2 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
4 * This file is part of Libav.
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * VP5 and VP6 compatible video decoder (common features)
26 #ifndef AVCODEC_VP56_H
27 #define AVCODEC_VP56_H
32 #include "bytestream.h"
36 typedef struct vp56_context VP56Context;
39 DECLARE_ALIGNED(4, int16_t, x);
43 typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
45 typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
46 int offset1, int offset2, int stride,
47 VP56mv mv, int mask, int select, int luma);
48 typedef void (*VP56ParseCoeff)(VP56Context *s);
49 typedef void (*VP56DefaultModelsInit)(VP56Context *s);
50 typedef void (*VP56ParseVectorModels)(VP56Context *s);
51 typedef int (*VP56ParseCoeffModels)(VP56Context *s);
52 typedef int (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf,
53 int buf_size, int *golden_frame);
57 int bits; /* stored negated (i.e. negative "bits" is a positive number of
58 bits left) in order to eliminate a negate in cache refilling */
59 const uint8_t *buffer;
61 unsigned int code_word;
76 uint8_t coeff_reorder[64]; /* used in vp6 only */
77 uint8_t coeff_index_to_pos[64]; /* used in vp6 only */
78 uint8_t vector_sig[2]; /* delta sign */
79 uint8_t vector_dct[2]; /* delta coding types */
80 uint8_t vector_pdi[2][2]; /* predefined delta init */
81 uint8_t vector_pdv[2][7]; /* predefined delta values */
82 uint8_t vector_fdv[2][8]; /* 8 bit delta value definition */
83 uint8_t coeff_dccv[2][11]; /* DC coeff value */
84 uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
85 uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
86 uint8_t coeff_dcct[2][36][5]; /* DC coeff coding type */
87 uint8_t coeff_runv[2][14]; /* run value (vp6 only) */
88 uint8_t mb_type[3][10][10]; /* model for decoding MB type */
89 uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
93 AVCodecContext *avctx;
96 VP56DSPContext vp56dsp;
100 uint8_t *edge_emu_buffer_alloc;
101 uint8_t *edge_emu_buffer;
110 int mb_width; /* number of horizontal MB */
111 int mb_height; /* number of vertical MB */
117 int8_t *qscale_table;
119 /* DC predictors management */
120 VP56RefDc *above_blocks;
121 VP56RefDc left_block[4];
122 int above_block_idx[6];
123 DCTELEM prev_dc[3][3]; /* [plan][ref_frame] */
125 /* blocks / macroblock */
127 VP56Macroblock *macroblocks;
128 DECLARE_ALIGNED(16, DCTELEM, block_coeff)[6][64];
131 VP56mv mv[6]; /* vectors for each block in MB */
132 VP56mv vector_candidate[2];
133 int vector_candidate_pos;
135 /* filtering hints */
136 int filter_header; /* used in vp6 only */
137 int deblock_filtering;
138 int filter_selection;
140 int max_vector_length;
141 int sample_variance_threshold;
143 uint8_t coeff_ctx[4][64]; /* used in vp5 only */
144 uint8_t coeff_ctx_last[4]; /* used in vp5 only */
148 /* upside-down flipping hints */
149 int flip; /* are we flipping ? */
150 int frbi; /* first row block index in MB */
151 int srbi; /* second row block index in MB */
152 int stride[4]; /* stride for each plan */
154 const uint8_t *vp56_coord_div;
155 VP56ParseVectorAdjustment parse_vector_adjustment;
157 VP56ParseCoeff parse_coeff;
158 VP56DefaultModelsInit default_models_init;
159 VP56ParseVectorModels parse_vector_models;
160 VP56ParseCoeffModels parse_coeff_models;
161 VP56ParseHeader parse_header;
166 /* huffman decoding */
171 VLC ract_vlc[2][3][6];
172 unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
176 void ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
177 int ff_vp56_free(AVCodecContext *avctx);
178 void ff_vp56_init_dequant(VP56Context *s, int quantizer);
179 int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
184 * vp56 specific range coder implementation
187 extern const uint8_t ff_vp56_norm_shift[256];
188 void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size);
190 static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c)
192 int shift = ff_vp56_norm_shift[c->high];
194 unsigned int code_word = c->code_word;
199 if(bits >= 0 && c->buffer < c->end) {
200 code_word |= bytestream_get_be16(&c->buffer) << bits;
208 #include "arm/vp56_arith.h"
210 #include "x86/vp56_arith.h"
213 #ifndef vp56_rac_get_prob
214 #define vp56_rac_get_prob vp56_rac_get_prob
215 static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
217 unsigned int code_word = vp56_rac_renorm(c);
218 unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
219 unsigned int low_shift = low << 16;
220 int bit = code_word >= low_shift;
222 c->high = bit ? c->high - low : low;
223 c->code_word = bit ? code_word - low_shift : code_word;
229 #ifndef vp56_rac_get_prob_branchy
230 // branchy variant, to be used where there's a branch based on the bit decoded
231 static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
233 unsigned long code_word = vp56_rac_renorm(c);
234 unsigned low = 1 + (((c->high - 1) * prob) >> 8);
235 unsigned low_shift = low << 16;
237 if (code_word >= low_shift) {
239 c->code_word = code_word - low_shift;
244 c->code_word = code_word;
249 static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
251 unsigned int code_word = vp56_rac_renorm(c);
253 int low = (c->high + 1) >> 1;
254 unsigned int low_shift = low << 16;
255 int bit = code_word >= low_shift;
258 code_word -= low_shift;
263 c->code_word = code_word;
267 // rounding is different than vp56_rac_get, is vp56_rac_get wrong?
268 static av_always_inline int vp8_rac_get(VP56RangeCoder *c)
270 return vp56_rac_get_prob(c, 128);
273 static av_unused int vp56_rac_gets(VP56RangeCoder *c, int bits)
278 value = (value << 1) | vp56_rac_get(c);
284 static av_unused int vp8_rac_get_uint(VP56RangeCoder *c, int bits)
289 value = (value << 1) | vp8_rac_get(c);
295 // fixme: add 1 bit to all the calls to this?
296 static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits)
303 v = vp8_rac_get_uint(c, bits);
312 static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
314 int v = vp56_rac_gets(c, 7) << 1;
318 static av_unused int vp8_rac_get_nn(VP56RangeCoder *c)
320 int v = vp8_rac_get_uint(c, 7) << 1;
324 static av_always_inline
325 int vp56_rac_get_tree(VP56RangeCoder *c,
326 const VP56Tree *tree,
327 const uint8_t *probs)
329 while (tree->val > 0) {
330 if (vp56_rac_get_prob(c, probs[tree->prob_idx]))
339 * This is identical to vp8_rac_get_tree except for the possibility of starting
340 * on a node other than the root node, needed for coeff decode where this is
341 * used to save a bit after a 0 token (by disallowing EOB to immediately follow.)
343 static av_always_inline
344 int vp8_rac_get_tree_with_offset(VP56RangeCoder *c, const int8_t (*tree)[2],
345 const uint8_t *probs, int i)
348 i = tree[i][vp56_rac_get_prob(c, probs[i])];
354 // how probabilities are associated with decisions is different I think
355 // well, the new scheme fits in the old but this way has one fewer branches per decision
356 static av_always_inline
357 int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2],
358 const uint8_t *probs)
360 return vp8_rac_get_tree_with_offset(c, tree, probs, 0);
364 static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob)
369 v = (v<<1) + vp56_rac_get_prob(c, *prob++);
375 #endif /* AVCODEC_VP56_H */