Libav
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 
26 #include "libavutil/avassert.h"
27 #include "error_resilience.h"
28 #include "internal.h"
29 #include "msmpeg4data.h"
30 #include "vc1.h"
31 #include "mss12.h"
32 #include "mss2dsp.h"
33 
34 typedef struct MSS2Context {
41 } MSS2Context;
42 
44 {
45  while ((c->high >> 15) - (c->low >> 15) < 2) {
46  if ((c->low ^ c->high) & 0x10000) {
47  c->high ^= 0x8000;
48  c->value ^= 0x8000;
49  c->low ^= 0x8000;
50  }
51  c->high = c->high << 8 & 0xFFFFFF | 0xFF;
52  c->value = c->value << 8 & 0xFFFFFF | bytestream2_get_byte(c->gbc.gB);
53  c->low = c->low << 8 & 0xFFFFFF;
54  }
55 }
56 
58 
59 /* L. Stuiver and A. Moffat: "Piecewise Integer Mapping for Arithmetic Coding."
60  * In Proc. 8th Data Compression Conference (DCC '98), pp. 3-12, Mar. 1998 */
61 
62 static int arith2_get_scaled_value(int value, int n, int range)
63 {
64  int split = (n << 1) - range;
65 
66  if (value > split)
67  return split + (value - split >> 1);
68  else
69  return value;
70 }
71 
72 static void arith2_rescale_interval(ArithCoder *c, int range,
73  int low, int high, int n)
74 {
75  int split = (n << 1) - range;
76 
77  if (high > split)
78  c->high = split + (high - split << 1);
79  else
80  c->high = high;
81 
82  c->high += c->low - 1;
83 
84  if (low > split)
85  c->low += split + (low - split << 1);
86  else
87  c->low += low;
88 }
89 
90 static int arith2_get_number(ArithCoder *c, int n)
91 {
92  int range = c->high - c->low + 1;
93  int scale = av_log2(range) - av_log2(n);
94  int val;
95 
96  if (n << scale > range)
97  scale--;
98 
99  n <<= scale;
100 
101  val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
102 
103  arith2_rescale_interval(c, range, val << scale, (val + 1) << scale, n);
104 
105  arith2_normalise(c);
106 
107  return val;
108 }
109 
110 static int arith2_get_prob(ArithCoder *c, int16_t *probs)
111 {
112  int range = c->high - c->low + 1, n = *probs;
113  int scale = av_log2(range) - av_log2(n);
114  int i = 0, val;
115 
116  if (n << scale > range)
117  scale--;
118 
119  n <<= scale;
120 
121  val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
122  while (probs[++i] > val) ;
123 
124  arith2_rescale_interval(c, range,
125  probs[i] << scale, probs[i - 1] << scale, n);
126 
127  return i;
128 }
129 
131 
133 {
134  int diff = (c->high >> 16) - (c->low >> 16);
135  int bp = bytestream2_tell(c->gbc.gB) - 3 << 3;
136  int bits = 1;
137 
138  while (!(diff & 0x80)) {
139  bits++;
140  diff <<= 1;
141  }
142 
143  return (bits + bp + 7 >> 3) + ((c->low >> 16) + 1 == c->high >> 16);
144 }
145 
147 {
148  c->low = 0;
149  c->high = 0xFFFFFF;
150  c->value = bytestream2_get_be24(gB);
151  c->gbc.gB = gB;
152  c->get_model_sym = arith2_get_model_sym;
154 }
155 
156 static int decode_pal_v2(MSS12Context *ctx, const uint8_t *buf, int buf_size)
157 {
158  int i, ncol;
159  uint32_t *pal = ctx->pal + 256 - ctx->free_colours;
160 
161  if (!ctx->free_colours)
162  return 0;
163 
164  ncol = *buf++;
165  if (ncol > ctx->free_colours || buf_size < 2 + ncol * 3)
166  return AVERROR_INVALIDDATA;
167  for (i = 0; i < ncol; i++)
168  *pal++ = AV_RB24(buf + 3 * i);
169 
170  return 1 + ncol * 3;
171 }
172 
173 static int decode_555(GetByteContext *gB, uint16_t *dst, int stride,
174  int keyframe, int w, int h)
175 {
176  int last_symbol = 0, repeat = 0, prev_avail = 0;
177 
178  if (!keyframe) {
179  int x, y, endx, endy, t;
180 
181 #define READ_PAIR(a, b) \
182  a = bytestream2_get_byte(gB) << 4; \
183  t = bytestream2_get_byte(gB); \
184  a |= t >> 4; \
185  b = (t & 0xF) << 8; \
186  b |= bytestream2_get_byte(gB); \
187 
188  READ_PAIR(x, endx)
189  READ_PAIR(y, endy)
190 
191  if (endx >= w || endy >= h || x > endx || y > endy)
192  return AVERROR_INVALIDDATA;
193  dst += x + stride * y;
194  w = endx - x + 1;
