2 * Copyright (c) 2012 Konstantin Shishkov
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * Common functions for Microsoft Screen 1 and 2
26 #include "libavutil/intfloat.h"
27 #include "libavutil/intreadwrite.h"
37 static const int sec_order_sizes[4] = { 1, 7, 6, 1 };
39 enum ContextDirection {
46 static int model_calc_threshold(Model *m)
50 thr = 2 * m->weights[m->num_syms] - 1;
51 thr = ((thr >> 1) + 4 * m->cum_prob[0]) / thr;
53 return FFMIN(thr, 0x3FFF);
56 static void model_reset(Model *m)
60 for (i = 0; i <= m->num_syms; i++) {
62 m->cum_prob[i] = m->num_syms - i;
65 for (i = 0; i < m->num_syms; i++)
66 m->idx2sym[i + 1] = i;
69 static av_cold void model_init(Model *m, int num_syms, int thr_weight)
71 m->num_syms = num_syms;
72 m->thr_weight = thr_weight;
73 m->threshold = num_syms * thr_weight;
76 static void model_rescale_weights(Model *m)
81 if (m->thr_weight == THRESH_ADAPTIVE)
82 m->threshold = model_calc_threshold(m);
83 while (m->cum_prob[0] > m->threshold) {
85 for (i = m->num_syms; i >= 0; i--) {
86 m->cum_prob[i] = cum_prob;
87 m->weights[i] = (m->weights[i] + 1) >> 1;
88 cum_prob += m->weights[i];
93 void ff_mss12_model_update(Model *m, int val)
97 if (m->weights[val] == m->weights[val - 1]) {
98 for (i = val; m->weights[i - 1] == m->weights[val]; i--);
102 sym1 = m->idx2sym[val];
103 sym2 = m->idx2sym[i];
105 m->idx2sym[val] = sym2;
106 m->idx2sym[i] = sym1;
112 for (i = val - 1; i >= 0; i--)
114 model_rescale_weights(m);
117 static void pixctx_reset(PixContext *ctx)
121 if (!ctx->special_initial_cache)
122 for (i = 0; i < ctx->cache_size; i++)
130 model_reset(&ctx->cache_model);
131 model_reset(&ctx->full_model);
133 for (i = 0; i < 15; i++)
134 for (j = 0; j < 4; j++)
135 model_reset(&ctx->sec_models[i][j]);
138 static av_cold void pixctx_init(PixContext *ctx, int cache_size,
139 int full_model_syms, int special_initial_cache)
143 ctx->cache_size = cache_size + 4;
144 ctx->num_syms = cache_size;
145 ctx->special_initial_cache = special_initial_cache;
147 model_init(&ctx->cache_model, ctx->num_syms + 1, THRESH_LOW);
148 model_init(&ctx->full_model, full_model_syms, THRESH_HIGH);
150 for (i = 0, idx = 0; i < 4; i++)
151 for (j = 0; j < sec_order_sizes[i]; j++, idx++)
152 for (k = 0; k < 4; k++)
153 model_init(&ctx->sec_models[idx][k], 2 + i,
154 i ? THRESH_LOW : THRESH_ADAPTIVE);
157 static av_always_inline int decode_pixel(ArithCoder *acoder, PixContext *pctx,
158 uint8_t *ngb, int num_ngb, int any_ngb)
162 val = acoder->get_model_sym(acoder, &pctx->cache_model);
163 if (val < pctx->num_syms) {
168 for (i = 0; i < pctx->cache_size; i++) {
169 for (j = 0; j < num_ngb; j++)
170 if (pctx->cache[i] == ngb[j])
178 val = FFMIN(i, pctx->cache_size - 1);
180 pix = pctx->cache[val];
182 pix = acoder->get_model_sym(acoder, &pctx->full_model);
183 for (i = 0; i < pctx->cache_size - 1; i++)
184 if (pctx->cache[i] == pix)
189 for (i = val; i > 0; i--)
190 pctx->cache[i] = pctx->cache[i - 1];
191 pctx->cache[0] = pix;
197 static int decode_pixel_in_context(ArithCoder *acoder, PixContext *pctx,
198 uint8_t *src, int stride, int x, int y,
201 uint8_t neighbours[4];
209 memset(neighbours, src[-1], 4);
211 neighbours[TOP] = src[-stride];
213 neighbours[TOP_LEFT] = neighbours[LEFT] = neighbours[TOP];
215 neighbours[TOP_LEFT] = src[-stride - 1];
216 neighbours[ LEFT] = src[-1];
219 neighbours[TOP_RIGHT] = src[-stride + 1];
221 neighbours[TOP_RIGHT] = neighbours[TOP];
225 if (x >= 2 && src[-2] == neighbours[LEFT])
