vp56: Drop unnecessary cabac.h #include.
[libav.git] / libavcodec / vp56.h
CommitLineData
6168781f 1/*
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2 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
3 *
2912e87a 4 * This file is part of Libav.
b78e7197 5 *
2912e87a 6 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 11 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 17 * License along with Libav; if not, write to the Free Software
e5a389a1 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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19 */
20
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21/**
22 * @file
23 * VP5 and VP6 compatible video decoder (common features)
24 */
25
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26#ifndef AVCODEC_VP56_H
27#define AVCODEC_VP56_H
5ce117c3 28
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29#include "vp56data.h"
30#include "dsputil.h"
9106a698 31#include "get_bits.h"
2c124cb6 32#include "bytestream.h"
5e1ba34b 33#include "vp56dsp.h"
5ce117c3 34
3d52bca6 35typedef struct vp56_context VP56Context;
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36
37typedef struct {
38 int16_t x;
39 int16_t y;
40} DECLARE_ALIGNED(4, , VP56mv);
5ce117c3 41
3d52bca6 42typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
76025d91 43 VP56mv *vect);
3d52bca6 44typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
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45 int offset1, int offset2, int stride,
46 VP56mv mv, int mask, int select, int luma);
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47typedef void (*VP56ParseCoeff)(VP56Context *s);
48typedef void (*VP56DefaultModelsInit)(VP56Context *s);
49typedef void (*VP56ParseVectorModels)(VP56Context *s);
066fff75 50typedef int (*VP56ParseCoeffModels)(VP56Context *s);
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51typedef int (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf,
52 int buf_size, int *golden_frame);
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53
54typedef struct {
55 int high;
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56 int bits; /* stored negated (i.e. negative "bits" is a positive number of
57 bits left) in order to eliminate a negate in cache refilling */
7e5cdb5b 58 const uint8_t *buffer;
7576516a 59 const uint8_t *end;
24675b80 60 unsigned int code_word;
3d52bca6 61} VP56RangeCoder;
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62
63typedef struct {
64 uint8_t not_null_dc;
3d52bca6 65 VP56Frame ref_frame;
5ce117c3 66 DCTELEM dc_coeff;
3d52bca6 67} VP56RefDc;
5ce117c3 68
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69typedef struct {
70 uint8_t type;
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71 VP56mv mv;
72} VP56Macroblock;
5ce117c3 73
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74typedef struct {
75 uint8_t coeff_reorder[64]; /* used in vp6 only */
76 uint8_t coeff_index_to_pos[64]; /* used in vp6 only */
77 uint8_t vector_sig[2]; /* delta sign */
78 uint8_t vector_dct[2]; /* delta coding types */
79 uint8_t vector_pdi[2][2]; /* predefined delta init */
80 uint8_t vector_pdv[2][7]; /* predefined delta values */
81 uint8_t vector_fdv[2][8]; /* 8 bit delta value definition */
82 uint8_t coeff_dccv[2][11]; /* DC coeff value */
83 uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
84 uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
85 uint8_t coeff_dcct[2][36][5]; /* DC coeff coding type */
86 uint8_t coeff_runv[2][14]; /* run value (vp6 only) */
87 uint8_t mb_type[3][10][10]; /* model for decoding MB type */
88 uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
d887151d 89} VP56Model;
247df384 90
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91struct vp56_context {
92 AVCodecContext *avctx;
93 DSPContext dsp;
5e1ba34b 94 VP56DSPContext vp56dsp;
5ce117c3 95 ScanTable scantable;
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96 AVFrame frames[4];
97 AVFrame *framep[6];
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98 uint8_t *edge_emu_buffer_alloc;
99 uint8_t *edge_emu_buffer;
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100 VP56RangeCoder c;
101 VP56RangeCoder cc;
102 VP56RangeCoder *ccp;
9110a0e3 103 int sub_version;
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104
105 /* frame info */
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106 int plane_width[4];
107 int plane_height[4];
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108 int mb_width; /* number of horizontal MB */
109 int mb_height; /* number of vertical MB */
110 int block_offset[6];
111
112 int quantizer;
113 uint16_t dequant_dc;
114 uint16_t dequant_ac;
800274f8 115 int8_t *qscale_table;
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116
117 /* DC predictors management */
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118 VP56RefDc *above_blocks;
119 VP56RefDc left_block[4];
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120 int above_block_idx[6];
121 DCTELEM prev_dc[3][3]; /* [plan][ref_frame] */
122
123 /* blocks / macroblock */
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124 VP56mb mb_type;
125 VP56Macroblock *macroblocks;
84dc2d8a 126 DECLARE_ALIGNED(16, DCTELEM, block_coeff)[6][64];
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127
128 /* motion vectors */
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129 VP56mv mv[6]; /* vectors for each block in MB */
