/* * JPEG-LS decoder * 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 decoder. */ #include "avcodec.h" #include "get_bits.h" #include "golomb.h" #include "internal.h" #include "mathops.h" #include "mjpeg.h" #include "mjpegdec.h" #include "jpegls.h" #include "jpeglsdec.h" /* * Uncomment this to significantly speed up decoding of broken JPEG-LS * (or test broken JPEG-LS decoder) and slow down ordinary decoding a bit. * * There is no Golomb code with length >= 32 bits possible, so check and * avoid situation of 32 zeros, FFmpeg Golomb decoder is painfully slow * on this errors. */ //#define JLS_BROKEN /** * Decode LSE block with initialization parameters */ int ff_jpegls_decode_lse(MJpegDecodeContext *s) { int id; int tid, wt, maxtab, i, j; int len = get_bits(&s->gb, 16); id = get_bits(&s->gb, 8); switch (id) { case 1: if (len < 13) return AVERROR_INVALIDDATA; s->maxval = get_bits(&s->gb, 16); s->t1 = get_bits(&s->gb, 16); s->t2 = get_bits(&s->gb, 16); s->t3 = get_bits(&s->gb, 16); s->reset = get_bits(&s->gb, 16); if(s->avctx->debug & FF_DEBUG_PICT_INFO) { av_log(s->avctx, AV_LOG_DEBUG, "Coding parameters maxval:%d T1:%d T2:%d T3:%d reset:%d\n", s->maxval, s->t1, s->t2, s->t3, s->reset); } // ff_jpegls_reset_coding_parameters(s, 0); //FIXME quant table? break; case 2: s->palette_index = 0; case 3: tid= get_bits(&s->gb, 8); wt = get_bits(&s->gb, 8); if (len < 5) return AVERROR_INVALIDDATA; if (wt < 1 || wt > MAX_COMPONENTS) { avpriv_request_sample(s->avctx, "wt %d", wt); return AVERROR_PATCHWELCOME; } if (!s->maxval) maxtab = 255; else if ((5 + wt*(s->maxval+1)) < 65535) maxtab = s->maxval; else maxtab = 65530/wt - 1; if(s->avctx->debug & FF_DEBUG_PICT_INFO) { av_log(s->avctx, AV_LOG_DEBUG, "LSE palette %d tid:%d wt:%d maxtab:%d\n", id, tid, wt, maxtab); } if (maxtab >= 256) { avpriv_request_sample(s->avctx, ">8bit palette"); return AVERROR_PATCHWELCOME; } maxtab = FFMIN(maxtab, (len - 5) / wt + s->palette_index); if (s->palette_index > maxtab) return AVERROR_INVALIDDATA; if ((s->avctx->pix_fmt == AV_PIX_FMT_GRAY8 || s->avctx->pix_fmt == AV_PIX_FMT_PAL8) && (s->picture_ptr->format == AV_PIX_FMT_GRAY8 || s->picture_ptr->format == AV_PIX_FMT_PAL8)) { uint32_t *pal = (uint32_t *)s->picture_ptr->data[1]; int shift = 0; if (s->avctx->bits_per_raw_sample > 0 && s->avctx->bits_per_raw_sample < 8) { maxtab = FFMIN(maxtab, (1<<s->avctx->bits_per_raw_sample)-1); shift = 8 - s->avctx->bits_per_raw_sample; } s->picture_ptr->format = s->avctx->pix_fmt = AV_PIX_FMT_PAL8; for (i=s->palette_index; i<=maxtab; i++) { uint8_t k = i << shift; pal[k] = 0; for (j=0; j<wt; j++) { pal[k] |= get_bits(&s->gb, 8) << (8*(wt-j-1)); } } s->palette_index = i; } break; case 4: avpriv_request_sample(s->avctx, "oversize image"); return AVERROR(ENOSYS); default: av_log(s->avctx, AV_LOG_ERROR, "invalid id %d\n", id); return AVERROR_INVALIDDATA; } ff_dlog(s->avctx, "ID=%i, T=%i,%i,%i\n", id, s->t1, s->t2, s->t3); return 0; } /** * Get context-dependent Golomb code, decode it and update context */ static inline int ls_get_code_regular(GetBitContext *gb, JLSState *state, int Q) { int k, ret; for (k = 0; (state->N[Q] << k) < state->A[Q]; k++) ; #ifdef JLS_BROKEN if (!show_bits_long(gb, 32)) return -1; #endif ret = get_ur_golomb_jpegls(gb, k, state->limit, state->qbpp); /* decode mapped error */ if (ret & 1) ret = -(ret + 1 >> 1); else ret >>= 1; /* for NEAR=0, k=0 and 2*B[Q] <= - N[Q] mapping is reversed */ if (!state->near && !k && (2 * state->B[Q] <= -state->N[Q])) ret = -(ret + 1); ret = ff_jpegls_update_state_regular(state, Q, ret); return ret; } /** * Get Golomb code, decode it and update state for run termination */ static inline int