cosmetics: Sort CODEC_ID list.
[libav.git] / libavcodec / vp56.h
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1/**
2 * @file vp56.h
3 * VP5 and VP6 compatible video decoder (common features)
4 *
5 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
6 *
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7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
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10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
b78e7197 14 * FFmpeg is distributed in the hope that it will be useful,
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15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
b78e7197 20 * License along with FFmpeg; if not, write to the Free Software
e5a389a1 21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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22 */
23
24#ifndef VP56_H
25#define VP56_H
26
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27#include "vp56data.h"
28#include "dsputil.h"
29#include "mpegvideo.h"
2c124cb6 30#include "bytestream.h"
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31
32
33typedef struct vp56_context vp56_context_t;
34typedef struct vp56_mv vp56_mv_t;
35
36typedef void (*vp56_parse_vector_adjustment_t)(vp56_context_t *s,
4fde5060 37 vp56_mv_t *vect);
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38typedef int (*vp56_adjust_t)(int v, int t);
39typedef void (*vp56_filter_t)(vp56_context_t *s, uint8_t *dst, uint8_t *src,
40 int offset1, int offset2, int stride,
41 vp56_mv_t mv, int mask, int select, int luma);
42typedef void (*vp56_parse_coeff_t)(vp56_context_t *s);
43typedef void (*vp56_default_models_init_t)(vp56_context_t *s);
44typedef void (*vp56_parse_vector_models_t)(vp56_context_t *s);
45typedef void (*vp56_parse_coeff_models_t)(vp56_context_t *s);
46typedef int (*vp56_parse_header_t)(vp56_context_t *s, uint8_t *buf,
47 int buf_size, int *golden_frame);
48
49typedef struct {
50 int high;
51 int bits;
977f6a90 52 uint8_t *buffer;
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53 unsigned long code_word;
54} vp56_range_coder_t;
55
56typedef struct {
57 uint8_t not_null_dc;
58 vp56_frame_t ref_frame;
59 DCTELEM dc_coeff;
60} vp56_ref_dc_t;
61
62struct vp56_mv {
63 int x;
64 int y;
65};
66
67typedef struct {
68 uint8_t type;
69 vp56_mv_t mv;
70} vp56_macroblock_t;
71
72struct vp56_context {
73 AVCodecContext *avctx;
74 DSPContext dsp;
75 ScanTable scantable;
76 AVFrame frames[3];
704a2881 77 AVFrame *framep[4];
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78 uint8_t *edge_emu_buffer_alloc;
79 uint8_t *edge_emu_buffer;
80 vp56_range_coder_t c;
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81 vp56_range_coder_t cc;
82 vp56_range_coder_t *ccp;
9110a0e3 83 int sub_version;
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84
85 /* frame info */
86 int plane_width[3];
87 int plane_height[3];
88 int mb_width; /* number of horizontal MB */
89 int mb_height; /* number of vertical MB */
90 int block_offset[6];
91
92 int quantizer;
93 uint16_t dequant_dc;
94 uint16_t dequant_ac;
95
96 /* DC predictors management */
97 vp56_ref_dc_t *above_blocks;
98 vp56_ref_dc_t left_block[4];
99 int above_block_idx[6];
100 DCTELEM prev_dc[3][3]; /* [plan][ref_frame] */
101
102 /* blocks / macroblock */
103 vp56_mb_t mb_type;
104 vp56_macroblock_t *macroblocks;
105 DECLARE_ALIGNED_16(DCTELEM, block_coeff[6][64]);
106 uint8_t coeff_reorder[64]; /* used in vp6 only */
107 uint8_t coeff_index_to_pos[64]; /* used in vp6 only */
108
109 /* motion vectors */
110 vp56_mv_t mv[6]; /* vectors for each block in MB */
111 vp56_mv_t vector_candidate[2];
112 int vector_candidate_pos;
113
114 /* filtering hints */
dd9b8635 115 int filter_header; /* used in vp6 only */
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116 int deblock_filtering;
117 int filter_selection;
118 int filter_mode;
119 int max_vector_length;
120 int sample_variance_threshold;
