yading@10: /*
yading@10:  * JPEG-LS encoder
yading@10:  * Copyright (c) 2003 Michael Niedermayer
yading@10:  * Copyright (c) 2006 Konstantin Shishkov
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * JPEG-LS encoder.
yading@10:  */
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "get_bits.h"
yading@10: #include "put_bits.h"
yading@10: #include "golomb.h"
yading@10: #include "internal.h"
yading@10: #include "mathops.h"
yading@10: #include "mjpeg.h"
yading@10: #include "jpegls.h"
yading@10: 
yading@10: 
yading@10: /**
yading@10:  * Encode error from regular symbol
yading@10:  */
yading@10: static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q, int err){
yading@10:     int k;
yading@10:     int val;
yading@10:     int map;
yading@10: 
yading@10:     for(k = 0; (state->N[Q] << k) < state->A[Q]; k++);
yading@10: 
yading@10:     map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
yading@10: 
yading@10:     if(err < 0)
yading@10:         err += state->range;
yading@10:     if(err >= ((state->range + 1) >> 1)) {
yading@10:         err -= state->range;
yading@10:         val = 2 * FFABS(err) - 1 - map;
yading@10:     } else
yading@10:         val = 2 * err + map;
yading@10: 
yading@10:     set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
yading@10: 
yading@10:     ff_jpegls_update_state_regular(state, Q, err);
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Encode error from run termination
yading@10:  */
yading@10: static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb, int RItype, int err, int limit_add){
yading@10:     int k;
yading@10:     int val, map;
yading@10:     int Q = 365 + RItype;
yading@10:     int temp;
yading@10: 
yading@10:     temp = state->A[Q];
yading@10:     if(RItype)
yading@10:         temp += state->N[Q] >> 1;
yading@10:     for(k = 0; (state->N[Q] << k) < temp; k++);
yading@10:     map = 0;
yading@10:     if(!k && err && (2 * state->B[Q] < state->N[Q]))
yading@10:         map = 1;
yading@10: 
yading@10:     if(err < 0)
yading@10:         val = - (2 * err) - 1 - RItype + map;
yading@10:     else
yading@10:         val = 2 * err - RItype - map;
yading@10:     set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
yading@10: 
yading@10:     if(err < 0)
yading@10:         state->B[Q]++;
yading@10:     state->A[Q] += (val + 1 - RItype) >> 1;
yading@10: 
yading@10:     ff_jpegls_downscale_state(state, Q);
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Encode run value as specified by JPEG-LS standard
yading@10:  */
yading@10: static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run, int comp, int trail){
yading@10:     while(run >= (1 << ff_log2_run[state->run_index[comp]])){
yading@10:         put_bits(pb, 1, 1);
yading@10:         run -= 1 << ff_log2_run[state->run_index[comp]];
yading@10:         if(state->run_index[comp] < 31)
yading@10:             state->run_index[comp]++;
yading@10:     }
yading@10:     /* if hit EOL, encode another full run, else encode aborted run */
yading@10:     if(!trail && run) {
yading@10:         put_bits(pb, 1, 1);
yading@10:     }else if(trail){
yading@10:         put_bits(pb, 1, 0);
yading@10:         if(ff_log2_run[state->run_index[comp]])
yading@10:             put_bits(pb, ff_log2_run[state->run_index[comp]], run);
yading@10:     }
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Encode one line of image
yading@10:  */
yading@10: static inline void ls_encode_line(JLSState *state, PutBitContext *pb, void *last, void *cur, int last2, int w, int stride, int comp, int bits){
yading@10:     int x = 0;
yading@10:     int Ra, Rb, Rc, Rd;
yading@10:     int D0, D1, D2;
yading@10: 
yading@10:     while(x < w) {
yading@10:         int err, pred, sign;
yading@10: 
yading@10:         /* compute gradients */
yading@10:         Ra = x ? R(cur, x - stride) : R(last, x);
yading@10:         Rb = R(last, x);
yading@10:         Rc = x ? R(last, x - stride) : last2;
yading@10:         Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
