FFmpeg  3.4.9
wmv2dec.c
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1 /*
2  * Copyright (c) 2002 The FFmpeg Project
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 #include "avcodec.h"
22 #include "h263.h"
23 #include "internal.h"
24 #include "intrax8.h"
25 #include "mathops.h"
26 #include "mpegutils.h"
27 #include "mpegvideo.h"
28 #include "msmpeg4.h"
29 #include "msmpeg4data.h"
30 #include "wmv2.h"
31 
32 
33 static int parse_mb_skip(Wmv2Context *w)
34 {
35  int mb_x, mb_y;
36  MpegEncContext *const s = &w->s;
37  uint32_t *const mb_type = s->current_picture_ptr->mb_type;
38 
39  w->skip_type = get_bits(&s->gb, 2);
40  switch (w->skip_type) {
41  case SKIP_TYPE_NONE:
42  for (mb_y = 0; mb_y < s->mb_height; mb_y++)
43  for (mb_x = 0; mb_x < s->mb_width; mb_x++)
44  mb_type[mb_y * s->mb_stride + mb_x] =
46  break;
47  case SKIP_TYPE_MPEG:
48  if (get_bits_left(&s->gb) < s->mb_height * s->mb_width)
49  return AVERROR_INVALIDDATA;
50  for (mb_y = 0; mb_y < s->mb_height; mb_y++)
51  for (mb_x = 0; mb_x < s->mb_width; mb_x++)
52  mb_type[mb_y * s->mb_stride + mb_x] =
54  break;
55  case SKIP_TYPE_ROW:
56  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
57  if (get_bits_left(&s->gb) < 1)
58  return AVERROR_INVALIDDATA;
59  if (get_bits1(&s->gb)) {
60  for (mb_x = 0; mb_x < s->mb_width; mb_x++)
61  mb_type[mb_y * s->mb_stride + mb_x] =
63  } else {
64  for (mb_x = 0; mb_x < s->mb_width; mb_x++)
65  mb_type[mb_y * s->mb_stride + mb_x] =
67  }
68  }
69  break;
70  case SKIP_TYPE_COL:
71  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
72  if (get_bits_left(&s->gb) < 1)
73  return AVERROR_INVALIDDATA;
74  if (get_bits1(&s->gb)) {
75  for (mb_y = 0; mb_y < s->mb_height; mb_y++)
76  mb_type[mb_y * s->mb_stride + mb_x] =
78  } else {
79  for (mb_y = 0; mb_y < s->mb_height; mb_y++)
80  mb_type[mb_y * s->mb_stride + mb_x] =
82  }
83  }
84  break;
85  }
86  return 0;
87 }
88 
90 {
91  MpegEncContext *const s = &w->s;
92  GetBitContext gb;
93  int fps;
94  int code;
95 
96  if (s->avctx->extradata_size < 4)
97  return AVERROR_INVALIDDATA;
98 
99  init_get_bits(&gb, s->avctx->extradata, 32);
100 
101  fps = get_bits(&gb, 5);
102  s->bit_rate = get_bits(&gb, 11) * 1024;
103  w->mspel_bit = get_bits1(&gb);
104  s->loop_filter = get_bits1(&gb);
105  w->abt_flag = get_bits1(&gb);
106  w->j_type_bit = get_bits1(&gb);
107  w->top_left_mv_flag = get_bits1(&gb);
108  w->per_mb_rl_bit = get_bits1(&gb);
109  code = get_bits(&gb, 3);
110 
111  if (code == 0)
112  return AVERROR_INVALIDDATA;
113 
114  s->slice_height = s->mb_height / code;
115 
116  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
118  "fps:%d, br:%"PRId64", qpbit:%d, abt_flag:%d, j_type_bit:%d, "
119  "tl_mv_flag:%d, mbrl_bit:%d, code:%d, loop_filter:%d, "
120  "slices:%d\n",
121  fps, s->bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit,
122  w->top_left_mv_flag, w->per_mb_rl_bit, code, s->loop_filter,
