ============ H.263-1998 Plugin interface ================= */

//
//	H.263-1998 object definition
//

static tsk_size_t tdav_codec_h263p_decode(tmedia_codec_t* self, const void* in_data, tsk_size_t in_size, void** out_data, tsk_size_t* out_max_size, const tsk_object_t* proto_hdr)
{
    uint8_t P, V, PLEN, PEBIT;
    uint8_t* pdata = (uint8_t*)in_data;
    const uint8_t* pay_ptr;
    tsk_size_t pay_size;
    int hdr_size = H263P_HEADER_SIZE;
    tsk_size_t xsize, retsize = 0;
    int got_picture_ptr;
    int ret;

    tdav_codec_h263_t* h263 = (tdav_codec_h263_t*)self;
    const trtp_rtp_header_t* rtp_hdr = proto_hdr;

    if(!self || !in_data || !in_size || ((int)in_size <= hdr_size) || !out_data || !h263->decoder.context) {
        TSK_DEBUG_ERROR("Invalid parameter");
        return 0;
    }

    /*
    	rfc4629 - 5.1.  General H.263+ Payload Header

             0                   1
             0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
            +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
            |   RR    |P|V|   PLEN    |PEBIT|
            +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    */
    P = (pdata[0] & 0x04)>>2;
    V = (pdata[0] & 0x02)>>1;
    PLEN = (((pdata[0] & 0x01)<<5) | pdata[1]>>3);
    PEBIT = pdata[1] & 0x07;

    if(V) {
        /*
        	Indicates the presence of an 8-bit field containing information
        	for Video Redundancy Coding (VRC), which follows immediately after
        	the initial 16 bits of the payload header, if present.  For syntax
        	and semantics of that 8-bit VRC field, see Section 5.2.
        */
    }
    if(PLEN) {
        /*
        	Length, in bytes, of the extra picture header.  If no extra
        	picture header is attached, PLEN is 0.  If PLEN>0, the extra
        	picture header is attached immediately following the rest of the
        	payload header.  Note that the length reflects the omission of the
        	first two bytes of the picture start code (PSC).  See Section 6.1.
        */
        hdr_size += PLEN;
        if(PEBIT) {
            /*
            	Indicates the number of bits that shall be ignored in the last
            	byte of the picture header.  If PLEN is not zero, the ignored bits
            	shall be the least significant bits of the byte.  If PLEN is zero,
            	then PEBIT shall also be zero.
            */
            TSK_DEBUG_WARN("PEBIT ignored");
        }
    }
    if(P) { /* MUST be done after PLEN and PEBIT */
        /*
        	Indicates the picture start or a picture segment (GOB/Slice) start
        	or a video sequence end (EOS or EOSBS).  Two bytes of zero bits
        	then have to be prefixed to the payload of such a packet to
        	compose a complete picture/GOB/slice/EOS/EOSBS start code.  This
        	bit allows the omission of the two first bytes of the start codes,
        	thus improving the compression ratio.
        */
        hdr_size -= 2;
        pdata[hdr_size] = 0x00, pdata[hdr_size + 1] = 0x00;
    }

    pay_ptr = (pdata + hdr_size);
    pay_size = (in_size - hdr_size);
    xsize = avpicture_get_size(h263->decoder.context->pix_fmt, h263->decoder.context->width, h263->decoder.context->height);

    /* Packet lost? */
    if(h263->decoder.last_seq != (rtp_hdr->seq_num - 1) && h263->decoder.last_seq) {
        if(h263->decoder.last_seq == rtp_hdr->seq_num) {
            // Could happen on some stupid emulators
            //TSK_DEBUG_INFO("Packet duplicated, seq_num=%d", rtp_hdr->seq_num);
            return 0;
        }
        TSK_DEBUG_INFO("[H.263+] Packet loss, seq_num=%d", rtp_hdr->seq_num);
    }
    h263->decoder.last_seq = rtp_hdr->seq_num;

