forked from iizukanao/node-rtsp-rtmp-server
-
Notifications
You must be signed in to change notification settings - Fork 0
/
h264.coffee
1066 lines (963 loc) · 35.5 KB
/
h264.coffee
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
# H.264 parser
#
# H.264 spec is freely available at http://www.itu.int/rec/T-REC-H.264
fs = require 'fs'
Bits = require './bits'
logger = require './logger'
videoBuf = null
pps = {}
sps = {}
ASPECT_RATIO_IDC_EXTENDED_SAR = 255 # Extended_SAR
SUB_WIDTHS =
# 'chroma_format_idc,separate_colour_plane_flag': [SubWidthC, SubHeightC]
'1,0': [2, 2]
'2,0': [2, 1]
'3,0': [1, 1]
# rangeTabLPS
RANGE_TAB_LPS = [
[ 128, 176, 208, 240 ]
[ 128, 167, 197, 227 ]
[ 128, 158, 187, 216 ]
[ 123, 150, 178, 205 ]
[ 116, 142, 169, 195 ]
[ 111, 135, 160, 185 ]
[ 105, 128, 152, 175 ]
[ 100, 122, 144, 166 ]
[ 95, 116, 137, 158 ]
[ 90, 110, 130, 150 ]
[ 85, 104, 123, 142 ]
[ 81, 99, 117, 135 ]
[ 77, 94, 111, 128 ]
[ 73, 89, 105, 122 ]
[ 69, 85, 100, 116 ]
[ 66, 80, 95, 110 ]
[ 62, 76, 90, 104 ]
[ 59, 72, 86, 99 ]
[ 56, 69, 81, 94 ]
[ 53, 65, 77, 89 ]
[ 51, 62, 73, 85 ]
[ 48, 59, 69, 80 ]
[ 46, 56, 66, 76 ]
[ 43, 53, 63, 72 ]
[ 41, 50, 59, 69 ]
[ 39, 48, 56, 65 ]
[ 37, 45, 54, 62 ]
[ 35, 43, 51, 59 ]
[ 33, 41, 48, 56 ]
[ 32, 39, 46, 53 ]
[ 30, 37, 43, 50 ]
[ 29, 35, 41, 48 ]
[ 27, 33, 39, 45 ]
[ 26, 31, 37, 43 ]
[ 24, 30, 35, 41 ]
[ 23, 28, 33, 39 ]
[ 22, 27, 32, 37 ]
[ 21, 26, 30, 35 ]
[ 20, 24, 29, 33 ]
[ 19, 23, 27, 31 ]
[ 18, 22, 26, 30 ]
[ 17, 21, 25, 28 ]
[ 16, 20, 23, 27 ]
[ 15, 19, 22, 25 ]
[ 14, 18, 21, 24 ]
[ 14, 17, 20, 23 ]
[ 13, 16, 19, 22 ]
[ 12, 15, 18, 21 ]
[ 12, 14, 17, 20 ]
[ 11, 14, 16, 19 ]
[ 11, 13, 15, 18 ]
[ 10, 12, 15, 17 ]
[ 10, 12, 14, 16 ]
[ 9, 11, 13, 15 ]
[ 9, 11, 12, 14 ]
[ 8, 10, 12, 14 ]
[ 8, 9, 11, 13 ]
[ 7, 9, 11, 12 ]
[ 7, 9, 10, 12 ]
[ 7, 8, 10, 11 ]
[ 6, 8, 9, 11 ]
[ 6, 7, 9, 10 ]
[ 6, 7, 8, 9 ]
[ 2, 2, 2, 2 ]
]
# Name association to slice_type
SLICE_TYPES =
0: 'P'
1: 'B'
2: 'I'
3: 'SP'
4: 'SI'
5: 'P'
6: 'B'
7: 'I'
8: 'SP'
9: 'SI'
eventListeners = {}
lastPTS = null
lastDTS = null
dtsPackets = []
api =
NAL_UNIT_TYPE_NON_IDR_PICTURE: 1 # inter frame
NAL_UNIT_TYPE_IDR_PICTURE: 5 # key frame
NAL_UNIT_TYPE_SEI: 6 # SEI (supplemental enhancement information)
NAL_UNIT_TYPE_SPS: 7 # SPS (sequence parameter set)
NAL_UNIT_TYPE_PPS: 8 # PPS (picture parameter set)
NAL_UNIT_TYPE_ACCESS_UNIT_DELIMITER: 9 # access unit delimiter
open: (file) ->
videoBuf = fs.readFileSync file # up to 1GB
close: ->
videoBuf = null
emit: (name, data...) ->
if eventListeners[name]?
for listener in eventListeners[name]
listener data...
return
on: (name, listener) ->
if eventListeners[name]?
eventListeners[name].push listener
else
eventListeners[name] = [ listener ]
end: ->
@emit 'end'
# Assumes the last NAL unit in this buffer is in complete form
splitIntoNALUnits: (buffer) ->
nalUnits = []
loop
startCodePos = Bits.searchBytesInArray buffer, [0x00, 0x00, 0x01], 0
if startCodePos isnt -1
nalUnit = buffer[0...startCodePos]
buffer = buffer[startCodePos+3..]
