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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 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 "msmpeg4data.h"
32 #include "qpeldsp.h"
33 #include "vc1.h"
34 #include "mss12.h"
35 #include "mss2dsp.h"
36 
37 typedef struct MSS2Context {
45 } MSS2Context;
46 
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 
61 ARITH_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 
66 static int arith2_get_scaled_value(int value, int n, int range)
67 {
68  int split = (n << 1) - range;
69 
70  if (value > split)
71  return split + (value - split >> 1);
72  else
73  return value;
74 }
75 
76 static void arith2_rescale_interval(ArithCoder *c, int range,
77  int low, int high, int n)
78 {
79  int split = (n << 1) - range;
80 
81  if (high > split)
82  c->high = split + (high - split << 1);
83  else
84  c->high = high;
85 
86  c->high += c->low - 1;
87 
88  if (low > split)
89  c->low += split + (low - split << 1);
90  else
91  c->low += low;
92 }
93 
94 static int arith2_get_number(ArithCoder *c, int n)
95 {
96  int range = c->high - c->low + 1;
97  int scale = av_log2(range) - av_log2(n);
98  int val;
99 
100  if (n << scale > range)
101  scale--;
102 
103  n <<= scale;
104 
105  val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
106 
107  arith2_rescale_interval(c, range, val << scale, (val + 1) << scale, n);
108 
109  arith2_normalise(c);
110 
111  return val;
112 }
113 
114 static int arith2_get_prob(ArithCoder *c, int16_t *probs)
115 {
116  int range = c->high - c->low + 1, n = *probs;
117  int scale = av_log2(range) - av_log2(n);
118  int i = 0, val;
119 
120  if (n << scale > range)
121  scale--;
122 
123  n <<= scale;
124 
125  val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
126  while (probs[++i] > val) ;
127 
128  arith2_rescale_interval(c, range,
129  probs[i] << scale, probs[i - 1] << scale, n);
130 
131  return i;
132 }
133 
134 ARITH_GET_MODEL_SYM(arith2)
135 
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 
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;
158 }
159 
160 static int decode_pal_v2(MSS12Context *ctx, const uint8_t *buf, int buf_size)
161 {
162  int i, ncol;
163  uint32_t *pal = ctx->pal + 256 - ctx->free_colours;
164 
165  if (!ctx->free_colours)
166  return 0;
167 
168  ncol = *buf++;
169  if (ncol > ctx->free_colours || buf_size < 2 + ncol * 3)
170  return AVERROR_INVALIDDATA;
171  for (i = 0; i < ncol; i++)
172  *pal++ = AV_RB24(buf + 3 * i);
173 
174  return 1 + ncol * 3;
175 }
176 
177 static int decode_555(GetByteContext *gB, uint16_t *dst, int stride,
178  int keyframe, int w, int h)
179 {
180  int last_symbol = 0, repeat = 0, prev_avail = 0;
181 
182  if (!keyframe) {
183  int x, y, endx, endy, t;
184 
185 #define READ_PAIR(a, b) \
186  a = bytestream2_get_byte(gB) << 4; \
187  t = bytestream2_get_byte(gB); \
188  a |= t >> 4; \
189  b = (t & 0xF) << 8; \
190  b |= bytestream2_get_byte(gB); \
191 
192  READ_PAIR(x, endx)
193  READ_PAIR(y, endy)
194 
195  if (endx >= w || endy >= h || x > endx || y > endy)
196  return AVERROR_INVALIDDATA;
197  dst += x + stride * y;
198  w = endx - x + 1;
199  h = endy - y + 1;
200  if (y)
201  prev_avail = 1;
202  }
203 
204  do {
205  uint16_t *p = dst;
206  do {
207  if (repeat-- < 1) {
208  int b = bytestream2_get_byte(gB);
