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 #define AC_GOLOMB_RICE 0
57 #define AC_RANGE_DEFAULT_TAB 1
58 #define AC_RANGE_CUSTOM_TAB 2
59 #define AC_RANGE_DEFAULT_TAB_FORCE -2
61 typedef struct VlcState {
68 typedef struct PlaneContext {
69 int16_t quant_table[MAX_CONTEXT_INPUTS][256];
70 int quant_table_index;
72 uint8_t (*state)[CONTEXT_SIZE];
74 uint8_t interlace_bit_state[2];
77 #define MAX_SLICES 256
79 typedef struct FFV1Context {
81 AVCodecContext *avctx;
85 uint64_t rc_stat[256][2];
86 uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2];
91 int chroma_h_shift, chroma_v_shift;
96 ThreadFrame picture, last_picture;
97 struct FFV1Context *fsrc;
101 int ac; ///< 1=range coder <-> 0=golomb rice
102 int ac_byte_count; ///< number of bytes used for AC coding
103 PlaneContext plane[MAX_PLANES];
104 int16_t quant_table[MAX_CONTEXT_INPUTS][256];
105 int16_t quant_tables[MAX_QUANT_TABLES][MAX_CONTEXT_INPUTS][256];
106 int context_count[MAX_QUANT_TABLES];
107 uint8_t state_transition[256];
108 uint8_t (*initial_states[MAX_QUANT_TABLES])[32];
111 int16_t *sample_buffer;
119 int bits_per_raw_sample;
123 int quant_table_count;
125 struct FFV1Context *slice_context[MAX_SLICES];
134 int slice_reset_contexts;
135 int slice_coding_mode;
136 int slice_rct_by_coef;
137 int slice_rct_ry_coef;
140 int ff_ffv1_common_init(AVCodecContext *avctx);
141 int ff_ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs);
142 int ff_ffv1_init_slices_state(FFV1Context *f);
143 int ff_ffv1_init_slice_contexts(FFV1Context *f);
144 int ff_ffv1_allocate_initial_states(FFV1Context *f);
145 void ff_ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs);
146 int ff_ffv1_close(AVCodecContext *avctx);
148 static av_always_inline int fold(int diff, int bits)
153 diff += 1 << (bits - 1);
154 diff = av_mod_uintp2(diff, bits);
155 diff -= 1 << (bits - 1);
161 static inline int predict(int16_t *src, int16_t *last)
163 const int LT = last[-1];
164 const int T = last[0];
165 const int L = src[-1];
167 return mid_pred(L, L + T - LT, T);
170 static inline int get_context(PlaneContext *p, int16_t *src,
171 int16_t *last, int16_t *last2)
173 const int LT = last[-1];
174 const int T = last[0];
175 const int RT = last[1];
176 const int L = src[-1];
178 if (p->quant_table[3][127]) {
179 const int TT = last2[0];
180 const int LL = src[-2];
181 return p->quant_table[0][(L - LT) & 0xFF] +
182 p->quant_table[1][(LT - T) & 0xFF] +
183 p->quant_table[2][(T - RT) & 0xFF] +
184 p->quant_table[3][(LL - L) & 0xFF] +
185 p->quant_table[4][(TT - T) & 0xFF];
187 return p->quant_table[0][(L - LT) & 0xFF] +
188 p->quant_table[1][(LT - T) & 0xFF] +
189 p->quant_table[2][(T - RT) & 0xFF];
192 static inline void update_vlc_state(VlcState *const state, const int v)
194 int drift = state->drift;
195 int count = state->count;
196 state->error_sum += FFABS(v);
199 if (count == 128) { // FIXME: variable
202 state->error_sum >>= 1;
206 if (drift <= -count) {
207 if (state->bias > -128)
213 } else if (drift > 0) {
214 if (state->bias < 127)
222 state->drift = drift;
223 state->count = count;
226 #endif /* AVCODEC_FFV1_H */