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1/*
2 * Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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
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
37typedef 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
47static 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 = (uint16_t)c->high << 8 | 0xFF;
56 c->value = (uint16_t)c->value << 8 | bytestream2_get_byte(c->gbc.gB);
57 c->low = (uint16_t)c->low << 8;
58 }
59}
60
61ARITH_GET_BIT(arith2)
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
66static 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
76static 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
94static 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
114static 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
134ARITH_GET_MODEL_SYM(arith2)
135
136static 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
150static 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
160static 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
177static 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 if (repeat >= (INT_MAX >> 8) - 1) {
215 av_log(NULL, AV_LOG_ERROR, "repeat overflow\n");
216 return AVERROR_INVALIDDATA;
217 }
218 repeat = (repeat << 8) + bytestream2_get_byte(gB) + 1;
219 }
220 if (last_symbol == -2) {
221 int skip = FFMIN((unsigned)repeat, dst + w - p);
222 repeat -= skip;
223 p += skip;
224 }
225 } else
226 last_symbol = 127 - b;
227 }
228 if (last_symbol >= 0)
229 *p = last_symbol;
230 else if (last_symbol == -1 && prev_avail)
231 *p = *(p - stride);
232 } while (++p < dst + w);
233 dst += stride;
234 prev_avail = 1;
235 } while (--h);
236
237 return 0;
238}
239
240static int decode_rle(GetBitContext *gb, uint8_t *pal_dst, ptrdiff_t pal_stride,
241 uint8_t *rgb_dst, ptrdiff_t rgb_stride, uint32_t *pal,
242 int keyframe, int kf_slipt, int slice, int w, int h)
243{
244 uint8_t bits[270] = { 0 };
245 uint32_t codes[270];
246 VLC vlc;
247
248 int current_length = 0, read_codes = 0, next_code = 0, current_codes = 0;
249 int remaining_codes, surplus_codes, i;
250
251 const int alphabet_size = 270 - keyframe;
252
253 int last_symbol = 0, repeat = 0, prev_avail = 0;
254
255 if (!keyframe) {
256 int x, y, clipw, cliph;
257
258 x = get_bits(gb, 12);
259 y = get_bits(gb, 12);
260 clipw = get_bits(gb, 12) + 1;
261 cliph = get_bits(gb, 12) + 1;
262
263 if (x + clipw > w || y + cliph > h)
264 return AVERROR_INVALIDDATA;
265 pal_dst += pal_stride * y + x;
266 rgb_dst += rgb_stride * y + x * 3;
267 w = clipw;
268 h = cliph;
269 if (y)
270 prev_avail = 1;
271 } else {
272 if (slice > 0) {
273 pal_dst += pal_stride * kf_slipt;
274 rgb_dst += rgb_stride * kf_slipt;
275 prev_avail = 1;
276 h -= kf_slipt;
277 } else
278 h = kf_slipt;
279 }
280
281 /* read explicit codes */
282 do {
283 while (current_codes--) {
284 int symbol = get_bits(gb, 8);
285 if (symbol >= 204 - keyframe)
286 symbol += 14 - keyframe;
287 else if (symbol > 189)
288 symbol = get_bits1(gb) + (symbol << 1) - 190;
289 if (bits[symbol])