    if((int)(h263->decoder.accumulator_pos + pay_size) <= xsize) {
        /* PEBIT is ignored */
        memcpy(&((uint8_t*)h263->decoder.accumulator)[h263->decoder.accumulator_pos], pay_ptr, pay_size);
        h263->decoder.accumulator_pos += pay_size;
    }
    else {
        TSK_DEBUG_WARN("Buffer overflow");
        h263->decoder.accumulator_pos = 0;
        return 0;
    }

    if(rtp_hdr->marker) {
        AVPacket packet;
        /* allocate destination buffer */
        if(*out_max_size < xsize) {
            if(!(*out_data = tsk_realloc(*out_data, xsize))) {
                TSK_DEBUG_ERROR("Failed to allocate new buffer");
                *out_max_size = 0;
                h263->decoder.accumulator_pos = 0;
                return 0;
            }
            *out_max_size = xsize;
        }

        /* decode the picture */
        av_init_packet(&packet);
        packet.size = (int)h263->decoder.accumulator_pos;
        packet.data = h263->decoder.accumulator;
        ret = avcodec_decode_video2(h263->decoder.context, h263->decoder.picture, &got_picture_ptr, &packet);

        if(ret <0 || !got_picture_ptr) {
            TSK_DEBUG_WARN("Failed to decode the buffer");
        }
        else {
            retsize = xsize;
            TMEDIA_CODEC_VIDEO(h263)->in.width = h263->decoder.context->width;
            TMEDIA_CODEC_VIDEO(h263)->in.height = h263->decoder.context->height;
            /* copy picture into a linear buffer */
            avpicture_layout((AVPicture *)h263->decoder.picture, h263->decoder.context->pix_fmt, (int)h263->decoder.context->width, (int)h263->decoder.context->height,
                             *out_data, (int)retsize);
        }
        /* in all cases: reset accumulator */
        h263->decoder.accumulator_pos = 0;
    }

    return retsize;
}

/* constructor */
static tsk_object_t* tdav_codec_h263p_ctor(tsk_object_t * self, va_list * app)
{
    tdav_codec_h263p_t *h263p = self;
    if(h263p) {
        /* init base: called by tmedia_codec_create() */
        /* init self */
        tdav_codec_h263_init(TDAV_CODEC_H263(self), tdav_codec_h263_1998, CODEC_ID_H263P, CODEC_ID_H263);
    }
    return self;
}
/* destructor */
static tsk_object_t* tdav_codec_h263p_dtor(tsk_object_t * self)
{
    tdav_codec_h263p_t *h263p = self;
    if(h263p) {
        /* deinit base */
        tmedia_codec_video_deinit(h263p);
        /* deinit self */
        tdav_codec_h263_deinit(TDAV_CODEC_H263(self));
    }

    return self;
}
/* object definition */
static const tsk_object_def_t tdav_codec_h263p_def_s = {
    sizeof(tdav_codec_h263p_t),
    tdav_codec_h263p_ctor,
    tdav_codec_h263p_dtor,
    tmedia_codec_cmp,
};
/* plugin definition*/
static const tmedia_codec_plugin_def_t tdav_codec_h263p_plugin_def_s = {
    &tdav_codec_h263p_def_s,

    tmedia_video,
    tmedia_codec_id_h263p,
    "H263-1998",
    "H263-1998 codec (FFmpeg)",
    TMEDIA_CODEC_FORMAT_H263_1998,
    tsk_true,
    90000, // rate

    /* audio */
    { 0 },

    /* video (width, height, fps) */
    {176, 144, 0},// fps is @deprecated

    tdav_codec_h263p_set,
    tdav_codec_h263p_open,
    tdav_codec_h263p_close,
    tdav_codec_h263p_encode,
    tdav_codec_h263p_decode,
    tdav_codec_h263p_sdp_att_match,
    tdav_codec_h263p_sdp_att_get
};
const tmedia_codec_plugin_def_t *tdav_codec_h263p_plugin_def_t = &tdav_codec_h263p_plugin_def_s;














