2 * FFV1 codec for libavcodec
4 * Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of Libav.
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.
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.
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
23 #ifndef AVCODEC_FFV1_H
24 #define AVCODEC_FFV1_H
31 #include "rangecoder.h"
34 #define CONTEXT_SIZE 32
36 #define MAX_QUANT_TABLES 8
37 #define MAX_CONTEXT_INPUTS 5
39 extern const uint8_t ff_log2_run[41];
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];
47 typedef struct VlcState {
54 typedef struct PlaneContext {
55 int16_t quant_table[MAX_CONTEXT_INPUTS][256];
56 int quant_table_index;
58 uint8_t (*state)[CONTEXT_SIZE];
60 uint8_t interlace_bit_state[2];
63 #define MAX_SLICES 256
65 typedef struct FFV1Context {
67 AVCodecContext *avctx;
71 uint64_t rc_stat[256][2];
72 uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2];
77 int chroma_h_shift, chroma_v_shift;
83 AVFrame *last_picture;
87 int ac; // 1 = range coder <-> 0 = golomb rice
88 int ac_byte_count; // number of bytes used for AC coding
89 PlaneContext plane[MAX_PLANES];
90 int16_t quant_table[MAX_CONTEXT_INPUTS][256];
91 int16_t quant_tables[MAX_QUANT_TABLES][MAX_CONTEXT_INPUTS][256];
92 int context_count[MAX_QUANT_TABLES];
93 uint8_t state_transition[256];
94 uint8_t (*initial_states[MAX_QUANT_TABLES])[32];
97 int16_t *sample_buffer;
103 int bits_per_raw_sample;
107 int quant_table_count;
109 struct FFV1Context *slice_context[MAX_SLICES];
119 static av_always_inline int fold(int diff, int bits)
124 diff += 1 << (bits - 1);
125 diff &= (1 << bits) - 1;
126 diff -= 1 << (bits - 1);
132 static inline int predict(int16_t *src, int16_t *last)
134 const int LT = last[-1];
135 const int T = last[0];
136 const int L = src[-1];
138 return mid_pred(L, L + T - LT, T);
141 static inline int get_context(PlaneContext *p, int16_t *src,
142 int16_t *last, int16_t *last2)
144 const int LT = last[-1];
145 const int T = last[0];
146 const int RT = last[1];
147 const int L = src[-1];
149 if (p->quant_table[3][127]) {
150 const int TT = last2[0];
151 const int LL = src[-2];
152 return p->quant_table[0][(L - LT) & 0xFF] +
153 p->quant_table[1][(LT - T) & 0xFF] +
154 p->quant_table[2][(T - RT) & 0xFF] +
155 p->quant_table[3][(LL - L) & 0xFF] +
156 p->quant_table[4][(TT - T) & 0xFF];
158 return p->quant_table[0][(L - LT) & 0xFF] +
159 p->quant_table[1][(LT - T) & 0xFF] +
160 p->quant_table[2][(T - RT) & 0xFF];
163 static inline void update_vlc_state(VlcState *const state, const int v)
165 int drift = state->drift;
166 int count = state->count;
167 state->error_sum += FFABS(v);
170 if (count == 128) { // FIXME: variable
173 state->error_sum >>= 1;
177 if (drift <= -count) {
178 if (state->bias > -128)
184 } else if (drift > 0) {
185 if (state->bias < 127)
193 state->drift = drift;
194 state->count = count;
197 int ffv1_common_init(AVCodecContext *avctx);
198 int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs);
199 int ffv1_init_slice_contexts(FFV1Context *f);
200 int ffv1_allocate_initial_states(FFV1Context *f);
201 void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs);
202 int ffv1_close(AVCodecContext *avctx);
204 #endif /* AVCODEC_FFV1_H */