forked from KolibriOS/kolibrios
455 lines
14 KiB
C
455 lines
14 KiB
C
/*
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* JPEG-LS decoder
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* Copyright (c) 2003 Michael Niedermayer
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* Copyright (c) 2006 Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* JPEG-LS decoder.
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*/
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#include "avcodec.h"
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#include "get_bits.h"
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#include "golomb.h"
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#include "mathops.h"
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#include "mjpeg.h"
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#include "mjpegdec.h"
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#include "jpegls.h"
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#include "jpeglsdec.h"
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/*
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* Uncomment this to significantly speed up decoding of broken JPEG-LS
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* (or test broken JPEG-LS decoder) and slow down ordinary decoding a bit.
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*
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* There is no Golomb code with length >= 32 bits possible, so check and
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* avoid situation of 32 zeros, FFmpeg Golomb decoder is painfully slow
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* on this errors.
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*/
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//#define JLS_BROKEN
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/**
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* Decode LSE block with initialization parameters
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*/
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int ff_jpegls_decode_lse(MJpegDecodeContext *s)
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{
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int id;
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skip_bits(&s->gb, 16); /* length: FIXME: verify field validity */
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id = get_bits(&s->gb, 8);
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switch (id) {
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case 1:
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s->maxval = get_bits(&s->gb, 16);
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s->t1 = get_bits(&s->gb, 16);
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s->t2 = get_bits(&s->gb, 16);
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s->t3 = get_bits(&s->gb, 16);
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s->reset = get_bits(&s->gb, 16);
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// ff_jpegls_reset_coding_parameters(s, 0);
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//FIXME quant table?
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break;
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case 2:
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case 3:
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av_log(s->avctx, AV_LOG_ERROR, "palette not supported\n");
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return AVERROR(ENOSYS);
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case 4:
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av_log(s->avctx, AV_LOG_ERROR, "oversize image not supported\n");
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return AVERROR(ENOSYS);
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default:
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av_log(s->avctx, AV_LOG_ERROR, "invalid id %d\n", id);
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return AVERROR_INVALIDDATA;
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}
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av_dlog(s->avctx, "ID=%i, T=%i,%i,%i\n", id, s->t1, s->t2, s->t3);
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return 0;
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}
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/**
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* Get context-dependent Golomb code, decode it and update context
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*/
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static inline int ls_get_code_regular(GetBitContext *gb, JLSState *state, int Q)
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{
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int k, ret;
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for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
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;
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#ifdef JLS_BROKEN
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if (!show_bits_long(gb, 32))
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return -1;
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#endif
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ret = get_ur_golomb_jpegls(gb, k, state->limit, state->qbpp);
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/* decode mapped error */
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if (ret & 1)
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ret = -(ret + 1 >> 1);
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else
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ret >>= 1;
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/* for NEAR=0, k=0 and 2*B[Q] <= - N[Q] mapping is reversed */
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if (!state->near && !k && (2 * state->B[Q] <= -state->N[Q]))
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ret = -(ret + 1);
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ret = ff_jpegls_update_state_regular(state, Q, ret);
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return ret;
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}
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/**
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* Get Golomb code, decode it and update state for run termination
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*/
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static inline int ls_get_code_runterm(GetBitContext *gb, JLSState *state,
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int RItype, int limit_add)
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{
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int k, ret, temp, map;
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int Q = 365 + RItype;
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temp = state->A[Q];
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if (RItype)
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temp += state->N[Q] >> 1;
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for (k = 0; (state->N[Q] << k) < temp; k++)
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;
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#ifdef JLS_BROKEN
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if (!show_bits_long(gb, 32))
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return -1;
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#endif
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ret = get_ur_golomb_jpegls(gb, k, state->limit - limit_add - 1,
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state->qbpp);
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/* decode mapped error */
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map = 0;
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if (!k && (RItype || ret) && (2 * state->B[Q] < state->N[Q]))
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map = 1;
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ret += RItype + map;
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if (ret & 1) {
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ret = map - (ret + 1 >> 1);
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state->B[Q]++;
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} else {
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ret = ret >> 1;
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}
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if(FFABS(ret) > 0xFFFF)
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return -0x10000;
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/* update state */
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state->A[Q] += FFABS(ret) - RItype;
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ret *= state->twonear;
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ff_jpegls_downscale_state(state, Q);
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return ret;
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}
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/**
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* Decode one line of image
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*/
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static inline void ls_decode_line(JLSState *state, MJpegDecodeContext *s,
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void *last, void *dst, int last2, int w,
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int stride, int comp, int bits)
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{
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int i, x = 0;
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int Ra, Rb, Rc, Rd;
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int D0, D1, D2;