227 if (y >= 2 && src[-2 * stride] == neighbours[TOP])
231 ref_pix[0] = neighbours[0];
232 for (i = 1; i < 4; i++) {
233 for (j = 0; j < nlen; j++)
234 if (ref_pix[j] == neighbours[i])
237 ref_pix[nlen++] = neighbours[i];
245 if (neighbours[TOP] == neighbours[TOP_LEFT]) {
246 if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT])
248 else if (neighbours[LEFT] == neighbours[TOP_LEFT])
252 } else if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT]) {
253 if (neighbours[LEFT] == neighbours[TOP_LEFT])
257 } else if (neighbours[LEFT] == neighbours[TOP_LEFT]) {
264 if (neighbours[TOP] == neighbours[TOP_LEFT])
266 else if (neighbours[TOP_RIGHT] == neighbours[TOP_LEFT])
268 else if (neighbours[LEFT] == neighbours[TOP_LEFT])
270 else if (neighbours[TOP_RIGHT] == neighbours[TOP])
272 else if (neighbours[TOP] == neighbours[LEFT])
282 pix = acoder->get_model_sym(acoder,
283 &pctx->sec_models[layer][sub]);
287 return decode_pixel(acoder, pctx, ref_pix, nlen, 1);
290 static int decode_region(ArithCoder *acoder, uint8_t *dst, uint8_t *rgb_pic,
291 int x, int y, int width, int height, int stride,
292 int rgb_stride, PixContext *pctx, const uint32_t *pal)
295 uint8_t *rgb_dst = rgb_pic + x * 3 + y * rgb_stride;
297 dst += x + y * stride;
299 for (j = 0; j < height; j++) {
300 for (i = 0; i < width; i++) {
302 p = decode_pixel(acoder, pctx, NULL, 0, 0);
304 p = decode_pixel_in_context(acoder, pctx, dst + i, stride,
305 i, j, width - i - 1);
309 AV_WB24(rgb_dst + i * 3, pal[p]);
312 rgb_dst += rgb_stride;
318 static void copy_rectangles(MSS12Context const *c,
319 int x, int y, int width, int height)
324 for (j = y; j < y + height; j++) {
325 memcpy(c->rgb_pic + j * c->rgb_stride + x * 3,
326 c->last_rgb_pic + j * c->rgb_stride + x * 3,
328 memcpy(c->pal_pic + j * c->pal_stride + x,
329 c->last_pal_pic + j * c->pal_stride + x,
334 static int motion_compensation(MSS12Context const *c,
335 int x, int y, int width, int height)
337 if (x + c->mvX < 0 || x + c->mvX + width > c->avctx->width ||
338 y + c->mvY < 0 || y + c->mvY + height > c->avctx->height ||
342 uint8_t *dst = c->pal_pic + x + y * c->pal_stride;
343 uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * c->rgb_stride;
349 if (c->last_rgb_pic) {
350 src = c->last_pal_pic + x + y * c->pal_stride;
351 rgb_src = c->last_rgb_pic + x * 3 + y * c->rgb_stride;
353 src = c->pal_pic + x + y * c->pal_stride;
354 rgb_src = c->rgb_pic + x * 3 + y * c->rgb_stride;
356 for (j = 0; j < height; j++) {
357 memmove(dst, src, width);
358 memmove(rgb_dst, rgb_src, width * 3);
359 dst += c->pal_stride;
360 src += c->pal_stride;
361 rgb_dst += c->rgb_stride;
362 rgb_src += c->rgb_stride;
368 static int decode_region_masked(MSS12Context const *c, ArithCoder *acoder,
369 uint8_t *dst, int stride, uint8_t *mask,
370 int mask_stride, int x, int y,
371 int width, int height,
375 uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * c->rgb_stride;
377 dst += x + y * stride;
378 mask += x + y * mask_stride;
380 for (j = 0; j < height; j++) {
381 for (i = 0; i < width; i++) {
382 if (c->avctx->err_recognition & AV_EF_EXPLODE &&
383 ( c->rgb_pic && mask[i] != 0x01 && mask[i] != 0x02 && mask[i] != 0x04 ||
384 !c->rgb_pic && mask[i] != 0x80 && mask[i] != 0xFF))
387 if (mask[i] == 0x02) {
388 copy_rectangles(c, x + i, y + j, 1, 1);
389 } else if (mask[i] == 0x04) {
390 if (motion_compensation(c, x + i, y + j, 1, 1))
392 } else if (mask[i] != 0x80) {
394 p = decode_pixel(acoder, pctx, NULL, 0, 0);
396 p = decode_pixel_in_context(acoder, pctx, dst + i, stride,