195  h = endy - y + 1;
196  if (y)
197  prev_avail = 1;
198  }
199 
200  do {
201  uint16_t *p = dst;
202  do {
203  if (repeat-- < 1) {
204  int b = bytestream2_get_byte(gB);
205  if (b < 128)
206  last_symbol = b << 8 | bytestream2_get_byte(gB);
207  else if (b > 129) {
208  repeat = 0;
209  while (b-- > 130)
210  repeat = (repeat << 8) + bytestream2_get_byte(gB) + 1;
211  if (last_symbol == -2) {
212  int skip = FFMIN((unsigned)repeat, dst + w - p);
213  repeat -= skip;
214  p += skip;
215  }
216  } else
217  last_symbol = 127 - b;
218  }
219  if (last_symbol >= 0)
220  *p = last_symbol;
221  else if (last_symbol == -1 && prev_avail)
222  *p = *(p - stride);
223  } while (++p < dst + w);
224  dst += stride;
225  prev_avail = 1;
226  } while (--h);
227 
228  return 0;
229 }
230 
231 static int decode_rle(GetBitContext *gb, uint8_t *pal_dst, int pal_stride,
232  uint8_t *rgb_dst, int rgb_stride, uint32_t *pal,
233  int keyframe, int kf_slipt, int slice, int w, int h)
234 {
235  uint8_t bits[270] = { 0 };
236  uint32_t codes[270];
237  VLC vlc;
238 
239  int current_length = 0, read_codes = 0, next_code = 0, current_codes = 0;
240  int remaining_codes, surplus_codes, i;
241 
242  const int alphabet_size = 270 - keyframe;
243 
244  int last_symbol = 0, repeat = 0, prev_avail = 0;
245 
246  if (!keyframe) {
247  int x, y, clipw, cliph;
248 
249  x = get_bits(gb, 12);
250  y = get_bits(gb, 12);
251  clipw = get_bits(gb, 12) + 1;
252  cliph = get_bits(gb, 12) + 1;
253 
254  if (x + clipw > w || y + cliph > h)
255  return AVERROR_INVALIDDATA;
256  pal_dst += pal_stride * y + x;
257  rgb_dst += rgb_stride * y + x * 3;
258  w = clipw;
259  h = cliph;
260  if (y)
261  prev_avail = 1;
262  } else {
263  if (slice > 0) {
264  pal_dst += pal_stride * kf_slipt;
265  rgb_dst += rgb_stride * kf_slipt;
266  prev_avail = 1;
267  h -= kf_slipt;
268  } else
269  h = kf_slipt;
270  }
271 
272  /* read explicit codes */
273  do {
274  while (current_codes--) {
275  int symbol = get_bits(gb, 8);
276  if (symbol >= 204 - keyframe)
277  symbol += 14 - keyframe;
278  else if (symbol > 189)
279  symbol = get_bits1(gb) + (symbol << 1) - 190;
280  if (bits[symbol])
281  return AVERROR_INVALIDDATA;
282  bits[symbol] = current_length;
283  codes[symbol] = next_code++;
284  read_codes++;
285  }
286  current_length++;
287  next_code <<= 1;
288  remaining_codes = (1 << current_length) - next_code;
289  current_codes = get_bits(gb, av_ceil_log2(remaining_codes + 1));
290  if (current_length > 22 || current_codes > remaining_codes)
291  return AVERROR_INVALIDDATA;
292  } while (current_codes != remaining_codes);
293 
294  remaining_codes = alphabet_size - read_codes;
295 
296  /* determine the minimum length to fit the rest of the alphabet */
297  while ((surplus_codes = (2 << current_length) -
298  (next_code << 1) - remaining_codes) < 0) {
299  current_length++;
300  next_code <<= 1;
301  }
302 
303  /* add the rest of the symbols lexicographically */
304  for (i = 0; i < alphabet_size; i++)
305  if (!bits[i]) {
306  if (surplus_codes-- == 0) {
307  current_length++;
308  next_code <<= 1;
309  }
310  bits[i] = current_length;
311  codes[i] = next_code++;
312  }
313 
314  if (next_code != 1 << current_length)
315  return AVERROR_INVALIDDATA;
316 
317  if (i = init_vlc(&vlc, 9, alphabet_size, bits, 1, 1, codes, 4, 4, 0))
318  return i;
319 
320  /* frame decode */
321  do {
322  uint8_t *pp = pal_dst;
323  uint8_t *rp = rgb_dst;
324  do {
325  if (repeat-- < 1) {
326  int b = get_vlc2(gb, vlc.table, 9, 3);
327  if (b < 256)
328  last_symbol = b;
329  else if (b < 268) {
330  b -= 256;
331  if (b == 11)
332  b = get_bits(gb, 4) + 10;
333 
334  if (!b)
335  repeat = 0;
336  else
337  repeat = get_bits(gb, b);
338 
339  repeat += (1 << b) - 1;
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 
