mirrored from https://chromium.googlesource.com/webm/libvpx
-
Notifications
You must be signed in to change notification settings - Fork 336
/
vpx_encoder.h
968 lines (876 loc) · 36.9 KB
/
vpx_encoder.h
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
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef VPX_VPX_VPX_ENCODER_H_
#define VPX_VPX_VPX_ENCODER_H_
/*!\defgroup encoder Encoder Algorithm Interface
* \ingroup codec
* This abstraction allows applications using this encoder to easily support
* multiple video formats with minimal code duplication. This section describes
* the interface common to all encoders.
* @{
*/
/*!\file
* \brief Describes the encoder algorithm interface to applications.
*
* This file describes the interface between an application and a
* video encoder algorithm.
*
*/
#ifdef __cplusplus
extern "C" {
#endif
#include "./vpx_codec.h"
/*! Temporal Scalability: Maximum length of the sequence defining frame
* layer membership
*/
#define VPX_TS_MAX_PERIODICITY 16
/*! Temporal Scalability: Maximum number of coding layers */
#define VPX_TS_MAX_LAYERS 5
/*! Temporal+Spatial Scalability: Maximum number of coding layers */
#define VPX_MAX_LAYERS 12 // 3 temporal + 4 spatial layers are allowed.
/*! Spatial Scalability: Maximum number of coding layers */
#define VPX_SS_MAX_LAYERS 5
/*! Spatial Scalability: Default number of coding layers */
#define VPX_SS_DEFAULT_LAYERS 1
/*!\brief Current ABI version number
*
* \internal
* If this file is altered in any way that changes the ABI, this value
* must be bumped. Examples include, but are not limited to, changing
* types, removing or reassigning enums, adding/removing/rearranging
* fields to structures
*/
#define VPX_ENCODER_ABI_VERSION \
(14 + VPX_CODEC_ABI_VERSION) /**<\hideinitializer*/
/*! \brief Encoder capabilities bitfield
*
* Each encoder advertises the capabilities it supports as part of its
* ::vpx_codec_iface_t interface structure. Capabilities are extra
* interfaces or functionality, and are not required to be supported
* by an encoder.
*
* The available flags are specified by VPX_CODEC_CAP_* defines.
*/
#define VPX_CODEC_CAP_PSNR 0x10000 /**< Can issue PSNR packets */
/*! Can output one partition at a time. Each partition is returned in its
* own VPX_CODEC_CX_FRAME_PKT, with the FRAME_IS_FRAGMENT flag set for
* every partition but the last. In this mode all frames are always
* returned partition by partition.
*/
#define VPX_CODEC_CAP_OUTPUT_PARTITION 0x20000
/*! \brief Initialization-time Feature Enabling
*
* Certain codec features must be known at initialization time, to allow
* for proper memory allocation.
*
* The available flags are specified by VPX_CODEC_USE_* defines.
*/
#define VPX_CODEC_USE_PSNR 0x10000 /**< Calculate PSNR on each frame */
/*!\brief Make the encoder output one partition at a time. */
#define VPX_CODEC_USE_OUTPUT_PARTITION 0x20000
#define VPX_CODEC_USE_HIGHBITDEPTH 0x40000 /**< Use high bitdepth */
/*!\brief Generic fixed size buffer structure
*
* This structure is able to hold a reference to any fixed size buffer.
*/
typedef struct vpx_fixed_buf {
void *buf; /**< Pointer to the data */
size_t sz; /**< Length of the buffer, in chars */
} vpx_fixed_buf_t; /**< alias for struct vpx_fixed_buf */
/*!\brief Time Stamp Type
*
* An integer, which when multiplied by the stream's time base, provides
* the absolute time of a sample.
*/
typedef int64_t vpx_codec_pts_t;
/*!\brief Compressed Frame Flags
*
* This type represents a bitfield containing information about a compressed
* frame that may be useful to an application. The most significant 16 bits
* can be used by an algorithm to provide additional detail, for example to
* support frame types that are codec specific (MPEG-1 D-frames for example)
*/
typedef uint32_t vpx_codec_frame_flags_t;
#define VPX_FRAME_IS_KEY 0x1 /**< frame is the start of a GOP */
/*!\brief frame can be dropped without affecting the stream (no future frame
* depends on this one) */
#define VPX_FRAME_IS_DROPPABLE 0x2
/*!\brief frame should be decoded but will not be shown */
#define VPX_FRAME_IS_INVISIBLE 0x4
/*!\brief this is a fragment of the encoded frame */
#define VPX_FRAME_IS_FRAGMENT 0x8
/*!\brief Error Resilient flags
*
* These flags define which error resilient features to enable in the
* encoder. The flags are specified through the
* vpx_codec_enc_cfg::g_error_resilient variable.