209  if (b < 128)
210  last_symbol = b << 8 | bytestream2_get_byte(gB);
211  else if (b > 129) {
212  repeat = 0;
213  while (b-- > 130)
214  repeat = (repeat << 8) + bytestream2_get_byte(gB) + 1;
215  if (last_symbol == -2) {
216  int skip = FFMIN((unsigned)repeat, dst + w - p);
217  repeat -= skip;
218  p += skip;
219  }
220  } else
221  last_symbol = 127 - b;
222  }
223  if (last_symbol >= 0)
224  *p = last_symbol;
225  else if (last_symbol == -1 && prev_avail)
226  *p = *(p - stride);
227  } while (++p < dst + w);
228  dst += stride;
229  prev_avail = 1;
230  } while (--h);
231 
232  return 0;
233 }
234 
235 static int decode_rle(GetBitContext *gb, uint8_t *pal_dst, int pal_stride,
236  uint8_t *rgb_dst, int rgb_stride, uint32_t *pal,
237  int keyframe, int kf_slipt, int slice, int w, int h)
238 {
239  uint8_t bits[270] = { 0 };
240  uint32_t codes[270];
241  VLC vlc;
242 
243  int current_length = 0, read_codes = 0, next_code = 0, current_codes = 0;
244  int remaining_codes, surplus_codes, i;
245 
246  const int alphabet_size = 270 - keyframe;
247 
248  int last_symbol = 0, repeat = 0, prev_avail = 0;
249 
250  if (!keyframe) {
251  int x, y, clipw, cliph;
252 
253  x = get_bits(gb, 12);
254  y = get_bits(gb, 12);
255  clipw = get_bits(gb, 12) + 1;
256  cliph = get_bits(gb, 12) + 1;
257 
258  if (x + clipw > w || y + cliph > h)
259  return AVERROR_INVALIDDATA;
260  pal_dst += pal_stride * y + x;
261  rgb_dst += rgb_stride * y + x * 3;
262  w = clipw;
263  h = cliph;
264  if (y)
265  prev_avail = 1;
266  } else {
267  if (slice > 0) {
268  pal_dst += pal_stride * kf_slipt;
269  rgb_dst += rgb_stride * kf_slipt;
270  prev_avail = 1;
271  h -= kf_slipt;
272  } else
273  h = kf_slipt;
274  }
275 
276  /* read explicit codes */
277  do {
278  while (current_codes--) {
279  int symbol = get_bits(gb, 8);
280  if (symbol >= 204 - keyframe)
281  symbol += 14 - keyframe;
282  else if (symbol > 189)
283  symbol = get_bits1(gb) + (symbol << 1) - 190;
284  if (bits[symbol])
285  return AVERROR_INVALIDDATA;
286  bits[symbol] = current_length;
287  codes[symbol] = next_code++;
288  read_codes++;
289  }
290  current_length++;
291  next_code <<= 1;
292  remaining_codes = (1 << current_length) - next_code;
293  current_codes = get_bits(gb, av_ceil_log2(remaining_codes + 1));
294  if (current_length > 22 || current_codes > remaining_codes)
295  return AVERROR_INVALIDDATA;
296  } while (current_codes != remaining_codes);
297 
298  remaining_codes = alphabet_size - read_codes;
299 
300  /* determine the minimum length to fit the rest of the alphabet */
301  while ((surplus_codes = (2 << current_length) -
302  (next_code << 1) - remaining_codes) < 0) {
303  current_length++;
304  next_code <<= 1;
305  }
306 
307  /* add the rest of the symbols lexicographically */
308  for (i = 0; i < alphabet_size; i++)
309  if (!bits[i]) {
310  if (surplus_codes-- == 0) {
311  current_length++;
312  next_code <<= 1;
313  }
314  bits[i] = current_length;
315  codes[i] = next_code++;
316  }
317 
318  if (next_code != 1 << current_length)
319  return AVERROR_INVALIDDATA;
320 
321  if ((i = init_vlc(&vlc, 9, alphabet_size, bits, 1, 1, codes, 4, 4, 0)) < 0)
322  return i;
323 
324  /* frame decode */
325  do {
326  uint8_t *pp = pal_dst;
327  uint8_t *rp = rgb_dst;
328  do {
329  if (repeat-- < 1) {