397 i, j, width - i - 1);
400 AV_WB24(rgb_dst + i * 3, c->pal[p]);
405 rgb_dst += c->rgb_stride;
411 static av_cold void slicecontext_init(SliceContext *sc,
412 int version, int full_model_syms)
414 model_init(&sc->intra_region, 2, THRESH_ADAPTIVE);
415 model_init(&sc->inter_region, 2, THRESH_ADAPTIVE);
416 model_init(&sc->split_mode, 3, THRESH_HIGH);
417 model_init(&sc->edge_mode, 2, THRESH_HIGH);
418 model_init(&sc->pivot, 3, THRESH_LOW);
420 pixctx_init(&sc->intra_pix_ctx, 8, full_model_syms, 0);
422 pixctx_init(&sc->inter_pix_ctx, version ? 3 : 2,
423 full_model_syms, version ? 1 : 0);
426 void ff_mss12_slicecontext_reset(SliceContext *sc)
428 model_reset(&sc->intra_region);
429 model_reset(&sc->inter_region);
430 model_reset(&sc->split_mode);
431 model_reset(&sc->edge_mode);
432 model_reset(&sc->pivot);
433 pixctx_reset(&sc->intra_pix_ctx);
434 pixctx_reset(&sc->inter_pix_ctx);
437 static int decode_pivot(SliceContext *sc, ArithCoder *acoder, int base)
441 inv = acoder->get_model_sym(acoder, &sc->edge_mode);
442 val = acoder->get_model_sym(acoder, &sc->pivot) + 1;
445 if ((base + 1) / 2 - 2 <= 0)
448 val = acoder->get_number(acoder, (base + 1) / 2 - 2) + 3;
451 if ((unsigned)val >= base)
454 return inv ? base - val : val;
457 static int decode_region_intra(SliceContext *sc, ArithCoder *acoder,
458 int x, int y, int width, int height)
460 MSS12Context const *c = sc->c;
463 mode = acoder->get_model_sym(acoder, &sc->intra_region);
466 int i, j, pix, rgb_pix;
467 int stride = c->pal_stride;
468 int rgb_stride = c->rgb_stride;
469 uint8_t *dst = c->pal_pic + x + y * stride;
470 uint8_t *rgb_dst = c->rgb_pic + x * 3 + y * rgb_stride;
472 pix = decode_pixel(acoder, &sc->intra_pix_ctx, NULL, 0, 0);
473 rgb_pix = c->pal[pix];
474 for (i = 0; i < height; i++, dst += stride, rgb_dst += rgb_stride) {
475 memset(dst, pix, width);
477 for (j = 0; j < width * 3; j += 3)
478 AV_WB24(rgb_dst + j, rgb_pix);
481 return decode_region(acoder, c->pal_pic, c->rgb_pic,
482 x, y, width, height, c->pal_stride, c->rgb_stride,
483 &sc->intra_pix_ctx, &c->pal[0]);
489 static int decode_region_inter(SliceContext *sc, ArithCoder *acoder,
490 int x, int y, int width, int height)
492 MSS12Context const *c = sc->c;
495 mode = acoder->get_model_sym(acoder, &sc->inter_region);
498 mode = decode_pixel(acoder, &sc->inter_pix_ctx, NULL, 0, 0);
500 if (c->avctx->err_recognition & AV_EF_EXPLODE &&
501 ( c->rgb_pic && mode != 0x01 && mode != 0x02 && mode != 0x04 ||
502 !c->rgb_pic && mode != 0x80 && mode != 0xFF))
506 copy_rectangles(c, x, y, width, height);
507 else if (mode == 0x04)
508 return motion_compensation(c, x, y, width, height);
509 else if (mode != 0x80)
510 return decode_region_intra(sc, acoder, x, y, width, height);
512 if (decode_region(acoder, c->mask, NULL,
513 x, y, width, height, c->mask_stride, 0,
514 &sc->inter_pix_ctx, &c->pal[0]) < 0)
516 return decode_region_masked(c, acoder, c->pal_pic,
517 c->pal_stride, c->mask,
526 int ff_mss12_decode_rect(SliceContext *sc, ArithCoder *acoder,
527 int x, int y, int width, int height)
531 mode = acoder->get_model_sym(acoder, &sc->split_mode);
535 if ((pivot = decode_pivot(sc, acoder, height)) < 1)
537 if (ff_mss12_decode_rect(sc, acoder, x, y, width, pivot))
539 if (ff_mss12_decode_rect(sc, acoder, x, y + pivot, width, height - pivot))
543 if ((pivot = decode_pivot(sc, acoder, width)) < 1)
545 if (ff_mss12_decode_rect(sc, acoder, x, y, pivot, height))
547 if (ff_mss12_decode_rect(sc, acoder, x + pivot, y, width - pivot, height))
