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aarch64: Add assembly support for -fsanitize=hwaddress tagged globals.
[libav.git] / libavcodec / mss2.c
blob6fcadb16c9c45d800ef9b1af4720a101ec1e6090
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 "error_resilience.h"
28 #include "internal.h"
29 #include "mpeg_er.h"
30 #include "msmpeg4.h"
31 #include "qpeldsp.h"
32 #include "vc1.h"
33 #include "wmv2data.h"
34 #include "mss12.h"
35 #include "mss2dsp.h"
36
37 typedef struct MSS2Context {
38 VC1Context v;
39 int split_position;
40 AVFrame *last_pic;
41 MSS12Context c;
42 MSS2DSPContext dsp;
43 QpelDSPContext qdsp;
44 SliceContext sc[2];
45 } MSS2Context;
46
47 static void arith2_normalise(ArithCoder *c)
48 {
49 while ((c->high >> 15) - (c->low >> 15) < 2) {
50 if ((c->low ^ c->high) & 0x10000) {
51 c->high ^= 0x8000;
52 c->value ^= 0x8000;
53 c->low ^= 0x8000;
54 }
55 c->high = c->high << 8 & 0xFFFFFF | 0xFF;
56 c->value = c->value << 8 & 0xFFFFFF | bytestream2_get_byte(c->gbc.gB);
57 c->low = c->low << 8 & 0xFFFFFF;
58 }
59 }
60
61 ARITH_GET_BIT(2)
62
63 /* L. Stuiver and A. Moffat: "Piecewise Integer Mapping for Arithmetic Coding."
64 * In Proc. 8th Data Compression Conference (DCC '98), pp. 3-12, Mar. 1998 */
65
66 static int arith2_get_scaled_value(int value, int n, int range)
67 {
68 int split = (n << 1) - range;
69
70 if (value > split)
71 return split + (value - split >> 1);
72 else
73 return value;
74 }
75
76 static void arith2_rescale_interval(ArithCoder *c, int range,
77 int low, int high, int n)
78 {
79 int split = (n << 1) - range;
80
81 if (high > split)
82 c->high = split + (high - split << 1);
83 else
84 c->high = high;
85
86 c->high += c->low - 1;
87
88 if (low > split)
89 c->low += split + (low - split << 1);
90 else
91 c->low += low;
92 }
93
94 static int arith2_get_number(ArithCoder *c, int n)
95 {
96 int range = c->high - c->low + 1;
97 int scale = av_log2(range) - av_log2(n);
98 int val;
99
100 if (n << scale > range)
101 scale--;
102
103 n <<= scale;
104
105 val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
106
107 arith2_rescale_interval(c, range, val << scale, (val + 1) << scale, n);
108
109 arith2_normalise(c);
110
111 return val;
112 }
113
114 static int arith2_get_prob(ArithCoder *c, int16_t *probs)
115 {
116 int range = c->high - c->low + 1, n = *probs;
117 int scale = av_log2(range) - av_log2(n);
118 int i = 0, val;
119
120 if (n << scale > range)
121 scale--;
122
123 n <<= scale;
124
125 val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
126 while (probs[++i] > val) ;
127
128 arith2_rescale_interval(c, range,
129 probs[i] << scale, probs[i - 1] << scale, n);
130
131 return i;
132 }
133
134 ARITH_GET_MODEL_SYM(2)
135
136 static int arith2_get_consumed_bytes(ArithCoder *c)
137 {
138 int diff = (c->high >> 16) - (c->low >> 16);
139 int bp = bytestream2_tell(c->gbc.gB) - 3 << 3;
140 int bits = 1;
141
142 while (!(diff & 0x80)) {
143 bits++;
144 diff <<= 1;
145 }
146
147 return (bits + bp + 7 >> 3) + ((c->low >> 16) + 1 == c->high >> 16);
148 }
149
150 static void arith2_init(ArithCoder *c, GetByteContext *gB)
151 {
152 c->low = 0;
153 c->high = 0xFFFFFF;
