summaryrefslogtreecommitdiffstats
path: root/libavcodec/imgresample.c
blob: 5b720b2326fd53cbc796c729588a17fccf8a58cf (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
/*
 * High quality image resampling with polyphase filters
 * Copyright (c) 2001 Fabrice Bellard.
 *
 * 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
 */

/**
 * @file imgresample.c
 * High quality image resampling with polyphase filters .
 */

#include "avcodec.h"
#include "swscale.h"
#include "dsputil.h"

#ifdef HAVE_ALTIVEC
#include "ppc/imgresample_altivec.h"
#endif

#define NB_COMPONENTS 3

#define PHASE_BITS 4
#define NB_PHASES  (1 << PHASE_BITS)
#define NB_TAPS    4
#define FCENTER    1  /* index of the center of the filter */
//#define TEST    1  /* Test it */

#define POS_FRAC_BITS 16
#define POS_FRAC      (1 << POS_FRAC_BITS)
/* 6 bits precision is needed for MMX */
#define FILTER_BITS   8

#define LINE_BUF_HEIGHT (NB_TAPS * 4)

struct SwsContext {
    const AVClass *av_class;
    struct ImgReSampleContext *resampling_ctx;
    enum PixelFormat src_pix_fmt, dst_pix_fmt;
};

struct ImgReSampleContext {
    int iwidth, iheight, owidth, oheight;
    int topBand, bottomBand, leftBand, rightBand;
    int padtop, padbottom, padleft, padright;
    int pad_owidth, pad_oheight;
    int h_incr, v_incr;
    DECLARE_ALIGNED_8(int16_t, h_filters[NB_PHASES][NB_TAPS]); /* horizontal filters */
    DECLARE_ALIGNED_8(int16_t, v_filters[NB_PHASES][NB_TAPS]); /* vertical filters */
    uint8_t *line_buf;
};

void av_build_filter(int16_t *filter, double factor, int tap_count, int phase_count, int scale, int type);

static inline int get_phase(int pos)
{
    return ((pos) >> (POS_FRAC_BITS - PHASE_BITS)) & ((1 << PHASE_BITS) - 1);
}

/* This function must be optimized */
static void h_resample_fast(uint8_t *dst, int dst_width, const uint8_t *src,
                            int src_width, int src_start, int src_incr,
                            int16_t *filters)
{
    int src_pos, phase, sum, i;
    const uint8_t *s;
    int16_t *filter;

    src_pos = src_start;
    for(i=0;i<dst_width;i++) {
#ifdef TEST
        /* test */
        if ((src_pos >> POS_FRAC_BITS) < 0 ||
            (src_pos >> POS_FRAC_BITS) > (src_width - NB_TAPS))
            av_abort();
#endif
        s = src + (src_pos >> POS_FRAC_BITS);
        phase = get_phase(src_pos);
        filter = filters + phase * NB_TAPS;
#if NB_TAPS == 4
        sum = s[0] * filter[0] +
            s[1] * filter[1] +
            s[2] * filter[2] +
            s[3] * filter[3];
#else
        {
            int j;
            sum = 0;
            for(j=0;j<NB_TAPS;j++)
                sum += s[j] * filter[j];
        }
#endif
        sum = sum >> FILTER_BITS;
        if (sum < 0)
            sum = 0;
        else if (sum > 255)
            sum = 255;
        dst[0] = sum;
        src_pos += src_incr;
        dst++;
    }
}

/* This function must be optimized */
static void v_resample(uint8_t *dst, int dst_width, const uint8_t *src,
                       int wrap, int16_t *filter)
{
    int sum, i;
    const uint8_t *s;

    s = src;
    for(i=0;i<dst_width;i++) {
#if NB_TAPS == 4
        sum = s[0 * wrap] * filter[0] +
            s[1 * wrap] * filter[1] +
            s[2 * wrap] * filter[2] +
            s[3 * wrap] * filter[3];
#else
        {
            int j;
            uint8_t *s1 = s;

            sum = 0;
            for(j=0;j<NB_TAPS;j++) {
                sum += s1[0] * filter[j];
                s1 += wrap;
            }
        }
#endif
        sum = sum >> FILTER_BITS;
        if (sum < 0)
            sum = 0;
        else if (sum > 255)
            sum = 255;
        dst[0] = sum;
        dst++;
        s++;
    }
}