123  code);
124  return 0;
125 }
126 
128 {
129  Wmv2Context *const w = (Wmv2Context *) s;
130  int code;
131 
132  if (s->picture_number == 0)
134 
135  s->pict_type = get_bits1(&s->gb) + 1;
136  if (s->pict_type == AV_PICTURE_TYPE_I) {
137  code = get_bits(&s->gb, 7);
138  av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code);
139  }
140  s->chroma_qscale = s->qscale = get_bits(&s->gb, 5);
141  if (s->qscale <= 0)
142  return AVERROR_INVALIDDATA;
143 
144  return 0;
145 }
146 
148 {
149  Wmv2Context *const w = (Wmv2Context *) s;
150 
151  if (s->pict_type == AV_PICTURE_TYPE_I) {
152  if (w->j_type_bit)
153  w->j_type = get_bits1(&s->gb);
154  else
155  w->j_type = 0; // FIXME check
156 
157  if (!w->j_type) {
158  if (w->per_mb_rl_bit)
159  s->per_mb_rl_table = get_bits1(&s->gb);
160  else
161  s->per_mb_rl_table = 0;
162 
163  if (!s->per_mb_rl_table) {
165  s->rl_table_index = decode012(&s->gb);
166  }
167 
168  s->dc_table_index = get_bits1(&s->gb);
169 
170  // at minimum one bit per macroblock is required at least in a valid frame,
171  // we discard frames much smaller than this. Frames smaller than 1/8 of the
172  // smallest "black/skip" frame generally contain not much recoverable content
173  // while at the same time they have the highest computational requirements
174  // per byte
175  if (get_bits_left(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16))
176  return AVERROR_INVALIDDATA;
177  }
178  s->inter_intra_pred = 0;
179  s->no_rounding = 1;
180  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
182  "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n",
185  }
186  } else {
187  int cbp_index;
188  int ret;
189  w->j_type = 0;
190 
191  ret = parse_mb_skip(w);
192  if (ret < 0)
193  return ret;
194  cbp_index = decode012(&s->gb);
195  w->cbp_table_index = wmv2_get_cbp_table_index(s, cbp_index);
196 
197  if (w->mspel_bit)
198  s->mspel = get_bits1(&s->gb);
199  else
200  s->mspel = 0; // FIXME check
201 
202  if (w->abt_flag) {
203  w->per_mb_abt = get_bits1(&s->gb) ^ 1;
204  if (!w->per_mb_abt)
205  w->abt_type = decode012(&s->gb);
206  }
207 
208  if (w->per_mb_rl_bit)
209  s->per_mb_rl_table = get_bits1(&s->gb);
210  else
211  s->per_mb_rl_table = 0;
212 
213  if (!s->per_mb_rl_table) {
214  s->rl_table_index = decode012(&s->gb);
216  }
217 
218  s->dc_table_index = get_bits1(&s->gb);
219  s->mv_table_index = get_bits1(&s->gb);
220 
221  s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE);
222  s->no_rounding ^= 1;
223 
224  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
226  "rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d mspel:%d "
227  "per_mb_abt:%d abt_type:%d cbp:%d ii:%d\n",
230  s->per_mb_rl_table, s->qscale, s->mspel,
232  s->inter_intra_pred);
233  }
234  }
235  s->esc3_level_length = 0;
236  s->esc3_run_length = 0;
237  s->picture_number++; // FIXME ?