else
nalUnit = buffer
# Remove trailing_zero_8bits
while nalUnit[nalUnit.length-1] is 0x00
nalUnit = nalUnit[0...nalUnit.length-1]
if nalUnit.length > 0
nalUnits.push nalUnit
if startCodePos is -1
break
return nalUnits
feedPESPacket: (pesPacket) ->
if videoBuf?
videoBuf = Buffer.concat [videoBuf, pesPacket.pes.data]
else
videoBuf = pesPacket.pes.data
pts = pesPacket.pes.PTS
dts = pesPacket.pes.DTS
nalUnits = []
loop
startCodePos = Bits.searchBytesInArray videoBuf, [0x00, 0x00, 0x01], 0
if startCodePos is -1
break
nalUnit = videoBuf[0...startCodePos]
videoBuf = videoBuf[startCodePos+3..]
# Remove trailing_zero_8bits
while nalUnit[nalUnit.length-1] is 0x00
nalUnit = nalUnit[0...nalUnit.length-1]
if nalUnit.length > 0
nalUnitType = nalUnit[0] & 0x1f
if nalUnitType is api.NAL_UNIT_TYPE_SPS
api.readSPS nalUnit
else if nalUnitType is api.NAL_UNIT_TYPE_PPS
api.readPPS nalUnit
else if nalUnitType is api.NAL_UNIT_TYPE_SEI
api.readSEI nalUnit
nalUnits.push nalUnit
if (dtsPackets.length > 0) and (pts isnt lastPTS)
dtsPackets.push nalUnit
@emit 'dts_nal_units', lastPTS, lastDTS, dtsPackets
dtsPackets = []
else
dtsPackets.push nalUnit
lastPTS = pts
lastDTS = dts
feed: (data) ->
if videoBuf?
videoBuf = Buffer.concat [videoBuf, data]
else
videoBuf = data
nalUnits = []
loop
startCodePos = Bits.searchBytesInArray videoBuf, [0x00, 0x00, 0x01], 0
if startCodePos is -1
break
nalUnit = videoBuf[0...startCodePos]
videoBuf = videoBuf[startCodePos+3..]
# Remove trailing_zero_8bits
while nalUnit[nalUnit.length-1] is 0x00
nalUnit = nalUnit[0...nalUnit.length-1]
if nalUnit.length > 0
nalUnitType = nalUnit[0] & 0x1f
if nalUnitType is api.NAL_UNIT_TYPE_SPS
api.readSPS nalUnit
else if nalUnitType is api.NAL_UNIT_TYPE_PPS
api.readPPS nalUnit
else if nalUnitType is api.NAL_UNIT_TYPE_SEI
api.readSEI nalUnit
nalUnits.push nalUnit
@emit 'nal_unit', nalUnit
if nalUnits.length > 0
@emit 'nal_units', nalUnits
hasMoreData: ->
return videoBuf? and (videoBuf.length > 0)
getNALUnitType: (nalUnit) ->
return nalUnit[0] & 0x1f
getSliceTypeString: (sliceType) ->
return SLICE_TYPES[sliceType]
isPictureNALUnitType: (nalUnitType) ->
return nalUnitType in [
api.NAL_UNIT_TYPE_NON_IDR_PICTURE,
api.NAL_UNIT_TYPE_IDR_PICTURE
]
getSPS: ->
return sps
getPPS: ->
return pps
readScalingList: (bits, scalingList, sizeOfScalingList, useDefaultScalingMatrixFlag) ->
lastScale = 8
nextScale = 8
for j in [0...sizeOfScalingList]
if nextScale isnt 0
delta_scale = bits.read_se()
nextScale = (lastScale + delta_scale + 256) % 256
useDefaultScalingMatrixFlag = ((j is 0) and (nextScale is 0))
scalingList[j] = if nextScale is 0 then lastScale else nextScale
lastScale = scalingList[j]
return
read_user_data_unregistered: (bits, payloadSize) ->
uuid_iso_iec_11578 = bits.read_bits 128
for i in [16...payloadSize]
user_data_payload_byte = bits.read_byte()
read_reserved_sei_message: (bits, payloadSize) ->
for i in [0...payloadSize]
reserved_sei_message_payload_byte = bits.read_byte()
