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"
30 #include "bytestream.h"
33 typedef struct vp56_context vp56_context_t;
34 typedef struct vp56_mv vp56_mv_t;
36 typedef void (*vp56_parse_vector_adjustment_t)(vp56_context_t *s,
38 typedef int (*vp56_adjust_t)(int v, int t);
39 typedef 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);
42 typedef void (*vp56_parse_coeff_t)(vp56_context_t *s);
43 typedef void (*vp56_default_models_init_t)(vp56_context_t *s);
44 typedef void (*vp56_parse_vector_models_t)(vp56_context_t *s);
45 typedef void (*vp56_parse_coeff_models_t)(vp56_context_t *s);
46 typedef int (*vp56_parse_header_t)(vp56_context_t *s, uint8_t *buf,
47 int buf_size, int *golden_frame);
52 const uint8_t *buffer;
53 unsigned long code_word;
58 vp56_frame_t ref_frame;
73 AVCodecContext *avctx;
78 uint8_t *edge_emu_buffer_alloc;
79 uint8_t *edge_emu_buffer;
81 vp56_range_coder_t cc;
82 vp56_range_coder_t *ccp;
88 int mb_width; /* number of horizontal MB */
89 int mb_height; /* number of vertical MB */
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] */
102 /* blocks / macroblock */
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 */
110 vp56_mv_t mv[6]; /* vectors for each block in MB */
111 vp56_mv_t vector_candidate[2];
112 int vector_candidate_pos;
114 /* filtering hints */
115 int filter_header; /* used in vp6 only */
116 int deblock_filtering;
117 int filter_selection;
119 int max_vector_length;
120 int sample_variance_threshold;
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 */
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 */
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;
156 void vp56_init(vp56_context_t *s, AVCodecContext *avctx, int flip);
157 int vp56_free(AVCodecContext *avctx);
158 void vp56_init_dequant(vp56_context_t *s, int quantizer);
159 int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
160 uint8_t *buf, int buf_size);
164 * vp56 specific range coder implementation
167 static inline void vp56_init_range_decoder(vp56_range_coder_t *c,
168 const uint8_t *buf, int buf_size)
173 c->code_word = bytestream_get_be16(&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]))