368 static 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  int ret;
377 
378  ff_mpeg_flush(avctx);
379 
380  init_get_bits(&s->gb, buf, buf_size * 8);
381 
383 
384  if (ff_vc1_parse_frame_header(v, &s->gb) < 0) {
385  av_log(v->s.avctx, AV_LOG_ERROR, "header error\n");
386  return AVERROR_INVALIDDATA;
387  }
388 
389  if (s->pict_type != AV_PICTURE_TYPE_I) {
390  av_log(v->s.avctx, AV_LOG_ERROR, "expected I-frame\n");
391  return AVERROR_INVALIDDATA;
392  }
393 
394  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
395 
396  if ((ret = ff_MPV_frame_start(s, avctx)) < 0) {
397  av_log(v->s.avctx, AV_LOG_ERROR, "ff_MPV_frame_start error\n");
398  avctx->pix_fmt = AV_PIX_FMT_RGB24;
399  return ret;
400  }
401 
403 
404  v->bits = buf_size * 8;
405 
406  v->end_mb_x = (w + 15) >> 4;
407  s->end_mb_y = (h + 15) >> 4;
408  if (v->respic & 1)
409  v->end_mb_x = v->end_mb_x + 1 >> 1;
410  if (v->respic & 2)
411  s->end_mb_y = s->end_mb_y + 1 >> 1;
412 
414 
415  ff_er_frame_end(&s->er);
416 
417  ff_MPV_frame_end(s);
418 
419  f = &s->current_picture.f;
420 
421  if (v->respic == 3) {
422  ctx->dsp.upsample_plane(f->data[0], f->linesize[0], w, h);
423  ctx->dsp.upsample_plane(f->data[1], f->linesize[1], w >> 1, h >> 1);
424  ctx->dsp.upsample_plane(f->data[2], f->linesize[2], w >> 1, h >> 1);
425  } else if (v->respic)
427  "Asymmetric WMV9 rectangle subsampling");
428 
429  av_assert0(f->linesize[1] == f->linesize[2]);
430 
431  if (wmv9_mask != -1)
432  ctx->dsp.mss2_blit_wmv9_masked(c->rgb_pic + y * c->rgb_stride + x * 3,
433  c->rgb_stride, wmv9_mask,
434  c->pal_pic + y * c->pal_stride + x,
435  c->pal_stride,
436  f->data[0], f->linesize[0],
437  f->data[1], f->data[2], f->linesize[1],
438  w, h);
439  else
440  ctx->dsp.mss2_blit_wmv9(c->rgb_pic + y * c->rgb_stride + x * 3,
441  c->rgb_stride,
442  f->data[0], f->linesize[0],
443  f->data[1], f->data[2], f->linesize[1],
444  w, h);
445 
446  avctx->pix_fmt = AV_PIX_FMT_RGB24;
447 
448  return 0;
449 }
450 
451 typedef struct Rectangle {
452  int coded, x, y, w, h;
453 } Rectangle;
454 
455 #define MAX_WMV9_RECTANGLES 20
456 #define ARITH2_PADDING 2
457 
458 static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
459  AVPacket *avpkt)
460 {
461  const uint8_t *buf = avpkt->data;
462  int buf_size = avpkt->size;
463  MSS2Context *ctx = avctx->priv_data;
464  MSS12Context *c = &ctx->c;
465  AVFrame *frame = data;
466  GetBitContext gb;
467  GetByteContext gB;
468  ArithCoder acoder;
469 
470  int keyframe, has_wmv9, has_mv, is_rle, is_555, ret;
471 
472  Rectangle wmv9rects[MAX_WMV9_RECTANGLES], *r;
473  int used_rects = 0, i, implicit_rect = 0, av_uninit(wmv9_mask);
474 
476  ARITH2_PADDING + (MIN_CACHE_BITS + 7) / 8);
477 
478  init_get_bits(&gb, buf, buf_size * 8);
479 
480  if (keyframe = get_bits1(&gb))
481  skip_bits(&gb, 7);
482  has_wmv9 = get_bits1(&gb);
483  has_mv = keyframe ? 0 : get_bits1(&gb);
484  is_rle = get_bits1(&gb);
485  is_555 = is_rle && get_bits1(&gb);
486  if (c->slice_split > 0)
487  ctx->split_position = c->slice_split;
488  else if (c->slice_split < 0) {
489  if (get_bits1(&gb)) {
490  if (get_bits1(&gb)) {
491  if (get_bits1(&gb))
492  ctx->split_position = get_bits(&gb, 16);
493  else
494  ctx->split_position = get_bits(&gb, 12);
495  } else
496  ctx->split_position = get_bits(&gb, 8) << 4;
497  } else {
498  if (keyframe)
499  ctx->split_position = avctx->height / 2;
500  }
501  } else
502  ctx->split_position = avctx->height;
503 
504  if (c->slice_split && (ctx->split_position < 1 - is_555 ||
505  ctx->split_position > avctx->height - 1))
506  return AVERROR_INVALIDDATA;
507 
508  align_get_bits(&gb);
509  buf += get_bits_count(&gb) >> 3;
510  buf_size -= get_bits_count(&gb) >> 3;
511 
512  if (buf_size < 1)
513  return AVERROR_INVALIDDATA;
514 
515  if (is_555 && (has_wmv9 || has_mv || c->slice_split && ctx->split_position))