154 c->value = bytestream2_get_be24(gB);
155 c->gbc.gB = gB;
156 c->get_model_sym = arith2_get_model_sym;
157 c->get_number = arith2_get_number;
158 }
159
160 static int decode_pal_v2(MSS12Context *ctx, const uint8_t *buf, int buf_size)
161 {
162 int i, ncol;
163 uint32_t *pal = ctx->pal + 256 - ctx->free_colours;
164
165 if (!ctx->free_colours)
166 return 0;
167
168 ncol = *buf++;
169 if (ncol > ctx->free_colours || buf_size < 2 + ncol * 3)
170 return AVERROR_INVALIDDATA;
171 for (i = 0; i < ncol; i++)
172 *pal++ = AV_RB24(buf + 3 * i);
173
174 return 1 + ncol * 3;
175 }
176
177 static int decode_555(GetByteContext *gB, uint16_t *dst, ptrdiff_t stride,
178 int keyframe, int w, int h)
179 {
180 int last_symbol = 0, repeat = 0, prev_avail = 0;
181
182 if (!keyframe) {
183 int x, y, endx, endy, t;
184
185 #define READ_PAIR(a, b) \
186 a = bytestream2_get_byte(gB) << 4; \
187 t = bytestream2_get_byte(gB); \
188 a |= t >> 4; \
189 b = (t & 0xF) << 8; \
190 b |= bytestream2_get_byte(gB); \
191
192 READ_PAIR(x, endx)
193 READ_PAIR(y, endy)
194
195 if (endx >= w || endy >= h || x > endx || y > endy)
196 return AVERROR_INVALIDDATA;
197 dst += x + stride * y;
198 w = endx - x + 1;
199 h = endy - y + 1;
200 if (y)
201 prev_avail = 1;
202 }
203
204 do {
205 uint16_t *p = dst;
206 do {
207 if (repeat-- < 1) {
208 int b = bytestream2_get_byte(gB);
209 if (b < 128)
210 last_symbol = b << 8 | bytestream2_get_byte(gB);
211 else if (b > 129) {
212 repeat = 0;
213 while (b-- > 130)
214 repeat = (repeat << 8) + bytestream2_get_byte(gB) + 1;
215 if (last_symbol == -2) {
216 int skip = FFMIN((unsigned)repeat, dst + w - p);
217 repeat -= skip;
218 p += skip;
219 }
220 } else
221 last_symbol = 127 - b;
222 }
223 if (last_symbol >= 0)
224 *p = last_symbol;
225 else if (last_symbol == -1 && prev_avail)
226 *p = *(p - stride);
227 } while (++p < dst + w);
228 dst += stride;
229 prev_avail = 1;
230 } while (--h);
231
232 return 0;
233 }
234
235 static int decode_rle(GetBitContext *gb, uint8_t *pal_dst, ptrdiff_t pal_stride,
236 uint8_t *rgb_dst, ptrdiff_t rgb_stride, uint32_t *pal,
237 int keyframe, int kf_slipt, int slice, int w, int h)
238 {
239 uint8_t bits[270] = { 0 };
240 uint32_t codes[270];
241 VLC vlc;
242
243 int current_length = 0, read_codes = 0, next_code = 0, current_codes = 0;
244 int remaining_codes, surplus_codes, i;
245
246 const int alphabet_size = 270 - keyframe;
247
248 int last_symbol = 0, repeat = 0, prev_avail = 0;
249
250 if (!keyframe) {
251 int x, y, clipw, cliph;
252
253 x = get_bits(gb, 12);
254 y = get_bits(gb, 12);
255 clipw = get_bits(gb, 12) + 1;
256 cliph = get_bits(gb, 12) + 1;
257
258 if (x + clipw > w || y + cliph > h)
259 return AVERROR_INVALIDDATA;
260 pal_dst += pal_stride * y + x;
261 rgb_dst += rgb_stride * y + x * 3;
262 w = clipw;
263 h = cliph;
264 if (y)
265 prev_avail = 1;
266 } else {
267 if (slice > 0) {
268 pal_dst += pal_stride * kf_slipt;
269 rgb_dst += rgb_stride * kf_slipt;
270 prev_avail = 1;
271 h -= kf_slipt;
272 } else
273 h = kf_slipt;
274 }
275
276 /* read explicit codes */
277 do {
278 while (current_codes--) {
279 int symbol = get_bits(gb, 8);
280 if (symbol >= 204 - keyframe)