290 return AVERROR_INVALIDDATA;
291 bits[symbol] = current_length;
292 codes[symbol] = next_code++;
293 read_codes++;
294 }
295 current_length++;
296 next_code <<= 1;
297 remaining_codes = (1 << current_length) - next_code;
298 current_codes = get_bits(gb, av_ceil_log2(remaining_codes + 1));
299 if (current_length > 22 || current_codes > remaining_codes)
300 return AVERROR_INVALIDDATA;
301 } while (current_codes != remaining_codes);
302
303 remaining_codes = alphabet_size - read_codes;
304
305 /* determine the minimum length to fit the rest of the alphabet */
306 while ((surplus_codes = (2 << current_length) -
307 (next_code << 1) - remaining_codes) < 0) {
308 current_length++;
309 next_code <<= 1;
310 }
311
312 /* add the rest of the symbols lexicographically */
313 for (i = 0; i < alphabet_size; i++)
314 if (!bits[i]) {
315 if (surplus_codes-- == 0) {
316 current_length++;
317 next_code <<= 1;
318 }
319 bits[i] = current_length;
320 codes[i] = next_code++;
321 }
322
323 if (next_code != 1 << current_length)
324 return AVERROR_INVALIDDATA;
325
326 if ((i = init_vlc(&vlc, 9, alphabet_size, bits, 1, 1, codes, 4, 4, 0)) < 0)
327 return i;
328
329 /* frame decode */
330 do {
331 uint8_t *pp = pal_dst;
332 uint8_t *rp = rgb_dst;
333 do {
334 if (repeat-- < 1) {
335 int b = get_vlc2(gb, vlc.table, 9, 3);
336 if (b < 256)
337 last_symbol = b;
338 else if (b < 268) {
339 b -= 256;
340 if (b == 11)
341 b = get_bits(gb, 4) + 10;
342
343 if (!b)
344 repeat = 0;
345 else
346 repeat = get_bits(gb, b);
347
348 repeat += (1 << b) - 1;
349
350 if (last_symbol == -2) {
351 int skip = FFMIN(repeat, pal_dst + w - pp);
352 repeat -= skip;
353 pp += skip;
354 rp += skip * 3;
355 }
356 } else
357 last_symbol = 267 - b;
358 }
359 if (last_symbol >= 0) {
360 *pp = last_symbol;
361 AV_WB24(rp, pal[last_symbol]);
362 } else if (last_symbol == -1 && prev_avail) {
363 *pp = *(pp - pal_stride);
364 memcpy(rp, rp - rgb_stride, 3);
365 }
366 rp += 3;
367 } while (++pp < pal_dst + w);
368 pal_dst += pal_stride;
369 rgb_dst += rgb_stride;
370 prev_avail = 1;
371 } while (--h);
372
373 ff_free_vlc(&vlc);
374 return 0;
375}
376
377static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size,
378 int x, int y, int w, int h, int wmv9_mask)
379{
380 MSS2Context *ctx = avctx->priv_data;
381 MSS12Context *c = &ctx->c;
382 VC1Context *v = avctx->priv_data;
383 MpegEncContext *s = &v->s;
384 AVFrame *f;
385 int ret;
386
387 ff_mpeg_flush(avctx);
388
389 if ((ret = init_get_bits8(&s->gb, buf, buf_size)) < 0)
390 return ret;
391
392 s->loop_filter = avctx->skip_loop_filter < AVDISCARD_ALL;
393
394 if (ff_vc1_parse_frame_header(v, &s->gb) < 0) {
395 av_log(v->s.avctx, AV_LOG_ERROR, "header error\n");
396 return AVERROR_INVALIDDATA;
397 }
398
399 if (s->pict_type != AV_PICTURE_TYPE_I) {
400 av_log(v->s.avctx, AV_LOG_ERROR, "expected I-frame\n");
401 return AVERROR_INVALIDDATA;
402 }
403
404 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
405
406 if ((ret = ff_mpv_frame_start(s, avctx)) < 0) {
407 av_log(v->s.avctx, AV_LOG_ERROR, "ff_mpv_frame_start error\n");