516  return AVERROR_INVALIDDATA;
517 
518  avctx->pix_fmt = is_555 ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_RGB24;
519  if (ctx->last_pic->format != avctx->pix_fmt)
520  av_frame_unref(ctx->last_pic);
521 
522  if (has_wmv9) {
523  bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
524  arith2_init(&acoder, &gB);
525 
526  implicit_rect = !arith2_get_bit(&acoder);
527 
528  while (arith2_get_bit(&acoder)) {
529  if (used_rects == MAX_WMV9_RECTANGLES)
530  return AVERROR_INVALIDDATA;
531  r = &wmv9rects[used_rects];
532  if (!used_rects)
533  r->x = arith2_get_number(&acoder, avctx->width);
534  else
535  r->x = arith2_get_number(&acoder, avctx->width -
536  wmv9rects[used_rects - 1].x) +
537  wmv9rects[used_rects - 1].x;
538  r->y = arith2_get_number(&acoder, avctx->height);
539  r->w = arith2_get_number(&acoder, avctx->width - r->x) + 1;
540  r->h = arith2_get_number(&acoder, avctx->height - r->y) + 1;
541  used_rects++;
542  }
543 
544  if (implicit_rect && used_rects) {
545  av_log(avctx, AV_LOG_ERROR, "implicit_rect && used_rects > 0\n");
546  return AVERROR_INVALIDDATA;
547  }
548 
549  if (implicit_rect) {
550  wmv9rects[0].x = 0;
551  wmv9rects[0].y = 0;
552  wmv9rects[0].w = avctx->width;
553  wmv9rects[0].h = avctx->height;
554 
555  used_rects = 1;
556  }
557  for (i = 0; i < used_rects; i++) {
558  if (!implicit_rect && arith2_get_bit(&acoder)) {
559  av_log(avctx, AV_LOG_ERROR, "Unexpected grandchildren\n");
560  return AVERROR_INVALIDDATA;
561  }
562  if (!i) {
563  wmv9_mask = arith2_get_bit(&acoder) - 1;
564  if (!wmv9_mask)
565  wmv9_mask = arith2_get_number(&acoder, 256);
566  }
567  wmv9rects[i].coded = arith2_get_number(&acoder, 2);
568  }
569 
570  buf += arith2_get_consumed_bytes(&acoder);
571  buf_size -= arith2_get_consumed_bytes(&acoder);
572  if (buf_size < 1)
573  return AVERROR_INVALIDDATA;
574  }
575 
576  c->mvX = c->mvY = 0;
577  if (keyframe && !is_555) {
578  if ((i = decode_pal_v2(c, buf, buf_size)) < 0)
579  return AVERROR_INVALIDDATA;
580  buf += i;
581  buf_size -= i;
582  } else if (has_mv) {
583  buf += 4;
584  buf_size -= 4;
585  if (buf_size < 1)
586  return AVERROR_INVALIDDATA;
587  c->mvX = AV_RB16(buf - 4) - avctx->width;
588  c->mvY = AV_RB16(buf - 2) - avctx->height;
589  }
590 
591  if (c->mvX < 0 || c->mvY < 0) {
592  FFSWAP(uint8_t *, c->pal_pic, c->last_pal_pic);
593 
594  if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) {
595  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
596  return ret;
597  }
598 
599  if (ctx->last_pic->data[0]) {
600  av_assert0(frame->linesize[0] == ctx->last_pic->linesize[0]);
601  c->last_rgb_pic = ctx->last_pic->data[0] +
602  ctx->last_pic->linesize[0] * (avctx->height - 1);
603  } else {
604  av_log(avctx, AV_LOG_ERROR, "Missing keyframe\n");
605  return AVERROR_INVALIDDATA;
606  }
607  } else {
608  if ((ret = ff_reget_buffer(avctx, ctx->last_pic)) < 0) {
609  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
610  return ret;
611  }
612  if ((ret = av_frame_ref(frame, ctx->last_pic)) < 0)
613  return ret;
614 
615  c->last_rgb_pic = NULL;
616  }
617  c->rgb_pic = frame->data[0] +
618  frame->linesize[0] * (avctx->height - 1);
619  c->rgb_stride = -frame->linesize[0];
620 
621  frame->key_frame = keyframe;
622  frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
623 
624  if (is_555) {
625  bytestream2_init(&gB, buf, buf_size);
626 
627  if (decode_555(&gB, (uint16_t *)c->rgb_pic, c->rgb_stride >> 1,
628  keyframe, avctx->width, avctx->height))
629  return AVERROR_INVALIDDATA;
630 
631  buf_size -= bytestream2_tell(&gB);
632  } else {
633  if (keyframe) {
634  c->corrupted = 0;
636  if (c->slice_split)
638  }
639  if (is_rle) {
640  init_get_bits(&gb, buf, buf_size * 8);
641  if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