read_sei_payload: (bits, payloadType, payloadSize) ->
# ignore contents
bits.read_bytes payloadSize
# TODO
# logger.debug "SEI: payloadType=#{payloadType} payloadSize=#{payloadSize}"
# switch payloadType
# when 0 then api.read_buffering_period payloadSize
# when 1 then api.read_pic_timing payloadSize
# when 2 then api.read_pan_scan_rect payloadSize
# when 3 then api.read_filler_payload payloadSize
# when 4 then api.read_user_data_registered_itu_t_t35 payloadSize
# when 5 then api.read_user_data_unregistered bits, payloadSize
# when 6 then api.read_recovery_point payloadSize
# when 7 then api.read_dec_ref_pic_marking_repetition payloadSize
# when 8 then api.read_spare_pic payloadSize
# when 9 then api.read_scene_info payloadSize
# when 10 then api.read_sub_seq_info payloadSize
# ...
# else api.read_reserved_sei_message bits, payloadSize
bits.read_until_byte_aligned()
read_sei_message: (bits) ->
payloadType = 0
while (byte = bits.read_byte()) is 0xff
payloadType += 255
last_payload_type_byte = byte
payloadType += last_payload_type_byte
payloadSize = 0
while (byte = bits.read_byte()) is 0xff
payloadSize += 255
last_payload_size_byte = byte
payloadSize += last_payload_size_byte
api.read_sei_payload(bits, payloadType, payloadSize)
readSEI: (nalUnit) ->
nalUnit = api.removeEmulationPreventionByte nalUnit
bits = new Bits nalUnit
api.read_nal_header bits
loop
api.read_sei_message bits
if not api.more_rbsp_data bits
break
return
readPPS: (nalUnit) ->
nalUnit = api.removeEmulationPreventionByte nalUnit
bits = new Bits nalUnit
api.read_nal_header bits
pic_parameter_set_id = bits.read_ue()
seq_parameter_set_id = bits.read_ue()
pps.entropy_coding_mode_flag = bits.read_bit()
pps.bottom_field_pic_order_in_frame_present_flag = bits.read_bit()
pps.num_slice_groups_minus1 = bits.read_ue()
if pps.num_slice_groups_minus1 > 0
slice_group_map_type = bits.read_ue()
if slice_group_map_type is 0
for iGroup in [0..pps.num_slice_groups_minus1]
run_length_minus1 = bits.read_ue()
else if slice_group_map_type is 2
for iGroup in [0...pps.num_slice_groups_minus1]
top_left = bits.read_ue()
bottom_right = bits.read_ue()
else if slice_group_map_type in [3, 4, 5]
slice_group_change_direction_flag = bits.read_bit()
pps.slice_group_change_rate_minus1 = bits.read_ue()
else if slice_group_map_type is 6
pic_size_in_map_units_minus1 = bits.read_ue()
for i in [0..pic_size_in_map_units_minus1]
# Ceil( Log2( num_slice_groups_minus1 + 1 ) )
numBits = Math.ceil(Math.log(pps.num_slice_groups_minus1 + 1) / Math.LN2)
slice_group_id = bits.read_bits(numBits)
pps.num_ref_idx_l0_default_active_minus1 = bits.read_ue()
pps.num_ref_idx_l1_default_active_minus1 = bits.read_ue()
pps.weighted_pred_flag = bits.read_bit()
pps.weighted_bipred_idc = bits.read_bits 2
pps.pic_init_qp_minus26 = bits.read_se()
pic_init_qs_minus26 = bits.read_se()
chroma_qp_index_offset = bits.read_se()
pps.deblocking_filter_control_present_flag = bits.read_bit()
constrained_intra_pred_flag = bits.read_bit()
pps.redundant_pic_cnt_present_flag = bits.read_bit()
if api.more_rbsp_data bits
transform_8x8_mode_flag = bits.read_bit()
pic_scaling_matrix_present_flag = bits.read_bit()
if pic_scaling_matrix_present_flag is 1
for i in [0...(6+(if sps.chroma_format_idc isnt 3 then 2 else 6)*transform_8x8_mode_flag)]
pic_scaling_list_present_flag = bits.read_bit()
if pic_scaling_list_present_flag
if i < 6
scalingList4x4 = []
useDefaultScalingMatrix4x4Flag = []
api.readScalingList(bits, scalingList4x4, 16,
useDefaultScalingMatrix4x4Flag)
else
scalingList8x8 = []
useDefaultScalingMatrix8x8Flag = []
api.readScalingList(bits, scalingList8x8, 64,
useDefaultScalingMatrix8x8Flag)
second_chroma_qp_index_offset = bits.read_se()
# rbsp_trailing_bits()
return
# Get width and height of video frame
# @param sps (object): SPS object
#
# @return {
# width (number) : width in pixels
# height (number): height in pixels
# }
getFrameSize: (sps) ->
if sps.chromaArrayType is 0
cropUnitX = 1
cropUnitY = 2 - sps.frame_mbs_only_flag
else
cropUnitX = sps.subWidthC
cropUnitY = sps.subHeightC * (2 - sps.frame_mbs_only_flag)
width = sps.picWidthInSamples -
(cropUnitX * sps.frame_crop_right_offset + 1) -
cropUnitX * sps.frame_crop_left_offset + 1
height = (16 * sps.frameHeightInMbs) -
(cropUnitY * sps.frame_crop_bottom_offset + 1) -
cropUnitY * sps.frame_crop_top_offset + 1
return {
width: width
height: height
}
getSubWidths: (sps) ->
return SUB_WIDTHS[sps.chroma_format_idc + ',' +
sps.separate_colour_plane_flag]
readSPS: (nalUnit) ->
sps = {}
nalUnit = api.removeEmulationPreventionByte nalUnit
bits = new Bits nalUnit
api.read_nal_header bits
sps.profile_idc = bits.read_byte()
sps.constraint_set0_flag = bits.read_bit()
sps.constraint_set1_flag = bits.read_bit()
sps.constraint_set2_flag = bits.read_bit()
sps.constraint_set3_flag = bits.read_bit()
sps.constraint_set4_flag = bits.read_bit()
sps.constraint_set5_flag = bits.read_bit()
reserved_zero_2bits = bits.read_bits 2
if reserved_zero_2bits isnt 0
throw new Error "video error: reserved_zero_2bits must be 00: #{reserved_zero_2bits}"
sps.level_idc = bits.read_byte()
seq_parameter_set_id = bits.read_ue()
if sps.profile_idc in [100, 110, 122, 244, 44, 83, 86, 118, 128]
sps.chroma_format_idc = bits.read_ue()
sps.chromaArrayType = sps.chroma_format_idc # default value
if sps.chroma_format_idc is 3
sps.separate_colour_plane_flag = bits.read_bit()
