jpeglsenc.c 12 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
/*
 * JPEG-LS encoder
 * Copyright (c) 2003 Michael Niedermayer
 * Copyright (c) 2006 Konstantin Shishkov
 *
 * 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
 */

/**
24
 * @file
25 26 27 28
 * JPEG-LS encoder.
 */

#include "avcodec.h"
29
#include "get_bits.h"
30
#include "golomb.h"
31
#include "mathops.h"
32
#include "dsputil.h"
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247
#include "mjpeg.h"
#include "jpegls.h"


/**
 * Encode error from regular symbol
 */
static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q, int err){
    int k;
    int val;
    int map;

    for(k = 0; (state->N[Q] << k) < state->A[Q]; k++);

    map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);

    if(err < 0)
        err += state->range;
    if(err >= ((state->range + 1) >> 1)) {
        err -= state->range;
        val = 2 * FFABS(err) - 1 - map;
    } else
        val = 2 * err + map;

    set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);

    ff_jpegls_update_state_regular(state, Q, err);
}

/**
 * Encode error from run termination
 */
static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb, int RItype, int err, int limit_add){
    int k;
    int val, map;
    int Q = 365 + RItype;
    int temp;

    temp = state->A[Q];
    if(RItype)
        temp += state->N[Q] >> 1;
    for(k = 0; (state->N[Q] << k) < temp; k++);
    map = 0;
    if(!k && err && (2 * state->B[Q] < state->N[Q]))
        map = 1;

    if(err < 0)
        val = - (2 * err) - 1 - RItype + map;
    else
        val = 2 * err - RItype - map;
    set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);

    if(err < 0)
        state->B[Q]++;
    state->A[Q] += (val + 1 - RItype) >> 1;

    ff_jpegls_downscale_state(state, Q);
}

/**
 * Encode run value as specified by JPEG-LS standard
 */
static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run, int comp, int trail){
    while(run >= (1 << ff_log2_run[state->run_index[comp]])){
        put_bits(pb, 1, 1);
        run -= 1 << ff_log2_run[state->run_index[comp]];
        if(state->run_index[comp] < 31)
            state->run_index[comp]++;
    }
    /* if hit EOL, encode another full run, else encode aborted run */
    if(!trail && run) {
        put_bits(pb, 1, 1);
    }else if(trail){
        put_bits(pb, 1, 0);
        if(ff_log2_run[state->run_index[comp]])
            put_bits(pb, ff_log2_run[state->run_index[comp]], run);
    }
}

/**
 * Encode one line of image
 */
static inline void ls_encode_line(JLSState *state, PutBitContext *pb, void *last, void *cur, int last2, int w, int stride, int comp, int bits){
    int x = 0;
    int Ra, Rb, Rc, Rd;
    int D0, D1, D2;

    while(x < w) {
        int err, pred, sign;

        /* compute gradients */
        Ra = x ? R(cur, x - stride) : R(last, x);
        Rb = R(last, x);
        Rc = x ? R(last, x - stride) : last2;
        Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
        D0 = Rd - Rb;
        D1 = Rb - Rc;
        D2 = Rc - Ra;

        /* run mode */
        if((FFABS(D0) <= state->near) && (FFABS(D1) <= state->near) && (FFABS(D2) <= state->near)) {
            int RUNval, RItype, run;

            run = 0;
            RUNval = Ra;
            while(x < w && (FFABS(R(cur, x) - RUNval) <= state->near)){
                run++;
                W(cur, x, Ra);
                x += stride;
            }
            ls_encode_run(state, pb, run, comp, x < w);
            if(x >= w)
                return;
            Rb = R(last, x);
            RItype = (FFABS(Ra - Rb) <= state->near);
            pred = RItype ? Ra : Rb;
            err = R(cur, x) - pred;

            if(!RItype && Ra > Rb)
                err = -err;

            if(state->near){
                if(err > 0)
                    err = (state->near + err) / state->twonear;
                else
                    err = -(state->near - err) / state->twonear;