642  c->rgb_pic, c->rgb_stride, c->pal, keyframe,
643  ctx->split_position, 0,
644  avctx->width, avctx->height))
645  return ret;
646  align_get_bits(&gb);
647 
648  if (c->slice_split)
649  if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
650  c->rgb_pic, c->rgb_stride, c->pal, keyframe,
651  ctx->split_position, 1,
652  avctx->width, avctx->height))
653  return ret;
654 
655  align_get_bits(&gb);
656  buf += get_bits_count(&gb) >> 3;
657  buf_size -= get_bits_count(&gb) >> 3;
658  } else if (!implicit_rect || wmv9_mask != -1) {
659  if (c->corrupted)
660  return AVERROR_INVALIDDATA;
661  bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
662  arith2_init(&acoder, &gB);
663  c->keyframe = keyframe;
664  if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[0], &acoder, 0, 0,
665  avctx->width,
666  ctx->split_position))
667  return AVERROR_INVALIDDATA;
668 
669  buf += arith2_get_consumed_bytes(&acoder);
670  buf_size -= arith2_get_consumed_bytes(&acoder);
671  if (c->slice_split) {
672  if (buf_size < 1)
673  return AVERROR_INVALIDDATA;
674  bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
675  arith2_init(&acoder, &gB);
676  if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[1], &acoder, 0,
677  ctx->split_position,
678  avctx->width,
679  avctx->height - ctx->split_position))
680  return AVERROR_INVALIDDATA;
681 
682  buf += arith2_get_consumed_bytes(&acoder);
683  buf_size -= arith2_get_consumed_bytes(&acoder);
684  }
685  } else
686  memset(c->pal_pic, 0, c->pal_stride * avctx->height);
687  }
688 
689  if (has_wmv9) {
690  for (i = 0; i < used_rects; i++) {
691  int x = wmv9rects[i].x;
692  int y = wmv9rects[i].y;
693  int w = wmv9rects[i].w;
694  int h = wmv9rects[i].h;
695  if (wmv9rects[i].coded) {
696  int WMV9codedFrameSize;
697  if (buf_size < 4 || !(WMV9codedFrameSize = AV_RL24(buf)))
698  return AVERROR_INVALIDDATA;
699  if (ret = decode_wmv9(avctx, buf + 3, buf_size - 3,
700  x, y, w, h, wmv9_mask))
701  return ret;
702  buf += WMV9codedFrameSize + 3;
703  buf_size -= WMV9codedFrameSize + 3;
704  } else {
705  uint8_t *dst = c->rgb_pic + y * c->rgb_stride + x * 3;
706  if (wmv9_mask != -1) {
707  ctx->dsp.mss2_gray_fill_masked(dst, c->rgb_stride,
708  wmv9_mask,
709  c->pal_pic + y * c->pal_stride + x,
710  c->pal_stride,
711  w, h);
712  } else {
713  do {
714  memset(dst, 0x80, w * 3);
715  dst += c->rgb_stride;
716  } while (--h);
717  }
718  }
719  }
720  }
721 
722  if (buf_size)
723  av_log(avctx, AV_LOG_WARNING, "buffer not fully consumed\n");
724 
725  if (c->mvX < 0 || c->mvY < 0) {
726  av_frame_unref(ctx->last_pic);
727  ret = av_frame_ref(ctx->last_pic, frame);
728  if (ret < 0)
729  return ret;
730  }
731 
732  *got_frame = 1;
733 
734  return avpkt->size;
735 }
736 
737 static av_cold int wmv9_init(AVCodecContext *avctx)
738 {
739  VC1Context *v = avctx->priv_data;
740  int ret;
741 
742  v->s.avctx = avctx;
743 
744  if ((ret = ff_vc1_init_common(v)) < 0)
745  return ret;
746  ff_vc1dsp_init(&v->vc1dsp);
747 
748  v->profile = PROFILE_MAIN;
749 
752  v->res_y411 = 0;
753  v->res_sprite = 0;
754 
755  v->frmrtq_postproc = 7;
756  v->bitrtq_postproc = 31;
757 
758  v->res_x8 = 0;
759  v->multires = 0;
760  v->res_fasttx = 1;
761 
762  v->fastuvmc = 0;
763 
764  v->extended_mv = 0;
765 
766  v->dquant = 1;
767  v->vstransform = 1;
768 
769  v->res_transtab = 0;
770 
771  v->overlap = 0;
772 
773  v->resync_marker = 0;
774  v->rangered = 0;
775 
776  v->s.max_b_frames = avctx->max_b_frames = 0;
777  v->quantizer_mode = 0;
778 
779  v->finterpflag = 0;
780 
781  v->res_rtm_flag = 1;
782 
784 
785  if ((ret = ff_msmpeg4_decode_init(avctx)) < 0 ||
786  (ret = ff_vc1_decode_init_alloc_tables(v)) < 0)
787  return ret;
788 
789  /* error concealment */
792 
793  return 0;
794 }
795 
797 {
798  MSS2Context *const ctx = avctx->priv_data;