/* ============ H.263-2000 Plugin interface ================= */

//
//	H.263-2000 object definition
//

/* constructor */
static tsk_object_t* tdav_codec_h263pp_ctor(tsk_object_t * self, va_list * app)
{
    tdav_codec_h263pp_t *h263pp = self;
    if(h263pp) {
        /* init base: called by tmedia_codec_create() */
        /* init self */
        tdav_codec_h263_init(TDAV_CODEC_H263(self), tdav_codec_h263_2000, CODEC_ID_H263P, CODEC_ID_H263);
    }
    return self;
}
/* destructor */
static tsk_object_t* tdav_codec_h263pp_dtor(tsk_object_t * self)
{
    tdav_codec_h263pp_t *h263pp = self;
    if(h263pp) {
        /* deinit base */
        tmedia_codec_video_deinit(h263pp);
        /* deinit self */
        tdav_codec_h263_deinit(TDAV_CODEC_H263(self));
    }

    return self;
}
/* object definition */
static const tsk_object_def_t tdav_codec_h263pp_def_s = {
    sizeof(tdav_codec_h263pp_t),
    tdav_codec_h263pp_ctor,
    tdav_codec_h263pp_dtor,
    tmedia_codec_cmp,
};
/* plugin definition*/
static const tmedia_codec_plugin_def_t tdav_codec_h263pp_plugin_def_s = {
    &tdav_codec_h263pp_def_s,

    tmedia_video,
    tmedia_codec_id_h263pp,
    "H263-2000",
    "H263-2000 codec (FFmpeg)",
    TMEDIA_CODEC_FORMAT_H263_2000,
    tsk_true,
    90000, // rate

    /* audio */
    { 0 },

    /* video (width, height, fps)*/
    {176, 144, 0},// fps is @deprecated

    tdav_codec_h263pp_set,
    tdav_codec_h263pp_open,
    tdav_codec_h263pp_close,
    tdav_codec_h263pp_encode,
    tdav_codec_h263pp_decode,
    tdav_codec_h263pp_sdp_att_match,
    tdav_codec_h263pp_sdp_att_get
};
const tmedia_codec_plugin_def_t *tdav_codec_h263pp_plugin_def_t = &tdav_codec_h263pp_plugin_def_s;



int tdav_codec_h263_open_encoder(tdav_codec_h263_t* self)
{
    int ret;
    int size;
    int32_t max_bw_kpbs;
    if(self->encoder.context) {
        TSK_DEBUG_ERROR("Encoder already opened");
        return -1;
    }

    self->encoder.context = avcodec_alloc_context();
    avcodec_get_context_defaults(self->encoder.context);

    self->encoder.context->pix_fmt		= PIX_FMT_YUV420P;
    self->encoder.context->time_base.num  = 1;
    self->encoder.context->time_base.den  = TMEDIA_CODEC_VIDEO(self)->out.fps;
    self->encoder.context->width = TMEDIA_CODEC_VIDEO(self)->out.width;
    self->encoder.context->height = TMEDIA_CODEC_VIDEO(self)->out.height;

    self->encoder.context->qmin = 10;
    self->encoder.context->qmax = 51;
#if LIBAVCODEC_VERSION_MAJOR <= 53
    self->encoder.context->mb_qmin = self->encoder.context->qmin;
    self->encoder.context->mb_qmax = self->encoder.context->qmax;
#endif
    self->encoder.context->mb_decision = FF_MB_DECISION_RD;
    max_bw_kpbs = TSK_CLAMP(
                      0,
                      tmedia_get_video_bandwidth_kbps_2(TMEDIA_CODEC_VIDEO(self)->out.width, TMEDIA_CODEC_VIDEO(self)->out.height, TMEDIA_CODEC_VIDEO(self)->out.fps),
                      self->encoder.max_bw_kpbs
                  );
    self->encoder.context->bit_rate = (max_bw_kpbs * 1024);// bps
    //self->encoder.context->rc_lookahead = 0;
    self->encoder.context->rtp_payload_size = RTP_PAYLOAD_SIZE;
    self->encoder.context->opaque = tsk_null;
    self->encoder.context->gop_size = (TMEDIA_CODEC_VIDEO(self)->out.fps * TDAV_H263_GOP_SIZE_IN_SECONDS);
    self->encoder.context->flags |= CODEC_FLAG_QSCALE;
    self->encoder.context->global_quality = FF_QP2LAMBDA * self->encoder.quality;
    self->encoder.context->max_b_frames = 0;

