484 lines
14 KiB
C
484 lines
14 KiB
C
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/*
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* JPEG-LS encoder
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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 encoder.
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*/
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#include "avcodec.h"
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#include "get_bits.h"
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#include "put_bits.h"
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#include "golomb.h"
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#include "internal.h"
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#include "mathops.h"
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#include "mjpeg.h"
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#include "mjpegenc.h"
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#include "jpegls.h"
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typedef struct JPEGLSContext {
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AVClass *class;
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int pred;
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} JPEGLSContext;
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/**
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* Encode error from regular symbol
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*/
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static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q,
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int err)
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{
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int k;
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int val;
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int map;
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for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
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;
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map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
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if (err < 0)
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err += state->range;
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if (err >= (state->range + 1 >> 1)) {
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err -= state->range;
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val = 2 * FFABS(err) - 1 - map;
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} else
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val = 2 * err + map;
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set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
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ff_jpegls_update_state_regular(state, Q, err);
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}
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/**
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* Encode error from run termination
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*/
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static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb,
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int RItype, int err, int limit_add)
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{
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int k;
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int val, map;
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int Q = 365 + RItype;
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int temp;
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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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map = 0;
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if (!k && err && (2 * state->B[Q] < state->N[Q]))
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map = 1;
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if (err < 0)
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val = -(2 * err) - 1 - RItype + map;
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else
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val = 2 * err - RItype - map;
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set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
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if (err < 0)
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state->B[Q]++;
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state->A[Q] += (val + 1 - RItype) >> 1;
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ff_jpegls_downscale_state(state, Q);
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}
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/**
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* Encode run value as specified by JPEG-LS standard
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*/
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static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run,
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int comp, int trail)
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{
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while (run >= (1 << ff_log2_run[state->run_index[comp]])) {
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put_bits(pb, 1, 1);
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run -= 1 << ff_log2_run[state->run_index[comp]];
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if (state->run_index[comp] < 31)
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state->run_index[comp]++;
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}
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/* if hit EOL, encode another full run, else encode aborted run */
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if (!trail && run) {
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put_bits(pb, 1, 1);
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} else if (trail) {
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put_bits(pb, 1, 0);
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if (ff_log2_run[state->run_index[comp]])
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put_bits(pb, ff_log2_run[state->run_index[comp]], run);
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}
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}
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/**
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* Encode one line of image
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*/
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static inline void ls_encode_line(JLSState *state, PutBitContext *pb,
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void *last, void *cur, int last2, int w,
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int stride, int comp, int bits)
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{
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int 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, sign;
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/* compute gradients */
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Ra = x ? R(cur, 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 RUNval, RItype, run;
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run = 0;
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RUNval = Ra;
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while (x < w && (FFABS(R(cur, x) - RUNval) <= state->near)) {
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run++;
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W(cur, x, Ra);
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x += stride;
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}
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ls_encode_run(state, pb, run, comp, x < w);
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if (x >= w)
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return;
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Rb = R(last, x);
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RItype = FFABS(Ra - Rb) <= state->near;
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pred = RItype ? Ra : Rb;
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err = R(cur, x) - pred;
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if (!RItype && Ra > Rb)
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err = -err;
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if (state->near) {
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if (err > 0)
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err = (state->near + err) / state->twonear;
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else
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err = -(state->near - err) / state->twonear;
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if (RItype || (Rb >= Ra))
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Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
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else
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Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
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W(cur, x, Ra);
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}
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if (err < 0)
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err += state->range;
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if (err >= state->range + 1 >> 1)
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err -= state->range;
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ls_encode_runterm(state, pb, RItype, err,
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ff_log2_run[state->run_index[comp]]);
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if (state->run_index[comp] > 0)
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state->run_index[comp]--;
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} else { /* regular mode */
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int context;
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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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pred = av_clip(pred - state->C[context], 0, state->maxval);
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err = pred - R(cur, x);
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} else {
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sign = 0;
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pred = av_clip(pred + state->C[context], 0, state->maxval);
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err = R(cur, x) - pred;
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}
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if (state->near) {
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if (err > 0)
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err = (state->near + err) / state->twonear;
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else
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err = -(state->near - err) / state->twonear;
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if (!sign)
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Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
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else
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Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
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W(cur, x, Ra);
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}
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ls_encode_regular(state, pb, context, err);