yading@10:         D0 = Rd - Rb;
yading@10:         D1 = Rb - Rc;
yading@10:         D2 = Rc - Ra;
yading@10: 
yading@10:         /* run mode */
yading@10:         if((FFABS(D0) <= state->near) && (FFABS(D1) <= state->near) && (FFABS(D2) <= state->near)) {
yading@10:             int RUNval, RItype, run;
yading@10: 
yading@10:             run = 0;
yading@10:             RUNval = Ra;
yading@10:             while(x < w && (FFABS(R(cur, x) - RUNval) <= state->near)){
yading@10:                 run++;
yading@10:                 W(cur, x, Ra);
yading@10:                 x += stride;
yading@10:             }
yading@10:             ls_encode_run(state, pb, run, comp, x < w);
yading@10:             if(x >= w)
yading@10:                 return;
yading@10:             Rb = R(last, x);
yading@10:             RItype = (FFABS(Ra - Rb) <= state->near);
yading@10:             pred = RItype ? Ra : Rb;
yading@10:             err = R(cur, x) - pred;
yading@10: 
yading@10:             if(!RItype && Ra > Rb)
yading@10:                 err = -err;
yading@10: 
yading@10:             if(state->near){
yading@10:                 if(err > 0)
yading@10:                     err = (state->near + err) / state->twonear;
yading@10:                 else
yading@10:                     err = -(state->near - err) / state->twonear;
yading@10: 
yading@10:                 if(RItype || (Rb >= Ra))
yading@10:                     Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
yading@10:                 else
yading@10:                     Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
yading@10:                 W(cur, x, Ra);
yading@10:             }
yading@10:             if(err < 0)
yading@10:                 err += state->range;
yading@10:             if(err >= ((state->range + 1) >> 1))
yading@10:                 err -= state->range;
yading@10: 
yading@10:             ls_encode_runterm(state, pb, RItype, err, ff_log2_run[state->run_index[comp]]);
yading@10: 
yading@10:             if(state->run_index[comp] > 0)
yading@10:                 state->run_index[comp]--;
yading@10:         } else { /* regular mode */
yading@10:             int context;
yading@10: 
yading@10:             context = ff_jpegls_quantize(state, D0) * 81 + ff_jpegls_quantize(state, D1) * 9 + ff_jpegls_quantize(state, D2);
yading@10:             pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
yading@10: 
yading@10:             if(context < 0){
yading@10:                 context = -context;
yading@10:                 sign = 1;
yading@10:                 pred = av_clip(pred - state->C[context], 0, state->maxval);
yading@10:                 err = pred - R(cur, x);
yading@10:             }else{
yading@10:                 sign = 0;
yading@10:                 pred = av_clip(pred + state->C[context], 0, state->maxval);
yading@10:                 err = R(cur, x) - pred;
yading@10:             }
yading@10: 
yading@10:             if(state->near){
yading@10:                 if(err > 0)
yading@10:                     err = (state->near + err) / state->twonear;
yading@10:                 else
yading@10:                     err = -(state->near - err) / state->twonear;
yading@10:                 if(!sign)
yading@10:                     Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
yading@10:                 else
yading@10:                     Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
yading@10:                 W(cur, x, Ra);
yading@10:             }
yading@10: 
yading@10:             ls_encode_regular(state, pb, context, err);
yading@10:         }
yading@10:         x += stride;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void ls_store_lse(JLSState *state, PutBitContext *pb){
yading@10:     /* Test if we have default params and don't need to store LSE */
yading@10:     JLSState state2 = { 0 };
yading@10:     state2.bpp = state->bpp;
yading@10:     state2.near = state->near;
yading@10:     ff_jpegls_reset_coding_parameters(&state2, 1);