552 return decode_region_intra(sc, acoder, x, y, width, height);
554 return decode_region_inter(sc, acoder, x, y, width, height);
562 av_cold int ff_mss12_decode_init(MSS12Context *c, int version,
563 SliceContext* sc1, SliceContext *sc2)
565 AVCodecContext *avctx = c->avctx;
568 if (avctx->extradata_size < 52 + 256 * 3) {
569 av_log(avctx, AV_LOG_ERROR, "Insufficient extradata size %d\n",
570 avctx->extradata_size);
571 return AVERROR_INVALIDDATA;
574 if (AV_RB32(avctx->extradata) < avctx->extradata_size) {
575 av_log(avctx, AV_LOG_ERROR,
576 "Insufficient extradata size: expected %d got %d\n",
577 AV_RB32(avctx->extradata),
578 avctx->extradata_size);
579 return AVERROR_INVALIDDATA;
582 avctx->coded_width = AV_RB32(avctx->extradata + 20);
583 avctx->coded_height = AV_RB32(avctx->extradata + 24);
584 if (avctx->coded_width > 4096 || avctx->coded_height > 4096) {
585 av_log(avctx, AV_LOG_ERROR, "Frame dimensions %dx%d too large",
586 avctx->coded_width, avctx->coded_height);
587 return AVERROR_INVALIDDATA;
590 av_log(avctx, AV_LOG_DEBUG, "Encoder version %d.%d\n",
591 AV_RB32(avctx->extradata + 4), AV_RB32(avctx->extradata + 8));
592 if (version != AV_RB32(avctx->extradata + 4) > 1) {
593 av_log(avctx, AV_LOG_ERROR,
594 "Header version doesn't match codec tag\n");
598 c->free_colours = AV_RB32(avctx->extradata + 48);
599 if ((unsigned)c->free_colours > 256) {
600 av_log(avctx, AV_LOG_ERROR,
601 "Incorrect number of changeable palette entries: %d\n",
603 return AVERROR_INVALIDDATA;
605 av_log(avctx, AV_LOG_DEBUG, "%d free colour(s)\n", c->free_colours);
607 av_log(avctx, AV_LOG_DEBUG, "Display dimensions %dx%d\n",
608 AV_RB32(avctx->extradata + 12), AV_RB32(avctx->extradata + 16));
609 av_log(avctx, AV_LOG_DEBUG, "Coded dimensions %dx%d\n",
610 avctx->coded_width, avctx->coded_height);
611 av_log(avctx, AV_LOG_DEBUG, "%g frames per second\n",
612 av_int2float(AV_RB32(avctx->extradata + 28)));
613 av_log(avctx, AV_LOG_DEBUG, "Bitrate %d bps\n",
614 AV_RB32(avctx->extradata + 32));
615 av_log(avctx, AV_LOG_DEBUG, "Max. lead time %g ms\n",
616 av_int2float(AV_RB32(avctx->extradata + 36)));
617 av_log(avctx, AV_LOG_DEBUG, "Max. lag time %g ms\n",
618 av_int2float(AV_RB32(avctx->extradata + 40)));
619 av_log(avctx, AV_LOG_DEBUG, "Max. seek time %g ms\n",
620 av_int2float(AV_RB32(avctx->extradata + 44)));
623 if (avctx->extradata_size < 60 + 256 * 3) {
624 av_log(avctx, AV_LOG_ERROR,
625 "Insufficient extradata size %d for v2\n",
626 avctx->extradata_size);
627 return AVERROR_INVALIDDATA;
630 c->slice_split = AV_RB32(avctx->extradata + 52);
631 av_log(avctx, AV_LOG_DEBUG, "Slice split %d\n", c->slice_split);
633 c->full_model_syms = AV_RB32(avctx->extradata + 56);
634 if (c->full_model_syms < 2 || c->full_model_syms > 256) {
635 av_log(avctx, AV_LOG_ERROR,
636 "Incorrect number of used colours %d\n",
638 return AVERROR_INVALIDDATA;
640 av_log(avctx, AV_LOG_DEBUG, "Used colours %d\n",
644 c->full_model_syms = 256;
647 for (i = 0; i < 256; i++)
648 c->pal[i] = 0xFFU << 24 | AV_RB24(avctx->extradata + 52 +
649 (version ? 8 : 0) + i * 3);
651 c->mask_stride = FFALIGN(avctx->width, 16);
652 c->mask = av_malloc(c->mask_stride * avctx->height);
654 av_log(avctx, AV_LOG_ERROR, "Cannot allocate mask plane\n");
655 return AVERROR(ENOMEM);
659 slicecontext_init(sc1, version, c->full_model_syms);
660 if (c->slice_split) {
662 slicecontext_init(sc2, version, c->full_model_syms);
669 av_cold int ff_mss12_decode_end(MSS12Context *c)