799 
800  av_frame_free(&ctx->last_pic);
801 
802  ff_mss12_decode_end(&ctx->c);
803  av_freep(&ctx->c.pal_pic);
804  av_freep(&ctx->c.last_pal_pic);
805  ff_vc1_decode_end(avctx);
806 
807  return 0;
808 }
809 
811 {
812  MSS2Context * const ctx = avctx->priv_data;
813  MSS12Context *c = &ctx->c;
814  int ret;
815  c->avctx = avctx;
816  if (ret = ff_mss12_decode_init(c, 1, &ctx->sc[0], &ctx->sc[1]))
817  return ret;
818  c->pal_stride = c->mask_stride;
819  c->pal_pic = av_mallocz(c->pal_stride * avctx->height);
820  c->last_pal_pic = av_mallocz(c->pal_stride * avctx->height);
821  if (!c->pal_pic || !c->last_pal_pic) {
822  mss2_decode_end(avctx);
823  return AVERROR(ENOMEM);
824  }
825  if (ret = wmv9_init(avctx)) {
826  mss2_decode_end(avctx);
827  return ret;
828  }
829  ff_mss2dsp_init(&ctx->dsp);
830 
831  avctx->pix_fmt = c->free_colours == 127 ? AV_PIX_FMT_RGB555
833 
834  ctx->last_pic = av_frame_alloc();
835  if (!ctx->last_pic) {
836  mss2_decode_end(avctx);
837  return AVERROR(ENOMEM);
838  }
839 
840  return 0;
841 }
842 
844  .name = "mss2",
845  .long_name = NULL_IF_CONFIG_SMALL("MS Windows Media Video V9 Screen"),
846  .type = AVMEDIA_TYPE_VIDEO,
847  .id = AV_CODEC_ID_MSS2,
848  .priv_data_size = sizeof(MSS2Context),
852  .capabilities = CODEC_CAP_DR1,
853 };
#define ARITH_GET_BIT(VERSION)
Definition: mss12.h:102
static av_cold int mss2_decode_init(AVCodecContext *avctx)
Definition: mss2.c:810
MSS12Context c
Definition: mss2.c:38
#define ARITH2_PADDING
Definition: mss2.c:456
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
static int arith2_get_scaled_value(int value, int n, int range)
Definition: mss2.c:62
The VC1 Context.
Definition: vc1.h:182
This structure describes decoded (raw) audio or video data.
Definition: frame.h:107
static int decode_rle(GetBitContext *gb, uint8_t *pal_dst, int pal_stride, uint8_t *rgb_dst, int rgb_stride, uint32_t *pal, int keyframe, int kf_slipt, int slice, int w, int h)
Definition: mss2.c:231
int high
Definition: mss12.h:49
av_cold int ff_mss12_decode_init(MSS12Context *c, int version, SliceContext *sc1, SliceContext *sc2)
Definition: mss12.c:562
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:240
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:129
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:67
int end_mb_y
end mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y) ...
Definition: mpegvideo.h:340
void(* mss2_gray_fill_masked)(uint8_t *dst, int dst_stride, int maskcolor, const uint8_t *mask, int mask_stride, int w, int h)
Definition: mss2dsp.h:42
int max_b_frames
maximum number of B-frames between non-B-frames Note: The output will be delayed by max_b_frames+1 re...
Definition: avcodec.h:1302
int extended_mv
Ext MV in P/B (not in Simple)
Definition: vc1.h:231
int value
Definition: mss12.h:49
void ff_er_frame_end(ERContext *s)
int corrupted
Definition: mss12.h:89
static void arith2_rescale_interval(ArithCoder *c, int range, int low, int high, int n)
Definition: mss2.c:72
int size
Definition: avcodec.h:974
void(* mss2_blit_wmv9)(uint8_t *dst, int dst_stride, const uint8_t *srcy, int srcy_stride, const uint8_t *srcu, const uint8_t *srcv, int srcuv_stride, int w, int h)
Definition: mss2dsp.h:32
#define AV_RB24
Definition: intreadwrite.h:64
int ff_msmpeg4_decode_init(AVCodecContext *avctx)
Definition: msmpeg4dec.c:281
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1247
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:130
int w
Definition: mss2.c:452
discard all
Definition: avcodec.h:546
int fastuvmc
Rounding of qpel vector to hpel ? (not in Simple)
Definition: vc1.h:230
int end_mb_x
Horizontal macroblock limit (used only by mss2)
Definition: vc1.h:401
uint8_t * rgb_pic
Definition: mss12.h:83
int mask_stride
Definition: mss12.h:82
int stride
Definition: mace.c:144
AVCodec.
