Libav
ffv1.h
Go to the documentation of this file.
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 #define AC_GOLOMB_RICE 0
40 #define AC_RANGE_DEFAULT_TAB 1
41 #define AC_RANGE_CUSTOM_TAB 2
42 
43 extern const uint8_t ff_log2_run[41];
44 
45 extern const int8_t ffv1_quant5_10bit[256];
46 extern const int8_t ffv1_quant5[256];
47 extern const int8_t ffv1_quant9_10bit[256];
48 extern const int8_t ffv1_quant11[256];
49 extern const uint8_t ffv1_ver2_state[256];
50 
51 typedef struct VlcState {
52  int16_t drift;
53  uint16_t error_sum;
54  int8_t bias;
56 } VlcState;
57 
58 typedef struct PlaneContext {
64  uint8_t interlace_bit_state[2];
65 } PlaneContext;
66 
67 #define MAX_SLICES 256
68 
69 typedef struct FFV1Context {
70  AVClass *class;
75  uint64_t rc_stat[256][2];
76  uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2];
77  int version;
79  int width, height;
81  int chroma_h_shift, chroma_v_shift;
83  int flags;
85  int key_frame;
86  const AVFrame *frame;
88 
91  int ac; // 1 = range coder <-> 0 = golomb rice
92  int ac_byte_count; // number of bytes used for AC coding
95  int16_t quant_tables[MAX_QUANT_TABLES][MAX_CONTEXT_INPUTS][256];
96  int context_count[MAX_QUANT_TABLES];
97  uint8_t state_transition[256];
98  uint8_t (*initial_states[MAX_QUANT_TABLES])[32];
99  int run_index;
101  int16_t *sample_buffer;
102 
103  int ec;
107 
110 
113 
120  int slice_x;
121  int slice_y;
122 } FFV1Context;
123 
124 static av_always_inline int fold(int diff, int bits)
125 {
126  if (bits == 8)
127  diff = (int8_t)diff;
128  else {
129  diff += 1 << (bits - 1);
130  diff &= (1 << bits) - 1;
131  diff -= 1 << (bits - 1);
132  }
133 
134  return diff;
135 }
136 
137 static inline int predict(int16_t *src, int16_t *last)
138 {
139  const int LT = last[-1];
140  const int T = last[0];
141  const int L = src[-1];
142 
143  return mid_pred(L, L + T - LT, T);
144 }
145 
146 static inline int get_context(PlaneContext *p, int16_t *src,
147  int16_t *last, int16_t *last2)
148 {
149  const int LT = last[-1];
150  const int T = last[0];
151  const int RT = last[1];
152  const int L = src[-1];
153 
154  if (p->quant_table[3][127]) {
155  const int TT = last2[0];
156  const int LL = src[-2];
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  p->quant_table[3][(LL - L) & 0xFF] +
161  p->quant_table[4][(TT - T) & 0xFF];
162  } else
163  return p->quant_table[0][(L - LT) & 0xFF] +
164  p->quant_table[1][(LT - T) & 0xFF] +
165  p->quant_table[2][(T - RT) & 0xFF];
166 }
167 
168 static inline void update_vlc_state(VlcState *const state, const int v)
169 {
170  int drift = state->drift;
171  int count = state->count;
172  state->error_sum += FFABS(v);
173  drift += v;
174 
175  if (count == 128) { // FIXME: variable
176  count >>= 1;
177  drift >>= 1;
178  state->error_sum >>= 1;
179  }
180  count++;
181 
182  if (drift <= -count) {
183  if (state->bias > -128)
184  state->bias--;
185 
186  drift += count;
187  if (drift <= -count)
188  drift = -count + 1;
189  } else if (drift > 0) {
190  if (state->bias < 127)
191  state->bias++;
192 
193  drift -= count;
194  if (drift > 0)
195  drift = 0;
196  }
197 
198  state->drift = drift;
199  state->count = count;
200 }
201 
207 int ffv1_close(AVCodecContext *avctx);
208 
209 #endif /* AVCODEC_FFV1_H */
static av_always_inline int fold(int diff, int bits)
Definition: ffv1.h:124
This structure describes decoded (raw) audio or video data.