281 symbol += 14 - keyframe;
282 else if (symbol > 189)
283 symbol = get_bits1(gb) + (symbol << 1) - 190;
284 if (bits[symbol])
285 return AVERROR_INVALIDDATA;
286 bits[symbol] = current_length;
287 codes[symbol] = next_code++;
288 read_codes++;
289 }
290 current_length++;
291 next_code <<= 1;
292 remaining_codes = (1 << current_length) - next_code;
293 current_codes = get_bits(gb, av_ceil_log2(remaining_codes + 1));
294 if (current_length > 22 || current_codes > remaining_codes)
295 return AVERROR_INVALIDDATA;
296 } while (current_codes != remaining_codes);
297
298 remaining_codes = alphabet_size - read_codes;
299
300 /* determine the minimum length to fit the rest of the alphabet */
301 while ((surplus_codes = (2 << current_length) -
302 (next_code << 1) - remaining_codes) < 0) {
303 current_length++;
304 next_code <<= 1;
305 }
306
307 /* add the rest of the symbols lexicographically */
308 for (i = 0; i < alphabet_size; i++)
309 if (!bits[i]) {
310 if (surplus_codes-- == 0) {
311 current_length++;
312 next_code <<= 1;
313 }
314 bits[i] = current_length;
315 codes[i] = next_code++;
316 }
317
318 if (next_code != 1 << current_length)
319 return AVERROR_INVALIDDATA;
320
321 if (i = init_vlc(&vlc, 9, alphabet_size, bits, 1, 1, codes, 4, 4, 0))
322 return i;
323
324 /* frame decode */
325 do {
326 uint8_t *pp = pal_dst;
327 uint8_t *rp = rgb_dst;
328 do {
329 if (repeat-- < 1) {
330 int b = get_vlc2(gb, vlc.table, 9, 3);
331 if (b < 256)
332 last_symbol = b;
333 else if (b < 268) {
334 b -= 256;
335 if (b == 11)
336 b = get_bits(gb, 4) + 10;
337
338 if (!b)
339 repeat = 0;
340 else
341 repeat = get_bits(gb, b);
342
343 repeat += (1 << b) - 1;
344
345 if (last_symbol == -2) {
346 int skip = FFMIN(repeat, pal_dst + w - pp);
347 repeat -= skip;
348 pp += skip;
349 rp += skip * 3;
350 }
351 } else
352 last_symbol = 267 - b;
353 }
354 if (last_symbol >= 0) {
355 *pp = last_symbol;
356 AV_WB24(rp, pal[last_symbol]);
357 } else if (last_symbol == -1 && prev_avail) {
358 *pp = *(pp - pal_stride);
359 memcpy(rp, rp - rgb_stride, 3);
360 }
361 rp += 3;
362 } while (++pp < pal_dst + w);
363 pal_dst += pal_stride;
364 rgb_dst += rgb_stride;
365 prev_avail = 1;
366 } while (--h);
367
368 ff_free_vlc(&vlc);
369 return 0;
370 }
371
372 static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size,
373 int x, int y, int w, int h, int wmv9_mask)
374 {
375 MSS2Context *ctx = avctx->priv_data;
376 MSS12Context *c = &ctx->c;
377 VC1Context *v = avctx->priv_data;
378 MpegEncContext *s = &v->s;
379 AVFrame *f;
380 int ret;
381
382 ff_mpeg_flush(avctx);
383
384 init_get_bits(&s->gb, buf, buf_size * 8);
385
386 s->loop_filter = avctx->skip_loop_filter < AVDISCARD_ALL;
387
388 if (ff_vc1_parse_frame_header(v, &s->gb) < 0) {
389 av_log(v->s.avctx, AV_LOG_ERROR, "header error\n");
390 return AVERROR_INVALIDDATA;
391 }
392
393 if (s->pict_type != AV_PICTURE_TYPE_I) {
394 av_log(v->s.avctx, AV_LOG_ERROR, "expected I-frame\n");
395 return AVERROR_INVALIDDATA;
396 }
397
398 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
399
400 if ((ret = ff_mpv_frame_start(s, avctx)) < 0) {
401 av_log(v->s.avctx, AV_LOG_ERROR, "ff_mpv_frame_start error\n");