238 
239  if (w->j_type) {
241  &s->gb, &s->mb_x, &s->mb_y,
242  2 * s->qscale, (s->qscale - 1) | 1,
243  s->loop_filter, s->low_delay);
244 
245  ff_er_add_slice(&w->s.er, 0, 0,
246  (w->s.mb_x >> 1) - 1, (w->s.mb_y >> 1) - 1,
247  ER_MB_END);
248  return 1;
249  }
250 
251  return 0;
252 }
253 
254 static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr)
255 {
256  MpegEncContext *const s = &w->s;
257  int ret;
258 
259  ret = ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);
260 
261  if (ret < 0)
262  return ret;
263 
264  if ((((*mx_ptr) | (*my_ptr)) & 1) && s->mspel)
265  w->hshift = get_bits1(&s->gb);
266  else
267  w->hshift = 0;
268 
269  return 0;
270 }
271 
272 static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py)
273 {
274  MpegEncContext *const s = &w->s;
275  int xy, wrap, diff, type;
276  int16_t *A, *B, *C, *mot_val;
277 
278  wrap = s->b8_stride;
279  xy = s->block_index[0];
280 
281  mot_val = s->current_picture.motion_val[0][xy];
282 
283  A = s->current_picture.motion_val[0][xy - 1];
284  B = s->current_picture.motion_val[0][xy - wrap];
285  C = s->current_picture.motion_val[0][xy + 2 - wrap];
286 
287  if (s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag)
288  diff = FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1]));
289  else
290  diff = 0;
291 
292  if (diff >= 8)
293  type = get_bits1(&s->gb);
294  else
295  type = 2;
296 
297  if (type == 0) {
298  *px = A[0];
299  *py = A[1];
300  } else if (type == 1) {
301  *px = B[0];
302  *py = B[1];
303  } else {
304  /* special case for first (slice) line */
305  if (s->first_slice_line) {
306  *px = A[0];
307  *py = A[1];
308  } else {
309  *px = mid_pred(A[0], B[0], C[0]);
310  *py = mid_pred(A[1], B[1], C[1]);
311  }
312  }
313 
314  return mot_val;
315 }
316 
317 static inline int wmv2_decode_inter_block(Wmv2Context *w, int16_t *block,
318  int n, int cbp)
319 {
320  MpegEncContext *const s = &w->s;
321  static const int sub_cbp_table[3] = { 2, 3, 1 };
322  int sub_cbp, ret;
323 
324  if (!cbp) {
325  s->block_last_index[n] = -1;
326  return 0;
327  }
328 
329  if (w->per_block_abt)
330  w->abt_type = decode012(&s->gb);
331  w->abt_type_table[n] = w->abt_type;
332 
333  if (w->abt_type) {
334 // const uint8_t *scantable = w->abt_scantable[w->abt_type - 1].permutated;
335  const uint8_t *scantable = w->abt_scantable[w->abt_type - 1].scantable;
336 // const uint8_t *scantable = w->abt_type - 1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable;
337 
338  sub_cbp = sub_cbp_table[decode012(&s->gb)];
339 
340  if (sub_cbp & 1)
341  if ((ret = ff_msmpeg4_decode_block(s, block, n, 1, scantable)) < 0)
342  return ret;
343 
344  if (sub_cbp & 2)
345  if ((ret = ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable)) < 0)
346  return ret;
347 
348  s->block_last_index[n] = 63;
349 
350  return 0;
351  } else {
352  return ff_msmpeg4_decode_block(s, block, n, 1,
354  }
355 }
356 
358 {
359  Wmv2Context *const w = (Wmv2Context *) s;
360  int cbp, code, i, ret;
361  uint8_t *coded_val;
362 
363  if (w->j_type)
364  return 0;
365 
366  if (s->pict_type == AV_PICTURE_TYPE_P) {
367  if (IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])) {
368  /* skip mb */
369  s->mb_intra = 0;
370  for (i = 0; i < 6; i++)
371  s->block_last_index[i] = -1;
372  s->mv_dir = MV_DIR_FORWARD;
373  s->mv_type = MV_TYPE_16X16;
374  s->mv[0][0][0] = 0;
375  s->mv[0][0][1] = 0;
376  s->mb_skipped = 1;
377  w->hshift = 0;
378  return 0;
379  }
380  if (get_bits_left(&s->gb) <= 0)
381  return AVERROR_INVALIDDATA;
382 
385  if (code < 0)
386  return AVERROR_INVALIDDATA;
387  s->mb_intra = (~code & 0x40) >> 6;
388 
389  cbp = code & 0x3f;
390  } else {
391  s->mb_intra = 1;
392  if (get_bits_left(&s->gb) <= 0)
393  return AVERROR_INVALIDDATA;
395  if (code < 0) {
397  "II-cbp illegal at %d %d\n", s->mb_x, s->mb_y);
398  return AVERROR_INVALIDDATA;
399  }
400  /* predict coded block pattern */
401  cbp = 0;
402  for (i = 0; i < 6; i++) {
403  int val = ((code >> (5 - i)) & 1);
404  if (i < 4) {
405  int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
406  val = val ^ pred;
407  *coded_val = val;
