MSS2 decoder
[libav.git] / libavcodec / mss2.c
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1/*
2 * Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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.
10 *
11 * Libav 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.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21/**
22 * @file
23 * Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder
24 */
25
26#include "libavutil/avassert.h"
27#include "msmpeg4data.h"
28#include "vc1.h"
29#include "mss12.h"
30#include "mss2dsp.h"
31
32typedef struct MSS2Context {
33 VC1Context v;
34 int split_position;
35 AVFrame pic;
36 AVFrame last_pic;
37 MSS12Context c;
38 MSS2DSPContext dsp;
39 SliceContext sc[2];
40} MSS2Context;
41
42static void arith2_normalise(ArithCoder *c)
43{
44 while ((c->high >> 15) - (c->low >> 15) < 2) {
45 if ((c->low ^ c->high) & 0x10000) {
46 c->high ^= 0x8000;
47 c->value ^= 0x8000;
48 c->low ^= 0x8000;
49 }
50 c->high = c->high << 8 & 0xFFFFFF | 0xFF;
51 c->value = c->value << 8 & 0xFFFFFF | bytestream2_get_byte(c->gbc.gB);
52 c->low = c->low << 8 & 0xFFFFFF;
53 }
54}
55
56ARITH_GET_BIT(2)
57
58/* L. Stuiver and A. Moffat: "Piecewise Integer Mapping for Arithmetic Coding."
59 * In Proc. 8th Data Compression Conference (DCC '98), pp. 3-12, Mar. 1998 */
60
61static int arith2_get_scaled_value(int value, int n, int range)
62{
63 int split = (n << 1) - range;
64
65 if (value > split)
66 return split + (value - split >> 1);
67 else
68 return value;
69}
70
71static void arith2_rescale_interval(ArithCoder *c, int range,
72 int low, int high, int n)
73{
74 int split = (n << 1) - range;
75
76 if (high > split)
77 c->high = split + (high - split << 1);
78 else
79 c->high = high;
80
81 c->high += c->low - 1;
82
83 if (low > split)
84 c->low += split + (low - split << 1);
85 else
86 c->low += low;
87}
88
89static int arith2_get_number(ArithCoder *c, int n)
90{
91 int range = c->high - c->low + 1;
92 int scale = av_log2(range) - av_log2(n);
93 int val;
94
95 if (n << scale > range)
96 scale--;
97
98 n <<= scale;
99
100 val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
101
102 arith2_rescale_interval(c, range, val << scale, (val + 1) << scale, n);
103
104 arith2_normalise(c);
105
106 return val;
107}
108
109static int arith2_get_prob(ArithCoder *c, int *probs)
110{
111 int range = c->high - c->low + 1, n = *probs;
112 int scale = av_log2(range) - av_log2(n);
113 int i = 0, val;
114
115 if (n << scale > range)
116 scale--;
117
118 n <<= scale;
119
120 val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
121 while (probs[++i] > val) ;
122
123 arith2_rescale_interval(c, range,
124 probs[i] << scale, probs[i - 1] << scale, n);
125
126 return i;
127}
128
129ARITH_GET_MODEL_SYM(2)
130
131static int arith2_get_consumed_bytes(ArithCoder *c)
132{
133 int diff = (c->high >> 16) - (c->low >> 16);
134 int bp = bytestream2_tell(c->gbc.gB) - 3 << 3;
135 int bits = 1;
136
137 while (!(diff & 0x80)) {
138 bits++;
139 diff <<= 1;
140 }
141
142 return (bits + bp + 7 >> 3) + ((c->low >> 16) + 1 == c->high >> 16);
143}
144
145static void arith2_init(ArithCoder *c, GetByteContext *gB)
146{
147 c->low = 0;
