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;
76 uint8_t *edge_emu_buffer_alloc;
77 uint8_t *edge_emu_buffer;
84 int mb_width; /* number of horizontal MB */
85 int mb_height; /* number of vertical MB */
92 /* DC predictors management */
93 vp56_ref_dc_t *above_blocks;
94 vp56_ref_dc_t left_block[4];
95 int above_block_idx[6];
96 DCTELEM prev_dc[3][3]; /* [plan][ref_frame] */
98 /* blocks / macroblock */
100 vp56_macroblock_t *macroblocks;
101 DECLARE_ALIGNED_16(DCTELEM, block_coeff[6][64]);
102 uint8_t coeff_reorder[64]; /* used in vp6 only */
103 uint8_t coeff_index_to_pos[64]; /* used in vp6 only */
106 vp56_mv_t mv[6]; /* vectors for each block in MB */
107 vp56_mv_t vector_candidate[2];
108 int vector_candidate_pos;
110 /* filtering hints */
111 int deblock_filtering;
112 int filter_selection;
114 int max_vector_length;
115 int sample_variance_threshold;
118 uint8_t vector_model_sig[2]; /* delta sign */
119 uint8_t vector_model_dct[2]; /* delta coding types */
120 uint8_t vector_model_pdi[2][2]; /* predefined delta init */
121 uint8_t vector_model_pdv[2][7]; /* predefined delta values */
122 uint8_t vector_model_fdv[2][8]; /* 8 bit delta value definition */
123 uint8_t mb_type_model[3][10][10]; /* model for decoding MB type */
124 uint8_t coeff_model_dccv[2][11]; /* DC coeff value */
125 uint8_t coeff_model_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
126 uint8_t coeff_model_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
127 uint8_t coeff_model_dcct[2][36][5]; /* DC coeff coding type */
128 uint8_t coeff_model_runv[2][14]; /* run value (vp6 only) */
129 uint8_t mb_types_stats[3][10][2]; /* contextual, next MB type stats */
130 uint8_t coeff_ctx[4][64]; /* used in vp5 only */
131 uint8_t coeff_ctx_last[4]; /* used in vp5 only */
133 /* upside-down flipping hints */
134 int flip; /* are we flipping ? */
135 int frbi; /* first row block index in MB */
136 int srbi; /* second row block index in MB */
137 int stride[3]; /* stride for each plan */
139 const uint8_t *vp56_coord_div;
140 vp56_parse_vector_adjustment_t parse_vector_adjustment;
141 vp56_adjust_t adjust;
142 vp56_filter_t filter;
143 vp56_parse_coeff_t parse_coeff;
144 vp56_default_models_init_t default_models_init;
145 vp56_parse_vector_models_t parse_vector_models;
146 vp56_parse_coeff_models_t parse_coeff_models;
147 vp56_parse_header_t parse_header;
151 void vp56_init(vp56_context_t *s, AVCodecContext *avctx, int flip);
152 int vp56_free(AVCodecContext *avctx);
153 void vp56_init_dequant(vp56_context_t *s, int quantizer);
154 int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
155 uint8_t *buf, int buf_size);
159 * vp56 specific range coder implementation
162 static inline void vp56_init_range_decoder(vp56_range_coder_t *c,
163 const uint8_t *buf, int buf_size)
168 c->code_word = *c->buffer++ << 8;
169 c->code_word |= *c->buffer++;
172 static inline int vp56_rac_get_prob(vp56_range_coder_t *c, uint8_t prob)
174 unsigned int low = 1 + (((c->high - 1) * prob) / 256);
175 unsigned int low_shift = low << 8;
176 int bit = c->code_word >= low_shift;
180 c->code_word -= low_shift;
186 while (c->high < 128) {
189 if (--c->bits == 0) {
191 c->code_word |= *c->buffer++;
197 static inline int vp56_rac_get(vp56_range_coder_t *c)
200 int low = (c->high + 1) >> 1;
201 unsigned int low_shift = low << 8;
202 int bit = c->code_word >= low_shift;
204 c->high = (c->high - low) << 1;
205 c->code_word -= low_shift;
212 if (--c->bits == 0) {
214 c->code_word |= *c->buffer++;
219 static inline int vp56_rac_gets(vp56_range_coder_t *c, int bits)
224 value = (value << 1) | vp56_rac_get(c);
230 static inline int vp56_rac_gets_nn(vp56_range_coder_t *c, int bits)
232 int v = vp56_rac_gets(c, 7) << 1;
236 static inline int vp56_rac_get_tree(vp56_range_coder_t *c,
237 const vp56_tree_t *tree,
238 const uint8_t *probs)
240 while (tree->val > 0) {
241 if (vp56_rac_get_prob(c, probs[tree->prob_idx]))