408 avctx->pix_fmt = AV_PIX_FMT_RGB24;
409 return ret;
410 }
411
412 ff_mpeg_er_frame_start(s);
413
414 v->bits = buf_size * 8;
415
416 v->end_mb_x = (w + 15) >> 4;
417 s->end_mb_y = (h + 15) >> 4;
418 if (v->respic & 1)
419 v->end_mb_x = v->end_mb_x + 1 >> 1;
420 if (v->respic & 2)
421 s->end_mb_y = s->end_mb_y + 1 >> 1;
422
423 ff_vc1_decode_blocks(v);
424
425 if (v->end_mb_x == s->mb_width && s->end_mb_y == s->mb_height) {
426 ff_er_frame_end(&s->er);
427 } else {
428 av_log(v->s.avctx, AV_LOG_WARNING,
429 "disabling error correction due to block count mismatch %dx%d != %dx%d\n",
430 v->end_mb_x, s->end_mb_y, s->mb_width, s->mb_height);
431 }
432
433 ff_mpv_frame_end(s);
434
435 f = s->current_picture.f;
436
437 if (v->respic == 3) {
438 ctx->dsp.upsample_plane(f->data[0], f->linesize[0], w, h);
439 ctx->dsp.upsample_plane(f->data[1], f->linesize[1], w+1 >> 1, h+1 >> 1);
440 ctx->dsp.upsample_plane(f->data[2], f->linesize[2], w+1 >> 1, h+1 >> 1);
441 } else if (v->respic)
442 avpriv_request_sample(v->s.avctx,
443 "Asymmetric WMV9 rectangle subsampling");
444
445 av_assert0(f->linesize[1] == f->linesize[2]);
446
447 if (wmv9_mask != -1)
448 ctx->dsp.mss2_blit_wmv9_masked(c->rgb_pic + y * c->rgb_stride + x * 3,
449 c->rgb_stride, wmv9_mask,
450 c->pal_pic + y * c->pal_stride + x,
451 c->pal_stride,
452 f->data[0], f->linesize[0],
453 f->data[1], f->data[2], f->linesize[1],
454 w, h);
455 else
456 ctx->dsp.mss2_blit_wmv9(c->rgb_pic + y * c->rgb_stride + x * 3,
457 c->rgb_stride,
458 f->data[0], f->linesize[0],
459 f->data[1], f->data[2], f->linesize[1],
460 w, h);
461
462 avctx->pix_fmt = AV_PIX_FMT_RGB24;
463
464 return 0;
465}
466
467typedef struct Rectangle {
468 int coded, x, y, w, h;
469} Rectangle;
470
471#define MAX_WMV9_RECTANGLES 20
472#define ARITH2_PADDING 2
473
474static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
475 AVPacket *avpkt)
476{
477 const uint8_t *buf = avpkt->data;
478 int buf_size = avpkt->size;
479 MSS2Context *ctx = avctx->priv_data;
480 MSS12Context *c = &ctx->c;
481 AVFrame *frame = data;
482 GetBitContext gb;
483 GetByteContext gB;
484 ArithCoder acoder;
485
486 int keyframe, has_wmv9, has_mv, is_rle, is_555, ret;
487
488 Rectangle wmv9rects[MAX_WMV9_RECTANGLES], *r;
489 int used_rects = 0, i, implicit_rect = 0, av_uninit(wmv9_mask);
490
491 if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
492 return ret;
493
494 if (keyframe = get_bits1(&gb))
495 skip_bits(&gb, 7);
496 has_wmv9 = get_bits1(&gb);
497 has_mv = keyframe ? 0 : get_bits1(&gb);
498 is_rle = get_bits1(&gb);
499 is_555 = is_rle && get_bits1(&gb);
500 if (c->slice_split > 0)
501 ctx->split_position = c->slice_split;
502 else if (c->slice_split < 0) {
503 if (get_bits1(&gb)) {
504 if (get_bits1(&gb)) {
505 if (get_bits1(&gb))
506 ctx->split_position = get_bits(&gb, 16);
507 else
508 ctx->split_position = get_bits(&gb, 12);
509 } else
510 ctx->split_position = get_bits(&gb, 8) << 4;
511 } else {
512 if (keyframe)
513 ctx->split_position = avctx->height / 2;
514 }
515 } else
516 ctx->split_position = avctx->height;
517