402 avctx->pix_fmt = AV_PIX_FMT_RGB24;
403 return ret;
404 }
405
406 ff_mpeg_er_frame_start(s);
407
408 v->bits = buf_size * 8;
409
410 v->end_mb_x = (w + 15) >> 4;
411 s->end_mb_y = (h + 15) >> 4;
412 if (v->respic & 1)
413 v->end_mb_x = v->end_mb_x + 1 >> 1;
414 if (v->respic & 2)
415 s->end_mb_y = s->end_mb_y + 1 >> 1;
416
417 ff_vc1_decode_blocks(v);
418
419 if (v->end_mb_x == s->mb_width && s->end_mb_y == s->mb_height) {
420 ff_er_frame_end(&s->er);
421 } else {
422 av_log(v->s.avctx, AV_LOG_WARNING,
423 "disabling error correction due to block count mismatch %dx%d != %dx%d\n",
424 v->end_mb_x, s->end_mb_y, s->mb_width, s->mb_height);
425 }
426
427 ff_mpv_frame_end(s);
428
429 f = s->current_picture.f;
430
431 if (v->respic == 3) {
432 ctx->dsp.upsample_plane(f->data[0], f->linesize[0], w, h);
433 ctx->dsp.upsample_plane(f->data[1], f->linesize[1], w >> 1, h >> 1);
434 ctx->dsp.upsample_plane(f->data[2], f->linesize[2], w >> 1, h >> 1);
435 } else if (v->respic)
436 avpriv_request_sample(v->s.avctx,
437 "Asymmetric WMV9 rectangle subsampling");
438
439 av_assert0(f->linesize[1] == f->linesize[2]);
440
441 if (wmv9_mask != -1)
442 ctx->dsp.mss2_blit_wmv9_masked(c->rgb_pic + y * c->rgb_stride + x * 3,
443 c->rgb_stride, wmv9_mask,
444 c->pal_pic + y * c->pal_stride + x,
445 c->pal_stride,
446 f->data[0], f->linesize[0],
447 f->data[1], f->data[2], f->linesize[1],
448 w, h);
449 else
450 ctx->dsp.mss2_blit_wmv9(c->rgb_pic + y * c->rgb_stride + x * 3,
451 c->rgb_stride,
452 f->data[0], f->linesize[0],
453 f->data[1], f->data[2], f->linesize[1],
454 w, h);
455
456 avctx->pix_fmt = AV_PIX_FMT_RGB24;
457
458 return 0;
459 }
460
461 typedef struct Rectangle {
462 int coded, x, y, w, h;
463 } Rectangle;
464
465 #define MAX_WMV9_RECTANGLES 20
466 #define ARITH2_PADDING 2
467
468 static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
469 AVPacket *avpkt)
470 {
471 const uint8_t *buf = avpkt->data;
472 int buf_size = avpkt->size;
473 MSS2Context *ctx = avctx->priv_data;
474 MSS12Context *c = &ctx->c;
475 AVFrame *frame = data;
476 GetBitContext gb;
477 GetByteContext gB;
478 ArithCoder acoder;
479
480 int keyframe, has_wmv9, has_mv, is_rle, is_555, ret;
481
482 Rectangle wmv9rects[MAX_WMV9_RECTANGLES], *r;
483 int used_rects = 0, i, implicit_rect = 0, av_uninit(wmv9_mask);
484
485 init_get_bits(&gb, buf, buf_size * 8);
486
487 if (keyframe = get_bits1(&gb))
488 skip_bits(&gb, 7);
489 has_wmv9 = get_bits1(&gb);
490 has_mv = keyframe ? 0 : get_bits1(&gb);
491 is_rle = get_bits1(&gb);
492 is_555 = is_rle && get_bits1(&gb);
493 if (c->slice_split > 0)
494 ctx->split_position = c->slice_split;
495 else if (c->slice_split < 0) {
496 if (get_bits1(&gb)) {
497 if (get_bits1(&gb)) {
498 if (get_bits1(&gb))
499 ctx->split_position = get_bits(&gb, 16);
500 else
501 ctx->split_position = get_bits(&gb, 12);
502 } else
503 ctx->split_position = get_bits(&gb, 8) << 4;
504 } else {
505 if (keyframe)
506 ctx->split_position = avctx->height / 2;
507 }
508 } else
509 ctx->split_position = avctx->height;
510
511 if (c->slice_split && (ctx->split_position < 1 - is_555 ||
512 ctx->split_position > avctx->height - 1))