148 c->high = 0xFFFFFF;
149 c->value = bytestream2_get_be24(gB);
150 c->gbc.gB = gB;
151 c->get_model_sym = arith2_get_model_sym;
152 c->get_number = arith2_get_number;
153}
154
155static int decode_pal_v2(MSS12Context *ctx, const uint8_t *buf, int buf_size)
156{
157 int i, ncol;
158 uint32_t *pal = ctx->pal + 256 - ctx->free_colours;
159
160 if (!ctx->free_colours)
161 return 0;
162
163 ncol = *buf++;
164 if (buf_size < 2 + ncol * 3)
165 return -1;
166 for (i = 0; i < ncol; i++)
167 *pal++ = AV_RB24(buf + 3 * i);
168
169 return 1 + ncol * 3;
170}
171
172static int decode_555(GetByteContext *gB, uint16_t *dst, int stride,
173 int keyframe, int w, int h)
174{
175 int last_symbol = 0, repeat = 0, prev_avail = 0;
176
177 if (!keyframe) {
178 int x, y, endx, endy, t;
179
180#define READ_PAIR(a, b) \
181 a = bytestream2_get_byte(gB) << 4; \
182 t = bytestream2_get_byte(gB); \
183 a |= t >> 4; \
184 b = (t & 0xF) << 8; \
185 b |= bytestream2_get_byte(gB); \
186
187 READ_PAIR(x, endx)
188 READ_PAIR(y, endy)
189
190 if (endx >= w || endy >= h || x > endx || y > endy)
191 return -1;
192 dst += x + stride * y;
193 w = endx - x + 1;
194 h = endy - y + 1;
195 if (y)
196 prev_avail = 1;
197 }
198
199 do {
200 uint16_t *p = dst;
201 do {
202 if (repeat-- < 1) {
203 int b = bytestream2_get_byte(gB);
204 if (b < 128)
205 last_symbol = b << 8 | bytestream2_get_byte(gB);
206 else if (b > 129) {
207 repeat = 0;
208 while (b-- > 130)
209 repeat = (repeat << 8) + bytestream2_get_byte(gB) + 1;
210 if (last_symbol == -2) {
211 int skip = FFMIN((unsigned)repeat, dst + w - p);
212 repeat -= skip;
213 p += skip;
214 }
215 } else
216 last_symbol = 127 - b;
217 }
218 if (last_symbol >= 0)
219 *p = last_symbol;
220 else if (last_symbol == -1 && prev_avail)
221 *p = *(p - stride);
222 } while (++p < dst + w);
223 dst += stride;
224 prev_avail = 1;
225 } while (--h);
226
227 return 0;
228}
229
230static int decode_rle(GetBitContext *gb, uint8_t *pal_dst, int pal_stride,
231 uint8_t *rgb_dst, int rgb_stride, uint32_t *pal,
232 int keyframe, int kf_slipt, int slice, int w, int h)
233{
234 uint8_t bits[270] = { 0 };
235 uint32_t codes[270];
236 VLC vlc;
237
238 int current_length = 0, read_codes = 0, next_code = 0, current_codes = 0;
239 int remaining_codes, surplus_codes, i;
240
241 const int alphabet_size = 270 - keyframe;
242
243 int last_symbol = 0, repeat = 0, prev_avail = 0;
244
245 if (!keyframe) {
246 int x, y, clipw, cliph;
247
248 x = get_bits(gb, 12);
249 y = get_bits(gb, 12);
250 clipw = get_bits(gb, 12) + 1;
251 cliph = get_bits(gb, 12) + 1;
252
253 if (x + clipw > w || y + cliph > h)
254 return AVERROR_INVALIDDATA;
255 pal_dst += pal_stride * y + x;
256 rgb_dst += rgb_stride * y + x * 3;
257 w = clipw;
258 h = cliph;
259 if (y)
260 prev_avail = 1;
261 } else {
262 if (slice > 0) {
263 pal_dst += pal_stride * kf_slipt;
264 rgb_dst += rgb_stride * kf_slipt;
265 prev_avail = 1;
266 h -= kf_slipt;
267 } else
268 h = kf_slipt;
269 }
270
271 /* read explicit codes */
272 do {
273 while (current_codes--) {
274 int symbol = get_bits(gb, 8);
275 if (symbol >= 204 - keyframe)
276 symbol += 14 - keyframe;
277 else if (symbol > 189)
