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 "mpeg_er.h"
30 #include "msmpeg4data.h"
31 #include "qpeldsp.h"
32 #include "vc1.h"
33 #include "mss12.h"
34 #include "mss2dsp.h"
35 
36 typedef struct MSS2Context {
44 } MSS2Context;
45 
47 {
48  while ((c->high >> 15) - (c->low >> 15) < 2) {
49  if ((c->low ^ c->high) & 0x10000) {
50  c->high ^= 0x8000;
51  c->value ^= 0x8000;
52  c->low ^= 0x8000;
53  }
54  c->high = c->high << 8 & 0xFFFFFF | 0xFF;
55  c->value = c->value << 8 & 0xFFFFFF | bytestream2_get_byte(c->gbc.gB);
56  c->low = c->low << 8 & 0xFFFFFF;
57  }
58 }
59 
61 
62 /* L. Stuiver and A. Moffat: "Piecewise Integer Mapping for Arithmetic Coding."
63  * In Proc. 8th Data Compression Conference (DCC '98), pp. 3-12, Mar. 1998 */
64 
65 static int arith2_get_scaled_value(int value, int n, int range)
66 {
67  int split = (n << 1) - range;
68 
69  if (value > split)
70  return split + (value - split >> 1);
71  else
72  return value;
73 }
74 
75 static void arith2_rescale_interval(ArithCoder *c, int range,
76  int low, int high, int n)
77 {
78  int split = (n << 1) - range;
79 
80  if (high > split)
81  c->high = split + (high - split << 1);
82  else
83  c->high = high;
84 
85  c->high += c->low - 1;
86 
87  if (low > split)
88  c->low += split + (low - split << 1);
89  else
90  c->low += low;
91 }
92 
93 static int arith2_get_number(ArithCoder *c, int n)
94 {
95  int range = c->high - c->low + 1;
96  int scale = av_log2(range) - av_log2(n);
97  int val;
98 
99  if (n << scale > range)
100  scale--;
101 
102  n <<= scale;
103 
104  val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
105 
106  arith2_rescale_interval(c, range, val << scale, (val + 1) << scale, n);
107 
108  arith2_normalise(c);
109 
110  return val;
111 }
112 
113 static int arith2_get_prob(ArithCoder *c, int16_t *probs)
114 {
115  int range = c->high - c->low + 1, n = *probs;
116  int scale = av_log2(range) - av_log2(n);
117  int i = 0, val;
118 
119  if (n << scale > range)
120  scale--;
121 
122  n <<= scale;
123 
124  val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
125  while (probs[++i] > val) ;
126 
127  arith2_rescale_interval(c, range,
128  probs[i] << scale, probs[i - 1] << scale, n);
129 
130  return i;
131 }
132 
134 
136 {
137  int diff = (c->high >> 16) - (c->low >> 16);
138  int bp = bytestream2_tell(c->gbc.gB) - 3 << 3;
139  int bits = 1;
140 
141  while (!(diff & 0x80)) {
142  bits++;
143  diff <<= 1;
144  }
145 
146  return (bits + bp + 7 >> 3) + ((c->low >> 16) + 1 == c->high >> 16);
147 }
148 
150 {
151  c->low = 0;
152  c->high = 0xFFFFFF;
153  c->value = bytestream2_get_be24(gB);
154  c->gbc.gB = gB;
155  c->get_model_sym = arith2_get_model_sym;
157 }
158 
159 static int decode_pal_v2(MSS12Context *ctx, const uint8_t *buf, int buf_size)
160 {
161  int i, ncol;
162  uint32_t *pal = ctx->pal + 256 - ctx->free_colours;
163 
164  if (!ctx->free_colours)
165  return 0;
166 
167  ncol = *buf++;
168  if (ncol > ctx->free_colours || buf_size < 2 + ncol * 3)
169  return AVERROR_INVALIDDATA;
170  for (i = 0; i < ncol; i++)
171  *pal++ = AV_RB24(buf + 3 * i);
172 
173  return 1 + ncol * 3;
174 }
175 
176 static int decode_555(GetByteContext *gB, uint16_t *dst, int stride,
