Libav
ffv1.h
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1 /*
2  * FFV1 codec for libavcodec
3  *
4  * Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of Libav.
7  *
8  * Libav is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * Libav is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #ifndef AVCODEC_FFV1_H
24 #define AVCODEC_FFV1_H
25 
26 #include <stdint.h>
27 
28 #include "avcodec.h"
29 #include "get_bits.h"
30 #include "put_bits.h"
31 #include "rangecoder.h"
32 
33 #define MAX_PLANES 4
34 #define CONTEXT_SIZE 32
35 
36 #define MAX_QUANT_TABLES 8
37 #define MAX_CONTEXT_INPUTS 5
38 
39 extern const uint8_t ff_log2_run[41];
40 
41 extern const int8_t ffv1_quant5_10bit[256];
42 extern const int8_t ffv1_quant5[256];
43 extern const int8_t ffv1_quant9_10bit[256];
44 extern const int8_t ffv1_quant11[256];
45 extern const uint8_t ffv1_ver2_state[256];
46 
47 typedef struct VlcState {
48  int16_t drift;
49  uint16_t error_sum;
50  int8_t bias;
52 } VlcState;
53 
54 typedef struct PlaneContext {
61 } PlaneContext;
62 
63 #define MAX_SLICES 256
64 
65 typedef struct FFV1Context {
66  AVClass *class;
71  uint64_t rc_stat[256][2];
72  uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2];
73  int version;
75  int width, height;
79  int flags;
83 
86  int ac; // 1 = range coder <-> 0 = golomb rice
87  int ac_byte_count; // number of bytes used for AC coding
94  int run_index;
96  int16_t *sample_buffer;
97 
98  int ec;
101 
104 
107 
114  int slice_x;
115  int slice_y;
116 } FFV1Context;
117 
118 static av_always_inline int fold(int diff, int bits)
119 {
120  if (bits == 8)
121  diff = (int8_t)diff;
122  else {
123  diff += 1 << (bits - 1);
124  diff &= (1 << bits) - 1;
125  diff -= 1 << (bits - 1);
126  }
127 
128  return diff;
129 }
130 
131 static inline int predict(int16_t *src, int16_t *last)
132 {
133  const int LT = last[-1];
134  const int T = last[0];
135  const int L = src[-1];
136 
137  return mid_pred(L, L + T - LT, T);
138 }
139 
140 static inline int get_context(PlaneContext *p, int16_t *src,
141  int16_t *last, int16_t *last2)
142 {
143  const int LT = last[-1];
144  const int T = last[0];
145  const int RT = last[1];
146  const int L = src[-1];
147 
148  if (p->quant_table[3][127]) {
149  const int TT = last2[0];
150  const int LL = src[-2];
151  return p->quant_table[0][(L - LT) & 0xFF] +
152  p->quant_table[1][(LT - T) & 0xFF] +
153  p->quant_table[2][(T - RT) & 0xFF] +
154  p->quant_table[3][(LL - L) & 0xFF] +
155  p->quant_table[4][(TT - T) & 0xFF];
156  } else
157  return p->quant_table[0][(L - LT) & 0xFF] +
158  p->quant_table[1][(LT - T) & 0xFF] +
159  p->quant_table[2][(T - RT) & 0xFF];
160 }
161 
162 static inline void update_vlc_state(VlcState *const state, const int v)
163 {
164  int drift = state->drift;
165  int count = state->count;
166  state->error_sum += FFABS(v);
167  drift += v;
168 
169  if (count == 128) { // FIXME: variable
170  count >>= 1;
171  drift >>= 1;
172  state->error_sum >>= 1;
173  }
174  count++;
175 
176  if (drift <= -count) {
177  if (state->bias > -128)
178  state->bias--;
179 
180  drift += count;
181  if (drift <= -count)
182  drift = -count + 1;
183  } else if (drift > 0) {
184  if (state->bias < 127)
185  state->bias++;
186 
187  drift -= count;
188  if (drift > 0)
189  drift = 0;
190  }
191 
192  state->drift = drift;
193  state->count = count;
194 }
195 
202 
203 #endif /* AVCODEC_FFV1_H */
static av_always_inline int fold(int diff, int bits)
Definition: ffv1.h:118
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
int flags
Definition: ffv1.h:79
int ffv1_close(AVCodecContext *avctx)
Definition: ffv1.c:265
int16_t quant_table[MAX_CONTEXT_INPUTS][256]
Definition: ffv1.h:55
int quant_table_count
Definition: ffv1.h:106
int slice_height
Definition: ffv1.h:113
#define MAX_CONTEXT_INPUTS
Definition: ffv1.h:37
int16_t * sample_buffer
Definition: ffv1.h:96
int version
Definition: ffv1.h:73
Range coder.
uint64_t(*[MAX_QUANT_TABLES] rc_stat2)[32][2]
Definition: ffv1.h:72
int height
Definition: ffv1.h:75
const int8_t ffv1_quant11[256]
Definition: ffv1.c:95
int plane_count
Definition: ffv1.h:85
int slice_damaged
Definition: ffv1.h:99
uint64_t rc_stat[256][2]
Definition: ffv1.h:71
PutBitContext pb
Definition: ffv1.h:70
uint8_t bits
Definition: crc.c:251
uint8_t
int8_t bias
Definition: ffv1.h:50
RangeCoder c
Definition: ffv1.h:68
int slice_y
Definition: ffv1.h:115
uint8_t(*[MAX_QUANT_TABLES] initial_states)[32]
Definition: ffv1.h:93
uint8_t count
Definition: ffv1.h:51
bitstream reader API header.