                if(RItype || (Rb >= Ra))
                    Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
                else
                    Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
                W(cur, x, Ra);
            }
            if(err < 0)
                err += state->range;
            if(err >= ((state->range + 1) >> 1))
                err -= state->range;

            ls_encode_runterm(state, pb, RItype, err, ff_log2_run[state->run_index[comp]]);

            if(state->run_index[comp] > 0)
                state->run_index[comp]--;
        } else { /* regular mode */
            int context;

            context = ff_jpegls_quantize(state, D0) * 81 + ff_jpegls_quantize(state, D1) * 9 + ff_jpegls_quantize(state, D2);
            pred = mid_pred(Ra, Ra + Rb - Rc, Rb);

            if(context < 0){
                context = -context;
                sign = 1;
                pred = av_clip(pred - state->C[context], 0, state->maxval);
                err = pred - R(cur, x);
            }else{
                sign = 0;
                pred = av_clip(pred + state->C[context], 0, state->maxval);
                err = R(cur, x) - pred;
            }

            if(state->near){
                if(err > 0)
                    err = (state->near + err) / state->twonear;
                else
                    err = -(state->near - err) / state->twonear;
                if(!sign)
                    Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
                else
                    Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
                W(cur, x, Ra);
            }

            ls_encode_regular(state, pb, context, err);
        }
        x += stride;
    }
}

static void ls_store_lse(JLSState *state, PutBitContext *pb){
    /* Test if we have default params and don't need to store LSE */
    JLSState state2;
    memset(&state2, 0, sizeof(JLSState));
    state2.bpp = state->bpp;
    state2.near = state->near;
    ff_jpegls_reset_coding_parameters(&state2, 1);
    if(state->T1 == state2.T1 && state->T2 == state2.T2 && state->T3 == state2.T3 && state->reset == state2.reset)
        return;
    /* store LSE type 1 */
    put_marker(pb, LSE);
    put_bits(pb, 16, 13);
    put_bits(pb, 8,   1);
    put_bits(pb, 16, state->maxval);
    put_bits(pb, 16, state->T1);
    put_bits(pb, 16, state->T2);
    put_bits(pb, 16, state->T3);
    put_bits(pb, 16, state->reset);
}

static int encode_picture_ls(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
    JpeglsContext * const s = avctx->priv_data;
    AVFrame *pict = data;
    AVFrame * const p= (AVFrame*)&s->picture;
    const int near = avctx->prediction_method;
    PutBitContext pb, pb2;
    GetBitContext gb;
    uint8_t *buf2, *zero, *cur, *last;
    JLSState *state;
    int i, size;
    int comps;

    buf2 = av_malloc(buf_size);

    init_put_bits(&pb, buf, buf_size);
    init_put_bits(&pb2, buf2, buf_size);

    *p = *pict;
248
    p->pict_type= AV_PICTURE_TYPE_I;
249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371
    p->key_frame= 1;

    if(avctx->pix_fmt == PIX_FMT_GRAY8 || avctx->pix_fmt == PIX_FMT_GRAY16)
        comps = 1;
    else
        comps = 3;

    /* write our own JPEG header, can't use mjpeg_picture_header */
    put_marker(&pb, SOI);
    put_marker(&pb, SOF48);
    put_bits(&pb, 16, 8 + comps * 3); // header size depends on components
    put_bits(&pb,  8, (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 8); // bpp
    put_bits(&pb, 16, avctx->height);
    put_bits(&pb, 16, avctx->width);
    put_bits(&pb,  8, comps);         // components
    for(i = 1; i <= comps; i++) {
        put_bits(&pb,  8, i);    // component ID
        put_bits(&pb,  8, 0x11); // subsampling: none
        put_bits(&pb,  8, 0);    // Tiq, used by JPEG-LS ext
    }

