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 "msmpeg4.h"
31 #include "qpeldsp.h"
32 #include "vc1.h"
33 #include "wmv2data.h"
34 #include "mss12.h"
35 #include "mss2dsp.h"
36 
37 typedef struct MSS2Context {
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 = c->high << 8 & 0xFFFFFF | 0xFF;
56  c->value = c->value << 8 & 0xFFFFFF | bytestream2_get_byte(c->gbc.gB);
57  c->low = c->low << 8 & 0xFFFFFF;
58  }
59 }
60 
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 
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))
322  return i;
323 
324  /* frame decode */
325  do {
326  uint8_t *pp = pal_dst;
327  uint8_t *rp = rgb_dst;
328  do {
329  if (repeat-- < 1) {
330  int b = get_vlc2(gb, vlc.table, 9, 3);
331  if (b < 256)
332  last_symbol = b;
333  else if (b < 268) {
334  b -= 256;
335  if (b == 11)
336  b = get_bits(gb, 4) + 10;
337 
338  if (!b)
339  repeat = 0;
340  else
341  repeat = get_bits(gb, b);
342 
343  repeat += (1 << b) - 1;
344 
345  if (last_symbol == -2) {
346  int skip = FFMIN(repeat, pal_dst + w - pp);
347  repeat -= skip;
348  pp += skip;
349  rp += skip * 3;
350  }
351  } else
352  last_symbol = 267 - b;
353  }
354  if (last_symbol >= 0) {
355  *pp = last_symbol;
356  AV_WB24(rp, pal[last_symbol]);
357  } else if (last_symbol == -1 && prev_avail) {
358  *pp = *(pp - pal_stride);
359  memcpy(rp, rp - rgb_stride, 3);
360  }
361  rp += 3;
362  } while (++pp < pal_dst + w);
363  pal_dst += pal_stride;
364  rgb_dst += rgb_stride;
365  prev_avail = 1;
366  } while (--h);
367 
368  ff_free_vlc(&vlc);
369  return 0;
370 }
371 
372 static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size,
373  int x, int y, int w, int h, int wmv9_mask)
374 {
375  MSS2Context *ctx = avctx->priv_data;
376  MSS12Context *c = &ctx->c;
377  VC1Context *v = avctx->priv_data;
378  MpegEncContext *s = &v->s;
379  AVFrame *f;
380  int ret;
381 
382  ff_mpeg_flush(avctx);
383 
384  init_get_bits(&s->gb, buf, buf_size * 8);
385 
387 
388  if (ff_vc1_parse_frame_header(v, &s->gb) < 0) {
389  av_log(v->s.avctx, AV_LOG_ERROR, "header error\n");
390  return AVERROR_INVALIDDATA;
391  }
392 
393  if (s->pict_type != AV_PICTURE_TYPE_I) {
394  av_log(v->s.avctx, AV_LOG_ERROR, "expected I-frame\n");
395  return AVERROR_INVALIDDATA;
396  }
397 
398  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
399 
400  if ((ret = ff_mpv_frame_start(s, avctx)) < 0) {
401  av_log(v->s.avctx, AV_LOG_ERROR, "ff_mpv_frame_start error\n");
402  avctx->pix_fmt = AV_PIX_FMT_RGB24;
403  return ret;
404  }
405 
407 
408  v->bits = buf_size * 8;
409 
410  v->end_mb_x = (w + 15) >> 4;
411  s->end_mb_y = (h + 15) >> 4;
412  if (v->respic & 1)
413  v->end_mb_x = v->end_mb_x + 1 >> 1;
414  if (v->respic & 2)
415  s->end_mb_y = s->end_mb_y + 1 >> 1;
416 
418 
419  if (v->end_mb_x == s->mb_width && s->end_mb_y == s->mb_height) {
420  ff_er_frame_end(&s->er);
421  } else {
423  "disabling error correction due to block count mismatch %dx%d != %dx%d\n",
424  v->end_mb_x, s->end_mb_y, s->mb_width, s->mb_height);
425  }
426 
427  ff_mpv_frame_end(s);