*/
typedef uint32_t vpx_codec_er_flags_t;
/*!\brief Improve resiliency against losses of whole frames */
#define VPX_ERROR_RESILIENT_DEFAULT 0x1
/*!\brief The frame partitions are independently decodable by the bool decoder,
* meaning that partitions can be decoded even though earlier partitions have
* been lost. Note that intra prediction is still done over the partition
* boundary. */
#define VPX_ERROR_RESILIENT_PARTITIONS 0x2
/*!\brief Encoder output packet variants
*
* This enumeration lists the different kinds of data packets that can be
* returned by calls to vpx_codec_get_cx_data(). Algorithms \ref MAY
* extend this list to provide additional functionality.
*/
enum vpx_codec_cx_pkt_kind {
VPX_CODEC_CX_FRAME_PKT, /**< Compressed video frame */
VPX_CODEC_STATS_PKT, /**< Two-pass statistics for this frame */
VPX_CODEC_FPMB_STATS_PKT, /**< first pass mb statistics for this frame */
VPX_CODEC_PSNR_PKT, /**< PSNR statistics for this frame */
VPX_CODEC_CUSTOM_PKT = 256 /**< Algorithm extensions */
};
/*!\brief Encoder output packet
*
* This structure contains the different kinds of output data the encoder
* may produce while compressing a frame.
*/
typedef struct vpx_codec_cx_pkt {
enum vpx_codec_cx_pkt_kind kind; /**< packet variant */
union {
struct {
void *buf; /**< compressed data buffer */
size_t sz; /**< length of compressed data */
/*!\brief time stamp to show frame (in timebase units) */
vpx_codec_pts_t pts;
/*!\brief duration to show frame (in timebase units) */
unsigned long duration;
vpx_codec_frame_flags_t flags; /**< flags for this frame */
/*!\brief the partition id defines the decoding order of the partitions.
* Only applicable when "output partition" mode is enabled. First
* partition has id 0.*/
int partition_id;
/*!\brief Width and height of frames in this packet. VP8 will only use the
* first one.*/
unsigned int width[VPX_SS_MAX_LAYERS]; /**< frame width */
unsigned int height[VPX_SS_MAX_LAYERS]; /**< frame height */
/*!\brief Flag to indicate if spatial layer frame in this packet is
* encoded or dropped. VP8 will always be set to 1.*/
uint8_t spatial_layer_encoded[VPX_SS_MAX_LAYERS];
} frame; /**< data for compressed frame packet */
vpx_fixed_buf_t twopass_stats; /**< data for two-pass packet */
vpx_fixed_buf_t firstpass_mb_stats; /**< first pass mb packet */
struct vpx_psnr_pkt {
unsigned int samples[4]; /**< Number of samples, total/y/u/v */
uint64_t sse[4]; /**< sum squared error, total/y/u/v */
double psnr[4]; /**< PSNR, total/y/u/v */
} psnr; /**< data for PSNR packet */
vpx_fixed_buf_t raw; /**< data for arbitrary packets */
/* This packet size is fixed to allow codecs to extend this
* interface without having to manage storage for raw packets,
* i.e., if it's smaller than 128 bytes, you can store in the
* packet list directly.
*/
char pad[128 - sizeof(enum vpx_codec_cx_pkt_kind)]; /**< fixed sz */
} data; /**< packet data */
} vpx_codec_cx_pkt_t; /**< alias for struct vpx_codec_cx_pkt */
/*!\brief Encoder return output buffer callback
*
* This callback function, when registered, returns with packets when each
* spatial layer is encoded.
*/
typedef void (*vpx_codec_enc_output_cx_pkt_cb_fn_t)(vpx_codec_cx_pkt_t *pkt,
void *user_data);
/*!\brief Callback function pointer / user data pair storage */
typedef struct vpx_codec_enc_output_cx_cb_pair {
vpx_codec_enc_output_cx_pkt_cb_fn_t output_cx_pkt; /**< Callback function */
void *user_priv; /**< Pointer to private data */
} vpx_codec_priv_output_cx_pkt_cb_pair_t;
/*!\brief Rational Number
*
* This structure holds a fractional value.