177  int keyframe, int w, int h)
178 {
179  int last_symbol = 0, repeat = 0, prev_avail = 0;
180 
181  if (!keyframe) {
182  int x, y, endx, endy, t;
183 
184 #define READ_PAIR(a, b) \
185  a = bytestream2_get_byte(gB) << 4; \
186  t = bytestream2_get_byte(gB); \
187  a |= t >> 4; \
188  b = (t & 0xF) << 8; \
189  b |= bytestream2_get_byte(gB); \
190 
191  READ_PAIR(x, endx)
192  READ_PAIR(y, endy)
193 
194  if (endx >= w || endy >= h || x > endx || y > endy)
195  return AVERROR_INVALIDDATA;
196  dst += x + stride * y;
197  w = endx - x + 1;
198  h = endy - y + 1;
199  if (y)
200  prev_avail = 1;
201  }
202 
203  do {
204  uint16_t *p = dst;
205  do {
206  if (repeat-- < 1) {
207  int b = bytestream2_get_byte(gB);
208  if (b < 128)
209  last_symbol = b << 8 | bytestream2_get_byte(gB);
210  else if (b > 129) {
211  repeat = 0;
212  while (b-- > 130)
213  repeat = (repeat << 8) + bytestream2_get_byte(gB) + 1;
214  if (last_symbol == -2) {
215  int skip = FFMIN((unsigned)repeat, dst + w - p);
216  repeat -= skip;
217  p += skip;
218  }
219  } else
220  last_symbol = 127 - b;
221  }
222  if (last_symbol >= 0)
223  *p = last_symbol;
224  else if (last_symbol == -1 && prev_avail)
225  *p = *(p - stride);
226  } while (++p < dst + w);
227  dst += stride;
228  prev_avail = 1;
229  } while (--h);
230 
231  return 0;
232 }
233 
234 static int decode_rle(GetBitContext *gb, uint8_t *pal_dst, int pal_stride,
235  uint8_t *rgb_dst, int rgb_stride, uint32_t *pal,
236  int keyframe, int kf_slipt, int slice, int w, int h)
237 {
238  uint8_t bits[270] = { 0 };
239  uint32_t codes[270];
240  VLC vlc;
241 
242  int current_length = 0, read_codes = 0, next_code = 0, current_codes = 0;
243  int remaining_codes, surplus_codes, i;
244 
245  const int alphabet_size = 270 - keyframe;
246 
247  int last_symbol = 0, repeat = 0, prev_avail = 0;
248 
249  if (!keyframe) {
250  int x, y, clipw, cliph;
251 
252  x = get_bits(gb, 12);
253  y = get_bits(gb, 12);
254  clipw = get_bits(gb, 12) + 1;
255  cliph = get_bits(gb, 12) + 1;
256 
257  if (x + clipw > w || y + cliph > h)
258  return AVERROR_INVALIDDATA;
259  pal_dst += pal_stride * y + x;
260  rgb_dst += rgb_stride * y + x * 3;
261  w = clipw;
262  h = cliph;
263  if (y)
264  prev_avail = 1;
265  } else {
266  if (slice > 0) {
267  pal_dst += pal_stride * kf_slipt;
268  rgb_dst += rgb_stride * kf_slipt;
269  prev_avail = 1;
270  h -= kf_slipt;
271  } else
272  h = kf_slipt;
273  }
274 
275  /* read explicit codes */
276  do {
277  while (current_codes--) {
278  int symbol = get_bits(gb, 8);
279  if (symbol >= 204 - keyframe)
280  symbol += 14 - keyframe;
281  else if (symbol > 189)
282  symbol = get_bits1(gb) + (symbol << 1) - 190;
283  if (bits[symbol])
284  return AVERROR_INVALIDDATA;
285  bits[symbol] = current_length;
286  codes[symbol] = next_code++;
287  read_codes++;
288  }
289  current_length++;
290  next_code <<= 1;
291  remaining_codes = (1 << current_length) - next_code;
292  current_codes = get_bits(gb, av_ceil_log2(remaining_codes + 1));
293  if (current_length > 22 || current_codes > remaining_codes)
294  return AVERROR_INVALIDDATA;
295  } while (current_codes != remaining_codes);
296 
