summaryrefslogtreecommitdiffstats
path: root/libavutil/frame.c
blob: e4038096c2c8800a25949f4ee2dd597222e64ae3 (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
/*
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "channel_layout.h"
#include "avassert.h"
#include "buffer.h"
#include "common.h"
#include "dict.h"
#include "frame.h"
#include "imgutils.h"
#include "mem.h"
#include "samplefmt.h"

#if FF_API_FRAME_GET_SET
MAKE_ACCESSORS(AVFrame, frame, int64_t, best_effort_timestamp)
MAKE_ACCESSORS(AVFrame, frame, int64_t, pkt_duration)
MAKE_ACCESSORS(AVFrame, frame, int64_t, pkt_pos)
MAKE_ACCESSORS(AVFrame, frame, int64_t, channel_layout)
MAKE_ACCESSORS(AVFrame, frame, int,     channels)
MAKE_ACCESSORS(AVFrame, frame, int,     sample_rate)
MAKE_ACCESSORS(AVFrame, frame, AVDictionary *, metadata)
MAKE_ACCESSORS(AVFrame, frame, int,     decode_error_flags)
MAKE_ACCESSORS(AVFrame, frame, int,     pkt_size)
MAKE_ACCESSORS(AVFrame, frame, enum AVColorSpace, colorspace)
MAKE_ACCESSORS(AVFrame, frame, enum AVColorRange, color_range)
#endif

#define CHECK_CHANNELS_CONSISTENCY(frame) \
    av_assert2(!(frame)->channel_layout || \
               (frame)->channels == \
               av_get_channel_layout_nb_channels((frame)->channel_layout))

#if FF_API_FRAME_QP
struct qp_properties {
    int stride;
    int type;
};

int av_frame_set_qp_table(AVFrame *f, AVBufferRef *buf, int stride, int qp_type)
{
    struct qp_properties *p;
    AVFrameSideData *sd;
    AVBufferRef *ref;

FF_DISABLE_DEPRECATION_WARNINGS
    av_buffer_unref(&f->qp_table_buf);

    f->qp_table_buf = buf;
    f->qscale_table = buf->data;
    f->qstride      = stride;
    f->qscale_type  = qp_type;
FF_ENABLE_DEPRECATION_WARNINGS

    av_frame_remove_side_data(f, AV_FRAME_DATA_QP_TABLE_PROPERTIES);
    av_frame_remove_side_data(f, AV_FRAME_DATA_QP_TABLE_DATA);

    ref = av_buffer_ref(buf);
    if (!av_frame_new_side_data_from_buf(f, AV_FRAME_DATA_QP_TABLE_DATA, ref)) {
        av_buffer_unref(&ref);
        return AVERROR(ENOMEM);
    }

    sd = av_frame_new_side_data(f, AV_FRAME_DATA_QP_TABLE_PROPERTIES,
                                sizeof(struct qp_properties));
    if (!sd)
        return AVERROR(ENOMEM);

    p = (struct qp_properties *)sd->data;
    p->stride = stride;
    p->type = qp_type;

    return 0;
}

int8_t *av_frame_get_qp_table(AVFrame *f, int *stride, int *type)
{
    AVBufferRef *buf = NULL;

    *stride = 0;
    *type   = 0;

FF_DISABLE_DEPRECATION_WARNINGS
    if (f->qp_table_buf) {
        *stride = f->qstride;
        *type   = f->qscale_type;
        buf     = f->qp_table_buf;
FF_ENABLE_DEPRECATION_WARNINGS
    } else {
        AVFrameSideData *sd;
        struct qp_properties *p;
        sd = av_frame_get_side_data(f, AV_FRAME_DATA_QP_TABLE_PROPERTIES);
        if (!sd)
            return NULL;
        p = (struct qp_properties *)sd->data;
        sd = av_frame_get_side_data(f, AV_FRAME_DATA_QP_TABLE_DATA);
        if (!sd)
            return NULL;
        *stride = p->stride;
        *type   = p->type;
        buf     = sd->buf;
    }

