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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 "vc1_common.h"
31 #include "vc1dsp.h"
32 
33 #define AC_VLC_BITS 9
34 
35 /** Sequence quantizer mode */
36 //@{
37 enum QuantMode {
38  QUANT_FRAME_IMPLICIT, ///< Implicitly specified at frame level
39  QUANT_FRAME_EXPLICIT, ///< Explicitly specified at frame level
40  QUANT_NON_UNIFORM, ///< Non-uniform quant used for all frames
41  QUANT_UNIFORM ///< Uniform quant used for all frames
42 };
43 //@}
44 
45 /** Where quant can be changed */
46 //@{
47 enum DQProfile {
52 };
53 //@}
54 
55 /** @name Where quant can be changed
56  */
57 //@{
63 };
64 //@}
65 
66 /** Which pair of edges is quantized with ALTPQUANT */
67 //@{
73 };
74 //@}
75 
76 /** MV modes for P frames */
77 //@{
78 enum MVModes {
84 };
85 //@}
86 
87 /** MBMODE for interlaced frame P-picture */
88 //@{
96 };
97 //@}
98 
99 /** @name MV types for B frames */
100 //@{
101 enum BMVTypes {
106 };
107 //@}
108 
109 /** @name Block types for P/B frames */
110 //@{
115  TT_8X4, // both halves
118  TT_4X8, // both halves
120 };
121 //@}
122 
123 enum CodingSet {
132 };
133 
134 /** @name Overlap conditions for Advanced Profile */
135 //@{
136 enum COTypes {
140 };
141 //@}
142 
143 /**
144  * FCM Frame Coding Mode
145  * @note some content might be marked interlaced
146  * but have fcm set to 0 as well (e.g. HD-DVD)
147  */
149  PROGRESSIVE = 0, ///< in the bitstream is reported as 00b
150  ILACE_FRAME, ///< in the bitstream is reported as 10b
151  ILACE_FIELD ///< in the bitstream is reported as 11b
152 };
153 
154 /**
155  * Imode types
156  * @{
157  */
158 enum Imode {
166 };
167 /** @} */ //imode defines
168 
169 /** The VC1 Context
170  * @todo Change size wherever another size is more efficient
171  * Many members are only used for Advanced Profile
172  */
173 typedef struct VC1Context{
178 
179  int bits;
180 
181  /** Simple/Main Profile sequence header */
182  //@{
183  int res_sprite; ///< reserved, sprite mode
184  int res_y411; ///< reserved, old interlaced mode
185  int res_x8; ///< reserved
186  int multires; ///< frame-level RESPIC syntax element present
187  int res_fasttx; ///< reserved, always 1
188  int res_transtab; ///< reserved, always 0
189  int rangered; ///< RANGEREDFRM (range reduction) syntax element present
190  ///< at frame level
191  int res_rtm_flag; ///< reserved, set to 1
192  int reserved; ///< reserved
193  //@}
194 
195  /** Advanced Profile */
196  //@{
197  int level; ///< 3bits, for Advanced/Simple Profile, provided by TS layer
198  int chromaformat; ///< 2bits, 2=4:2:0, only defined
199  int postprocflag; ///< Per-frame processing suggestion flag present
200  int broadcast; ///< TFF/RFF present
201  int interlace; ///< Progressive/interlaced (RPTFTM syntax element)
202  int tfcntrflag; ///< TFCNTR present
203  int panscanflag; ///< NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} present
204  int refdist_flag; ///< REFDIST syntax element present in II, IP, PI or PP field picture headers
205  int extended_dmv; ///< Additional extended dmv range at P/B frame-level
206  int hrd_param_flag; ///< Presence of Hypothetical Reference
207  ///< Decoder parameters
208  int psf; ///< Progressive Segmented Frame
209  //@}
210 
211  /** Sequence header data for all Profiles
212  * TODO: choose between ints, uint8_ts and monobit flags
213  */
214  //@{
215  int profile; ///< 2bits, Profile
216  int frmrtq_postproc; ///< 3bits,
217  int bitrtq_postproc; ///< 5bits, quantized framerate-based postprocessing strength
219  int fastuvmc; ///< Rounding of qpel vector to hpel ? (not in Simple)
220  int extended_mv; ///< Ext MV in P/B (not in Simple)
221  int dquant; ///< How qscale varies with MBs, 2bits (not in Simple)
222  int vstransform; ///< variable-size [48]x[48] transform type + info
223  int overlap; ///< overlapped transforms in use
224  int quantizer_mode; ///< 2bits, quantizer mode used for sequence, see QUANT_*
225  int finterpflag; ///< INTERPFRM present
226  //@}
227 
228  /** Frame decoding info for all profiles */
229  //@{
230  uint8_t mv_mode; ///< MV coding monde
231  uint8_t mv_mode2; ///< Secondary MV coding mode (B frames)
232  int k_x; ///< Number of bits for MVs (depends on MV range)
233  int k_y; ///< Number of bits for MVs (depends on MV range)
234  int range_x, range_y; ///< MV range
235  uint8_t pq, altpq; ///< Current/alternate frame quantizer scale
236  uint8_t zz_8x8[4][64]; ///< Zigzag table for TT_8x8, permuted for IDCT
237  int left_blk_sh, top_blk_sh; ///< Either 3 or 0, positions of l/t in blk[]
238  const uint8_t* zz_8x4; ///< Zigzag scan table for TT_8x4 coding mode
239  const uint8_t* zz_4x8; ///< Zigzag scan table for TT_4x8 coding mode
240  /** pquant parameters */
241  //@{
246  //@}
247  /** AC coding set indexes
248  * @see 8.1.1.10, p(1)10
249  */
250  //@{