    // Picture (YUV 420)
    if(!(self->encoder.picture = avcodec_alloc_frame())) {
        TSK_DEBUG_ERROR("Failed to create encoder picture");
        return -2;
    }
    avcodec_get_frame_defaults(self->encoder.picture);
    //if((ret = avpicture_alloc((AVPicture*)self->encoder.picture, PIX_FMT_YUV420P, self->encoder.context->width, self->encoder.context->height))){
    //	TSK_DEBUG_ERROR("Failed to allocate encoder picture");
    //	return ret;
    //}

    size = avpicture_get_size(PIX_FMT_YUV420P, self->encoder.context->width, self->encoder.context->height);
    if(!(self->encoder.buffer = tsk_calloc(size, sizeof(uint8_t)))) {
        TSK_DEBUG_ERROR("Failed to allocate encoder buffer");
        return -2;
    }


    // RTP Callback
    switch(self->type) {
    case tdav_codec_h263_1996: {
        // H263 - 1996
        break;
    }
    case tdav_codec_h263_1998: {
        // H263 - 1998
#if defined(CODEC_FLAG_H263P_UMV)
        self->encoder.context->flags |= CODEC_FLAG_H263P_UMV;		// Annex D+
#endif
        self->encoder.context->flags |= CODEC_FLAG_AC_PRED;			// Annex I and T
        self->encoder.context->flags |= CODEC_FLAG_LOOP_FILTER;		// Annex J
#if defined(CODEC_FLAG_H263P_SLICE_STRUCT)
        self->encoder.context->flags |= CODEC_FLAG_H263P_SLICE_STRUCT;	// Annex K
#endif
#if defined(CODEC_FLAG_H263P_AIV)
        self->encoder.context->flags |= CODEC_FLAG_H263P_AIV;			// Annex S
#endif
        break;
    }
    case tdav_codec_h263_2000: {
        // H263 - 2000
#if defined(CODEC_FLAG_H263P_UMV)
        self->encoder.context->flags |= CODEC_FLAG_H263P_UMV;		// Annex D+
#endif
        self->encoder.context->flags |= CODEC_FLAG_AC_PRED;			// Annex I and T
        self->encoder.context->flags |= CODEC_FLAG_LOOP_FILTER;		// Annex J
#if defined(CODEC_FLAG_H263P_SLICE_STRUCT)
        self->encoder.context->flags |= CODEC_FLAG_H263P_SLICE_STRUCT;	// Annex K
#endif
#if defined(CODEC_FLAG_H263P_AIV)
        self->encoder.context->flags |= CODEC_FLAG_H263P_AIV;			// Annex S
#endif
        break;
    }
    }
    // Open encoder
    if((ret = avcodec_open(self->encoder.context, self->encoder.codec)) < 0) {
        TSK_DEBUG_ERROR("Failed to open [%s] codec", TMEDIA_CODEC(self)->plugin->desc);
        return ret;
    }

    TSK_DEBUG_INFO("[H.263] bitrate=%d bps", self->encoder.context->bit_rate);

    return ret;
}

int tdav_codec_h263_open_decoder(tdav_codec_h263_t* self)
{
    int ret, size;

    if(self->decoder.context) {
        TSK_DEBUG_ERROR("Decoder already opened");
        return -1;
    }

    self->decoder.context = avcodec_alloc_context();
    avcodec_get_context_defaults(self->decoder.context);

    self->decoder.context->pix_fmt = PIX_FMT_YUV420P;
    self->decoder.context->width = TMEDIA_CODEC_VIDEO(self)->in.width;
    self->decoder.context->height = TMEDIA_CODEC_VIDEO(self)->in.height;