#ifdef HAVE_MMX

#include "i386/mmx.h"

#define FILTER4(reg) \
{\
        s = src + (src_pos >> POS_FRAC_BITS);\
        phase = get_phase(src_pos);\
        filter = filters + phase * NB_TAPS;\
        movq_m2r(*s, reg);\
        punpcklbw_r2r(mm7, reg);\
        movq_m2r(*filter, mm6);\
        pmaddwd_r2r(reg, mm6);\
        movq_r2r(mm6, reg);\
        psrlq_i2r(32, reg);\
        paddd_r2r(mm6, reg);\
        psrad_i2r(FILTER_BITS, reg);\
        src_pos += src_incr;\
}

#define DUMP(reg) movq_r2m(reg, tmp); printf(#reg "=%016"PRIx64"\n", tmp.uq);

/* XXX: do four pixels at a time */
static void h_resample_fast4_mmx(uint8_t *dst, int dst_width,
                                 const uint8_t *src, int src_width,
                                 int src_start, int src_incr, int16_t *filters)
{
    int src_pos, phase;
    const uint8_t *s;
    int16_t *filter;
    mmx_t tmp;

    src_pos = src_start;
    pxor_r2r(mm7, mm7);

    while (dst_width >= 4) {

        FILTER4(mm0);
        FILTER4(mm1);
        FILTER4(mm2);
        FILTER4(mm3);

        packuswb_r2r(mm7, mm0);
        packuswb_r2r(mm7, mm1);
        packuswb_r2r(mm7, mm3);
        packuswb_r2r(mm7, mm2);
        movq_r2m(mm0, tmp);
        dst[0] = tmp.ub[0];
        movq_r2m(mm1, tmp);
        dst[1] = tmp.ub[0];
        movq_r2m(mm2, tmp);
        dst[2] = tmp.ub[0];
        movq_r2m(mm3, tmp);
        dst[3] = tmp.ub[0];
        dst += 4;
        dst_width -= 4;
    }
    while (dst_width > 0) {
        FILTER4(mm0);
        packuswb_r2r(mm7, mm0);
        movq_r2m(mm0, tmp);
        dst[0] = tmp.ub[0];
        dst++;
        dst_width--;
    }
    emms();
}

static void v_resample4_mmx(uint8_t *dst, int dst_width, const uint8_t *src,
                            int wrap, int16_t *filter)
{
    int sum, i, v;
    const uint8_t *s;
    mmx_t tmp;
    mmx_t coefs[4];

    for(i=0;i<4;i++) {
        v = filter[i];
        coefs[i].uw[0] = v;
        coefs[i].uw[1] = v;
        coefs[i].uw[2] = v;
        coefs[i].uw[3] = v;
    }

    pxor_r2r(mm7, mm7);
    s = src;
    while (dst_width >= 4) {
        movq_m2r(s[0 * wrap], mm0);
        punpcklbw_r2r(mm7, mm0);
        movq_m2r(s[1 * wrap], mm1);
        punpcklbw_r2r(mm7, mm1);
        movq_m2r(s[2 * wrap], mm2);
        punpcklbw_r2r(mm7, mm2);
        movq_m2r(s[3 * wrap], mm3);
        punpcklbw_r2r(mm7, mm3);

        pmullw_m2r(coefs[0], mm0);
        pmullw_m2r(coefs[1], mm1);
        pmullw_m2r(coefs[2], mm2);
        pmullw_m2r(coefs[3], mm3);

        paddw_r2r(mm1, mm0);
        paddw_r2r(mm3, mm2);
        paddw_r2r(mm2, mm0);
        psraw_i2r(FILTER_BITS, mm0);

        packuswb_r2r(mm7, mm0);
        movq_r2m(mm0, tmp);

