[FFmpeg-devel] [PATCH 2/2] avcodec/jpeg2000dec: Add support for HTJ2K decoding
etemesicaleb at gmail.com
etemesicaleb at gmail.com
Wed Dec 28 22:20:47 EET 2022
From: caleb <etemesicaleb at gmail.com>
---
libavcodec/Makefile | 2 +-
libavcodec/jpeg2000.h | 3 +
libavcodec/jpeg2000dec.c | 69 +-
libavcodec/jpeg2000htdec.c | 1425 ++++++++++++++++++++++++++++++++++++
libavcodec/jpeg2000htdec.h | 28 +
5 files changed, 1511 insertions(+), 16 deletions(-)
create mode 100644 libavcodec/jpeg2000htdec.c
create mode 100644 libavcodec/jpeg2000htdec.h
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 98841ed07c..1ba9e09528 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -464,7 +464,7 @@ OBJS-$(CONFIG_JACOSUB_DECODER) += jacosubdec.o ass.o
OBJS-$(CONFIG_JPEG2000_ENCODER) += j2kenc.o mqcenc.o mqc.o jpeg2000.o \
jpeg2000dwt.o
OBJS-$(CONFIG_JPEG2000_DECODER) += jpeg2000dec.o jpeg2000.o jpeg2000dsp.o \
- jpeg2000dwt.o mqcdec.o mqc.o
+ jpeg2000dwt.o mqcdec.o mqc.o jpeg2000htdec.o
OBJS-$(CONFIG_JPEGLS_DECODER) += jpeglsdec.o jpegls.o
OBJS-$(CONFIG_JPEGLS_ENCODER) += jpeglsenc.o jpegls.o
OBJS-$(CONFIG_JV_DECODER) += jvdec.o
diff --git a/libavcodec/jpeg2000.h b/libavcodec/jpeg2000.h
index e5ecb4cbf9..b2a8e13244 100644
--- a/libavcodec/jpeg2000.h
+++ b/libavcodec/jpeg2000.h
@@ -189,6 +189,9 @@ typedef struct Jpeg2000Cblk {
Jpeg2000Pass *passes;
Jpeg2000Layer *layers;
int coord[2][2]; // border coordinates {{x0, x1}, {y0, y1}}
+ /*HTJ2K settings */
+ int zbp;
+ int pass_lengths[2];
} Jpeg2000Cblk; // code block
typedef struct Jpeg2000Prec {
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index 5994e29ae3..0863727420 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -43,6 +43,7 @@
#include "jpeg2000dsp.h"
#include "profiles.h"
#include "jpeg2000dec.h"
+#include "jpeg2000htdec.h"
#define JP2_SIG_TYPE 0x6A502020
#define JP2_SIG_VALUE 0x0D0A870A
@@ -436,12 +437,13 @@ static int get_cox(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c)
c->cblk_style = bytestream2_get_byteu(&s->g);
if (c->cblk_style != 0) { // cblk style
if (c->cblk_style & JPEG2000_CTSY_HTJ2K_M || c->cblk_style & JPEG2000_CTSY_HTJ2K_F) {
- av_log(s->avctx, AV_LOG_ERROR, "Support for High throughput JPEG 2000 is not yet available\n");
- return AVERROR_PATCHWELCOME;
+ av_log(s->avctx,AV_LOG_TRACE,"High Throughput jpeg 2000 codestream.\n");
+ s->is_htj2k = 1;
+ } else {
+ av_log(s->avctx, AV_LOG_WARNING, "extra cblk styles %X\n", c->cblk_style);
+ if (c->cblk_style & JPEG2000_CBLK_BYPASS)
+ av_log(s->avctx, AV_LOG_WARNING, "Selective arithmetic coding bypass\n");
}
- av_log(s->avctx, AV_LOG_WARNING, "extra cblk styles %X\n", c->cblk_style);
- if (c->cblk_style & JPEG2000_CBLK_BYPASS)
- av_log(s->avctx, AV_LOG_WARNING, "Selective arithmetic coding bypass\n");
}
c->transform = bytestream2_get_byteu(&s->g); // DWT transformation type
/* set integer 9/7 DWT in case of BITEXACT flag */
@@ -1066,13 +1068,15 @@ static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
return incl;
if (!cblk->npasses) {
- int v = expn[bandno] + numgbits - 1 -
- tag_tree_decode(s, prec->zerobits + cblkno, 100);
+ int zbp = tag_tree_decode(s,prec->zerobits + cblkno, 100);
+ int v = expn[bandno] + numgbits - 1 - zbp;
+
if (v < 0 || v > 30) {
av_log(s->avctx, AV_LOG_ERROR,
"nonzerobits %d invalid or unsupported\n", v);
return AVERROR_INVALIDDATA;
}
+ cblk->zbp = zbp;
cblk->nonzerobits = v;
}
if ((newpasses = getnpasses(s)) < 0)
@@ -1113,8 +1117,29 @@ static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
}
}
- if ((ret = get_bits(s, av_log2(newpasses1) + cblk->lblock)) < 0)
- return ret;
+ if (newpasses > 1 && s->is_htj2k) {
+ // Retrieve pass lengths for each pass
+ int href_passes = (cblk->npasses + newpasses - 1) % 3;
+ int segment_passes = newpasses - href_passes;
+ int pass_bound = 2;
+ int eb = 0;
+ int extra_bit = newpasses > 2 ? 1 : 0;
+ while (pass_bound <=segment_passes) {
+ eb++;
+ pass_bound +=pass_bound;
+ }
+ if ((ret = get_bits(s, llen + eb + 3)) < 0)
+ return ret;
+ cblk->pass_lengths[0] = ret;
+ if ((ret = get_bits(s, llen + 3 + extra_bit)) < 0)
+ return ret;
+ cblk->pass_lengths[1] = ret;
+ ret = cblk->pass_lengths[0] + cblk->pass_lengths[1];
+ } else {
+ if ((ret = get_bits(s, av_log2(newpasses1) + cblk->lblock)) < 0)
+ return ret;
+ cblk->pass_lengths[0] = ret;
+ }
if (ret > cblk->data_allocated) {
size_t new_size = FFMAX(2*cblk->data_allocated, ret);
void *new = av_realloc(cblk->data, new_size);
@@ -1865,7 +1890,10 @@ static inline void tile_codeblocks(const Jpeg2000DecoderContext *s, Jpeg2000Tile
for (compno = 0; compno < s->ncomponents; compno++) {
Jpeg2000Component *comp = tile->comp + compno;
Jpeg2000CodingStyle *codsty = tile->codsty + compno;
+ Jpeg2000QuantStyle *quantsty= tile->qntsty + compno;
+
int coded = 0;
+ int subbandno = 0;
t1.stride = (1<<codsty->log2_cblk_width) + 2;
@@ -1873,7 +1901,7 @@ static inline void tile_codeblocks(const Jpeg2000DecoderContext *s, Jpeg2000Tile
for (reslevelno = 0; reslevelno < codsty->nreslevels2decode; reslevelno++) {
Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
/* Loop on bands */
- for (bandno = 0; bandno < rlevel->nbands; bandno++) {
+ for (bandno = 0; bandno < rlevel->nbands; bandno++, subbandno++) {
int nb_precincts, precno;
Jpeg2000Band *band = rlevel->band + bandno;
int cblkno = 0, bandpos;
@@ -1893,12 +1921,23 @@ static inline void tile_codeblocks(const Jpeg2000DecoderContext *s, Jpeg2000Tile
for (cblkno = 0;
cblkno < prec->nb_codeblocks_width * prec->nb_codeblocks_height;
cblkno++) {
- int x, y;
+ int x, y, ret;
+ // Annex E (Equation E-2) ISO/IEC 15444-1:2019
+ int magp = quantsty->expn[subbandno] + quantsty->nguardbits - 1;
+
Jpeg2000Cblk *cblk = prec->cblk + cblkno;
- int ret = decode_cblk(s, codsty, &t1, cblk,
- cblk->coord[0][1] - cblk->coord[0][0],
- cblk->coord[1][1] - cblk->coord[1][0],
- bandpos, comp->roi_shift);
+
+ if (s->is_htj2k)
+ ret = ff_jpeg2000_decode_htj2k(s, codsty, &t1, cblk,
