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