513 return AVERROR_INVALIDDATA;
514
515 align_get_bits(&gb);
516 buf += get_bits_count(&gb) >> 3;
517 buf_size -= get_bits_count(&gb) >> 3;
518
519 if (buf_size < 1)
520 return AVERROR_INVALIDDATA;
521
522 if (is_555 && (has_wmv9 || has_mv || c->slice_split && ctx->split_position))
523 return AVERROR_INVALIDDATA;
524
525 avctx->pix_fmt = is_555 ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_RGB24;
526 if (ctx->last_pic->format != avctx->pix_fmt)
527 av_frame_unref(ctx->last_pic);
528
529 if (has_wmv9) {
530 bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
531 arith2_init(&acoder, &gB);
532
533 implicit_rect = !arith2_get_bit(&acoder);
534
535 while (arith2_get_bit(&acoder)) {
536 if (used_rects == MAX_WMV9_RECTANGLES)
537 return AVERROR_INVALIDDATA;
538 r = &wmv9rects[used_rects];
539 if (!used_rects)
540 r->x = arith2_get_number(&acoder, avctx->width);
541 else
542 r->x = arith2_get_number(&acoder, avctx->width -
543 wmv9rects[used_rects - 1].x) +
544 wmv9rects[used_rects - 1].x;
545 r->y = arith2_get_number(&acoder, avctx->height);
546 r->w = arith2_get_number(&acoder, avctx->width - r->x) + 1;
547 r->h = arith2_get_number(&acoder, avctx->height - r->y) + 1;
548 used_rects++;
549 }
550
551 if (implicit_rect && used_rects) {
552 av_log(avctx, AV_LOG_ERROR, "implicit_rect && used_rects > 0\n");
553 return AVERROR_INVALIDDATA;
554 }
555
556 if (implicit_rect) {
557 wmv9rects[0].x = 0;
558 wmv9rects[0].y = 0;
559 wmv9rects[0].w = avctx->width;
560 wmv9rects[0].h = avctx->height;
561
562 used_rects = 1;
563 }
564 for (i = 0; i < used_rects; i++) {
565 if (!implicit_rect && arith2_get_bit(&acoder)) {
566 av_log(avctx, AV_LOG_ERROR, "Unexpected grandchildren\n");
567 return AVERROR_INVALIDDATA;
568 }
569 if (!i) {
570 wmv9_mask = arith2_get_bit(&acoder) - 1;
571 if (!wmv9_mask)
572 wmv9_mask = arith2_get_number(&acoder, 256);
573 }
574 wmv9rects[i].coded = arith2_get_number(&acoder, 2);
575 }
576
577 buf += arith2_get_consumed_bytes(&acoder);
578 buf_size -= arith2_get_consumed_bytes(&acoder);
579 if (buf_size < 1)
580 return AVERROR_INVALIDDATA;
581 }
582
583 c->mvX = c->mvY = 0;
584 if (keyframe && !is_555) {
585 if ((i = decode_pal_v2(c, buf, buf_size)) < 0)
586 return AVERROR_INVALIDDATA;
587 buf += i;
588 buf_size -= i;
589 } else if (has_mv) {
590 buf += 4;
591 buf_size -= 4;
592 if (buf_size < 1)
593 return AVERROR_INVALIDDATA;
594 c->mvX = AV_RB16(buf - 4) - avctx->width;
595 c->mvY = AV_RB16(buf - 2) - avctx->height;
596 }
597
598 if (c->mvX < 0 || c->mvY < 0) {
599 FFSWAP(uint8_t *, c->pal_pic, c->last_pal_pic);
600
601 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) {
602 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
603 return ret;
604 }
605
606 if (ctx->last_pic->data[0]) {
607 av_assert0(frame->linesize[0] == ctx->last_pic->linesize[0]);
608 c->last_rgb_pic = ctx->last_pic->data[0] +
609 ctx->last_pic->linesize[0] * (avctx->height - 1);
610 } else {
611 av_log(avctx, AV_LOG_ERROR, "Missing keyframe\n");
612 return AVERROR_INVALIDDATA;
613 }
614 } else {
615 if ((ret = ff_reget_buffer(avctx, ctx->last_pic)) < 0) {
616 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