428 
429  f = s->current_picture.f;
430 
431  if (v->respic == 3) {
432  ctx->dsp.upsample_plane(f->data[0], f->linesize[0], w, h);
433  ctx->dsp.upsample_plane(f->data[1], f->linesize[1], w >> 1, h >> 1);
434  ctx->dsp.upsample_plane(f->data[2], f->linesize[2], w >> 1, h >> 1);
435  } else if (v->respic)
437  "Asymmetric WMV9 rectangle subsampling");
438 
439  av_assert0(f->linesize[1] == f->linesize[2]);
440 
441  if (wmv9_mask != -1)
442  ctx->dsp.mss2_blit_wmv9_masked(c->rgb_pic + y * c->rgb_stride + x * 3,
443  c->rgb_stride, wmv9_mask,
444  c->pal_pic + y * c->pal_stride + x,
445  c->pal_stride,
446  f->data[0], f->linesize[0],
447  f->data[1], f->data[2], f->linesize[1],
448  w, h);
449  else
450  ctx->dsp.mss2_blit_wmv9(c->rgb_pic + y * c->rgb_stride + x * 3,
451  c->rgb_stride,
452  f->data[0], f->linesize[0],
453  f->data[1], f->data[2], f->linesize[1],
454  w, h);
455 
456  avctx->pix_fmt = AV_PIX_FMT_RGB24;
457 
458  return 0;
459 }
460 
461 typedef struct Rectangle {
462  int coded, x, y, w, h;
463 } Rectangle;
464 
465 #define MAX_WMV9_RECTANGLES 20
466 #define ARITH2_PADDING 2
467 
468 static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
469  AVPacket *avpkt)
470 {
471  const uint8_t *buf = avpkt->data;
472  int buf_size = avpkt->size;
473  MSS2Context *ctx = avctx->priv_data;
474  MSS12Context *c = &ctx->c;
475  AVFrame *frame = data;
476  GetBitContext gb;
477  GetByteContext gB;
478  ArithCoder acoder;
479 
480  int keyframe, has_wmv9, has_mv, is_rle, is_555, ret;
481 
482  Rectangle wmv9rects[MAX_WMV9_RECTANGLES], *r;
483  int used_rects = 0, i, implicit_rect = 0, av_uninit(wmv9_mask);
484 
485  init_get_bits(&gb, buf, buf_size * 8);
486 
487  if (keyframe = get_bits1(&gb))
488  skip_bits(&gb, 7);
489  has_wmv9 = get_bits1(&gb);
490  has_mv = keyframe ? 0 : get_bits1(&gb);
491  is_rle = get_bits1(&gb);
492  is_555 = is_rle && get_bits1(&gb);
493  if (c->slice_split > 0)
494  ctx->split_position = c->slice_split;
495  else if (c->slice_split < 0) {
496  if (get_bits1(&gb)) {
497  if (get_bits1(&gb)) {
498  if (get_bits1(&gb))
499  ctx->split_position = get_bits(&gb, 16);
500  else
501  ctx->split_position = get_bits(&gb, 12);
502  } else
503  ctx->split_position = get_bits(&gb, 8) << 4;
504  } else {
505  if (keyframe)
506  ctx->split_position = avctx->height / 2;
507  }
508  } else
509  ctx->split_position = avctx->height;
510 
511  if (c->slice_split && (ctx->split_position < 1 - is_555 ||
512  ctx->split_position > avctx->height - 1))
513  return AVERROR_INVALIDDATA;
514 
515  align_get_bits(&gb);
516  buf += get_bits_count(&gb) >> 3;
517  buf_size -= get_bits_count(&gb) >> 3;
518 
519  if (buf_size < 1)
520  return AVERROR_INVALIDDATA;
521 
522  if (is_555 && (has_wmv9 || has_mv || c->slice_split && ctx->split_position))
523  return AVERROR_INVALIDDATA;
524 
525  avctx->pix_fmt = is_555 ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_RGB24;
526  if (ctx->last_pic->format != avctx->pix_fmt)
527  av_frame_unref(ctx->last_pic);
528 
529  if (has_wmv9) {