*/
typedef struct vpx_rational {
int num; /**< fraction numerator */
int den; /**< fraction denominator */
} vpx_rational_t; /**< alias for struct vpx_rational */
/*!\brief Multi-pass Encoding Pass */
typedef enum vpx_enc_pass {
VPX_RC_ONE_PASS, /**< Single pass mode */
VPX_RC_FIRST_PASS, /**< First pass of multi-pass mode */
VPX_RC_LAST_PASS /**< Final pass of multi-pass mode */
} vpx_enc_pass;
/*!\brief Rate control mode */
enum vpx_rc_mode {
VPX_VBR, /**< Variable Bit Rate (VBR) mode */
VPX_CBR, /**< Constant Bit Rate (CBR) mode */
VPX_CQ, /**< Constrained Quality (CQ) mode */
VPX_Q, /**< Constant Quality (Q) mode */
};
/*!\brief Keyframe placement mode.
*
* This enumeration determines whether keyframes are placed automatically by
* the encoder or whether this behavior is disabled. Older releases of this
* SDK were implemented such that VPX_KF_FIXED meant keyframes were disabled.
* This name is confusing for this behavior, so the new symbols to be used
* are VPX_KF_AUTO and VPX_KF_DISABLED.
*/
enum vpx_kf_mode {
VPX_KF_FIXED, /**< deprecated, implies VPX_KF_DISABLED */
VPX_KF_AUTO, /**< Encoder determines optimal placement automatically */
VPX_KF_DISABLED = 0 /**< Encoder does not place keyframes. */
};
/*!\brief Encoded Frame Flags
*
* This type indicates a bitfield to be passed to vpx_codec_encode(), defining
* per-frame boolean values. By convention, bits common to all codecs will be
* named VPX_EFLAG_*, and bits specific to an algorithm will be named
* /algo/_eflag_*. The lower order 16 bits are reserved for common use.
*/
typedef long vpx_enc_frame_flags_t;
#define VPX_EFLAG_FORCE_KF (1 << 0) /**< Force this frame to be a keyframe */
/*!\brief Encoder configuration structure
*
* This structure contains the encoder settings that have common representations
* across all codecs. This doesn't imply that all codecs support all features,
* however.
*/
typedef struct vpx_codec_enc_cfg {
/*
* generic settings (g)
*/
/*!\brief Deprecated: Algorithm specific "usage" value
*
* This value must be zero.
*/
unsigned int g_usage;
/*!\brief Maximum number of threads to use
*
* For multi-threaded implementations, use no more than this number of
* threads. The codec may use fewer threads than allowed. The value
* 0 is equivalent to the value 1.
*/
unsigned int g_threads;
/*!\brief Bitstream profile to use
*
* Some codecs support a notion of multiple bitstream profiles. Typically
* this maps to a set of features that are turned on or off. Often the
* profile to use is determined by the features of the intended decoder.
* Consult the documentation for the codec to determine the valid values
* for this parameter, or set to zero for a sane default.
*/
unsigned int g_profile; /**< profile of bitstream to use */
/*!\brief Width of the frame
*
* This value identifies the presentation resolution of the frame,
* in pixels. Note that the frames passed as input to the encoder must
* have this resolution. Frames will be presented by the decoder in this
* resolution, independent of any spatial resampling the encoder may do.
*/
unsigned int g_w;
/*!\brief Height of the frame
*
* This value identifies the presentation resolution of the frame,
* in pixels. Note that the frames passed as input to the encoder must
* have this resolution. Frames will be presented by the decoder in this
* resolution, independent of any spatial resampling the encoder may do.
*/
unsigned int g_h;
/*!\brief Bit-depth of the codec
*
* This value identifies the bit_depth of the codec,
* Only certain bit-depths are supported as identified in the
* vpx_bit_depth_t enum.
*/
vpx_bit_depth_t g_bit_depth;
/*!\brief Bit-depth of the input frames
*
* This value identifies the bit_depth of the input frames in bits.
* Note that the frames passed as input to the encoder must have
* this bit-depth.
*/
unsigned int g_input_bit_depth;
/*!\brief Stream timebase units
*
* Indicates the smallest interval of time, in seconds, used by the stream.
* For fixed frame rate material, or variable frame rate material where
* frames are timed at a multiple of a given clock (ex: video capture),
* the \ref RECOMMENDED method is to set the timebase to the reciprocal
* of the frame rate (ex: 1001/30000 for 29.970 Hz NTSC). This allows the
* pts to correspond to the frame number, which can be handy. For
* re-encoding video from containers with absolute time timestamps, the
* \ref RECOMMENDED method is to set the timebase to that of the parent
* container or multimedia framework (ex: 1/1000 for ms, as in FLV).
*/
struct vpx_rational g_timebase;
/*!\brief Enable error resilient modes.
*
* The error resilient bitfield indicates to the encoder which features
* it should enable to take measures for streaming over lossy or noisy
* links.
