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vc1.h
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1 /*
2  * VC-1 and WMV3 decoder
3  * Copyright (c) 2006-2007 Konstantin Shishkov
4  * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #ifndef AVCODEC_VC1_H
24 #define AVCODEC_VC1_H
25 
26 #include "avcodec.h"
27 #include "h264chroma.h"
28 #include "mpegvideo.h"
29 #include "intrax8.h"
30 #include "vc1dsp.h"
31 
32 #define AC_VLC_BITS 9
33 
34 /** Markers used in VC-1 AP frame data */
35 //@{
36 enum VC1Code {
37  VC1_CODE_RES0 = 0x00000100,
38  VC1_CODE_ENDOFSEQ = 0x0000010A,
44 };
45 //@}
46 
47 #define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)
48 
49 /** Available Profiles */
50 //@{
51 enum Profile {
54  PROFILE_COMPLEX, ///< TODO: WMV9 specific
56 };
57 //@}
58 
59 /** Sequence quantizer mode */
60 //@{
61 enum QuantMode {
62  QUANT_FRAME_IMPLICIT, ///< Implicitly specified at frame level
63  QUANT_FRAME_EXPLICIT, ///< Explicitly specified at frame level
64  QUANT_NON_UNIFORM, ///< Non-uniform quant used for all frames
65  QUANT_UNIFORM ///< Uniform quant used for all frames
66 };
67 //@}
68 
69 /** Where quant can be changed */
70 //@{
71 enum DQProfile {
76 };
77 //@}
78 
79 /** @name Where quant can be changed
80  */
81 //@{
87 };
88 //@}
89 
90 /** Which pair of edges is quantized with ALTPQUANT */
91 //@{
97 };
98 //@}
99 
100 /** MV modes for P frames */
101 //@{
102 enum MVModes {
108 };
109 //@}
110 
111 /** MBMODE for interlaced frame P-picture */
112 //@{
120 };
121 //@}
122 
123 /** @name MV types for B frames */
124 //@{
125 enum BMVTypes {
130 };
131 //@}
132 
133 /** @name Block types for P/B frames */
134 //@{
139  TT_8X4, // both halves
142  TT_4X8, // both halves
144 };
145 //@}
146 
147 enum CodingSet {
156 };
157 
158 /** @name Overlap conditions for Advanced Profile */
159 //@{
160 enum COTypes {
164 };
165 //@}
166 
167 /**
168  * FCM Frame Coding Mode
169  * @note some content might be marked interlaced
170  * but have fcm set to 0 as well (e.g. HD-DVD)
171  */
173  PROGRESSIVE = 0, ///< in the bitstream is reported as 00b
174  ILACE_FRAME, ///< in the bitstream is reported as 10b
175  ILACE_FIELD ///< in the bitstream is reported as 11b
176 };
177 
178 /** The VC1 Context
179  * @todo Change size wherever another size is more efficient
180  * Many members are only used for Advanced Profile
181  */
182 typedef struct VC1Context{
187 
188  int bits;
189 
190  /** Simple/Main Profile sequence header */
191  //@{
192  int res_sprite; ///< reserved, sprite mode
193  int res_y411; ///< reserved, old interlaced mode
194  int res_x8; ///< reserved
195  int multires; ///< frame-level RESPIC syntax element present
196  int res_fasttx; ///< reserved, always 1
197  int res_transtab; ///< reserved, always 0
198  int rangered; ///< RANGEREDFRM (range reduction) syntax element present
199  ///< at frame level
200  int res_rtm_flag; ///< reserved, set to 1
201  int reserved; ///< reserved
202  //@}
203 
204  /** Advanced Profile */
205  //@{
206  int level; ///< 3bits, for Advanced/Simple Profile, provided by TS layer
207  int chromaformat; ///< 2bits, 2=4:2:0, only defined
208  int postprocflag; ///< Per-frame processing suggestion flag present
209  int broadcast; ///< TFF/RFF present
210  int interlace; ///< Progressive/interlaced (RPTFTM syntax element)
211  int tfcntrflag; ///< TFCNTR present
212  int panscanflag; ///< NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} present
213  int refdist_flag; ///< REFDIST syntax element present in II, IP, PI or PP field picture headers
214  int extended_dmv; ///< Additional extended dmv range at P/B frame-level
