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ffmpeg / libavcodec / jpeglsenc.c @ 72415b2a

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/*
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 * JPEG-LS encoder
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 * Copyright (c) 2003 Michael Niedermayer
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 * Copyright (c) 2006 Konstantin Shishkov
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file libavcodec/jpeglsenc.c
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 * JPEG-LS encoder.
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 */
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#include "avcodec.h"
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#include "get_bits.h"
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#include "golomb.h"
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#include "mathops.h"
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#include "dsputil.h"
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#include "mjpeg.h"
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#include "jpegls.h"
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/**
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 * Encode error from regular symbol
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 */
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static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q, int err){
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    int k;
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    int val;
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    int map;
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    for(k = 0; (state->N[Q] << k) < state->A[Q]; k++);
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    map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
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    if(err < 0)
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        err += state->range;
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    if(err >= ((state->range + 1) >> 1)) {
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        err -= state->range;
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        val = 2 * FFABS(err) - 1 - map;
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    } else
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        val = 2 * err + map;
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    set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
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    ff_jpegls_update_state_regular(state, Q, err);
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}
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/**
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 * Encode error from run termination
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 */
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static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb, int RItype, int err, int limit_add){
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    int k;
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    int val, map;
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    int Q = 365 + RItype;
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    int temp;
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    temp = state->A[Q];
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    if(RItype)
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        temp += state->N[Q] >> 1;
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    for(k = 0; (state->N[Q] << k) < temp; k++);
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    map = 0;
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    if(!k && err && (2 * state->B[Q] < state->N[Q]))
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        map = 1;
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    if(err < 0)
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        val = - (2 * err) - 1 - RItype + map;
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    else
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        val = 2 * err - RItype - map;
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    set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
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    if(err < 0)
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        state->B[Q]++;
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    state->A[Q] += (val + 1 - RItype) >> 1;
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    ff_jpegls_downscale_state(state, Q);
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}
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/**
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 * Encode run value as specified by JPEG-LS standard
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 */
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static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run, int comp, int trail){
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    while(run >= (1 << ff_log2_run[state->run_index[comp]])){
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        put_bits(pb, 1, 1);
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        run -= 1 << ff_log2_run[state->run_index[comp]];
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        if(state->run_index[comp] < 31)
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            state->run_index[comp]++;
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    }
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    /* if hit EOL, encode another full run, else encode aborted run */
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    if(!trail && run) {
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        put_bits(pb, 1, 1);
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    }else if(trail){
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        put_bits(pb, 1, 0);
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        if(ff_log2_run[state->run_index[comp]])
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            put_bits(pb, ff_log2_run[state->run_index[comp]], run);
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    }
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}
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/**
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 * Encode one line of image
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 */
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static inline void ls_encode_line(JLSState *state, PutBitContext *pb, void *last, void *cur, int last2, int w, int stride, int comp, int bits){
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    int x = 0;
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    int Ra, Rb, Rc, Rd;
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    int D0, D1, D2;
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    while(x < w) {
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        int err, pred, sign;
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        /* compute gradients */
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        Ra = x ? R(cur, x - stride) : R(last, x);
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        Rb = R(last, x);
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        Rc = x ? R(last, x - stride) : last2;
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        Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
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        D0 = Rd - Rb;
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        D1 = Rb - Rc;
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        D2 = Rc - Ra;
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        /* run mode */
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        if((FFABS(D0) <= state->near) && (FFABS(D1) <= state->near) && (FFABS(D2) <= state->near)) {
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            int RUNval, RItype, run;
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            run = 0;
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            RUNval = Ra;
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            while(x < w && (FFABS(R(cur, x) - RUNval) <= state->near)){
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                run++;
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                W(cur, x, Ra);
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                x += stride;
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            }
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            ls_encode_run(state, pb, run, comp, x < w);
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            if(x >= w)
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                return;
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            Rb = R(last, x);
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            RItype = (FFABS(Ra - Rb) <= state->near);
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            pred = RItype ? Ra : Rb;