*/
vpx_codec_er_flags_t g_error_resilient;
/*!\brief Multi-pass Encoding Mode
*
* This value should be set to the current phase for multi-pass encoding.
* For single pass, set to #VPX_RC_ONE_PASS.
*/
enum vpx_enc_pass g_pass;
/*!\brief Allow lagged encoding
*
* If set, this value allows the encoder to consume a number of input
* frames before producing output frames. This allows the encoder to
* base decisions for the current frame on future frames. This does
* increase the latency of the encoding pipeline, so it is not appropriate
* in all situations (ex: realtime encoding).
*
* Note that this is a maximum value -- the encoder may produce frames
* sooner than the given limit. Set this value to 0 to disable this
* feature.
*/
unsigned int g_lag_in_frames;
/*
* rate control settings (rc)
*/
/*!\brief Temporal resampling configuration, if supported by the codec.
*
* Temporal resampling allows the codec to "drop" frames as a strategy to
* meet its target data rate. This can cause temporal discontinuities in
* the encoded video, which may appear as stuttering during playback. This
* trade-off is often acceptable, but for many applications is not. It can
* be disabled in these cases.
*
* This threshold is described as a percentage of the target data buffer.
* When the data buffer falls below this percentage of fullness, a
* dropped frame is indicated. Set the threshold to zero (0) to disable
* this feature.
*/
unsigned int rc_dropframe_thresh;
/*!\brief Enable/disable spatial resampling, if supported by the codec.
*
* Spatial resampling allows the codec to compress a lower resolution
* version of the frame, which is then upscaled by the encoder to the
* correct presentation resolution. This increases visual quality at
* low data rates, at the expense of CPU time on the encoder/decoder.
*/
unsigned int rc_resize_allowed;
/*!\brief Internal coded frame width.
*
* If spatial resampling is enabled this specifies the width of the
* encoded frame.
*/
unsigned int rc_scaled_width;
/*!\brief Internal coded frame height.
*
* If spatial resampling is enabled this specifies the height of the
* encoded frame.
*/
unsigned int rc_scaled_height;
/*!\brief Spatial resampling up watermark.
*
* This threshold is described as a percentage of the target data buffer.
* When the data buffer rises above this percentage of fullness, the
* encoder will step up to a higher resolution version of the frame.
*/
unsigned int rc_resize_up_thresh;
/*!\brief Spatial resampling down watermark.
*
* This threshold is described as a percentage of the target data buffer.
* When the data buffer falls below this percentage of fullness, the
* encoder will step down to a lower resolution version of the frame.
*/
unsigned int rc_resize_down_thresh;
/*!\brief Rate control algorithm to use.
*
* Indicates whether the end usage of this stream is to be streamed over
* a bandwidth constrained link, indicating that Constant Bit Rate (CBR)
* mode should be used, or whether it will be played back on a high
* bandwidth link, as from a local disk, where higher variations in
* bitrate are acceptable.
*/
enum vpx_rc_mode rc_end_usage;
/*!\brief Two-pass stats buffer.
*
* A buffer containing all of the stats packets produced in the first
* pass, concatenated.
*/
vpx_fixed_buf_t rc_twopass_stats_in;
/*!\brief first pass mb stats buffer.
*
* A buffer containing all of the first pass mb stats packets produced
* in the first pass, concatenated.
*/
vpx_fixed_buf_t rc_firstpass_mb_stats_in;
/*!\brief Target data rate
*
* Target bandwidth to use for this stream, in kilobits per second.
*/
unsigned int rc_target_bitrate;
/*
* quantizer settings
*/
/*!\brief Minimum (Best Quality) Quantizer
*
* The quantizer is the most direct control over the quality of the
* encoded image. The range of valid values for the quantizer is codec
* specific. Consult the documentation for the codec to determine the
* values to use.
*/
unsigned int rc_min_quantizer;
/*!\brief Maximum (Worst Quality) Quantizer
*
* The quantizer is the most direct control over the quality of the
* encoded image. The range of valid values for the quantizer is codec
* specific. Consult the documentation for the codec to determine the
* values to use.
*/
unsigned int rc_max_quantizer;
/*
* bitrate tolerance
*/
/*!\brief Rate control adaptation undershoot control
*
* VP8: Expressed as a percentage of the target bitrate,
* controls the maximum allowed adaptation speed of the codec.
* This factor controls the maximum amount of bits that can
* be subtracted from the target bitrate in order to compensate
* for prior overshoot.
* VP9: Expressed as a percentage of the target bitrate, a threshold
* undershoot level (current rate vs target) beyond which more aggressive
* corrective measures are taken.
* *
* Valid values in the range VP8:0-1000 VP9: 0-100.
