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 jpeglsenc.c
  25  * JPEG-LS encoder.
  26  */
  27
  28 #include "avcodec.h"
  29 #include "bitstream.h"
  30 #include "golomb.h"
  31 #include "dsputil.h"
  32 #include "mjpeg.h"
  33 #include "jpegls.h"
  34
  35
  36 /**
  37  * Encode error from regular symbol
  38  */
  39 static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q, int err){
  40     int k;
  41     int val;
  42     int map;
  43
  44     for(k = 0; (state->N[Q] << k) < state->A[Q]; k++);
  45
  46     map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
  47
  48     if(err < 0)
  49         err += state->range;
  50     if(err >= ((state->range + 1) >> 1)) {
  51         err -= state->range;
  52         val = 2 * FFABS(err) - 1 - map;
  53     } else
  54         val = 2 * err + map;
  55
  56     set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
  57
  58     ff_jpegls_update_state_regular(state, Q, err);
  59 }
  60
  61 /**
  62  * Encode error from run termination
  63  */
  64 static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb, int RItype, int err, int limit_add){
  65     int k;
  66     int val, map;
  67     int Q = 365 + RItype;
  68     int temp;
  69
  70     temp = state->A[Q];
  71     if(RItype)
  72         temp += state->N[Q] >> 1;
  73     for(k = 0; (state->N[Q] << k) < temp; k++);
  74     map = 0;
  75     if(!k && err && (2 * state->B[Q] < state->N[Q]))
  76         map = 1;
  77
  78     if(err < 0)
  79         val = - (2 * err) - 1 - RItype + map;
  80     else
  81         val = 2 * err - RItype - map;
  82     set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
  83
  84     if(err < 0)
  85         state->B[Q]++;
  86     state->A[Q] += (val + 1 - RItype) >> 1;
  87
  88     ff_jpegls_downscale_state(state, Q);
  89 }
  90
  91 /**
  92  * Encode run value as specified by JPEG-LS standard
  93  */
  94 static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run, int comp, int trail){
  95     while(run >= (1 << ff_log2_run[state->run_index[comp]])){
  96         put_bits(pb, 1, 1);
  97         run -= 1 << ff_log2_run[state->run_index[comp]];
  98         if(state->run_index[comp] < 31)
  99             state->run_index[comp]++;
 100     }
 101     /* if hit EOL, encode another full run, else encode aborted run */
 102     if(!trail && run) {
 103         put_bits(pb, 1, 1);
 104     }else if(trail){
 105         put_bits(pb, 1, 0);
 106         if(ff_log2_run[state->run_index[comp]])
 107             put_bits(pb, ff_log2_run[state->run_index[comp]], run);
 108     }
 109 }
 110
 111 /**
 112  * Encode one line of image
 113  */
 114 static inline void ls_encode_line(JLSState *state, PutBitContext *pb, void *last, void *cur, int last2, int w, int stride, int comp, int bits){
 115     int x = 0;
 116     int Ra, Rb, Rc, Rd;
 117     int D0, D1, D2;
 118
 119     while(x < w) {
 120         int err, pred, sign;
 121
 122         /* compute gradients */
 123         Ra = x ? R(cur, x - stride) : R(last, x);
 124         Rb = R(last, x);
 125         Rc = x ? R(last, x - stride) : last2;
 126         Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
 127         D0 = Rd - Rb;
 128         D1 = Rb - Rc;
 129         D2 = Rc - Ra;
 130
 131         /* run mode */
 132         if((FFABS(D0) <= state->near) && (FFABS(D1) <= state->near) && (FFABS(D2) <= state->near)) {
 133             int RUNval, RItype, run;
 134
 135             run = 0;
 136             RUNval = Ra;
 137             while(x < w && (FFABS(R(cur, x) - RUNval) <= state->near)){
 138                 run++;
 139                 W(cur, x, Ra);
 140                 x += stride;
 141             }
 142             ls_encode_run(state, pb, run, comp, x < w);
 143             if(x >= w)
 144                 return;
 145             Rb = R(last, x);
 146             RItype = (FFABS(Ra - Rb) <= state->near);
 147             pred = RItype ? Ra : Rb;
 148             err = R(cur, x) - pred;
 149
 150             if(!RItype && Ra > Rb)
 151                 err = -err;
 152
 153             if(state->near){
 154                 if(err > 0)
 155                     err = (state->near + err) / state->twonear;
 156                 else
 157                     err = -(state->near - err) / state->twonear;