215  int hrd_param_flag; ///< Presence of Hypothetical Reference
216  ///< Decoder parameters
217  int psf; ///< Progressive Segmented Frame
218  //@}
219 
220  /** Sequence header data for all Profiles
221  * TODO: choose between ints, uint8_ts and monobit flags
222  */
223  //@{
224  int profile; ///< 2bits, Profile
225  int frmrtq_postproc; ///< 3bits,
226  int bitrtq_postproc; ///< 5bits, quantized framerate-based postprocessing strength
228  int fastuvmc; ///< Rounding of qpel vector to hpel ? (not in Simple)
229  int extended_mv; ///< Ext MV in P/B (not in Simple)
230  int dquant; ///< How qscale varies with MBs, 2bits (not in Simple)
231  int vstransform; ///< variable-size [48]x[48] transform type + info
232  int overlap; ///< overlapped transforms in use
233  int quantizer_mode; ///< 2bits, quantizer mode used for sequence, see QUANT_*
234  int finterpflag; ///< INTERPFRM present
235  //@}
236 
237  /** Frame decoding info for all profiles */
238  //@{
239  uint8_t mv_mode; ///< MV coding monde
240  uint8_t mv_mode2; ///< Secondary MV coding mode (B frames)
241  int k_x; ///< Number of bits for MVs (depends on MV range)
242  int k_y; ///< Number of bits for MVs (depends on MV range)
243  int range_x, range_y; ///< MV range
244  uint8_t pq, altpq; ///< Current/alternate frame quantizer scale
245  uint8_t zz_8x8[4][64]; ///< Zigzag table for TT_8x8, permuted for IDCT
246  int left_blk_sh, top_blk_sh; ///< Either 3 or 0, positions of l/t in blk[]
247  const uint8_t* zz_8x4; ///< Zigzag scan table for TT_8x4 coding mode
248  const uint8_t* zz_4x8; ///< Zigzag scan table for TT_4x8 coding mode
249  /** pquant parameters */
250  //@{
255  //@}
256  /** AC coding set indexes
257  * @see 8.1.1.10, p(1)10
258  */
259  //@{
260  int c_ac_table_index; ///< Chroma index from ACFRM element
261  int y_ac_table_index; ///< Luma index from AC2FRM element
262  //@}
263  int ttfrm; ///< Transform type info present at frame level
264  uint8_t ttmbf; ///< Transform type flag
265  int *ttblk_base, *ttblk; ///< Transform type at the block level
266  int codingset; ///< index of current table set from 11.8 to use for luma block decoding
267  int codingset2; ///< index of current table set from 11.8 to use for chroma block decoding
268  int pqindex; ///< raw pqindex used in coding set selection
271 
272 
273  /** Luma compensation parameters */
274  //@{
277  //@}
278  int16_t bfraction; ///< Relative position % anchors=> how to scale MVs
279  uint8_t halfpq; ///< Uniform quant over image and qp+.5
280  uint8_t respic; ///< Frame-level flag for resized images
281  int buffer_fullness; ///< HRD info
282  /** Ranges:
283  * -# 0 -> [-64n 63.f] x [-32, 31.f]
284  * -# 1 -> [-128, 127.f] x [-64, 63.f]
285  * -# 2 -> [-512, 511.f] x [-128, 127.f]
286  * -# 3 -> [-1024, 1023.f] x [-256, 255.f]
287  */
288  uint8_t mvrange; ///< Extended MV range flag
289  uint8_t pquantizer; ///< Uniform (over sequence) quantizer in use
290  VLC *cbpcy_vlc; ///< CBPCY VLC table
291  int tt_index; ///< Index for Transform Type tables (to decode TTMB)
292  uint8_t* mv_type_mb_plane; ///< bitplane for mv_type == (4MV)
293  uint8_t* direct_mb_plane; ///< bitplane for "direct" MBs
294  uint8_t* forward_mb_plane; ///< bitplane for "forward" MBs
295  int mv_type_is_raw; ///< mv type mb plane is not coded
296  int dmb_is_raw; ///< direct mb plane is raw
297  int fmb_is_raw; ///< forward mb plane is raw
298  int skip_is_raw; ///< skip mb plane is not coded
299  uint8_t luty[256], lutuv[256]; ///< lookup tables used for intensity compensation
300  int use_ic; ///< use intensity compensation in B-frames