+ cblk->coord[0][1] - cblk->coord[0][0],
+ cblk->coord[1][1] - cblk->coord[1][0],
+ magp, comp->roi_shift);
+ else
+ ret = decode_cblk(s, codsty, &t1, cblk,
+ cblk->coord[0][1] - cblk->coord[0][0],
+ cblk->coord[1][1] - cblk->coord[1][0],
+ bandpos, comp->roi_shift);
+
if (ret)
coded = 1;
else
diff --git a/libavcodec/jpeg2000htdec.c b/libavcodec/jpeg2000htdec.c
new file mode 100644
index 0000000000..e7c84fe36d
--- /dev/null
+++ b/libavcodec/jpeg2000htdec.c
@@ -0,0 +1,1425 @@
+/*
+ * Copyright (c) 2022 Caleb Etemesi <etemesicaleb at gmail.com>
+ *
+ * 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
+ */
+#include "jpeg2000htdec.h"
+#include "jpeg2000.h"
+#include "jpeg2000dec.h"
+#include <stdint.h>
+#include <libavutil/attributes.h>
+#include <libavutil/common.h>
+#include <libavutil/avassert.h>
+
+#define J2K_Q1 0
+
+#define J2K_Q2 1
+
+#define HT_SHIFT_SIGMA 0
+#define HT_SHIFT_SCAN 4
+#define HT_SHIFT_REF 3
+#define HT_SHIFT_REF_IND 2
+/**
+ * @brief Table 2 in clause 7.3.3
+ */
+const static uint8_t mel_e[13] = {0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 4, 5};
+// Decode tables, found at the end of this
+static const uint16_t dec_cxt_vlc_table1[1024];
+static const uint16_t dec_cxt_vlc_table0[1024];
+
+typedef struct StateVars {
+ int32_t pos;
+ uint32_t bits;
+ uint32_t tmp;
+ uint32_t last;
+ uint8_t bits_left;
+ uint64_t bit_buf;
+} StateVars;
+
+typedef struct MelDecoderState {
+ uint8_t k;
+ uint8_t run;
+ uint8_t one;
+} MelDecoderState;
+
+/**
+ * Given a precomputed c, checks whether n % d == 0
+ *
+ * precomputed c for d is created by the precompute_c function
+ */
+static av_always_inline uint32_t is_divisible(uint32_t n, uint64_t c)
+{
+ return n * c <= c - 1;
+}
+/**
+ * Precompute a number c given d that when combined with a dividend n
+ * returns whether n % d == 0
+ *
+ * Combined with is_divisible function
+ */
+static av_always_inline uint64_t precompute_c(uint32_t divisor)
+{
+
+ return 1 + (0xfffffffffffffffful / divisor);
+}
+/* Initializers */
+
+static void jpeg2000_init_zero(StateVars *s)
+{
+ s->bits_left = 0;
+ s->bit_buf = 0;
+ s->tmp = 0;
+ s->bits = 0;
+ s->pos = 0;
+ s->last = 0;
+}
+
+static void jpeg2000_init_mel(StateVars *s, uint32_t Pcup)
+{
+ jpeg2000_init_zero(s);
+ s->pos = Pcup;
+}
+
+static void jpeg2000_init_mag_ref(StateVars *s, uint32_t Lref)
+{
+ s->pos = Lref - 2;
+ s->bits = 0;
+ s->last = 0xFF;
+ s->tmp = 0;
+ s->bits_left = 0;
+ s->bit_buf = 0;
+}
+
+static void jpeg2000_init_mel_decoder(MelDecoderState *mel_state)
+{
+ mel_state->k = 0;
+ mel_state->run = 0;
+ mel_state->one = 0;
+}
+
+/**
+ * @brief Refill the buffer backwards in little Endian while skipping
+ * over stuffing bits
+ *
+ * Stuffing bits are those that appear in the position of any byte whose
+ * LSBs are all 1's if the last consumed byte was larger than 0x8F
+ */
+static int jpeg2000_bitbuf_refill_backwards(StateVars *buffer,
+ const uint8_t *array)
+{
+ uint64_t tmp = 0;
+ int32_t position = buffer->pos;
+ uint32_t new_bits = 32;
+
+ if (buffer->bits_left > 32)
+ return 0; // enough data, no need to pull in more bits
+
+ /*
+ * We are reading bytes from end to start, we need
+ * to be careful about how we handle us being close to the end
+ * Subtracting by 4 means we will read some of the bytes of
+ * the MEL byte stream since the MEL byte stream
+ * ends at the start of the VLC byte stream.
+ * This is okay as they are masked away since we check for
+ * cases where that occurs(when the position is less than 4).
+ */
+
+ position -= 4;
+
+ tmp = AV_RB32(&array[position+1]);
+
+ if (buffer->pos < 4){
+ // mask un-needed bits if we are close to input end
+ uint64_t mask = (1ul << (buffer->pos + 1) * 8) - 1;
+ tmp &= mask;
+ }
+
+ // unstuff bits
+ // load temporary byte, which preceeds the position we
+ // currently at, to ensure that we can also un-stuff if the
+ // stuffed bit is the bottom most bits
+ tmp <<= 8;
+ tmp |= array[buffer->pos + 1];
+
+ if ((tmp & 0x7FFF000000) > 0x7F8F000000) {
+ tmp &= 0x7FFFFFFFFF;
+ new_bits--;
+ }
+ if ((tmp & 0x007FFF0000) > 0x007F8F0000) {
+ tmp = (tmp & 0x007FFFFFFF) + ((tmp & 0xFF00000000) >> 1);
+ new_bits--;
+ }
+ if ((tmp & 0x00007FFF00) > 0x00007F8F00) {
+ tmp = (tmp & 0x00007FFFFF) + ((tmp & 0xFFFF000000) >> 1);
+ new_bits--;
+ }
+ if ((tmp & 0x0000007FFF) > 0x0000007F8F) {
+ tmp = (tmp & 0x0000007FFF) + ((tmp & 0xFFFFFF0000) >> 1);
+ new_bits--;
+ }
+ /* remove temporary byte loaded. */
+ tmp >>= 8;
+
+ /* Add bits to the MSB of the bit buffer */
+ buffer->bit_buf |= tmp << buffer->bits_left;
+ buffer->bits_left += new_bits;
+ buffer->pos = FFMAX(0, position);
+ return 0;
+}
+
+/**
+ * @brief Refill the bit-buffer reading new bits going forward
+ * in the stream while skipping over stuffed bits.
+ */
+static void jpeg2000_bitbuf_refill_forward(StateVars *buffer,
+ const uint8_t *array,
+ uint32_t length)
+{
+ while (buffer->bits_left < 32) {
+ buffer->tmp = 0xFF;
+ buffer->bits = (buffer->last == 0xFF) ? 7 : 8;
+ if (buffer->pos <= length) {
+ buffer->tmp = array[buffer->pos];
+ buffer->pos += 1;
+ buffer->last = buffer->tmp;
+ }
+ buffer->bit_buf |= ((uint64_t) buffer->tmp) << buffer->bits_left;
+ buffer->bits_left += buffer->bits;
+ }
+}
+
+/**
+ * @brief Drops bits from lower bits in the bit buffer
+ *
+ * @param buf: Struct containing bit buffers
+ * @param nbits: Number of bits to remove.
+ */
+static av_always_inline void jpeg2000_bitbuf_drop_bits_lsb(StateVars *buf,
+ uint8_t nbits)
+{
+ if (buf->bits_left < nbits) {
+ av_log(NULL, AV_LOG_ERROR, "Invalid bit read of %d, bits in buffer are %d\n", nbits, buf->bits_left);
+ av_assert0(0);
+ }
+ buf->bit_buf >>= nbits;
+ buf->bits_left -= nbits;
+}
+
+/**
+ * @brief Get bits from the bit buffer reading them
+ * from the least significant bits moving to the most significant bits.
+ *
+ * In case there are fewer bits, refill from `buf` moving backwards.