# Assign ChromaArrayType. See separate_colour_plane_flag
# for the definition of ChromaArrayType.
if sps.separate_colour_plane_flag is 1
sps.chromaArrayType = 0
else
sps.separate_colour_plane_flag = 0
bit_depth_luma_minus8 = bits.read_ue()
bit_depth_chroma_minus8 = bits.read_ue()
qpprime_y_zero_transform_bypass_flag = bits.read_bit()
seq_scaling_matrix_present_flag = bits.read_bit()
if seq_scaling_matrix_present_flag
for i in [0...(if sps.chroma_format_idc isnt 3 then 8 else 12)]
seq_scaling_list_present_flag = bits.read_bit()
if seq_scaling_list_present_flag
if i < 6
scalingList4x4 = []
useDefaultScalingMatrix4x4Flag = []
api.readScalingList(bits, scalingList4x4, 16,
useDefaultScalingMatrix4x4Flag)
else
scalingList8x8 = []
useDefaultScalingMatrix8x8Flag = []
api.readScalingList(bits, scalingList8x8, 64,
useDefaultScalingMatrix8x8Flag)
else
sps.chromaArrayType = sps.chroma_format_idc = 1 # 4:2:0 chroma format
sps.separate_colour_plane_flag = 0
subWidths = api.getSubWidths sps
if subWidths?
sps.subWidthC = subWidths[0]
sps.subHeightC = subWidths[1]
sps.log2_max_frame_num_minus4 = bits.read_ue()
sps.pic_order_cnt_type = bits.read_ue()
if sps.pic_order_cnt_type is 0
sps.log2_max_pic_order_cnt_lsb_minus4 = bits.read_ue()
else if sps.pic_order_cnt_type is 1
delta_pic_order_always_zero_flag = bits.read_bit()
offset_for_non_ref_pic = bits.read_se()
offset_for_top_to_bottom_field = bits.read_se()
num_ref_frames_in_pic_order_cnt_cycle = bits.read_ue()
for i in [0...num_ref_frames_in_pic_order_cnt_cycle]
offset_for_ref_frame = bits.read_se()
sps.max_num_ref_frames = bits.read_ue()
gaps_in_frame_num_value_allowed_flag = bits.read_bit()
sps.pic_width_in_mbs_minus1 = bits.read_ue()
sps.pic_height_in_map_units_minus1 = bits.read_ue()
sps.picWidthInMbs = sps.pic_width_in_mbs_minus1 + 1
sps.picWidthInSamples = sps.picWidthInMbs * 16
sps.picHeightInMapUnits = sps.pic_height_in_map_units_minus1 + 1
sps.picSizeInMapUnits = sps.picWidthInMbs * sps.picHeightInMapUnits
sps.frame_mbs_only_flag = bits.read_bit()
sps.frameHeightInMbs = (2 - sps.frame_mbs_only_flag) * sps.picHeightInMapUnits
if not sps.frame_mbs_only_flag
sps.mb_adaptive_frame_field_flag = bits.read_bit()
direct_8x8_inference_flag = bits.read_bit()
frame_cropping_flag = bits.read_bit()
if frame_cropping_flag
sps.frame_crop_left_offset = bits.read_ue()
sps.frame_crop_right_offset = bits.read_ue()
sps.frame_crop_top_offset = bits.read_ue()
sps.frame_crop_bottom_offset = bits.read_ue()
else
sps.frame_crop_left_offset = 0
sps.frame_crop_right_offset = 0
sps.frame_crop_top_offset = 0
sps.frame_crop_bottom_offset = 0
vui_parameters_present_flag = bits.read_bit()
if vui_parameters_present_flag
api.read_vui_parameters bits
# rbsp_trailing_bits
rbsp_stop_one_bit = bits.read_bit()
if rbsp_stop_one_bit isnt 1
logger.warn "warn: malformed SPS data: rbsp_stop_one_bit must be 1"
zero_bits_sum = bits.read_until_byte_aligned()
if zero_bits_sum isnt 0
logger.warn "warn: malformed SPS data: rbsp_alignment_zero_bit must be all zeroes"
if bits.get_remaining_bits() isnt 0
logger.warn "warn: malformed SPS length"
return sps
read_slice_data: (bits, opts) ->
if pps.entropy_coding_mode_flag
bits.read_until_byte_aligned() # cabac_alignment_one_bit
currMbAddr = opts.sliceHeader.first_mb_in_slice * (1 + opts.sliceHeader.mbaffFrameFlag)
moreDataFlag = 1
prevMbSkipped = 0
sliceTypeString = api.getSliceTypeString opts.sliceHeader.slice_type