278 symbol = get_bits1(gb) + (symbol << 1) - 190;
279 if (bits[symbol])
280 return AVERROR_INVALIDDATA;
281 bits[symbol] = current_length;
282 codes[symbol] = next_code++;
283 read_codes++;
284 }
285 current_length++;
286 next_code <<= 1;
287 remaining_codes = (1 << current_length) - next_code;
288 current_codes = get_bits(gb, av_ceil_log2(remaining_codes + 1));
289 if (current_length > 22 || current_codes > remaining_codes)
290 return AVERROR_INVALIDDATA;
291 } while (current_codes != remaining_codes);
292
293 remaining_codes = alphabet_size - read_codes;
294
295 /* determine the minimum length to fit the rest of the alphabet */
296 while ((surplus_codes = (2 << current_length) -
297 (next_code << 1) - remaining_codes) < 0) {
298 current_length++;
299 next_code <<= 1;
300 }
301
302 /* add the rest of the symbols lexicographically */
303 for (i = 0; i < alphabet_size; i++)
304 if (!bits[i]) {
305 if (surplus_codes-- == 0) {
306 current_length++;
307 next_code <<= 1;
308 }
309 bits[i] = current_length;
310 codes[i] = next_code++;
311 }
312
313 if (next_code != 1 << current_length)
314 return AVERROR_INVALIDDATA;
315
316 if (i = init_vlc(&vlc, 9, alphabet_size, bits, 1, 1, codes, 4, 4, 0))
317 return i;
318
319 /* frame decode */
320 do {
321 uint8_t *pp = pal_dst;
322 uint8_t *rp = rgb_dst;
323 do {
324 if (repeat-- < 1) {
325 int b = get_vlc2(gb, vlc.table, 9, 3);
326 if (b < 256)
327 last_symbol = b;
328 else if (b < 268) {
329 b -= 256;
330 if (b == 11)
331 b = get_bits(gb, 4) + 10;
332
333 if (!b)
334 repeat = 0;
335 else
336 repeat = get_bits(gb, b);
337
338 while (b--)
339 repeat += 1 << b;
340
341 if (last_symbol == -2) {
342 int skip = FFMIN(repeat, pal_dst + w - pp);
343 repeat -= skip;
344 pp += skip;
345 rp += skip * 3;
346 }
347 } else
348 last_symbol = 267 - b;
349 }
350 if (last_symbol >= 0) {
351 *pp = last_symbol;
352 AV_WB24(rp, pal[last_symbol]);
353 } else if (last_symbol == -1 && prev_avail) {
354 *pp = *(pp - pal_stride);
355 memcpy(rp, rp - rgb_stride, 3);
356 }
357 rp += 3;
358 } while (++pp < pal_dst + w);
359 pal_dst += pal_stride;
360 rgb_dst += rgb_stride;
361 prev_avail = 1;
362 } while (--h);
363
364 ff_free_vlc(&vlc);
365 return 0;
366}
367
368static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size,
369 int x, int y, int w, int h, int wmv9_mask)
370{
371 MSS2Context *ctx = avctx->priv_data;
372 MSS12Context *c = &ctx->c;
373 VC1Context *v = avctx->priv_data;
374 MpegEncContext *s = &v->s;
375 AVFrame *f;
376
377 ff_mpeg_flush(avctx);
378
379 if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
380 int i = ff_find_unused_picture(s, 0);
381 if (i < 0)
382 return -1;
383 s->current_picture_ptr = &s->picture[i];
384 }
385
386 init_get_bits(&s->gb, buf, buf_size * 8);
387
388 s->loop_filter = avctx->skip_loop_filter < AVDISCARD_ALL;
389
390 if (ff_vc1_parse_frame_header(v, &s->gb) == -1) {
391 av_log(v->s.avctx, AV_LOG_ERROR, "header error\n");
392 return AVERROR_INVALIDDATA;
393 }
394
395 if (s->pict_type != AV_PICTURE_TYPE_I) {
396 av_log(v->s.avctx, AV_LOG_ERROR, "expected I-frame\n");
397 return AVERROR_INVALIDDATA;
398 }
399
400 avctx->pix_fmt = PIX_FMT_YUV420P;
401