297  remaining_codes = alphabet_size - read_codes;
298 
299  /* determine the minimum length to fit the rest of the alphabet */
300  while ((surplus_codes = (2 << current_length) -
301  (next_code << 1) - remaining_codes) < 0) {
302  current_length++;
303  next_code <<= 1;
304  }
305 
306  /* add the rest of the symbols lexicographically */
307  for (i = 0; i < alphabet_size; i++)
308  if (!bits[i]) {
309  if (surplus_codes-- == 0) {
310  current_length++;
311  next_code <<= 1;
312  }
313  bits[i] = current_length;
314  codes[i] = next_code++;
315  }
316 
317  if (next_code != 1 << current_length)
318  return AVERROR_INVALIDDATA;
319 
320  if (i = init_vlc(&vlc, 9, alphabet_size, bits, 1, 1, codes, 4, 4, 0))
321  return i;
322 
323  /* frame decode */
324  do {
325  uint8_t *pp = pal_dst;
326  uint8_t *rp = rgb_dst;
327  do {
328  if (repeat-- < 1) {
329  int b = get_vlc2(gb, vlc.table, 9, 3);
330  if (b < 256)
331  last_symbol = b;
332  else if (b < 268) {
333  b -= 256;
334  if (b == 11)
335  b = get_bits(gb, 4) + 10;
336 
337  if (!b)
338  repeat = 0;
339  else
340  repeat = get_bits(gb, b);
341 
342  repeat += (1 << b) - 1;
343 
344  if (last_symbol == -2) {
345  int skip = FFMIN(repeat, pal_dst + w - pp);
346  repeat -= skip;
347  pp += skip;
348  rp += skip * 3;
349  }
350  } else
351  last_symbol = 267 - b;
352  }
353  if (last_symbol >= 0) {
354  *pp = last_symbol;
355  AV_WB24(rp, pal[last_symbol]);
356  } else if (last_symbol == -1 && prev_avail) {
357  *pp = *(pp - pal_stride);
358  memcpy(rp, rp - rgb_stride, 3);
359  }
360  rp += 3;
361  } while (++pp < pal_dst + w);
362  pal_dst += pal_stride;
363  rgb_dst += rgb_stride;
364  prev_avail = 1;
365  } while (--h);
366 
367  ff_free_vlc(&vlc);
368  return 0;
369 }
370 
371 static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size,
372  int x, int y, int w, int h, int wmv9_mask)
373 {
374  MSS2Context *ctx = avctx->priv_data;
375  MSS12Context *c = &ctx->c;
376  VC1Context *v = avctx->priv_data;
377  MpegEncContext *s = &v->s;
378  AVFrame *f;
379  int ret;
380 
381  ff_mpeg_flush(avctx);
382 
383  init_get_bits(&s->gb, buf, buf_size * 8);
384 
386 
387  if (ff_vc1_parse_frame_header(v, &s->gb) < 0) {
388  av_log(v->s.avctx, AV_LOG_ERROR, "header error\n");
389  return AVERROR_INVALIDDATA;
390  }
391 
392  if (s->pict_type != AV_PICTURE_TYPE_I) {
393  av_log(v->s.avctx, AV_LOG_ERROR, "expected I-frame\n");
394  return AVERROR_INVALIDDATA;
395  }
396 
397  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
398 
399  if ((ret = ff_mpv_frame_start(s, avctx)) < 0) {
400  av_log(v->s.avctx, AV_LOG_ERROR, "ff_mpv_frame_start error\n");
401  avctx->pix_fmt = AV_PIX_FMT_RGB24;
402  return ret;
403  }
404 
406 
407  v->bits = buf_size * 8;
408 
409  v->end_mb_x = (w + 15) >> 4;
410  s->end_mb_y = (h + 15) >> 4;
411  if (v->respic & 1)
412  v->end_mb_x = v->end_mb_x + 1 >> 1;
413  if (v->respic & 2)
414  s->end_mb_y = s->end_mb_y + 1 >> 1;
415 
417 
418  ff_er_frame_end(&s->er);
419 
420  ff_mpv_frame_end(s);
421 
422  f = s->current_picture.f;
423 
424  if (v->respic == 3) {
425  ctx->dsp.upsample_plane(f->data[0], f->linesize[0], w, h);
426  ctx->dsp.upsample_plane(f->data[1], f->linesize[1], w >> 1, h >> 1);