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}
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x += stride;
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}
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}
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static void ls_store_lse(JLSState *state, PutBitContext *pb)
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{
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/* Test if we have default params and don't need to store LSE */
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JLSState state2 = { 0 };
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state2.bpp = state->bpp;
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state2.near = state->near;
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ff_jpegls_reset_coding_parameters(&state2, 1);
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if (state->T1 == state2.T1 &&
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state->T2 == state2.T2 &&
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state->T3 == state2.T3 &&
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state->reset == state2.reset)
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return;
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/* store LSE type 1 */
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put_marker(pb, LSE);
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put_bits(pb, 16, 13);
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put_bits(pb, 8, 1);
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put_bits(pb, 16, state->maxval);
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put_bits(pb, 16, state->T1);
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put_bits(pb, 16, state->T2);
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put_bits(pb, 16, state->T3);
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put_bits(pb, 16, state->reset);
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}
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static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *pict, int *got_packet)
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{
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JPEGLSContext *ctx = avctx->priv_data;
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const AVFrame *const p = pict;
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PutBitContext pb, pb2;
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GetBitContext gb;
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uint8_t *buf2 = NULL;
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uint8_t *zero = NULL;
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uint8_t *cur = NULL;
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uint8_t *last = NULL;
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JLSState *state = NULL;
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int i, size, ret;
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int comps;
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#if FF_API_PRIVATE_OPT
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FF_DISABLE_DEPRECATION_WARNINGS
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if (avctx->prediction_method)
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ctx->pred = avctx->prediction_method;
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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if (avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
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avctx->pix_fmt == AV_PIX_FMT_GRAY16)
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comps = 1;
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else
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comps = 3;
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if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width *avctx->height * comps * 4 +
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AV_INPUT_BUFFER_MIN_SIZE, 0)) < 0)
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return ret;
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buf2 = av_malloc(pkt->size);
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if (!buf2)
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goto memfail;
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init_put_bits(&pb, pkt->data, pkt->size);
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init_put_bits(&pb2, buf2, pkt->size);
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/* write our own JPEG header, can't use mjpeg_picture_header */
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put_marker(&pb, SOI);
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put_marker(&pb, SOF48);
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put_bits(&pb, 16, 8 + comps * 3); // header size depends on components
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put_bits(&pb, 8, (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8); // bpp
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put_bits(&pb, 16, avctx->height);
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put_bits(&pb, 16, avctx->width);
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put_bits(&pb, 8, comps); // components
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for (i = 1; i <= comps; i++) {
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put_bits(&pb, 8, i); // component ID
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put_bits(&pb, 8, 0x11); // subsampling: none
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put_bits(&pb, 8, 0); // Tiq, used by JPEG-LS ext
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}
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put_marker(&pb, SOS);
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put_bits(&pb, 16, 6 + comps * 2);
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put_bits(&pb, 8, comps);
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for (i = 1; i <= comps; i++) {
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put_bits(&pb, 8, i); // component ID
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put_bits(&pb, 8, 0); // mapping index: none
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}
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put_bits(&pb, 8, ctx->pred);
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put_bits(&pb, 8, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
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put_bits(&pb, 8, 0); // point transform: none
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state = av_mallocz(sizeof(JLSState));
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if (!state)
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goto memfail;
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/* initialize JPEG-LS state from JPEG parameters */
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state->near = ctx->pred;
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state->bpp = (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8;
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ff_jpegls_reset_coding_parameters(state, 0);
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ff_jpegls_init_state(state);
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ls_store_lse(state, &pb);
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zero = last = av_mallocz(FFABS(p->linesize[0]));
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if (!zero)
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goto memfail;
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cur = p->data[0];
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if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
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int t = 0;
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for (i = 0; i < avctx->height; i++) {
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ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 8);
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t = last[0];
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last = cur;
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cur += p->linesize[0];
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}
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} else if (avctx->pix_fmt == AV_PIX_FMT_GRAY16) {
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int t = 0;
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for (i = 0; i < avctx->height; i++) {
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ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
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t = *((uint16_t *)last);
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last = cur;
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cur += p->linesize[0];
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}
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} else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
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int j, width;
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int Rc[3] = { 0, 0, 0 };
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width = avctx->width * 3;
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for (i = 0; i < avctx->height; i++) {
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for (j = 0; j < 3; j++) {
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|
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ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
|
||
|
|
width, 3, j, 8);
|
||
|
|
Rc[j] = last[j];
|
||
|
|
}
|
||
|
|
last = cur;
|
||
|
|
cur += p->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 += p->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_freep(&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;
|
||
|
|
|
||
|
|
memfail:
|
||
|
|
av_packet_unref(pkt);
|
||
|
|
av_freep(&buf2);
|
||
|
|
av_freep(&state);
|
||
|
|
av_freep(&zero);
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
}
|
||
|
|
|
||
|
|
static av_cold int encode_init_ls(AVCodecContext *ctx)
|
||
|
|
{
|
||
|
|
#if FF_API_CODED_FRAME
|
||
|
|
FF_DISABLE_DEPRECATION_WARNINGS
|
||
|
|
ctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
|
||
|
|
ctx->coded_frame->key_frame = 1;
|
||
|
|
FF_ENABLE_DEPRECATION_WARNINGS
|
||
|
|
#endif
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define OFFSET(x) offsetof(JPEGLSContext, x)
|
||
|
|
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
|
||
|
|
static const AVOption options[] = {
|
||
|
|
{ "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, VE, "pred" },
|
||
|
|
{ "left", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, VE, "pred" },
|
||
|
|
{ "plane", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
|
||
|
|
{ "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "pred" },
|
||
|
|
|
||
|
|
{ NULL},
|
||
|
|
};
|
||
|
|
|
||
|
|
static const AVClass jpegls_class = {
|
||
|
|
.class_name = "jpegls",
|
||
|
|
.item_name = av_default_item_name,
|
||
|
|
.option = options,
|
||
|
|
.version = LIBAVUTIL_VERSION_INT,
|
||
|
|
};
|
||
|
|
|
||
|
|
AVCodec ff_jpegls_encoder = {
|
||
|
|
.name = "jpegls",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"),
|
||
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
||
|
|
.id = AV_CODEC_ID_JPEGLS,
|
||
|
|
.priv_data_size = sizeof(JPEGLSContext),
|
||
|
|
.priv_class = &jpegls_class,
|
||
|
|
.init = encode_init_ls,
|
||
|
|
.capabilities = AV_CODEC_CAP_FRAME_THREADS,
|
||
|
|
.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
|
||
|
|
},
|
||
|
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
|
||
|
|
FF_CODEC_CAP_INIT_CLEANUP,
|
||
|
|
};
|