*/
unsigned int rc_undershoot_pct;
/*!\brief Rate control adaptation overshoot control
*
* VP8: Expressed as a percentage of the target bitrate,
* controls the maximum allowed adaptation speed of the codec.
* This factor controls the maximum amount of bits that can
* be added to the target bitrate in order to compensate for
* prior undershoot.
* VP9: Expressed as a percentage of the target bitrate, a threshold
* overshoot level (current rate vs target) beyond which more aggressive
* corrective measures are taken.
*
* Valid values in the range VP8:0-1000 VP9: 0-100.
*/
unsigned int rc_overshoot_pct;
/*
* decoder buffer model parameters
*/
/*!\brief Decoder Buffer Size
*
* This value indicates the amount of data that may be buffered by the
* decoding application. Note that this value is expressed in units of
* time (milliseconds). For example, a value of 5000 indicates that the
* client will buffer (at least) 5000ms worth of encoded data. Use the
* target bitrate (#rc_target_bitrate) to convert to bits/bytes, if
* necessary.
*/
unsigned int rc_buf_sz;
/*!\brief Decoder Buffer Initial Size
*
* This value indicates the amount of data that will be buffered by the
* decoding application prior to beginning playback. This value is
* expressed in units of time (milliseconds). Use the target bitrate
* (#rc_target_bitrate) to convert to bits/bytes, if necessary.
*/
unsigned int rc_buf_initial_sz;
/*!\brief Decoder Buffer Optimal Size
*
* This value indicates the amount of data that the encoder should try
* to maintain in the decoder's buffer. This value is expressed in units
* of time (milliseconds). Use the target bitrate (#rc_target_bitrate)
* to convert to bits/bytes, if necessary.
*/
unsigned int rc_buf_optimal_sz;
/*
* 2 pass rate control parameters
*/
/*!\brief Two-pass mode CBR/VBR bias
*
* Bias, expressed on a scale of 0 to 100, for determining target size
* for the current frame. The value 0 indicates the optimal CBR mode
* value should be used. The value 100 indicates the optimal VBR mode
* value should be used. Values in between indicate which way the
* encoder should "lean."
*/
unsigned int rc_2pass_vbr_bias_pct;
/*!\brief Two-pass mode per-GOP minimum bitrate
*
* This value, expressed as a percentage of the target bitrate, indicates
* the minimum bitrate to be used for a single GOP (aka "section")
*/
unsigned int rc_2pass_vbr_minsection_pct;
/*!\brief Two-pass mode per-GOP maximum bitrate
*
* This value, expressed as a percentage of the target bitrate, indicates
* the maximum bitrate to be used for a single GOP (aka "section")
*/
unsigned int rc_2pass_vbr_maxsection_pct;
/*!\brief Two-pass corpus vbr mode complexity control
* Used only in VP9: A value representing the corpus midpoint complexity
* for corpus vbr mode. This value defaults to 0 which disables corpus vbr
* mode in favour of normal vbr mode.
*/
unsigned int rc_2pass_vbr_corpus_complexity;
/*
* keyframing settings (kf)
*/
/*!\brief Keyframe placement mode
*
* This value indicates whether the encoder should place keyframes at a
* fixed interval, or determine the optimal placement automatically
* (as governed by the #kf_min_dist and #kf_max_dist parameters)
*/
enum vpx_kf_mode kf_mode;
/*!\brief Keyframe minimum interval
*
* This value, expressed as a number of frames, prevents the encoder from
* placing a keyframe nearer than kf_min_dist to the previous keyframe. At
* least kf_min_dist frames non-keyframes will be coded before the next
* keyframe. Set kf_min_dist equal to kf_max_dist for a fixed interval.
*/
unsigned int kf_min_dist;
/*!\brief Keyframe maximum interval
*
* This value, expressed as a number of frames, forces the encoder to code
* a keyframe if one has not been coded in the last kf_max_dist frames.
* A value of 0 implies all frames will be keyframes. Set kf_min_dist
* equal to kf_max_dist for a fixed interval.
*/
unsigned int kf_max_dist;
/*
* Spatial scalability settings (ss)
*/
/*!\brief Number of spatial coding layers.
*
* This value specifies the number of spatial coding layers to be used.
*/
unsigned int ss_number_layers;
/*!\brief Enable auto alt reference flags for each spatial layer.
*
* These values specify if auto alt reference frame is enabled for each
* spatial layer.
*/
int ss_enable_auto_alt_ref[VPX_SS_MAX_LAYERS];
/*!\brief Target bitrate for each spatial layer.