ls_get_code_runterm(GetBitContext *gb, JLSState *state, int RItype, int limit_add) { int k, ret, temp, map; int Q = 365 + RItype; temp = state->A[Q]; if (RItype) temp += state->N[Q] >> 1; for (k = 0; (state->N[Q] << k) < temp; k++) ; #ifdef JLS_BROKEN if (!show_bits_long(gb, 32)) return -1; #endif ret = get_ur_golomb_jpegls(gb, k, state->limit - limit_add - 1, state->qbpp); /* decode mapped error */ map = 0; if (!k && (RItype || ret) && (2 * state->B[Q] < state->N[Q])) map = 1; ret += RItype + map; if (ret & 1) { ret = map - (ret + 1 >> 1); state->B[Q]++; } else { ret = ret >> 1; } if(FFABS(ret) > 0xFFFF) return -0x10000; /* update state */ state->A[Q] += FFABS(ret) - RItype; ret *= state->twonear; ff_jpegls_downscale_state(state, Q); return ret; } /** * Decode one line of image */ static inline void ls_decode_line(JLSState *state, MJpegDecodeContext *s, void *last, void *dst, int last2, int w, int stride, int comp, int bits) { int i, x = 0; int Ra, Rb, Rc, Rd; int D0, D1, D2; while (x < w) { int err, pred; /* compute gradients */ Ra = x ? R(dst, 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 r; int RItype; /* decode full runs while available */ while (get_bits1(&s->gb)) { int r; r = 1 << ff_log2_run[state->run_index[comp]]; if (x + r * stride > w) r = (w - x) / stride; for (i = 0; i < r; i++) { W(dst, x, Ra); x += stride; } /* if EOL reached, we stop decoding */ if (r != 1 << ff_log2_run[state->run_index[comp]]) return; if (state->run_index[comp] < 31) state->run_index[comp]++; if (x + stride > w) return; } /* decode aborted run */ r = ff_log2_run[state->run_index[comp]]; if (r) r = get_bits_long(&s->gb, r); if (x + r * stride > w) { r = (w - x) / stride; } for (i = 0; i < r; i++) { W(dst, x, Ra); x += stride; } if (x >= w) { av_log(NULL, AV_LOG_ERROR, "run overflow\n"); av_assert0(x <= w); return; } /* decode run termination value */ Rb = R(last, x); RItype = (FFABS(Ra - Rb) <= state->near) ? 1 : 0; err = ls_get_code_runterm(&s->gb, state, RItype, ff_log2_run[state->run_index[comp]]); if (state->run_index[comp]) state->run_index[comp]--; if (state->near && RItype) { pred = Ra + err; } else { if (Rb < Ra) pred = Rb - err; else pred = Rb + err; } } else { /* regular mode */ int context, sign; 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; } else { sign = 0; } if (sign) { pred = av_clip(pred - state->C[context], 0, state->maxval); err = -ls_get_code_regular(&s->gb, state, context); } else { pred = av_clip(pred + state->C[context], 0, state->maxval); err = ls_get_code_regular(&s->gb, state, context); } /* we have to do something more for near-lossless coding */ pred += err; } if (state->near) { if (pred < -state->near) pred += state->range * state->twonear; else if (pred > state->maxval + state->near) pred -= state->range * state->twonear; pred = av_clip(pred, 0, state->maxval); } pred &= state->maxval; W(dst, x, pred); x += stride; } } int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near, int point_transform, int ilv) { int i, t = 0; uint8_t *zero, *last, *cur; JLSState *state; int off = 0, stride = 1, width, shift, ret = 0; zero = av_mallocz(s->picture_ptr->linesize[0]); if (!zero) return AVERROR(ENOMEM); last = zero; cur = s->picture_ptr->data[0]; state = av_mallocz(sizeof(JLSState)); if (!state) { av_free(zero); return AVERROR(ENOMEM); } /* initialize JPEG-LS state from JPEG parameters */ state->near = near; state->bpp = (s->bits < 2) ? 