    return buf ? buf->data : NULL;
}
#endif

const char *av_get_colorspace_name(enum AVColorSpace val)
{
    static const char * const name[] = {
        [AVCOL_SPC_RGB]       = "GBR",
        [AVCOL_SPC_BT709]     = "bt709",
        [AVCOL_SPC_FCC]       = "fcc",
        [AVCOL_SPC_BT470BG]   = "bt470bg",
        [AVCOL_SPC_SMPTE170M] = "smpte170m",
        [AVCOL_SPC_SMPTE240M] = "smpte240m",
        [AVCOL_SPC_YCOCG]     = "YCgCo",
    };
    if ((unsigned)val >= FF_ARRAY_ELEMS(name))
        return NULL;
    return name[val];
}

static void get_frame_defaults(AVFrame *frame)
{
    if (frame->extended_data != frame->data)
        av_freep(&frame->extended_data);

    memset(frame, 0, sizeof(*frame));

    frame->pts                   =
    frame->pkt_dts               = AV_NOPTS_VALUE;
#if FF_API_PKT_PTS
FF_DISABLE_DEPRECATION_WARNINGS
    frame->pkt_pts               = AV_NOPTS_VALUE;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
    frame->best_effort_timestamp = AV_NOPTS_VALUE;
    frame->pkt_duration        = 0;
    frame->pkt_pos             = -1;
    frame->pkt_size            = -1;
    frame->key_frame           = 1;
    frame->sample_aspect_ratio = (AVRational){ 0, 1 };
    frame->format              = -1; /* unknown */
    frame->extended_data       = frame->data;
    frame->color_primaries     = AVCOL_PRI_UNSPECIFIED;
    frame->color_trc           = AVCOL_TRC_UNSPECIFIED;
    frame->colorspace          = AVCOL_SPC_UNSPECIFIED;
    frame->color_range         = AVCOL_RANGE_UNSPECIFIED;
    frame->chroma_location     = AVCHROMA_LOC_UNSPECIFIED;
    frame->flags               = 0;
}

static void free_side_data(AVFrameSideData **ptr_sd)
{
    AVFrameSideData *sd = *ptr_sd;

    av_buffer_unref(&sd->buf);
    av_dict_free(&sd->metadata);
    av_freep(ptr_sd);
}

static void wipe_side_data(AVFrame *frame)
{
    int i;

    for (i = 0; i < frame->nb_side_data; i++) {
        free_side_data(&frame->side_data[i]);
    }
    frame->nb_side_data = 0;

    av_freep(&frame->side_data);
}

AVFrame *av_frame_alloc(void)
{
    AVFrame *frame = av_mallocz(sizeof(*frame));

    if (!frame)
        return NULL;

    frame->extended_data = NULL;
    get_frame_defaults(frame);

    return frame;
}

void av_frame_free(AVFrame **frame)
{
    if (!frame || !*frame)
        return;

    av_frame_unref(*frame);
    av_freep(frame);
}

static int get_video_buffer(AVFrame *frame, int align)
{
    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
    int ret, i, padded_height;
    int plane_padding = FFMAX(16 + 16/*STRIDE_ALIGN*/, align);

    if (!desc)
        return AVERROR(EINVAL);

    if ((ret = av_image_check_size(frame->width, frame->height, 0, NULL)) < 0)
        return ret;

    if (!frame->linesize[0]) {
        if (align <= 0)
            align = 32; /* STRIDE_ALIGN. Should be av_cpu_max_align() */

        for(i=1; i<=align; i+=i) {
            ret = av_image_fill_linesizes(frame->linesize, frame->format,
                                          FFALIGN(frame->width, i));
            if (ret < 0)
                return ret;
            if (!(frame->linesize[0] & (align-1)))
                break;
        }

        for (i = 0; i < 4 && frame->linesize[i]; i++)
            frame->linesize[i] = FFALIGN(frame->linesize[i], align);
    }

