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
|
/*
* FFV1 codec for libavcodec
*
* Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_FFV1_H
#define AVCODEC_FFV1_H
#include <stdint.h>
#include "avcodec.h"
#include "get_bits.h"
#include "put_bits.h"
#include "rangecoder.h"
#define MAX_PLANES 4
#define CONTEXT_SIZE 32
#define MAX_QUANT_TABLES 8
#define MAX_CONTEXT_INPUTS 5
extern const uint8_t ff_log2_run[41];
extern const int8_t ffv1_quant5_10bit[256];
extern const int8_t ffv1_quant5[256];
extern const int8_t ffv1_quant9_10bit[256];
extern const int8_t ffv1_quant11[256];
extern const uint8_t ffv1_ver2_state[256];
typedef struct VlcState {
int16_t drift;
uint16_t error_sum;
int8_t bias;
uint8_t count;
} VlcState;
typedef struct PlaneContext {
int16_t quant_table[MAX_CONTEXT_INPUTS][256];
int quant_table_index;
int context_count;
uint8_t (*state)[CONTEXT_SIZE];
VlcState *vlc_state;
uint8_t interlace_bit_state[2];
} PlaneContext;
#define MAX_SLICES 256
typedef struct FFV1Context {
AVClass *class;
AVCodecContext *avctx;
RangeCoder c;
GetBitContext gb;
PutBitContext pb;
uint64_t rc_stat[256][2];
uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2];
int version;
int minor_version;
int width, height;
int chroma_planes;
int chroma_h_shift, chroma_v_shift;
int transparency;
int flags;
int picture_number;
int key_frame;
const AVFrame *frame;
AVFrame *last_picture;
AVFrame *cur;
int plane_count;
int ac; // 1 = range coder <-> 0 = golomb rice
int ac_byte_count; // number of bytes used for AC coding
PlaneContext plane[MAX_PLANES];
int16_t quant_table[MAX_CONTEXT_INPUTS][256];
int16_t quant_tables[MAX_QUANT_TABLES][MAX_CONTEXT_INPUTS][256];
int context_count[MAX_QUANT_TABLES];
uint8_t state_transition[256];
uint8_t (*initial_states[MAX_QUANT_TABLES])[32];
int run_index;
int colorspace;
int16_t *sample_buffer;
int ec;
int slice_damaged;
int key_frame_ok;
int bits_per_raw_sample;
int packed_at_lsb;
int gob_count;
int quant_table_count;
struct FFV1Context *slice_context[MAX_SLICES];
int slice_count;
int num_v_slices;
int num_h_slices;
int slice_width;
int slice_height;
int slice_x;
int slice_y;
} FFV1Context;
static av_always_inline int fold(int diff, int bits)
{
if (bits == 8)
diff = (int8_t)diff;
else {
diff += 1 << (bits - 1);
diff &= (1 << bits) - 1;
diff -= 1 << (bits - 1);
}
return diff;
}
static inline int predict(int16_t *src, int16_t *last)
{
const int LT = last[-1];
const int T = last[0];
const int L = src[-1];
return mid_pred(L, L + T - LT, T);
}
static inline int get_context(PlaneContext *p, int16_t *src,
int16_t *last, int16_t *last2)
{
const int LT = last[-1];
const int T = last[0];
const int RT = last[1];
const int L = src[-1];
if (p->quant_table[3][127]) {
const int TT = last2[0];
const int LL = src[-2];
return p->quant_table[0][(L - LT) & 0xFF] +
p->quant_table[1][(LT - T) & 0xFF] +
p->quant_table[2][(T - RT) & 0xFF] +
p->quant_table[3][(LL - L) & 0xFF] +
p->quant_table[4][(TT - T) & 0xFF];
} else
return p->quant_table[0][(L - LT) & 0xFF] +
p->quant_table[1][(LT - T) & 0xFF] +
p->quant_table[2][(T - RT) & 0xFF];
}
static inline void update_vlc_state(VlcState *const state, const int v)
{
int drift = state->drift;
int count = state->count;
state->error_sum += FFABS(v);
drift += v;
if (count == 128) { // FIXME: variable
count >>= 1;
drift >>= 1;
state->error_sum >>= 1;
}
count++;
if (drift <= -count) {
if (state->bias > -128)
state->bias--;
drift += count;
if (drift <= -count)
drift = -count + 1;
} else if (drift > 0) {
if (state->bias < 127)
state->bias++;
drift -= count;
if (drift > 0)
drift = 0;
}
state->drift = drift;
state->count = count;
}
int ffv1_common_init(AVCodecContext *avctx);
int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs);
int ffv1_init_slice_contexts(FFV1Context *f);
int ffv1_allocate_initial_states(FFV1Context *f);
void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs);
int ffv1_close(AVCodecContext *avctx);
#endif /* AVCODEC_FFV1_H */
|