330  int b = get_vlc2(gb, vlc.table, 9, 3);
331  if (b < 256)
332  last_symbol = b;
333  else if (b < 268) {
334  b -= 256;
335  if (b == 11)
336  b = get_bits(gb, 4) + 10;
337 
338  if (!b)
339  repeat = 0;
340  else
341  repeat = get_bits(gb, b);
342 
343  repeat += (1 << b) - 1;
344 
345  if (last_symbol == -2) {
346  int skip = FFMIN(repeat, pal_dst + w - pp);
347  repeat -= skip;
348  pp += skip;
349  rp += skip * 3;
350  }
351  } else
352  last_symbol = 267 - b;
353  }
354  if (last_symbol >= 0) {
355  *pp = last_symbol;
356  AV_WB24(rp, pal[last_symbol]);
357  } else if (last_symbol == -1 && prev_avail) {
358  *pp = *(pp - pal_stride);
359  memcpy(rp, rp - rgb_stride, 3);
360  }
361  rp += 3;
362  } while (++pp < pal_dst + w);
363  pal_dst += pal_stride;
364  rgb_dst += rgb_stride;
365  prev_avail = 1;
366  } while (--h);
367 
368  ff_free_vlc(&vlc);
369  return 0;
370 }
371 
372 static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size,
373  int x, int y, int w, int h, int wmv9_mask)
374 {
375  MSS2Context *ctx = avctx->priv_data;
376  MSS12Context *c = &ctx->c;
377  VC1Context *v = avctx->priv_data;
378  MpegEncContext *s = &v->s;
379  AVFrame *f;
380  int ret;
381 
382  ff_mpeg_flush(avctx);
383 
384  if ((ret = init_get_bits8(&s->gb, buf, buf_size)) < 0)
385  return ret;
386 
388 
389  if (ff_vc1_parse_frame_header(v, &s->gb) < 0) {
390  av_log(v->s.avctx, AV_LOG_ERROR, "header error\n");
391  return AVERROR_INVALIDDATA;
392  }
393 
394  if (s->pict_type != AV_PICTURE_TYPE_I) {
395  av_log(v->s.avctx, AV_LOG_ERROR, "expected I-frame\n");
396  return AVERROR_INVALIDDATA;
397  }
398 
399  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
400 
401  if ((ret = ff_mpv_frame_start(s, avctx)) < 0) {
402  av_log(v->s.avctx, AV_LOG_ERROR, "ff_mpv_frame_start error\n");
403  avctx->pix_fmt = AV_PIX_FMT_RGB24;
404  return ret;
405  }
406 
408 
409  v->bits = buf_size * 8;
410 
411  v->end_mb_x = (w + 15) >> 4;
412  s->end_mb_y = (h + 15) >> 4;
413  if (v->respic & 1)
414  v->end_mb_x = v->end_mb_x + 1 >> 1;
415  if (v->respic & 2)
416  s->end_mb_y = s->end_mb_y + 1 >> 1;
417 
419 
420  ff_er_frame_end(&s->er);
421 
422  ff_mpv_frame_end(s);
423 
424  f = s->current_picture.f;
425 
426  if (v->respic == 3) {
427  ctx->dsp.upsample_plane(f->data[0], f->linesize[0], w, h);
428  ctx->dsp.upsample_plane(f->data[1], f->linesize[1], w+1 >> 1, h+1 >> 1);
429  ctx->dsp.upsample_plane(f->data[2], f->linesize[2], w+1 >> 1, h+1 >> 1);
430  } else if (v->respic)
432  "Asymmetric WMV9 rectangle subsampling");
433 
434  av_assert0(f->linesize[1] == f->linesize[2]);
435 
436  if (wmv9_mask != -1)
437  ctx->dsp.mss2_blit_wmv9_masked(c->rgb_pic + y * c->rgb_stride + x * 3,
438  c->rgb_stride, wmv9_mask,
439  c->pal_pic + y * c->pal_stride + x,
440  c->pal_stride,
441  f->data[0], f->linesize[0],
442  f->data[1], f->data[2], f->linesize[1],
443  w, h);
444  else
445  ctx->dsp.mss2_blit_wmv9(c->rgb_pic + y * c->rgb_stride + x * 3,
446  c->rgb_stride,
447  f->data[0], f->linesize[0],
448  f->data[1], f->data[2], f->linesize[1],
449  w, h);
450 
451  avctx->pix_fmt = AV_PIX_FMT_RGB24;
452 
453  return 0;
454 }
455 
456 typedef struct Rectangle {
457  int coded, x, y, w, h;
458 } Rectangle;
459 
460 #define MAX_WMV9_RECTANGLES 20
461 #define ARITH2_PADDING 2
462 
463 static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