    padded_height = FFALIGN(frame->height, 32);
    if ((ret = av_image_fill_pointers(frame->data, frame->format, padded_height,
                                      NULL, frame->linesize)) < 0)
        return ret;

    frame->buf[0] = av_buffer_alloc(ret + 4*plane_padding);
    if (!frame->buf[0]) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    if ((ret = av_image_fill_pointers(frame->data, frame->format, padded_height,
                                      frame->buf[0]->data, frame->linesize)) < 0)
        goto fail;

    for (i = 1; i < 4; i++) {
        if (frame->data[i])
            frame->data[i] += i * plane_padding;
    }

    frame->extended_data = frame->data;

    return 0;
fail:
    av_frame_unref(frame);
    return ret;
}

static int get_audio_buffer(AVFrame *frame, int align)
{
    int channels;
    int planar   = av_sample_fmt_is_planar(frame->format);
    int planes;
    int ret, i;

    if (!frame->channels)
        frame->channels = av_get_channel_layout_nb_channels(frame->channel_layout);

    channels = frame->channels;
    planes = planar ? channels : 1;

    CHECK_CHANNELS_CONSISTENCY(frame);
    if (!frame->linesize[0]) {
        ret = av_samples_get_buffer_size(&frame->linesize[0], channels,
                                         frame->nb_samples, frame->format,
                                         align);
        if (ret < 0)
            return ret;
    }

    if (planes > AV_NUM_DATA_POINTERS) {
        frame->extended_data = av_mallocz_array(planes,
                                          sizeof(*frame->extended_data));
        frame->extended_buf  = av_mallocz_array((planes - AV_NUM_DATA_POINTERS),
                                          sizeof(*frame->extended_buf));
        if (!frame->extended_data || !frame->extended_buf) {
            av_freep(&frame->extended_data);
            av_freep(&frame->extended_buf);
            return AVERROR(ENOMEM);
        }
        frame->nb_extended_buf = planes - AV_NUM_DATA_POINTERS;
    } else
        frame->extended_data = frame->data;

    for (i = 0; i < FFMIN(planes, AV_NUM_DATA_POINTERS); i++) {
        frame->buf[i] = av_buffer_alloc(frame->linesize[0]);
        if (!frame->buf[i]) {
            av_frame_unref(frame);
            return AVERROR(ENOMEM);
        }
        frame->extended_data[i] = frame->data[i] = frame->buf[i]->data;
    }
    for (i = 0; i < planes - AV_NUM_DATA_POINTERS; i++) {
        frame->extended_buf[i] = av_buffer_alloc(frame->linesize[0]);
        if (!frame->extended_buf[i]) {
            av_frame_unref(frame);
            return AVERROR(ENOMEM);
        }
        frame->extended_data[i + AV_NUM_DATA_POINTERS] = frame->extended_buf[i]->data;
    }
    return 0;

}

int av_frame_get_buffer(AVFrame *frame, int align)
{
    if (frame->format < 0)
        return AVERROR(EINVAL);

    if (frame->width > 0 && frame->height > 0)
        return get_video_buffer(frame, align);
    else if (frame->nb_samples > 0 && (frame->channel_layout || frame->channels > 0))
        return get_audio_buffer(frame, align);

    return AVERROR(EINVAL);
}

static int frame_copy_props(AVFrame *dst, const AVFrame *src, int force_copy)
{
    int i;