    // Picture (YUV 420)
    if(!(self->decoder.picture = avcodec_alloc_frame())) {
        TSK_DEBUG_ERROR("Failed to create decoder picture");
        return -2;
    }
    avcodec_get_frame_defaults(self->decoder.picture);

    size = avpicture_get_size(PIX_FMT_YUV420P, self->decoder.context->width, self->decoder.context->height);
    if(!(self->decoder.accumulator = tsk_calloc((size + FF_INPUT_BUFFER_PADDING_SIZE), sizeof(uint8_t)))) {
        TSK_DEBUG_ERROR("Failed to allocate decoder buffer");
        return -2;
    }

    // Open decoder
    if((ret = avcodec_open(self->decoder.context, self->decoder.codec)) < 0) {
        TSK_DEBUG_ERROR("Failed to open [%s] codec", TMEDIA_CODEC(self)->plugin->desc);
        return ret;
    }

    self->decoder.last_seq = 0;

    return ret;
}

int tdav_codec_h263_close_encoder(tdav_codec_h263_t* self)
{
    if(self->encoder.context) {
        avcodec_close(self->encoder.context);
        av_free(self->encoder.context);
        self->encoder.context = tsk_null;
    }
    if(self->encoder.picture) {
        av_free(self->encoder.picture);
        self->encoder.picture = tsk_null;
    }
    if(self->encoder.buffer) {
        TSK_FREE(self->encoder.buffer);
    }
    return 0;
}

int tdav_codec_h263_close_decoder(tdav_codec_h263_t* self)
{
    if(self->decoder.context) {
        avcodec_close(self->decoder.context);
        av_free(self->decoder.context);
        self->decoder.context = tsk_null;
    }
    if(self->decoder.picture) {
        av_free(self->decoder.picture);
        self->decoder.picture = tsk_null;
    }
    if(self->decoder.accumulator) {
        TSK_FREE(self->decoder.accumulator);
        self->decoder.accumulator_pos = 0;
    }
    return 0;
}

/* ============ Callbacks ================= */

static void tdav_codec_h263_encap(const tdav_codec_h263_t* h263, const uint8_t* pdata, tsk_size_t size)
{
    tsk_bool_t frag = tsk_false;
    register uint32_t i, last_index = 0;

    if(size < RTP_PAYLOAD_SIZE) {
        goto last;
    }

    for(i = 4; i<(size - 4); i++) {
        if(pdata[i] == 0x00 && pdata[i+1] == 0x00 && pdata[i+2]>=0x80) { /* PSC or (GBSC) found */
            if((i - last_index) >= RTP_PAYLOAD_SIZE || tsk_true/* FIXME */) {
                switch(h263->type) {
                case tdav_codec_h263_1996:
                    tdav_codec_h263_rtp_callback((tdav_codec_h263_t*) h263, pdata+last_index,
                                                 (i - last_index), (last_index == size));
                    break;
                default:
                    tdav_codec_h263p_rtp_callback((tdav_codec_h263_t*) h263, pdata + last_index,
                                                  (i - last_index), frag, (last_index == size));
                    frag = tsk_true;
                    break;
                }
                last_index = i;
            }
        }
    }
last:
    if(last_index < size) {
        switch(h263->type) {
        case tdav_codec_h263_1996:
            tdav_codec_h263_rtp_callback((tdav_codec_h263_t*) h263, pdata + last_index,
                                         (size - last_index), tsk_true);
            break;
        default:
            tdav_codec_h263p_rtp_callback((tdav_codec_h263_t*) h263, pdata + last_index,
                                          (size - last_index), frag, tsk_true);
            break;
        }
    }
}


