2 * @file libavcodec/vp56.h
3 * VP5 and VP6 compatible video decoder (common features)
5 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
7 * This file is part of FFmpeg.
9 * FFmpeg is free software; you can redistribute it and/or
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.
14 * FFmpeg is distributed in the hope that it will be useful,
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.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #ifndef AVCODEC_VP56_H
25 #define AVCODEC_VP56_H
30 #include "bytestream.h"
33 typedef struct vp56_context VP56Context;
34 typedef struct vp56_mv VP56mv;
36 typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
38 typedef int (*VP56Adjust)(int v, int t);
39 typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
40 int offset1, int offset2, int stride,
41 VP56mv mv, int mask, int select, int luma);
42 typedef void (*VP56ParseCoeff)(VP56Context *s);
43 typedef void (*VP56DefaultModelsInit)(VP56Context *s);
44 typedef void (*VP56ParseVectorModels)(VP56Context *s);
45 typedef void (*VP56ParseCoeffModels)(VP56Context *s);
46 typedef int (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf,
47 int buf_size, int *golden_frame);
52 const uint8_t *buffer;
54 unsigned long code_word;
74 uint8_t coeff_reorder[64]; /* used in vp6 only */
75 uint8_t coeff_index_to_pos[64]; /* used in vp6 only */
76 uint8_t vector_sig[2]; /* delta sign */
77 uint8_t vector_dct[2]; /* delta coding types */
78 uint8_t vector_pdi[2][2]; /* predefined delta init */
79 uint8_t vector_pdv[2][7]; /* predefined delta values */
80 uint8_t vector_fdv[2][8]; /* 8 bit delta value definition */
81 uint8_t coeff_dccv[2][11]; /* DC coeff value */
82 uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
83 uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
84 uint8_t coeff_dcct[2][36][5]; /* DC coeff coding type */
85 uint8_t coeff_runv[2][14]; /* run value (vp6 only) */
86 uint8_t mb_type[3][10][10]; /* model for decoding MB type */
87 uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
91 AVCodecContext *avctx;
96 uint8_t *edge_emu_buffer_alloc;
97 uint8_t *edge_emu_buffer;
106 int mb_width; /* number of horizontal MB */
107 int mb_height; /* number of vertical MB */
113 int8_t *qscale_table;
115 /* DC predictors management */
116 VP56RefDc *above_blocks;
117 VP56RefDc left_block[4];
118 int above_block_idx[6];
119 DCTELEM prev_dc[3][3]; /* [plan][ref_frame] */
121 /* blocks / macroblock */
123 VP56Macroblock *macroblocks;
124 DECLARE_ALIGNED_16(DCTELEM, block_coeff)[6][64];
127 VP56mv mv[6]; /* vectors for each block in MB */
128 VP56mv vector_candidate[2];
129 int vector_candidate_pos;
131 /* filtering hints */
132 int filter_header; /* used in vp6 only */
133 int deblock_filtering;
134 int filter_selection;
136 int max_vector_length;
137 int sample_variance_threshold;
139 uint8_t coeff_ctx[4][64]; /* used in vp5 only */
140 uint8_t coeff_ctx_last[4]; /* used in vp5 only */
144 /* upside-down flipping hints */
145 int flip; /* are we flipping ? */
146 int frbi; /* first row block index in MB */
147 int srbi; /* second row block index in MB */
148 int stride[4]; /* stride for each plan */
150 const uint8_t *vp56_coord_div;
151 VP56ParseVectorAdjustment parse_vector_adjustment;
154 VP56ParseCoeff parse_coeff;
155 VP56DefaultModelsInit default_models_init;
156 VP56ParseVectorModels parse_vector_models;
157 VP56ParseCoeffModels parse_coeff_models;
158 VP56ParseHeader parse_header;
163 /* huffman decoding */
168 VLC ract_vlc[2][3][6];
169 unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
173 void vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
174 int vp56_free(AVCodecContext *avctx);
175 void vp56_init_dequant(VP56Context *s, int quantizer);
176 int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
181 * vp56 specific range coder implementation
184 static inline void vp56_init_range_decoder(VP56RangeCoder *c,
185 const uint8_t *buf, int buf_size)
190 c->end = buf + buf_size;
191 c->code_word = bytestream_get_be16(&c->buffer);
194 static inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
196 unsigned int low = 1 + (((c->high - 1) * prob) / 256);
197 unsigned int low_shift = low << 8;
198 int bit = c->code_word >= low_shift;
202 c->code_word -= low_shift;
208 while (c->high < 128) {
211 if (--c->bits == 0 && c->buffer < c->end) {
213 c->code_word |= *c->buffer++;
219 static inline int vp56_rac_get(VP56RangeCoder *c)
222 int low = (c->high + 1) >> 1;
223 unsigned int low_shift = low << 8;
224 int bit = c->code_word >= low_shift;
226 c->high = (c->high - low) << 1;
227 c->code_word -= low_shift;
234 if (--c->bits == 0 && c->buffer < c->end) {
236 c->code_word |= *c->buffer++;
241 static inline int vp56_rac_gets(VP56RangeCoder *c, int bits)
246 value = (value << 1) | vp56_rac_get(c);
252 static inline int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
254 int v = vp56_rac_gets(c, 7) << 1;
258 static inline int vp56_rac_get_tree(VP56RangeCoder *c,
259 const VP56Tree *tree,
260 const uint8_t *probs)
262 while (tree->val > 0) {
263 if (vp56_rac_get_prob(c, probs[tree->prob_idx]))
271 #endif /* AVCODEC_VP56_H */