    dst->key_frame              = src->key_frame;
    dst->pict_type              = src->pict_type;
    dst->sample_aspect_ratio    = src->sample_aspect_ratio;
    dst->crop_top               = src->crop_top;
    dst->crop_bottom            = src->crop_bottom;
    dst->crop_left              = src->crop_left;
    dst->crop_right             = src->crop_right;
    dst->pts                    = src->pts;
    dst->repeat_pict            = src->repeat_pict;
    dst->interlaced_frame       = src->interlaced_frame;
    dst->top_field_first        = src->top_field_first;
    dst->palette_has_changed    = src->palette_has_changed;
    dst->sample_rate            = src->sample_rate;
    dst->opaque                 = src->opaque;
#if FF_API_PKT_PTS
FF_DISABLE_DEPRECATION_WARNINGS
    dst->pkt_pts                = src->pkt_pts;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
    dst->pkt_dts                = src->pkt_dts;
    dst->pkt_pos                = src->pkt_pos;
    dst->pkt_size               = src->pkt_size;
    dst->pkt_duration           = src->pkt_duration;
    dst->reordered_opaque       = src->reordered_opaque;
    dst->quality                = src->quality;
    dst->best_effort_timestamp  = src->best_effort_timestamp;
    dst->coded_picture_number   = src->coded_picture_number;
    dst->display_picture_number = src->display_picture_number;
    dst->flags                  = src->flags;
    dst->decode_error_flags     = src->decode_error_flags;
    dst->color_primaries        = src->color_primaries;
    dst->color_trc              = src->color_trc;
    dst->colorspace             = src->colorspace;
    dst->color_range            = src->color_range;
    dst->chroma_location        = src->chroma_location;

    av_dict_copy(&dst->metadata, src->metadata, 0);

#if FF_API_ERROR_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
    memcpy(dst->error, src->error, sizeof(dst->error));
FF_ENABLE_DEPRECATION_WARNINGS
#endif

    for (i = 0; i < src->nb_side_data; i++) {
        const AVFrameSideData *sd_src = src->side_data[i];
        AVFrameSideData *sd_dst;
        if (   sd_src->type == AV_FRAME_DATA_PANSCAN
            && (src->width != dst->width || src->height != dst->height))
            continue;
        if (force_copy) {
            sd_dst = av_frame_new_side_data(dst, sd_src->type,
                                            sd_src->size);
            if (!sd_dst) {
                wipe_side_data(dst);
                return AVERROR(ENOMEM);
            }
            memcpy(sd_dst->data, sd_src->data, sd_src->size);
        } else {
            AVBufferRef *ref = av_buffer_ref(sd_src->buf);
            sd_dst = av_frame_new_side_data_from_buf(dst, sd_src->type, ref);
            if (!sd_dst) {
                av_buffer_unref(&ref);
                wipe_side_data(dst);
                return AVERROR(ENOMEM);
            }
        }
        av_dict_copy(&sd_dst->metadata, sd_src->metadata, 0);
    }

#if FF_API_FRAME_QP
FF_DISABLE_DEPRECATION_WARNINGS
    dst->qscale_table = NULL;
    dst->qstride      = 0;
    dst->qscale_type  = 0;
    av_buffer_unref(&dst->qp_table_buf);
    if (src->qp_table_buf) {
        dst->qp_table_buf = av_buffer_ref(src->qp_table_buf);
        if (dst->qp_table_buf) {
            dst->qscale_table = dst->qp_table_buf->data;
            dst->qstride      = src->qstride;
            dst->qscale_type  = src->qscale_type;
        }
    }
FF_ENABLE_DEPRECATION_WARNINGS
#endif

    av_buffer_unref(&dst->opaque_ref);
    av_buffer_unref(&dst->private_ref);
    if (src->opaque_ref) {
        dst->opaque_ref = av_buffer_ref(src->opaque_ref);
        if (!dst->opaque_ref)
            return AVERROR(ENOMEM);
    }
    if (src->private_ref) {
        dst->private_ref = av_buffer_ref(src->private_ref);
        if (!dst->private_ref)
            return AVERROR(ENOMEM);
    }
    return 0;
}

int av_frame_ref(AVFrame *dst, const AVFrame *src)
{
    int i, ret = 0;

    av_assert1(dst->width == 0 && dst->height == 0);
    av_assert1(dst->channels == 0);

    dst->format         = src->format;
    dst->width          = src->width;
    dst->height         = src->height;
    dst->channels       = src->channels;
    dst->channel_layout = src->channel_layout;
    dst->nb_samples     = src->nb_samples;

    ret = frame_copy_props(dst, src, 0);
    if (ret < 0)
        return ret;