530  bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
531  arith2_init(&acoder, &gB);
532 
533  implicit_rect = !arith2_get_bit(&acoder);
534 
535  while (arith2_get_bit(&acoder)) {
536  if (used_rects == MAX_WMV9_RECTANGLES)
537  return AVERROR_INVALIDDATA;
538  r = &wmv9rects[used_rects];
539  if (!used_rects)
540  r->x = arith2_get_number(&acoder, avctx->width);
541  else
542  r->x = arith2_get_number(&acoder, avctx->width -
543  wmv9rects[used_rects - 1].x) +
544  wmv9rects[used_rects - 1].x;
545  r->y = arith2_get_number(&acoder, avctx->height);
546  r->w = arith2_get_number(&acoder, avctx->width - r->x) + 1;
547  r->h = arith2_get_number(&acoder, avctx->height - r->y) + 1;
548  used_rects++;
549  }
550 
551  if (implicit_rect && used_rects) {
552  av_log(avctx, AV_LOG_ERROR, "implicit_rect && used_rects > 0\n");
553  return AVERROR_INVALIDDATA;
554  }
555 
556  if (implicit_rect) {
557  wmv9rects[0].x = 0;
558  wmv9rects[0].y = 0;
559  wmv9rects[0].w = avctx->width;
560  wmv9rects[0].h = avctx->height;
561 
562  used_rects = 1;
563  }
564  for (i = 0; i < used_rects; i++) {
565  if (!implicit_rect && arith2_get_bit(&acoder)) {
566  av_log(avctx, AV_LOG_ERROR, "Unexpected grandchildren\n");
567  return AVERROR_INVALIDDATA;
568  }
569  if (!i) {
570  wmv9_mask = arith2_get_bit(&acoder) - 1;
571  if (!wmv9_mask)
572  wmv9_mask = arith2_get_number(&acoder, 256);
573  }
574  wmv9rects[i].coded = arith2_get_number(&acoder, 2);
575  }
576 
577  buf += arith2_get_consumed_bytes(&acoder);
578  buf_size -= arith2_get_consumed_bytes(&acoder);
579  if (buf_size < 1)
580  return AVERROR_INVALIDDATA;
581  }
582 
583  c->mvX = c->mvY = 0;
584  if (keyframe && !is_555) {
585  if ((i = decode_pal_v2(c, buf, buf_size)) < 0)
586  return AVERROR_INVALIDDATA;
587  buf += i;
588  buf_size -= i;
589  } else if (has_mv) {
590  buf += 4;
591  buf_size -= 4;
592  if (buf_size < 1)
593  return AVERROR_INVALIDDATA;
594  c->mvX = AV_RB16(buf - 4) - avctx->width;
595  c->mvY = AV_RB16(buf - 2) - avctx->height;
596  }
597 
598  if (c->mvX < 0 || c->mvY < 0) {
599  FFSWAP(uint8_t *, c->pal_pic, c->last_pal_pic);
600 
601  if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) {
602  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
603  return ret;
604  }
605 
606  if (ctx->last_pic->data[0]) {
607  av_assert0(frame->linesize[0] == ctx->last_pic->linesize[0]);
608  c->last_rgb_pic = ctx->last_pic->data[0] +
609  ctx->last_pic->linesize[0] * (avctx->height - 1);
610  } else {
611  av_log(avctx, AV_LOG_ERROR, "Missing keyframe\n");
612  return AVERROR_INVALIDDATA;
613  }
614  } else {
615  if ((ret = ff_reget_buffer(avctx, ctx->last_pic)) < 0) {
616  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
617  return ret;
618  }
619  if ((ret = av_frame_ref(frame, ctx->last_pic)) < 0)
620  return ret;
621 
622  c->last_rgb_pic = NULL;
623  }
624  c->rgb_pic = frame->data[0] +
625  frame->linesize[0] * (avctx->height - 1);
626  c->rgb_stride = -frame->linesize[0];
627 
628  frame->key_frame = keyframe;
629  frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
