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/*
* FFV1 codec for libavcodec
*
* Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_FFV1_H
#define AVCODEC_FFV1_H
/**
* @file
* FF Video Codec 1 (a lossless codec)
*/
#include "libavutil/avassert.h"
#include "libavutil/crc.h"
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/timer.h"
#include "avcodec.h"
#include "internal.h"
#include "dsputil.h"
#include "rangecoder.h"
#include "golomb.h"
#include "mathops.h"
#ifdef __INTEL_COMPILER
#undef av_flatten
#define av_flatten
#endif
#define MAX_PLANES 4
#define CONTEXT_SIZE 32
#define MAX_QUANT_TABLES 8
#define MAX_CONTEXT_INPUTS 5
extern const uint8_t ff_log2_run[41];
typedef struct VlcState {
int16_t drift;
uint16_t error_sum;
int8_t bias;
uint8_t count;
} VlcState;
typedef struct PlaneContext {
int16_t quant_table[MAX_CONTEXT_INPUTS][256];
int quant_table_index;
int context_count;
uint8_t (*state)[CONTEXT_SIZE];
VlcState *vlc_state;
uint8_t interlace_bit_state[2];
} PlaneContext;
#define MAX_SLICES 256
typedef struct FFV1Context {
AVClass *class;
AVCodecContext *avctx;
RangeCoder c;
GetBitContext gb;
PutBitContext pb;
uint64_t rc_stat[256][2];
uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2];
int version;
int minor_version;
int width, height;
int chroma_h_shift, chroma_v_shift;
int chroma_planes;
int transparency;
int flags;
int picture_number;
AVFrame picture;
AVFrame last_picture;
int plane_count;
int ac; ///< 1=range coder <-> 0=golomb rice
int ac_byte_count; ///< number of bytes used for AC coding
PlaneContext plane[MAX_PLANES];
int16_t quant_table[MAX_CONTEXT_INPUTS][256];
int16_t quant_tables[MAX_QUANT_TABLES][MAX_CONTEXT_INPUTS][256];
int context_count[MAX_QUANT_TABLES];
uint8_t state_transition[256];
uint8_t (*initial_states[MAX_QUANT_TABLES])[32];
int run_index;
int colorspace;
int16_t *sample_buffer;
int gob_count;
int packed_at_lsb;
int ec;
int slice_damaged;
int key_frame_ok;
int quant_table_count;
DSPContext dsp;
struct FFV1Context *slice_context[MAX_SLICES];
int slice_count;
int num_v_slices;
int num_h_slices;
int slice_width;
int slice_height;
int slice_x;
int slice_y;
int bits_per_raw_sample;
} FFV1Context;
int ffv1_common_init(AVCodecContext *avctx);
int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs);
int ffv1_init_slices_state(FFV1Context *f);
int ffv1_init_slice_contexts(FFV1Context *f);
int ffv1_allocate_initial_states(FFV1Context *f);
void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs);
int ffv1_close(AVCodecContext *avctx);
static av_always_inline int fold(int diff, int bits)
{
if (bits == 8)
diff = (int8_t)diff;
else {
diff += 1 << (bits - 1);
diff &= (1 << bits) - 1;
diff -= 1 << (bits - 1);
}
return diff;
}
static inline int predict(int16_t *src, int16_t *last)
{
const int LT = last[-1];
const int T = last[0];
const int L = src[-1];
return mid_pred(L, L + T - LT, T);
}
static inline int get_context(PlaneContext *p, int16_t *src,
int16_t *last, int16_t *last2)
{
const int LT = last[-1];
const int T = last[0];
const int RT = last[1];
const int L = src[-1];
if (p->quant_table[3][127]) {
const int TT = last2[0];
const int LL = src[-2];
return p->quant_table[0][(L - LT) & 0xFF] +
p->quant_table[1][(LT - T) & 0xFF] +
p->quant_table[2][(T - RT) & 0xFF] +
p->quant_table[3][(LL - L) & 0xFF] +
p->quant_table[4][(TT - T) & 0xFF];
} else
return p->quant_table[0][(L - LT) & 0xFF] +
p->quant_table[1][(LT - T) & 0xFF] +
p->quant_table[2][(T - RT) & 0xFF];
}
static inline void update_vlc_state(VlcState *const state, const int v)
{
int drift = state->drift;
int count = state->count;
state->error_sum += FFABS(v);
drift += v;
if (count == 128) { // FIXME: variable
count >>= 1;
drift >>= 1;
state->error_sum >>= 1;
}
count++;
if (drift <= -count) {
if (state->bias > -128)
state->bias--;
drift += count;
if (drift <= -count)
drift = -count + 1;
} else if (drift > 0) {
if (state->bias < 127)
state->bias++;
drift -= count;
if (drift > 0)
drift = 0;
}
state->drift = drift;
state->count = count;
}
#endif /* AVCODEC_FFV1_H */
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