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"
43 #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 extern const uint8_t ff_log2_run[41];
58 typedef struct VlcState {
65 typedef struct PlaneContext {
66 int16_t quant_table[MAX_CONTEXT_INPUTS][256];
67 int quant_table_index;
69 uint8_t (*state)[CONTEXT_SIZE];
71 uint8_t interlace_bit_state[2];
74 #define MAX_SLICES 256
76 typedef struct FFV1Context {
78 AVCodecContext *avctx;
82 uint64_t rc_stat[256][2];
83 uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2];
88 int chroma_h_shift, chroma_v_shift;
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;
111 int bits_per_raw_sample;
115 int quant_table_count;
119 struct FFV1Context *slice_context[MAX_SLICES];
129 int ffv1_common_init(AVCodecContext *avctx);
130 int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs);
131 int ffv1_init_slices_state(FFV1Context *f);
132 int ffv1_init_slice_contexts(FFV1Context *f);
133 int ffv1_allocate_initial_states(FFV1Context *f);
134 void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs);
135 int ffv1_close(AVCodecContext *avctx);
137 static av_always_inline int fold(int diff, int bits)
142 diff += 1 << (bits - 1);
143 diff &= (1 << bits) - 1;
144 diff -= 1 << (bits - 1);
150 static inline int predict(int16_t *src, int16_t *last)
152 const int LT = last[-1];
153 const int T = last[0];
154 const int L = src[-1];
156 return mid_pred(L, L + T - LT, T);
159 static inline int get_context(PlaneContext *p, int16_t *src,
160 int16_t *last, int16_t *last2)
162 const int LT = last[-1];
163 const int T = last[0];
164 const int RT = last[1];
165 const int L = src[-1];
167 if (p->quant_table[3][127]) {
168 const int TT = last2[0];
169 const int LL = src[-2];
170 return p->quant_table[0][(L - LT) & 0xFF] +
171 p->quant_table[1][(LT - T) & 0xFF] +
172 p->quant_table[2][(T - RT) & 0xFF] +
173 p->quant_table[3][(LL - L) & 0xFF] +
174 p->quant_table[4][(TT - T) & 0xFF];
176 return p->quant_table[0][(L - LT) & 0xFF] +
177 p->quant_table[1][(LT - T) & 0xFF] +
178 p->quant_table[2][(T - RT) & 0xFF];
181 static inline void update_vlc_state(VlcState *const state, const int v)
183 int drift = state->drift;
184 int count = state->count;
185 state->error_sum += FFABS(v);
188 if (count == 128) { // FIXME: variable
191 state->error_sum >>= 1;
195 if (drift <= -count) {
196 if (state->bias > -128)
202 } else if (drift > 0) {
203 if (state->bias < 127)
211 state->drift = drift;
212 state->count = count;
215 #endif /* AVCODEC_FFV1_H */