427  ctx->dsp.upsample_plane(f->data[2], f->linesize[2], w >> 1, h >> 1);
428  } else if (v->respic)
430  "Asymmetric WMV9 rectangle subsampling");
431 
432  av_assert0(f->linesize[1] == f->linesize[2]);
433 
434  if (wmv9_mask != -1)
435  ctx->dsp.mss2_blit_wmv9_masked(c->rgb_pic + y * c->rgb_stride + x * 3,
436  c->rgb_stride, wmv9_mask,
437  c->pal_pic + y * c->pal_stride + x,
438  c->pal_stride,
439  f->data[0], f->linesize[0],
440  f->data[1], f->data[2], f->linesize[1],
441  w, h);
442  else
443  ctx->dsp.mss2_blit_wmv9(c->rgb_pic + y * c->rgb_stride + x * 3,
444  c->rgb_stride,
445  f->data[0], f->linesize[0],
446  f->data[1], f->data[2], f->linesize[1],
447  w, h);
448 
449  avctx->pix_fmt = AV_PIX_FMT_RGB24;
450 
451  return 0;
452 }
453 
454 typedef struct Rectangle {
455  int coded, x, y, w, h;
456 } Rectangle;
457 
458 #define MAX_WMV9_RECTANGLES 20
459 #define ARITH2_PADDING 2
460 
461 static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
462  AVPacket *avpkt)
463 {
464  const uint8_t *buf = avpkt->data;
465  int buf_size = avpkt->size;
466  MSS2Context *ctx = avctx->priv_data;
467  MSS12Context *c = &ctx->c;
468  AVFrame *frame = data;
469  GetBitContext gb;
470  GetByteContext gB;
471  ArithCoder acoder;
472 
473  int keyframe, has_wmv9, has_mv, is_rle, is_555, ret;
474 
475  Rectangle wmv9rects[MAX_WMV9_RECTANGLES], *r;
476  int used_rects = 0, i, implicit_rect = 0, av_uninit(wmv9_mask);
477 
479  ARITH2_PADDING + (MIN_CACHE_BITS + 7) / 8);
480 
481  init_get_bits(&gb, buf, buf_size * 8);
482 
483  if (keyframe = get_bits1(&gb))
484  skip_bits(&gb, 7);
485  has_wmv9 = get_bits1(&gb);
486  has_mv = keyframe ? 0 : get_bits1(&gb);
487  is_rle = get_bits1(&gb);
488  is_555 = is_rle && get_bits1(&gb);
489  if (c->slice_split > 0)
490  ctx->split_position = c->slice_split;
491  else if (c->slice_split < 0) {
492  if (get_bits1(&gb)) {
493  if (get_bits1(&gb)) {
494  if (get_bits1(&gb))
495  ctx->split_position = get_bits(&gb, 16);
496  else
497  ctx->split_position = get_bits(&gb, 12);
498  } else
499  ctx->split_position = get_bits(&gb, 8) << 4;
500  } else {
501  if (keyframe)
502  ctx->split_position = avctx->height / 2;
503  }
504  } else
505  ctx->split_position = avctx->height;
506 
507  if (c->slice_split && (ctx->split_position < 1 - is_555 ||
508  ctx->split_position > avctx->height - 1))
509  return AVERROR_INVALIDDATA;
510 
511  align_get_bits(&gb);
512  buf += get_bits_count(&gb) >> 3;
513  buf_size -= get_bits_count(&gb) >> 3;
514 
515  if (buf_size < 1)
516  return AVERROR_INVALIDDATA;
517 
518  if (is_555 && (has_wmv9 || has_mv || c->slice_split && ctx->split_position))
519  return AVERROR_INVALIDDATA;
520 
521  avctx->pix_fmt = is_555 ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_RGB24;
522  if (ctx->last_pic->format != avctx->pix_fmt)
523  av_frame_unref(ctx->last_pic);
524 
525  if (has_wmv9) {
526  bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
527  arith2_init(&acoder, &gB);
528 
529  implicit_rect = !arith2_get_bit(&acoder);
530 
531  while (arith2_get_bit(&acoder)) {
532  if (used_rects == MAX_WMV9_RECTANGLES)
533  return AVERROR_INVALIDDATA;
534  r = &wmv9rects[used_rects];
535  if (!used_rects)