VlcState * vlc_state
Definition: ffv1.h:59
int minor_version
Definition: ffv1.h:74
int bits_per_raw_sample
Definition: ffv1.h:102
int slice_width
Definition: ffv1.h:112
GetBitContext gb
Definition: ffv1.h:69
AVFrame * cur
Definition: ffv1.h:84
int16_t quant_tables[MAX_QUANT_TABLES][MAX_CONTEXT_INPUTS][256]
Definition: ffv1.h:90
int context_count
Definition: ffv1.h:57
static int predict(int16_t *src, int16_t *last)
Definition: ffv1.h:131
const uint8_t ff_log2_run[41]
Definition: bitstream.c:36
const int8_t ffv1_quant5_10bit[256]
Definition: ffv1.c:38
int ac
Definition: ffv1.h:86
int16_t quant_table[MAX_CONTEXT_INPUTS][256]
Definition: ffv1.h:89
int run_index
Definition: ffv1.h:94
Definition: ffv1.h:47
uint8_t state_transition[256]
Definition: ffv1.h:92
#define T(x)
Definition: vp56_arith.h:29
int num_h_slices
Definition: ffv1.h:111
#define MAX_QUANT_TABLES
Definition: ffv1.h:36
int colorspace
Definition: ffv1.h:95
static int get_context(PlaneContext *p, int16_t *src, int16_t *last, int16_t *last2)
Definition: ffv1.h:140
#define MAX_PLANES
Definition: ffv1.h:33
static void update_vlc_state(VlcState *const state, const int v)
Definition: ffv1.h:162
int slice_count
Definition: ffv1.h:109
#define FFABS(a)
Definition: common.h:52
int ac_byte_count
Definition: ffv1.h:87
int16_t drift
Definition: ffv1.h:48
#define L(x)
Definition: vp56_arith.h:36
int packed_at_lsb
Definition: ffv1.h:103
int context_count[MAX_QUANT_TABLES]
Definition: ffv1.h:91
Libavcodec external API header.
void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
Definition: ffv1.c:238
main external API structure.
Definition: avcodec.h:1044
int ffv1_common_init(AVCodecContext *avctx)
Definition: ffv1.c:134
int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
Definition: ffv1.c:154
Describe the class of an AVClass context structure.
Definition: log.h:33
int ffv1_init_slice_contexts(FFV1Context *f)
Definition: ffv1.c:188
#define mid_pred
Definition: mathops.h:98
int picture_number
Definition: ffv1.h:80
uint16_t error_sum
Definition: ffv1.h:49
int key_frame_ok
Definition: ffv1.h:100
const uint8_t ffv1_ver2_state[256]
Definition: ffv1.c:114
static uint32_t state
Definition: trasher.c:27
#define CONTEXT_SIZE
Definition: ffv1.h:34
int gob_count
Definition: ffv1.h:105
int quant_table_index
Definition: ffv1.h:56
const int8_t ffv1_quant5[256]
Definition: ffv1.c:57
const int8_t ffv1_quant9_10bit[256]
Definition: ffv1.c:76
uint8_t(* state)[CONTEXT_SIZE]
Definition: ffv1.h:58
int chroma_h_shift
Definition: ffv1.h:77
PlaneContext plane[MAX_PLANES]
Definition: ffv1.h:88
int transparency
Definition: ffv1.h:78
int ffv1_allocate_initial_states(FFV1Context *f)
Definition: ffv1.c:223
int chroma_v_shift
Definition: ffv1.h:77
#define MAX_SLICES
Definition: ffv1.h:63
int chroma_planes
Definition: ffv1.h:76
struct FFV1Context * slice_context[MAX_SLICES]
Definition: ffv1.h:108
AVFrame * frame
Definition: ffv1.h:81
uint8_t interlace_bit_state[2]
Definition: ffv1.h:60
#define av_always_inline
Definition: attributes.h:40
int ec
Definition: ffv1.h:98
int num_v_slices
Definition: ffv1.h:110
AVCodecContext * avctx
Definition: ffv1.h:67
int slice_x
Definition: ffv1.h:114
AVFrame * last_picture
Definition: ffv1.h:82
int width
Definition: ffv1.h:75
bitstream writer API