# loop
# if sliceTypeString not in ['I', 'SI']
# if not pps.entropy_coding_mode_flag
# mb_skip_run = bits.read_ue()
# prevMbSkipped = mb_skip_run > 0
# for i in [0...mb_skip_run]
# currMbAddr = nextMbAddress(currMbAddr)
# if mb_skip_run > 0
# moreDataFlag = api.more_rbsp_data bits
# else
# sliceQPy = 26 + pps.pic_init_qp_minus26 + opts.sliceHeader.slice_qp_delta
# mb_skip_flag = api.read_ae bits
# sliceQPy: sliceQPy
read_ref_pic_list_mvc_modification: (opts) ->
throw new Error "Not implemented"
read_ref_pic_list_modification: (bits, opts) ->
sliceHeader = opts.sliceHeader
if sliceHeader.slice_type % 5 not in [2, 4]
ref_pic_list_modification_flag_l0 = bits.read_bit()
if ref_pic_list_modification_flag_l0
if sliceHeader.num_ref_idx_active_override_flag
l0 = sliceHeader.num_ref_idx_l0_active_minus1 + 1
else
l0 = pps.num_ref_idx_l0_default_active_minus1 + 1
loop
modification_of_pic_nums_idc = bits.read_ue()
if modification_of_pic_nums_idc in [0, 1]
abs_diff_pic_num_minus1 = bits.read_ue()
else if modification_of_pic_nums_idc is 2
long_term_pic_num = bits.read_ue()
if modification_of_pic_nums_idc is 3
break
if sliceHeader.slice_type % 5 is 1
ref_pic_list_modification_flag_l1 = bits.read_bit()
if ref_pic_list_modification_flag_l1
loop
modification_of_pic_nums_idc = bits.read_ue()
if modification_of_pic_nums_idc in [0, 1]
abs_diff_pic_num_minus1 = bits.read_ue()
else if modification_of_pic_nums_idc is 2
long_term_pic_num = bits.read_ue()
if modification_of_pic_nums_idc is 3
break
return
read_pred_weight_table: (bits, opts) ->
sliceHeader = opts.sliceHeader
luma_log2_weight_denom = bits.read_ue()
if not sps.chromaArrayType?
throw new Error "ChromaArrayType isn't set"
if sps.chromaArrayType isnt 0
chroma_log2_weight_denom = bits.read_ue()
luma_weight_10 = []
luma_offset_10 = []
chroma_weight_10 = []
chroma_offset_10 = []
for i in [0..sliceHeader.num_ref_idx_l0_active_minus1]
luma_weight_10_flag = bits.read_bit()
if luma_weight_10_flag
luma_weight_10[i] = bits.read_se()
luma_offset_10[i] = bits.read_se()
if sps.chromaArrayType isnt 0
chroma_weight_10_flag = bits.read_bit()
if chroma_weight_10_flag
chroma_weight_10[i] = []
chroma_offset_10[i] = []
for j in [0...2]
chroma_weight_10[i][j] = bits.read_se()
chroma_offset_10[i][j] = bits.read_se()
if sliceHeader.slice_type % 5 is 1
luma_weight_11 = []
luma_offset_11 = []
chroma_weight_11 = []
chroma_offset_11 = []
for i in [0..sliceHeader.num_ref_idx_l1_active_minus1]
luma_weight_11_flag = bits.read_bit()
if luma_weight_11_flag
luma_weight_11[i] = bits.read_se()
luma_offset_11[i] = bits.read_se()
if sps.chromaArrayType isnt 0
chroma_weight_11_flag = bits.read_bit()
if chroma_weight_11_flag
chroma_weight_11[i] = []
chroma_offset_11[i] = []
for j in [0...2]
chroma_weight_11[i][j] = bits.read_se()
chroma_offset_11[i][j] = bits.read_se()
read_dec_ref_pic_marking: (bits, opts) ->
sliceHeader = opts.sliceHeader
if sliceHeader.idrPicFlag
no_output_of_prior_pics_flag = bits.read_bit()
long_term_reference_flag = bits.read_bit()
else
adaptive_ref_pic_marking_mode_flag = bits.read_bit()
if adaptive_ref_pic_marking_mode_flag
loop
memory_management_control_operation = bits.read_ue()
if memory_management_control_operation in [1, 3]
difference_of_pic_nums_minus1 = bits.read_ue()
if memory_management_control_operation is 2
long_term_pic_num = bits.read_ue()
if memory_management_control_operation in [3, 6]
long_term_frame_idx = bits.read_ue()
if memory_management_control_operation is 4
max_long_term_frame_idx_plus1 = bits.read_ue()
