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/*

 * FFV1 codec for libavcodec

 *

 * Copyright (c) 2003-2012 Michael Niedermayer 

 *

 * 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 "dsputil.h"

#include "get_bits.h"

#include "internal.h"

#include "mathops.h"

#include "put_bits.h"

#include "rangecoder.h"

#include "thread.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 micro_version;

    int width, height;

    int chroma_planes;

    int chroma_h_shift, chroma_v_shift;

    int transparency;

    int flags;

    int picture_number;

    ThreadFrame picture, last_picture;

    struct FFV1Context *fsrc;

    AVFrame *cur;

    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 ec;

    int intra;

    int slice_damaged;

    int key_frame_ok;

    int bits_per_raw_sample;

    int packed_at_lsb;

    int gob_count;

    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 slice_reset_contexts;

    int slice_coding_mode;

} 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 */