+ */
+static av_always_inline uint64_t jpeg2000_bitbuf_get_bits_lsb(
+ StateVars *bit_stream, uint8_t nbits, const uint8_t *buf)
+{
+ uint64_t bits;
+ uint64_t mask = (1ull << nbits) - 1;
+ if (bit_stream->bits_left < nbits)
+ jpeg2000_bitbuf_refill_backwards(bit_stream, buf);
+ bits = bit_stream->bit_buf & mask;
+ jpeg2000_bitbuf_drop_bits_lsb(bit_stream, nbits);
+ return bits;
+}
+
+/**
+ * @brief Get bits from the bit buffer reading them
+ * from the least significant bits moving to the most significant bits
+ *
+ * In case there are fewer bits, refill from `buf` moving forward
+ */
+static av_always_inline uint64_t jpeg2000_bitbuf_get_bits_lsb_forward(
+ StateVars *bit_stream, uint8_t nbits, const uint8_t *buf, uint32_t length)
+{
+ uint64_t bits;
+ uint64_t mask = (1ull << nbits) - 1;
+
+ if (bit_stream->bits_left <= nbits)
+ jpeg2000_bitbuf_refill_forward(bit_stream, buf, length);
+ bits = bit_stream->bit_buf & mask;
+ jpeg2000_bitbuf_drop_bits_lsb(bit_stream, nbits);
+ return bits;
+}
+
+/**
+ * @brief Look ahead bit buffer without discarding bits
+ */
+static av_always_inline uint64_t jpeg2000_bitbuf_peek_bits_lsb(StateVars *stream, uint8_t nbits)
+{
+ uint64_t mask = (1ull << nbits) - 1;
+ return stream->bit_buf & mask;
+}
+
+/**
+ * Variable Length Decoding Routines
+ */
+static void jpeg2000_init_vlc(StateVars *s, uint32_t Lcup, uint32_t Pcup, const uint8_t *Dcup)
+{
+ s->bits_left = 0;
+ s->bit_buf = 0;
+ s->pos = Lcup - 2 - Pcup;
+ s->last = Dcup[Lcup - 2];
+ s->tmp = (s->last) >> 4;
+ s->bits = ((s->tmp & 7) < 7) ? 4 : 3;
+
+ jpeg2000_bitbuf_refill_backwards(s, Dcup + Pcup);
+ jpeg2000_bitbuf_drop_bits_lsb(s, 4);
+}
+
+/**
+ * Decode prefix codes for VLC segment.
+ */
+static int av_always_inline jpeg2000_decode_ctx_vlc(const Jpeg2000DecoderContext *s,
+ StateVars *vlc_stream,
+ const uint16_t *table,
+ const uint8_t *Dcup,
+ uint8_t *sig_pat,
+ uint8_t *res_off,
+ uint8_t *emb_pat_k,
+ uint8_t *emb_pat_1,
+ uint8_t pos,
+ uint32_t Pcup,
+ uint16_t context)
+{
+ /* Described in clause 7.3.5 */
+ uint32_t value;
+ uint8_t len;
+ uint64_t index;
+ uint64_t code_word;
+
+ jpeg2000_bitbuf_refill_backwards(vlc_stream, Dcup + Pcup);
+
+ code_word = vlc_stream->bit_buf & 0x7f;
+ index = code_word + (context << 7);
+
+ /* decode table has 1024 entries so ensure array access is in bounds */
+ av_assert0(index < 1024);
+
+ value = table[index];
+
+ len = (value & 0x000F) >> 1;
+
+ res_off[pos] = (uint8_t) (value & 1);
+ sig_pat[pos] = (uint8_t) ((value & 0x00F0) >> 4);
+ emb_pat_k[pos] = (uint8_t) ((value & 0x0F00) >> 8);
+ emb_pat_1[pos] = (uint8_t) ((value & 0xF000) >> 12);
+
+ jpeg2000_bitbuf_drop_bits_lsb(vlc_stream, len);
+ return 0;
+}
+
+/**
+ * @brief Decode variable length u-vlc prefix
+ */
+static av_always_inline uint8_t
+vlc_decode_u_prefix(StateVars *vlc_stream, const uint8_t *refill_array)
+{
+ /* clause 7.3.6
+ * procedure : decodeUPrefix.
+ */
+ static const uint8_t return_value[8] = {5, 1, 2, 1, 3, 1, 2, 1};
+ static const uint8_t drop_bits[8] = {3, 1, 2, 1, 3, 1, 2, 1};
+
+ uint8_t bits;
+
+ if (vlc_stream->bits_left < 3)
+ jpeg2000_bitbuf_refill_backwards(vlc_stream, refill_array);
+
+ bits = jpeg2000_bitbuf_peek_bits_lsb(vlc_stream, 3);
+
+ jpeg2000_bitbuf_drop_bits_lsb(vlc_stream, drop_bits[bits]);
+ return return_value[bits];
+}
+
+/**
+ * @brief Decode variable length u-vlc suffix
+ */
+static av_always_inline uint8_t vlc_decode_u_suffix(
+ StateVars *vlc_stream, uint8_t suffix, const uint8_t *refill_array)
+{
+ /* clause 7.3.6
+ * procedure: decodeUSuffix
+ */
+ static const int mask[] = {1, 31};
+ static const int drop_bits[] = {1, 5};
+
+ uint8_t bits;
+ int cond = suffix != 3;
+ if (suffix < 3)
+ return 0;
+
+ if (vlc_stream->bits_left < 5)
+ jpeg2000_bitbuf_refill_backwards(vlc_stream, refill_array);
+
+ bits = jpeg2000_bitbuf_peek_bits_lsb(vlc_stream, 5);
+
+ jpeg2000_bitbuf_drop_bits_lsb(vlc_stream, drop_bits[cond]);
+ return bits & mask[cond];
+}
+
+/**
+ * @brief Decode variable length u-vlc suffix
+ */
+static av_always_inline uint8_t vlc_decode_u_extension(
+ StateVars *vlc_stream, uint8_t suffix, const uint8_t *refill_array)
+{
+ /* clause 7.3.6
+ * procedure decodeUExtension.
+ */
+ return jpeg2000_bitbuf_get_bits_lsb(vlc_stream, 4 * (suffix >= 28), refill_array);
+}
+
+/**
+ * Magnitude and Sign decode procedures
+ */
+static int32_t av_always_inline jpeg2000_decode_mag_sgn(StateVars *mag_sgn_stream, int32_t m_n,
+ int32_t i_n, const uint8_t *buf, uint32_t length)
+{
+ /* clause 7.3.8
+ * procedure: decodeMagSgnValue
+ */
+ int32_t val = 0;
+ if (m_n > 0) {
+ val = jpeg2000_bitbuf_get_bits_lsb_forward(mag_sgn_stream,m_n,buf,length);
+ val += (i_n << m_n);
+ }
+ return val;
+}
+
+static av_always_inline void
+recover_mag_sgn(StateVars *mag_sgn, uint8_t pos, uint16_t q, int32_t m_n[2], int32_t known_1[2],
+ const uint8_t emb_pat_1[2],
+ int32_t v[2][4], int32_t m[2][4], uint8_t *E, uint32_t *mu_n, const uint8_t *Dcup, uint32_t Pcup,
+ uint32_t pLSB)
+{
+ for (int i = 0; i < 4; i++) {
+ int32_t n = 4 * q + i;
+ m_n[pos] = m[pos][i];
+ known_1[pos] = (emb_pat_1[pos] >> i) & 1;
+ v[pos][i] = jpeg2000_decode_mag_sgn(mag_sgn, m_n[pos], known_1[pos], Dcup, Pcup);
+
+ if (m_n[pos] != 0) {
+ E[n] = 32 - ff_clz(v[pos][i] | 1);
+ mu_n[n] = (v[pos][i] >> 1) + 1;
+ mu_n[n] <<= pLSB;
+ mu_n[n] |= ((uint32_t) (v[pos][i] & 1)) << 31; // sign bit.