301  int rnd; ///< rounding control
302 
303  /** Frame decoding info for S/M profiles only */
304  //@{
305  uint8_t rangeredfrm; ///< out_sample = CLIP((in_sample-128)*2+128)
307  //@}
308 
309  /** Frame decoding info for Advanced profile */
310  //@{
315  uint16_t topleftx;
316  uint16_t toplefty;
317  uint16_t bottomrightx;
318  uint16_t bottomrighty;
324  uint8_t* acpred_plane; ///< AC prediction flags bitplane
326  uint8_t* over_flags_plane; ///< Overflags bitplane
329  uint16_t *hrd_rate, *hrd_buffer;
335  //@}
336 
337  /** Frame decoding info for interlaced picture */
338  uint8_t dmvrange; ///< Extended differential MV range flag
340  int intcomp;
341  uint8_t lumscale2; ///< for interlaced field P picture
343  uint8_t luty2[256], lutuv2[256]; // lookup tables used for intensity compensation
353  uint8_t *blk_mv_type_base, *blk_mv_type; ///< 0: frame MV, 1: field MV (interlaced frame)
354  uint8_t *mv_f_base, *mv_f[2]; ///< 0: MV obtained from same field, 1: opposite field
357  int field_mode; ///< 1 for interlaced field pictures
358  int fptype;
360  int refdist; ///< distance of the current picture from reference
361  int numref; ///< number of past field pictures used as reference
362  // 0 corresponds to 1 and 1 corresponds to 2 references
363  int reffield; ///< if numref = 0 (1 reference) then reffield decides which
364  // field to use among the two fields from previous frame
365  int intcompfield; ///< which of the two fields to be intensity compensated
366  // 0: both fields, 1: bottom field, 2: top field
367  int cur_field_type; ///< 0: top, 1: bottom
368  int ref_field_type[2]; ///< forward and backward reference field type (top or bottom)
370  int qs_last; ///< if qpel has been used in the previous (tr.) picture
371  int bmvtype;
372  int frfd, brfd; ///< reference frame distance (forward or backward)
375 
376  /** Frame decoding info for sprite modes */
377  //@{
382  uint8_t* sr_rows[2][2]; ///< Sprite resizer line cache
383  //@}
384 
386  int bi_type;
387  int x8_type;
388 
389  int16_t (*block)[6][64];
391  uint32_t *cbp_base, *cbp;
393  int16_t (*luma_mv_base)[2], (*luma_mv)[2];
394  uint8_t bfraction_lut_index; ///< Index for BFRACTION value (see Table 40, reproduced into ff_vc1_bfraction_lut[])
395  uint8_t broken_link; ///< Broken link flag (BROKEN_LINK syntax element)
396  uint8_t closed_entry; ///< Closed entry point flag (CLOSED_ENTRY syntax element)
397 
398  int end_mb_x; ///< Horizontal macroblock limit (used only by mss2)
399 
400  int parse_only; ///< Context is used within parser
401 
403 } VC1Context;
404 
405 /** Find VC-1 marker in buffer
406  * @return position where next marker starts or end of buffer if no marker found
407  */
408 static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
409 {
410  uint32_t mrk = 0xFFFFFFFF;
411 
412  if (end-src < 4)
413  return end;
414  while (src < end) {
415  mrk = (mrk << 8) | *src++;
416  if (IS_MARKER(mrk))
417  return src - 4;
418  }
419  return end;
420 }
421 
423 {
424  int dsize = 0, i;
425 
426  if (size < 4) {
427  for (dsize = 0; dsize < size; dsize++)
428  *dst++ = *src++;
429  return size;
430  }
431  for (i = 0; i < size; i++, src++) {
432  if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
433  dst[dsize++] = src[1];
434  src++;
435  i++;
436  } else
437  dst[dsize++] = *src;
438  }
439  return dsize;
440 }
441 
442 /**
443  * Decode Simple/Main Profiles sequence header
444  * @see Figure 7-8, p16-17
445  * @param avctx Codec context
446  * @param gb GetBit context initialized from Codec context extra_data
447  * @return Status
448  */
450 
452 
456 
461 
462 #endif /* AVCODEC_VC1_H */