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            err = R(cur, x) - pred;
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            if(!RItype && Ra > Rb)
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                err = -err;
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            if(state->near){
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                if(err > 0)
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                    err = (state->near + err) / state->twonear;
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                else
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                    err = -(state->near - err) / state->twonear;
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                if(RItype || (Rb >= Ra))
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                    Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
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                else
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                    Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
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                W(cur, x, Ra);
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            }
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            if(err < 0)
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                err += state->range;
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            if(err >= ((state->range + 1) >> 1))
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                err -= state->range;
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            ls_encode_runterm(state, pb, RItype, err, ff_log2_run[state->run_index[comp]]);
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            if(state->run_index[comp] > 0)
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                state->run_index[comp]--;
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        } else { /* regular mode */
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            int context;
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            context = ff_jpegls_quantize(state, D0) * 81 + ff_jpegls_quantize(state, D1) * 9 + ff_jpegls_quantize(state, D2);
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            pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
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            if(context < 0){
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                context = -context;
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                sign = 1;
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                pred = av_clip(pred - state->C[context], 0, state->maxval);
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                err = pred - R(cur, x);
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            }else{
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                sign = 0;
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                pred = av_clip(pred + state->C[context], 0, state->maxval);
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                err = R(cur, x) - pred;
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            }
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            if(state->near){
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                if(err > 0)
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                    err = (state->near + err) / state->twonear;
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                else
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                    err = -(state->near - err) / state->twonear;
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                if(!sign)
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                    Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
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                else
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                    Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
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                W(cur, x, Ra);
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            }
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            ls_encode_regular(state, pb, context, err);
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        }
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        x += stride;
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    }
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}
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static void ls_store_lse(JLSState *state, PutBitContext *pb){
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    /* Test if we have default params and don't need to store LSE */
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    JLSState state2;
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    memset(&state2, 0, sizeof(JLSState));
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    state2.bpp = state->bpp;
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    state2.near = state->near;
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    ff_jpegls_reset_coding_parameters(&state2, 1);
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    if(state->T1 == state2.T1 && state->T2 == state2.T2 && state->T3 == state2.T3 && state->reset == state2.reset)
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        return;
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    /* store LSE type 1 */
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    put_marker(pb, LSE);
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    put_bits(pb, 16, 13);
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    put_bits(pb, 8,   1);
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    put_bits(pb, 16, state->maxval);
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    put_bits(pb, 16, state->T1);
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    put_bits(pb, 16, state->T2);
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    put_bits(pb, 16, state->T3);
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    put_bits(pb, 16, state->reset);
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}
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static int encode_picture_ls(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
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    JpeglsContext * const s = avctx->priv_data;
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    AVFrame *pict = data;
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    AVFrame * const p= (AVFrame*)&s->picture;
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    const int near = avctx->prediction_method;
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    PutBitContext pb, pb2;
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    GetBitContext gb;
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    uint8_t *buf2, *zero, *cur, *last;
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    JLSState *state;
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    int i, size;
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    int comps;
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    buf2 = av_malloc(buf_size);
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    init_put_bits(&pb, buf, buf_size);
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    init_put_bits(&pb2, buf2, buf_size);
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    *p = *pict;
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    p->pict_type= FF_I_TYPE;
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    p->key_frame= 1;
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    if(avctx->pix_fmt == PIX_FMT_GRAY8 || avctx->pix_fmt == PIX_FMT_GRAY16)
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        comps = 1;
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    else
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        comps = 3;
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    /* write our own JPEG header, can't use mjpeg_picture_header */
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    put_marker(&pb, SOI);
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    put_marker(&pb, SOF48);
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    put_bits(&pb, 16, 8 + comps * 3); // header size depends on components
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    put_bits(&pb,  8, (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 8); // bpp
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    put_bits(&pb, 16, avctx->height);
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    put_bits(&pb, 16, avctx->width);
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    put_bits(&pb,  8, comps);         // components
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    for(i = 1; i <= comps; i++) {
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        put_bits(&pb,  8, i);    // component ID
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        put_bits(&pb,  8, 0x11); // subsampling: none