+ }
+ }
+}
+
+static int jpeg2000_import_bit(StateVars *stream, const uint8_t *array, uint32_t length)
+{
+ int cond = stream->pos <= length;
+ int pos = FFMIN(stream->pos, length);
+ if (stream->bits == 0) {
+ stream->bits = (stream->tmp == 0xFF) ? 7 : 8;
+ stream->pos += cond;
+ stream->tmp = cond ? array[pos] : 0xFF;
+ }
+ stream->bits -= 1;
+ return (stream->tmp >> stream->bits) & 1;
+}
+
+static int jpeg2000_peek_bit(StateVars *stream, const uint8_t *array, uint32_t length)
+{
+ if (stream->bits == 0) {
+ int cond = stream->pos <= length;
+ int pos = FFMIN(stream->pos, length);
+ stream->bits = (stream->tmp == 0xFF) ? 7 : 8;
+ stream->pos += cond;
+ stream->tmp = cond ? array[pos] : 0xFF;
+ }
+ return (stream->tmp >> stream->bits) & 1;
+}
+
+static int jpeg2000_decode_mel_sym(MelDecoderState *mel_state,
+ StateVars *mel_stream,
+ const uint8_t *Dcup,
+ uint32_t Lcup)
+{
+
+ if (mel_state->run == 0 && mel_state->one == 0) {
+ uint8_t eval;
+ uint8_t bit;
+
+ eval = mel_e[mel_state->k];
+ bit = jpeg2000_import_bit(mel_stream, Dcup, Lcup);
+ if (bit == 1) {
+ mel_state->run = 1 << eval;
+ mel_state->k = FFMIN(12, mel_state->k + 1);
+ } else {
+ mel_state->run = 0;
+ while (eval > 0) {
+ bit = jpeg2000_import_bit(mel_stream, Dcup, Lcup);
+ mel_state->run = (2 * (mel_state->run)) + bit;
+ eval -= 1;
+ }
+ mel_state->k = FFMAX(0, mel_state->k - 1);
+ mel_state->one = 1;
+ }
+ }
+ if (mel_state->run > 0) {
+ mel_state->run -= 1;
+ return 0;
+ } else {
+ mel_state->one = 0;
+ return 1;
+ }
+}
+
+/**
+ * @brief Magref decoding procedures
+ */
+static av_always_inline int jpeg2000_import_magref_bit(StateVars *stream, const uint8_t *array, uint32_t length)
+{
+ return jpeg2000_bitbuf_get_bits_lsb(stream, 1, array);
+}
+
+/**
+ * @brief Signal EMB decode
+ */
+static int
+jpeg2000_decode_sig_emb(const Jpeg2000DecoderContext *s, MelDecoderState *mel_state, StateVars *mel_stream,
+ StateVars *vlc_stream, const uint16_t *vlc_table, const uint8_t *Dcup, uint8_t *sig_pat,
+ uint8_t *res_off, uint8_t *emb_pat_k, uint8_t *emb_pat_1, uint8_t pos, uint16_t context,
+ uint32_t Lcup, uint32_t Pcup)
+{
+ if (context == 0) {
+ uint8_t sym;
+ sym = jpeg2000_decode_mel_sym(mel_state, mel_stream, Dcup, Lcup);
+ if (sym == 0) {
+ sig_pat[pos] = 0;
+ res_off[pos] = 0;
+ emb_pat_k[pos] = 0;
+ emb_pat_1[pos] = 0;
+ return 0;
+ }
+ }
+ return jpeg2000_decode_ctx_vlc(s, vlc_stream, vlc_table, Dcup, sig_pat,
+ res_off, emb_pat_k, emb_pat_1, pos, Pcup,
+ context);
+}
+
+static av_always_inline int jpeg2000_get_state(int x1, int x2, int width, int shift_by, const uint8_t *block_states)
+{
+ return (block_states[(x1 + 1) * (width + 2) + (x2 + 1)] >> shift_by) & 1;
+}
+
+static av_always_inline void jpeg2000_modify_state(int x1, int x2, int width, int value, uint8_t *block_states)
+{
+ block_states[(x1 + 1) * (width + 2) + (x2 + 1)] |= value;
+}
+
+static int av_always_inline
+jpeg2000_decode_ht_cleanup_segment(const Jpeg2000DecoderContext *s, Jpeg2000Cblk *cblk, Jpeg2000T1Context *t1,
+ MelDecoderState *mel_state,
+ StateVars *mel_stream, StateVars *vlc_stream, StateVars *mag_sgn_stream, const uint8_t *Dcup,
+ uint32_t Lcup,
+ uint32_t Pcup, uint8_t pLSB, int width, int height, int32_t *sample_buf,
+ uint8_t *block_states)
+{
+ uint16_t q = 0; /* Represents current quad position. */
+ uint16_t q1, q2;
+ uint16_t context1, context2;
+ uint16_t context = 0;
+
+ uint8_t sig_pat[2] = {0}; /* significance pattern*/
+ uint8_t res_off[2] = {0}; /* residual offset*/
+ uint8_t emb_pat_k[2] = {0}; /* Exponent Max Bound pattern K */
+ uint8_t emb_pat_1[2] = {0}; /* Exponent Max Bound pattern 1.*/
+ uint8_t gamma[2] = {0};
+
+ uint8_t E_n[2] = {0};
+ uint8_t E_ne[2] = {0};
+ uint8_t E_nw[2] = {0};
+ uint8_t E_nf[2] = {0};
+
+ uint8_t max_e[2] = {0};
+ uint8_t u_pfx[2] = {0};
+ uint8_t u_sfx[2] = {0};
+ uint8_t u_ext[2] = {0};
+
+ int32_t u[2] = {0};
+ int32_t U[2] = {0}; /* Exponent bound (7.3.7) */
+ int32_t m_n[2] = {0};
+ int32_t known_1[2] = {0};
+
+ int32_t m[2][4] = {0};
+ int32_t v[2][4] = {0};
+
+ uint8_t kappa[2] = {1, 1};
+ int ret = 0;
+
+ int sp;
+
+ uint64_t c;
+
+ uint8_t *sigma;
+ uint32_t *mu;
+
+ const uint8_t *vlc_buf = Dcup + Pcup;
+ /* convert to raster-scan */
+ const uint16_t is_border_x = width % 2;
+ const uint16_t is_border_y = height % 2;
+
+ const uint16_t quad_width = ff_jpeg2000_ceildivpow2(width, 1);
+ const uint16_t quad_height = ff_jpeg2000_ceildivpow2(height, 1);
+
+ size_t buf_size = 4 * quad_width * quad_height;
+
+ uint8_t *sigma_n = av_calloc(buf_size, sizeof(uint8_t));
+ uint8_t *E = av_calloc(buf_size, sizeof(uint8_t));
+ uint32_t *mu_n = av_calloc(buf_size, sizeof(uint32_t));
+
+ if (!sigma_n || !E || !mu_n) {
+ ret = AVERROR(ENOMEM);
+ goto free;
+ }
+
+ sigma = sigma_n;
+ mu = mu_n;
+
+ while (q < quad_width - 1) {
+ q1 = q;
+ q2 = q1 + 1;
+
+ if ((ret = jpeg2000_decode_sig_emb(s, mel_state, mel_stream, vlc_stream,
+ dec_cxt_vlc_table0, Dcup, sig_pat, res_off,
+ emb_pat_k, emb_pat_1, J2K_Q1, context, Lcup,
+ Pcup)) < 0)
+ goto free;
+ for (int i = 0; i < 4; i++)
+ sigma_n[4 * q1 + i] = (sig_pat[J2K_Q1] >> i) & 1;
+
+ // calculate context
+ context = sigma_n[4 * q1]; // f
+ context |= sigma_n[4 * q1 + 1]; // sf
+ context += sigma_n[4 * q1 + 2] << 1; // w << 1
+ context += sigma_n[4 * q1 + 3] << 2;
+
+ if ((ret = jpeg2000_decode_sig_emb(s, mel_state, mel_stream, vlc_stream,
+ dec_cxt_vlc_table0, Dcup, sig_pat, res_off,
+ emb_pat_k, emb_pat_1, J2K_Q2, context, Lcup,
+ Pcup)) < 0)
+ goto free;
+
+ for (int i = 0; i < 4; i++)
+ sigma_n[4 * q2 + i] = (sig_pat[J2K_Q2] >> i) & 1;
+
+ // calculate context for the next quad