*
* These values specify the target coding bitrate to be used for each
* spatial layer. (in kbps)
*/
unsigned int ss_target_bitrate[VPX_SS_MAX_LAYERS];
/*!\brief Number of temporal coding layers.
*
* This value specifies the number of temporal layers to be used.
*/
unsigned int ts_number_layers;
/*!\brief Target bitrate for each temporal layer.
*
* These values specify the target coding bitrate to be used for each
* temporal layer. (in kbps)
*/
unsigned int ts_target_bitrate[VPX_TS_MAX_LAYERS];
/*!\brief Frame rate decimation factor for each temporal layer.
*
* These values specify the frame rate decimation factors to apply
* to each temporal layer.
*/
unsigned int ts_rate_decimator[VPX_TS_MAX_LAYERS];
/*!\brief Length of the sequence defining frame temporal layer membership.
*
* This value specifies the length of the sequence that defines the
* membership of frames to temporal layers. For example, if the
* ts_periodicity = 8, then the frames are assigned to coding layers with a
* repeated sequence of length 8.
*/
unsigned int ts_periodicity;
/*!\brief Template defining the membership of frames to temporal layers.
*
* This array defines the membership of frames to temporal coding layers.
* For a 2-layer encoding that assigns even numbered frames to one temporal
* layer (0) and odd numbered frames to a second temporal layer (1) with
* ts_periodicity=8, then ts_layer_id = (0,1,0,1,0,1,0,1).
*/
unsigned int ts_layer_id[VPX_TS_MAX_PERIODICITY];
/*!\brief Target bitrate for each spatial/temporal layer.
*
* These values specify the target coding bitrate to be used for each
* spatial/temporal layer. (in kbps)
*
*/
unsigned int layer_target_bitrate[VPX_MAX_LAYERS];
/*!\brief Temporal layering mode indicating which temporal layering scheme to
* use.
*
* The value (refer to VP9E_TEMPORAL_LAYERING_MODE) specifies the
* temporal layering mode to use.
*
*/
int temporal_layering_mode;
} vpx_codec_enc_cfg_t; /**< alias for struct vpx_codec_enc_cfg */
/*!\brief vp9 svc extra configure parameters
*
* This defines max/min quantizers and scale factors for each layer
*
*/
typedef struct vpx_svc_parameters {
int max_quantizers[VPX_MAX_LAYERS]; /**< Max Q for each layer */
int min_quantizers[VPX_MAX_LAYERS]; /**< Min Q for each layer */
int scaling_factor_num[VPX_MAX_LAYERS]; /**< Scaling factor-numerator */
int scaling_factor_den[VPX_MAX_LAYERS]; /**< Scaling factor-denominator */
int speed_per_layer[VPX_MAX_LAYERS]; /**< Speed setting for each sl */
int temporal_layering_mode; /**< Temporal layering mode */
} vpx_svc_extra_cfg_t;
/*!\brief Initialize an encoder instance
*
* Initializes a encoder context using the given interface. Applications
* should call the vpx_codec_enc_init convenience macro instead of this
* function directly, to ensure that the ABI version number parameter
* is properly initialized.
*
* If the library was configured with --disable-multithread, this call
* is not thread safe and should be guarded with a lock if being used
* in a multithreaded context.
*
* \param[in] ctx Pointer to this instance's context.
* \param[in] iface Pointer to the algorithm interface to use.
* \param[in] cfg Configuration to use, if known. May be NULL.
* \param[in] flags Bitfield of VPX_CODEC_USE_* flags
* \param[in] ver ABI version number. Must be set to
* VPX_ENCODER_ABI_VERSION
* \retval #VPX_CODEC_OK
* The decoder algorithm initialized.
* \retval #VPX_CODEC_MEM_ERROR
* Memory allocation failed.
*/
vpx_codec_err_t vpx_codec_enc_init_ver(vpx_codec_ctx_t *ctx,
vpx_codec_iface_t *iface,
const vpx_codec_enc_cfg_t *cfg,
vpx_codec_flags_t flags, int ver);
/*!\brief Convenience macro for vpx_codec_enc_init_ver()
*
* Ensures the ABI version parameter is properly set.
*/
#define vpx_codec_enc_init(ctx, iface, cfg, flags) \
vpx_codec_enc_init_ver(ctx, iface, cfg, flags, VPX_ENCODER_ABI_VERSION)
/*!\brief Initialize multi-encoder instance
*
* Initializes multi-encoder context using the given interface.
* Applications should call the vpx_codec_enc_init_multi convenience macro
* instead of this function directly, to ensure that the ABI version number
* parameter is properly initialized.
*
* \param[in] ctx Pointer to this instance's context.
* \param[in] iface Pointer to the algorithm interface to use.