518 if (c->slice_split && (ctx->split_position < 1 - is_555 ||
519 ctx->split_position > avctx->height - 1))
520 return AVERROR_INVALIDDATA;
521
522 align_get_bits(&gb);
523 buf += get_bits_count(&gb) >> 3;
524 buf_size -= get_bits_count(&gb) >> 3;
525
526 if (buf_size < 1)
527 return AVERROR_INVALIDDATA;
528
529 if (is_555 && (has_wmv9 || has_mv || c->slice_split && ctx->split_position))
530 return AVERROR_INVALIDDATA;
531
532 avctx->pix_fmt = is_555 ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_RGB24;
533 if (ctx->last_pic->format != avctx->pix_fmt)
534 av_frame_unref(ctx->last_pic);
535
536 if (has_wmv9) {
537 bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
538 arith2_init(&acoder, &gB);
539
540 implicit_rect = !arith2_get_bit(&acoder);
541
542 while (arith2_get_bit(&acoder)) {
543 if (used_rects == MAX_WMV9_RECTANGLES)
544 return AVERROR_INVALIDDATA;
545 r = &wmv9rects[used_rects];
546 if (!used_rects)
547 r->x = arith2_get_number(&acoder, avctx->width);
548 else
549 r->x = arith2_get_number(&acoder, avctx->width -
550 wmv9rects[used_rects - 1].x) +
551 wmv9rects[used_rects - 1].x;
552 r->y = arith2_get_number(&acoder, avctx->height);
553 r->w = arith2_get_number(&acoder, avctx->width - r->x) + 1;
554 r->h = arith2_get_number(&acoder, avctx->height - r->y) + 1;
555 used_rects++;
556 }
557
558 if (implicit_rect && used_rects) {
559 av_log(avctx, AV_LOG_ERROR, "implicit_rect && used_rects > 0\n");
560 return AVERROR_INVALIDDATA;
561 }
562
563 if (implicit_rect) {
564 wmv9rects[0].x = 0;
565 wmv9rects[0].y = 0;
566 wmv9rects[0].w = avctx->width;
567 wmv9rects[0].h = avctx->height;
568
569 used_rects = 1;
570 }
571 for (i = 0; i < used_rects; i++) {
572 if (!implicit_rect && arith2_get_bit(&acoder)) {
573 av_log(avctx, AV_LOG_ERROR, "Unexpected grandchildren\n");
574 return AVERROR_INVALIDDATA;
575 }
576 if (!i) {
577 wmv9_mask = arith2_get_bit(&acoder) - 1;
578 if (!wmv9_mask)
579 wmv9_mask = arith2_get_number(&acoder, 256);
580 }
581 wmv9rects[i].coded = arith2_get_number(&acoder, 2);
582 }
583
584 buf += arith2_get_consumed_bytes(&acoder);
585 buf_size -= arith2_get_consumed_bytes(&acoder);
586 if (buf_size < 1)
587 return AVERROR_INVALIDDATA;
588 }
589
590 c->mvX = c->mvY = 0;
591 if (keyframe && !is_555) {
592 if ((i = decode_pal_v2(c, buf, buf_size)) < 0)
593 return AVERROR_INVALIDDATA;
594 buf += i;
595 buf_size -= i;
596 } else if (has_mv) {
597 buf += 4;
598 buf_size -= 4;
599 if (buf_size < 1)
600 return AVERROR_INVALIDDATA;
601 c->mvX = AV_RB16(buf - 4) - avctx->width;
602 c->mvY = AV_RB16(buf - 2) - avctx->height;
603 }
604
605 if (c->mvX < 0 || c->mvY < 0) {
606 FFSWAP(uint8_t *, c->pal_pic, c->last_pal_pic);
607
608 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
609 return ret;
610
611 if (ctx->last_pic->data[0]) {
612 av_assert0(frame->linesize[0] == ctx->last_pic->linesize[0]);
613 c->last_rgb_pic = ctx->last_pic->data[0] +
614 ctx->last_pic->linesize[0] * (avctx->height - 1);
615 } else {
616 av_log(avctx, AV_LOG_ERROR, "Missing keyframe\n");
617 return AVERROR_INVALIDDATA;
618 }
619 } else {