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        put_bits(&pb,  8, 0);    // Tiq, used by JPEG-LS ext
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    }
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    put_marker(&pb, SOS);
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    put_bits(&pb, 16, 6 + comps * 2);
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    put_bits(&pb,  8, comps);
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    for(i = 1; i <= comps; i++) {
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        put_bits(&pb,  8, i);  // component ID
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        put_bits(&pb,  8, 0);  // mapping index: none
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    }
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    put_bits(&pb,  8, near);
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    put_bits(&pb,  8, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
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    put_bits(&pb,  8, 0); // point transform: none
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    state = av_mallocz(sizeof(JLSState));
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    /* initialize JPEG-LS state from JPEG parameters */
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    state->near = near;
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    state->bpp = (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 8;
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    ff_jpegls_reset_coding_parameters(state, 0);
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    ff_jpegls_init_state(state);
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    ls_store_lse(state, &pb);
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    zero = av_mallocz(p->linesize[0]);
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    last = zero;
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    cur = p->data[0];
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    if(avctx->pix_fmt == PIX_FMT_GRAY8){
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        int t = 0;
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        for(i = 0; i < avctx->height; i++) {
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            ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0,  8);
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            t = last[0];
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            last = cur;
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            cur += p->linesize[0];
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        }
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    }else if(avctx->pix_fmt == PIX_FMT_GRAY16){
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        int t = 0;
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        for(i = 0; i < avctx->height; i++) {
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            ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
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            t = *((uint16_t*)last);
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            last = cur;
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            cur += p->linesize[0];
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        }
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    }else if(avctx->pix_fmt == PIX_FMT_RGB24){
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        int j, width;
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        int Rc[3] = {0, 0, 0};
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        width = avctx->width * 3;
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        for(i = 0; i < avctx->height; i++) {
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            for(j = 0; j < 3; j++) {
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                ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
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                Rc[j] = last[j];
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            }
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            last = cur;
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            cur += s->picture.linesize[0];
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        }
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    }else if(avctx->pix_fmt == PIX_FMT_BGR24){
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        int j, width;
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        int Rc[3] = {0, 0, 0};
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        width = avctx->width * 3;
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        for(i = 0; i < avctx->height; i++) {
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            for(j = 2; j >= 0; j--) {
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                ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
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                Rc[j] = last[j];
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            }
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            last = cur;
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            cur += s->picture.linesize[0];
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        }
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    }
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    av_free(zero);
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    av_free(state);
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    // the specification says that after doing 0xff escaping unused bits in the
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    // last byte must be set to 0, so just append 7 "optional" zero-bits to
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    // avoid special-casing.
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    put_bits(&pb2, 7, 0);
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    size = put_bits_count(&pb2);
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    flush_put_bits(&pb2);
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    /* do escape coding */
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    init_get_bits(&gb, buf2, size);
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    size -= 7;
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    while(get_bits_count(&gb) < size){
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        int v;
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        v = get_bits(&gb, 8);
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        put_bits(&pb, 8, v);
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        if(v == 0xFF){
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            v = get_bits(&gb, 7);
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            put_bits(&pb, 8, v);
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        }
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    }
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    align_put_bits(&pb);
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    av_free(buf2);
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    /* End of image */
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    put_marker(&pb, EOI);
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    flush_put_bits(&pb);
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    emms_c();
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    return put_bits_count(&pb) >> 3;
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}
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static av_cold int encode_init_ls(AVCodecContext *ctx) {
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    JpeglsContext *c = (JpeglsContext*)ctx->priv_data;
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    c->avctx = ctx;
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    ctx->coded_frame = &c->picture;
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    if(ctx->pix_fmt != PIX_FMT_GRAY8 && ctx->pix_fmt != PIX_FMT_GRAY16 && ctx->pix_fmt != PIX_FMT_RGB24 && ctx->pix_fmt != PIX_FMT_BGR24){
379
        av_log(ctx, AV_LOG_ERROR, "Only grayscale and RGB24/BGR24 images are supported\n");
380
        return -1;
381
    }
382
    return 0;
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}
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AVCodec jpegls_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
386
    "jpegls",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_JPEGLS,
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    sizeof(JpeglsContext),
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    encode_init_ls,
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    encode_picture_ls,
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    NULL,
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    .pix_fmts= (const enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_RGB24, PIX_FMT_GRAY8, PIX_FMT_GRAY16, PIX_FMT_NONE},
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    .long_name= NULL_IF_CONFIG_SMALL("JPEG-LS"),
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};