2 * FFV1 codec for libavcodec
4 * Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
8 * FFmpeg 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.
13 * FFmpeg 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.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #ifndef AVCODEC_FFV1_H
24 #define AVCODEC_FFV1_H
28 * FF Video Codec 1 (a lossless codec)
31 #include "libavutil/avassert.h"
32 #include "libavutil/crc.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/imgutils.h"
35 #include "libavutil/pixdesc.h"
36 #include "libavutil/timer.h"
42 #include "rangecoder.h"
45 #ifdef __INTEL_COMPILER
51 #define CONTEXT_SIZE 32
53 #define MAX_QUANT_TABLES 8
54 #define MAX_CONTEXT_INPUTS 5
56 typedef struct VlcState
{
63 typedef struct PlaneContext
{
64 int16_t quant_table
[MAX_CONTEXT_INPUTS
][256];
65 int quant_table_index
;
67 uint8_t (*state
)[CONTEXT_SIZE
];
69 uint8_t interlace_bit_state
[2];
72 #define MAX_SLICES 256
74 typedef struct FFV1Context
{
76 AVCodecContext
*avctx
;
80 uint64_t rc_stat
[256][2];
81 uint64_t (*rc_stat2
[MAX_QUANT_TABLES
])[32][2];
86 int chroma_h_shift
, chroma_v_shift
;
90 ThreadFrame picture
, last_picture
;
91 struct FFV1Context
*fsrc
;
95 int ac
; ///< 1=range coder <-> 0=golomb rice
96 int ac_byte_count
; ///< number of bytes used for AC coding
97 PlaneContext plane
[MAX_PLANES
];
98 int16_t quant_table
[MAX_CONTEXT_INPUTS
][256];
99 int16_t quant_tables
[MAX_QUANT_TABLES
][MAX_CONTEXT_INPUTS
][256];
100 int context_count
[MAX_QUANT_TABLES
];
101 uint8_t state_transition
[256];
102 uint8_t (*initial_states
[MAX_QUANT_TABLES
])[32];
105 int16_t *sample_buffer
;
112 int bits_per_raw_sample
;
116 int quant_table_count
;
118 struct FFV1Context
*slice_context
[MAX_SLICES
];
126 int slice_reset_contexts
;
127 int slice_coding_mode
;
128 int slice_rct_by_coef
;
129 int slice_rct_ry_coef
;
132 int ffv1_common_init(AVCodecContext
*avctx
);
133 int ffv1_init_slice_state(FFV1Context
*f
, FFV1Context
*fs
);
134 int ffv1_init_slices_state(FFV1Context
*f
);
135 int ffv1_init_slice_contexts(FFV1Context
*f
);
136 int ffv1_allocate_initial_states(FFV1Context
*f
);
137 void ffv1_clear_slice_state(FFV1Context
*f
, FFV1Context
*fs
);
138 int ffv1_close(AVCodecContext
*avctx
);
140 static av_always_inline
int fold(int diff
, int bits
)
145 diff
+= 1 << (bits
- 1);
146 diff
&= (1 << bits
) - 1;
147 diff
-= 1 << (bits
- 1);
153 static inline int predict(int16_t *src
, int16_t *last
)
155 const int LT
= last
[-1];
156 const int T
= last
[0];
157 const int L
= src
[-1];
159 return mid_pred(L
, L
+ T
- LT
, T
);
162 static inline int get_context(PlaneContext
*p
, int16_t *src
,
163 int16_t *last
, int16_t *last2
)
165 const int LT
= last
[-1];
166 const int T
= last
[0];
167 const int RT
= last
[1];
168 const int L
= src
[-1];
170 if (p
->quant_table
[3][127]) {
171 const int TT
= last2
[0];
172 const int LL
= src
[-2];
173 return p
->quant_table
[0][(L
- LT
) & 0xFF] +
174 p
->quant_table
[1][(LT
- T
) & 0xFF] +
175 p
->quant_table
[2][(T
- RT
) & 0xFF] +
176 p
->quant_table
[3][(LL
- L
) & 0xFF] +
177 p
->quant_table
[4][(TT
- T
) & 0xFF];
179 return p
->quant_table
[0][(L
- LT
) & 0xFF] +
180 p
->quant_table
[1][(LT
- T
) & 0xFF] +
181 p
->quant_table
[2][(T
- RT
) & 0xFF];
184 static inline void update_vlc_state(VlcState
*const state
, const int v
)
186 int drift
= state
->drift
;
187 int count
= state
->count
;
188 state
->error_sum
+= FFABS(v
);
191 if (count
== 128) { // FIXME: variable
194 state
->error_sum
>>= 1;
198 if (drift
<= -count
) {
199 if (state
->bias
> -128)
205 } else if (drift
> 0) {
206 if (state
->bias
< 127)
214 state
->drift
= drift
;
215 state
->count
= count
;
218 #endif /* AVCODEC_FFV1_H */