464  AVPacket *avpkt)
465 {
466  const uint8_t *buf = avpkt->data;
467  int buf_size = avpkt->size;
468  MSS2Context *ctx = avctx->priv_data;
469  MSS12Context *c = &ctx->c;
470  AVFrame *frame = data;
471  GetBitContext gb;
472  GetByteContext gB;
473  ArithCoder acoder;
474 
475  int keyframe, has_wmv9, has_mv, is_rle, is_555, ret;
476 
477  Rectangle wmv9rects[MAX_WMV9_RECTANGLES], *r;
478  int used_rects = 0, i, implicit_rect = 0, av_uninit(wmv9_mask);
479 
481  ARITH2_PADDING + (MIN_CACHE_BITS + 7) / 8);
482 
483  if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
484  return ret;
485 
486  if (keyframe = get_bits1(&gb))
487  skip_bits(&gb, 7);
488  has_wmv9 = get_bits1(&gb);
489  has_mv = keyframe ? 0 : get_bits1(&gb);
490  is_rle = get_bits1(&gb);
491  is_555 = is_rle && get_bits1(&gb);
492  if (c->slice_split > 0)
493  ctx->split_position = c->slice_split;
494  else if (c->slice_split < 0) {
495  if (get_bits1(&gb)) {
496  if (get_bits1(&gb)) {
497  if (get_bits1(&gb))
498  ctx->split_position = get_bits(&gb, 16);
499  else
500  ctx->split_position = get_bits(&gb, 12);
501  } else
502  ctx->split_position = get_bits(&gb, 8) << 4;
503  } else {
504  if (keyframe)
505  ctx->split_position = avctx->height / 2;
506  }
507  } else
508  ctx->split_position = avctx->height;
509 
510  if (c->slice_split && (ctx->split_position < 1 - is_555 ||
511  ctx->split_position > avctx->height - 1))
512  return AVERROR_INVALIDDATA;
513 
514  align_get_bits(&gb);
515  buf += get_bits_count(&gb) >> 3;
516  buf_size -= get_bits_count(&gb) >> 3;
517 
518  if (buf_size < 1)
519  return AVERROR_INVALIDDATA;
520 
521  if (is_555 && (has_wmv9 || has_mv || c->slice_split && ctx->split_position))
522  return AVERROR_INVALIDDATA;
523 
524  avctx->pix_fmt = is_555 ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_RGB24;
525  if (ctx->last_pic->format != avctx->pix_fmt)
526  av_frame_unref(ctx->last_pic);
527 
528  if (has_wmv9) {
529  bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
530  arith2_init(&acoder, &gB);
531 
532  implicit_rect = !arith2_get_bit(&acoder);
533 
534  while (arith2_get_bit(&acoder)) {
535  if (used_rects == MAX_WMV9_RECTANGLES)
536  return AVERROR_INVALIDDATA;
537  r = &wmv9rects[used_rects];
538  if (!used_rects)
539  r->x = arith2_get_number(&acoder, avctx->width);
540  else
541  r->x = arith2_get_number(&acoder, avctx->width -
542  wmv9rects[used_rects - 1].x) +
543  wmv9rects[used_rects - 1].x;
544  r->y = arith2_get_number(&acoder, avctx->height);
545  r->w = arith2_get_number(&acoder, avctx->width - r->x) + 1;
546  r->h = arith2_get_number(&acoder, avctx->height - r->y) + 1;
547  used_rects++;
548  }
549 
550  if (implicit_rect && used_rects) {
551  av_log(avctx, AV_LOG_ERROR, "implicit_rect && used_rects > 0\n");
552  return AVERROR_INVALIDDATA;
553  }
554 
555  if (implicit_rect) {
556  wmv9rects[0].x = 0;
557  wmv9rects[0].y = 0;
558  wmv9rects[0].w = avctx->width;
559  wmv9rects[0].h = avctx->height;
560 
561  used_rects = 1;
562  }
563  for (i = 0; i < used_rects; i++) {
564  if (!implicit_rect && arith2_get_bit(&acoder)) {
565  av_log(avctx, AV_LOG_ERROR, "Unexpected grandchildren\n");
566  return AVERROR_INVALIDDATA;
567  }
568  if (!i) {
569  wmv9_mask = arith2_get_bit(&acoder) - 1;
570  if (!wmv9_mask)