130 VP56mv vector_candidate[2];
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131 int vector_candidate_pos;
132
133 /* filtering hints */
dd9b8635 134 int filter_header; /* used in vp6 only */
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135 int deblock_filtering;
136 int filter_selection;
137 int filter_mode;
138 int max_vector_length;
139 int sample_variance_threshold;
140
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141 uint8_t coeff_ctx[4][64]; /* used in vp5 only */
142 uint8_t coeff_ctx_last[4]; /* used in vp5 only */
143
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144 int has_alpha;
145
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146 /* upside-down flipping hints */
147 int flip; /* are we flipping ? */
148 int frbi; /* first row block index in MB */
149 int srbi; /* second row block index in MB */
91fc2cf1 150 int stride[4]; /* stride for each plan */
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151
152 const uint8_t *vp56_coord_div;
3d52bca6 153 VP56ParseVectorAdjustment parse_vector_adjustment;
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154 VP56Filter filter;
155 VP56ParseCoeff parse_coeff;
156 VP56DefaultModelsInit default_models_init;
157 VP56ParseVectorModels parse_vector_models;
158 VP56ParseCoeffModels parse_coeff_models;
159 VP56ParseHeader parse_header;
160
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161 VP56Model *modelp;
162 VP56Model models[2];
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163
164 /* huffman decoding */
165 int use_huffman;
166 GetBitContext gb;
167 VLC dccv_vlc[2];
168 VLC runv_vlc[2];
169 VLC ract_vlc[2][3][6];
170 unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
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171};
172
173
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174void ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
175int ff_vp56_free(AVCodecContext *avctx);
176void ff_vp56_init_dequant(VP56Context *s, int quantizer);
177int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
52fa2054 178 AVPacket *avpkt);
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179
180
181/**
182 * vp56 specific range coder implementation
183 */
184
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185extern const uint8_t ff_vp56_norm_shift[256];
186void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size);
5ce117c3 187
5474ec2a 188static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c)
b3d755ec 189{
905ef0d0 190 int shift = ff_vp56_norm_shift[c->high];
b3d755ec 191 int bits = c->bits;
5474ec2a 192 unsigned int code_word = c->code_word;
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193
194 c->high <<= shift;
195 code_word <<= shift;
196 bits += shift;
197 if(bits >= 0 && c->buffer < c->end) {
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198 code_word |= bytestream_get_be16(&c->buffer) << bits;
199 bits -= 16;
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200 }
201 c->bits = bits;
5474ec2a 202 return code_word;
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203}
204
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205#if ARCH_ARM
206#include "arm/vp56_arith.h"
207#elif ARCH_X86
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208#include "x86/vp56_arith.h"
209#endif
210
211#ifndef vp56_rac_get_prob
212#define vp56_rac_get_prob vp56_rac_get_prob
cd2769c1 213static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
5ce117c3 214{
5474ec2a 215 unsigned int code_word = vp56_rac_renorm(c);
c6ef6e14 216 unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
05c04cdf 217 unsigned int low_shift = low << 16;
4148855e 218 int bit = code_word >= low_shift;
5ce117c3 219
36d6b545 220 c->high = bit ? c->high - low : low;
5474ec2a 221 c->code_word = bit ? code_word - low_shift : code_word;
5ce117c3 222
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223 return bit;
224}
3611e7a3 225#endif
5ce117c3 226
7da48fd0 227#ifndef vp56_rac_get_prob_branchy
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228// branchy variant, to be used where there's a branch based on the bit decoded
229static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
230{
231 unsigned long code_word = vp56_rac_renorm(c);
232 unsigned low = 1 + (((c->high - 1) * prob) >> 8);
05c04cdf 233 unsigned low_shift = low << 16;
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234
235 if (code_word >= low_shift) {
236 c->high -= low;
237 c->code_word = code_word - low_shift;
238 return 1;
239 }
240
241 c->high = low;
242 c->code_word = code_word;
243 return 0;
244}
7da48fd0 245#endif
fe1b5d97 246
cd2769c1 247static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
5ce117c3 248{
5474ec2a 249 unsigned int code_word = vp56_rac_renorm(c);
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250 /* equiprobable */
251 int low = (c->high + 1) >> 1;
05c04cdf 252 unsigned int low_shift = low << 16;
5474ec2a 253 int bit = code_word >= low_shift;
5ce117c3 254 if (bit) {
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255 c->high -= low;
256 code_word -= low_shift;
5ce117c3 257 } else {
5474ec2a 258 c->high = low;
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259 }
260
5474ec2a 261 c->code_word = code_word;
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262 return bit;
263}
264
3b636f21 265// rounding is different than vp56_rac_get, is vp56_rac_get wrong?