408  }
409  cbp |= val << (5 - i);
410  }
411  }
412 
413  if (!s->mb_intra) {
414  int mx, my;
415  wmv2_pred_motion(w, &mx, &my);
416 
417  if (cbp) {
418  s->bdsp.clear_blocks(s->block[0]);
419  if (s->per_mb_rl_table) {
420  s->rl_table_index = decode012(&s->gb);
422  }
423 
424  if (w->abt_flag && w->per_mb_abt) {
425  w->per_block_abt = get_bits1(&s->gb);
426  if (!w->per_block_abt)
427  w->abt_type = decode012(&s->gb);
428  } else
429  w->per_block_abt = 0;
430  }
431 
432  if ((ret = wmv2_decode_motion(w, &mx, &my)) < 0)
433  return ret;
434 
435  s->mv_dir = MV_DIR_FORWARD;
436  s->mv_type = MV_TYPE_16X16;
437  s->mv[0][0][0] = mx;
438  s->mv[0][0][1] = my;
439 
440  for (i = 0; i < 6; i++) {
441  if ((ret = wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1)) < 0) {
443  "\nerror while decoding inter block: %d x %d (%d)\n",
444  s->mb_x, s->mb_y, i);
445  return ret;
446  }
447  }
448  } else {
449  if (s->pict_type == AV_PICTURE_TYPE_P)
450  ff_dlog(s->avctx, "%d%d ", s->inter_intra_pred, cbp);
451  ff_dlog(s->avctx, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
452  ((cbp & 3) ? 1 : 0) + ((cbp & 0x3C) ? 2 : 0),
453  show_bits(&s->gb, 24));
454  s->ac_pred = get_bits1(&s->gb);
455  if (s->inter_intra_pred) {
458  ff_dlog(s->avctx, "%d%d %d %d/",
459  s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
460  }
461  if (s->per_mb_rl_table && cbp) {
462  s->rl_table_index = decode012(&s->gb);
464  }
465 
466  s->bdsp.clear_blocks(s->block[0]);
467  for (i = 0; i < 6; i++) {
468  if ((ret = ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL)) < 0) {
470  "\nerror while decoding intra block: %d x %d (%d)\n",
471  s->mb_x, s->mb_y, i);
472  return ret;
473  }
474  }
475  }
476 
477  return 0;
478 }
479 
481 {
482  Wmv2Context *const w = avctx->priv_data;
483  int ret;
484 
485 #if FF_API_EMU_EDGE
486  avctx->flags |= CODEC_FLAG_EMU_EDGE;
487 #endif
488 
489  if ((ret = ff_msmpeg4_decode_init(avctx)) < 0)
490  return ret;
491 
493 
494  return ff_intrax8_common_init(avctx, &w->x8, &w->s.idsp,
495  w->s.block, w->s.block_last_index,
496  w->s.mb_width, w->s.mb_height);
497 }
498 
500 {
501  Wmv2Context *w = avctx->priv_data;
502 
504  return ff_h263_decode_end(avctx);
505 }
506 
508  .name = "wmv2",
509  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
510  .type = AVMEDIA_TYPE_VIDEO,
511  .id = AV_CODEC_ID_WMV2,
512  .priv_data_size = sizeof(Wmv2Context),
514  .close = wmv2_decode_end,
517  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
518  AV_PIX_FMT_NONE },
519 };
static av_cold int wmv2_decode_init(AVCodecContext *avctx)
Definition: wmv2dec.c:480
int inter_intra_pred
Definition: mpegvideo.h:442
int j_type_bit
Definition: wmv2.h:39
IDCTDSPContext idsp
Definition: mpegvideo.h:227
#define NULL
Definition: coverity.c:32
#define MB_TYPE_SKIP
Definition: avcodec.h:1307
const char const char void * val
Definition: avisynth_c.h:771
int picture_number
Definition: mpegvideo.h:124
const char * s
Definition: avisynth_c.h:768
#define SKIP_TYPE_COL
Definition: wmv2.h:32
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static av_always_inline int wmv2_get_cbp_table_index(MpegEncContext *s, int cbp_index)
Definition: wmv2.h:74
int esc3_level_length
Definition: mpegvideo.h:438
static av_cold int wmv2_decode_end(AVCodecContext *avctx)
Definition: wmv2dec.c:499
int ff_wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: wmv2dec.c:357
#define C
int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:147
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:262
#define ER_MB_END
int ff_msmpeg4_decode_init(AVCodecContext *avctx)
Definition: msmpeg4dec.c:298
int16_t abt_block2[6][64]
Definition: wmv2.h:54
static int wmv2_decode_inter_block(Wmv2Context *w, int16_t *block, int n, int cbp)
Definition: wmv2dec.c:317
Definition: vf_geq.c:47
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int per_mb_abt
Definition: wmv2.h:44
static int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr)
Definition: wmv2dec.c:254
static int decode_ext_header(Wmv2Context *w)
Definition: wmv2dec.c:89
int abt_type_table[6]
Definition: wmv2.h:43
mpegvideo header.