571  wmv9_mask = arith2_get_number(&acoder, 256);
572  }
573  wmv9rects[i].coded = arith2_get_number(&acoder, 2);
574  }
575 
576  buf += arith2_get_consumed_bytes(&acoder);
577  buf_size -= arith2_get_consumed_bytes(&acoder);
578  if (buf_size < 1)
579  return AVERROR_INVALIDDATA;
580  }
581 
582  c->mvX = c->mvY = 0;
583  if (keyframe && !is_555) {
584  if ((i = decode_pal_v2(c, buf, buf_size)) < 0)
585  return AVERROR_INVALIDDATA;
586  buf += i;
587  buf_size -= i;
588  } else if (has_mv) {
589  buf += 4;
590  buf_size -= 4;
591  if (buf_size < 1)
592  return AVERROR_INVALIDDATA;
593  c->mvX = AV_RB16(buf - 4) - avctx->width;
594  c->mvY = AV_RB16(buf - 2) - avctx->height;
595  }
596 
597  if (c->mvX < 0 || c->mvY < 0) {
598  FFSWAP(uint8_t *, c->pal_pic, c->last_pal_pic);
599 
600  if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
601  return ret;
602 
603  if (ctx->last_pic->data[0]) {
604  av_assert0(frame->linesize[0] == ctx->last_pic->linesize[0]);
605  c->last_rgb_pic = ctx->last_pic->data[0] +
606  ctx->last_pic->linesize[0] * (avctx->height - 1);
607  } else {
608  av_log(avctx, AV_LOG_ERROR, "Missing keyframe\n");
609  return AVERROR_INVALIDDATA;
610  }
611  } else {
612  if ((ret = ff_reget_buffer(avctx, ctx->last_pic)) < 0)
613  return ret;
614  if ((ret = av_frame_ref(frame, ctx->last_pic)) < 0)
615  return ret;
616 
617  c->last_rgb_pic = NULL;
618  }
619  c->rgb_pic = frame->data[0] +
620  frame->linesize[0] * (avctx->height - 1);
621  c->rgb_stride = -frame->linesize[0];
622 
623  frame->key_frame = keyframe;
624  frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
625 
626  if (is_555) {
627  bytestream2_init(&gB, buf, buf_size);
628 
629  if (decode_555(&gB, (uint16_t *)c->rgb_pic, c->rgb_stride >> 1,
630  keyframe, avctx->width, avctx->height))
631  return AVERROR_INVALIDDATA;
632 
633  buf_size -= bytestream2_tell(&gB);
634  } else {
635  if (keyframe) {
636  c->corrupted = 0;
638  if (c->slice_split)
640  }
641  if (is_rle) {
642  if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
643  return ret;
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  ctx->last_pic = av_frame_alloc();
822  c->pal_stride = c->mask_stride;
823  c->pal_pic = av_mallocz(c->pal_stride * avctx->height);
824  c->last_pal_pic = av_mallocz(c->pal_stride * avctx->height);
825  if (!c->pal_pic || !c->last_pal_pic || !ctx->last_pic) {
826  mss2_decode_end(avctx);
827  return AVERROR(ENOMEM);
828  }
829  if (ret = wmv9_init(avctx)) {
830  mss2_decode_end(avctx);
831  return ret;
832  }
833  ff_mss2dsp_init(&ctx->dsp);
834  ff_qpeldsp_init(&ctx->qdsp);
835 
836  avctx->pix_fmt = c->free_colours == 127 ? AV_PIX_FMT_RGB555
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),
850  .close = mss2_decode_end,
852  .capabilities = AV_CODEC_CAP_DR1,
853 };
static av_cold int mss2_decode_init(AVCodecContext *avctx)
Definition: mss2.c:813
#define NULL
Definition: coverity.c:32
MSS12Context c
Definition: mss2.c:41
const char const char void * val
Definition: avisynth_c.h:634
float v
#define ARITH2_PADDING
Definition: mss2.c:461
qpel_mc_func avg_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:74
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static int arith2_get_scaled_value(int value, int n, int range)
Definition: mss2.c:66
QpelDSPContext qdsp
Definition: mss2.c:43
The VC1 Context.