    /* duplicate the frame data if it's not refcounted */
    if (!src->buf[0]) {
        ret = av_frame_get_buffer(dst, 32);
        if (ret < 0)
            return ret;

        ret = av_frame_copy(dst, src);
        if (ret < 0)
            av_frame_unref(dst);

        return ret;
    }

    /* ref the buffers */
    for (i = 0; i < FF_ARRAY_ELEMS(src->buf); i++) {
        if (!src->buf[i])
            continue;
        dst->buf[i] = av_buffer_ref(src->buf[i]);
        if (!dst->buf[i]) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
    }

    if (src->extended_buf) {
        dst->extended_buf = av_mallocz_array(sizeof(*dst->extended_buf),
                                       src->nb_extended_buf);
        if (!dst->extended_buf) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
        dst->nb_extended_buf = src->nb_extended_buf;

        for (i = 0; i < src->nb_extended_buf; i++) {
            dst->extended_buf[i] = av_buffer_ref(src->extended_buf[i]);
            if (!dst->extended_buf[i]) {
                ret = AVERROR(ENOMEM);
                goto fail;
            }
        }
    }

    if (src->hw_frames_ctx) {
        dst->hw_frames_ctx = av_buffer_ref(src->hw_frames_ctx);
        if (!dst->hw_frames_ctx) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
    }

    /* duplicate extended data */
    if (src->extended_data != src->data) {
        int ch = src->channels;

        if (!ch) {
            ret = AVERROR(EINVAL);
            goto fail;
        }
        CHECK_CHANNELS_CONSISTENCY(src);

        dst->extended_data = av_malloc_array(sizeof(*dst->extended_data), ch);
        if (!dst->extended_data) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
        memcpy(dst->extended_data, src->extended_data, sizeof(*src->extended_data) * ch);
    } else
        dst->extended_data = dst->data;

    memcpy(dst->data,     src->data,     sizeof(src->data));
    memcpy(dst->linesize, src->linesize, sizeof(src->linesize));

    return 0;

fail:
    av_frame_unref(dst);
    return ret;
}

AVFrame *av_frame_clone(const AVFrame *src)
{
    AVFrame *ret = av_frame_alloc();

    if (!ret)
        return NULL;

    if (av_frame_ref(ret, src) < 0)
        av_frame_free(&ret);

    return ret;
}

void av_frame_unref(AVFrame *frame)
{
    int i;

    if (!frame)
        return;

    wipe_side_data(frame);

    for (i = 0; i < FF_ARRAY_ELEMS(frame->buf); i++)
        av_buffer_unref(&frame->buf[i]);
    for (i = 0; i < frame->nb_extended_buf; i++)
        av_buffer_unref(&frame->extended_buf[i]);
    av_freep(&frame->extended_buf);
    av_dict_free(&frame->metadata);
#if FF_API_FRAME_QP
FF_DISABLE_DEPRECATION_WARNINGS
    av_buffer_unref(&frame->qp_table_buf);
FF_ENABLE_DEPRECATION_WARNINGS
#endif

    av_buffer_unref(&frame->hw_frames_ctx);

    av_buffer_unref(&frame->opaque_ref);
    av_buffer_unref(&frame->private_ref);

    get_frame_defaults(frame);
}

void av_frame_move_ref(AVFrame *dst, AVFrame *src)
{
    av_assert1(dst->width == 0 && dst->height == 0);
    av_assert1(dst->channels == 0);

    *dst = *src;
    if (src->extended_data == src->data)
        dst->extended_data = dst->data;
    memset(src, 0, sizeof(*src));
    get_frame_defaults(src);
}

int av_frame_is_writable(AVFrame *frame)
{
    int i, ret = 1;