617 return ret;
618 }
619 if ((ret = av_frame_ref(frame, ctx->last_pic)) < 0)
620 return ret;
621
622 c->last_rgb_pic = NULL;
623 }
624 c->rgb_pic = frame->data[0] +
625 frame->linesize[0] * (avctx->height - 1);
626 c->rgb_stride = -frame->linesize[0];
627
628 frame->key_frame = keyframe;
629 frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
630
631 if (is_555) {
632 bytestream2_init(&gB, buf, buf_size);
633
634 if (decode_555(&gB, (uint16_t *)c->rgb_pic, c->rgb_stride >> 1,
635 keyframe, avctx->width, avctx->height))
636 return AVERROR_INVALIDDATA;
637
638 buf_size -= bytestream2_tell(&gB);
639 } else {
640 if (keyframe) {
641 c->corrupted = 0;
642 ff_mss12_slicecontext_reset(&ctx->sc[0]);
643 if (c->slice_split)
644 ff_mss12_slicecontext_reset(&ctx->sc[1]);
645 }
646 if (is_rle) {
647 init_get_bits(&gb, buf, buf_size * 8);
648 if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
649 c->rgb_pic, c->rgb_stride, c->pal, keyframe,
650 ctx->split_position, 0,
651 avctx->width, avctx->height))
652 return ret;
653 align_get_bits(&gb);
654
655 if (c->slice_split)
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, 1,
659 avctx->width, avctx->height))
660 return ret;
661
662 align_get_bits(&gb);
663 buf += get_bits_count(&gb) >> 3;
664 buf_size -= get_bits_count(&gb) >> 3;
665 } else if (!implicit_rect || wmv9_mask != -1) {
666 if (c->corrupted)
667 return AVERROR_INVALIDDATA;
668 bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
669 arith2_init(&acoder, &gB);
670 c->keyframe = keyframe;
671 if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[0], &acoder, 0, 0,
672 avctx->width,
673 ctx->split_position))
674 return AVERROR_INVALIDDATA;
675
676 buf += arith2_get_consumed_bytes(&acoder);
677 buf_size -= arith2_get_consumed_bytes(&acoder);
678 if (c->slice_split) {
679 if (buf_size < 1)
680 return AVERROR_INVALIDDATA;
681 bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
682 arith2_init(&acoder, &gB);
683 if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[1], &acoder, 0,
684 ctx->split_position,
685 avctx->width,
686 avctx->height - ctx->split_position))
687 return AVERROR_INVALIDDATA;
688
689 buf += arith2_get_consumed_bytes(&acoder);
690 buf_size -= arith2_get_consumed_bytes(&acoder);
691 }
692 } else
693 memset(c->pal_pic, 0, c->pal_stride * avctx->height);
694 }
695
696 if (has_wmv9) {
697 for (i = 0; i < used_rects; i++) {
698 int x = wmv9rects[i].x;
699 int y = wmv9rects[i].y;
700 int w = wmv9rects[i].w;
701 int h = wmv9rects[i].h;
702 if (wmv9rects[i].coded) {
703 int WMV9codedFrameSize;
704 if (buf_size < 4 || !(WMV9codedFrameSize = AV_RL24(buf)))
705 return AVERROR_INVALIDDATA;
706 if (ret = decode_wmv9(avctx, buf + 3, buf_size - 3,
707 x, y, w, h, wmv9_mask))
708 return ret;
709 buf += WMV9codedFrameSize + 3;
710 buf_size -= WMV9codedFrameSize + 3;
711 } else {
712 uint8_t *dst = c->rgb_pic + y * c->rgb_stride + x * 3;
713 if (wmv9_mask != -1) {
714 ctx->dsp.mss2_gray_fill_masked(dst, c->rgb_stride,
715 wmv9_mask,
716 c->pal_pic + y * c->pal_stride + x,
717 c->pal_stride,
718 w, h);
719 } else {
720 do {
721 memset(dst, 0x80, w * 3);
722 dst += c->rgb_stride;
723 } while (--h);