        *(uint32_t *)dst = tmp.ud[0];
        dst += 4;
        s += 4;
        dst_width -= 4;
    }
    while (dst_width > 0) {
        sum = s[0 * wrap] * filter[0] +
            s[1 * wrap] * filter[1] +
            s[2 * wrap] * filter[2] +
            s[3 * wrap] * filter[3];
        sum = sum >> FILTER_BITS;
        if (sum < 0)
            sum = 0;
        else if (sum > 255)
            sum = 255;
        dst[0] = sum;
        dst++;
        s++;
        dst_width--;
    }
    emms();
}
#endif /* HAVE_MMX */

/* slow version to handle limit cases. Does not need optimization */
static void h_resample_slow(uint8_t *dst, int dst_width,
                            const uint8_t *src, int src_width,
                            int src_start, int src_incr, int16_t *filters)
{
    int src_pos, phase, sum, j, v, i;
    const uint8_t *s, *src_end;
    int16_t *filter;

    src_end = src + src_width;
    src_pos = src_start;
    for(i=0;i<dst_width;i++) {
        s = src + (src_pos >> POS_FRAC_BITS);
        phase = get_phase(src_pos);
        filter = filters + phase * NB_TAPS;
        sum = 0;
        for(j=0;j<NB_TAPS;j++) {
            if (s < src)
                v = src[0];
            else if (s >= src_end)
                v = src_end[-1];
            else
                v = s[0];
            sum += v * filter[j];
            s++;
        }
        sum = sum >> FILTER_BITS;
        if (sum < 0)
            sum = 0;
        else if (sum > 255)
            sum = 255;
        dst[0] = sum;
        src_pos += src_incr;
        dst++;
    }
}

static void h_resample(uint8_t *dst, int dst_width, const uint8_t *src,
                       int src_width, int src_start, int src_incr,
                       int16_t *filters)
{
    int n, src_end;

    if (src_start < 0) {
        n = (0 - src_start + src_incr - 1) / src_incr;
        h_resample_slow(dst, n, src, src_width, src_start, src_incr, filters);
        dst += n;
        dst_width -= n;
        src_start += n * src_incr;
    }
    src_end = src_start + dst_width * src_incr;
    if (src_end > ((src_width - NB_TAPS) << POS_FRAC_BITS)) {
        n = (((src_width - NB_TAPS + 1) << POS_FRAC_BITS) - 1 - src_start) /
            src_incr;
    } else {
        n = dst_width;
    }
#ifdef HAVE_MMX
    if ((mm_flags & MM_MMX) && NB_TAPS == 4)
        h_resample_fast4_mmx(dst, n,
                             src, src_width, src_start, src_incr, filters);
    else
#endif
        h_resample_fast(dst, n,
                        src, src_width, src_start, src_incr, filters);
    if (n < dst_width) {
        dst += n;
        dst_width -= n;
        src_start += n * src_incr;
        h_resample_slow(dst, dst_width,
                        src, src_width, src_start, src_incr, filters);
    }
}

static void component_resample(ImgReSampleContext *s,
                               uint8_t *output, int owrap, int owidth, int oheight,
                               uint8_t *input, int iwrap, int iwidth, int iheight)
{
    int src_y, src_y1, last_src_y, ring_y, phase_y, y1, y;
    uint8_t *new_line, *src_line;

