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 "dsputil.h"
30 #include "get_bits.h"
31 #include "put_bits.h"
32 #include "rangecoder.h"
33 
34 #define MAX_PLANES 4
35 #define CONTEXT_SIZE 32
36 
37 #define MAX_QUANT_TABLES 8
38 #define MAX_CONTEXT_INPUTS 5
39 
40 extern const uint8_t ff_log2_run[41];
41 
42 extern const int8_t ffv1_quant5_10bit[256];
43 extern const int8_t ffv1_quant5[256];
44 extern const int8_t ffv1_quant9_10bit[256];
45 extern const int8_t ffv1_quant11[256];
46 extern const uint8_t ffv1_ver2_state[256];
47 
48 typedef struct VlcState {
49  int16_t drift;
50  uint16_t error_sum;
51  int8_t bias;
53 } VlcState;
54 
55 typedef struct PlaneContext {
62 } PlaneContext;
63 
64 #define MAX_SLICES 256
65 
66 typedef struct FFV1Context {
67  AVClass *class;
72  uint64_t rc_stat[256][2];
73  uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2];
74  int version;
76  int width, height;
80  int flags;
84 
87  int ac; // 1 = range coder <-> 0 = golomb rice
88  int ac_byte_count; // number of bytes used for AC coding
95  int run_index;
97  int16_t *sample_buffer;
98 
99  int ec;
102 
105 
108 
110 
117  int slice_x;
118  int slice_y;
119 } FFV1Context;
120 
121 static av_always_inline int fold(int diff, int bits)
122 {
123  if (bits == 8)
124  diff = (int8_t)diff;
125  else {
126  diff += 1 << (bits - 1);
127  diff &= (1 << bits) - 1;
128  diff -= 1 << (bits - 1);
129  }
130 
131  return diff;
132 }
133 
134 static inline int predict(int16_t *src, int16_t *last)
135 {
136  const int LT = last[-1];
137  const int T = last[0];
138  const int L = src[-1];
139 
140  return mid_pred(L, L + T - LT, T);
141 }
142 
143 static inline int get_context(PlaneContext *p, int16_t *src,
144  int16_t *last, int16_t *last2)
145 {
146  const int LT = last[-1];
147  const int T = last[0];
148  const int RT = last[1];
149  const int L = src[-1];
150 
151  if (p->quant_table[3][127]) {
152  const int TT = last2[0];
153  const int LL = src[-2];
154  return p->quant_table[0][(L - LT) & 0xFF] +
155  p->quant_table[1][(LT - T) & 0xFF] +
156  p->quant_table[2][(T - RT) & 0xFF] +
157  p->quant_table[3][(LL - L) & 0xFF] +
158  p->quant_table[4][(TT - T) & 0xFF];
159  } else
160  return p->quant_table[0][(L - LT) & 0xFF] +
161  p->quant_table[1][(LT - T) & 0xFF] +
162  p->quant_table[2][(T - RT) & 0xFF];
163 }
164 
165 static inline void update_vlc_state(VlcState *const state, const int v)
166 {
167  int drift = state->drift;
168  int count = state->count;
169  state->error_sum += FFABS(v);
170  drift += v;
171 
172  if (count == 128) { // FIXME: variable
173  count >>= 1;
174  drift >>= 1;
175  state->error_sum >>= 1;
176  }
177  count++;
178 
179  if (drift <= -count) {
180  if (state->bias > -128)
181  state->bias--;
182 
183  drift += count;
184  if (drift <= -count)
185  drift = -count + 1;
186  } else if (drift > 0) {
187  if (state->bias < 127)
188  state->bias++;
189 
190  drift -= count;
191  if (drift > 0)
192  drift = 0;
193  }
194 
195  state->drift = drift;
196  state->count = count;
197 }
198 
205 
206 #endif /* AVCODEC_FFV1_H */
static av_always_inline int fold(int diff, int bits)
Definition: ffv1.h:121
This structure describes decoded (raw) audio or video data.