static void tdav_codec_h263_rtp_callback(tdav_codec_h263_t *self, const void *data, tsk_size_t size, tsk_bool_t marker)
{
    uint8_t* pdata = (uint8_t*)data;

    if(self->rtp.size < (size + H263_HEADER_MODE_A_SIZE)) {
        if(!(self->rtp.ptr = tsk_realloc(self->rtp.ptr, (size + H263_HEADER_MODE_A_SIZE)))) {
            TSK_DEBUG_ERROR("Failed to allocate new buffer");
            return;
        }
        self->rtp.size = (size + H263_HEADER_MODE_A_SIZE);
    }
    memcpy((self->rtp.ptr + H263_HEADER_MODE_A_SIZE), data, size);

    /* http://eu.sabotage.org/www/ITU/H/H0263e.pdf section 5.1
    * 5.1.1 Picture Start Code (PSC) (22 bits) - PSC is a word of 22 bits. Its value is 0000 0000 0000 0000 1 00000.

    *
    * 5.1.1 Picture Start Code (PSC) (22 bits)
    * 5.1.2 Temporal Reference (TR) (8 bits)
    * 5.1.3 Type Information (PTYPE) (Variable Length)
    *	 Bit 1: Always "1", in order to avoid start code emulation.
    *	 Bit 2: Always "0", for distinction with Recommendation H.261.

    *	 Bit 3: Split screen indicator, "0" off, "1" on.
    *	 Bit 4: Document camera indicator, "0" off, "1" on.
    *	 Bit 5: Full Picture Freeze Release, "0" off, "1" on.
    *	 Bits 6-8: Source Format, "000" forbidden, "001" sub-QCIF, "010" QCIF, "011" CIF,
    	"100" 4CIF, "101" 16CIF, "110" reserved, "111" extended PTYPE.
    	If bits 6-8 are not equal to "111", which indicates an extended PTYPE (PLUSPTYPE), the following
    	five bits are also present in PTYPE:
    	 Bit 9: Picture Coding Type, "0" INTRA (I-picture), "1" INTER (P-picture).
    	 Bit 10: Optional Unrestricted Motion Vector mode (see Annex D), "0" off, "1" on.
    	 Bit 11: Optional Syntax-based Arithmetic Coding mode (see Annex E), "0" off, "1" on.
    	 Bit 12: Optional Advanced Prediction mode (see Annex F), "0" off, "1" on.
    	 Bit 13: Optional PB-frames mode (see Annex G), "0" normal I- or P-picture, "1" PB-frame.
    */
    if(pdata[0] == 0x00 && pdata[1] == 0x00 && (pdata[2] & 0xfc)==0x80) { /* PSC */
        /* RFC 2190 -5.1 Mode A
        	0                   1                   2                   3
        	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
        	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        	|F|P|SBIT |EBIT | SRC |I|U|S|A|R      |DBQ| TRB |    TR         |
        	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

        SRC : 3 bits
        Source format, bit 6,7 and 8 in PTYPE defined by H.263 [4], specifies
        the resolution of the current picture.

        I:  1 bit.
        Picture coding type, bit 9 in PTYPE defined by H.263[4], "0" is
        intra-coded, "1" is inter-coded.
        */

        // PDATA[4] ======> Bits 3-10 of PTYPE
        uint32_t rtp_hdr = 0;
        uint8_t format, pict_type;

        // Source Format = 4,5,6
        format = (pdata[4] & 0x3C)>>2;
        // Picture Coding Type = 7
        pict_type = (pdata[4] & 0x02)>>1;
        // RTP mode A header
        ((uint8_t*)&rtp_hdr)[1] = (format <<5) | (pict_type << 4);
        //rtp_hdr = tnet_htonl(rtp_hdr);
        memcpy(self->rtp.ptr, &rtp_hdr, sizeof(rtp_hdr));
    }