Definition: avcodec.h:2755
int frmrtq_postproc
3bits,
Definition: vc1.h:228
int ff_mss12_decode_rect(SliceContext *sc, ArithCoder *acoder, int x, int y, int width, int height)
Definition: mss12.c:526
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
int bits
Definition: vc1.h:188
int slice_split
Definition: mss12.h:90
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
int res_transtab
reserved, always 0
Definition: vc1.h:197
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:269
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
uint8_t bits
Definition: crc.c:216
uint32_t pal[256]
Definition: mss12.h:77
uint8_t
uint8_t * last_pal_pic
Definition: mss12.h:79
#define av_cold
Definition: attributes.h:66
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:43
int rgb_stride
Definition: mss12.h:85
int keyframe
Definition: mss12.h:87
av_cold int ff_vc1_init_common(VC1Context *v)
Init VC-1 specific tables and VC1Context members.
Definition: vc1.c:1567
#define b
Definition: input.c:52
qpel_mc_func(* qpel_put)[16]
Definition: mpegvideo.h:251
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:174
int coded
Definition: mss2.c:452
int split_position
Definition: mss2.c:36
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:366
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:711
int profile
Sequence header data for all Profiles TODO: choose between ints, uint8_ts and monobit flags...
Definition: vc1.h:227
const char data[16]
Definition: mxf.c:66
MSMPEG4 data tables.
uint8_t * data
Definition: avcodec.h:973
GetByteContext * gB
Definition: mss12.h:52
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:194
void ff_MPV_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1843
static float t
Definition: output.c:52
int ff_vc1_decode_end(AVCodecContext *avctx)
Close a VC1/WMV3 decoder.
Definition: vc1dec.c:5715
int(* get_model_sym)(struct ArithCoder *c, Model *m)
Definition: mss12.h:54
static int arith2_get_number(ArithCoder *c, int n)
Definition: mss2.c:90
qpel_mc_func put_qpel_pixels_tab[2][16]
Definition: dsputil.h:184
int h
Definition: mss2.c:452
#define r
Definition: input.c:51
static int arith2_get_prob(ArithCoder *c, int16_t *probs)
Definition: mss2.c:110
static av_cold int wmv9_init(AVCodecContext *avctx)
Definition: mss2.c:737
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
av_cold void ff_mss2dsp_init(MSS2DSPContext *dsp)
Definition: mss2dsp.c:147
int res_y411
reserved, old interlaced mode
Definition: vc1.h:193
int overlap
overlapped transforms in use
Definition: vc1.h:234
int res_x8
reserved
Definition: vc1.h:194
static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size, int x, int y, int w, int h, int wmv9_mask)
Definition: mss2.c:368
#define AV_RB16
Definition: intreadwrite.h:53
#define AVERROR(e)
Definition: error.h:43
qpel_mc_func avg_qpel_pixels_tab[2][16]
Definition: dsputil.h:185
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:55
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:142
ERContext er
Definition: mpegvideo.h:719
int mvY
Definition: mss12.h:88
void(* upsample_plane)(uint8_t *plane, int plane_stride, int w, int h)
Definition: mss2dsp.h:45
simple assert() macros that are a bit more flexible than ISO C assert().
void ff_vc1_decode_blocks(VC1Context *v)
Definition: vc1dec.c:5179
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:148
const char * name
Name of the codec implementation.
Definition: avcodec.h:2762
GetBitContext gb
Definition: mpegvideo.h:632
int resync_marker
could this stream contain resync markers
Definition: vc1.h:404
const uint8_t * zz_8x4
Zigzag scan table for TT_8x4 coding mode.
Definition: vc1.h:249
int res_rtm_flag
reserved, set to 1
Definition: vc1.h:200
int pal_stride
Definition: mss12.h:80
const uint8_t ff_wmv2_scantableB[64]
Definition: msmpeg4data.c:1994
Definition: get_bits.h:64
static char * split(char *message, char delim)
Definition: af_channelmap.c:86
static void arith2_init(ArithCoder *c, GetByteContext *gB)
Definition: mss2.c:146
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2433
AVCodecContext * avctx
Definition: mss12.h:76
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:509
const uint8_t * zz_4x8
Zigzag scan table for TT_4x8 coding mode.
Definition: vc1.h:250
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...
Definition: utils.c:755
void ff_mpeg_er_frame_start(MpegEncContext *s)
SliceContext sc[2]
Definition: mss2.c:40
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:168
#define FFMIN(a, b)
Definition: common.h:57
int width
picture width / height.
Definition: avcodec.h:1217
#define AV_WB24(p, d)
Definition: intreadwrite.h:412
int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext *gb)
Definition: vc1.c:623
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:522
static int decode_555(GetByteContext *gB, uint16_t *dst, int stride, int keyframe, int w, int h)
Definition: mss2.c:173
MotionEstContext me
Definition: mpegvideo.h:457
int ff_MPV_frame_start(MpegEncContext *s, AVCodecContext *avctx)
generic function called after decoding the header and before a frame is decoded.