    last_src_y = - FCENTER - 1;
    /* position of the bottom of the filter in the source image */
    src_y = (last_src_y + NB_TAPS) * POS_FRAC;
    ring_y = NB_TAPS; /* position in ring buffer */
    for(y=0;y<oheight;y++) {
        /* apply horizontal filter on new lines from input if needed */
        src_y1 = src_y >> POS_FRAC_BITS;
        while (last_src_y < src_y1) {
            if (++ring_y >= LINE_BUF_HEIGHT + NB_TAPS)
                ring_y = NB_TAPS;
            last_src_y++;
            /* handle limit conditions : replicate line (slightly
               inefficient because we filter multiple times) */
            y1 = last_src_y;
            if (y1 < 0) {
                y1 = 0;
            } else if (y1 >= iheight) {
                y1 = iheight - 1;
            }
            src_line = input + y1 * iwrap;
            new_line = s->line_buf + ring_y * owidth;
            /* apply filter and handle limit cases correctly */
            h_resample(new_line, owidth,
                       src_line, iwidth, - FCENTER * POS_FRAC, s->h_incr,
                       &s->h_filters[0][0]);
            /* handle ring buffer wrapping */
            if (ring_y >= LINE_BUF_HEIGHT) {
                memcpy(s->line_buf + (ring_y - LINE_BUF_HEIGHT) * owidth,
                       new_line, owidth);
            }
        }
        /* apply vertical filter */
        phase_y = get_phase(src_y);
#ifdef HAVE_MMX
        /* desactivated MMX because loss of precision */
        if ((mm_flags & MM_MMX) && NB_TAPS == 4 && 0)
            v_resample4_mmx(output, owidth,
                            s->line_buf + (ring_y - NB_TAPS + 1) * owidth, owidth,
                            &s->v_filters[phase_y][0]);
        else
#endif
#ifdef HAVE_ALTIVEC
            if ((mm_flags & MM_ALTIVEC) && NB_TAPS == 4 && FILTER_BITS <= 6)
                v_resample16_altivec(output, owidth,
                                s->line_buf + (ring_y - NB_TAPS + 1) * owidth, owidth,
                                &s->v_filters[phase_y][0]);
        else
#endif
            v_resample(output, owidth,
                       s->line_buf + (ring_y - NB_TAPS + 1) * owidth, owidth,
                       &s->v_filters[phase_y][0]);

        src_y += s->v_incr;

        output += owrap;
    }
}

ImgReSampleContext *img_resample_init(int owidth, int oheight,
                                      int iwidth, int iheight)
{
    return img_resample_full_init(owidth, oheight, iwidth, iheight,
            0, 0, 0, 0, 0, 0, 0, 0);
}

ImgReSampleContext *img_resample_full_init(int owidth, int oheight,
                                      int iwidth, int iheight,
                                      int topBand, int bottomBand,
        int leftBand, int rightBand,
        int padtop, int padbottom,
        int padleft, int padright)
{
    ImgReSampleContext *s;

    if (!owidth || !oheight || !iwidth || !iheight)
        return NULL;

    s = av_mallocz(sizeof(ImgReSampleContext));
    if (!s)
        return NULL;
    if((unsigned)owidth >= UINT_MAX / (LINE_BUF_HEIGHT + NB_TAPS))
        return NULL;
    s->line_buf = av_mallocz(owidth * (LINE_BUF_HEIGHT + NB_TAPS));
    if (!s->line_buf)
        goto fail;

    s->owidth = owidth;
    s->oheight = oheight;
    s->iwidth = iwidth;
    s->iheight = iheight;

    s->topBand = topBand;
    s->bottomBand = bottomBand;
    s->leftBand = leftBand;
    s->rightBand = rightBand;

    s->padtop = padtop;
    s->padbottom = padbottom;
    s->padleft = padleft;
    s->padright = padright;

    s->pad_owidth = owidth - (padleft + padright);
    s->pad_oheight = oheight - (padtop + padbottom);

    s->h_incr = ((iwidth - leftBand - rightBand) * POS_FRAC) / s->pad_owidth;
    s->v_incr = ((iheight - topBand - bottomBand) * POS_FRAC) / s->pad_oheight;

    av_build_filter(&s->h_filters[0][0], (float) s->pad_owidth  /
            (float) (iwidth - leftBand - rightBand), NB_TAPS, NB_PHASES, 1<<FILTER_BITS, 0);
    av_build_filter(&s->v_filters[0][0], (float) s->pad_oheight /
            (float) (iheight - topBand - bottomBand), NB_TAPS, NB_PHASES, 1<<FILTER_BITS, 0);

    return s;
fail:
    av_free(s);
    return NULL;
}

void img_resample(ImgReSampleContext *s,
                  AVPicture *output, const AVPicture *input)
{
    int i, shift;
    uint8_t* optr;

    for (i=0;i<3;i++) {
        shift = (i == 0) ? 0 : 1;

        optr = output->data[i] + (((output->linesize[i] *
                        s->padtop) + s->padleft) >> shift);