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while (x < w) {
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int err, pred;
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/* compute gradients */
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Ra = x ? R(dst, x - stride) : R(last, x);
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Rb = R(last, x);
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Rc = x ? R(last, x - stride) : last2;
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Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
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D0 = Rd - Rb;
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D1 = Rb - Rc;
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D2 = Rc - Ra;
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/* run mode */
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if ((FFABS(D0) <= state->near) &&
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(FFABS(D1) <= state->near) &&
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(FFABS(D2) <= state->near)) {
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int r;
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int RItype;
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/* decode full runs while available */
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while (get_bits1(&s->gb)) {
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int r;
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r = 1 << ff_log2_run[state->run_index[comp]];
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if (x + r * stride > w)
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r = (w - x) / stride;
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for (i = 0; i < r; i++) {
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W(dst, x, Ra);
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x += stride;
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}
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/* if EOL reached, we stop decoding */
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if (r != 1 << ff_log2_run[state->run_index[comp]])
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return;
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if (state->run_index[comp] < 31)
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state->run_index[comp]++;
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if (x + stride > w)
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return;
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}
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/* decode aborted run */
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r = ff_log2_run[state->run_index[comp]];
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if (r)
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r = get_bits_long(&s->gb, r);
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if (x + r * stride > w) {
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r = (w - x) / stride;
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}
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for (i = 0; i < r; i++) {
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W(dst, x, Ra);
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x += stride;
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}
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/* decode run termination value */
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Rb = R(last, x);
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RItype = (FFABS(Ra - Rb) <= state->near) ? 1 : 0;
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err = ls_get_code_runterm(&s->gb, state, RItype,
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ff_log2_run[state->run_index[comp]]);
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if (state->run_index[comp])
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state->run_index[comp]--;
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if (state->near && RItype) {
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pred = Ra + err;
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} else {
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if (Rb < Ra)
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pred = Rb - err;
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else
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pred = Rb + err;
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}
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} else { /* regular mode */
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int context, sign;
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context = ff_jpegls_quantize(state, D0) * 81 +
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ff_jpegls_quantize(state, D1) * 9 +
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ff_jpegls_quantize(state, D2);
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pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
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if (context < 0) {
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context = -context;
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sign = 1;
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} else {
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sign = 0;
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}
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if (sign) {
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pred = av_clip(pred - state->C[context], 0, state->maxval);
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err = -ls_get_code_regular(&s->gb, state, context);
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} else {
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pred = av_clip(pred + state->C[context], 0, state->maxval);
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err = ls_get_code_regular(&s->gb, state, context);
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}
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/* we have to do something more for near-lossless coding */
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pred += err;
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}
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if (state->near) {
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if (pred < -state->near)
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pred += state->range * state->twonear;
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else if (pred > state->maxval + state->near)
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pred -= state->range * state->twonear;
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pred = av_clip(pred, 0, state->maxval);
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}
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pred &= state->maxval;
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W(dst, x, pred);
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x += stride;
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}
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}
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int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near,
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int point_transform, int ilv)
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{
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int i, t = 0;
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uint8_t *zero, *last, *cur;
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JLSState *state;
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int off = 0, stride = 1, width, shift, ret = 0;
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zero = av_mallocz(s->picture.linesize[0]);
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last = zero;
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cur = s->picture.data[0];
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state = av_mallocz(sizeof(JLSState));
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/* initialize JPEG-LS state from JPEG parameters */
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state->near = near;
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state->bpp = (s->bits < 2) ? 2 : s->bits;
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state->maxval = s->maxval;
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state->T1 = s->t1;
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state->T2 = s->t2;
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state->T3 = s->t3;
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state->reset = s->reset;
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ff_jpegls_reset_coding_parameters(state, 0);
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ff_jpegls_init_state(state);
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if (s->bits <= 8)
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shift = point_transform + (8 - s->bits);
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else
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shift = point_transform + (16 - s->bits);
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if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
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av_log(s->avctx, AV_LOG_DEBUG,
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"JPEG-LS params: %ix%i NEAR=%i MV=%i T(%i,%i,%i) "
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"RESET=%i, LIMIT=%i, qbpp=%i, RANGE=%i\n",
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s->width, s->height, state->near, state->maxval,
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state->T1, state->T2, state->T3,
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state->reset, state->limit, state->qbpp, state->range);