402 if (ff_MPV_frame_start(s, avctx) < 0) {
403 av_log(v->s.avctx, AV_LOG_ERROR, "ff_MPV_frame_start error\n");
404 avctx->pix_fmt = PIX_FMT_RGB24;
405 return -1;
406 }
407
408 ff_er_frame_start(s);
409
410 v->bits = buf_size * 8;
411
412 v->end_mb_x = (w + 15) >> 4;
413 s->end_mb_y = (h + 15) >> 4;
414 if (v->respic & 1)
415 v->end_mb_x = v->end_mb_x + 1 >> 1;
416 if (v->respic & 2)
417 s->end_mb_y = s->end_mb_y + 1 >> 1;
418
419 ff_vc1_decode_blocks(v);
420
421 ff_er_frame_end(s);
422
423 ff_MPV_frame_end(s);
424
425 f = &s->current_picture.f;
426
427 if (v->respic == 3) {
428 ctx->dsp.upsample_plane(f->data[0], f->linesize[0], w, h);
429 ctx->dsp.upsample_plane(f->data[1], f->linesize[1], w >> 1, h >> 1);
430 ctx->dsp.upsample_plane(f->data[2], f->linesize[2], w >> 1, h >> 1);
431 } else if (v->respic)
432 av_log_ask_for_sample(v->s.avctx,
433 "Asymmetric WMV9 rectangle subsampling\n");
434
435 av_assert0(f->linesize[1] == f->linesize[2]);
436
437 if (wmv9_mask != -1)
438 ctx->dsp.mss2_blit_wmv9_masked(c->rgb_pic + y * c->rgb_stride + x * 3,
439 c->rgb_stride, wmv9_mask,
440 c->pal_pic + y * c->pal_stride + x,
441 c->pal_stride,
442 f->data[0], f->linesize[0],
443 f->data[1], f->data[2], f->linesize[1],
444 w, h);
445 else
446 ctx->dsp.mss2_blit_wmv9(c->rgb_pic + y * c->rgb_stride + x * 3,
447 c->rgb_stride,
448 f->data[0], f->linesize[0],
449 f->data[1], f->data[2], f->linesize[1],
450 w, h);
451
452 avctx->pix_fmt = PIX_FMT_RGB24;
453
454 return 0;
455}
456
457typedef struct Rectangle {
458 int coded, x, y, w, h;
459} Rectangle;
460
461#define MAX_WMV9_RECTANGLES 20
462#define ARITH2_PADDING 2
463
464static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
465 AVPacket *avpkt)
466{
467 const uint8_t *buf = avpkt->data;
468 int buf_size = avpkt->size;
469 MSS2Context *ctx = avctx->priv_data;
470 MSS12Context *c = &ctx->c;
471 GetBitContext gb;
472 GetByteContext gB;
473 ArithCoder acoder;
474
475 int keyframe, has_wmv9, has_mv, is_rle, is_555, ret;
476
477 Rectangle wmv9rects[MAX_WMV9_RECTANGLES], *r;
478 int used_rects = 0, i, implicit_rect, av_uninit(wmv9_mask);
479
480 av_assert0(FF_INPUT_BUFFER_PADDING_SIZE >=
481 ARITH2_PADDING + (MIN_CACHE_BITS + 7) / 8);
482
483 init_get_bits(&gb, buf, buf_size * 8);
484
485 if (keyframe = get_bits1(&gb))
486 skip_bits(&gb, 7);
487 has_wmv9 = get_bits1(&gb);
488 has_mv = keyframe ? 0 : get_bits1(&gb);
489 is_rle = get_bits1(&gb);
490 is_555 = is_rle && get_bits1(&gb);
491 if (c->slice_split > 0)
492 ctx->split_position = c->slice_split;
493 else if (c->slice_split < 0) {
494 if (get_bits1(&gb)) {
495 if (get_bits1(&gb)) {
496 if (get_bits1(&gb))
497 ctx->split_position = get_bits(&gb, 16);
498 else
499 ctx->split_position = get_bits(&gb, 12);
500 } else
501 ctx->split_position = get_bits(&gb, 8) << 4;
502 } else {
503 if (keyframe)
504 ctx->split_position = avctx->height / 2;
505 }
506 } else
507 ctx->split_position = avctx->height;
508
509 if (c->slice_split && (ctx->split_position < 1 - is_555 ||
510 ctx->split_position > avctx->height - 1))
511 return AVERROR_INVALIDDATA;
512
513 align_get_bits(&gb);
514 buf += get_bits_count(&gb) >> 3;
515 buf_size -= get_bits_count(&gb) >> 3;
