libavcodec/jpeglsenc.c

   1 /*
   2  * JPEG-LS encoder
   3  * Copyright (c) 2003 Michael Niedermayer
   4  * Copyright (c) 2006 Konstantin Shishkov
   5  *
   6  * This file is part of FFmpeg.
   7  *
   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.
  12  *
  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.
  17  *
  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
  21  */
  22
  23 /**
  24  * @file libavcodec/jpeglsenc.c
  25  * JPEG-LS encoder.
  26  */
  27
  28 #include "avcodec.h"
  29 #include "get_bits.h"
  30 #include "golomb.h"
  31 #include "mathops.h"
  32 #include "dsputil.h"
  33 #include "mjpeg.h"
  34 #include "jpegls.h"
  35
  36
  37 /**
  38  * Encode error from regular symbol
  39  */
  40 static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q, int err){
  41     int k;
  42     int val;
  43     int map;
  44
  45     for(k = 0; (state->N[Q] << k) < state->A[Q]; k++);
  46
  47     map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
  48
  49     if(err < 0)
  50         err += state->range;
  51     if(err >= ((state->range + 1) >> 1)) {
  52         err -= state->range;
  53         val = 2 * FFABS(err) - 1 - map;
  54     } else
  55         val = 2 * err + map;
  56
  57     set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
  58
  59     ff_jpegls_update_state_regular(state, Q, err);
  60 }
  61
  62 /**
  63  * Encode error from run termination
  64  */
  65 static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb, int RItype, int err, int limit_add){
  66     int k;
  67     int val, map;
  68     int Q = 365 + RItype;
  69     int temp;
  70
  71     temp = state->A[Q];
  72     if(RItype)
  73         temp += state->N[Q] >> 1;
  74     for(k = 0; (state->N[Q] << k) < temp; k++);
  75     map = 0;
  76     if(!k && err && (2 * state->B[Q] < state->N[Q]))
  77         map = 1;
  78
  79     if(err < 0)
  80         val = - (2 * err) - 1 - RItype + map;
  81     else
  82         val = 2 * err - RItype - map;
  83     set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
  84
  85     if(err < 0)
  86         state->B[Q]++;
  87     state->A[Q] += (val + 1 - RItype) >> 1;
  88
  89     ff_jpegls_downscale_state(state, Q);
  90 }
  91
  92 /**
  93  * Encode run value as specified by JPEG-LS standard
  94  */
  95 static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run, int comp, int trail){
  96     while(run >= (1 << ff_log2_run[state->run_index[comp]])){
  97         put_bits(pb, 1, 1);
  98         run -= 1 << ff_log2_run[state->run_index[comp]];
  99         if(state->run_index[comp] < 31)
 100             state->run_index[comp]++;
 101     }
 102     /* if hit EOL, encode another full run, else encode aborted run */
 103     if(!trail && run) {
 104         put_bits(pb, 1, 1);
 105     }else if(trail){
 106         put_bits(pb, 1, 0);
 107         if(ff_log2_run[state->run_index[comp]])
 108             put_bits(pb, ff_log2_run[state->run_index[comp]], run);
 109     }
 110 }
 111
 112 /**
 113  * Encode one line of image
 114  */
 115 static inline void ls_encode_line(JLSState *state, PutBitContext *pb, void *last, void *cur, int last2, int w, int stride, int comp, int bits){
 116     int x = 0;
 117     int Ra, Rb, Rc, Rd;
 118     int D0, D1, D2;
 119
 120     while(x < w) {
 121         int err, pred, sign;
 122
 123         /* compute gradients */
 124         Ra = x ? R(cur, x - stride) : R(last, x);
 125         Rb = R(last, x);
 126         Rc = x ? R(last, x - stride) : last2;
 127         Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
 128         D0 = Rd - Rb;
 129         D1 = Rb - Rc;
 130         D2 = Rc - Ra;
 131
 132         /* run mode */
 133         if((FFABS(D0) <= state->near) && (FFABS(D1) <= state->near) && (FFABS(D2) <= state->near)) {
 134             int RUNval, RItype, run;
 135
 136             run = 0;
 137             RUNval = Ra;
 138             while(x < w && (FFABS(R(cur, x) - RUNval) <= state->near)){
 139                 run++;
 140                 W(cur, x, Ra);
 141                 x += stride;
 142             }
 143             ls_encode_run(state, pb, run, comp, x < w);
 144             if(x >= w)
 145                 return;
 146             Rb = R(last, x);
 147             RItype = (FFABS(Ra - Rb) <= state->near);
 148             pred = RItype ? Ra : Rb;