251  int c_ac_table_index; ///< Chroma index from ACFRM element
252  int y_ac_table_index; ///< Luma index from AC2FRM element
253  //@}
254  int ttfrm; ///< Transform type info present at frame level
255  uint8_t ttmbf; ///< Transform type flag
256  int *ttblk_base, *ttblk; ///< Transform type at the block level
257  int codingset; ///< index of current table set from 11.8 to use for luma block decoding
258  int codingset2; ///< index of current table set from 11.8 to use for chroma block decoding
259  int pqindex; ///< raw pqindex used in coding set selection
262 
263 
264  /** Luma compensation parameters */
265  //@{
268  //@}
269  int16_t bfraction; ///< Relative position % anchors=> how to scale MVs
270  uint8_t halfpq; ///< Uniform quant over image and qp+.5
271  uint8_t respic; ///< Frame-level flag for resized images
272  int buffer_fullness; ///< HRD info
273  /** Ranges:
274  * -# 0 -> [-64n 63.f] x [-32, 31.f]
275  * -# 1 -> [-128, 127.f] x [-64, 63.f]
276  * -# 2 -> [-512, 511.f] x [-128, 127.f]
277  * -# 3 -> [-1024, 1023.f] x [-256, 255.f]
278  */
279  uint8_t mvrange; ///< Extended MV range flag
280  uint8_t pquantizer; ///< Uniform (over sequence) quantizer in use
281  VLC *cbpcy_vlc; ///< CBPCY VLC table
282  int tt_index; ///< Index for Transform Type tables (to decode TTMB)
283  uint8_t* mv_type_mb_plane; ///< bitplane for mv_type == (4MV)
284  uint8_t* direct_mb_plane; ///< bitplane for "direct" MBs
285  uint8_t* forward_mb_plane; ///< bitplane for "forward" MBs
286  int mv_type_is_raw; ///< mv type mb plane is not coded
287  int dmb_is_raw; ///< direct mb plane is raw
288  int fmb_is_raw; ///< forward mb plane is raw
289  int skip_is_raw; ///< skip mb plane is not coded
290  uint8_t last_luty[2][256], last_lutuv[2][256]; ///< lookup tables used for intensity compensation
291  uint8_t aux_luty[2][256], aux_lutuv[2][256]; ///< lookup tables used for intensity compensation
292  uint8_t next_luty[2][256], next_lutuv[2][256]; ///< lookup tables used for intensity compensation
293  uint8_t (*curr_luty)[256] ,(*curr_lutuv)[256];
295  int rnd; ///< rounding control
296 
297  /** Frame decoding info for S/M profiles only */
298  //@{
299  uint8_t rangeredfrm; ///< out_sample = CLIP((in_sample-128)*2+128)
301  //@}
302 
303  /** Frame decoding info for Advanced profile */
304  //@{
309  uint16_t topleftx;
310  uint16_t toplefty;
311  uint16_t bottomrightx;
312  uint16_t bottomrighty;
318  uint8_t* acpred_plane; ///< AC prediction flags bitplane
320  uint8_t* over_flags_plane; ///< Overflags bitplane
323  uint16_t *hrd_rate, *hrd_buffer;
329  //@}
330 
331  /** Frame decoding info for interlaced picture */
332  uint8_t dmvrange; ///< Extended differential MV range flag
334  int intcomp;
335  uint8_t lumscale2; ///< for interlaced field P picture
346  uint8_t *blk_mv_type_base, *blk_mv_type; ///< 0: frame MV, 1: field MV (interlaced frame)
347  uint8_t *mv_f_base, *mv_f[2]; ///< 0: MV obtained from same field, 1: opposite field
349  int field_mode; ///< 1 for interlaced field pictures
350  int fptype;
352  int refdist; ///< distance of the current picture from reference
353  int numref; ///< number of past field pictures used as reference
354  // 0 corresponds to 1 and 1 corresponds to 2 references
355  int reffield; ///< if numref = 0 (1 reference) then reffield decides which
356  // field to use among the two fields from previous frame
357  int intcompfield; ///< which of the two fields to be intensity compensated
358  // 0: both fields, 1: bottom field, 2: top field
359  int cur_field_type; ///< 0: top, 1: bottom
360  int ref_field_type[2]; ///< forward and backward reference field type (top or bottom)
362  int qs_last; ///< if qpel has been used in the previous (tr.) picture
363  int bmvtype;
364  int frfd, brfd; ///< reference frame distance (forward or backward)
367 
368  /** Frame decoding info for sprite modes */
369  //@{
374  uint8_t* sr_rows[2][2]; ///< Sprite resizer line cache
375  //@}
376 
378  int bi_type;
379  int x8_type;
380 
381  int16_t (*block)[6][64];
383  uint32_t *cbp_base, *cbp;
385  int16_t (*luma_mv_base)[2], (*luma_mv)[2];
386  uint8_t bfraction_lut_index; ///< Index for BFRACTION value (see Table 40, reproduced into ff_vc1_bfraction_lut[])
387  uint8_t broken_link; ///< Broken link flag (BROKEN_LINK syntax element)
388  uint8_t closed_entry; ///< Closed entry point flag (CLOSED_ENTRY syntax element)
389 
390  int end_mb_x; ///< Horizontal macroblock limit (used only by mss2)
391 
392  int parse_only; ///< Context is used within parser
393  int resync_marker; ///< could this stream contain resync markers
394 } VC1Context;
395 
396 /**
397  * Decode Simple/Main Profiles sequence header
398  * @see Figure 7-8, p16-17
399  * @param avctx Codec context
400  * @param gb GetBit context initialized from Codec context extra_data
401  * @return Status
402  */
404 
406 
410 
415 
416 #endif /* AVCODEC_VC1_H */