const
[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
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24#ifndef FFMPEG_VP56_H
25#define FFMPEG_VP56_H
5ce117c3 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);
7e5cdb5b 46typedef int (*vp56_parse_header_t)(vp56_context_t *s, const uint8_t *buf,
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47 int buf_size, int *golden_frame);
48
49typedef struct {
50 int high;
51 int bits;
7e5cdb5b 52 const 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
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72typedef struct {
73 uint8_t coeff_reorder[64]; /* used in vp6 only */
74 uint8_t coeff_index_to_pos[64]; /* used in vp6 only */
75 uint8_t vector_sig[2]; /* delta sign */
76 uint8_t vector_dct[2]; /* delta coding types */
77 uint8_t vector_pdi[2][2]; /* predefined delta init */
78 uint8_t vector_pdv[2][7]; /* predefined delta values */
79 uint8_t vector_fdv[2][8]; /* 8 bit delta value definition */
80 uint8_t coeff_dccv[2][11]; /* DC coeff value */
81 uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
82 uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
83 uint8_t coeff_dcct[2][36][5]; /* DC coeff coding type */
84 uint8_t coeff_runv[2][14]; /* run value (vp6 only) */
85 uint8_t mb_type[3][10][10]; /* model for decoding MB type */
86 uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
87} vp56_model_t;
88
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89struct vp56_context {
90 AVCodecContext *avctx;
91 DSPContext dsp;
92 ScanTable scantable;
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93 AVFrame frames[4];
94 AVFrame *framep[6];
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95 uint8_t *edge_emu_buffer_alloc;
96 uint8_t *edge_emu_buffer;
97 vp56_range_coder_t c;
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98 vp56_range_coder_t cc;
99 vp56_range_coder_t *ccp;
9110a0e3 100 int sub_version;
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101
102 /* frame info */
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103 int plane_width[4];
104 int plane_height[4];
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105 int mb_width; /* number of horizontal MB */
106 int mb_height; /* number of vertical MB */
107 int block_offset[6];
108
109 int quantizer;
110 uint16_t dequant_dc;
111 uint16_t dequant_ac;
112
113 /* DC predictors management */
114 vp56_ref_dc_t *above_blocks;
115 vp56_ref_dc_t left_block[4];
116 int above_block_idx[6];
117 DCTELEM prev_dc[3][3]; /* [plan][ref_frame] */
118
119 /* blocks / macroblock */
120 vp56_mb_t mb_type;
121 vp56_macroblock_t *macroblocks;
122 DECLARE_ALIGNED_16(DCTELEM, block_coeff[6][64]);
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123
124 /* motion vectors */
125 vp56_mv_t mv[6]; /* vectors for each block in MB */
126 vp56_mv_t vector_candidate[2];
127 int vector_candidate_pos;
128
129 /* filtering hints */
dd9b8635 130 int filter_header; /* used in vp6 only */
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131 int deblock_filtering;
132 int filter_selection;
133 int filter_mode;
134 int max_vector_length;
135 int sample_variance_threshold;
136
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137 uint8_t coeff_ctx[4][64]; /* used in vp5 only */
138 uint8_t coeff_ctx_last[4]; /* used in vp5 only */
139
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140 int has_alpha;
141
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142 /* upside-down flipping hints */
143 int flip; /* are we flipping ? */
144 int frbi; /* first row block index in MB */
145 int srbi; /* second row block index in MB */
91fc2cf1 146 int stride[4]; /* stride for each plan */
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147
148 const uint8_t *vp56_coord_div;
149 vp56_parse_vector_adjustment_t parse_vector_adjustment;
150 vp56_adjust_t adjust;
151 vp56_filter_t filter;
152 vp56_parse_coeff_t parse_coeff;
153 vp56_default_models_init_t default_models_init;
154 vp56_parse_vector_models_t parse_vector_models;
155 vp56_parse_coeff_models_t parse_coeff_models;
156 vp56_parse_header_t parse_header;
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157
158 vp56_model_t *modelp;
91fc2cf1 159 vp56_model_t models[2];
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160
161 /* huffman decoding */
162 int use_huffman;
163 GetBitContext gb;
164 VLC dccv_vlc[2];
165 VLC runv_vlc[2];
166 VLC ract_vlc[2][3][6];
167 unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
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168};
169
170
91fc2cf1 171void vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
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172int vp56_free(AVCodecContext *avctx);
173void vp56_init_dequant(vp56_context_t *s, int quantizer);
174int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
7e5cdb5b 175 const uint8_t *buf, int buf_size);
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176
177
178/**
179 * vp56 specific range coder implementation
180 */
181
182static inline void vp56_init_range_decoder(vp56_range_coder_t *c,
7e5cdb5b 183 const uint8_t *buf, int buf_size)
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184{
185 c->high = 255;
186 c->bits = 8;
187 c->buffer = buf;
2c124cb6 188 c->code_word = bytestream_get_be16(&c->buffer);
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189}
190
191static inline int vp56_rac_get_prob(vp56_range_coder_t *c, uint8_t prob)
192{
193 unsigned int low = 1 + (((c->high - 1) * prob) / 256);
194 unsigned int low_shift = low << 8;
195 int bit = c->code_word >= low_shift;
196
197 if (bit) {
198 c->high -= low;
199 c->code_word -= low_shift;
200 } else {
201 c->high = low;
202 }
203
204 /* normalize */
205 while (c->high < 128) {
206 c->high <<= 1;
207 c->code_word <<= 1;
208 if (--c->bits == 0) {
209 c->bits = 8;
210 c->code_word |= *c->buffer++;
211 }
212 }
213 return bit;
214}
215
216static inline int vp56_rac_get(vp56_range_coder_t *c)
217{
218 /* equiprobable */
219 int low = (c->high + 1) >> 1;
220 unsigned int low_shift = low << 8;
221 int bit = c->code_word >= low_shift;
222 if (bit) {
223 c->high = (c->high - low) << 1;
224 c->code_word -= low_shift;
225 } else {
226 c->high = low << 1;
227 }
228
229 /* normalize */
230 c->code_word <<= 1;
231 if (--c->bits == 0) {
232 c->bits = 8;
233 c->code_word |= *c->buffer++;
234 }
235 return bit;
236}
237
238static inline int vp56_rac_gets(vp56_range_coder_t *c, int bits)
239{
240 int value = 0;
241
242 while (bits--) {
243 value = (value << 1) | vp56_rac_get(c);
244 }
245
246 return value;
247}
248
249static inline int vp56_rac_gets_nn(vp56_range_coder_t *c, int bits)
250{
251 int v = vp56_rac_gets(c, 7) << 1;
252 return v + !v;
253}
254
255static inline int vp56_rac_get_tree(vp56_range_coder_t *c,
256 const vp56_tree_t *tree,
257 const uint8_t *probs)
258{
259 while (tree->val > 0) {
260 if (vp56_rac_get_prob(c, probs[tree->prob_idx]))
261 tree += tree->val;
262 else
263 tree++;
264 }
265 return -tree->val;
266}
267
5b21bdab 268#endif /* FFMPEG_VP56_H */