Definition: mpegvideo.c:1628
static int arith2_get_consumed_bytes(ArithCoder *c)
Definition: mss2.c:132
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:183
int rangered
RANGEREDFRM (range reduction) syntax element present at frame level.
Definition: vc1.h:198
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:158
int finterpflag
INTERPFRM present.
Definition: vc1.h:236
NULL
Definition: eval.c:55
av_cold int ff_mss12_decode_end(MSS12Context *c)
Definition: mss12.c:669
int res_sprite
Simple/Main Profile sequence header.
Definition: vc1.h:192
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:125
int multires
frame-level RESPIC syntax element present
Definition: vc1.h:195
main external API structure.
Definition: avcodec.h:1054
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:489
const uint8_t ff_wmv2_scantableA[64]
Definition: msmpeg4data.c:1987
static av_cold int mss2_decode_end(AVCodecContext *avctx)
Definition: mss2.c:796
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:575
#define init_vlc(vlc, nb_bits, nb_codes,bits, bits_wrap, bits_size,codes, codes_wrap, codes_size,flags)
Definition: get_bits.h:424
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:271
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:263
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:375
DSPContext dsp
pointers for accelerated dsp functions
Definition: mpegvideo.h:411
uint8_t respic
Frame-level flag for resized images.
Definition: vc1.h:282
int quantizer_mode
2bits, quantizer mode used for sequence, see QUANT_*
Definition: vc1.h:235
int max_b_frames
max number of b-frames for encoding
Definition: mpegvideo.h:285
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:399
union ArithCoder::@52 gbc
#define MAX_WMV9_RECTANGLES
Definition: mss2.c:455
int vstransform
variable-size [48]x[48] transform type + info
Definition: vc1.h:233
#define MIN_CACHE_BITS
Definition: get_bits.h:123
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:273
AVCodec ff_mss2_decoder
Definition: mss2.c:843
#define AV_RL24
Definition: intreadwrite.h:78
static const uint16_t scale[4]
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:113
qpel_mc_func(* qpel_avg)[16]
Definition: mpegvideo.h:252
MpegEncContext s
Definition: vc1.h:183
VC1Context v
Definition: mss2.c:35
MpegEncContext.
Definition: mpegvideo.h:264
void ff_vc1_init_transposed_scantables(VC1Context *v)
Definition: vc1dec.c:5564
struct AVCodecContext * avctx
Definition: mpegvideo.h:266
int y
Definition: mss2.c:452
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:65
common internal api header.
void ff_mss12_slicecontext_reset(SliceContext *sc)
Definition: mss12.c:426
void(* mss2_blit_wmv9_masked)(uint8_t *dst, int dst_stride, int maskcolor, const uint8_t *mask, int mask_stride, const uint8_t *srcy, int srcy_stride, const uint8_t *srcu, const uint8_t *srcv, int srcuv_stride, int w, int h)
Definition: mss2dsp.h:36
int res_fasttx
reserved, always 1
Definition: vc1.h:196
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:214
enum AVDiscard skip_loop_filter
Definition: avcodec.h:2687
Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder DSP routines.
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:498
int free_colours
Definition: mss12.h:86
void * priv_data
Definition: avcodec.h:1090
#define av_log2
Definition: intmath.h:85
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:66
int low
Definition: mss12.h:49
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:163
uint8_t * last_rgb_pic
Definition: mss12.h:84
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:416
int bitrtq_postproc
5bits, quantized framerate-based postprocessing strength
Definition: vc1.h:229
AVFrame * last_pic
Definition: mss2.c:37
#define ARITH_GET_MODEL_SYM(VERSION)
Definition: mss12.h:118
static int decode_pal_v2(MSS12Context *ctx, const uint8_t *buf, int buf_size)
Definition: mss2.c:156
struct AVFrame f
Definition: mpegvideo.h:100
#define av_uninit(x)
Definition: attributes.h:109
int ff_vc1_decode_init_alloc_tables(VC1Context *v)
Definition: vc1dec.c:5489
static void arith2_normalise(ArithCoder *c)
Definition: mss2.c:43
#define READ_PAIR(a, b)
MSS2DSPContext dsp
Definition: mss2.c:39
static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: mss2.c:458
int dquant
How qscale varies with MBs, 2bits (not in Simple)
Definition: vc1.h:232
int mvX
Definition: mss12.h:88
#define FFSWAP(type, a, b)
Definition: common.h:60
int(* get_number)(struct ArithCoder *c, int n)
Definition: mss12.h:55
This structure stores compressed data.
Definition: avcodec.h:950
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:333
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:877
av_cold void ff_vc1dsp_init(VC1DSPContext *dsp)
Definition: vc1dsp.c:867
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:205
uint8_t * pal_pic
Definition: mss12.h:78
VC1DSPContext vc1dsp
Definition: vc1.h:186
Predicted.
Definition: avutil.h:254
Common header for Microsoft Screen 1 and 2.
int x
Definition: mss2.c:452