 149             err = R(cur, x) - pred;
 150
 151             if(!RItype && Ra > Rb)
 152                 err = -err;
 153
 154             if(state->near){
 155                 if(err > 0)
 156                     err = (state->near + err) / state->twonear;
 157                 else
 158                     err = -(state->near - err) / state->twonear;
 159
 160                 if(RItype || (Rb >= Ra))
 161                     Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
 162                 else
 163                     Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
 164                 W(cur, x, Ra);
 165             }
 166             if(err < 0)
 167                 err += state->range;
 168             if(err >= ((state->range + 1) >> 1))
 169                 err -= state->range;
 170
 171             ls_encode_runterm(state, pb, RItype, err, ff_log2_run[state->run_index[comp]]);
 172
 173             if(state->run_index[comp] > 0)
 174                 state->run_index[comp]--;
 175         } else { /* regular mode */
 176             int context;
 177
 178             context = ff_jpegls_quantize(state, D0) * 81 + ff_jpegls_quantize(state, D1) * 9 + ff_jpegls_quantize(state, D2);
 179             pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
 180
 181             if(context < 0){
 182                 context = -context;
 183                 sign = 1;
 184                 pred = av_clip(pred - state->C[context], 0, state->maxval);
 185                 err = pred - R(cur, x);
 186             }else{
 187                 sign = 0;
 188                 pred = av_clip(pred + state->C[context], 0, state->maxval);
 189                 err = R(cur, x) - pred;
 190             }
 191
 192             if(state->near){
 193                 if(err > 0)
 194                     err = (state->near + err) / state->twonear;
 195                 else
 196                     err = -(state->near - err) / state->twonear;
 197                 if(!sign)
 198                     Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
 199                 else
 200                     Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
 201                 W(cur, x, Ra);
 202             }
 203
 204             ls_encode_regular(state, pb, context, err);
 205         }
 206         x += stride;
 207     }
 208 }
 209
 210 static void ls_store_lse(JLSState *state, PutBitContext *pb){
 211     /* Test if we have default params and don't need to store LSE */
 212     JLSState state2;
 213     memset(&state2, 0, sizeof(JLSState));
 214     state2.bpp = state->bpp;
 215     state2.near = state->near;
 216     ff_jpegls_reset_coding_parameters(&state2, 1);
 217     if(state->T1 == state2.T1 && state->T2 == state2.T2 && state->T3 == state2.T3 && state->reset == state2.reset)
 218         return;
 219     /* store LSE type 1 */
 220     put_marker(pb, LSE);
 221     put_bits(pb, 16, 13);
 222     put_bits(pb, 8,   1);
 223     put_bits(pb, 16, state->maxval);
 224     put_bits(pb, 16, state->T1);
 225     put_bits(pb, 16, state->T2);
 226     put_bits(pb, 16, state->T3);
 227     put_bits(pb, 16, state->reset);
 228 }
 229
 230 static int encode_picture_ls(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
 231     JpeglsContext * const s = avctx->priv_data;
 232     AVFrame *pict = data;
 233     AVFrame * const p= (AVFrame*)&s->picture;
 234     const int near = avctx->prediction_method;
 235     PutBitContext pb, pb2;
 236     GetBitContext gb;
 237     uint8_t *buf2, *zero, *cur, *last;
 238     JLSState *state;
 239     int i, size;
 240     int comps;
 241
 242     buf2 = av_malloc(buf_size);
 243
 244     init_put_bits(&pb, buf, buf_size);
 245     init_put_bits(&pb2, buf2, buf_size);
 246
 247     *p = *pict;
 248     p->pict_type= FF_I_TYPE;
 249     p->key_frame= 1;
 250
 251     if(avctx->pix_fmt == PIX_FMT_GRAY8 || avctx->pix_fmt == PIX_FMT_GRAY16)
 252         comps = 1;
 253     else
 254         comps = 3;
 255
 256     /* write our own JPEG header, can't use mjpeg_picture_header */
 257     put_marker(&pb, SOI);
 258     put_marker(&pb, SOF48);
 259     put_bits(&pb, 16, 8 + comps * 3); // header size depends on components
 260     put_bits(&pb,  8, (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 8); // bpp
 261     put_bits(&pb, 16, avctx->height);