        component_resample(s, optr, output->linesize[i],
                s->pad_owidth >> shift, s->pad_oheight >> shift,
                input->data[i] + (input->linesize[i] *
                    (s->topBand >> shift)) + (s->leftBand >> shift),
                input->linesize[i], ((s->iwidth - s->leftBand -
                        s->rightBand) >> shift),
                           (s->iheight - s->topBand - s->bottomBand) >> shift);
    }
}

void img_resample_close(ImgReSampleContext *s)
{
    av_free(s->line_buf);
    av_free(s);
}

static const AVClass context_class = { "imgresample", NULL, NULL };

struct SwsContext *sws_getContext(int srcW, int srcH, int srcFormat,
                                  int dstW, int dstH, int dstFormat,
                                  int flags, SwsFilter *srcFilter,
                                  SwsFilter *dstFilter, double *param)
{
    struct SwsContext *ctx;

    ctx = av_malloc(sizeof(struct SwsContext));
    if (!ctx) {
        av_log(NULL, AV_LOG_ERROR, "Cannot allocate a resampling context!\n");

        return NULL;
    }
    ctx->av_class = &context_class;

    if ((srcH != dstH) || (srcW != dstW)) {
        if ((srcFormat != PIX_FMT_YUV420P) || (dstFormat != PIX_FMT_YUV420P)) {
            av_log(NULL, AV_LOG_INFO, "PIX_FMT_YUV420P will be used as an intermediate format for rescaling\n");
        }
        ctx->resampling_ctx = img_resample_init(dstW, dstH, srcW, srcH);
    } else {
        ctx->resampling_ctx = av_malloc(sizeof(ImgReSampleContext));
        ctx->resampling_ctx->iheight = srcH;
        ctx->resampling_ctx->iwidth = srcW;
        ctx->resampling_ctx->oheight = dstH;
        ctx->resampling_ctx->owidth = dstW;
    }
    ctx->src_pix_fmt = srcFormat;
    ctx->dst_pix_fmt = dstFormat;

    return ctx;
}

void sws_freeContext(struct SwsContext *ctx)
{
    if (!ctx)
        return;
    if ((ctx->resampling_ctx->iwidth != ctx->resampling_ctx->owidth) ||
        (ctx->resampling_ctx->iheight != ctx->resampling_ctx->oheight)) {
        img_resample_close(ctx->resampling_ctx);
    } else {
        av_free(ctx->resampling_ctx);
    }
    av_free(ctx);
}


/**
 * Checks if context is valid or reallocs a new one instead.
 * If context is NULL, just calls sws_getContext() to get a new one.
 * Otherwise, checks if the parameters are the same already saved in context.
 * If that is the case, returns the current context.
 * Otherwise, frees context and gets a new one.
 *
 * Be warned that srcFilter, dstFilter are not checked, they are
 * asumed to remain valid.
 */
struct SwsContext *sws_getCachedContext(struct SwsContext *ctx,
                        int srcW, int srcH, int srcFormat,
                        int dstW, int dstH, int dstFormat, int flags,
                        SwsFilter *srcFilter, SwsFilter *dstFilter, double *param)
{
    if (ctx != NULL) {
        if ((ctx->resampling_ctx->iwidth != srcW) ||
                        (ctx->resampling_ctx->iheight != srcH) ||
                        (ctx->src_pix_fmt != srcFormat) ||
                        (ctx->resampling_ctx->owidth != dstW) ||
                        (ctx->resampling_ctx->oheight != dstH) ||
                        (ctx->dst_pix_fmt != dstFormat))
        {
            sws_freeContext(ctx);
            ctx = NULL;
        }
    }
    if (ctx == NULL) {
        return sws_getContext(srcW, srcH, srcFormat,
                        dstW, dstH, dstFormat, flags,
                        srcFilter, dstFilter, param);
    }
    return ctx;
}

int sws_scale(struct SwsContext *ctx, uint8_t* src[], int srcStride[],
              int srcSliceY, int srcSliceH, uint8_t* dst[], int dstStride[])
{
    AVPicture src_pict, dst_pict;
    int i, res = 0;
    AVPicture picture_format_temp;
    AVPicture picture_resample_temp, *formatted_picture, *resampled_picture;
    uint8_t *buf1 = NULL, *buf2 = NULL;
    enum PixelFormat current_pix_fmt;