536  r->x = arith2_get_number(&acoder, avctx->width);
537  else
538  r->x = arith2_get_number(&acoder, avctx->width -
539  wmv9rects[used_rects - 1].x) +
540  wmv9rects[used_rects - 1].x;
541  r->y = arith2_get_number(&acoder, avctx->height);
542  r->w = arith2_get_number(&acoder, avctx->width - r->x) + 1;
543  r->h = arith2_get_number(&acoder, avctx->height - r->y) + 1;
544  used_rects++;
545  }
546 
547  if (implicit_rect && used_rects) {
548  av_log(avctx, AV_LOG_ERROR, "implicit_rect && used_rects > 0\n");
549  return AVERROR_INVALIDDATA;
550  }
551 
552  if (implicit_rect) {
553  wmv9rects[0].x = 0;
554  wmv9rects[0].y = 0;
555  wmv9rects[0].w = avctx->width;
556  wmv9rects[0].h = avctx->height;
557 
558  used_rects = 1;
559  }
560  for (i = 0; i < used_rects; i++) {
561  if (!implicit_rect && arith2_get_bit(&acoder)) {
562  av_log(avctx, AV_LOG_ERROR, "Unexpected grandchildren\n");
563  return AVERROR_INVALIDDATA;
564  }
565  if (!i) {
566  wmv9_mask = arith2_get_bit(&acoder) - 1;
567  if (!wmv9_mask)
568  wmv9_mask = arith2_get_number(&acoder, 256);
569  }
570  wmv9rects[i].coded = arith2_get_number(&acoder, 2);
571  }
572 
573  buf += arith2_get_consumed_bytes(&acoder);
574  buf_size -= arith2_get_consumed_bytes(&acoder);
575  if (buf_size < 1)
576  return AVERROR_INVALIDDATA;
577  }
578 
579  c->mvX = c->mvY = 0;
580  if (keyframe && !is_555) {
581  if ((i = decode_pal_v2(c, buf, buf_size)) < 0)
582  return AVERROR_INVALIDDATA;
583  buf += i;
584  buf_size -= i;
585  } else if (has_mv) {
586  buf += 4;
587  buf_size -= 4;
588  if (buf_size < 1)
589  return AVERROR_INVALIDDATA;
590  c->mvX = AV_RB16(buf - 4) - avctx->width;
591  c->mvY = AV_RB16(buf - 2) - avctx->height;
592  }
593 
594  if (c->mvX < 0 || c->mvY < 0) {
595  FFSWAP(uint8_t *, c->pal_pic, c->last_pal_pic);
596 
597  if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) {
598  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
599  return ret;
600  }
601 
602  if (ctx->last_pic->data[0]) {
603  av_assert0(frame->linesize[0] == ctx->last_pic->linesize[0]);
604  c->last_rgb_pic = ctx->last_pic->data[0] +
605  ctx->last_pic->linesize[0] * (avctx->height - 1);
606  } else {
607  av_log(avctx, AV_LOG_ERROR, "Missing keyframe\n");
608  return AVERROR_INVALIDDATA;
609  }
610  } else {
611  if ((ret = ff_reget_buffer(avctx, ctx->last_pic)) < 0) {
612  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
613  return ret;
614  }
615  if ((ret = av_frame_ref(frame, ctx->last_pic)) < 0)
616  return ret;
617 
618  c->last_rgb_pic = NULL;
619  }
620  c->rgb_pic = frame->data[0] +
621  frame->linesize[0] * (avctx->height - 1);
622  c->rgb_stride = -frame->linesize[0];
623 
624  frame->key_frame = keyframe;
625  frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
626 
627  if (is_555) {
628  bytestream2_init(&gB, buf, buf_size);
629 
630  if (decode_555(&gB, (uint16_t *)c->rgb_pic, c->rgb_stride >> 1,
631  keyframe, avctx->width, avctx->height))
632  return AVERROR_INVALIDDATA;
633 
634  buf_size -= bytestream2_tell(&gB);
635  } else {
636  if (keyframe) {
637  c->corrupted = 0;
639  if (c->slice_split)
641  }
642  if (is_rle) {
643  init_get_bits(&gb, buf, buf_size * 8);
