2 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
4 * This file is part of FFmpeg.
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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;
38 typedef struct VP56mv {
39 DECLARE_ALIGNED(4, int16_t, x);
43 #define VP56_SIZE_CHANGE 1
45 typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
47 typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
48 int offset1, int offset2, int stride,
49 VP56mv mv, int mask, int select, int luma);
50 typedef void (*VP56ParseCoeff)(VP56Context *s);
51 typedef void (*VP56DefaultModelsInit)(VP56Context *s);
52 typedef void (*VP56ParseVectorModels)(VP56Context *s);
53 typedef int (*VP56ParseCoeffModels)(VP56Context *s);
54 typedef int (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf,
57 typedef struct VP56RangeCoder {
59 int bits; /* stored negated (i.e. negative "bits" is a positive number of
60 bits left) in order to eliminate a negate in cache refilling */
61 const uint8_t *buffer;
63 unsigned int code_word;
66 typedef struct VP56RefDc {
72 typedef struct VP56Macroblock {
77 typedef struct VP56Model {
78 uint8_t coeff_reorder[64]; /* used in vp6 only */
79 uint8_t coeff_index_to_pos[64]; /* used in vp6 only */
80 uint8_t vector_sig[2]; /* delta sign */
81 uint8_t vector_dct[2]; /* delta coding types */
82 uint8_t vector_pdi[2][2]; /* predefined delta init */
83 uint8_t vector_pdv[2][7]; /* predefined delta values */
84 uint8_t vector_fdv[2][8]; /* 8 bit delta value definition */
85 uint8_t coeff_dccv[2][11]; /* DC coeff value */
86 uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
87 uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
88 uint8_t coeff_dcct[2][36][5]; /* DC coeff coding type */
89 uint8_t coeff_runv[2][14]; /* run value (vp6 only) */
90 uint8_t mb_type[3][10][10]; /* model for decoding MB type */
91 uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
95 AVCodecContext *avctx;
98 VP56DSPContext vp56dsp;
102 uint8_t *edge_emu_buffer_alloc;
103 uint8_t *edge_emu_buffer;
113 int mb_width; /* number of horizontal MB */
114 int mb_height; /* number of vertical MB */
120 int8_t *qscale_table;
122 /* DC predictors management */
123 VP56RefDc *above_blocks;
124 VP56RefDc left_block[4];
125 int above_block_idx[6];
126 DCTELEM prev_dc[3][3]; /* [plan][ref_frame] */
128 /* blocks / macroblock */
130 VP56Macroblock *macroblocks;
131 DECLARE_ALIGNED(16, DCTELEM, block_coeff)[6][64];
134 VP56mv mv[6]; /* vectors for each block in MB */
135 VP56mv vector_candidate[2];
136 int vector_candidate_pos;
138 /* filtering hints */
139 int filter_header; /* used in vp6 only */
140 int deblock_filtering;
141 int filter_selection;
143 int max_vector_length;
144 int sample_variance_threshold;
146 uint8_t coeff_ctx[4][64]; /* used in vp5 only */
147 uint8_t coeff_ctx_last[4]; /* used in vp5 only */
151 /* upside-down flipping hints */
152 int flip; /* are we flipping ? */
153 int frbi; /* first row block index in MB */
154 int srbi; /* second row block index in MB */
155 int stride[4]; /* stride for each plan */
157 const uint8_t *vp56_coord_div;
158 VP56ParseVectorAdjustment parse_vector_adjustment;
160 VP56ParseCoeff parse_coeff;
161 VP56DefaultModelsInit default_models_init;
162 VP56ParseVectorModels parse_vector_models;
163 VP56ParseCoeffModels parse_coeff_models;
164 VP56ParseHeader parse_header;
166 /* for "slice" parallelism between YUV and A */
167 VP56Context *alpha_context;
172 /* huffman decoding */
177 VLC ract_vlc[2][3][6];
178 unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
182 void ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
183 void ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
184 int flip, int has_alpha);
185 int ff_vp56_free(AVCodecContext *avctx);
186 int ff_vp56_free_context(VP56Context *s);
187 void ff_vp56_init_dequant(VP56Context *s, int quantizer);
188 int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
193 * vp56 specific range coder implementation
196 extern const uint8_t ff_vp56_norm_shift[256];
197 void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size);
199 static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c)
201 int shift = ff_vp56_norm_shift[c->high];
203 unsigned int code_word = c->code_word;
208 if(bits >= 0 && c->buffer < c->end) {
209 code_word |= bytestream_get_be16(&c->buffer) << bits;
217 #include "arm/vp56_arith.h"
219 #include "x86/vp56_arith.h"
222 #ifndef vp56_rac_get_prob
223 #define vp56_rac_get_prob vp56_rac_get_prob
224 static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
226 unsigned int code_word = vp56_rac_renorm(c);
227 unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
228 unsigned int low_shift = low << 16;
229 int bit = code_word >= low_shift;
231 c->high = bit ? c->high - low : low;
232 c->code_word = bit ? code_word - low_shift : code_word;
238 #ifndef vp56_rac_get_prob_branchy
239 // branchy variant, to be used where there's a branch based on the bit decoded
240 static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
242 unsigned long code_word = vp56_rac_renorm(c);
243 unsigned low = 1 + (((c->high - 1) * prob) >> 8);
244 unsigned low_shift = low << 16;
246 if (code_word >= low_shift) {
248 c->code_word = code_word - low_shift;
253 c->code_word = code_word;
258 static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
260 unsigned int code_word = vp56_rac_renorm(c);
262 int low = (c->high + 1) >> 1;
263 unsigned int low_shift = low << 16;
264 int bit = code_word >= low_shift;
267 code_word -= low_shift;
272 c->code_word = code_word;
276 // rounding is different than vp56_rac_get, is vp56_rac_get wrong?
277 static av_always_inline int vp8_rac_get(VP56RangeCoder *c)
279 return vp56_rac_get_prob(c, 128);
282 static av_unused int vp56_rac_gets(VP56RangeCoder *c, int bits)
287 value = (value << 1) | vp56_rac_get(c);
293 static av_unused int vp8_rac_get_uint(VP56RangeCoder *c, int bits)
298 value = (value << 1) | vp8_rac_get(c);
304 // fixme: add 1 bit to all the calls to this?
305 static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits)
312 v = vp8_rac_get_uint(c, bits);
321 static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
323 int v = vp56_rac_gets(c, 7) << 1;
327 static av_unused int vp8_rac_get_nn(VP56RangeCoder *c)
329 int v = vp8_rac_get_uint(c, 7) << 1;
333 static av_always_inline
334 int vp56_rac_get_tree(VP56RangeCoder *c,
335 const VP56Tree *tree,
336 const uint8_t *probs)
338 while (tree->val > 0) {
339 if (vp56_rac_get_prob(c, probs[tree->prob_idx]))
347 // how probabilities are associated with decisions is different I think
348 // well, the new scheme fits in the old but this way has one fewer branches per decision
349 static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2],
350 const uint8_t *probs)
355 i = tree[i][vp56_rac_get_prob(c, probs[i])];
362 static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob)
367 v = (v<<1) + vp56_rac_get_prob(c, *prob++);
373 #endif /* AVCODEC_VP56_H */