2 : s->bits; state->maxval = s->maxval; state->T1 = s->t1; state->T2 = s->t2; state->T3 = s->t3; state->reset = s->reset; ff_jpegls_reset_coding_parameters(state, 0); ff_jpegls_init_state(state); if (s->bits <= 8) shift = point_transform + (8 - s->bits); else shift = point_transform + (16 - s->bits); if (s->avctx->debug & FF_DEBUG_PICT_INFO) { av_log(s->avctx, AV_LOG_DEBUG, "JPEG-LS params: %ix%i NEAR=%i MV=%i T(%i,%i,%i) " "RESET=%i, LIMIT=%i, qbpp=%i, RANGE=%i\n", s->width, s->height, state->near, state->maxval, state->T1, state->T2, state->T3, state->reset, state->limit, state->qbpp, state->range); av_log(s->avctx, AV_LOG_DEBUG, "JPEG params: ILV=%i Pt=%i BPP=%i, scan = %i\n", ilv, point_transform, s->bits, s->cur_scan); } if (ilv == 0) { /* separate planes */ if (s->cur_scan > s->nb_components) { ret = AVERROR_INVALIDDATA; goto end; } stride = (s->nb_components > 1) ? 3 : 1; off = av_clip(s->cur_scan - 1, 0, stride - 1); width = s->width * stride; cur += off; for (i = 0; i < s->height; i++) { if (s->bits <= 8) { ls_decode_line(state, s, last, cur, t, width, stride, off, 8); t = last[0]; } else { ls_decode_line(state, s, last, cur, t, width, stride, off, 16); t = *((uint16_t *)last); } last = cur; cur += s->picture_ptr->linesize[0]; if (s->restart_interval && !--s->restart_count) { align_get_bits(&s->gb); skip_bits(&s->gb, 16); /* skip RSTn */ } } } else if (ilv == 1) { /* line interleaving */ int j; int Rc[3] = { 0, 0, 0 }; stride = (s->nb_components > 1) ? 3 : 1; memset(cur, 0, s->picture_ptr->linesize[0]); width = s->width * stride; for (i = 0; i < s->height; i++) { for (j = 0; j < stride; j++) { ls_decode_line(state, s, last + j, cur + j, Rc[j], width, stride, j, 8); Rc[j] = last[j]; if (s->restart_interval && !--s->restart_count) { align_get_bits(&s->gb); skip_bits(&s->gb, 16); /* skip RSTn */ } } last = cur; cur += s->picture_ptr->linesize[0]; } } else if (ilv == 2) { /* sample interleaving */ avpriv_report_missing_feature(s->avctx, "Sample interleaved images"); ret = AVERROR_PATCHWELCOME; goto end; } if (s->xfrm && s->nb_components == 3) { int x, w; w = s->width * s->nb_components; if (s->bits <= 8) { uint8_t *src = s->picture_ptr->data[0]; for (i = 0; i < s->height; i++) { switch(s->xfrm) { case 1: for (x = off; x < w; x += 3) { src[x ] += src[x+1] + 128; src[x+2] += src[x+1] + 128; } break; case 2: for (x = off; x < w; x += 3) { src[x ] += src[x+1] + 128; src[x+2] += ((src[x ] + src[x+1])>>1) + 128; } break; case 3: for (x = off; x < w; x += 3) { int g = src[x+0] - ((src[x+2]+src[x+1])>>2) + 64; src[x+0] = src[x+2] + g + 128; src[x+2] = src[x+1] + g + 128; src[x+1] = g; } break; case 4: for (x = off; x < w; x += 3) { int r = src[x+0] - (( 359 * (src[x+2]-128) + 490) >> 8); int g = src[x+0] - (( 88 * (src[x+1]-128) - 183 * (src[x+2]-128) + 30) >> 8); int b = src[x+0] + ((454 * (src[x+1]-128) + 574) >> 8); src[x+0] = av_clip_uint8(r); src[x+1] = av_clip_uint8(g); src[x+2] = av_clip_uint8(b); } break; } src += s->picture_ptr->linesize[0]; } }else avpriv_report_missing_feature(s->avctx, "16bit xfrm"); } if (shift) { /* we need to do point transform or normalize samples */ int x, w; w = s->width * s->nb_components; if (s->bits <= 8) { uint8_t *src = s->picture_ptr->data[0]; for (i = 0; i < s->height; i++) { for (x = off; x < w; x += stride) src[x] <<= shift; src += s->picture_ptr->linesize[0]; } } else { uint16_t *src = (uint16_t *)s->picture_ptr->data[0]; for (i = 0; i < s->height; i++) { for (x = 0; x < w; x++) src[x] <<= shift; src += s->picture_ptr->linesize[0] / 2; } } } end: av_free(state); av_free(zero); return ret; } AVCodec ff_jpegls_decoder = { .name = "jpegls", .long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_JPEGLS, .priv_data_size = sizeof(MJpegDecodeContext), .init = ff_mjpeg_decode_init, .close = ff_mjpeg_decode_end, .decode = ff_mjpeg_decode_frame, .capabilities = AV_CODEC_CAP_DR1, .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, };