if memory_management_control_operation is 0
break
read_slice_header: (bits, opts) ->
sliceHeader = opts.sliceHeader = {}
if opts.nalHeader.nal_unit_type is api.NAL_UNIT_TYPE_IDR_PICTURE
sliceHeader.idrPicFlag = 1
else
sliceHeader.idrPicFlag = 0
sliceHeader.first_mb_in_slice = bits.read_ue()
sliceHeader.slice_type = bits.read_ue()
sliceHeader.pic_parameter_set_id = bits.read_ue()
if sps.separate_colour_plane_flag is 1
colour_plane_id = bits.read_bits 2
sliceHeader.frame_num = bits.read_bits(sps.log2_max_frame_num_minus4 + 4)
if not sps.frame_mbs_only_flag
sliceHeader.field_pic_flag = bits.read_bit()
if sliceHeader.field_pic_flag
sliceHeader.bottom_field_flag = bits.read_bit()
if sps.mb_adaptive_frame_field_flag and not sliceHeader.field_pic_flag
sliceHeader.mbaffFrameFlag = 1
else
sliceHeader.mbaffFrameFlag = 0
if sliceHeader.idrPicFlag
sliceHeader.idr_pic_id = bits.read_ue()
if sps.pic_order_cnt_type is 0
sliceHeader.pic_order_cnt_lsb = bits.read_bits(sps.log2_max_pic_order_cnt_lsb_minus4 + 4)
if pps.bottom_field_pic_order_in_frame_present_flag and not sliceHeader.field_pic_flag
sliceHeader.delta_pic_order_cnt_bottom = bits.read_se()
if (sps.pic_order_cnt_type is 1) and (not delta_pic_order_always_zero_flag)
sliceHeader.delta_pic_order_cnt_0 = bits.read_se()
if pps.bottom_field_pic_order_in_frame_present_flag and not sliceHeader.field_pic_flag
sliceHeader.delta_pic_order_cnt_1 = bits.read_se()
if pps.redundant_pic_cnt_present_flag
redundant_pic_cnt = bits.read_ue()
sliceTypeString = api.getSliceTypeString sliceHeader.slice_type
if sliceTypeString is 'B'
direct_spatial_mv_pred_flag = bits.read_bit()
if sliceTypeString in ['P', 'SP', 'B']
sliceHeader.num_ref_idx_active_override_flag = bits.read_bit()
if sliceHeader.num_ref_idx_active_override_flag
sliceHeader.num_ref_idx_l0_active_minus1 = bits.read_ue()
if sliceTypeString is 'B'
sliceHeader.num_ref_idx_l1_active_minus1 = bits.read_ue()
if opts.nalHeader.nal_unit_type is 20
api.read_ref_pic_list_mvc_modification opts
else
api.read_ref_pic_list_modification bits, opts
if (pps.weighted_pred_flag and sliceTypeString in ['P', 'SP']) or
(pps.weighted_bipred_idc is 1 and sliceTypeString is 'B')
api.read_pred_weight_table bits, opts
if opts.nalHeader.nal_ref_idc isnt 0
api.read_dec_ref_pic_marking bits, opts
if pps.entropy_coding_mode_flag and (sliceTypeString not in ['I', 'SI'])
cabac_init_idc = bits.read_ue()
sliceHeader.slice_qp_delta = bits.read_se()
if sliceTypeString in ['SP', 'SI']
if sliceTypeString is 'SP'
sliceHeader.sp_for_switch_flag = bits.read_bit()
slice_qs_delta = bits.read_se()
if pps.deblocking_filter_control_present_flag
disable_deblocking_filter_idc = bits.read_ue()
if disable_deblocking_filter_idc isnt 1
slice_alpha_c0_offset_div2 = bits.read_se()
slice_beta_offset_div2 = bits.read_se()
if (pps.num_slice_groups_minus1 > 0) and (3 <= slice_group_map_type <= 5)
# Ceil( Log2( PicSizeInMapUnits + SliceGroupChangeRate + 1 ) )
numBits = Math.ceil(Math.log(sps.picSizeInMapUnits +
pps.slice_group_change_rate_minus1 + 1) / Math.LN2)
sliceHeader.slice_group_change_cycle = bits.read_bits(numBits)
_isSamePicture: (nalData1, nalData2) ->
for elem in [
'pic_parameter_set_id'
'frame_num'
'field_pic_flag'
'bottom_field_flag'
'idr_pic_id'
'pic_order_cnt_lsb'
'delta_pic_order_cnt_bottom'
'delta_pic_order_cnt_0'
'delta_pic_order_cnt_1'
'sp_for_switch_flag'
'slice_group_change_cycle'
]
if nalData1.sliceHeader[elem] isnt nalData2.sliceHeader[elem]
