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 St, Fifth Floor, Boston, MA 02110-1301 USA
29 #include "mpegvideo.h"
32 typedef struct vp56_context vp56_context_t;
33 typedef struct vp56_mv vp56_mv_t;
35 typedef void (*vp56_parse_vector_adjustment_t)(vp56_context_t *s,
37 typedef int (*vp56_adjust_t)(int v, int t);
38 typedef void (*vp56_filter_t)(vp56_context_t *s, uint8_t *dst, uint8_t *src,
39 int offset1, int offset2, int stride,
40 vp56_mv_t mv, int mask, int select, int luma);
41 typedef void (*vp56_parse_coeff_t)(vp56_context_t *s);
42 typedef void (*vp56_default_models_init_t)(vp56_context_t *s);
43 typedef void (*vp56_parse_vector_models_t)(vp56_context_t *s);
44 typedef void (*vp56_parse_coeff_models_t)(vp56_context_t *s);
45 typedef int (*vp56_parse_header_t)(vp56_context_t *s, uint8_t *buf,
46 int buf_size, int *golden_frame);
51 const uint8_t *buffer;
52 unsigned long code_word;
57 vp56_frame_t ref_frame;
72 AVCodecContext *avctx;
77 uint8_t *edge_emu_buffer_alloc;
78 uint8_t *edge_emu_buffer;
80 vp56_range_coder_t cc;
81 vp56_range_coder_t *ccp;
87 int mb_width; /* number of horizontal MB */
88 int mb_height; /* number of vertical MB */
95 /* DC predictors management */
96 vp56_ref_dc_t *above_blocks;
97 vp56_ref_dc_t left_block[4];
98 int above_block_idx[6];
99 DCTELEM prev_dc[3][3]; /* [plan][ref_frame] */
101 /* blocks / macroblock */
103 vp56_macroblock_t *macroblocks;
104 DECLARE_ALIGNED_16(DCTELEM, block_coeff[6][64]);
105 uint8_t coeff_reorder[64]; /* used in vp6 only */
106 uint8_t coeff_index_to_pos[64]; /* used in vp6 only */
109 vp56_mv_t mv[6]; /* vectors for each block in MB */
110 vp56_mv_t vector_candidate[2];
111 int vector_candidate_pos;
113 /* filtering hints */
114 int filter_header; /* used in vp6 only */
115 int deblock_filtering;
116 int filter_selection;
118 int max_vector_length;
119 int sample_variance_threshold;
122 uint8_t vector_model_sig[2]; /* delta sign */
123 uint8_t vector_model_dct[2]; /* delta coding types */
124 uint8_t vector_model_pdi[2][2]; /* predefined delta init */
125 uint8_t vector_model_pdv[2][7]; /* predefined delta values */
126 uint8_t vector_model_fdv[2][8]; /* 8 bit delta value definition */
127 uint8_t mb_type_model[3][10][10]; /* model for decoding MB type */
128 uint8_t coeff_model_dccv[2][11]; /* DC coeff value */
129 uint8_t coeff_model_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
130 uint8_t coeff_model_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
131 uint8_t coeff_model_dcct[2][36][5]; /* DC coeff coding type */
132 uint8_t coeff_model_runv[2][14]; /* run value (vp6 only) */
133 uint8_t mb_types_stats[3][10][2]; /* contextual, next MB type stats */
134 uint8_t coeff_ctx[4][64]; /* used in vp5 only */
135 uint8_t coeff_ctx_last[4]; /* used in vp5 only */
137 /* upside-down flipping hints */
138 int flip; /* are we flipping ? */
139 int frbi; /* first row block index in MB */
140 int srbi; /* second row block index in MB */
141 int stride[3]; /* stride for each plan */
143 const uint8_t *vp56_coord_div;
144 vp56_parse_vector_adjustment_t parse_vector_adjustment;
145 vp56_adjust_t adjust;
146 vp56_filter_t filter;
147 vp56_parse_coeff_t parse_coeff;
148 vp56_default_models_init_t default_models_init;
149 vp56_parse_vector_models_t parse_vector_models;
150 vp56_parse_coeff_models_t parse_coeff_models;
151 vp56_parse_header_t parse_header;
155 void vp56_init(vp56_context_t *s, AVCodecContext *avctx, int flip);
156 int vp56_free(AVCodecContext *avctx);
157 void vp56_init_dequant(vp56_context_t *s, int quantizer);
158 int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
159 uint8_t *buf, int buf_size);
163 * vp56 specific range coder implementation
166 static inline void vp56_init_range_decoder(vp56_range_coder_t *c,
167 const uint8_t *buf, int buf_size)
172 c->code_word = *c->buffer++ << 8;
173 c->code_word |= *c->buffer++;
176 static inline int vp56_rac_get_prob(vp56_range_coder_t *c, uint8_t prob)
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;
184 c->code_word -= low_shift;
190 while (c->high < 128) {
193 if (--c->bits == 0) {
195 c->code_word |= *c->buffer++;
201 static inline int vp56_rac_get(vp56_range_coder_t *c)
204 int low = (c->high + 1) >> 1;
205 unsigned int low_shift = low << 8;
206 int bit = c->code_word >= low_shift;
208 c->high = (c->high - low) << 1;
209 c->code_word -= low_shift;
216 if (--c->bits == 0) {
218 c->code_word |= *c->buffer++;
223 static inline int vp56_rac_gets(vp56_range_coder_t *c, int bits)
228 value = (value << 1) | vp56_rac_get(c);
234 static inline int vp56_rac_gets_nn(vp56_range_coder_t *c, int bits)
236 int v = vp56_rac_gets(c, 7) << 1;
240 static inline int vp56_rac_get_tree(vp56_range_coder_t *c,
241 const vp56_tree_t *tree,
242 const uint8_t *probs)
244 while (tree->val > 0) {
245 if (vp56_rac_get_prob(c, probs[tree->prob_idx]))