    // Send data over the network
    if(TMEDIA_CODEC_VIDEO(self)->out.callback) {
        TMEDIA_CODEC_VIDEO(self)->out.result.buffer.ptr = self->rtp.ptr;
        TMEDIA_CODEC_VIDEO(self)->out.result.buffer.size = (size + H263_HEADER_MODE_A_SIZE);
        TMEDIA_CODEC_VIDEO(self)->out.result.duration =  (uint32_t)((1./(double)TMEDIA_CODEC_VIDEO(self)->out.fps) * TMEDIA_CODEC(self)->plugin->rate);
        TMEDIA_CODEC_VIDEO(self)->out.result.last_chunck = marker;
        TMEDIA_CODEC_VIDEO(self)->out.callback(&TMEDIA_CODEC_VIDEO(self)->out.result);
    }
}

static void tdav_codec_h263p_rtp_callback(tdav_codec_h263_t *self, const void *data, tsk_size_t size, tsk_bool_t frag, tsk_bool_t marker)
{
    uint8_t* pdata = (uint8_t*)data;
    //uint8_t rtp_hdr[2] = {0x00, 0x00};
    //tsk_bool_t eos = tsk_false;

    const void* _ptr = tsk_null;
    tsk_size_t _size = 0;
    //static tsk_bool_t frag = tsk_false;
    //tsk_bool_t found_gob = tsk_false;

    /* RFC 4629 - 5.1. General H.263+ Payload Header
    	The H.263+ payload header is structured as follows:
         0                   1
         0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |   RR    |P|V|   PLEN    |PEBIT|
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    */

    /* http://eu.sabotage.org/www/ITU/H/H0263e.pdf
    *
    * 5.1.1 Picture Start Code (PSC) (22 bits)
    *	->PSC is a word of 22 bits. Its value is 0000 0000 0000 0000 1 00000.
    * 5.1.27 End Of Sequence (EOS) (22 bits)
    *	->A codeword of 22 bits. Its value is 0000 0000 0000 0000 1 11111
    * 5.2.2 Group of Block Start Code (GBSC) (17 bits)
    *	->A word of 17 bits. Its value is 0000 0000 0000 0000 1
    * C.4.1 End Of Sub-Bitstream code (EOSBS) (23 bits)
    *	->The EOSBS code is a codeword of 23 bits. Its value is 0000 0000 0000 0000 1 11110 0
    *
    *
    * 5.2.3 Group Number (GN) (5 bits)
    *	-> last 5 bits
    */
    //if(pdata[0] == 0x00 && pdata[1] == 0x00 && pdata[2] >= 0x80){ /* PSC or EOS or GBSC */
    //	uint8_t GN = ((pdata[2]>>2) & 0x1F);
    //	found_gob = tsk_true;
    //	//TSK_DEBUG_INFO("GN=%u", pdata[2]);
    //
    //	/*	RFC 4629 - 6.1.1. Packets that begin with a Picture Start Code
    //		A packet that begins at the location of a Picture, GOB, slice, EOS,
    //		or EOSBS start code shall omit the first two (all zero) bytes from
    //		the H.263+ bitstream and signify their presence by setting P=1 in the
    //		payload header.
    //	*/

    //	if(GN == 0x00){ /* PSC 00000 */
    //		/* Use the two first bytes as RTP header */
    //		//pdata[0] |= 0x04; // P=1

    //		/*
    //		 0                   1                   2                   3
    //		0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    //		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    //		|   RR    |1|V|0|0|0|0|0|0|0|0|0| bitstream data without the    :
    //		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    //		: first two 0 bytes of the PSC
    //		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    //		*/