516
517 if (buf_size < 1)
518 return AVERROR_INVALIDDATA;
519
520 if (is_555 && (has_wmv9 || has_mv || c->slice_split && ctx->split_position))
521 return AVERROR_INVALIDDATA;
522
523 avctx->pix_fmt = is_555 ? PIX_FMT_RGB555 : PIX_FMT_RGB24;
524 if (ctx->pic.data[0] && ctx->pic.format != avctx->pix_fmt)
525 avctx->release_buffer(avctx, &ctx->pic);
526
527 if (has_wmv9) {
528 bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
529 arith2_init(&acoder, &gB);
530
531 implicit_rect = !arith2_get_bit(&acoder);
532
533 while (arith2_get_bit(&acoder)) {
534 if (used_rects == MAX_WMV9_RECTANGLES)
535 return AVERROR_INVALIDDATA;
536 r = &wmv9rects[used_rects];
537 if (!used_rects)
538 r->x = arith2_get_number(&acoder, avctx->width);
539 else
540 r->x = arith2_get_number(&acoder, avctx->width -
541 wmv9rects[used_rects - 1].x) +
542 wmv9rects[used_rects - 1].x;
543 r->y = arith2_get_number(&acoder, avctx->height);
544 r->w = arith2_get_number(&acoder, avctx->width - r->x) + 1;
545 r->h = arith2_get_number(&acoder, avctx->height - r->y) + 1;
546 used_rects++;
547 }
548
549 if (implicit_rect && used_rects) {
550 av_log(avctx, AV_LOG_ERROR, "implicit_rect && used_rects > 0\n");
551 return AVERROR_INVALIDDATA;
552 }
553
554 if (implicit_rect) {
555 wmv9rects[0].x = 0;
556 wmv9rects[0].y = 0;
557 wmv9rects[0].w = avctx->width;
558 wmv9rects[0].h = avctx->height;
559
560 used_rects = 1;
561 }
562 for (i = 0; i < used_rects; i++) {
563 if (!implicit_rect && arith2_get_bit(&acoder)) {
564 av_log(avctx, AV_LOG_ERROR, "Unexpected grandchildren\n");
565 return AVERROR_INVALIDDATA;
566 }
567 if (!i) {
568 wmv9_mask = arith2_get_bit(&acoder) - 1;
569 if (!wmv9_mask)
570 wmv9_mask = arith2_get_number(&acoder, 256);
571 }
572 wmv9rects[i].coded = arith2_get_number(&acoder, 2);
573 }
574
575 buf += arith2_get_consumed_bytes(&acoder);
576 buf_size -= arith2_get_consumed_bytes(&acoder);
577 if (buf_size < 1)
578 return AVERROR_INVALIDDATA;
579 }
580
581 c->mvX = c->mvY = 0;
582 if (keyframe && !is_555) {
583 if ((i = decode_pal_v2(c, buf, buf_size)) < 0)
584 return AVERROR_INVALIDDATA;
585 buf += i;
586 buf_size -= i;
587 } else if (has_mv) {
588 buf += 4;
589 buf_size -= 4;
590 if (buf_size < 1)
591 return AVERROR_INVALIDDATA;
592 c->mvX = AV_RB16(buf - 4) - avctx->width;
593 c->mvY = AV_RB16(buf - 2) - avctx->height;
594 }
595
596 if (c->mvX < 0 || c->mvY < 0) {
597 FFSWAP(AVFrame, ctx->pic, ctx->last_pic);
598 FFSWAP(uint8_t *, c->pal_pic, c->last_pal_pic);
599
600 if (ctx->pic.data[0])
601 avctx->release_buffer(avctx, &ctx->pic);
602
603 ctx->pic.reference = 3;
604 ctx->pic.buffer_hints = FF_BUFFER_HINTS_VALID |
605 FF_BUFFER_HINTS_READABLE |
606 FF_BUFFER_HINTS_PRESERVE |
607 FF_BUFFER_HINTS_REUSABLE;
608
609 if ((ret = avctx->get_buffer(avctx, &ctx->pic)) < 0) {
610 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
611 return ret;
612 }
613
614 if (ctx->last_pic.data[0]) {
615 av_assert0(ctx->pic.linesize[0] == ctx->last_pic.linesize[0]);
616 c->last_rgb_pic = ctx->last_pic.data[0] +
617 ctx->last_pic.linesize[0] * (avctx->height - 1);
618 } else {
619 av_log(avctx, AV_LOG_ERROR, "Missing keyframe\n");
620 return -1;
621 }
622 } else {
