3 * Copyright (c) 2007 Kamil Nowosad
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 * @author Kamil Nowosad
35 J2K_SOC = 0xff4f, ///< start of codestream
36 J2K_SIZ = 0xff51, ///< image and tile size
37 J2K_COD, ///< coding style default
38 J2K_COC, ///< coding style component
39 J2K_TLM = 0xff55, ///< packed packet headers, tile-part header
40 J2K_PLM = 0xff57, ///< tile-part lengths
41 J2K_PLT, ///< packet length, main header
42 J2K_QCD = 0xff5c, ///< quantization default
43 J2K_QCC, ///< quantization component
44 J2K_RGN, ///< region of interest
45 J2K_POC, ///< progression order change
46 J2K_PPM, ///< packet length, tile-part header
47 J2K_PPT, ///< packed packet headers, main header
48 J2K_CRG = 0xff63, ///< component registration
50 J2K_SOT = 0xff90, ///< start of tile-part
51 J2K_SOP, ///< start of packet
52 J2K_EPH, ///< end of packet header
53 J2K_SOD, ///< start of data
54 J2K_EOC = 0xffd9, ///< end of codestream
57 enum J2kQuantsty{ ///< quantization style
58 J2K_QSTY_NONE, ///< no quantization
59 J2K_QSTY_SI, ///< scalar derived
60 J2K_QSTY_SE ///< scalar expoounded
63 #define J2K_MAX_CBLKW 64
64 #define J2K_MAX_CBLKH 64
67 // flags determining significance of neighbour coefficients
68 #define J2K_T1_SIG_N 0x0001
69 #define J2K_T1_SIG_E 0x0002
70 #define J2K_T1_SIG_W 0x0004
71 #define J2K_T1_SIG_S 0x0008
72 #define J2K_T1_SIG_NE 0x0010
73 #define J2K_T1_SIG_NW 0x0020
74 #define J2K_T1_SIG_SE 0x0040
75 #define J2K_T1_SIG_SW 0x0080
76 #define J2K_T1_SIG_NB (J2K_T1_SIG_N | J2K_T1_SIG_E | J2K_T1_SIG_S | J2K_T1_SIG_W \
77 |J2K_T1_SIG_NE | J2K_T1_SIG_NW | J2K_T1_SIG_SE | J2K_T1_SIG_SW)
78 // flags determining sign bit of neighbour coefficients
79 #define J2K_T1_SGN_N 0x0100
80 #define J2K_T1_SGN_S 0x0200
81 #define J2K_T1_SGN_W 0x0400
82 #define J2K_T1_SGN_E 0x0800
84 #define J2K_T1_VIS 0x1000
85 #define J2K_T1_SIG 0x2000
86 #define J2K_T1_REF 0x4000
88 #define J2K_T1_SGN 0x8000
90 // Codeblock coding styles
91 #define J2K_CBLK_BYPASS 0x01 // Selective arithmetic coding bypass
92 #define J2K_CBLK_RESET 0x02 // Reset context probabilities
93 #define J2K_CBLK_TERMALL 0x04 // Terminate after each coding pass
94 #define J2K_CBLK_VSC 0x08 // Vertical stripe causal context formation
95 #define J2K_CBLK_PREDTERM 0x10 // Predictable termination
96 #define J2K_CBLK_SEGSYM 0x20 // Segmentation symbols present
99 #define J2K_CSTY_PREC 0x01 // Precincts defined in coding style
100 #define J2K_CSTY_SOP 0x02 // SOP marker present
101 #define J2K_CSTY_EPH 0x04 // EPH marker present
104 int data[J2K_MAX_CBLKW][J2K_MAX_CBLKH];
105 int flags[J2K_MAX_CBLKW+2][J2K_MAX_CBLKH+2];
109 typedef struct J2kTgtNode {
112 struct J2kTgtNode *parent;
116 uint8_t nreslevels; ///< number of resolution levels
117 uint8_t log2_cblk_width,
118 log2_cblk_height; ///< exponent of codeblock size
119 uint8_t transform; ///< DWT type
120 uint8_t csty; ///< coding style
121 uint8_t log2_prec_width,
122 log2_prec_height; ///< precinct size
123 uint8_t nlayers; ///< number of layers
124 uint8_t mct; ///< multiple component transformation
125 uint8_t cblk_style; ///< codeblock coding style
129 uint8_t expn[32 * 3]; ///< quantization exponent
130 uint16_t mant[32 * 3]; ///< quantization mantissa
131 uint8_t quantsty; ///< quantization style
132 uint8_t nguardbits; ///< number of guard bits
142 uint8_t ninclpasses; ///< number coding of passes included in codestream
150 } J2kCblk; ///< code block
153 uint16_t xi0, xi1, yi0, yi1; ///< codeblock indexes ([xi0, xi1))
154 J2kTgtNode *zerobits;
155 J2kTgtNode *cblkincl;
156 } J2kPrec; ///< precinct
159 uint16_t coord[2][2]; ///< border coordinates {{x0, x1}, {y0, y1}}
160 uint16_t codeblock_width, codeblock_height;
161 uint16_t cblknx, cblkny;
162 uint32_t stepsize; ///< quantization stepsize (* 2^13)
165 } J2kBand; ///< subband
169 uint16_t coord[2][2]; ///< border coordinates {{x0, x1}, {y0, y1}}
170 uint16_t num_precincts_x, num_precincts_y; ///< number of precincts in x/y direction
171 uint8_t log2_prec_width, log2_prec_height; ///< exponent of precinct size
173 } J2kResLevel; ///< resolution level
176 J2kResLevel *reslevel;
179 uint16_t coord[2][2]; ///< border coordinates {{x0, x1}, {y0, y1}}
186 void ff_j2k_printv(int *tab, int l);
187 void ff_j2k_printu(uint8_t *tab, int l);
191 static inline int ff_j2k_ceildivpow2(int a, int b)
193 return (a + (1 << b) - 1)>> b;
196 static inline int ff_j2k_ceildiv(int a, int b)
198 return (a + b - 1) / b;
201 /* tag tree routines */
202 J2kTgtNode *ff_j2k_tag_tree_init(int w, int h);
204 /* TIER-1 routines */
205 void ff_j2k_init_tier1_luts(void);
207 void ff_j2k_set_significant(J2kT1Context *t1, int x, int y, int negative);
209 extern uint8_t ff_j2k_nbctxno_lut[256][4];
211 static inline int ff_j2k_getnbctxno(int flag, int bandno, int vert_causal_ctx_csty_symbol)
213 return ff_j2k_nbctxno_lut[flag&255][bandno];
216 static inline int ff_j2k_getrefctxno(int flag)
218 static const uint8_t refctxno_lut[2][2] = {{14, 15}, {16, 16}};
219 return refctxno_lut[(flag>>14)&1][(flag & 255) != 0];
222 extern uint8_t ff_j2k_sgnctxno_lut[16][16], ff_j2k_xorbit_lut[16][16];
224 static inline int ff_j2k_getsgnctxno(int flag, int *xorbit)
226 *xorbit = ff_j2k_xorbit_lut[flag&15][(flag>>8)&15];
227 return ff_j2k_sgnctxno_lut[flag&15][(flag>>8)&15];
230 int ff_j2k_init_component(J2kComponent *comp, J2kCodingStyle *codsty, J2kQuantStyle *qntsty, int cbps, int dx, int dy);
231 void ff_j2k_reinit(J2kComponent *comp, J2kCodingStyle *codsty);
232 void ff_j2k_cleanup(J2kComponent *comp, J2kCodingStyle *codsty);
234 #endif /* AVCODEC_J2K_H */