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av_log(s->avctx, AV_LOG_DEBUG, "JPEG params: ILV=%i Pt=%i BPP=%i, scan = %i\n",
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ilv, point_transform, s->bits, s->cur_scan);
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}
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if (ilv == 0) { /* separate planes */
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if (s->cur_scan > s->nb_components) {
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ret = AVERROR_INVALIDDATA;
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goto end;
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}
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stride = (s->nb_components > 1) ? 3 : 1;
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off = av_clip(s->cur_scan - 1, 0, stride - 1);
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width = s->width * stride;
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cur += off;
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for (i = 0; i < s->height; i++) {
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if (s->bits <= 8) {
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ls_decode_line(state, s, last, cur, t, width, stride, off, 8);
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t = last[0];
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} else {
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ls_decode_line(state, s, last, cur, t, width, stride, off, 16);
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t = *((uint16_t *)last);
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}
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last = cur;
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cur += s->picture.linesize[0];
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if (s->restart_interval && !--s->restart_count) {
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align_get_bits(&s->gb);
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skip_bits(&s->gb, 16); /* skip RSTn */
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}
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}
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} else if (ilv == 1) { /* line interleaving */
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int j;
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int Rc[3] = { 0, 0, 0 };
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stride = (s->nb_components > 1) ? 3 : 1;
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memset(cur, 0, s->picture.linesize[0]);
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width = s->width * stride;
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for (i = 0; i < s->height; i++) {
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for (j = 0; j < stride; j++) {
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ls_decode_line(state, s, last + j, cur + j,
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Rc[j], width, stride, j, 8);
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Rc[j] = last[j];
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if (s->restart_interval && !--s->restart_count) {
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align_get_bits(&s->gb);
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skip_bits(&s->gb, 16); /* skip RSTn */
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}
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}
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last = cur;
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cur += s->picture.linesize[0];
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}
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} else if (ilv == 2) { /* sample interleaving */
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avpriv_report_missing_feature(s->avctx, "Sample interleaved images");
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ret = AVERROR_PATCHWELCOME;
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goto end;
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}
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if (s->xfrm && s->nb_components == 3) {
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int x, w;
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w = s->width * s->nb_components;
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if (s->bits <= 8) {
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uint8_t *src = s->picture.data[0];
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for (i = 0; i < s->height; i++) {
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switch(s->xfrm) {
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case 1:
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for (x = off; x < w; x += 3) {
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src[x ] += src[x+1] + 128;
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src[x+2] += src[x+1] + 128;
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}
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break;
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case 2:
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for (x = off; x < w; x += 3) {
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src[x ] += src[x+1] + 128;
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src[x+2] += ((src[x ] + src[x+1])>>1) + 128;
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}
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break;
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case 3:
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for (x = off; x < w; x += 3) {
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int g = src[x+0] - ((src[x+2]+src[x+1])>>2) + 64;
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src[x+0] = src[x+2] + g + 128;
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src[x+2] = src[x+1] + g + 128;
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src[x+1] = g;
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}
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break;
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case 4:
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for (x = off; x < w; x += 3) {
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int r = src[x+0] - (( 359 * (src[x+2]-128) + 490) >> 8);
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int g = src[x+0] - (( 88 * (src[x+1]-128) - 183 * (src[x+2]-128) + 30) >> 8);
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int b = src[x+0] + ((454 * (src[x+1]-128) + 574) >> 8);
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src[x+0] = av_clip_uint8(r);
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src[x+1] = av_clip_uint8(g);
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src[x+2] = av_clip_uint8(b);
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}
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break;
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}
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src += s->picture.linesize[0];
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}
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}else
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avpriv_report_missing_feature(s->avctx, "16bit xfrm");
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}
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if (shift) { /* we need to do point transform or normalize samples */
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int x, w;
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w = s->width * s->nb_components;
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if (s->bits <= 8) {
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uint8_t *src = s->picture.data[0];
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for (i = 0; i < s->height; i++) {
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for (x = off; x < w; x += stride)
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src[x] <<= shift;
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src += s->picture.linesize[0];
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}
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} else {
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uint16_t *src = (uint16_t *)s->picture.data[0];
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for (i = 0; i < s->height; i++) {
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for (x = 0; x < w; x++)
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src[x] <<= shift;
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src += s->picture.linesize[0] / 2;
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}
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}
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}
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end:
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av_free(state);
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av_free(zero);
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return ret;
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}
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AVCodec ff_jpegls_decoder = {
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.name = "jpegls",
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.long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_JPEGLS,
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.priv_data_size = sizeof(MJpegDecodeContext),
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.init = ff_mjpeg_decode_init,
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.close = ff_mjpeg_decode_end,
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.decode = ff_mjpeg_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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};
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