Definition: vc1.h:173
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
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:235
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:260
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int ff_msmpeg4_decode_init(AVCodecContext *avctx)
Definition: msmpeg4dec.c:288
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:65
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:161
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
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:1779
int extended_mv
Ext MV in P/B (not in Simple)
Definition: vc1.h:223
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:76
int size
Definition: avcodec.h:1423
const char * b
Definition: vf_curves.c:109
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
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1721
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
int w
Definition: mss2.c:457
discard all
Definition: avcodec.h:688
int fastuvmc
Rounding of qpel vector to hpel ? (not in Simple)
Definition: vc1.h:222
int end_mb_x
Horizontal macroblock limit (used only by mss2)
Definition: vc1.h:393
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
uint8_t * rgb_pic
Definition: mss12.h:83
int mask_stride
Definition: mss12.h:82
QpelDSPContext qdsp
Definition: mpegvideo.h:242
AVCodec.
Definition: avcodec.h:3473
int frmrtq_postproc
3bits,
Definition: vc1.h:219
int ff_mss12_decode_rect(SliceContext *sc, ArithCoder *acoder, int x, int y, int width, int height)
Definition: mss12.c:528
int bits
Definition: vc1.h:179
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:188
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:295
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:74
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:135
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:1576
qpel_mc_func(* qpel_put)[16]
Definition: motion_est.h:85
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:363
int coded
Definition: mss2.c:457
int split_position
Definition: mss2.c:39
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:187
static AVFrame * frame
quarterpel DSP functions
int profile
Sequence header data for all Profiles TODO: choose between ints, uint8_ts and monobit flags...
Definition: vc1.h:218
MSMPEG4 data tables.
uint8_t * data
Definition: avcodec.h:1422
GetByteContext * gB
Definition: mss12.h:52
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:212
int ff_vc1_decode_end(AVCodecContext *avctx)
Close a VC1/WMV3 decoder.
Definition: vc1dec.c:579
#define av_log(a,...)
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:94
int h
Definition: mss2.c:457
static int arith2_get_prob(ArithCoder *c, int16_t *probs)
Definition: mss2.c:114
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:176
av_cold void ff_mss2dsp_init(MSS2DSPContext *dsp)
Definition: mss2dsp.c:150
int res_y411
reserved, old interlaced mode
Definition: vc1.h:184
int overlap
overlapped transforms in use
Definition: vc1.h:226
int res_x8
reserved
Definition: vc1.h:185
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:372
#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:148
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
ERContext er
Definition: mpegvideo.h:553
const char * r
Definition: vf_curves.c:107
#define ARITH_GET_MODEL_SYM(prefix)
Definition: mss12.h:118
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: vc1_block.c:2929
const char * name
Name of the codec implementation.
Definition: avcodec.h:3480
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_RL24
Definition: bytestream.h:87
qpel_mc_func put_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:73
GetBitContext gb
Definition: mpegvideo.h:451
int resync_marker
could this stream contain resync markers
Definition: vc1.h:396
const uint8_t * zz_8x4
Zigzag scan table for TT_8x4 coding mode.
Definition: vc1.h:241
int res_rtm_flag
reserved, set to 1
Definition: vc1.h:191
int pal_stride
Definition: mss12.h:80
const uint8_t ff_wmv2_scantableB[64]
Definition: msmpeg4data.c:1994
Definition: get_bits.h:63
static char * split(char *message, char delim)
Definition: af_channelmap.c:81
static void arith2_init(ArithCoder *c, GetByteContext *gB)
Definition: mss2.c:150
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2753
AVCodecContext * avctx
Definition: mss12.h:76
const uint8_t * zz_4x8
Zigzag scan table for TT_4x8 coding mode.
Definition: vc1.h:242
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:1087
SliceContext sc[2]
Definition: mss2.c:44
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:242
#define FFMIN(a, b)
Definition: common.h:66
float y
ret
Definition: avfilter.c:974
int width
picture width / height.
Definition: avcodec.h:1680
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
void ff_mpeg_er_frame_start(MpegEncContext *s)
Definition: mpeg_er.c:46
#define AV_WB24(p, d)
Definition: intreadwrite.h:450
int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext *gb)
Definition: vc1.c:628
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:555
static int decode_555(GetByteContext *gB, uint16_t *dst, int stride, int keyframe, int w, int h)
Definition: mss2.c:177
MotionEstContext me
Definition: mpegvideo.h:290
int n
Definition: avisynth_c.h:547
static int arith2_get_consumed_bytes(ArithCoder *c)
Definition: mss2.c:136
union ArithCoder::@74 gbc
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:188
int rangered
RANGEREDFRM (range reduction) syntax element present at frame level.