int per_mb_rl_bit
Definition: wmv2.h:49
uint8_t permutated[64]
Definition: idctdsp.h:33
AVCodec.
Definition: avcodec.h:3739
#define MB_NON_INTRA_VLC_BITS
Definition: msmpeg4.h:34
int qscale
QP.
Definition: mpegvideo.h:201
av_cold int ff_intrax8_common_init(AVCodecContext *avctx, IntraX8Context *w, IDCTDSPContext *idsp, int16_t(*block)[64], int block_last_index[12], int mb_width, int mb_height)
Initialize IntraX8 frame decoder.
Definition: intrax8.c:728
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
static int16_t block[64]
Definition: dct.c:115
int esc3_run_length
Definition: mpegvideo.h:439
uint8_t
#define av_cold
Definition: attributes.h:82
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:3004
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1876
int no_rounding
apply no rounding to motion compensation (MPEG-4, msmpeg4, ...) for B-frames rounding mode is always ...
Definition: mpegvideo.h:284
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:177
int ff_msmpeg4_decode_motion(MpegEncContext *s, int *mx_ptr, int *my_ptr)
Definition: msmpeg4dec.c:840
MSMPEG4 data tables.
int ff_intrax8_decode_picture(IntraX8Context *w, Picture *pict, GetBitContext *gb, int *mb_x, int *mb_y, int dquant, int quant_offset, int loopfilter, int lowdelay)
Decode single IntraX8 frame.
Definition: intrax8.c:773
#define ff_dlog(a,...)
const uint8_t * scantable
Definition: idctdsp.h:32
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:126
MpegEncContext s
Definition: wmv2.h:36
#define A(x)
Definition: vp56_arith.h:28
#define av_log(a,...)
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:589
int ff_wmv2_decode_picture_header(MpegEncContext *s)
Definition: wmv2dec.c:127
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
int rl_chroma_table_index
Definition: mpegvideo.h:430
int mb_skipped
MUST BE SET only during DECODING.
Definition: mpegvideo.h:192
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:37
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:181
ERContext er
Definition: mpegvideo.h:551
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int per_mb_rl_table
Definition: mpegvideo.h:437
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1856
#define wrap(func)
Definition: neontest.h:65
const char * name
Name of the codec implementation.
Definition: avcodec.h:3746
#define IS_SKIP(a)
Definition: mpegutils.h:83
int low_delay
no reordering needed / has no B-frames
Definition: mpegvideo.h:404
AVCodec ff_wmv2_decoder
Definition: wmv2dec.c:507
GetBitContext gb
Definition: mpegvideo.h:446
#define FFMAX(a, b)
Definition: common.h:94
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:409
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
Definition: avcodec.h:996
av_cold void ff_intrax8_common_end(IntraX8Context *w)
Destroy IntraX8 frame structure.
