/* * 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 */ /** * @file * JPEG-LS encoder. */ #include "avcodec.h" #include "get_bits.h" #include "golomb.h" #include "internal.h" #include "mathops.h" #include "dsputil.h" #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 = { 0 }; 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, AVPacket *pkt, const AVFrame *pict, int *got_packet) { JpeglsContext * const s = avctx->priv_data; AVFrame * const p = &s->picture; const int near = avctx->prediction_method; PutBitContext pb, pb2; GetBitContext gb; uint8_t *buf2, *zero, *cur, *last; JLSState *state; int i, size, ret; int comps; *p = *pict; p->pict_type= AV_PICTURE_TYPE_I; p->key_frame= 1; if(avctx->pix_fmt == AV_PIX_FMT_GRAY8 || avctx->pix_fmt == AV_PIX_FMT_GRAY16) comps = 1; else comps = 3; if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width*avctx->height*comps*4 + FF_MIN_BUFFER_SIZE)) < 0) return ret; buf2 = av_malloc(pkt->size); init_put_bits(&pb, pkt->data, pkt->size); init_put_bits(&pb2, buf2, pkt->size); /* 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 == AV_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 == AV_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(FFABS(p->linesize[0])); if (!zero) { av_free(state); return AVERROR(ENOMEM); } last = zero; cur = p->data[0]; if(avctx->pix_fmt == AV_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 == AV_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 == AV_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 == AV_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_freep(&zero); av_freep(&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); } } avpriv_align_put_bits(&pb); av_free(buf2); /* End of image */ put_marker(&pb, EOI); flush_put_bits(&pb); emms_c(); pkt->size = put_bits_count(&pb) >> 3; pkt->flags |= AV_PKT_FLAG_KEY; *got_packet = 1; return 0; } static av_cold int encode_init_ls(AVCodecContext *ctx) { JpeglsContext *c = (JpeglsContext*)ctx->priv_data; c->avctx = ctx; ctx->coded_frame = &c->picture; 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){ av_log(ctx, AV_LOG_ERROR, "Only grayscale and RGB24/BGR24 images are supported\n"); return -1; } return 0; } AVCodec ff_jpegls_encoder = { .name = "jpegls", .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_JPEGLS, .priv_data_size = sizeof(JpeglsContext), .init = encode_init_ls, .encode2 = encode_picture_ls, .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24, AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16, AV_PIX_FMT_NONE }, .long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"), };