623 if (ctx->last_pic.data[0])
624 avctx->release_buffer(avctx, &ctx->last_pic);
625
626 ctx->pic.reference = 3;
627 ctx->pic.buffer_hints = FF_BUFFER_HINTS_VALID |
628 FF_BUFFER_HINTS_READABLE |
629 FF_BUFFER_HINTS_PRESERVE |
630 FF_BUFFER_HINTS_REUSABLE;
631
632 if ((ret = avctx->reget_buffer(avctx, &ctx->pic)) < 0) {
633 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
634 return ret;
635 }
636
637 c->last_rgb_pic = NULL;
638 }
639 c->rgb_pic = ctx->pic.data[0] +
640 ctx->pic.linesize[0] * (avctx->height - 1);
641 c->rgb_stride = -ctx->pic.linesize[0];
642
643 ctx->pic.key_frame = keyframe;
644 ctx->pic.pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
645
646 if (is_555) {
647 bytestream2_init(&gB, buf, buf_size);
648
649 if (decode_555(&gB, (uint16_t *)c->rgb_pic, c->rgb_stride >> 1,
650 keyframe, avctx->width, avctx->height))
651 return AVERROR_INVALIDDATA;
652
653 buf_size -= bytestream2_tell(&gB);
654 } else if (is_rle) {
655 init_get_bits(&gb, buf, buf_size * 8);
656 if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
657 c->rgb_pic, c->rgb_stride, c->pal, keyframe,
658 ctx->split_position, 0,
659 avctx->width, avctx->height))
660 return ret;
661 align_get_bits(&gb);
662
663 if (c->slice_split)
664 if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
665 c->rgb_pic, c->rgb_stride, c->pal, keyframe,
666 ctx->split_position, 1,
667 avctx->width, avctx->height))
668 return ret;
669
670 align_get_bits(&gb);
671 buf += get_bits_count(&gb) >> 3;
672 buf_size -= get_bits_count(&gb) >> 3;
673 } else {
674 if (keyframe)
675 ff_mss12_codec_reset(c);
676 else if (c->corrupted)
677 return AVERROR_INVALIDDATA;
678 bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
679 arith2_init(&acoder, &gB);
680 c->keyframe = keyframe;
681 if (c->corrupted = ff_mss12_decode_rect(&c->sc[0], &acoder, 0, 0,
682 avctx->width,
683 ctx->split_position))
684 return AVERROR_INVALIDDATA;
685
686 buf += arith2_get_consumed_bytes(&acoder);
687 buf_size -= arith2_get_consumed_bytes(&acoder);
688 if (c->slice_split) {
689 if (buf_size < 1)
690 return AVERROR_INVALIDDATA;
691 bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
692 arith2_init(&acoder, &gB);
693 if (c->corrupted = ff_mss12_decode_rect(&c->sc[1], &acoder, 0,
694 ctx->split_position,
695 avctx->width,
696 avctx->height - ctx->split_position))
697 return AVERROR_INVALIDDATA;
698
699 buf += arith2_get_consumed_bytes(&acoder);
700 buf_size -= arith2_get_consumed_bytes(&acoder);
701 }
702 }
703
704 if (has_wmv9) {
705 for (i = 0; i < used_rects; i++) {
706 int x = wmv9rects[i].x;
707 int y = wmv9rects[i].y;
708 int w = wmv9rects[i].w;
709 int h = wmv9rects[i].h;
710 if (wmv9rects[i].coded) {
711 int WMV9codedFrameSize;
712 if (buf_size < 4 || !(WMV9codedFrameSize = AV_RL24(buf)))
713 return AVERROR_INVALIDDATA;
714 if (ret = decode_wmv9(avctx, buf + 3, buf_size - 3,
715 x, y, w, h, wmv9_mask))
716 return ret;
717 buf += WMV9codedFrameSize + 3;
718 buf_size -= WMV9codedFrameSize + 3;
719 } else {
720 uint8_t *dst = c->rgb_pic + y * c->rgb_stride + x * 3;
721 if (wmv9_mask != -1) {
722 ctx->dsp.mss2_gray_fill_masked(dst, c->rgb_stride,
723 wmv9_mask,