    /* assume non-refcounted frames are not writable */
    if (!frame->buf[0])
        return 0;

    for (i = 0; i < FF_ARRAY_ELEMS(frame->buf); i++)
        if (frame->buf[i])
            ret &= !!av_buffer_is_writable(frame->buf[i]);
    for (i = 0; i < frame->nb_extended_buf; i++)
        ret &= !!av_buffer_is_writable(frame->extended_buf[i]);

    return ret;
}

int av_frame_make_writable(AVFrame *frame)
{
    AVFrame tmp;
    int ret;

    if (!frame->buf[0])
        return AVERROR(EINVAL);

    if (av_frame_is_writable(frame))
        return 0;

    memset(&tmp, 0, sizeof(tmp));
    tmp.format         = frame->format;
    tmp.width          = frame->width;
    tmp.height         = frame->height;
    tmp.channels       = frame->channels;
    tmp.channel_layout = frame->channel_layout;
    tmp.nb_samples     = frame->nb_samples;
    ret = av_frame_get_buffer(&tmp, 32);
    if (ret < 0)
        return ret;

    ret = av_frame_copy(&tmp, frame);
    if (ret < 0) {
        av_frame_unref(&tmp);
        return ret;
    }

    ret = av_frame_copy_props(&tmp, frame);
    if (ret < 0) {
        av_frame_unref(&tmp);
        return ret;
    }

    av_frame_unref(frame);

    *frame = tmp;
    if (tmp.data == tmp.extended_data)
        frame->extended_data = frame->data;

    return 0;
}

int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
{
    return frame_copy_props(dst, src, 1);
}

AVBufferRef *av_frame_get_plane_buffer(AVFrame *frame, int plane)
{
    uint8_t *data;
    int planes, i;

    if (frame->nb_samples) {
        int channels = frame->channels;
        if (!channels)
            return NULL;
        CHECK_CHANNELS_CONSISTENCY(frame);
        planes = av_sample_fmt_is_planar(frame->format) ? channels : 1;
    } else
        planes = 4;

    if (plane < 0 || plane >= planes || !frame->extended_data[plane])
        return NULL;
    data = frame->extended_data[plane];

    for (i = 0; i < FF_ARRAY_ELEMS(frame->buf) && frame->buf[i]; i++) {
        AVBufferRef *buf = frame->buf[i];
        if (data >= buf->data && data < buf->data + buf->size)
            return buf;
    }
    for (i = 0; i < frame->nb_extended_buf; i++) {
        AVBufferRef *buf = frame->extended_buf[i];
        if (data >= buf->data && data < buf->data + buf->size)
            return buf;
    }
    return NULL;
}

AVFrameSideData *av_frame_new_side_data_from_buf(AVFrame *frame,
                                                 enum AVFrameSideDataType type,
                                                 AVBufferRef *buf)
{
    AVFrameSideData *ret, **tmp;

    if (!buf)
        return NULL;

    if (frame->nb_side_data > INT_MAX / sizeof(*frame->side_data) - 1)
        return NULL;

    tmp = av_realloc(frame->side_data,
                     (frame->nb_side_data + 1) * sizeof(*frame->side_data));
    if (!tmp)
        return NULL;
    frame->side_data = tmp;

    ret = av_mallocz(sizeof(*ret));
    if (!ret)
        return NULL;

    ret->buf = buf;
    ret->data = ret->buf->data;
    ret->size = buf->size;
    ret->type = type;

    frame->side_data[frame->nb_side_data++] = ret;

    return ret;
}

AVFrameSideData *av_frame_new_side_data(AVFrame *frame,
                                        enum AVFrameSideDataType type,
                                        int size)
{
    AVFrameSideData *ret;
    AVBufferRef *buf = av_buffer_alloc(size);
    ret = av_frame_new_side_data_from_buf(frame, type, buf);
    if (!ret)
        av_buffer_unref(&buf);
    return ret;
}