# different picture
return false
# same picture
return true
# Returns whether nalUnit1 and nalUnit2 share the same coded picture
#
# @return boolean true if the NAL units have the same picture.
isSamePicture: (nalUnit1, nalUnit2) ->
nalData1 = api.parseNALUnit nalUnit1
nalData2 = api.parseNALUnit nalUnit2
api._isSamePicture nalData1, nalData2
parseNALUnit: (nalUnit) ->
data = {}
nalUnit = api.removeEmulationPreventionByte nalUnit
bits = new Bits nalUnit
data.nalHeader = api.read_nal_header bits
if data.nalHeader.nal_unit_type in [
api.NAL_UNIT_TYPE_NON_IDR_PICTURE
api.NAL_UNIT_TYPE_IDR_PICTURE
]
api.read_slice_header bits, data
return data
# Removes all emulation prevention bytes (0x03 in 0x000003) from nalUnit and
# returns a new Buffer. If no emulation prevention bytes found in nalUnit,
# the returned value is the same Buffer instance as the given nalUnit.
removeEmulationPreventionByte: (nalUnit) ->
searchPos = 0
removeBytePositions = []
loop
emulPos = Bits.searchBytesInArray nalUnit, [0x00, 0x00, 0x03], searchPos
if emulPos is -1
break
removeBytePositions.push emulPos + 2
searchPos = emulPos + 3
if removeBytePositions.length > 0
newBuf = new Buffer nalUnit.length - removeBytePositions.length
currentSrcPos = 0
for pos, i in removeBytePositions
# srcBuf.copy(destBuf, destStart, srcStart, srcEnd)
nalUnit.copy newBuf, currentSrcPos - i, currentSrcPos, pos
currentSrcPos = pos + 1
if currentSrcPos < nalUnit.length
nalUnit.copy newBuf, currentSrcPos - removeBytePositions.length,
currentSrcPos, nalUnit.length
nalUnit = newBuf
return nalUnit
# opts:
# retrieveOnly (boolean): if true, videoBuf remains intact
getNextNALUnit: ->
if not api.hasMoreData()
return null
# Search for H.264 start code prefix.
#
# H.264 NAL unit is preceded by a byte-aligned
# "start code prefix" (0x000001). H.264 has "emulation
# prevention byte" (0x03) which is used to prevent a
# occurrence of 0x000001 in a NAL unit. Therefore a
# byte-aligned 0x000001 is always a start code prefix.
startCodePos = Bits.searchBytesInArray videoBuf, [0x00, 0x00, 0x01], 0
if startCodePos is -1 # last NAL unit
nalUnit = videoBuf
videoBuf = []
return nalUnit
nalUnit = videoBuf[0...startCodePos]
# Truncate video buffer
videoBuf = videoBuf[startCodePos+3..]
# Remove trailing_zero_8bits
while nalUnit[nalUnit.length-1] is 0x00
nalUnit = nalUnit[0...nalUnit.length-1]
if nalUnit.length > 0
nalUnitType = nalUnit[0] & 0x1f
if nalUnitType is api.NAL_UNIT_TYPE_SPS
api.readSPS nalUnit
else if nalUnitType is api.NAL_UNIT_TYPE_PPS
api.readPPS nalUnit
else if nalUnitType is api.NAL_UNIT_TYPE_SEI
api.readSEI nalUnit
return nalUnit
else
return api.getNextNALUnit()
clip3: (x, y, z) ->
if z < x
return x
if z > y
return y
return z
# 9.3.3.2.3
decodeBypass: (bits, vars) ->
vars.codIOffset <<= 1
vars.codIOffset |= bits.read_bit()
if vars.codIOffset >= vars.codIRange
vars.binVal = 1
vars.codIOffset -= vars.codIRange
else
vars.binVal = 0
deriveCtxIdx: (input) ->
# input
binIdx = input.binIdx
maxBinIdxCtx = input.maxBinIdxCtx
ctxIdxOffset = input.ctxIdxOffset
# TODO
ctxIdxInc = null
return {
ctxIdx: 0
}
# 9.3.3.2.2
renormD: (bits, vars) ->
while vars.codIRange < 256
vars.codIRange <<= 1
vars.codIOffset <<= 1 # TODO: correct?