+ context = sigma_n[4 * q2]; // f
+ context |= sigma_n[4 * q2 + 1]; // sf
+ context += sigma_n[4 * q2 + 2] << 1; // w << 1
+ context += sigma_n[4 * q2 + 3] << 2; // sw << 2
+
+ u[0] = 0;
+ u[1] = 0;
+
+ jpeg2000_bitbuf_refill_backwards(vlc_stream, vlc_buf);
+
+ if (res_off[J2K_Q1] == 1 && res_off[J2K_Q2] == 1) {
+
+ if (jpeg2000_decode_mel_sym(mel_state, mel_stream, Dcup, Lcup) == 1) {
+
+ u_pfx[J2K_Q1] = vlc_decode_u_prefix(vlc_stream, vlc_buf);
+ u_pfx[J2K_Q2] = vlc_decode_u_prefix(vlc_stream, vlc_buf);
+
+ u_sfx[J2K_Q1] = vlc_decode_u_suffix(vlc_stream, u_pfx[J2K_Q1], vlc_buf);
+ u_sfx[J2K_Q2] = vlc_decode_u_suffix(vlc_stream, u_pfx[J2K_Q2], vlc_buf);
+
+ u_ext[J2K_Q1] = vlc_decode_u_extension(vlc_stream, u_sfx[J2K_Q1], vlc_buf);
+ u_ext[J2K_Q2] = vlc_decode_u_extension(vlc_stream, u_sfx[J2K_Q2], vlc_buf);
+
+ u[J2K_Q1] = 2 + u_pfx[J2K_Q1] + u_sfx[J2K_Q1] + (u_ext[J2K_Q1] * 4);
+ u[J2K_Q2] = 2 + u_pfx[J2K_Q2] + u_sfx[J2K_Q2] + (u_ext[J2K_Q2] * 4);
+
+ } else {
+ u_pfx[J2K_Q1] = vlc_decode_u_prefix(vlc_stream, vlc_buf);
+
+ if (u_pfx[J2K_Q1] > 2) {
+ u[J2K_Q2] = jpeg2000_bitbuf_get_bits_lsb(vlc_stream, 1, vlc_buf) + 1;
+ u_sfx[J2K_Q1] = vlc_decode_u_suffix(vlc_stream, u_pfx[J2K_Q1], vlc_buf);
+ u_ext[J2K_Q1] = vlc_decode_u_extension(vlc_stream, u_sfx[J2K_Q1], vlc_buf);
+ } else {
+ u_pfx[J2K_Q2] = vlc_decode_u_prefix(vlc_stream, vlc_buf);
+ u_sfx[J2K_Q1] = vlc_decode_u_suffix(vlc_stream, u_pfx[J2K_Q1], vlc_buf);
+ u_sfx[J2K_Q2] = vlc_decode_u_suffix(vlc_stream, u_pfx[J2K_Q2], vlc_buf);
+ u_ext[J2K_Q1] = vlc_decode_u_extension(vlc_stream, u_sfx[J2K_Q1], vlc_buf);
+ u_ext[J2K_Q2] = vlc_decode_u_extension(vlc_stream, u_sfx[J2K_Q2], vlc_buf);
+ u[J2K_Q2] = u_pfx[J2K_Q2] + u_sfx[J2K_Q2] + (u_ext[J2K_Q2] * 4);
+ }
+ // clause 7.3.6 (3)
+ u[J2K_Q1] = u_pfx[J2K_Q1] + u_sfx[J2K_Q1] + (u_ext[J2K_Q1] * 4);
+ }
+
+ } else if (res_off[J2K_Q1] == 1 || res_off[J2K_Q2] == 1) {
+ uint8_t pos = res_off[J2K_Q1] == 1 ? 0 : 1;
+ u_pfx[pos] = vlc_decode_u_prefix(vlc_stream, vlc_buf);
+ u_sfx[pos] = vlc_decode_u_suffix(vlc_stream, u_pfx[pos], vlc_buf);
+ u_ext[pos] = vlc_decode_u_extension(vlc_stream, u_sfx[pos], vlc_buf);
+ u[pos] = u_pfx[pos] + u_sfx[pos] + (u_ext[pos] * 4);
+ }
+ U[J2K_Q1] = kappa[J2K_Q1] + u[J2K_Q1];
+ U[J2K_Q2] = kappa[J2K_Q2] + u[J2K_Q2];
+
+ for (int i = 0; i < 4; i++) {
+ m[J2K_Q1][i] = sigma_n[4 * q1 + i] * U[J2K_Q1] - ((emb_pat_k[J2K_Q1] >> i) & 1);
+ m[J2K_Q2][i] = sigma_n[4 * q2 + i] * U[J2K_Q2] - ((emb_pat_k[J2K_Q2] >> i) & 1);
+ }
+
+ recover_mag_sgn(mag_sgn_stream, J2K_Q1, q1, m_n, known_1, emb_pat_1, v, m,
+ E, mu_n, Dcup, Pcup, pLSB);
+
+ recover_mag_sgn(mag_sgn_stream, J2K_Q2, q2, m_n, known_1, emb_pat_1, v, m,
+ E, mu_n, Dcup, Pcup, pLSB);
+
+ // prepare context for the next quad
+
+ // move to the next quad pair
+ q += 2;
+ }
+ if (quad_width % 2 == 1) {
+ q1 = q;
+
+ if ((ret = jpeg2000_decode_sig_emb(s, mel_state, mel_stream, vlc_stream,
+ dec_cxt_vlc_table0, Dcup, sig_pat, res_off,
+ emb_pat_k, emb_pat_1, J2K_Q1, context, Lcup,
+ Pcup)) < 0)
+ goto free;
+
+ for (int i = 0; i < 4; i++)
+ sigma_n[4 * q1 + i] = (sig_pat[J2K_Q1] >> i) & 1;
+
+ u[J2K_Q1] = 0;
+
+ if (res_off[J2K_Q1] == 1) {
+ u_pfx[J2K_Q1] = vlc_decode_u_prefix(vlc_stream, vlc_buf);
+ u_sfx[J2K_Q1] = vlc_decode_u_suffix(vlc_stream, u_pfx[J2K_Q1], vlc_buf);
+ u_ext[J2K_Q1] = vlc_decode_u_extension(vlc_stream, u_sfx[J2K_Q1], vlc_buf);
+ u[J2K_Q1] = u_pfx[J2K_Q1] + u_sfx[J2K_Q1] + (u_ext[J2K_Q1] * 4);
+ }
+
+ U[J2K_Q1] = kappa[J2K_Q1] + u[J2K_Q1];
+
+ for (int i = 0; i < 4; i++)
+ m[J2K_Q1][i] = sigma_n[4 * q1 + i] * U[J2K_Q1] - ((emb_pat_k[J2K_Q1] >> i) & 1);
+
+ recover_mag_sgn(mag_sgn_stream, J2K_Q1, q1, m_n, known_1, emb_pat_1, v, m,
+ E, mu_n, Dcup, Pcup, pLSB);
+
+ q++; /* move to next quad pair */
+ }
+ /* initial line pair end. */
+ /*
+ * As an optimization, we can replace modulo operations with
+ * checking if a number is divisible , since that's the only thing we need.
+ * this is paired with is_divisible.
+ * Credits to Daniel Lemire blog post:
+ * https://lemire.me/blog/2019/02/08/faster-remainders-when-the-divisor-is-a-constant-beating-compilers-and-libdivide/
+ * It's UB on zero, but we can't have a quad being zero, the spec doesn't allow,
+ * so we error out early in case that's the case.
+ */
+ c = precompute_c(quad_width);
+
+ for (int row = 1; row < quad_height; row++) {
+ while ((q - (row * quad_width)) < quad_width - 1 && q < (quad_height * quad_width)) {
+ q1 = q;
+ q2 = q + 1;
+ context1 = sigma_n[4 * (q1 - quad_width) + 1];
+ context1 += sigma_n[4 * (q1 - quad_width) + 3] << 2; // ne
+
+ if (!is_divisible(q1, c)) {
+ context1 |= sigma_n[4 * (q1 - quad_width) - 1]; // nw
+ context1 += (sigma_n[4 * q1 - 1] | sigma_n[4 * q1 - 2]) << 1; // sw| q
+ }
+ if (!is_divisible(q1 + 1, c))
+ context1 |= sigma_n[4 * (q1 - quad_width) + 5] << 2;
+
+ if ((ret = jpeg2000_decode_sig_emb(s, mel_state, mel_stream, vlc_stream,
+ dec_cxt_vlc_table1, Dcup, sig_pat, res_off,
+ emb_pat_k, emb_pat_1, J2K_Q1, context1, Lcup,
+ Pcup))
+ < 0)
+ goto free;
+
+ for (int i = 0; i < 4; i++)
+ sigma_n[4 * q1 + i] = (sig_pat[J2K_Q1] >> i) & 1;
+
+ context2 = sigma_n[4 * (q2 - quad_width) + 1];
+ context2 += sigma_n[4 * (q2 - quad_width) + 3] << 2;
+
+ if (!is_divisible(q2, c)) {
+ context2 |= sigma_n[4 * (q2 - quad_width) - 1];
+ context2 += (sigma_n[4 * q2 - 1] | sigma_n[4 * q2 - 2]) << 1;
+ }
+ if (!is_divisible(q2 + 1, c))
+ context2 |= sigma_n[4 * (q2 - quad_width) + 5] << 2;
+
+ if ((ret = jpeg2000_decode_sig_emb(s, mel_state, mel_stream, vlc_stream,
+ dec_cxt_vlc_table1, Dcup, sig_pat, res_off,
+ emb_pat_k, emb_pat_1, J2K_Q2, context2, Lcup,