AVFrameSideData *av_frame_get_side_data(const AVFrame *frame,
                                        enum AVFrameSideDataType type)
{
    int i;

    for (i = 0; i < frame->nb_side_data; i++) {
        if (frame->side_data[i]->type == type)
            return frame->side_data[i];
    }
    return NULL;
}

static int frame_copy_video(AVFrame *dst, const AVFrame *src)
{
    const uint8_t *src_data[4];
    int i, planes;

    if (dst->width  < src->width ||
        dst->height < src->height)
        return AVERROR(EINVAL);

    planes = av_pix_fmt_count_planes(dst->format);
    for (i = 0; i < planes; i++)
        if (!dst->data[i] || !src->data[i])
            return AVERROR(EINVAL);

    memcpy(src_data, src->data, sizeof(src_data));
    av_image_copy(dst->data, dst->linesize,
                  src_data, src->linesize,
                  dst->format, src->width, src->height);

    return 0;
}

static int frame_copy_audio(AVFrame *dst, const AVFrame *src)
{
    int planar   = av_sample_fmt_is_planar(dst->format);
    int channels = dst->channels;
    int planes   = planar ? channels : 1;
    int i;

    if (dst->nb_samples     != src->nb_samples ||
        dst->channels       != src->channels ||
        dst->channel_layout != src->channel_layout)
        return AVERROR(EINVAL);

    CHECK_CHANNELS_CONSISTENCY(src);

    for (i = 0; i < planes; i++)
        if (!dst->extended_data[i] || !src->extended_data[i])
            return AVERROR(EINVAL);

    av_samples_copy(dst->extended_data, src->extended_data, 0, 0,
                    dst->nb_samples, channels, dst->format);

    return 0;
}

int av_frame_copy(AVFrame *dst, const AVFrame *src)
{
    if (dst->format != src->format || dst->format < 0)
        return AVERROR(EINVAL);

    if (dst->width > 0 && dst->height > 0)
        return frame_copy_video(dst, src);
    else if (dst->nb_samples > 0 && dst->channels > 0)
        return frame_copy_audio(dst, src);

    return AVERROR(EINVAL);
}

void av_frame_remove_side_data(AVFrame *frame, enum AVFrameSideDataType type)
{
    int i;

    for (i = frame->nb_side_data - 1; i >= 0; i--) {
        AVFrameSideData *sd = frame->side_data[i];
        if (sd->type == type) {
            free_side_data(&frame->side_data[i]);
            frame->side_data[i] = frame->side_data[frame->nb_side_data - 1];
            frame->nb_side_data--;
        }
    }
}

const char *av_frame_side_data_name(enum AVFrameSideDataType type)
{
    switch(type) {
    case AV_FRAME_DATA_PANSCAN:         return "AVPanScan";
    case AV_FRAME_DATA_A53_CC:          return "ATSC A53 Part 4 Closed Captions";
    case AV_FRAME_DATA_STEREO3D:        return "Stereo 3D";
    case AV_FRAME_DATA_MATRIXENCODING:  return "AVMatrixEncoding";
    case AV_FRAME_DATA_DOWNMIX_INFO:    return "Metadata relevant to a downmix procedure";
    case AV_FRAME_DATA_REPLAYGAIN:      return "AVReplayGain";
    case AV_FRAME_DATA_DISPLAYMATRIX:   return "3x3 displaymatrix";
    case AV_FRAME_DATA_AFD:             return "Active format description";
    case AV_FRAME_DATA_MOTION_VECTORS:  return "Motion vectors";
    case AV_FRAME_DATA_SKIP_SAMPLES:    return "Skip samples";
    case AV_FRAME_DATA_AUDIO_SERVICE_TYPE:          return "Audio service type";
    case AV_FRAME_DATA_MASTERING_DISPLAY_METADATA:  return "Mastering display metadata";
    case AV_FRAME_DATA_CONTENT_LIGHT_LEVEL:         return "Content light level metadata";
    case AV_FRAME_DATA_GOP_TIMECODE:                return "GOP timecode";
    case AV_FRAME_DATA_S12M_TIMECODE:               return "SMPTE 12-1 timecode";
    case AV_FRAME_DATA_SPHERICAL:                   return "Spherical Mapping";
    case AV_FRAME_DATA_ICC_PROFILE:                 return "ICC profile";
#if FF_API_FRAME_QP
    case AV_FRAME_DATA_QP_TABLE_PROPERTIES:         return "QP table properties";
    case AV_FRAME_DATA_QP_TABLE_DATA:               return "QP table data";
#endif
    case AV_FRAME_DATA_DYNAMIC_HDR_PLUS: return "HDR Dynamic Metadata SMPTE2094-40 (HDR10+)";
    case AV_FRAME_DATA_REGIONS_OF_INTEREST: return "Regions Of Interest";
    }
    return NULL;
}

