/*
* 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 "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;
skip_bits(&s->gb, 16); /* length: FIXME: verify field validity */
id = get_bits(&s->gb, 8);
switch (id) {
case 1:
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);
// ff_jpegls_reset_coding_parameters(s, 0);
//FIXME quant table?
break;
case 2:
case 3:
av_log(s->avctx, AV_LOG_ERROR, "palette not supported\n");
return AVERROR(ENOSYS);
case 4:
av_log(s->avctx, AV_LOG_ERROR, "oversize image not supported\n");
return AVERROR(ENOSYS);
default:
av_log(s->avctx, AV_LOG_ERROR, "invalid id %d\n", id);
return AVERROR_INVALIDDATA;
}
av_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;
}
/* 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]);
last = zero;
cur = s->picture_ptr->data[0];
state = av_mallocz(sizeof(JLSState));
/* 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 = CODEC_CAP_DR1,
};