+ Pcup))
+ < 0)
+ goto free;
+
+ for (int i = 0; i < 4; i++)
+ sigma_n[4 * q2 + i] = (sig_pat[J2K_Q2] >> i) & 1;
+
+ u[J2K_Q1] = 0;
+ u[J2K_Q2] = 0;
+
+ jpeg2000_bitbuf_refill_backwards(vlc_stream, vlc_buf);
+
+ if (res_off[J2K_Q1] == 1 && res_off[J2K_Q2] == 1) {
+ u_pfx[J2K_Q1] = vlc_decode_u_prefix(vlc_stream, vlc_buf);
+ u_pfx[J2K_Q2] = vlc_decode_u_prefix(vlc_stream, vlc_buf);
+
+ u_sfx[J2K_Q1] = vlc_decode_u_suffix(vlc_stream, u_pfx[J2K_Q1], vlc_buf);
+ u_sfx[J2K_Q2] = vlc_decode_u_suffix(vlc_stream, u_pfx[J2K_Q2], vlc_buf);
+
+ u_ext[J2K_Q1] = vlc_decode_u_extension(vlc_stream, u_sfx[J2K_Q1], vlc_buf);
+ u_ext[J2K_Q2] = vlc_decode_u_extension(vlc_stream, u_sfx[J2K_Q2], vlc_buf);
+
+ u[J2K_Q1] = u_pfx[J2K_Q1] + u_sfx[J2K_Q1] + (u_ext[J2K_Q1] << 2);
+ u[J2K_Q2] = u_pfx[J2K_Q2] + u_sfx[J2K_Q2] + (u_ext[J2K_Q2] << 2);
+
+ } else if (res_off[J2K_Q1] == 1 || res_off[J2K_Q2] == 1) {
+ uint8_t pos = res_off[J2K_Q1] == 1 ? 0 : 1;
+
+ u_pfx[pos] = vlc_decode_u_prefix(vlc_stream, vlc_buf);
+ u_sfx[pos] = vlc_decode_u_suffix(vlc_stream, u_pfx[pos], vlc_buf);
+ u_ext[pos] = vlc_decode_u_extension(vlc_stream, u_sfx[pos], vlc_buf);
+
+ u[pos] = u_pfx[pos] + u_sfx[pos] + (u_ext[pos] << 2);
+ }
+ sp = sig_pat[J2K_Q1];
+
+ gamma[J2K_Q1] = 1;
+
+ if (sp == 0 || sp == 1 || sp == 2 || sp == 4 || sp == 8)
+ gamma[J2K_Q1] = 0;
+
+ sp = sig_pat[J2K_Q2];
+
+ gamma[J2K_Q2] = 1;
+
+ if (sp == 0 || sp == 1 || sp == 2 || sp == 4 || sp == 8)
+ gamma[J2K_Q2] = 0;
+
+ E_n[J2K_Q1] = E[4 * (q1 - quad_width) + 1];
+ E_n[J2K_Q2] = E[4 * (q2 - quad_width) + 1];
+
+ E_ne[J2K_Q1] = E[4 * (q1 - quad_width) + 3];
+ E_ne[J2K_Q2] = E[4 * (q2 - quad_width) + 3];
+
+ E_nw[J2K_Q1] = (!is_divisible(q1, c)) * E[FFMAX((4 * (q1 - quad_width) - 1), 0)];
+ E_nw[J2K_Q2] = (!is_divisible(q2, c)) * E[FFMAX((4 * (q2 - quad_width) - 1), 0)];
+
+ E_nf[J2K_Q1] = (!is_divisible(q1 + 1, c)) * E[4 * (q1 - quad_width) + 5];
+ E_nf[J2K_Q2] = (!is_divisible(q2 + 1, c)) * E[4 * (q2 - quad_width) + 5];
+
+ max_e[J2K_Q1] = FFMAX(E_nw[J2K_Q1], FFMAX3(E_n[J2K_Q1], E_ne[J2K_Q1], E_nf[J2K_Q1]));
+ max_e[J2K_Q2] = FFMAX(E_nw[J2K_Q2], FFMAX3(E_n[J2K_Q2], E_ne[J2K_Q2], E_nf[J2K_Q2]));
+
+ kappa[J2K_Q1] = FFMAX(1, gamma[J2K_Q1] * (max_e[J2K_Q1] - 1));
+ kappa[J2K_Q2] = FFMAX(1, gamma[J2K_Q2] * (max_e[J2K_Q2] - 1));
+
+ U[J2K_Q1] = kappa[J2K_Q1] + u[J2K_Q1];
+ U[J2K_Q2] = kappa[J2K_Q2] + u[J2K_Q2];
+
+ for (int i = 0; i < 4; i++) {
+ m[J2K_Q1][i] = sigma_n[4 * q1 + i] * U[J2K_Q1] - ((emb_pat_k[J2K_Q1] >> i) & 1);
+ m[J2K_Q2][i] = sigma_n[4 * q2 + i] * U[J2K_Q2] - ((emb_pat_k[J2K_Q2] >> i) & 1);
+ }
+ recover_mag_sgn(mag_sgn_stream, J2K_Q1, q1, m_n, known_1, emb_pat_1, v, m,
+ E, mu_n, Dcup, Pcup, pLSB);
+
+ recover_mag_sgn(mag_sgn_stream, J2K_Q2, q2, m_n, known_1, emb_pat_1, v, m,
+ E, mu_n, Dcup, Pcup, pLSB);
+
+ /* move to the next quad pair */
+ q += 2;
+ }
+ if (quad_width % 2 == 1) {
+ q1 = q;
+ /* calculate context for current quad */
+ context1 = sigma_n[4 * (q1 - quad_width) + 1];
+ context1 += (sigma_n[4 * (q1 - quad_width) + 3] << 2);
+
+ if (!is_divisible(q1, c)) {
+ context1 |= sigma_n[4 * (q1 - quad_width) - 1];
+ context1 += (sigma_n[4 * q1 - 1] | sigma_n[4 * q1 - 2]) << 1;
+ }
+ if (!is_divisible(q1 + 1, c))
+ context1 |= sigma_n[4 * (q1 - quad_width) + 5] << 2;
+
+ if ((ret = jpeg2000_decode_sig_emb(s, mel_state, mel_stream, vlc_stream,
+ dec_cxt_vlc_table1, Dcup, sig_pat, res_off,
+ emb_pat_k, emb_pat_1, J2K_Q1, context1, Lcup,
+ Pcup))
+ < 0)
+ goto free;
+
+ for (int i = 0; i < 4; i++)
+ sigma_n[4 * q1 + i] = (sig_pat[J2K_Q1] >> i) & 1;
+
+ u[J2K_Q1] = 0;
+
+ /* Recover mag_sgn value */
+ if (res_off[J2K_Q1] == 1) {
+ u_pfx[J2K_Q1] = vlc_decode_u_prefix(vlc_stream, vlc_buf);
+ u_sfx[J2K_Q1] = vlc_decode_u_suffix(vlc_stream, u_pfx[J2K_Q1], vlc_buf);
+ u_ext[J2K_Q1] = vlc_decode_u_extension(vlc_stream, u_sfx[J2K_Q1], vlc_buf);
+
+ u[J2K_Q1] = u_pfx[J2K_Q1] + u_sfx[J2K_Q1] + (u_ext[J2K_Q1] << 2);
+ }
+
+ sp = sig_pat[J2K_Q1];
+
+ gamma[J2K_Q1] = 1;
+
+ if (sp == 0 || sp == 1 || sp == 2 || sp == 4 || sp == 8)
+ gamma[J2K_Q1] = 0;
+
+ E_n[J2K_Q1] = E[4 * (q1 - quad_width) + 1];
+
+ E_ne[J2K_Q1] = E[4 * (q1 - quad_width) + 3];
+
+ E_nw[J2K_Q1] = (!is_divisible(q1, c)) * E[FFMAX((4 * (q1 - quad_width) - 1), 0)];
+
+ E_nf[J2K_Q1] = (!is_divisible(q1 + 1, c)) * E[4 * (q1 - quad_width) + 5];
+
+ max_e[J2K_Q1] = FFMAX(E_nw[J2K_Q1], FFMAX3(E_n[J2K_Q1], E_ne[J2K_Q1], E_nf[J2K_Q1]));
+
+ kappa[J2K_Q1] = FFMAX(1, gamma[J2K_Q1] * (max_e[J2K_Q1] - 1));
+
+ U[J2K_Q1] = kappa[J2K_Q1] + u[J2K_Q1];
+
+ for (int i = 0; i < 4; i++)
+ m[J2K_Q1][i] = sigma_n[4 * q1 + i] * U[J2K_Q1] - ((emb_pat_k[J2K_Q1] >> i) & 1);
+
+ recover_mag_sgn(mag_sgn_stream, J2K_Q1, q1, m_n, known_1, emb_pat_1, v, m,
+ E, mu_n, Dcup, Pcup, pLSB);
+ q += 1;
+ }
+ }
+ // convert to raster-scan
+ for (int y = 0; y < quad_height; y++) {
+ for (int x = 0; x < quad_width; x++) {
+ int j1, j2;
+ int x1, x2 , x3;
+
+ j1 = 2 * y;
+ j2 = 2 * x;
+
+ sample_buf[j2 + (j1 * width)] = (int32_t)*mu;
+ jpeg2000_modify_state(j1, j2, width, *sigma, block_states);
+ sigma += 1;
+ mu += 1;
+
+ x1 = y != quad_height - 1 || is_border_y == 0;
+ sample_buf[j2 + ((j1 + 1) * width)] = ((int32_t)*mu) * x1;
+ jpeg2000_modify_state(j1 + 1, j2, width, (*sigma) * x1, block_states);
+ sigma += 1;
+ mu += 1;
+
+ x2 = x != quad_width - 1 || is_border_x == 0;
+ sample_buf[(j2 + 1) + (j1 * width)] = ((int32_t)*mu) * x2;
+ jpeg2000_modify_state(j1, j2 + 1, width, (*sigma) * x2, block_states);
+ sigma += 1;
+ mu += 1;
+
+ x3 = x1 | x2;
+ sample_buf[(j2 + 1) + (j1 + 1) * width] = ((int32_t)*mu) * x3;