724 }
725 }
726 }
727 }
728
729 if (buf_size)
730 av_log(avctx, AV_LOG_WARNING, "buffer not fully consumed\n");
731
732 if (c->mvX < 0 || c->mvY < 0) {
733 av_frame_unref(ctx->last_pic);
734 ret = av_frame_ref(ctx->last_pic, frame);
735 if (ret < 0)
736 return ret;
737 }
738
739 *got_frame = 1;
740
741 return avpkt->size;
742 }
743
744 static av_cold int wmv9_init(AVCodecContext *avctx)
745 {
746 VC1Context *v = avctx->priv_data;
747 int ret;
748
749 v->s.avctx = avctx;
750
751 if ((ret = ff_vc1_init_common(v)) < 0)
752 return ret;
753 ff_vc1dsp_init(&v->vc1dsp);
754
755 v->profile = PROFILE_MAIN;
756
757 v->zz_8x4 = ff_wmv2_scantableA;
758 v->zz_4x8 = ff_wmv2_scantableB;
759 v->res_y411 = 0;
760 v->res_sprite = 0;
761
762 v->frmrtq_postproc = 7;
763 v->bitrtq_postproc = 31;
764
765 v->res_x8 = 0;
766 v->multires = 0;
767 v->res_fasttx = 1;
768
769 v->fastuvmc = 0;
770
771 v->extended_mv = 0;
772
773 v->dquant = 1;
774 v->vstransform = 1;
775
776 v->res_transtab = 0;
777
778 v->overlap = 0;
779
780 v->resync_marker = 0;
781 v->rangered = 0;
782
783 v->s.max_b_frames = avctx->max_b_frames = 0;
784 v->quantizer_mode = 0;
785
786 v->finterpflag = 0;
787
788 v->res_rtm_flag = 1;
789
790 ff_vc1_init_transposed_scantables(v);
791
792 if ((ret = ff_msmpeg4_decode_init(avctx)) < 0 ||
793 (ret = ff_vc1_decode_init_alloc_tables(v)) < 0)
794 return ret;
795
796 /* error concealment */
797 v->s.me.qpel_put = v->s.qdsp.put_qpel_pixels_tab;
798 v->s.me.qpel_avg = v->s.qdsp.avg_qpel_pixels_tab;
799
800 return 0;
801 }
802
803 static av_cold int mss2_decode_end(AVCodecContext *avctx)
804 {
805 MSS2Context *const ctx = avctx->priv_data;
806
807 av_frame_free(&ctx->last_pic);
808
809 ff_mss12_decode_end(&ctx->c);
810 av_freep(&ctx->c.pal_pic);
811 av_freep(&ctx->c.last_pal_pic);
812 ff_vc1_decode_end(avctx);
813
814 return 0;
815 }
816
817 static av_cold int mss2_decode_init(AVCodecContext *avctx)
818 {
819 MSS2Context * const ctx = avctx->priv_data;
820 MSS12Context *c = &ctx->c;
821 int ret;
822 c->avctx = avctx;
823 if (ret = ff_mss12_decode_init(c, 1, &ctx->sc[0], &ctx->sc[1]))
824 return ret;
825 c->pal_stride = c->mask_stride;
826 c->pal_pic = av_mallocz(c->pal_stride * avctx->height);
827 c->last_pal_pic = av_mallocz(c->pal_stride * avctx->height);
828 if (!c->pal_pic || !c->last_pal_pic) {
829 mss2_decode_end(avctx);
830 return AVERROR(ENOMEM);
831 }
832 if (ret = wmv9_init(avctx)) {
833 mss2_decode_end(avctx);
834 return ret;
835 }
836 ff_mss2dsp_init(&ctx->dsp);
837 ff_qpeldsp_init(&ctx->qdsp);
838
839 avctx->pix_fmt = c->free_colours == 127 ? AV_PIX_FMT_RGB555
840 : AV_PIX_FMT_RGB24;
841
842 ctx->last_pic = av_frame_alloc();
843 if (!ctx->last_pic) {
844 mss2_decode_end(avctx);
845 return AVERROR(ENOMEM);
846 }
847
848 return 0;
849 }
850
851 AVCodec ff_mss2_decoder = {
852 .name = "mss2",
853 .long_name = NULL_IF_CONFIG_SMALL("MS Windows Media Video V9 Screen"),
854 .type = AVMEDIA_TYPE_VIDEO,
855 .id = AV_CODEC_ID_MSS2,
856 .priv_data_size = sizeof(MSS2Context),
857 .init = mss2_decode_init,
858 .close = mss2_decode_end,
859 .decode = mss2_decode_frame,
860 .capabilities = AV_CODEC_CAP_DR1,
861 };
Modern FFMPEG