    for (i = 0; i < 4; i++) {
        src_pict.data[i] = src[i];
        src_pict.linesize[i] = srcStride[i];
        dst_pict.data[i] = dst[i];
        dst_pict.linesize[i] = dstStride[i];
    }
    if ((ctx->resampling_ctx->iwidth != ctx->resampling_ctx->owidth) ||
        (ctx->resampling_ctx->iheight != ctx->resampling_ctx->oheight)) {
        /* We have to rescale the picture, but only YUV420P rescaling is supported... */

        if (ctx->src_pix_fmt != PIX_FMT_YUV420P) {
            int size;

            /* create temporary picture for rescaling input*/
            size = avpicture_get_size(PIX_FMT_YUV420P, ctx->resampling_ctx->iwidth, ctx->resampling_ctx->iheight);
            buf1 = av_malloc(size);
            if (!buf1) {
                res = -1;
                goto the_end;
            }
            formatted_picture = &picture_format_temp;
            avpicture_fill((AVPicture*)formatted_picture, buf1,
                           PIX_FMT_YUV420P, ctx->resampling_ctx->iwidth, ctx->resampling_ctx->iheight);

            if (img_convert((AVPicture*)formatted_picture, PIX_FMT_YUV420P,
                            &src_pict, ctx->src_pix_fmt,
                            ctx->resampling_ctx->iwidth, ctx->resampling_ctx->iheight) < 0) {

                av_log(NULL, AV_LOG_ERROR, "pixel format conversion not handled\n");
                res = -1;
                goto the_end;
            }
        } else {
            formatted_picture = &src_pict;
        }

        if (ctx->dst_pix_fmt != PIX_FMT_YUV420P) {
            int size;

            /* create temporary picture for rescaling output*/
            size = avpicture_get_size(PIX_FMT_YUV420P, ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight);
            buf2 = av_malloc(size);
            if (!buf2) {
                res = -1;
                goto the_end;
            }
            resampled_picture = &picture_resample_temp;
            avpicture_fill((AVPicture*)resampled_picture, buf2,
                           PIX_FMT_YUV420P, ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight);

        } else {
            resampled_picture = &dst_pict;
        }

        /* ...and finally rescale!!! */
        img_resample(ctx->resampling_ctx, resampled_picture, formatted_picture);
        current_pix_fmt = PIX_FMT_YUV420P;
    } else {
        resampled_picture = &src_pict;
        current_pix_fmt = ctx->src_pix_fmt;
    }

    if (current_pix_fmt != ctx->dst_pix_fmt) {
        if (img_convert(&dst_pict, ctx->dst_pix_fmt,
                        resampled_picture, current_pix_fmt,
                        ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight) < 0) {

            av_log(NULL, AV_LOG_ERROR, "pixel format conversion not handled\n");

            res = -1;
            goto the_end;
        }
    } else if (resampled_picture != &dst_pict) {
        av_picture_copy(&dst_pict, resampled_picture, current_pix_fmt,
                        ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight);
    }

the_end:
    av_free(buf1);
    av_free(buf2);
    return res;
}


#ifdef TEST
#include <stdio.h>
#undef exit

/* input */
#define XSIZE 256
#define YSIZE 256
uint8_t img[XSIZE * YSIZE];

/* output */
#define XSIZE1 512
#define YSIZE1 512
uint8_t img1[XSIZE1 * YSIZE1];
uint8_t img2[XSIZE1 * YSIZE1];

void save_pgm(const char *filename, uint8_t *img, int xsize, int ysize)
{
#undef fprintf
    FILE *f;
    f=fopen(filename,"w");
    fprintf(f,"P5\n%d %d\n%d\n", xsize, ysize, 255);
    fwrite(img,1, xsize * ysize,f);
    fclose(f);
#define fprintf please_use_av_log
}

static void dump_filter(int16_t *filter)
{
    int i, ph;

    for(ph=0;ph<NB_PHASES;ph++) {
        av_log(NULL, AV_LOG_INFO, "%2d: ", ph);
        for(i=0;i<NB_TAPS;i++) {
            av_log(NULL, AV_LOG_INFO, " %5.2f", filter[ph * NB_TAPS + i] / 256.0);
        }
        av_log(NULL, AV_LOG_INFO, "\n");
    }
}