    //		//TSK_DEBUG_INFO("H263 - PSC");
    //	}
    //	else if(GN == 0x1F){ /* EOS 11111 */
    //		/* Use the two first bytes as RTP header */
    //		//pdata[0] |= 0x04; // P=1
    //		eos = tsk_true;
    //		/* RFC 4629 - 6.1.3. Packets that begin with an EOS or EOSBS Code
    //			0                   1                   2
    //			0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
    //			+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    //			|   RR    |1|V|0|0|0|0|0|0|0|0|0|1|1|1|1|1|1|0|0|
    //			+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    //		*/
    //		//TSK_DEBUG_INFO("H263 - EOS");
    //	}
    //	else /*if((GN >> 4) == 0x01)*/{ /* GBSC  10000 */
    //		/* Use the two first bytes as RTP header */
    //		//pdata[0] |= 0x04; // P=1
    //
    //		/* RFC 4629 - 6.1.2. Packets that begin with GBSC or SSC
    //	0                   1                   2                   3
    //	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    //	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    //	|   RR    |1|V|0 0 1 0 0 1|PEBIT|1 0 0 0 0 0| picture header    :
    //	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    //	: starting with TR, PTYPE ...                                   |
    //	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    //	| ...                                           | bitstream     :
    //	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    //	: data starting with GBSC/SSC without its first two 0 bytes
    //	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    //		*/
    //		//TSK_DEBUG_INFO("H263 - GBSC");
    //		found_gob = tsk_false;
    //	}
    //	//else if(EOSBS) -> Not Supported
    //}
    //else{
    //	/* 6.2. Encapsulating Follow-on Packet (P=0) */
    //	int i = 0;
    //	i++;
    //}

    //if(/*eos*/!found_gob && frag){
    //	if(self->rtp.size < (size + 2/* H263+ Header size */)){
    //		if(!(self->rtp.ptr = tsk_realloc(self->rtp.ptr, (size + 2)))){
    //			TSK_DEBUG_ERROR("Failed to allocate new buffer");
    //			return;
    //		}
    //		self->rtp.size = (size + 2);
    //	}
    //	/* RFC 4629 - 6. Packetization Schemes */
    //	//rtp_hdr[0] |= 0x00;
    //	//memcpy(self->rtp.ptr, rtp_hdr/* zeros-> is it corretc? */, 2);
    //	//memcpy((self->rtp.ptr + 2), pdata, size);
    //	//_ptr = self->rtp.ptr;
    //	//_size = (size + 2);

    //	pdata[0] |= pdata[2] > 0x80 ? 0x04 : 0x04;
    //	_ptr = pdata;
    //	_size = size;
    //}
    //else{
    //	pdata[0] |= pdata[2] > 0x80 ? 0x04 : 0x04;
    //	_ptr = pdata;
    //	_size = size;
    //}

// FIXME
    pdata[0] |= pdata[2] > 0x80 ? 0x04 : 0x04;
    _ptr = pdata;
    _size = size;


    // Send data over the network
    if(TMEDIA_CODEC_VIDEO(self)->out.callback) {
        TMEDIA_CODEC_VIDEO(self)->out.result.buffer.ptr = _ptr;
        TMEDIA_CODEC_VIDEO(self)->out.result.buffer.size = _size;
        TMEDIA_CODEC_VIDEO(self)->out.result.duration =  (uint32_t)((1./(double)TMEDIA_CODEC_VIDEO(self)->out.fps) * TMEDIA_CODEC(self)->plugin->rate);
        TMEDIA_CODEC_VIDEO(self)->out.result.last_chunck = marker;
        TMEDIA_CODEC_VIDEO(self)->out.callback(&TMEDIA_CODEC_VIDEO(self)->out.result);
    }
}

tsk_bool_t tdav_codec_ffmpeg_h263_is_supported()
{
    return (avcodec_find_encoder(CODEC_ID_H263) && avcodec_find_decoder(CODEC_ID_H263));
}

tsk_bool_t tdav_codec_ffmpeg_h263p_is_supported()
{
    return (avcodec_find_encoder(CODEC_ID_H263P) && avcodec_find_decoder(CODEC_ID_H263));
}

tsk_bool_t tdav_codec_ffmpeg_h263pp_is_supported()
{
    return tdav_codec_ffmpeg_h263p_is_supported();
}


#endif /* HAVE_FFMPEG */
OpenPOWER on IntegriCloud