Definition: vc1.h:189
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:232
int finterpflag
INTERPFRM present.
Definition: vc1.h:228
av_cold int ff_mss12_decode_end(MSS12Context *c)
Definition: mss12.c:676
int res_sprite
Simple/Main Profile sequence header.
Definition: vc1.h:183
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_RB24
Definition: bytestream.h:87
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:199
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:441
int multires
frame-level RESPIC syntax element present
Definition: vc1.h:186
main external API structure.
Definition: avcodec.h:1501
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:1040
#define init_vlc(vlc, nb_bits, nb_codes,bits, bits_wrap, bits_size,codes, codes_wrap, codes_size,flags)
Definition: get_bits.h:457
void * buf
Definition: avisynth_c.h:553
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:304
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:297
struct AVFrame * f
Definition: mpegpicture.h:46
uint8_t respic
Frame-level flag for resized images.
Definition: vc1.h:274
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:1180
int quantizer_mode
2bits, quantizer mode used for sequence, see QUANT_*
Definition: vc1.h:227
int max_b_frames
max number of b-frames for encoding
Definition: mpegvideo.h:122
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:219
quarterpel DSP context
Definition: qpeldsp.h:72
#define MAX_WMV9_RECTANGLES
Definition: mss2.c:460
int vstransform
variable-size [48]x[48] transform type + info
Definition: vc1.h:225
#define MIN_CACHE_BITS
Definition: get_bits.h:125
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:462
AVCodec ff_mss2_decoder
Definition: mss2.c:843
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:182
qpel_mc_func(* qpel_avg)[16]
Definition: motion_est.h:86
MpegEncContext s
Definition: vc1.h:174
VC1Context v
Definition: mss2.c:38
MpegEncContext.
Definition: mpegvideo.h:88
void ff_vc1_init_transposed_scantables(VC1Context *v)
Definition: vc1dec.c:399
struct AVCodecContext * avctx
Definition: mpegvideo.h:105
int y
Definition: mss2.c:457
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:522
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:63
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
static double c[64]
int res_fasttx
reserved, always 1
Definition: vc1.h:187
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:354
enum AVDiscard skip_loop_filter
Skip loop filtering for selected frames.
Definition: avcodec.h:3213
Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder DSP routines.
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:635
int free_colours
Definition: mss12.h:86
void * priv_data
Definition: avcodec.h:1543
static av_always_inline int diff(const uint32_t a, const uint32_t b)
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1411
#define av_log2
Definition: intmath.h:105
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:65
int low
Definition: mss12.h:49
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:237
uint8_t * last_rgb_pic
Definition: mss12.h:84
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:449
int bitrtq_postproc
5bits, quantized framerate-based postprocessing strength
Definition: vc1.h:220
AVFrame * last_pic
Definition: mss2.c:40
static int decode_pal_v2(MSS12Context *ctx, const uint8_t *buf, int buf_size)
Definition: mss2.c:160
#define av_uninit(x)
Definition: attributes.h:141
#define ARITH_GET_BIT(prefix)
Definition: mss12.h:102
int ff_vc1_decode_init_alloc_tables(VC1Context *v)
Definition: vc1dec.c:323
static void arith2_normalise(ArithCoder *c)
Definition: mss2.c:47
#define av_freep(p)
#define READ_PAIR(a, b)
MSS2DSPContext dsp
Definition: mss2.c:42
static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: mss2.c:463
int dquant
How qscale varies with MBs, 2bits (not in Simple)
Definition: vc1.h:224
int mvX
Definition: mss12.h:88
av_cold void ff_qpeldsp_init(QpelDSPContext *c)
Definition: qpeldsp.c:783
#define FFSWAP(type, a, b)
Definition: common.h:69
#define stride
int(* get_number)(struct ArithCoder *c, int n)
Definition: mss12.h:55
This structure stores compressed data.
Definition: avcodec.h:1399
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:359
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:1215
av_cold void ff_vc1dsp_init(VC1DSPContext *dsp)
Definition: vc1dsp.c:969
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:252
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:856
uint8_t * pal_pic
Definition: mss12.h:78
VC1DSPContext vc1dsp
Definition: vc1.h:177
Predicted.
Definition: avutil.h:275
Common header for Microsoft Screen 1 and 2.
int x
Definition: mss2.c:457