    put_marker(&pb, SOS);
    put_bits(&pb, 16, 6 + comps * 2);
    put_bits(&pb,  8, comps);
    for(i = 1; i <= comps; i++) {
        put_bits(&pb,  8, i);  // component ID
        put_bits(&pb,  8, 0);  // mapping index: none
    }
    put_bits(&pb,  8, near);
    put_bits(&pb,  8, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
    put_bits(&pb,  8, 0); // point transform: none

    state = av_mallocz(sizeof(JLSState));
    /* initialize JPEG-LS state from JPEG parameters */
    state->near = near;
    state->bpp = (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 8;
    ff_jpegls_reset_coding_parameters(state, 0);
    ff_jpegls_init_state(state);

    ls_store_lse(state, &pb);

    zero = av_mallocz(p->linesize[0]);
    last = zero;
    cur = p->data[0];
    if(avctx->pix_fmt == PIX_FMT_GRAY8){
        int t = 0;

        for(i = 0; i < avctx->height; i++) {
            ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0,  8);
            t = last[0];
            last = cur;
            cur += p->linesize[0];
        }
    }else if(avctx->pix_fmt == PIX_FMT_GRAY16){
        int t = 0;

        for(i = 0; i < avctx->height; i++) {
            ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
            t = *((uint16_t*)last);
            last = cur;
            cur += p->linesize[0];
        }
    }else if(avctx->pix_fmt == PIX_FMT_RGB24){
        int j, width;
        int Rc[3] = {0, 0, 0};

        width = avctx->width * 3;
        for(i = 0; i < avctx->height; i++) {
            for(j = 0; j < 3; j++) {
                ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
                Rc[j] = last[j];
            }
            last = cur;
            cur += s->picture.linesize[0];
        }
    }else if(avctx->pix_fmt == PIX_FMT_BGR24){
        int j, width;
        int Rc[3] = {0, 0, 0};

        width = avctx->width * 3;
        for(i = 0; i < avctx->height; i++) {
            for(j = 2; j >= 0; j--) {
                ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
                Rc[j] = last[j];
            }
            last = cur;
            cur += s->picture.linesize[0];
        }
    }

    av_free(zero);
    av_free(state);

    // the specification says that after doing 0xff escaping unused bits in the
    // last byte must be set to 0, so just append 7 "optional" zero-bits to
    // avoid special-casing.
    put_bits(&pb2, 7, 0);
    size = put_bits_count(&pb2);
    flush_put_bits(&pb2);
    /* do escape coding */
    init_get_bits(&gb, buf2, size);
    size -= 7;
    while(get_bits_count(&gb) < size){
        int v;
        v = get_bits(&gb, 8);
        put_bits(&pb, 8, v);
        if(v == 0xFF){
            v = get_bits(&gb, 7);
            put_bits(&pb, 8, v);
        }
    }
    align_put_bits(&pb);
    av_free(buf2);

    /* End of image */
    put_marker(&pb, EOI);
    flush_put_bits(&pb);

    emms_c();

    return put_bits_count(&pb) >> 3;
}

372
static av_cold int encode_init_ls(AVCodecContext *ctx) {
373 374 375 376 377 378 379 380 381 382 383 384
    JpeglsContext *c = (JpeglsContext*)ctx->priv_data;

    c->avctx = ctx;
    ctx->coded_frame = &c->picture;

    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){
        av_log(ctx, AV_LOG_ERROR, "Only grayscale and RGB24/BGR24 images are supported\n");
        return -1;
    }
    return 0;
}

385
AVCodec ff_jpegls_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
386
    "jpegls",
387
    AVMEDIA_TYPE_VIDEO,
388 389 390 391 392
    CODEC_ID_JPEGLS,
    sizeof(JpeglsContext),
    encode_init_ls,
    encode_picture_ls,
    NULL,
393
    .pix_fmts= (const enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_RGB24, PIX_FMT_GRAY8, PIX_FMT_GRAY16, PIX_FMT_NONE},
394
    .long_name= NULL_IF_CONFIG_SMALL("JPEG-LS"),
395
};