644  if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
645  c->rgb_pic, c->rgb_stride, c->pal, keyframe,
646  ctx->split_position, 0,
647  avctx->width, avctx->height))
648  return ret;
649  align_get_bits(&gb);
650 
651  if (c->slice_split)
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, 1,
655  avctx->width, avctx->height))
656  return ret;
657 
658  align_get_bits(&gb);
659  buf += get_bits_count(&gb) >> 3;
660  buf_size -= get_bits_count(&gb) >> 3;
661  } else if (!implicit_rect || wmv9_mask != -1) {
662  if (c->corrupted)
663  return AVERROR_INVALIDDATA;
664  bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
665  arith2_init(&acoder, &gB);
666  c->keyframe = keyframe;
667  if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[0], &acoder, 0, 0,
668  avctx->width,
669  ctx->split_position))
670  return AVERROR_INVALIDDATA;
671 
672  buf += arith2_get_consumed_bytes(&acoder);
673  buf_size -= arith2_get_consumed_bytes(&acoder);
674  if (c->slice_split) {
675  if (buf_size < 1)
676  return AVERROR_INVALIDDATA;
677  bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
678  arith2_init(&acoder, &gB);
679  if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[1], &acoder, 0,
680  ctx->split_position,
681  avctx->width,
682  avctx->height - ctx->split_position))
683  return AVERROR_INVALIDDATA;
684 
685  buf += arith2_get_consumed_bytes(&acoder);
686  buf_size -= arith2_get_consumed_bytes(&acoder);
687  }
688  } else
689  memset(c->pal_pic, 0, c->pal_stride * avctx->height);
690  }
691 
692  if (has_wmv9) {
693  for (i = 0; i < used_rects; i++) {
694  int x = wmv9rects[i].x;
695  int y = wmv9rects[i].y;
696  int w = wmv9rects[i].w;
697  int h = wmv9rects[i].h;
698  if (wmv9rects[i].coded) {
699  int WMV9codedFrameSize;
700  if (buf_size < 4 || !(WMV9codedFrameSize = AV_RL24(buf)))
701  return AVERROR_INVALIDDATA;
702  if (ret = decode_wmv9(avctx, buf + 3, buf_size - 3,
703  x, y, w, h, wmv9_mask))
704  return ret;
705  buf += WMV9codedFrameSize + 3;
706  buf_size -= WMV9codedFrameSize + 3;
707  } else {
708  uint8_t *dst = c->rgb_pic + y * c->rgb_stride + x * 3;
709  if (wmv9_mask != -1) {
710  ctx->dsp.mss2_gray_fill_masked(dst, c->rgb_stride,
711  wmv9_mask,
712  c->pal_pic + y * c->pal_stride + x,
713  c->pal_stride,
714  w, h);
715  } else {
716  do {
717  memset(dst, 0x80, w * 3);
718  dst += c->rgb_stride;
719  } while (--h);
720  }
721  }
722  }
723  }
724 
725  if (buf_size)
726  av_log(avctx, AV_LOG_WARNING, "buffer not fully consumed\n");
727 
728  if (c->mvX < 0 || c->mvY < 0) {
729  av_frame_unref(ctx->last_pic);
730  ret = av_frame_ref(ctx->last_pic, frame);
731  if (ret < 0)
732  return ret;
733  }
734 
735  *got_frame = 1;
736 
737  return avpkt->size;
738 }
739 
740 static av_cold int wmv9_init(AVCodecContext *avctx)
741 {
742  VC1Context *v = avctx->priv_data;
743  int ret;
744 
745  v->s.avctx = avctx;
746 
747  if ((ret = ff_vc1_init_common(v)) < 0)
748  return ret;
749  ff_vc1dsp_init(&v->vc1dsp);
750 
751  v->profile = PROFILE_MAIN;
752 
755  v->res_y411 = 0;
756  v->res_sprite = 0;
757 
758  v->frmrtq_postproc = 7;
759  v->bitrtq_postproc = 31;
760 
761  v->res_x8 = 0;
762  v->multires = 0;
763  v->res_fasttx = 1;
764 
765  v->fastuvmc = 0;