Definition: frame.h:107
int flags
Definition: ffv1.h:80
int ffv1_close(AVCodecContext *avctx)
Definition: ffv1.c:267
int16_t quant_table[MAX_CONTEXT_INPUTS][256]
Definition: ffv1.h:56
int quant_table_count
Definition: ffv1.h:107
int slice_height
Definition: ffv1.h:116
#define MAX_CONTEXT_INPUTS
Definition: ffv1.h:38
int16_t * sample_buffer
Definition: ffv1.h:97
int version
Definition: ffv1.h:74
Range coder.
uint64_t(*[MAX_QUANT_TABLES] rc_stat2)[32][2]
Definition: ffv1.h:73
int height
Definition: ffv1.h:76
const int8_t ffv1_quant11[256]
Definition: ffv1.c:95
int plane_count
Definition: ffv1.h:86
int slice_damaged
Definition: ffv1.h:100
uint64_t rc_stat[256][2]
Definition: ffv1.h:72
PutBitContext pb
Definition: ffv1.h:71
uint8_t bits
Definition: crc.c:216
uint8_t
int8_t bias
Definition: ffv1.h:51
RangeCoder c
Definition: ffv1.h:69
int slice_y
Definition: ffv1.h:118
uint8_t(*[MAX_QUANT_TABLES] initial_states)[32]
Definition: ffv1.h:94
uint8_t count
Definition: ffv1.h:52
bitstream reader API header.
VlcState * vlc_state
Definition: ffv1.h:60
int minor_version
Definition: ffv1.h:75
int bits_per_raw_sample
Definition: ffv1.h:103
int slice_width
Definition: ffv1.h:115
GetBitContext gb
Definition: ffv1.h:70
AVFrame * cur
Definition: ffv1.h:85
int16_t quant_tables[MAX_QUANT_TABLES][MAX_CONTEXT_INPUTS][256]
Definition: ffv1.h:91
int context_count
Definition: ffv1.h:58
static int predict(int16_t *src, int16_t *last)
Definition: ffv1.h:134
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:87
int16_t quant_table[MAX_CONTEXT_INPUTS][256]
Definition: ffv1.h:90
int run_index
Definition: ffv1.h:95
Definition: ffv1.h:48
uint8_t state_transition[256]
Definition: ffv1.h:93
#define T(x)
Definition: vp56_arith.h:29
int num_h_slices
Definition: ffv1.h:114
#define MAX_QUANT_TABLES
Definition: ffv1.h:37
int colorspace
Definition: ffv1.h:96
DSPContext dsp
Definition: ffv1.h:109
static int get_context(PlaneContext *p, int16_t *src, int16_t *last, int16_t *last2)
Definition: ffv1.h:143
#define MAX_PLANES
Definition: ffv1.h:34
static void update_vlc_state(VlcState *const state, const int v)
Definition: ffv1.h:165
int slice_count
Definition: ffv1.h:112
#define FFABS(a)
Definition: common.h:52
int ac_byte_count
Definition: ffv1.h:88
int16_t drift
Definition: ffv1.h:49
#define L(x)
Definition: vp56_arith.h:36
int packed_at_lsb
Definition: ffv1.h:104
int context_count[MAX_QUANT_TABLES]
Definition: ffv1.h:92
Libavcodec external API header.
void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
Definition: ffv1.c:240
main external API structure.
Definition: avcodec.h:1054
int ffv1_common_init(AVCodecContext *avctx)
Definition: ffv1.c:134
int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
Definition: ffv1.c:156
Describe the class of an AVClass context structure.
Definition: log.h:33
int ffv1_init_slice_contexts(FFV1Context *f)
Definition: ffv1.c:190
#define mid_pred
Definition: mathops.h:94
int picture_number
Definition: ffv1.h:81
uint16_t error_sum
Definition: ffv1.h:50
int key_frame_ok
Definition: ffv1.h:101
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:35
int gob_count
Definition: ffv1.h:106
int quant_table_index
Definition: ffv1.h:57
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:59
DSP utils.
int chroma_h_shift
Definition: ffv1.h:78
PlaneContext plane[MAX_PLANES]
Definition: ffv1.h:89
int transparency
Definition: ffv1.h:79
int ffv1_allocate_initial_states(FFV1Context *f)
Definition: ffv1.c:225
int chroma_v_shift
Definition: ffv1.h:78
#define MAX_SLICES
Definition: ffv1.h:64
int chroma_planes
Definition: ffv1.h:77
struct FFV1Context * slice_context[MAX_SLICES]
Definition: ffv1.h:111
AVFrame * frame
Definition: ffv1.h:82
uint8_t interlace_bit_state[2]
Definition: ffv1.h:61
#define av_always_inline
Definition: attributes.h:40
int ec
Definition: ffv1.h:99
int num_v_slices
Definition: ffv1.h:113
AVCodecContext * avctx
Definition: ffv1.h:68
int slice_x
Definition: ffv1.h:117
AVFrame * last_picture
Definition: ffv1.h:83
int width
Definition: ffv1.h:76
DSPContext.
Definition: dsputil.h:124
bitstream writer API