yading@10:     if(state->T1 == state2.T1 && state->T2 == state2.T2 && state->T3 == state2.T3 && state->reset == state2.reset)
yading@10:         return;
yading@10:     /* store LSE type 1 */
yading@10:     put_marker(pb, LSE);
yading@10:     put_bits(pb, 16, 13);
yading@10:     put_bits(pb, 8,   1);
yading@10:     put_bits(pb, 16, state->maxval);
yading@10:     put_bits(pb, 16, state->T1);
yading@10:     put_bits(pb, 16, state->T2);
yading@10:     put_bits(pb, 16, state->T3);
yading@10:     put_bits(pb, 16, state->reset);
yading@10: }
yading@10: 
yading@10: static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
yading@10:                              const AVFrame *pict, int *got_packet)
yading@10: {
yading@10:     JpeglsContext * const s = avctx->priv_data;
yading@10:     AVFrame * const p = &s->picture;
yading@10:     const int near = avctx->prediction_method;
yading@10:     PutBitContext pb, pb2;
yading@10:     GetBitContext gb;
yading@10:     uint8_t *buf2, *zero, *cur, *last;
yading@10:     JLSState *state;
yading@10:     int i, size, ret;
yading@10:     int comps;
yading@10: 
yading@10:     *p = *pict;
yading@10:     p->pict_type= AV_PICTURE_TYPE_I;
yading@10:     p->key_frame= 1;
yading@10: 
yading@10:     if(avctx->pix_fmt == AV_PIX_FMT_GRAY8 || avctx->pix_fmt == AV_PIX_FMT_GRAY16)
yading@10:         comps = 1;
yading@10:     else
yading@10:         comps = 3;
yading@10: 
yading@10:     if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width*avctx->height*comps*4 +
yading@10:                                     FF_MIN_BUFFER_SIZE)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     buf2 = av_malloc(pkt->size);
yading@10: 
yading@10:     init_put_bits(&pb, pkt->data, pkt->size);
yading@10:     init_put_bits(&pb2, buf2, pkt->size);
yading@10: 
yading@10:     /* write our own JPEG header, can't use mjpeg_picture_header */
yading@10:     put_marker(&pb, SOI);
yading@10:     put_marker(&pb, SOF48);
yading@10:     put_bits(&pb, 16, 8 + comps * 3); // header size depends on components
yading@10:     put_bits(&pb,  8, (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8); // bpp
yading@10:     put_bits(&pb, 16, avctx->height);
yading@10:     put_bits(&pb, 16, avctx->width);
yading@10:     put_bits(&pb,  8, comps);         // components
yading@10:     for(i = 1; i <= comps; i++) {
yading@10:         put_bits(&pb,  8, i);    // component ID
yading@10:         put_bits(&pb,  8, 0x11); // subsampling: none
yading@10:         put_bits(&pb,  8, 0);    // Tiq, used by JPEG-LS ext
yading@10:     }
yading@10: 
yading@10:     put_marker(&pb, SOS);
yading@10:     put_bits(&pb, 16, 6 + comps * 2);
yading@10:     put_bits(&pb,  8, comps);
yading@10:     for(i = 1; i <= comps; i++) {
yading@10:         put_bits(&pb,  8, i);  // component ID
yading@10:         put_bits(&pb,  8, 0);  // mapping index: none
yading@10:     }
yading@10:     put_bits(&pb,  8, near);
yading@10:     put_bits(&pb,  8, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
yading@10:     put_bits(&pb,  8, 0); // point transform: none
yading@10: 
yading@10:     state = av_mallocz(sizeof(JLSState));
yading@10:     /* initialize JPEG-LS state from JPEG parameters */
yading@10:     state->near = near;
yading@10:     state->bpp = (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8;
yading@10:     ff_jpegls_reset_coding_parameters(state, 0);
yading@10:     ff_jpegls_init_state(state);
yading@10: 
yading@10:     ls_store_lse(state, &pb);
yading@10: 
yading@10:     zero = av_mallocz(FFABS(p->linesize[0]));
yading@10:     if (!zero) {
yading@10:         av_free(state);
yading@10:         return AVERROR(ENOMEM);
yading@10:     }
yading@10:     last = zero;
yading@10:     cur = p->data[0];
yading@10:     if(avctx->pix_fmt == AV_PIX_FMT_GRAY8){
yading@10:         int t = 0;
yading@10: 
yading@10:         for(i = 0; i < avctx->height; i++) {
yading@10:             ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0,  8);
yading@10:             t = last[0];
yading@10:             last = cur;