766 
767  v->extended_mv = 0;
768 
769  v->dquant = 1;
770  v->vstransform = 1;
771 
772  v->res_transtab = 0;
773 
774  v->overlap = 0;
775 
776  v->resync_marker = 0;
777  v->rangered = 0;
778 
779  v->s.max_b_frames = avctx->max_b_frames = 0;
780  v->quantizer_mode = 0;
781 
782  v->finterpflag = 0;
783 
784  v->res_rtm_flag = 1;
785 
787 
788  if ((ret = ff_msmpeg4_decode_init(avctx)) < 0 ||
789  (ret = ff_vc1_decode_init_alloc_tables(v)) < 0)
790  return ret;
791 
792  /* error concealment */
795 
796  return 0;
797 }
798 
800 {
801  MSS2Context *const ctx = avctx->priv_data;
802 
803  av_frame_free(&ctx->last_pic);
804 
805  ff_mss12_decode_end(&ctx->c);
806  av_freep(&ctx->c.pal_pic);
807  av_freep(&ctx->c.last_pal_pic);
808  ff_vc1_decode_end(avctx);
809 
810  return 0;
811 }
812 
814 {
815  MSS2Context * const ctx = avctx->priv_data;
816  MSS12Context *c = &ctx->c;
817  int ret;
818  c->avctx = avctx;
819  if (ret = ff_mss12_decode_init(c, 1, &ctx->sc[0], &ctx->sc[1]))
820  return ret;
821  c->pal_stride = c->mask_stride;
822  c->pal_pic = av_mallocz(c->pal_stride * avctx->height);
823  c->last_pal_pic = av_mallocz(c->pal_stride * avctx->height);
824  if (!c->pal_pic || !c->last_pal_pic) {
825  mss2_decode_end(avctx);
826  return AVERROR(ENOMEM);
827  }
828  if (ret = wmv9_init(avctx)) {
829  mss2_decode_end(avctx);
830  return ret;
831  }
832  ff_mss2dsp_init(&ctx->dsp);
833  ff_qpeldsp_init(&ctx->qdsp);
834 
835  avctx->pix_fmt = c->free_colours == 127 ? AV_PIX_FMT_RGB555
837 
838  ctx->last_pic = av_frame_alloc();
839  if (!ctx->last_pic) {
840  mss2_decode_end(avctx);
841  return AVERROR(ENOMEM);
842  }
843 
844  return 0;
845 }
846 
848  .name = "mss2",
849  .long_name = NULL_IF_CONFIG_SMALL("MS Windows Media Video V9 Screen"),
850  .type = AVMEDIA_TYPE_VIDEO,
851  .id = AV_CODEC_ID_MSS2,
852  .priv_data_size = sizeof(MSS2Context),
856  .capabilities = CODEC_CAP_DR1,
857 };
#define ARITH_GET_BIT(VERSION)
Definition: mss12.h:102
static av_cold int mss2_decode_init(AVCodecContext *avctx)
Definition: mss2.c:813
MSS12Context c
Definition: mss2.c:40
#define ARITH2_PADDING
Definition: mss2.c:459
qpel_mc_func avg_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:74
#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:65
QpelDSPContext qdsp
Definition: mss2.c:42
The VC1 Context.
Definition: vc1.h:182
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
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:234
int high
Definition: mss12.h:49
av_cold int ff_mss12_decode_init(MSS12Context *c, int version, SliceContext *sc1, SliceContext *sc2)
Definition: mss12.c:564
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:280
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:1325
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:75
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
union ArithCoder::@53 gbc
#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:1270
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:132
int w
Definition: mss2.c:455
discard all
Definition: avcodec.h:568
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
QpelDSPContext qdsp
Definition: mpegvideo.h:359
int stride
Definition: mace.c:144
AVCodec.