620 if ((ret = ff_reget_buffer(avctx, ctx->last_pic)) < 0)
621 return ret;
622 if ((ret = av_frame_ref(frame, ctx->last_pic)) < 0)
623 return ret;
624
625 c->last_rgb_pic = NULL;
626 }
627 c->rgb_pic = frame->data[0] +
628 frame->linesize[0] * (avctx->height - 1);
629 c->rgb_stride = -frame->linesize[0];
630
631 frame->key_frame = keyframe;
632 frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
633
634 if (is_555) {
635 bytestream2_init(&gB, buf, buf_size);
636
637 if (decode_555(&gB, (uint16_t *)c->rgb_pic, c->rgb_stride >> 1,
638 keyframe, avctx->width, avctx->height))
639 return AVERROR_INVALIDDATA;
640
641 buf_size -= bytestream2_tell(&gB);
642 } else {
643 if (keyframe) {
644 c->corrupted = 0;
645 ff_mss12_slicecontext_reset(&ctx->sc[0]);
646 if (c->slice_split)
647 ff_mss12_slicecontext_reset(&ctx->sc[1]);
648 }
649 if (is_rle) {
650 if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
651 return ret;
652 if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
653 c->rgb_pic, c->rgb_stride, c->pal, keyframe,
654 ctx->split_position, 0,
655 avctx->width, avctx->height))
656 return ret;
657 align_get_bits(&gb);
658
659 if (c->slice_split)
660 if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
661 c->rgb_pic, c->rgb_stride, c->pal, keyframe,
662 ctx->split_position, 1,
663 avctx->width, avctx->height))
664 return ret;
665
666 align_get_bits(&gb);
667 buf += get_bits_count(&gb) >> 3;
668 buf_size -= get_bits_count(&gb) >> 3;
669 } else if (!implicit_rect || wmv9_mask != -1) {
670 if (c->corrupted)
671 return AVERROR_INVALIDDATA;
672 bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
673 arith2_init(&acoder, &gB);
674 c->keyframe = keyframe;
675 if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[0], &acoder, 0, 0,
676 avctx->width,
677 ctx->split_position))
678 return AVERROR_INVALIDDATA;
679
680 buf += arith2_get_consumed_bytes(&acoder);
681 buf_size -= arith2_get_consumed_bytes(&acoder);
682 if (c->slice_split) {
683 if (buf_size < 1)
684 return AVERROR_INVALIDDATA;
685 bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
686 arith2_init(&acoder, &gB);
687 if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[1], &acoder, 0,
688 ctx->split_position,
689 avctx->width,
690 avctx->height - ctx->split_position))
691 return AVERROR_INVALIDDATA;
692
693 buf += arith2_get_consumed_bytes(&acoder);
694 buf_size -= arith2_get_consumed_bytes(&acoder);
695 }
696 } else
697 memset(c->pal_pic, 0, c->pal_stride * avctx->height);
698 }
699
700 if (has_wmv9) {
701 for (i = 0; i < used_rects; i++) {
702 int x = wmv9rects[i].x;
703 int y = wmv9rects[i].y;
704 int w = wmv9rects[i].w;
705 int h = wmv9rects[i].h;
706 if (wmv9rects[i].coded) {
707 int WMV9codedFrameSize;
708 if (buf_size < 4 || !(WMV9codedFrameSize = AV_RL24(buf)))
709 return AVERROR_INVALIDDATA;
710 if (ret = decode_wmv9(avctx, buf + 3, buf_size - 3,
711 x, y, w, h, wmv9_mask))
712 return ret;
713 buf += WMV9codedFrameSize + 3;
714 buf_size -= WMV9codedFrameSize + 3;
715 } else {
716 uint8_t *dst = c->rgb_pic + y * c->rgb_stride + x * 3;
