1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
/**
* @file vp56.h
* VP5 and VP6 compatible video decoder (common features)
*
* Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef VP56_H
#define VP56_H
#include <stdint.h>
#include "vp56data.h"
#include "dsputil.h"
#include "mpegvideo.h"
typedef struct vp56_context vp56_context_t;
typedef struct vp56_mv vp56_mv_t;
typedef void (*vp56_parse_vector_adjustment_t)(vp56_context_t *s,
vp56_mv_t *vector);
typedef int (*vp56_adjust_t)(int v, int t);
typedef void (*vp56_filter_t)(vp56_context_t *s, uint8_t *dst, uint8_t *src,
int offset1, int offset2, int stride,
vp56_mv_t mv, int mask, int select, int luma);
typedef void (*vp56_parse_coeff_t)(vp56_context_t *s);
typedef void (*vp56_default_models_init_t)(vp56_context_t *s);
typedef void (*vp56_parse_vector_models_t)(vp56_context_t *s);
typedef void (*vp56_parse_coeff_models_t)(vp56_context_t *s);
typedef int (*vp56_parse_header_t)(vp56_context_t *s, uint8_t *buf,
int buf_size, int *golden_frame);
typedef struct {
int high;
int bits;
const uint8_t *buffer;
unsigned long code_word;
} vp56_range_coder_t;
typedef struct {
uint8_t not_null_dc;
vp56_frame_t ref_frame;
DCTELEM dc_coeff;
} vp56_ref_dc_t;
struct vp56_mv {
int x;
int y;
};
typedef struct {
uint8_t type;
vp56_mv_t mv;
} vp56_macroblock_t;
struct vp56_context {
AVCodecContext *avctx;
DSPContext dsp;
ScanTable scantable;
AVFrame frames[3];
uint8_t *edge_emu_buffer_alloc;
uint8_t *edge_emu_buffer;
vp56_range_coder_t c;
/* frame info */
int plane_width[3];
int plane_height[3];
int mb_width; /* number of horizontal MB */
int mb_height; /* number of vertical MB */
int block_offset[6];
int quantizer;
uint16_t dequant_dc;
uint16_t dequant_ac;
/* DC predictors management */
vp56_ref_dc_t *above_blocks;
vp56_ref_dc_t left_block[4];
int above_block_idx[6];
DCTELEM prev_dc[3][3]; /* [plan][ref_frame] */
/* blocks / macroblock */
vp56_mb_t mb_type;
vp56_macroblock_t *macroblocks;
DECLARE_ALIGNED_16(DCTELEM, block_coeff[6][64]);
uint8_t coeff_reorder[64]; /* used in vp6 only */
uint8_t coeff_index_to_pos[64]; /* used in vp6 only */
/* motion vectors */
vp56_mv_t mv[6]; /* vectors for each block in MB */
vp56_mv_t vector_candidate[2];
int vector_candidate_pos;
/* filtering hints */
int deblock_filtering;
int filter_selection;
int filter_mode;
int max_vector_length;
int sample_variance_threshold;
/* AC models */
uint8_t vector_model_sig[2]; /* delta sign */
uint8_t vector_model_dct[2]; /* delta coding types */
uint8_t vector_model_pdi[2][2]; /* predefined delta init */
uint8_t vector_model_pdv[2][7]; /* predefined delta values */
uint8_t vector_model_fdv[2][8]; /* 8 bit delta value definition */
uint8_t mb_type_model[3][10][10]; /* model for decoding MB type */
uint8_t coeff_model_dccv[2][11]; /* DC coeff value */
uint8_t coeff_model_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
uint8_t coeff_model_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
uint8_t coeff_model_dcct[2][36][5]; /* DC coeff coding type */
uint8_t coeff_model_runv[2][14]; /* run value (vp6 only) */
uint8_t mb_types_stats[3][10][2]; /* contextual, next MB type stats */
uint8_t coeff_ctx[4][64]; /* used in vp5 only */
uint8_t coeff_ctx_last[4]; /* used in vp5 only */
/* upside-down flipping hints */
int flip; /* are we flipping ? */
int frbi; /* first row block index in MB */
int srbi; /* second row block index in MB */
int stride[3]; /* stride for each plan */
const uint8_t *vp56_coord_div;
vp56_parse_vector_adjustment_t parse_vector_adjustment;
vp56_adjust_t adjust;
vp56_filter_t filter;
vp56_parse_coeff_t parse_coeff;
vp56_default_models_init_t default_models_init;
vp56_parse_vector_models_t parse_vector_models;
vp56_parse_coeff_models_t parse_coeff_models;
vp56_parse_header_t parse_header;
};
void vp56_init(vp56_context_t *s, AVCodecContext *avctx, int flip);
int vp56_free(AVCodecContext *avctx);
void vp56_init_dequant(vp56_context_t *s, int quantizer);
int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
uint8_t *buf, int buf_size);
/**
* vp56 specific range coder implementation
*/
static inline void vp56_init_range_decoder(vp56_range_coder_t *c,
const uint8_t *buf, int buf_size)
{
c->high = 255;
c->bits = 8;
c->buffer = buf;
c->code_word = *c->buffer++ << 8;
c->code_word |= *c->buffer++;
}
static inline int vp56_rac_get_prob(vp56_range_coder_t *c, uint8_t prob)
{
unsigned int low = 1 + (((c->high - 1) * prob) / 256);
unsigned int low_shift = low << 8;
int bit = c->code_word >= low_shift;
if (bit) {
c->high -= low;
c->code_word -= low_shift;
} else {
c->high = low;
}
/* normalize */
while (c->high < 128) {
c->high <<= 1;
c->code_word <<= 1;
if (--c->bits == 0) {
c->bits = 8;
c->code_word |= *c->buffer++;
}
}
return bit;
}
static inline int vp56_rac_get(vp56_range_coder_t *c)
{
/* equiprobable */
int low = (c->high + 1) >> 1;
unsigned int low_shift = low << 8;
int bit = c->code_word >= low_shift;
if (bit) {
c->high = (c->high - low) << 1;
c->code_word -= low_shift;
} else {
c->high = low << 1;
}
/* normalize */
c->code_word <<= 1;
if (--c->bits == 0) {
c->bits = 8;
c->code_word |= *c->buffer++;
}
return bit;
}
static inline int vp56_rac_gets(vp56_range_coder_t *c, int bits)
{
int value = 0;
while (bits--) {
value = (value << 1) | vp56_rac_get(c);
}
return value;
}
static inline int vp56_rac_gets_nn(vp56_range_coder_t *c, int bits)
{
int v = vp56_rac_gets(c, 7) << 1;
return v + !v;
}
static inline int vp56_rac_get_tree(vp56_range_coder_t *c,
const vp56_tree_t *tree,
const uint8_t *probs)
{
while (tree->val > 0) {
if (vp56_rac_get_prob(c, probs[tree->prob_idx]))
tree += tree->val;
else
tree++;
}
return -tree->val;
}
#endif /* VP56_H */
|