+ jpeg2000_modify_state(j1 + 1, j2 + 1, width, (*sigma) * x3, block_states);
+ sigma += 1;
+ mu += 1;
+ }
+ }
+ ret = 1;
+free:
+ av_freep(&sigma_n);
+ av_freep(&E);
+ av_freep(&mu_n);
+ return ret;
+}
+
+static void
+jpeg2000_calc_mbr(uint8_t *mbr, const uint16_t i, const uint16_t j, const uint32_t mbr_info, uint8_t causal_cond,
+ uint8_t *block_states, int width)
+{
+
+ int local_mbr = 0;
+ local_mbr |= jpeg2000_get_state(i - 1, j - 1, width, HT_SHIFT_SIGMA, block_states);
+ local_mbr |= jpeg2000_get_state(i - 1, j + 0, width, HT_SHIFT_SIGMA, block_states);
+ local_mbr |= jpeg2000_get_state(i - 1, j + 1, width, HT_SHIFT_SIGMA, block_states);
+
+ local_mbr |= jpeg2000_get_state(i + 0, j - 1, width, HT_SHIFT_SIGMA, block_states);
+ local_mbr |= jpeg2000_get_state(i + 0, j + 1, width, HT_SHIFT_SIGMA, block_states);
+
+ local_mbr |= jpeg2000_get_state(i + 1, j - 1, width, HT_SHIFT_SIGMA, block_states) * causal_cond;
+ local_mbr |= jpeg2000_get_state(i + 1, j + 0, width, HT_SHIFT_SIGMA, block_states) * causal_cond;
+ local_mbr |= jpeg2000_get_state(i + 1, j + 1, width, HT_SHIFT_SIGMA, block_states) * causal_cond;
+
+ local_mbr |= jpeg2000_get_state(i - 1, j - 1, width, HT_SHIFT_REF, block_states) *
+ jpeg2000_get_state(i - 1, j - 1, width, HT_SHIFT_SCAN, block_states);
+ local_mbr |= jpeg2000_get_state(i - 1, j + 0, width, HT_SHIFT_REF, block_states) *
+ jpeg2000_get_state(i - 1, j - 1, width, HT_SHIFT_SCAN, block_states);
+ local_mbr |= jpeg2000_get_state(i - 1, j + 1, width, HT_SHIFT_REF, block_states) *
+ jpeg2000_get_state(i - 1, j + 1, width, HT_SHIFT_SCAN, block_states);
+
+ local_mbr |= jpeg2000_get_state(i + 0, j - 1, width, HT_SHIFT_REF, block_states) *
+ jpeg2000_get_state(i + 0, j - 1, width, HT_SHIFT_SCAN, block_states);
+ local_mbr |= jpeg2000_get_state(i + 0, j + 1, width, HT_SHIFT_REF, block_states) *
+ jpeg2000_get_state(i + 0, j + 1, width, HT_SHIFT_SCAN, block_states);
+
+ local_mbr |= jpeg2000_get_state(i + 1, j - 1, width, HT_SHIFT_REF, block_states) *
+ jpeg2000_get_state(i + 1, j - 1, width, HT_SHIFT_SCAN, block_states) * causal_cond;
+ local_mbr |= jpeg2000_get_state(i + 1, j + 0, width, HT_SHIFT_REF, block_states) *
+ jpeg2000_get_state(i + 1, j + 0, width, HT_SHIFT_SCAN, block_states) * causal_cond;
+ local_mbr |= jpeg2000_get_state(i + 1, j + 1, width, HT_SHIFT_REF, block_states) *
+ jpeg2000_get_state(i + 1, j + 1, width, HT_SHIFT_SCAN, block_states) * causal_cond;
+
+ *mbr |= local_mbr;
+}
+
+static void
+jpeg2000_process_stripes_block(StateVars *sig_prop, int i_s, int j_s, int width, int height, int stride, int pLSB,
+ int32_t *sample_buf, uint8_t *block_states, uint8_t *magref_segment,
+ uint32_t magref_length)
+{
+ for (int j = j_s; j < j_s + width; j++) {
+ uint32_t mbr_info = 0;
+ for (int i = i_s; i < i_s + height; i++) {
+ int modify_state, cond;
+ uint8_t bit;
+ uint8_t causal_cond = i != (i_s + height - 1);
+ int32_t *sp = &sample_buf[j + (i * (stride - 2))];
+ uint8_t mbr = 0;
+
+ if (jpeg2000_get_state(i, j, stride - 2, HT_SHIFT_SIGMA, block_states) == 0)
+ jpeg2000_calc_mbr(&mbr, i, j, mbr_info & 0x1EF, causal_cond, block_states, stride - 2);
+ mbr_info >>= 3;
+ cond = mbr != 0;
+ bit = jpeg2000_peek_bit(sig_prop, magref_segment, magref_length);
+ *sp |= (bit * cond) << pLSB;
+ sig_prop->bits -= cond;
+ modify_state = (((1 << HT_SHIFT_REF_IND) | (1 << HT_SHIFT_REF)) * cond) | 1 << HT_SHIFT_SCAN;
+ jpeg2000_modify_state(i, j, stride - 2, modify_state, block_states);
+ }
+ }
+}
+
+static void av_noinline
+jpeg2000_decode_sigprop_segment(Jpeg2000Cblk *cblk, uint16_t width, uint16_t height, uint8_t *magref_segment,
+ uint32_t magref_length, uint8_t pLSB, int32_t *sample_buf, uint8_t *block_states)
+{
+ /* Described in clause 7.4
+ * procedure: decodeSigPropMag
+ */
+ StateVars sp_dec;
+ const uint16_t num_v_stripe = height / 4;
+ const uint16_t num_h_stripe = width / 4;
+ int b_width = 4;
+ int b_height = 4;
+ int stride = width + 2;
+ int last_width;
+ uint16_t i = 0, j = 0;
+
+ jpeg2000_init_zero(&sp_dec);
+
+ for (int n1 = 0; n1 < num_v_stripe; n1++) {
+ j = 0;
+ for (int n2 = 0; n2 < num_h_stripe; n2++) {
+ jpeg2000_process_stripes_block(&sp_dec, i, j, b_width, b_height, stride,
+ pLSB, sample_buf, block_states, magref_segment,
+ magref_length);
+ j += 4;
+ }
+ last_width = width % 4;
+ if (last_width)
+ jpeg2000_process_stripes_block(&sp_dec, i, j, last_width, b_height, stride,
+ pLSB, sample_buf, block_states, magref_segment,
+ magref_length);
+ i += 4;
+ }
+ /* decode remaining height stripes */
+ b_height = height % 4;
+ j = 0;
+ for (int n2 = 0; n2 < num_h_stripe; n2++) {
+ jpeg2000_process_stripes_block(&sp_dec, i, j, b_width, b_height, stride,
+ pLSB, sample_buf, block_states, magref_segment,
+ magref_length);
+ j += 4;
+ }
+ last_width = width % 4;
+ if (last_width)
+ jpeg2000_process_stripes_block(&sp_dec, i, j, last_width, b_height, stride,
+ pLSB, sample_buf, block_states, magref_segment,
+ magref_length);
+}
+
+static int
+jpeg2000_decode_magref_segment(Jpeg2000Cblk *cblk, uint16_t width, uint16_t block_height, uint8_t *magref_segment,
+ uint32_t magref_length, uint8_t pLSB, int32_t *sample_buf, uint8_t *block_states)
+{
+ /*
+ * Described in clause 7.5
+ * procedure: decodeSigPropMag
+ */
+
+ StateVars mag_ref = {0};
+ const uint16_t num_v_stripe = block_height / 4;
+ uint16_t height = 4;
+ uint16_t i_start = 0;
+ int32_t *sp;
+
+ jpeg2000_init_mag_ref(&mag_ref, magref_length);
+
+ for (int n1 = 0; n1 < num_v_stripe; n1++) {
+ for (int j = 0; j < width; j++) {
+ for (int i = i_start; i < i_start + height; i++) {
+ /* we move column wise, going from one quad to another
+ * see figure 7.