630 
631  if (is_555) {
632  bytestream2_init(&gB, buf, buf_size);
633 
634  if (decode_555(&gB, (uint16_t *)c->rgb_pic, c->rgb_stride >> 1,
635  keyframe, avctx->width, avctx->height))
636  return AVERROR_INVALIDDATA;
637 
638  buf_size -= bytestream2_tell(&gB);
639  } else {
640  if (keyframe) {
641  c->corrupted = 0;
643  if (c->slice_split)
645  }
646  if (is_rle) {
647  init_get_bits(&gb, buf, buf_size * 8);
648  if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
649  c->rgb_pic, c->rgb_stride, c->pal, keyframe,
650  ctx->split_position, 0,
651  avctx->width, avctx->height))
652  return ret;
653  align_get_bits(&gb);
654 
655  if (c->slice_split)
656  if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
657  c->rgb_pic, c->rgb_stride, c->pal, keyframe,
658  ctx->split_position, 1,
659  avctx->width, avctx->height))
660  return ret;
661 
662  align_get_bits(&gb);
663  buf += get_bits_count(&gb) >> 3;
664  buf_size -= get_bits_count(&gb) >> 3;
665  } else if (!implicit_rect || wmv9_mask != -1) {
666  if (c->corrupted)
667  return AVERROR_INVALIDDATA;
668  bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
669  arith2_init(&acoder, &gB);
670  c->keyframe = keyframe;
671  if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[0], &acoder, 0, 0,
672  avctx->width,
673  ctx->split_position))
674  return AVERROR_INVALIDDATA;
675 
676  buf += arith2_get_consumed_bytes(&acoder);
677  buf_size -= arith2_get_consumed_bytes(&acoder);
678  if (c->slice_split) {
679  if (buf_size < 1)
680  return AVERROR_INVALIDDATA;
681  bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
682  arith2_init(&acoder, &gB);
683  if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[1], &acoder, 0,
684  ctx->split_position,
685  avctx->width,
686  avctx->height - ctx->split_position))
687  return AVERROR_INVALIDDATA;
688 
689  buf += arith2_get_consumed_bytes(&acoder);
690  buf_size -= arith2_get_consumed_bytes(&acoder);
691  }
692  } else
693  memset(c->pal_pic, 0, c->pal_stride * avctx->height);
694  }
695 
696  if (has_wmv9) {
697  for (i = 0; i < used_rects; i++) {
698  int x = wmv9rects[i].x;
699  int y = wmv9rects[i].y;
700  int w = wmv9rects[i].w;
701  int h = wmv9rects[i].h;
702  if (wmv9rects[i].coded) {
703  int WMV9codedFrameSize;
704  if (buf_size < 4 || !(WMV9codedFrameSize = AV_RL24(buf)))
705  return AVERROR_INVALIDDATA;
706  if (ret = decode_wmv9(avctx, buf + 3, buf_size - 3,
707  x, y, w, h, wmv9_mask))
708  return ret;
709  buf += WMV9codedFrameSize + 3;
710  buf_size -= WMV9codedFrameSize + 3;
711  } else {
712  uint8_t *dst = c->rgb_pic + y * c->rgb_stride + x * 3;
713  if (wmv9_mask != -1) {
714  ctx->dsp.mss2_gray_fill_masked(dst, c->rgb_stride,
715  wmv9_mask,
716  c->pal_pic + y * c->pal_stride + x,
717  c->pal_stride,
718  w, h);
719  } else {
720  do {
721  memset(dst, 0x80, w * 3);
722  dst += c->rgb_stride;
723  } while (--h);
724  }
725  }
726  }
727  }
728 
729  if (buf_size)
730  av_log(avctx, AV_LOG_WARNING, "buffer not fully consumed\n");
731 
732  if (c->mvX < 0 || c->mvY < 0) {
