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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 /**
179  * Imode types
180  * @{
181  */
182 enum Imode {
190 };
191 /** @} */ //imode defines
192 
193 /** The VC1 Context
194  * @todo Change size wherever another size is more efficient
195  * Many members are only used for Advanced Profile
196  */
197 typedef struct VC1Context{
202 
203  int bits;
204 
205  /** Simple/Main Profile sequence header */
206  //@{
207  int res_sprite; ///< reserved, sprite mode
208  int res_y411; ///< reserved, old interlaced mode
209  int res_x8; ///< reserved
210  int multires; ///< frame-level RESPIC syntax element present
211  int res_fasttx; ///< reserved, always 1
212  int res_transtab; ///< reserved, always 0
213  int rangered; ///< RANGEREDFRM (range reduction) syntax element present
214  ///< at frame level
215  int res_rtm_flag; ///< reserved, set to 1
216  int reserved; ///< reserved
217  //@}
218 
219  /** Advanced Profile */
220  //@{
221  int level; ///< 3bits, for Advanced/Simple Profile, provided by TS layer
222  int chromaformat; ///< 2bits, 2=4:2:0, only defined
223  int postprocflag; ///< Per-frame processing suggestion flag present
224  int broadcast; ///< TFF/RFF present
225  int interlace; ///< Progressive/interlaced (RPTFTM syntax element)
226  int tfcntrflag; ///< TFCNTR present
227  int panscanflag; ///< NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} present
228  int refdist_flag; ///< REFDIST syntax element present in II, IP, PI or PP field picture headers
229  int extended_dmv; ///< Additional extended dmv range at P/B frame-level
230  int hrd_param_flag; ///< Presence of Hypothetical Reference
231  ///< Decoder parameters
232  int psf; ///< Progressive Segmented Frame
233  //@}
234 
235  /** Sequence header data for all Profiles
236  * TODO: choose between ints, uint8_ts and monobit flags
237  */
238  //@{
239  int profile; ///< 2bits, Profile
240  int frmrtq_postproc; ///< 3bits,
241  int bitrtq_postproc; ///< 5bits, quantized framerate-based postprocessing strength
243  int fastuvmc; ///< Rounding of qpel vector to hpel ? (not in Simple)
244  int extended_mv; ///< Ext MV in P/B (not in Simple)
245  int dquant; ///< How qscale varies with MBs, 2bits (not in Simple)
246  int vstransform; ///< variable-size [48]x[48] transform type + info
247  int overlap; ///< overlapped transforms in use
248  int quantizer_mode; ///< 2bits, quantizer mode used for sequence, see QUANT_*
249  int finterpflag; ///< INTERPFRM present
250  //@}
251 
252  /** Frame decoding info for all profiles */
253  //@{
254  uint8_t mv_mode; ///< MV coding monde
255  uint8_t mv_mode2; ///< Secondary MV coding mode (B frames)
256  int k_x; ///< Number of bits for MVs (depends on MV range)
257  int k_y; ///< Number of bits for MVs (depends on MV range)
258  int range_x, range_y; ///< MV range
259  uint8_t pq, altpq; ///< Current/alternate frame quantizer scale
260  uint8_t zz_8x8[4][64]; ///< Zigzag table for TT_8x8, permuted for IDCT
261  int left_blk_sh, top_blk_sh; ///< Either 3 or 0, positions of l/t in blk[]
262  const uint8_t* zz_8x4; ///< Zigzag scan table for TT_8x4 coding mode
263  const uint8_t* zz_4x8; ///< Zigzag scan table for TT_4x8 coding mode
264  /** pquant parameters */
265  //@{
270  //@}
271  /** AC coding set indexes
272  * @see 8.1.1.10, p(1)10
273  */
274  //@{
275  int c_ac_table_index; ///< Chroma index from ACFRM element
276  int y_ac_table_index; ///< Luma index from AC2FRM element
277  //@}
278  int ttfrm; ///< Transform type info present at frame level
279  uint8_t ttmbf; ///< Transform type flag
280  int *ttblk_base, *ttblk; ///< Transform type at the block level
281  int codingset; ///< index of current table set from 11.8 to use for luma block decoding
282  int codingset2; ///< index of current table set from 11.8 to use for chroma block decoding
283  int pqindex; ///< raw pqindex used in coding set selection
286 
287 
288  /** Luma compensation parameters */
289  //@{
292  //@}
293  int16_t bfraction; ///< Relative position % anchors=> how to scale MVs
294  uint8_t halfpq; ///< Uniform quant over image and qp+.5
295  uint8_t respic; ///< Frame-level flag for resized images
296  int buffer_fullness; ///< HRD info
297  /** Ranges:
298  * -# 0 -> [-64n 63.f] x [-32, 31.f]
299  * -# 1 -> [-128, 127.f] x [-64, 63.f]
300  * -# 2 -> [-512, 511.f] x [-128, 127.f]
301  * -# 3 -> [-1024, 1023.f] x [-256, 255.f]
302  */
303  uint8_t mvrange; ///< Extended MV range flag