#ifdef HAVE_MMX
int mm_flags;
#endif

int main(int argc, char **argv)
{
    int x, y, v, i, xsize, ysize;
    ImgReSampleContext *s;
    float fact, factors[] = { 1/2.0, 3.0/4.0, 1.0, 4.0/3.0, 16.0/9.0, 2.0 };
    char buf[256];

    /* build test image */
    for(y=0;y<YSIZE;y++) {
        for(x=0;x<XSIZE;x++) {
            if (x < XSIZE/2 && y < YSIZE/2) {
                if (x < XSIZE/4 && y < YSIZE/4) {
                    if ((x % 10) <= 6 &&
                        (y % 10) <= 6)
                        v = 0xff;
                    else
                        v = 0x00;
                } else if (x < XSIZE/4) {
                    if (x & 1)
                        v = 0xff;
                    else
                        v = 0;
                } else if (y < XSIZE/4) {
                    if (y & 1)
                        v = 0xff;
                    else
                        v = 0;
                } else {
                    if (y < YSIZE*3/8) {
                        if ((y+x) & 1)
                            v = 0xff;
                        else
                            v = 0;
                    } else {
                        if (((x+3) % 4) <= 1 &&
                            ((y+3) % 4) <= 1)
                            v = 0xff;
                        else
                            v = 0x00;
                    }
                }
            } else if (x < XSIZE/2) {
                v = ((x - (XSIZE/2)) * 255) / (XSIZE/2);
            } else if (y < XSIZE/2) {
                v = ((y - (XSIZE/2)) * 255) / (XSIZE/2);
            } else {
                v = ((x + y - XSIZE) * 255) / XSIZE;
            }
            img[(YSIZE - y) * XSIZE + (XSIZE - x)] = v;
        }
    }
    save_pgm("/tmp/in.pgm", img, XSIZE, YSIZE);
    for(i=0;i<sizeof(factors)/sizeof(float);i++) {
        fact = factors[i];
        xsize = (int)(XSIZE * fact);
        ysize = (int)((YSIZE - 100) * fact);
        s = img_resample_full_init(xsize, ysize, XSIZE, YSIZE, 50 ,50, 0, 0, 0, 0, 0, 0);
        av_log(NULL, AV_LOG_INFO, "Factor=%0.2f\n", fact);
        dump_filter(&s->h_filters[0][0]);
        component_resample(s, img1, xsize, xsize, ysize,
                           img + 50 * XSIZE, XSIZE, XSIZE, YSIZE - 100);
        img_resample_close(s);

        snprintf(buf, sizeof(buf), "/tmp/out%d.pgm", i);
        save_pgm(buf, img1, xsize, ysize);
    }

    /* mmx test */
#ifdef HAVE_MMX
    av_log(NULL, AV_LOG_INFO, "MMX test\n");
    fact = 0.72;
    xsize = (int)(XSIZE * fact);
    ysize = (int)(YSIZE * fact);
    mm_flags = MM_MMX;
    s = img_resample_init(xsize, ysize, XSIZE, YSIZE);
    component_resample(s, img1, xsize, xsize, ysize,
                       img, XSIZE, XSIZE, YSIZE);

    mm_flags = 0;
    s = img_resample_init(xsize, ysize, XSIZE, YSIZE);
    component_resample(s, img2, xsize, xsize, ysize,
                       img, XSIZE, XSIZE, YSIZE);
    if (memcmp(img1, img2, xsize * ysize) != 0) {
        av_log(NULL, AV_LOG_ERROR, "mmx error\n");
        exit(1);
    }
    av_log(NULL, AV_LOG_INFO, "MMX OK\n");
#endif /* HAVE_MMX */
    return 0;
}

#endif /* TEST */
OpenPOWER on IntegriCloud