733  av_frame_unref(ctx->last_pic);
734  ret = av_frame_ref(ctx->last_pic, frame);
735  if (ret < 0)
736  return ret;
737  }
738 
739  *got_frame = 1;
740 
741  return avpkt->size;
742 }
743 
744 static av_cold int wmv9_init(AVCodecContext *avctx)
745 {
746  VC1Context *v = avctx->priv_data;
747  int ret;
748 
749  v->s.avctx = avctx;
750 
751  if ((ret = ff_vc1_init_common(v)) < 0)
752  return ret;
753  ff_vc1dsp_init(&v->vc1dsp);
754 
755  v->profile = PROFILE_MAIN;
756 
759  v->res_y411 = 0;
760  v->res_sprite = 0;
761 
762  v->frmrtq_postproc = 7;
763  v->bitrtq_postproc = 31;
764 
765  v->res_x8 = 0;
766  v->multires = 0;
767  v->res_fasttx = 1;
768 
769  v->fastuvmc = 0;
770 
771  v->extended_mv = 0;
772 
773  v->dquant = 1;
774  v->vstransform = 1;
775 
776  v->res_transtab = 0;
777 
778  v->overlap = 0;
779 
780  v->resync_marker = 0;
781  v->rangered = 0;
782 
783  v->s.max_b_frames = avctx->max_b_frames = 0;
784  v->quantizer_mode = 0;
785 
786  v->finterpflag = 0;
787 
788  v->res_rtm_flag = 1;
789 
791 
792  if ((ret = ff_msmpeg4_decode_init(avctx)) < 0 ||
793  (ret = ff_vc1_decode_init_alloc_tables(v)) < 0)
794  return ret;
795 
796  /* error concealment */
799 
800  return 0;
801 }
802 
804 {
805  MSS2Context *const ctx = avctx->priv_data;
806 
807  av_frame_free(&ctx->last_pic);
808 
809  ff_mss12_decode_end(&ctx->c);
810  av_freep(&ctx->c.pal_pic);
811  av_freep(&ctx->c.last_pal_pic);
812  ff_vc1_decode_end(avctx);
813 
814  return 0;
815 }
816 
818 {
819  MSS2Context * const ctx = avctx->priv_data;
820  MSS12Context *c = &ctx->c;
821  int ret;
822  c->avctx = avctx;
823  if (ret = ff_mss12_decode_init(c, 1, &ctx->sc[0], &ctx->sc[1]))
824  return ret;
825  c->pal_stride = c->mask_stride;
826  c->pal_pic = av_mallocz(c->pal_stride * avctx->height);
827  c->last_pal_pic = av_mallocz(c->pal_stride * avctx->height);
828  if (!c->pal_pic || !c->last_pal_pic) {
829  mss2_decode_end(avctx);
830  return AVERROR(ENOMEM);
831  }
832  if (ret = wmv9_init(avctx)) {
833  mss2_decode_end(avctx);
834  return ret;
835  }
836  ff_mss2dsp_init(&ctx->dsp);
837  ff_qpeldsp_init(&ctx->qdsp);
838 
839  avctx->pix_fmt = c->free_colours == 127 ? AV_PIX_FMT_RGB555
841 
842  ctx->last_pic = av_frame_alloc();
843  if (!ctx->last_pic) {
844  mss2_decode_end(avctx);
845  return AVERROR(ENOMEM);
846  }
847 
848  return 0;
849 }
850 
852  .name = "mss2",
853  .long_name = NULL_IF_CONFIG_SMALL("MS Windows Media Video V9 Screen"),
854  .type = AVMEDIA_TYPE_VIDEO,
855  .id = AV_CODEC_ID_MSS2,
856  .priv_data_size = sizeof(MSS2Context),
858  .close = mss2_decode_end,
860  .capabilities = AV_CODEC_CAP_DR1,
861 };
#define ARITH_GET_BIT(VERSION)
Definition: mss12.h:102
static av_cold int mss2_decode_init(AVCodecContext *avctx)
Definition: mss2.c:817
MSS12Context c
Definition: mss2.c:41
#define ARITH2_PADDING
Definition: mss2.c:466
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:66
QpelDSPContext qdsp
Definition: mss2.c:43
The VC1 Context.
Definition: vc1.h:158
This structure describes decoded (raw) audio or video data.