Definition: intrax8.c:768
static int parse_mb_skip(Wmv2Context *w)
Definition: wmv2dec.c:33
int16_t(*[2] motion_val)[2]
Definition: mpegpicture.h:53
Picture * current_picture_ptr
pointer to the current picture
Definition: mpegvideo.h:181
ScanTable abt_scantable[2]
Definition: wmv2.h:53
int abt_type
Definition: wmv2.h:42
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:297
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
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:556
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:83
int n
Definition: avisynth_c.h:684
static int16_t * wmv2_pred_motion(Wmv2Context *w, int *px, int *py)
Definition: wmv2dec.c:272
if(ret< 0)
Definition: vf_mcdeint.c:279
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:293
static const float pred[4]
Definition: siprdata.h:259
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
int first_slice_line
used in MPEG-4 too to handle resync markers
Definition: mpegvideo.h:434
int abt_flag
Definition: wmv2.h:41
Libavcodec external API header.
#define SKIP_TYPE_MPEG
Definition: wmv2.h:30
BlockDSPContext bdsp
Definition: mpegvideo.h:223
int cbp_table_index
Definition: wmv2.h:47
int debug
debug
Definition: avcodec.h:3003
main external API structure.
Definition: avcodec.h:1761
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:97
VLC ff_inter_intra_vlc
Definition: msmpeg4dec.c:70
int skip_type
Definition: wmv2.h:50
int extradata_size
Definition: avcodec.h:1877
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:314
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:426
#define MB_INTRA_VLC_BITS
Definition: msmpeg4.h:35
int slice_height
in macroblocks
Definition: mpegvideo.h:433
#define MB_TYPE_16x16
Definition: avcodec.h:1299
#define mid_pred
Definition: mathops.h:97
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:209
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:266
int mv[2][4][2]
motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...
Definition: mpegvideo.h:276
int b8_stride
2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
Definition: mpegvideo.h:128
MpegEncContext.
Definition: mpegvideo.h:78
struct AVCodecContext * avctx
Definition: mpegvideo.h:95
#define SKIP_TYPE_NONE
Definition: wmv2.h:29
#define CODEC_FLAG_EMU_EDGE
Definition: avcodec.h:1140
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
common internal api header.
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:127
VLC ff_mb_non_intra_vlc[4]
Definition: msmpeg4dec.c:64
int per_block_abt
Definition: wmv2.h:45
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:149
void * priv_data
Definition: avcodec.h:1803
int hshift
Definition: wmv2.h:51
static av_always_inline int diff(const uint32_t a, const uint32_t b)
IntraX8Context x8
Definition: wmv2.h:37
av_cold void ff_wmv2_common_init(Wmv2Context *w)
Definition: wmv2.c:31
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:498
static int decode012(GetBitContext *gb)
Definition: get_bits.h:571
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
int64_t bit_rate
wanted bit rate
Definition: mpegvideo.h:100
int rl_table_index
Definition: mpegvideo.h:429
int chroma_qscale
chroma QP
Definition: mpegvideo.h:202
int ff_msmpeg4_decode_block(MpegEncContext *s, int16_t *block, int n, int coded, const uint8_t *scan_table)
Definition: msmpeg4dec.c:653
int mspel_bit
Definition: wmv2.h:46
#define INTER_INTRA_VLC_BITS
Definition: msmpeg4.h:33
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
VLC ff_msmp4_mb_i_vlc
Definition: msmpeg4data.c:38
ScanTable inter_scantable
if inter == intra then intra should be used to reduce the cache usage
Definition: mpegvideo.h:87
int ff_msmpeg4_coded_block_pred(MpegEncContext *s, int n, uint8_t **coded_block_ptr)
Definition: msmpeg4.c:153
#define SKIP_TYPE_ROW
Definition: wmv2.h:31
int mv_table_index
Definition: mpegvideo.h:428
int h263_aic_dir
AIC direction: 0 = left, 1 = top.
Definition: mpegvideo.h:376
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:1002
int dc_table_index
Definition: mpegvideo.h:431
#define MB_TYPE_L0
Definition: avcodec.h:1312
Predicted.
Definition: avutil.h:275
int top_left_mv_flag
Definition: wmv2.h:48
int j_type
Definition: wmv2.h:40