 158
 159                 if(RItype || (Rb >= Ra))
 160                     Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
 161                 else
 162                     Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
 163                 W(cur, x, Ra);
 164             }
 165             if(err < 0)
 166                 err += state->range;
 167             if(err >= ((state->range + 1) >> 1))
 168                 err -= state->range;
 169
 170             ls_encode_runterm(state, pb, RItype, err, ff_log2_run[state->run_index[comp]]);
 171
 172             if(state->run_index[comp] > 0)
 173                 state->run_index[comp]--;
 174         } else { /* regular mode */
 175             int context;
 176
 177             context = ff_jpegls_quantize(state, D0) * 81 + ff_jpegls_quantize(state, D1) * 9 + ff_jpegls_quantize(state, D2);
 178             pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
 179
 180             if(context < 0){
 181                 context = -context;
 182                 sign = 1;
 183                 pred = av_clip(pred - state->C[context], 0, state->maxval);
 184                 err = pred - R(cur, x);
 185             }else{
 186                 sign = 0;
 187                 pred = av_clip(pred + state->C[context], 0, state->maxval);
 188                 err = R(cur, x) - pred;
 189             }
 190
 191             if(state->near){
 192                 if(err > 0)
 193                     err = (state->near + err) / state->twonear;
 194                 else
 195                     err = -(state->near - err) / state->twonear;
 196                 if(!sign)
 197                     Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
 198                 else
 199                     Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
 200                 W(cur, x, Ra);
 201             }
 202
 203             ls_encode_regular(state, pb, context, err);
 204         }
 205         x += stride;
 206     }
 207 }
 208
 209 static void ls_store_lse(JLSState *state, PutBitContext *pb){
 210     /* Test if we have default params and don't need to store LSE */
 211     JLSState state2;
 212     memset(&state2, 0, sizeof(JLSState));
 213     state2.bpp = state->bpp;
 214     state2.near = state->near;
 215     ff_jpegls_reset_coding_parameters(&state2, 1);
 216     if(state->T1 == state2.T1 && state->T2 == state2.T2 && state->T3 == state2.T3 && state->reset == state2.reset)
 217         return;
 218     /* store LSE type 1 */
 219     put_marker(pb, LSE);
 220     put_bits(pb, 16, 13);
 221     put_bits(pb, 8,   1);
 222     put_bits(pb, 16, state->maxval);
 223     put_bits(pb, 16, state->T1);
 224     put_bits(pb, 16, state->T2);
 225     put_bits(pb, 16, state->T3);
 226     put_bits(pb, 16, state->reset);
 227 }
 228
 229 static int encode_picture_ls(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
 230     JpeglsContext * const s = avctx->priv_data;
 231     AVFrame *pict = data;
 232     AVFrame * const p= (AVFrame*)&s->picture;
 233     const int near = avctx->prediction_method;
 234     PutBitContext pb, pb2;
 235     GetBitContext gb;
 236     uint8_t *buf2, *zero, *cur, *last;
 237     JLSState *state;
 238     int i, size;
 239     int comps;
 240
 241     buf2 = av_malloc(buf_size);
 242
 243     init_put_bits(&pb, buf, buf_size);
 244     init_put_bits(&pb2, buf2, buf_size);
 245
 246     *p = *pict;
 247     p->pict_type= FF_I_TYPE;
 248     p->key_frame= 1;
 249
 250     if(avctx->pix_fmt == PIX_FMT_GRAY8 || avctx->pix_fmt == PIX_FMT_GRAY16)
 251         comps = 1;
 252     else
 253         comps = 3;
 254
 255     /* write our own JPEG header, can't use mjpeg_picture_header */
 256     put_marker(&pb, SOI);
 257     put_marker(&pb, SOF48);
 258     put_bits(&pb, 16, 8 + comps * 3); // header size depends on components
 259     put_bits(&pb,  8, (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 8); // bpp
 260     put_bits(&pb, 16, avctx->height);
 261     put_bits(&pb, 16, avctx->width);
 262     put_bits(&pb,  8, comps);         // components
 263     for(i = 1; i <= comps; i++) {
 264         put_bits(&pb,  8, i);    // component ID
 265         put_bits(&pb,  8, 0x11); // subsampling: none
 266         put_bits(&pb,  8, 0);    // Tiq, used by JPEG-LS ext