vars.codIOffset |= bits.read_bit()
# 9.3.3.2.4
decodeTerminate: (bits, vars) ->
vars.codIRange -= 2
if vars.codIOffset >= vars.codIRange
vars.binVal = 1
else
vars.binVal = 0
api.renormD bits
# 9.3.3.2.1
decodeDecision: (vars) ->
qCodIRangeIdx = (vars.codIRange >> 6) & 3
codIRangeLPS = rangeTabLPS[vars.pStateIdx][qCodIRangeIdx]
vars.codIRange -= codIRangeLPS
if vars.codIOffset >= vars.codIRange
vars.binVal = 1 - vars.valMPS
vars.codIOffset -= vars.codIRange
vars.codIRange = codIRangeLPS
else
vars.binVal = vars.valMPS
# 9.3.3.2.1.1
if vars.binVal is vars.valMPS
vars.pStateIdx = transIdxMPS(vars.pStateIdx)
else
if vars.pStateIdx is 0
vars.valMPS = 1 - vars.valMPS
vars.pStateIdx = transIdxLPS(vars.pStateIdx)
api.renormD vars
read_ae: (bits, opts) ->
# TODO
throw new Error "Not implemented"
# bypassFlag = opts.bypassFlag
# ctxIdx = opts.ctxIdx
#
# # 9.3.1.1 initialization
# preCtxState = api.clip3(1, 126,
# ((m * api.clip3(0, 51, opts.sliceQPy)) >> 4) + n)
# if preCtxState <= 63
# pStateIdx = 63 - preCtxState
# valMPS = 0
# else
# pStateIdx = preCtxState - 64
# valMPS = 1
#
# # 9.3.1.2
# vars =
# codIRange: 510
# codIOffset: bits.read_bits 9
# pStateIdx: pStateIdx
# valMPS: valMPS
# if vars.codIOffset in [510, 511]
# throw new Error "Illegal codIOffset: #{vars.codIOffset}"
#
# if bypassFlag is 1
# decodeBypass vars
# else if bypassFlag is 0 and ctxIdx is 276
# decodeTerminate bits
# else
# decodeDecision()
read_nal_unit_header_svc_extension: ->
# TODO
throw new Error "Not implemented"
read_nal_unit_header_mvc_extension: ->
# TODO
throw new Error "Not implemented"
read_nal_header: (bits) ->
nalHeader = {}
forbidden_zero_bit = bits.read_bit()
nalHeader.nal_ref_idc = bits.read_bits 2
nalHeader.nal_unit_type = bits.read_bits 5
if nalHeader.nal_unit_type in [14, 20]
svc_extension_flag = bits.read_bit()
if svc_extension_flag
api.read_nal_unit_header_svc_extension()
else
api.read_nal_unit_header_mvc_extension()
return nalHeader
read_hrd_parameters: (bits) ->
cpb_cnt_minus1 = bits.read_ue()
bit_rate_scale = bits.read_bits 4
cpb_size_scale = bits.read_bits 4
bit_rate_value_minus1 = []
cpb_size_value_minus1 = []
cbr_flag = []
for schedSelIdx in [0..cpb_cnt_minus1]
bit_rate_value_minus1[schedSelIdx] = bits.read_ue()
cpb_size_value_minus1[schedSelIdx] = bits.read_ue()
cbr_flag[schedSelIdx] = bits.read_bit()
initial_cpb_removal_delay_length_minus1 = bits.read_bits 5
cpb_removal_delay_length_minus1 = bits.read_bits 5
dpb_output_delay_length_minus1 = bits.read_bits 5
time_offset_length = bits.read_bits 5
read_vui_parameters: (bits) ->
vui = {}
vui.aspect_ratio_info_present_flag = bits.read_bit()
if vui.aspect_ratio_info_present_flag
vui.aspect_ratio_idc = bits.read_bits 8
if vui.aspect_ratio_idc is ASPECT_RATIO_IDC_EXTENDED_SAR
vui.sar_width = bits.read_bits 16
vui.sar_height = bits.read_bits 16
vui.overscan_info_present_flag = bits.read_bit()
if vui.overscan_info_present_flag
vui.overscan_appropriate_flag = bits.read_bit()
vui.video_signal_type_present_flag = bits.read_bit()
if vui.video_signal_type_present_flag
vui.video_format = bits.read_bits 3
vui.video_full_range_flag = bits.read_bit()
vui.colour_description_present_flag = bits.read_bit()
if vui.colour_description_present_flag
vui.colour_primaries = bits.read_bits 8
vui.transfer_characteristics = bits.read_bits 8
vui.matrix_coefficients = bits.read_bits 8
vui.chroma_loc_info_present_flag = bits.read_bit()
if vui.chroma_loc_info_present_flag is 1
vui.chroma_sample_loc_type_top_field = bits.read_ue()
vui.chroma_sample_loc_type_bottom_field = bits.read_ue()
vui.timing_info_present_flag = bits.read_bit()
if vui.timing_info_present_flag
vui.num_units_in_tick = bits.read_bits 32
vui.time_scale = bits.read_bits 32
vui.fixed_frame_rate_flag = bits.read_bit()
vui.nal_hrd_parameters_present_flag = bits.read_bit()
if vui.nal_hrd_parameters_present_flag
api.read_hrd_parameters bits
vui.vcl_hrd_parameters_present_flag = bits.read_bit()
if vui.vcl_hrd_parameters_present_flag
api.read_hrd_parameters bits
if vui.nal_hrd_parameters_present_flag or vui.vcl_hrd_parameters_present_flag
vui.low_delay_hrd_flag = bits.read_bit()
vui.pic_struct_present_flag = bits.read_bit()
vui.bitstream_restriction_flag = bits.read_bit()
if vui.bitstream_restriction_flag
vui.motion_vectors_over_pic_boundaries_flag = bits.read_bit()
vui.max_bytes_per_pic_denom = bits.read_ue()
vui.max_bits_per_mb_denom = bits.read_ue()
vui.log2_max_mv_length_horizontal = bits.read_ue()
vui.log2_max_mv_length_vertical = bits.read_ue()
vui.max_num_reorder_frames = bits.read_ue()
vui.max_dec_frame_buffering = bits.read_ue()
# returns an object {