724 c->pal_pic + y * c->pal_stride + x,
725 c->pal_stride,
726 w, h);
727 } else {
728 do {
729 memset(dst, 0x80, w * 3);
730 dst += c->rgb_stride;
731 } while (--h);
732 }
733 }
734 }
735 }
736
737 if (buf_size)
738 av_log(avctx, AV_LOG_WARNING, "buffer not fully consumed\n");
739
740 *data_size = sizeof(AVFrame);
741 *(AVFrame *)data = ctx->pic;
742
743 return avpkt->size;
744}
745
746static av_cold int wmv9_init(AVCodecContext *avctx)
747{
748 VC1Context *v = avctx->priv_data;
749
750 v->s.avctx = avctx;
751 avctx->flags |= CODEC_FLAG_EMU_EDGE;
752 v->s.flags |= CODEC_FLAG_EMU_EDGE;
753
754 if (avctx->idct_algo == FF_IDCT_AUTO)
755 avctx->idct_algo = FF_IDCT_WMV2;
756
757 if (ff_vc1_init_common(v) < 0)
758 return -1;
759 ff_vc1dsp_init(&v->vc1dsp);
760
761 v->profile = PROFILE_MAIN;
762
763 v->zz_8x4 = ff_wmv2_scantableA;
764 v->zz_4x8 = ff_wmv2_scantableB;
765 v->res_y411 = 0;
766 v->res_sprite = 0;
767
768 v->frmrtq_postproc = 7;
769 v->bitrtq_postproc = 31;
770
771 v->res_x8 = 0;
772 v->multires = 0;
773 v->res_fasttx = 1;
774
775 v->fastuvmc = 0;
776
777 v->extended_mv = 0;
778
779 v->dquant = 1;
780 v->vstransform = 1;
781
782 v->res_transtab = 0;
783
784 v->overlap = 0;
785
786 v->s.resync_marker = 0;
787 v->rangered = 0;
788
789 v->s.max_b_frames = avctx->max_b_frames = 0;
790 v->quantizer_mode = 0;
791
792 v->finterpflag = 0;
793
794 v->res_rtm_flag = 1;
795
796 ff_vc1_init_transposed_scantables(v);
797
798 if (ff_msmpeg4_decode_init(avctx) < 0 ||
799 ff_vc1_decode_init_alloc_tables(v) < 0)
800 return -1;
801
802 /* error concealment */
803 v->s.me.qpel_put = v->s.dsp.put_qpel_pixels_tab;
804 v->s.me.qpel_avg = v->s.dsp.avg_qpel_pixels_tab;
805
806 return 0;
807}
808
809static av_cold int mss2_decode_end(AVCodecContext *avctx)
810{
811 MSS2Context *const ctx = avctx->priv_data;
812
813 if (ctx->pic.data[0])
814 avctx->release_buffer(avctx, &ctx->pic);
815 if (ctx->last_pic.data[0])
816 avctx->release_buffer(avctx, &ctx->last_pic);
817
818 ff_mss12_decode_end(&ctx->c);
819 av_freep(&ctx->c.pal_pic);
820 av_freep(&ctx->c.last_pal_pic);
821 ff_vc1_decode_end(avctx);
822
823 return 0;
824}
825
826static av_cold int mss2_decode_init(AVCodecContext *avctx)
827{
828 MSS2Context * const ctx = avctx->priv_data;
829 MSS12Context *c = &ctx->c;
830 int ret;
831 c->avctx = avctx;
832 avctx->coded_frame = &ctx->pic;
833 if (ret = ff_mss12_decode_init(c, 1))
834 return ret;
835 c->pal_stride = c->mask_stride;
836 c->pal_pic = av_malloc(c->pal_stride * avctx->height);
837 c->last_pal_pic = av_malloc(c->pal_stride * avctx->height);
838 if (!c->pal_pic || !c->last_pal_pic) {
839 mss2_decode_end(avctx);
840 return AVERROR(ENOMEM);
841 }
842 if (ret = wmv9_init(avctx)) {
843 mss2_decode_end(avctx);
844 return ret;
845 }
846 ff_mss2dsp_init(&ctx->dsp);
847 return 0;
848}
849
850AVCodec ff_mss2_decoder = {
851 .name = "mss2",
852 .type = AVMEDIA_TYPE_VIDEO,
853 .id = AV_CODEC_ID_MSS2,
854 .priv_data_size = sizeof(MSS2Context),
855 .init = mss2_decode_init,
856 .close = mss2_decode_end,
857 .decode = mss2_decode_frame,
858 .capabilities = CODEC_CAP_DR1,
859 .long_name = NULL_IF_CONFIG_SMALL("MS Windows Media Video V9 Screen"),
860};