* \param[in] cfg Configuration to use, if known. May be NULL.
* \param[in] num_enc Total number of encoders.
* \param[in] flags Bitfield of VPX_CODEC_USE_* flags
* \param[in] dsf Pointer to down-sampling factors.
* \param[in] ver ABI version number. Must be set to
* VPX_ENCODER_ABI_VERSION
* \retval #VPX_CODEC_OK
* The decoder algorithm initialized.
* \retval #VPX_CODEC_MEM_ERROR
* Memory allocation failed.
*/
vpx_codec_err_t vpx_codec_enc_init_multi_ver(
vpx_codec_ctx_t *ctx, vpx_codec_iface_t *iface, vpx_codec_enc_cfg_t *cfg,
int num_enc, vpx_codec_flags_t flags, vpx_rational_t *dsf, int ver);
/*!\brief Convenience macro for vpx_codec_enc_init_multi_ver()
*
* Ensures the ABI version parameter is properly set.
*/
#define vpx_codec_enc_init_multi(ctx, iface, cfg, num_enc, flags, dsf) \
vpx_codec_enc_init_multi_ver(ctx, iface, cfg, num_enc, flags, dsf, \
VPX_ENCODER_ABI_VERSION)
/*!\brief Get a default configuration
*
* Initializes a encoder configuration structure with default values. Supports
* the notion of "usages" so that an algorithm may offer different default
* settings depending on the user's intended goal. This function \ref SHOULD
* be called by all applications to initialize the configuration structure
* before specializing the configuration with application specific values.
*
* \param[in] iface Pointer to the algorithm interface to use.
* \param[out] cfg Configuration buffer to populate.
* \param[in] usage Must be set to 0.
*
* \retval #VPX_CODEC_OK
* The configuration was populated.
* \retval #VPX_CODEC_INCAPABLE
* Interface is not an encoder interface.
* \retval #VPX_CODEC_INVALID_PARAM
* A parameter was NULL, or the usage value was not recognized.
*/
vpx_codec_err_t vpx_codec_enc_config_default(vpx_codec_iface_t *iface,
vpx_codec_enc_cfg_t *cfg,
unsigned int usage);
/*!\brief Set or change configuration
*
* Reconfigures an encoder instance according to the given configuration.
*
* \param[in] ctx Pointer to this instance's context
* \param[in] cfg Configuration buffer to use
*
* \retval #VPX_CODEC_OK
* The configuration was populated.
* \retval #VPX_CODEC_INCAPABLE
* Interface is not an encoder interface.
* \retval #VPX_CODEC_INVALID_PARAM
* A parameter was NULL, or the usage value was not recognized.
*/
vpx_codec_err_t vpx_codec_enc_config_set(vpx_codec_ctx_t *ctx,
const vpx_codec_enc_cfg_t *cfg);
/*!\brief Get global stream headers
*
* Retrieves a stream level global header packet, if supported by the codec.
*
* \param[in] ctx Pointer to this instance's context
*
* \retval NULL
* Encoder does not support global header
* \retval Non-NULL
* Pointer to buffer containing global header packet
*/
vpx_fixed_buf_t *vpx_codec_get_global_headers(vpx_codec_ctx_t *ctx);
/*!\brief deadline parameter analogous to VPx REALTIME mode. */
#define VPX_DL_REALTIME (1)
/*!\brief deadline parameter analogous to VPx GOOD QUALITY mode. */
#define VPX_DL_GOOD_QUALITY (1000000)
/*!\brief deadline parameter analogous to VPx BEST QUALITY mode. */
#define VPX_DL_BEST_QUALITY (0)
/*!\brief Encode a frame
*
* Encodes a video frame at the given "presentation time." The presentation
* time stamp (PTS) \ref MUST be strictly increasing.
*
* The encoder supports the notion of a soft real-time deadline. Given a
* non-zero value to the deadline parameter, the encoder will make a "best
* effort" guarantee to return before the given time slice expires. It is
* implicit that limiting the available time to encode will degrade the
* output quality. The encoder can be given an unlimited time to produce the
* best possible frame by specifying a deadline of '0'. This deadline
* supersedes the VPx notion of "best quality, good quality, realtime".
* Applications that wish to map these former settings to the new deadline
* based system can use the symbols #VPX_DL_REALTIME, #VPX_DL_GOOD_QUALITY,
* and #VPX_DL_BEST_QUALITY.
*
* When the last frame has been passed to the encoder, this function should
* continue to be called, with the img parameter set to NULL. This will
* signal the end-of-stream condition to the encoder and allow it to encode
* any held buffers. Encoding is complete when vpx_codec_encode() is called
* and vpx_codec_get_cx_data() returns no data.