static int calc_cropping_offsets(size_t offsets[4], const AVFrame *frame,
                                 const AVPixFmtDescriptor *desc)
{
    int i, j;

    for (i = 0; frame->data[i]; i++) {
        const AVComponentDescriptor *comp = NULL;
        int shift_x = (i == 1 || i == 2) ? desc->log2_chroma_w : 0;
        int shift_y = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;

        if (desc->flags & (AV_PIX_FMT_FLAG_PAL | FF_PSEUDOPAL) && i == 1) {
            offsets[i] = 0;
            break;
        }

        /* find any component descriptor for this plane */
        for (j = 0; j < desc->nb_components; j++) {
            if (desc->comp[j].plane == i) {
                comp = &desc->comp[j];
                break;
            }
        }
        if (!comp)
            return AVERROR_BUG;

        offsets[i] = (frame->crop_top  >> shift_y) * frame->linesize[i] +
                     (frame->crop_left >> shift_x) * comp->step;
    }

    return 0;
}

int av_frame_apply_cropping(AVFrame *frame, int flags)
{
    const AVPixFmtDescriptor *desc;
    size_t offsets[4];
    int i;

    if (!(frame->width > 0 && frame->height > 0))
        return AVERROR(EINVAL);

    if (frame->crop_left >= INT_MAX - frame->crop_right        ||
        frame->crop_top  >= INT_MAX - frame->crop_bottom       ||
        (frame->crop_left + frame->crop_right) >= frame->width ||
        (frame->crop_top + frame->crop_bottom) >= frame->height)
        return AVERROR(ERANGE);

    desc = av_pix_fmt_desc_get(frame->format);
    if (!desc)
        return AVERROR_BUG;

    /* Apply just the right/bottom cropping for hwaccel formats. Bitstream
     * formats cannot be easily handled here either (and corresponding decoders
     * should not export any cropping anyway), so do the same for those as well.
     * */
    if (desc->flags & (AV_PIX_FMT_FLAG_BITSTREAM | AV_PIX_FMT_FLAG_HWACCEL)) {
        frame->width      -= frame->crop_right;
        frame->height     -= frame->crop_bottom;
        frame->crop_right  = 0;
        frame->crop_bottom = 0;
        return 0;
    }

    /* calculate the offsets for each plane */
    calc_cropping_offsets(offsets, frame, desc);

    /* adjust the offsets to avoid breaking alignment */
    if (!(flags & AV_FRAME_CROP_UNALIGNED)) {
        int log2_crop_align = frame->crop_left ? ff_ctz(frame->crop_left) : INT_MAX;
        int min_log2_align = INT_MAX;

        for (i = 0; frame->data[i]; i++) {
            int log2_align = offsets[i] ? ff_ctz(offsets[i]) : INT_MAX;
            min_log2_align = FFMIN(log2_align, min_log2_align);
        }

        /* we assume, and it should always be true, that the data alignment is
         * related to the cropping alignment by a constant power-of-2 factor */
        if (log2_crop_align < min_log2_align)
            return AVERROR_BUG;

        if (min_log2_align < 5) {
            frame->crop_left &= ~((1 << (5 + log2_crop_align - min_log2_align)) - 1);
            calc_cropping_offsets(offsets, frame, desc);
        }
    }

    for (i = 0; frame->data[i]; i++)
        frame->data[i] += offsets[i];

    frame->width      -= (frame->crop_left + frame->crop_right);
    frame->height     -= (frame->crop_top  + frame->crop_bottom);
    frame->crop_left   = 0;
    frame->crop_right  = 0;
    frame->crop_top    = 0;
    frame->crop_bottom = 0;

    return 0;
}
OpenPOWER on IntegriCloud