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
28 #define CONTEXT_SIZE 32
30 #define MAX_QUANT_TABLES 8
31 #define MAX_CONTEXT_INPUTS 5
33 extern const uint8_t ff_log2_run[41];
35 extern const int8_t ffv1_quant5_10bit[256];
36 extern const int8_t ffv1_quant5[256];
37 extern const int8_t ffv1_quant9_10bit[256];
38 extern const int8_t ffv1_quant11[256];
39 extern const uint8_t ffv1_ver2_state[256];
41 typedef struct VlcState {
48 typedef struct PlaneContext {
49 int16_t quant_table[MAX_CONTEXT_INPUTS][256];
50 int quant_table_index;
52 uint8_t (*state)[CONTEXT_SIZE];
54 uint8_t interlace_bit_state[2];
57 #define MAX_SLICES 256
59 typedef struct FFV1Context {
61 AVCodecContext *avctx;
65 uint64_t rc_stat[256][2];
66 uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2];
71 int chroma_h_shift, chroma_v_shift;
75 AVFrame picture, last_picture;
77 int ac; // 1 = range coder <-> 0 = golomb rice
78 int ac_byte_count; // number of bytes used for AC coding
79 PlaneContext plane[MAX_PLANES];
80 int16_t quant_table[MAX_CONTEXT_INPUTS][256];
81 int16_t quant_tables[MAX_QUANT_TABLES][MAX_CONTEXT_INPUTS][256];
82 int context_count[MAX_QUANT_TABLES];
83 uint8_t state_transition[256];
84 uint8_t (*initial_states[MAX_QUANT_TABLES])[32];
87 int16_t *sample_buffer;
93 int bits_per_raw_sample;
97 int quant_table_count;
101 struct FFV1Context *slice_context[MAX_SLICES];
111 static av_always_inline int fold(int diff, int bits)
116 diff += 1 << (bits - 1);
117 diff &= (1 << bits) - 1;
118 diff -= 1 << (bits - 1);
124 static inline int predict(int16_t *src, int16_t *last)
126 const int LT = last[-1];
127 const int T = last[0];
128 const int L = src[-1];
130 return mid_pred(L, L + T - LT, T);
133 static inline int get_context(PlaneContext *p, int16_t *src,
134 int16_t *last, int16_t *last2)
136 const int LT = last[-1];
137 const int T = last[0];
138 const int RT = last[1];
139 const int L = src[-1];
141 if (p->quant_table[3][127]) {
142 const int TT = last2[0];
143 const int LL = src[-2];
144 return p->quant_table[0][(L - LT) & 0xFF] +
145 p->quant_table[1][(LT - T) & 0xFF] +
146 p->quant_table[2][(T - RT) & 0xFF] +
147 p->quant_table[3][(LL - L) & 0xFF] +
148 p->quant_table[4][(TT - T) & 0xFF];
150 return p->quant_table[0][(L - LT) & 0xFF] +
151 p->quant_table[1][(LT - T) & 0xFF] +
152 p->quant_table[2][(T - RT) & 0xFF];
155 static inline void update_vlc_state(VlcState *const state, const int v)
157 int drift = state->drift;
158 int count = state->count;
159 state->error_sum += FFABS(v);
162 if (count == 128) { // FIXME: variable
165 state->error_sum >>= 1;
169 if (drift <= -count) {
170 if (state->bias > -128)
176 } else if (drift > 0) {
177 if (state->bias < 127)
185 state->drift = drift;
186 state->count = count;
189 int ffv1_common_init(AVCodecContext *avctx);
190 int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs);
191 int ffv1_init_slice_contexts(FFV1Context *f);
192 int ffv1_allocate_initial_states(FFV1Context *f);
193 void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs);
194 int ffv1_close(AVCodecContext *avctx);
196 #endif /* AVCODEC_FFV1_H */