cd2769c1 266static av_always_inline int vp8_rac_get(VP56RangeCoder *c)
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267{
268 return vp56_rac_get_prob(c, 128);
269}
270
61ee75bb 271static av_unused int vp56_rac_gets(VP56RangeCoder *c, int bits)
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272{
273 int value = 0;
274
275 while (bits--) {
276 value = (value << 1) | vp56_rac_get(c);
277 }
278
279 return value;
280}
281
61ee75bb 282static av_unused int vp8_rac_get_uint(VP56RangeCoder *c, int bits)
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283{
284 int value = 0;
285
286 while (bits--) {
287 value = (value << 1) | vp8_rac_get(c);
288 }
289
290 return value;
291}
292
293// fixme: add 1 bit to all the calls to this?
61ee75bb 294static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits)
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295{
296 int v;
297
298 if (!vp8_rac_get(c))
299 return 0;
300
301 v = vp8_rac_get_uint(c, bits);
302
303 if (vp8_rac_get(c))
304 v = -v;
305
306 return v;
307}
308
309// P(7)
61ee75bb 310static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
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311{
312 int v = vp56_rac_gets(c, 7) << 1;
313 return v + !v;
314}
315
61ee75bb 316static av_unused int vp8_rac_get_nn(VP56RangeCoder *c)
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317{
318 int v = vp8_rac_get_uint(c, 7) << 1;
319 return v + !v;
320}
321
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322static av_always_inline
323int vp56_rac_get_tree(VP56RangeCoder *c,
324 const VP56Tree *tree,
325 const uint8_t *probs)
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326{
327 while (tree->val > 0) {
328 if (vp56_rac_get_prob(c, probs[tree->prob_idx]))
329 tree += tree->val;
330 else
331 tree++;
332 }
333 return -tree->val;
334}
335
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336/**
337 * This is identical to vp8_rac_get_tree except for the possibility of starting
338 * on a node other than the root node, needed for coeff decode where this is
339 * used to save a bit after a 0 token (by disallowing EOB to immediately follow.)
340 */
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341static av_always_inline
342int vp8_rac_get_tree_with_offset(VP56RangeCoder *c, const int8_t (*tree)[2],
343 const uint8_t *probs, int i)
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344{
345 do {
346 i = tree[i][vp56_rac_get_prob(c, probs[i])];
347 } while (i > 0);
348
349 return -i;
350}
351
352// how probabilities are associated with decisions is different I think
353// well, the new scheme fits in the old but this way has one fewer branches per decision
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354static av_always_inline
355int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2],
356 const uint8_t *probs)
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357{
358 return vp8_rac_get_tree_with_offset(c, tree, probs, 0);
359}
360
361// DCTextra
cd2769c1 362static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob)
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363{
364 int v = 0;
365
366 do {
367 v = (v<<1) + vp56_rac_get_prob(c, *prob++);
368 } while (*prob);
369
370 return v;
371}
372
98790382 373#endif /* AVCODEC_VP56_H */