Definition: frame.h:140
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(* get_number)(struct ArithCoder *c, int n)
Definition: mss12.h:55
const uint8_t ff_wmv2_scantableB[64]
Definition: wmv2data.c:30
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:228
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:130
int ff_msmpeg4_decode_init(AVCodecContext *avctx)
Definition: msmpeg4dec.c:282
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:61
int(* get_model_sym)(struct ArithCoder *c, Model *m)
Definition: mss12.h:54
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:149
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:1679
int extended_mv
Ext MV in P/B (not in Simple)
Definition: vc1.h:207
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:1347
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic ? ac->func_descr_generic :ac->func_descr)
#define AV_RB24
Definition: intreadwrite.h:64
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1621
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:462
discard all
Definition: avcodec.h:689
int fastuvmc
Rounding of qpel vector to hpel ? (not in Simple)
Definition: vc1.h:206
#define init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, codes, codes_wrap, codes_size, flags)
Definition: vlc.h:38
int end_mb_x
Horizontal macroblock limit (used only by mss2)
Definition: vc1.h:377
uint8_t * rgb_pic
Definition: mss12.h:83
int mask_stride
Definition: mss12.h:82
QpelDSPContext qdsp
Definition: mpegvideo.h:226
int stride
Definition: mace.c:144
AVCodec.
Definition: avcodec.h:3120
int frmrtq_postproc
3 bits
Definition: vc1.h:204
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:202
int bits
Definition: vc1.h:164
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:173
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:252
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:68
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:1564
#define b
Definition: input.c:52
qpel_mc_func(* qpel_put)[16]
Definition: motion_est.h:86
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:199
int coded
Definition: mss2.c:462
int split_position
Definition: mss2.c:39
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:175
quarterpel DSP functions
int profile
Sequence header data for all Profiles TODO: choose between ints, uint8_ts and monobit flags...
Definition: vc1.h:203
const char data[16]
Definition: mxf.c:70
uint8_t * data
Definition: avcodec.h:1346
GetByteContext * gB
Definition: mss12.h:52
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:182
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:124
int ff_vc1_decode_end(AVCodecContext *avctx)
Close a VC1/WMV3 decoder.
Definition: vc1dec.c:553
static int arith2_get_number(ArithCoder *c, int n)
Definition: mss2.c:94
int h
Definition: mss2.c:462
#define r
Definition: input.c:51
static int arith2_get_prob(ArithCoder *c, int16_t *probs)
Definition: mss2.c:114
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
static av_cold int wmv9_init(AVCodecContext *avctx)
Definition: mss2.c:744
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
av_cold void ff_mss2dsp_init(MSS2DSPContext *dsp)
Definition: mss2dsp.c:147
int res_y411
reserved, old interlaced mode
Definition: vc1.h:169
int overlap
overlapped transforms in use
Definition: vc1.h:210
int res_x8
reserved
Definition: vc1.h:170
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 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:80
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:148
ERContext er
Definition: mpegvideo.h:528
int mvY
Definition: mss12.h:88
simple assert() macros that are a bit more flexible than ISO C assert().
void ff_vc1_decode_blocks(VC1Context *v)
Definition: vc1_block.c:3020
const char * name
Name of the codec implementation.
Definition: avcodec.h:3127
qpel_mc_func put_qpel_pixels_tab[2][16]
Definition: qpeldsp.h:73
GetBitContext gb
Definition: mpegvideo.h:431
int resync_marker
could this stream contain resync markers
Definition: vc1.h:380
const uint8_t ff_wmv2_scantableA[64]
Definition: wmv2data.c:23
const uint8_t * zz_8x4
Zigzag scan table for TT_8x4 coding mode.
Definition: vc1.h:225
int res_rtm_flag
reserved, set to 1
Definition: vc1.h:176
int pal_stride
Definition: mss12.h:80
Definition: vlc.h:26
static char * split(char *message, char delim)
Definition: af_channelmap.c:85
static void arith2_init(ArithCoder *c, GetByteContext *gB)
Definition: mss2.c:150
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:1776
AVCodecContext * avctx
Definition: mss12.h:76
const uint8_t * zz_4x8
Zigzag scan table for TT_4x8 coding mode.