*
* \param[in] ctx Pointer to this instance's context
* \param[in] img Image data to encode, NULL to flush.
* \param[in] pts Presentation time stamp, in timebase units.
* \param[in] duration Duration to show frame, in timebase units.
* \param[in] flags Flags to use for encoding this frame.
* \param[in] deadline Time to spend encoding, in microseconds. (0=infinite)
*
* \retval #VPX_CODEC_OK
* The configuration was populated.
* \retval #VPX_CODEC_INCAPABLE
* Interface is not an encoder interface.
* \retval #VPX_CODEC_INVALID_PARAM
* A parameter was NULL, the image format is unsupported, etc.
*/
vpx_codec_err_t vpx_codec_encode(vpx_codec_ctx_t *ctx, const vpx_image_t *img,
vpx_codec_pts_t pts, unsigned long duration,
vpx_enc_frame_flags_t flags,
unsigned long deadline);
/*!\brief Set compressed data output buffer
*
* Sets the buffer that the codec should output the compressed data
* into. This call effectively sets the buffer pointer returned in the
* next VPX_CODEC_CX_FRAME_PKT packet. Subsequent packets will be
* appended into this buffer. The buffer is preserved across frames,
* so applications must periodically call this function after flushing
* the accumulated compressed data to disk or to the network to reset
* the pointer to the buffer's head.
*
* `pad_before` bytes will be skipped before writing the compressed
* data, and `pad_after` bytes will be appended to the packet. The size
* of the packet will be the sum of the size of the actual compressed
* data, pad_before, and pad_after. The padding bytes will be preserved
* (not overwritten).
*
* Note that calling this function does not guarantee that the returned
* compressed data will be placed into the specified buffer. In the
* event that the encoded data will not fit into the buffer provided,
* the returned packet \ref MAY point to an internal buffer, as it would
* if this call were never used. In this event, the output packet will
* NOT have any padding, and the application must free space and copy it
* to the proper place. This is of particular note in configurations
* that may output multiple packets for a single encoded frame (e.g., lagged
* encoding) or if the application does not reset the buffer periodically.
*
* Applications may restore the default behavior of the codec providing
* the compressed data buffer by calling this function with a NULL
* buffer.
*
* Applications \ref MUSTNOT call this function during iteration of
* vpx_codec_get_cx_data().
*
* \param[in] ctx Pointer to this instance's context
* \param[in] buf Buffer to store compressed data into
* \param[in] pad_before Bytes to skip before writing compressed data
* \param[in] pad_after Bytes to skip after writing compressed data
*
* \retval #VPX_CODEC_OK
* The buffer was set successfully.
* \retval #VPX_CODEC_INVALID_PARAM
* A parameter was NULL, the image format is unsupported, etc.
*/
vpx_codec_err_t vpx_codec_set_cx_data_buf(vpx_codec_ctx_t *ctx,
const vpx_fixed_buf_t *buf,
unsigned int pad_before,
unsigned int pad_after);
/*!\brief Encoded data iterator
*
* Iterates over a list of data packets to be passed from the encoder to the
* application. The different kinds of packets available are enumerated in
* #vpx_codec_cx_pkt_kind.
*
* #VPX_CODEC_CX_FRAME_PKT packets should be passed to the application's
* muxer. Multiple compressed frames may be in the list.
* #VPX_CODEC_STATS_PKT packets should be appended to a global buffer.
*
* The application \ref MUST silently ignore any packet kinds that it does
* not recognize or support.
*
* The data buffers returned from this function are only guaranteed to be
* valid until the application makes another call to any vpx_codec_* function.
*
* \param[in] ctx Pointer to this instance's context
* \param[in,out] iter Iterator storage, initialized to NULL
*
* \return Returns a pointer to an output data packet (compressed frame data,
* two-pass statistics, etc.) or NULL to signal end-of-list.
*
*/
const vpx_codec_cx_pkt_t *vpx_codec_get_cx_data(vpx_codec_ctx_t *ctx,
vpx_codec_iter_t *iter);
/*!\brief Get Preview Frame
*
* Returns an image that can be used as a preview. Shows the image as it would
* exist at the decompressor. The application \ref MUST NOT write into this
* image buffer.
*
* \param[in] ctx Pointer to this instance's context
*
* \return Returns a pointer to a preview image, or NULL if no image is
* available.
*
*/
const vpx_image_t *vpx_codec_get_preview_frame(vpx_codec_ctx_t *ctx);
/*!@} - end defgroup encoder*/
#ifdef __cplusplus
}
#endif
#endif // VPX_VPX_VPX_ENCODER_H_