304  uint8_t pquantizer; ///< Uniform (over sequence) quantizer in use
305  VLC *cbpcy_vlc; ///< CBPCY VLC table
306  int tt_index; ///< Index for Transform Type tables (to decode TTMB)
307  uint8_t* mv_type_mb_plane; ///< bitplane for mv_type == (4MV)
308  uint8_t* direct_mb_plane; ///< bitplane for "direct" MBs
309  uint8_t* forward_mb_plane; ///< bitplane for "forward" MBs
310  int mv_type_is_raw; ///< mv type mb plane is not coded
311  int dmb_is_raw; ///< direct mb plane is raw
312  int fmb_is_raw; ///< forward mb plane is raw
313  int skip_is_raw; ///< skip mb plane is not coded
314  uint8_t last_luty[2][256], last_lutuv[2][256]; ///< lookup tables used for intensity compensation
315  uint8_t aux_luty[2][256], aux_lutuv[2][256]; ///< lookup tables used for intensity compensation
316  uint8_t next_luty[2][256], next_lutuv[2][256]; ///< lookup tables used for intensity compensation
317  uint8_t (*curr_luty)[256] ,(*curr_lutuv)[256];
319  int rnd; ///< rounding control
320 
321  /** Frame decoding info for S/M profiles only */
322  //@{
323  uint8_t rangeredfrm; ///< out_sample = CLIP((in_sample-128)*2+128)
325  //@}
326 
327  /** Frame decoding info for Advanced profile */
328  //@{
333  uint16_t topleftx;
334  uint16_t toplefty;
335  uint16_t bottomrightx;
336  uint16_t bottomrighty;
342  uint8_t* acpred_plane; ///< AC prediction flags bitplane
344  uint8_t* over_flags_plane; ///< Overflags bitplane
347  uint16_t *hrd_rate, *hrd_buffer;
353  //@}
354 
355  /** Frame decoding info for interlaced picture */
356  uint8_t dmvrange; ///< Extended differential MV range flag
358  int intcomp;
359  uint8_t lumscale2; ///< for interlaced field P picture
370  uint8_t *blk_mv_type_base, *blk_mv_type; ///< 0: frame MV, 1: field MV (interlaced frame)
371  uint8_t *mv_f_base, *mv_f[2]; ///< 0: MV obtained from same field, 1: opposite field
373  int field_mode; ///< 1 for interlaced field pictures
374  int fptype;
376  int refdist; ///< distance of the current picture from reference
377  int numref; ///< number of past field pictures used as reference
378  // 0 corresponds to 1 and 1 corresponds to 2 references
379  int reffield; ///< if numref = 0 (1 reference) then reffield decides which
380  // field to use among the two fields from previous frame
381  int intcompfield; ///< which of the two fields to be intensity compensated
382  // 0: both fields, 1: bottom field, 2: top field
383  int cur_field_type; ///< 0: top, 1: bottom
384  int ref_field_type[2]; ///< forward and backward reference field type (top or bottom)
386  int qs_last; ///< if qpel has been used in the previous (tr.) picture
387  int bmvtype;
388  int frfd, brfd; ///< reference frame distance (forward or backward)
391 
392  /** Frame decoding info for sprite modes */
393  //@{
398  uint8_t* sr_rows[2][2]; ///< Sprite resizer line cache
399  //@}
400 
402  int bi_type;
403  int x8_type;
404 
405  int16_t (*block)[6][64];
407  uint32_t *cbp_base, *cbp;
409  int16_t (*luma_mv_base)[2], (*luma_mv)[2];
410  uint8_t bfraction_lut_index; ///< Index for BFRACTION value (see Table 40, reproduced into ff_vc1_bfraction_lut[])
411  uint8_t broken_link; ///< Broken link flag (BROKEN_LINK syntax element)
412  uint8_t closed_entry; ///< Closed entry point flag (CLOSED_ENTRY syntax element)
413 
414  int end_mb_x; ///< Horizontal macroblock limit (used only by mss2)
415 
416  int parse_only; ///< Context is used within parser
417  int resync_marker; ///< could this stream contain resync markers
418 } VC1Context;
419 
420 /** Find VC-1 marker in buffer
421  * @return position where next marker starts or end of buffer if no marker found
422  */
424 {
425  uint32_t mrk = 0xFFFFFFFF;
426 
427  if (end-src < 4)
428  return end;
429  while (src < end) {
430  mrk = (mrk << 8) | *src++;
431  if (IS_MARKER(mrk))
432  return src - 4;
433  }
434  return end;
435 }
436 
438 {
439  int dsize = 0, i;
440 
441  if (size < 4) {
442  for (dsize = 0; dsize < size; dsize++)
443  *dst++ = *src++;
444  return size;
445  }
446  for (i = 0; i < size; i++, src++) {
447  if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
448  dst[dsize++] = src[1];
449  src++;
450  i++;
451  } else
452  dst[dsize++] = *src;
453  }
454  return dsize;
455 }
456 
457 /**
458  * Decode Simple/Main Profiles sequence header
459  * @see Figure 7-8, p16-17
460  * @param avctx Codec context
461  * @param gb GetBit context initialized from Codec context extra_data
462  * @return Status
463  */
465 
467 
471 
476 
477 #endif /* AVCODEC_VC1_H */