121
122 /* AC models */
123 uint8_t vector_model_sig[2]; /* delta sign */
124 uint8_t vector_model_dct[2]; /* delta coding types */
125 uint8_t vector_model_pdi[2][2]; /* predefined delta init */
126 uint8_t vector_model_pdv[2][7]; /* predefined delta values */
127 uint8_t vector_model_fdv[2][8]; /* 8 bit delta value definition */
128 uint8_t mb_type_model[3][10][10]; /* model for decoding MB type */
129 uint8_t coeff_model_dccv[2][11]; /* DC coeff value */
130 uint8_t coeff_model_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
131 uint8_t coeff_model_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
132 uint8_t coeff_model_dcct[2][36][5]; /* DC coeff coding type */
133 uint8_t coeff_model_runv[2][14]; /* run value (vp6 only) */
134 uint8_t mb_types_stats[3][10][2]; /* contextual, next MB type stats */
135 uint8_t coeff_ctx[4][64]; /* used in vp5 only */
136 uint8_t coeff_ctx_last[4]; /* used in vp5 only */
137
138 /* upside-down flipping hints */
139 int flip; /* are we flipping ? */
140 int frbi; /* first row block index in MB */
141 int srbi; /* second row block index in MB */
142 int stride[3]; /* stride for each plan */
143
144 const uint8_t *vp56_coord_div;
145 vp56_parse_vector_adjustment_t parse_vector_adjustment;
146 vp56_adjust_t adjust;
147 vp56_filter_t filter;
148 vp56_parse_coeff_t parse_coeff;
149 vp56_default_models_init_t default_models_init;
150 vp56_parse_vector_models_t parse_vector_models;
151 vp56_parse_coeff_models_t parse_coeff_models;
152 vp56_parse_header_t parse_header;
153};
154
155
1457516f 156void vp56_init(AVCodecContext *avctx, int flip);
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157int vp56_free(AVCodecContext *avctx);
158void vp56_init_dequant(vp56_context_t *s, int quantizer);
159int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
160 uint8_t *buf, int buf_size);
161
162
163/**
164 * vp56 specific range coder implementation
165 */
166
167static inline void vp56_init_range_decoder(vp56_range_coder_t *c,
977f6a90 168 uint8_t *buf, int buf_size)
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169{
170 c->high = 255;
171 c->bits = 8;
172 c->buffer = buf;
2c124cb6 173 c->code_word = bytestream_get_be16(&c->buffer);
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174}
175
176static inline int vp56_rac_get_prob(vp56_range_coder_t *c, uint8_t prob)
177{
178 unsigned int low = 1 + (((c->high - 1) * prob) / 256);
179 unsigned int low_shift = low << 8;
180 int bit = c->code_word >= low_shift;
181
182 if (bit) {
183 c->high -= low;
184 c->code_word -= low_shift;
185 } else {
186 c->high = low;
187 }
188
189 /* normalize */
190 while (c->high < 128) {
191 c->high <<= 1;
192 c->code_word <<= 1;
193 if (--c->bits == 0) {
194 c->bits = 8;
195 c->code_word |= *c->buffer++;
196 }
197 }
198 return bit;
199}
200
201static inline int vp56_rac_get(vp56_range_coder_t *c)
202{
203 /* equiprobable */
204 int low = (c->high + 1) >> 1;
205 unsigned int low_shift = low << 8;
206 int bit = c->code_word >= low_shift;
207 if (bit) {
208 c->high = (c->high - low) << 1;
209 c->code_word -= low_shift;
210 } else {
211 c->high = low << 1;
212 }
213
214 /* normalize */
215 c->code_word <<= 1;
216 if (--c->bits == 0) {
217 c->bits = 8;
218 c->code_word |= *c->buffer++;
219 }
220 return bit;
221}
222
223static inline int vp56_rac_gets(vp56_range_coder_t *c, int bits)
224{
225 int value = 0;
226
227 while (bits--) {
228 value = (value << 1) | vp56_rac_get(c);
229 }
230
231 return value;
232}
233
234static inline int vp56_rac_gets_nn(vp56_range_coder_t *c, int bits)
235{
236 int v = vp56_rac_gets(c, 7) << 1;
237 return v + !v;
238}
239
240static inline int vp56_rac_get_tree(vp56_range_coder_t *c,
241 const vp56_tree_t *tree,
242 const uint8_t *probs)
243{
244 while (tree->val > 0) {
245 if (vp56_rac_get_prob(c, probs[tree->prob_idx]))
246 tree += tree->val;
247 else
248 tree++;
249 }
250 return -tree->val;
251}
252
253#endif /* VP56_H */