717 if (wmv9_mask != -1) {
718 ctx->dsp.mss2_gray_fill_masked(dst, c->rgb_stride,
719 wmv9_mask,
720 c->pal_pic + y * c->pal_stride + x,
721 c->pal_stride,
722 w, h);
723 } else {
724 do {
725 memset(dst, 0x80, w * 3);
726 dst += c->rgb_stride;
727 } while (--h);
728 }
729 }
730 }
731 }
732
733 if (buf_size)
734 av_log(avctx, AV_LOG_WARNING, "buffer not fully consumed\n");
735
736 if (c->mvX < 0 || c->mvY < 0) {
737 av_frame_unref(ctx->last_pic);
738 ret = av_frame_ref(ctx->last_pic, frame);
739 if (ret < 0)
740 return ret;
741 }
742
743 *got_frame = 1;
744
745 return avpkt->size;
746}
747
748static av_cold int wmv9_init(AVCodecContext *avctx)
749{
750 VC1Context *v = avctx->priv_data;
751 int ret;
752
753 v->s.avctx = avctx;
754
755 if ((ret = ff_vc1_init_common(v)) < 0)
756 return ret;
757 ff_vc1dsp_init(&v->vc1dsp);
758
759 v->profile = PROFILE_MAIN;
760
761 v->zz_8x4 = ff_wmv2_scantableA;
762 v->zz_4x8 = ff_wmv2_scantableB;
763 v->res_y411 = 0;
764 v->res_sprite = 0;
765
766 v->frmrtq_postproc = 7;
767 v->bitrtq_postproc = 31;
768
769 v->res_x8 = 0;
770 v->multires = 0;
771 v->res_fasttx = 1;
772
773 v->fastuvmc = 0;
774
775 v->extended_mv = 0;
776
777 v->dquant = 1;
778 v->vstransform = 1;
779
780 v->res_transtab = 0;
781
782 v->overlap = 0;
783
784 v->resync_marker = 0;
785 v->rangered = 0;
786
787 v->s.max_b_frames = avctx->max_b_frames = 0;
788 v->quantizer_mode = 0;
789
790 v->finterpflag = 0;
791
792 v->res_rtm_flag = 1;
793
794 ff_vc1_init_transposed_scantables(v);
795
796 if ((ret = ff_msmpeg4_decode_init(avctx)) < 0 ||
797 (ret = ff_vc1_decode_init_alloc_tables(v)) < 0)
798 return ret;
799
800 /* error concealment */
801 v->s.me.qpel_put = v->s.qdsp.put_qpel_pixels_tab;
802 v->s.me.qpel_avg = v->s.qdsp.avg_qpel_pixels_tab;
803
804 return 0;
805}
806
807static av_cold int mss2_decode_end(AVCodecContext *avctx)
808{
809 MSS2Context *const ctx = avctx->priv_data;
810
811 av_frame_free(&ctx->last_pic);
812
813 ff_mss12_decode_end(&ctx->c);
814 av_freep(&ctx->c.pal_pic);
815 av_freep(&ctx->c.last_pal_pic);
816 ff_vc1_decode_end(avctx);
817
818 return 0;
819}
820
821static av_cold int mss2_decode_init(AVCodecContext *avctx)
822{
823 MSS2Context * const ctx = avctx->priv_data;
824 MSS12Context *c = &ctx->c;
825 int ret;
826 c->avctx = avctx;
827 if (ret = ff_mss12_decode_init(c, 1, &ctx->sc[0], &ctx->sc[1]))
828 return ret;
829 ctx->last_pic = av_frame_alloc();
830 c->pal_stride = c->mask_stride;
831 c->pal_pic = av_mallocz(c->pal_stride * avctx->height);
832 c->last_pal_pic = av_mallocz(c->pal_stride * avctx->height);
833 if (!c->pal_pic || !c->last_pal_pic || !ctx->last_pic) {
834 mss2_decode_end(avctx);
835 return AVERROR(ENOMEM);
836 }
837 if (ret = wmv9_init(avctx)) {
838 mss2_decode_end(avctx);
839 return ret;
840 }
841 ff_mss2dsp_init(&ctx->dsp);
842 ff_qpeldsp_init(&ctx->qdsp);
843
844 avctx->pix_fmt = c->free_colours == 127 ? AV_PIX_FMT_RGB555
845 : AV_PIX_FMT_RGB24;
846
847
848 return 0;
849}
850
851AVCodec 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};
862
generated by cgit at 2024-05-17 05:11:59 (GMT)