 267     }
 268
 269     put_marker(&pb, SOS);
 270     put_bits(&pb, 16, 6 + comps * 2);
 271     put_bits(&pb,  8, comps);
 272     for(i = 1; i <= comps; i++) {
 273         put_bits(&pb,  8, i);  // component ID
 274         put_bits(&pb,  8, 0);  // mapping index: none
 275     }
 276     put_bits(&pb,  8, near);
 277     put_bits(&pb,  8, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
 278     put_bits(&pb,  8, 0); // point transform: none
 279
 280     state = av_mallocz(sizeof(JLSState));
 281     /* initialize JPEG-LS state from JPEG parameters */
 282     state->near = near;
 283     state->bpp = (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 8;
 284     ff_jpegls_reset_coding_parameters(state, 0);
 285     ff_jpegls_init_state(state);
 286
 287     ls_store_lse(state, &pb);
 288
 289     zero = av_mallocz(p->linesize[0]);
 290     last = zero;
 291     cur = p->data[0];
 292     if(avctx->pix_fmt == PIX_FMT_GRAY8){
 293         int t = 0;
 294
 295         for(i = 0; i < avctx->height; i++) {
 296             ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0,  8);
 297             t = last[0];
 298             last = cur;
 299             cur += p->linesize[0];
 300         }
 301     }else if(avctx->pix_fmt == PIX_FMT_GRAY16){
 302         int t = 0;
 303
 304         for(i = 0; i < avctx->height; i++) {
 305             ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
 306             t = *((uint16_t*)last);
 307             last = cur;
 308             cur += p->linesize[0];
 309         }
 310     }else if(avctx->pix_fmt == PIX_FMT_RGB24){
 311         int j, width;
 312         int Rc[3] = {0, 0, 0};
 313
 314         width = avctx->width * 3;
 315         for(i = 0; i < avctx->height; i++) {
 316             for(j = 0; j < 3; j++) {
 317                 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
 318                 Rc[j] = last[j];
 319             }
 320             last = cur;
 321             cur += s->picture.linesize[0];
 322         }
 323     }else if(avctx->pix_fmt == PIX_FMT_BGR24){
 324         int j, width;
 325         int Rc[3] = {0, 0, 0};
 326
 327         width = avctx->width * 3;
 328         for(i = 0; i < avctx->height; i++) {
 329             for(j = 2; j >= 0; j--) {
 330                 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
 331                 Rc[j] = last[j];
 332             }
 333             last = cur;
 334             cur += s->picture.linesize[0];
 335         }
 336     }
 337
 338     av_free(zero);
 339     av_free(state);
 340
 341     // the specification says that after doing 0xff escaping unused bits in the
 342     // last byte must be set to 0, so just append 7 "optional" zero-bits to
 343     // avoid special-casing.
 344     put_bits(&pb2, 7, 0);
 345     size = put_bits_count(&pb2);
 346     flush_put_bits(&pb2);
 347     /* do escape coding */
 348     init_get_bits(&gb, buf2, size);
 349     size -= 7;
 350     while(get_bits_count(&gb) < size){
 351         int v;
 352         v = get_bits(&gb, 8);
 353         put_bits(&pb, 8, v);
 354         if(v == 0xFF){
 355             v = get_bits(&gb, 7);
 356             put_bits(&pb, 8, v);
 357         }
 358     }
 359     align_put_bits(&pb);
 360     av_free(buf2);
 361
 362     /* End of image */
 363     put_marker(&pb, EOI);
 364     flush_put_bits(&pb);
 365
 366     emms_c();
 367
 368     return put_bits_count(&pb) >> 3;
 369 }
 370
 371 static av_cold int encode_init_ls(AVCodecContext *ctx) {
 372     JpeglsContext *c = (JpeglsContext*)ctx->priv_data;
 373
 374     c->avctx = ctx;
 375     ctx->coded_frame = &c->picture;
 376
 377     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){
 378         av_log(ctx, AV_LOG_ERROR, "Only grayscale and RGB24/BGR24 images are supported\n");
 379         return -1;
 380     }
 381     return 0;
 382 }
 383
 384 AVCodec jpegls_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
 385     "jpegls",
 386     CODEC_TYPE_VIDEO,
 387     CODEC_ID_JPEGLS,
 388     sizeof(JpeglsContext),
 389     encode_init_ls,
 390     encode_picture_ls,
 391     NULL,
 392     .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_RGB24, PIX_FMT_GRAY8, PIX_FMT_GRAY16, PIX_FMT_NONE},
 393     .long_name= NULL_IF_CONFIG_SMALL("JPEG-LS"),
 394 };