yading@10:             cur += p->linesize[0];
yading@10:         }
yading@10:     }else if(avctx->pix_fmt == AV_PIX_FMT_GRAY16){
yading@10:         int t = 0;
yading@10: 
yading@10:         for(i = 0; i < avctx->height; i++) {
yading@10:             ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
yading@10:             t = *((uint16_t*)last);
yading@10:             last = cur;
yading@10:             cur += p->linesize[0];
yading@10:         }
yading@10:     }else if(avctx->pix_fmt == AV_PIX_FMT_RGB24){
yading@10:         int j, width;
yading@10:         int Rc[3] = {0, 0, 0};
yading@10: 
yading@10:         width = avctx->width * 3;
yading@10:         for(i = 0; i < avctx->height; i++) {
yading@10:             for(j = 0; j < 3; j++) {
yading@10:                 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
yading@10:                 Rc[j] = last[j];
yading@10:             }
yading@10:             last = cur;
yading@10:             cur += s->picture.linesize[0];
yading@10:         }
yading@10:     }else if(avctx->pix_fmt == AV_PIX_FMT_BGR24){
yading@10:         int j, width;
yading@10:         int Rc[3] = {0, 0, 0};
yading@10: 
yading@10:         width = avctx->width * 3;
yading@10:         for(i = 0; i < avctx->height; i++) {
yading@10:             for(j = 2; j >= 0; j--) {
yading@10:                 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
yading@10:                 Rc[j] = last[j];
yading@10:             }
yading@10:             last = cur;
yading@10:             cur += s->picture.linesize[0];
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     av_freep(&zero);
yading@10:     av_freep(&state);
yading@10: 
yading@10:     // the specification says that after doing 0xff escaping unused bits in the
yading@10:     // last byte must be set to 0, so just append 7 "optional" zero-bits to
yading@10:     // avoid special-casing.
yading@10:     put_bits(&pb2, 7, 0);
yading@10:     size = put_bits_count(&pb2);
yading@10:     flush_put_bits(&pb2);
yading@10:     /* do escape coding */
yading@10:     init_get_bits(&gb, buf2, size);
yading@10:     size -= 7;
yading@10:     while(get_bits_count(&gb) < size){
yading@10:         int v;
yading@10:         v = get_bits(&gb, 8);
yading@10:         put_bits(&pb, 8, v);
yading@10:         if(v == 0xFF){
yading@10:             v = get_bits(&gb, 7);
yading@10:             put_bits(&pb, 8, v);
yading@10:         }
yading@10:     }
yading@10:     avpriv_align_put_bits(&pb);
yading@10:     av_free(buf2);
yading@10: 
yading@10:     /* End of image */
yading@10:     put_marker(&pb, EOI);
yading@10:     flush_put_bits(&pb);
yading@10: 
yading@10:     emms_c();
yading@10: 
yading@10:     pkt->size   = put_bits_count(&pb) >> 3;
yading@10:     pkt->flags |= AV_PKT_FLAG_KEY;
yading@10:     *got_packet = 1;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int encode_init_ls(AVCodecContext *ctx) {
yading@10:     JpeglsContext *c = (JpeglsContext*)ctx->priv_data;
yading@10: 
yading@10:     c->avctx = ctx;
yading@10:     ctx->coded_frame = &c->picture;
yading@10: 
yading@10:     if(ctx->pix_fmt != AV_PIX_FMT_GRAY8 && ctx->pix_fmt != AV_PIX_FMT_GRAY16 && ctx->pix_fmt != AV_PIX_FMT_RGB24 && ctx->pix_fmt != AV_PIX_FMT_BGR24){
yading@10:         av_log(ctx, AV_LOG_ERROR, "Only grayscale and RGB24/BGR24 images are supported\n");
yading@10:         return -1;
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_jpegls_encoder = {
yading@10:     .name           = "jpegls",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_JPEGLS,
yading@10:     .priv_data_size = sizeof(JpeglsContext),
yading@10:     .init           = encode_init_ls,
yading@10:     .encode2        = encode_picture_ls,
yading@10:     .pix_fmts       = (const enum AVPixelFormat[]){
yading@10:         AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24, AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16,
yading@10:         AV_PIX_FMT_NONE
yading@10:     },
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("JPEG-LS"),
yading@10: };