 262     put_bits(&pb, 16, avctx->width);
 263     put_bits(&pb,  8, comps);         // components
 264     for(i = 1; i <= comps; i++) {
 265         put_bits(&pb,  8, i);    // component ID
 266         put_bits(&pb,  8, 0x11); // subsampling: none
 267         put_bits(&pb,  8, 0);    // Tiq, used by JPEG-LS ext
 268     }
 269
 270     put_marker(&pb, SOS);
 271     put_bits(&pb, 16, 6 + comps * 2);
 272     put_bits(&pb,  8, comps);
 273     for(i = 1; i <= comps; i++) {
 274         put_bits(&pb,  8, i);  // component ID
 275         put_bits(&pb,  8, 0);  // mapping index: none
 276     }
 277     put_bits(&pb,  8, near);
 278     put_bits(&pb,  8, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
 279     put_bits(&pb,  8, 0); // point transform: none
 280
 281     state = av_mallocz(sizeof(JLSState));
 282     /* initialize JPEG-LS state from JPEG parameters */
 283     state->near = near;
 284     state->bpp = (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 8;
 285     ff_jpegls_reset_coding_parameters(state, 0);
 286     ff_jpegls_init_state(state);
 287
 288     ls_store_lse(state, &pb);
 289
 290     zero = av_mallocz(p->linesize[0]);
 291     last = zero;
 292     cur = p->data[0];
 293     if(avctx->pix_fmt == PIX_FMT_GRAY8){
 294         int t = 0;
 295
 296         for(i = 0; i < avctx->height; i++) {
 297             ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0,  8);
 298             t = last[0];
 299             last = cur;
 300             cur += p->linesize[0];
 301         }
 302     }else if(avctx->pix_fmt == PIX_FMT_GRAY16){
 303         int t = 0;
 304
 305         for(i = 0; i < avctx->height; i++) {
 306             ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
 307             t = *((uint16_t*)last);
 308             last = cur;
 309             cur += p->linesize[0];
 310         }
 311     }else if(avctx->pix_fmt == PIX_FMT_RGB24){
 312         int j, width;
 313         int Rc[3] = {0, 0, 0};
 314
 315         width = avctx->width * 3;
 316         for(i = 0; i < avctx->height; i++) {
 317             for(j = 0; j < 3; j++) {
 318                 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
 319                 Rc[j] = last[j];
 320             }
 321             last = cur;
 322             cur += s->picture.linesize[0];
 323         }
 324     }else if(avctx->pix_fmt == PIX_FMT_BGR24){
 325         int j, width;
 326         int Rc[3] = {0, 0, 0};
 327
 328         width = avctx->width * 3;
 329         for(i = 0; i < avctx->height; i++) {
 330             for(j = 2; j >= 0; j--) {
 331                 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
 332                 Rc[j] = last[j];
 333             }
 334             last = cur;
 335             cur += s->picture.linesize[0];
 336         }
 337     }
 338
 339     av_free(zero);
 340     av_free(state);
 341
 342     // the specification says that after doing 0xff escaping unused bits in the
 343     // last byte must be set to 0, so just append 7 "optional" zero-bits to
 344     // avoid special-casing.
 345     put_bits(&pb2, 7, 0);
 346     size = put_bits_count(&pb2);
 347     flush_put_bits(&pb2);
 348     /* do escape coding */
 349     init_get_bits(&gb, buf2, size);
 350     size -= 7;
 351     while(get_bits_count(&gb) < size){
 352         int v;
 353         v = get_bits(&gb, 8);
 354         put_bits(&pb, 8, v);
 355         if(v == 0xFF){
 356             v = get_bits(&gb, 7);
 357             put_bits(&pb, 8, v);
 358         }
 359     }
 360     align_put_bits(&pb);
 361     av_free(buf2);
 362
 363     /* End of image */
 364     put_marker(&pb, EOI);
 365     flush_put_bits(&pb);
 366
 367     emms_c();
 368
 369     return put_bits_count(&pb) >> 3;
 370 }
 371
 372 static av_cold int encode_init_ls(AVCodecContext *ctx) {
 373     JpeglsContext *c = (JpeglsContext*)ctx->priv_data;
 374
 375     c->avctx = ctx;
 376     ctx->coded_frame = &c->picture;
 377
 378     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;
 383 }
 384
 385 AVCodec jpegls_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
 386     "jpegls",
 387     CODEC_TYPE_VIDEO,
 388     CODEC_ID_JPEGLS,
 389     sizeof(JpeglsContext),
 390     encode_init_ls,
 391     encode_picture_ls,
 392     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 };