Definition: vc1.h:226
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:672
SliceContext sc[2]
Definition: mss2.c:44
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:201
#define FFMIN(a, b)
Definition: common.h:66
int width
picture width / height.
Definition: avcodec.h:1580
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: avconv.c:1288
void ff_mpeg_er_frame_start(MpegEncContext *s)
Definition: mpeg_er.c:45
AVFormatContext * ctx
Definition: movenc.c:48
#define AV_WB24(p, d)
Definition: intreadwrite.h:423
int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext *gb)
Definition: vc1.c:620
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:493
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:276
static int arith2_get_consumed_bytes(ArithCoder *c)
Definition: mss2.c:136
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
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:174
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:191
int finterpflag
INTERPFRM present.
Definition: vc1.h:212
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:168
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:158
int multires
frame-level RESPIC syntax element present
Definition: vc1.h:171
main external API structure.
Definition: avcodec.h:1409
static av_cold int mss2_decode_end(AVCodecContext *avctx)
Definition: mss2.c:803
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:589
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:267
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:259
struct AVFrame * f
Definition: mpegpicture.h:46
void(* upsample_plane)(uint8_t *plane, int plane_stride, int w, int h)
Definition: mss2dsp.h:45
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:362
uint8_t respic
Frame-level flag for resized images.
Definition: vc1.h:258
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:1052
int quantizer_mode
2 bits, quantizer mode used for sequence, see QUANT_*
Definition: vc1.h:211
int max_b_frames
max number of B-frames for encoding
Definition: mpegvideo.h:110
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:206
quarterpel DSP context
Definition: qpeldsp.h:72
#define MAX_WMV9_RECTANGLES
Definition: mss2.c:465
int vstransform
variable-size [48]x[48] transform type + info
Definition: vc1.h:209
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:302
AVCodec ff_mss2_decoder
Definition: mss2.c:851
#define AV_RL24
Definition: intreadwrite.h:78
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:146
qpel_mc_func(* qpel_avg)[16]
Definition: motion_est.h:87
MpegEncContext s
Definition: vc1.h:159
VC1Context v
Definition: mss2.c:38
MpegEncContext.
Definition: mpegvideo.h:76
void ff_vc1_init_transposed_scantables(VC1Context *v)
Definition: vc1dec.c:395
struct AVCodecContext * avctx
Definition: mpegvideo.h:93
int y
Definition: mss2.c:462
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:59
common internal api header.
void ff_mss12_slicecontext_reset(SliceContext *sc)
Definition: mss12.c:428
int res_fasttx
reserved, always 1
Definition: vc1.h:172
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:251
enum AVDiscard skip_loop_filter
Definition: avcodec.h:2977
Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder DSP routines.
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:582
int free_colours
Definition: mss12.h:86
void * priv_data
Definition: avcodec.h:1451
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1263
#define av_log2
Definition: intmath.h:85
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
int low
Definition: mss12.h:49
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:196
uint8_t * last_rgb_pic
Definition: mss12.h:84
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:403
int bitrtq_postproc
5 bits, quantized framerate-based postprocessing strength
Definition: vc1.h:205
AVFrame * last_pic
Definition: mss2.c:40
#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:160
union ArithCoder::@54 gbc
#define av_uninit(x)
Definition: attributes.h:109
int ff_vc1_decode_init_alloc_tables(VC1Context *v)
Definition: vc1dec.c:314
static void arith2_normalise(ArithCoder *c)
Definition: mss2.c:47
#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:468
int dquant
How qscale varies with MBs, 2 bits (not in Simple)
Definition: vc1.h:208
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:69
This structure stores compressed data.
Definition: avcodec.h:1323
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:334
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:1183
av_cold void ff_vc1dsp_init(VC1DSPContext *dsp)
Definition: vc1dsp.c:881
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:211
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:838
uint8_t * pal_pic
Definition: mss12.h:78
VC1DSPContext vc1dsp
Definition: vc1.h:162
Predicted.
Definition: avutil.h:261
Common header for Microsoft Screen 1 and 2.
int x
Definition: mss2.c:462