Definition: avcodec.h:2812
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:528
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:275
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:251
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:57
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:1568
#define b
Definition: input.c:52
qpel_mc_func(* qpel_put)[16]
Definition: mpegvideo.h:191
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:188
int coded
Definition: mss2.c:455
int split_position
Definition: mss2.c:38
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:306
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:684
quarterpel DSP functions
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:70
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
int ff_vc1_decode_end(AVCodecContext *avctx)
Close a VC1/WMV3 decoder.
Definition: vc1dec.c:5746
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:93
int h
Definition: mss2.c:455
#define r
Definition: input.c:51
static int arith2_get_prob(ArithCoder *c, int16_t *probs)
Definition: mss2.c:113
static av_cold int wmv9_init(AVCodecContext *avctx)
Definition: mss2.c:740
#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:371
#define AV_RB16
Definition: intreadwrite.h:53
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:69
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:145
ERContext er
Definition: mpegvideo.h:638
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:5210
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
const char * name
Name of the codec implementation.
Definition: avcodec.h:2819
qpel_mc_func put_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:73
GetBitContext gb
Definition: mpegvideo.h:558
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:85
static void arith2_init(ArithCoder *c, GetByteContext *gB)
Definition: mss2.c:149
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2503
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:531
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:829
SliceContext sc[2]
Definition: mss2.c:43
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:196
#define FFMIN(a, b)
Definition: common.h:57
int width
picture width / height.
Definition: avcodec.h:1229
void ff_mpeg_er_frame_start(MpegEncContext *s)
Definition: mpeg_er.c:45
#define AV_WB24(p, d)
Definition: intreadwrite.h:412
int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext *gb)
Definition: vc1.c:624
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:176
MotionEstContext me
Definition: mpegvideo.h:404
static int arith2_get_consumed_bytes(ArithCoder *c)
Definition: mss2.c:135
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:185
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:186
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:681
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:153
int multires
frame-level RESPIC syntax element present
Definition: vc1.h:195
main external API structure.
Definition: avcodec.h:1050
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
const uint8_t ff_wmv2_scantableA[64]
Definition: msmpeg4data.c:1987
static av_cold int mss2_decode_end(AVCodecContext *avctx)
Definition: mss2.c:799
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:621
#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
struct AVFrame * f
Definition: mpegvideo.h:100
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:375
uint8_t respic
Frame-level flag for resized images.
Definition: vc1.h:282
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:1751
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:240
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:339
quarterpel DSP context
Definition: qpeldsp.h:72
#define MAX_WMV9_RECTANGLES
Definition: mss2.c:458
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:283
AVCodec ff_mss2_decoder
Definition: mss2.c:847
#define AV_RL24
Definition: intreadwrite.h:78
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
qpel_mc_func(* qpel_avg)[16]
Definition: mpegvideo.h:192
MpegEncContext s
Definition: vc1.h:183
VC1Context v
Definition: mss2.c:37
MpegEncContext.
Definition: mpegvideo.h:204
void ff_vc1_init_transposed_scantables(VC1Context *v)
Definition: vc1dec.c:5595
struct AVCodecContext * avctx
Definition: mpegvideo.h:221
int y
Definition: mss2.c:455
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:428
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:231
enum AVDiscard skip_loop_filter
Definition: avcodec.h:2729
Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder DSP routines.
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
int free_colours
Definition: mss12.h:86
void * priv_data
Definition: avcodec.h:1092
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1963
#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:191
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:39
#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:159
#define av_uninit(x)
Definition: attributes.h:109
int ff_vc1_decode_init_alloc_tables(VC1Context *v)
Definition: vc1dec.c:5520
static void arith2_normalise(ArithCoder *c)
Definition: mss2.c:46
#define READ_PAIR(a, b)
MSS2DSPContext dsp
Definition: mss2.c:41
static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: mss2.c:461
int dquant
How qscale varies with MBs, 2bits (not in Simple)
Definition: vc1.h:232
int mvX
Definition: mss12.h:88
av_cold void ff_qpeldsp_init(QpelDSPContext *c)
Definition: qpeldsp.c:735
#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:850
av_cold void ff_vc1dsp_init(VC1DSPContext *dsp)
Definition: vc1dsp.c:882
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:455