Definition: frame.h:140
int flags
Definition: ffv1.h:83
int ffv1_close(AVCodecContext *avctx)
Definition: ffv1.c:275
int16_t quant_table[MAX_CONTEXT_INPUTS][256]
Definition: ffv1.h:59
int quant_table_count
Definition: ffv1.h:112
int slice_height
Definition: ffv1.h:119
#define MAX_CONTEXT_INPUTS
Definition: ffv1.h:37
int16_t * sample_buffer
Definition: ffv1.h:101
int version
Definition: ffv1.h:77
Range coder.
const int8_t ffv1_quant11[256]
Definition: ffv1.c:93
int plane_count
Definition: ffv1.h:90
int slice_damaged
Definition: ffv1.h:104
PutBitContext pb
Definition: ffv1.h:74
uint8_t bits
Definition: crc.c:252
uint8_t
int8_t bias
Definition: ffv1.h:54
RangeCoder c
Definition: ffv1.h:72
int slice_y
Definition: ffv1.h:121
uint8_t count
Definition: ffv1.h:55
bitstream reader API header.
VlcState * vlc_state
Definition: ffv1.h:63
int minor_version
Definition: ffv1.h:78
int bits_per_raw_sample
Definition: ffv1.h:108
int slice_width
Definition: ffv1.h:118
GetBitContext gb
Definition: ffv1.h:73
#define src
Definition: vp8dsp.c:254
AVFrame * cur
Definition: ffv1.h:89
int context_count
Definition: ffv1.h:61
static int predict(int16_t *src, int16_t *last)
Definition: ffv1.h:137
const uint8_t ff_log2_run[41]
Definition: bitstream.c:37
const int8_t ffv1_quant5_10bit[256]
Definition: ffv1.c:36
int ac
Definition: ffv1.h:91
int run_index
Definition: ffv1.h:99
Definition: ffv1.h:51
#define T(x)
Definition: vp56_arith.h:29
int key_frame
Definition: ffv1.h:85
const AVFrame * frame
Definition: ffv1.h:86
int num_h_slices
Definition: ffv1.h:117
#define MAX_QUANT_TABLES
Definition: ffv1.h:36
int colorspace
Definition: ffv1.h:100
static float quant_table[96]
Definition: binkaudio.c:42
static int get_context(PlaneContext *p, int16_t *src, int16_t *last, int16_t *last2)
Definition: ffv1.h:146
#define MAX_PLANES
Definition: ffv1.h:33
static void update_vlc_state(VlcState *const state, const int v)
Definition: ffv1.h:168
int slice_count
Definition: ffv1.h:115
#define FFABS(a)
Definition: common.h:61
int ac_byte_count
Definition: ffv1.h:92
int16_t drift
Definition: ffv1.h:52
#define L(x)
Definition: vp56_arith.h:36
int packed_at_lsb
Definition: ffv1.h:109
Libavcodec external API header.
void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
Definition: ffv1.c:248
main external API structure.
Definition: avcodec.h:1409
int ffv1_common_init(AVCodecContext *avctx)
Definition: ffv1.c:132
int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
Definition: ffv1.c:152
Describe the class of an AVClass context structure.
Definition: log.h:34
int ffv1_init_slice_contexts(FFV1Context *f)
Definition: ffv1.c:186
#define mid_pred
Definition: mathops.h:99
int picture_number
Definition: ffv1.h:84
uint16_t error_sum
Definition: ffv1.h:53
int key_frame_ok
Definition: ffv1.h:105
const uint8_t ffv1_ver2_state[256]
Definition: ffv1.c:112
#define CONTEXT_SIZE
Definition: ffv1.h:34
int gob_count
Definition: ffv1.h:111
int quant_table_index
Definition: ffv1.h:60
int height
Definition: gxfenc.c:72
const int8_t ffv1_quant5[256]
Definition: ffv1.c:55
static struct @174 state
int context_model
Definition: ffv1.h:106
const int8_t ffv1_quant9_10bit[256]
Definition: ffv1.c:74
int transparency
Definition: ffv1.h:82
int ffv1_allocate_initial_states(FFV1Context *f)
Definition: ffv1.c:233
int chroma_v_shift
Definition: ffv1.h:81
#define MAX_SLICES
Definition: ffv1.h:67
int chroma_planes
Definition: ffv1.h:80
struct FFV1Context * slice_context[MAX_SLICES]
Definition: ffv1.h:114
#define av_always_inline
Definition: attributes.h:40
int ec
Definition: ffv1.h:103
int num_v_slices
Definition: ffv1.h:116
AVCodecContext * avctx
Definition: ffv1.h:71
int slice_x
Definition: ffv1.h:120
AVFrame * last_picture
Definition: ffv1.h:87
int width
Definition: ffv1.h:79
bitstream writer API