+ */
+ sp = &sample_buf[j + i * width];
+ if (jpeg2000_get_state(i, j, width, HT_SHIFT_SIGMA, block_states) != 0) {
+ jpeg2000_modify_state(i, j, width, 1 << HT_SHIFT_REF_IND, block_states);
+ *sp |= jpeg2000_import_magref_bit(&mag_ref, magref_segment, magref_length) << pLSB;
+ }
+ }
+ }
+ i_start += 4;
+ }
+ height = block_height % 4;
+ for (int j = 0; j < width; j++) {
+ for (int i = i_start; i < i_start + height; i++) {
+ sp = &sample_buf[j + i * width];
+ if (jpeg2000_get_state(i, j, width, HT_SHIFT_SIGMA, block_states) != 0) {
+ jpeg2000_modify_state(i, j, width, 1 << HT_SHIFT_REF_IND, block_states);
+ *sp |= jpeg2000_import_magref_bit(&mag_ref, magref_segment, magref_length) << pLSB;
+ }
+ }
+ }
+ return 1;
+}
+
+
+int
+ff_jpeg2000_decode_htj2k(const Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty, Jpeg2000T1Context *t1, Jpeg2000Cblk *cblk,
+ int width, int height, int magp, uint8_t roi_shift)
+{
+ uint8_t p0 = 0; /* Number of placeholder passes. */
+ uint32_t Lcup; /* Length of HT cleanup segment. */
+ uint32_t Lref; /* Length of Refinement segment. */
+ uint32_t Scup; /* HT cleanup segment suffix length. */
+ uint32_t Pcup; /* HT cleanup segment prefix length. */
+
+ uint8_t S_blk; /* Number of skipped magnitude bitplanes; */
+ uint8_t pLSB;
+
+ uint8_t *Dcup; /* Byte of an HT cleanup segment. */
+ uint8_t *Dref; /* Byte of an HT refinement segment. */
+
+ int z_blk; /* Number of ht coding pass */
+
+ uint8_t empty_passes;
+
+ StateVars mag_sgn; /* Magnitude and Sign */
+ StateVars mel; /* Adaptive run-length coding */
+ StateVars vlc; /* Variable Length coding */
+ StateVars sig_prop; /* Significance propagation */
+
+ MelDecoderState mel_state;
+
+ int ret;
+
+ /* Temporary buffers */
+ int32_t *sample_buf;
+ uint8_t *block_states;
+
+ /* Post-processing */
+ int32_t n, val;
+
+ int32_t M_b = magp;
+ av_assert0(width <= 1024U && height <= 1024U);
+ av_assert0(width * height <= 4096);
+ av_assert0(width * height > 0);
+
+ memset(t1->data, 0, t1->stride * height * sizeof(*t1->data));
+ memset(t1->flags, 0, t1->stride * (height + 2) * sizeof(*t1->flags));
+
+ if (cblk->npasses == 0)
+ return 0;
+
+ if (cblk->npasses > 3)
+ p0 = 0;
+ else if (cblk->length == 0)
+ p0 = 1;
+
+ empty_passes = p0 * 3;
+ z_blk = cblk->npasses - empty_passes;
+
+ if (z_blk <= 0)
+ /* no passes within this set, continue */
+ return 0;
+
+ Lcup = cblk->pass_lengths[0];
+ Lref = cblk->pass_lengths[1];
+
+ if (Lcup < 2) {
+ av_log(s->avctx, AV_LOG_ERROR,
+ "Cleanup pass length must be at least 2 bytes in length\n");
+ return AVERROR_INVALIDDATA;
+ }
+ Dcup = cblk->data;
+ /* Dref comes after the refinement segment. */
+ Dref = cblk->data + Lcup;
+ S_blk = p0 + cblk->zbp;
+ pLSB = 30 - S_blk;
+
+ Scup = (Dcup[Lcup - 1] << 4) + (Dcup[Lcup - 2] & 0x0F);
+
+ if (Scup < 2 || Scup > Lcup || Scup > 4079) {
+ av_log(s->avctx, AV_LOG_ERROR, "Cleanup pass suffix length is invalid %d\n",
+ Scup);
+ ret = AVERROR_INVALIDDATA;
+ goto free;
+ }
+ Pcup = Lcup - Scup;
+
+ /* modDcup shall be done before the creation of vlc instance. */
+ Dcup[Lcup - 1] = 0xFF;
+ Dcup[Lcup - 2] |= 0x0F;
+ /* Magnitude and refinement */
+ jpeg2000_init_zero(&mag_sgn);
+ jpeg2000_bitbuf_refill_forward(&mag_sgn, Dcup, Pcup);
+ /* Significance propagation */
+ jpeg2000_init_zero(&sig_prop);
+ /* Adaptive run length */
+ jpeg2000_init_mel(&mel, Pcup);
+ /* Variable Length coding. */
+ jpeg2000_init_vlc(&vlc, Lcup, Pcup, Dcup);
+
+ jpeg2000_init_mel_decoder(&mel_state);
+
+ sample_buf = av_calloc((width + 4) * (height + 4), sizeof(int32_t));
+ block_states = av_calloc((width + 4) * (height + 4), sizeof(uint8_t));
+
+ if (!sample_buf || !block_states) {
+ ret = AVERROR(ENOMEM);
+ goto free;
+ }
+ if ((ret = jpeg2000_decode_ht_cleanup_segment(s, cblk, t1, &mel_state, &mel, &vlc,
+ &mag_sgn, Dcup, Lcup, Pcup, pLSB, width,
+ height, sample_buf, block_states))
+ < 0)
+ goto free;
+
+ if (cblk->npasses > 1)
+ jpeg2000_decode_sigprop_segment(cblk, width, height, Dref, Lref,
+ pLSB - 1, sample_buf, block_states);
+
+ if (cblk->npasses > 2)
+ if ((ret = jpeg2000_decode_magref_segment(cblk, width, height, Dref, Lref,
+ pLSB - 1, sample_buf, block_states))
+ < 0)
+ goto free;
+
+ pLSB = 31 - M_b;
+ /* Reconstruct the values. */
+ for (int y = 0; y < height; y++) {
+ for (int x = 0; x < width; x++) {
+ n = x + (y * t1->stride);
+ val = sample_buf[x + (y * width)];
+ /* Convert sign-magnitude to twos complement. */
+ val = val >> 31 ? 0x80000000 - val : val;
+ val >>= (pLSB - 1);
+ t1->data[n] = val;
+ }
+ }
+free:
+ av_freep(&sample_buf);
+ av_freep(&block_states);
+ return ret;
+}
+
+/**
+ * @brief CtxVLC tables, borrowed from openhtj2k (https://github.com/osamu620/OpenHTJ2K) (credits to Osamu Watanabe)
+ */
+static const uint16_t dec_cxt_vlc_table1[1024] = {
+ 0x0016, 0x006A, 0x0046, 0x00DD, 0x0086, 0x888B, 0x0026, 0x444D, 0x0016, 0x00AA, 0x0046, 0x88AD, 0x0086,
+ 0x003A, 0x0026, 0x00DE, 0x0016, 0x00CA, 0x0046, 0x009D, 0x0086, 0x005A, 0x0026, 0x222D, 0x0016, 0x009A,
+ 0x0046, 0x007D, 0x0086, 0x01FD, 0x0026, 0x007E, 0x0016, 0x006A, 0x0046, 0x88CD, 0x0086, 0x888B, 0x0026,
+ 0x111D, 0x0016, 0x00AA, 0x0046, 0x005D, 0x0086, 0x003A, 0x0026, 0x00EE, 0x0016, 0x00CA, 0x0046, 0x00BD,
+ 0x0086, 0x005A, 0x0026, 0x11FF, 0x0016, 0x009A, 0x0046, 0x003D, 0x0086, 0x04ED, 0x0026, 0x2AAF, 0x0016,
+ 0x006A, 0x0046, 0x00DD, 0x0086, 0x888B, 0x0026, 0x444D, 0x0016, 0x00AA, 0x0046, 0x88AD, 0x0086, 0x003A,
+ 0x0026, 0x44EF, 0x0016, 0x00CA, 0x0046, 0x009D, 0x0086, 0x005A, 0x0026, 0x222D, 0x0016, 0x009A, 0x0046,
+ 0x007D, 0x0086, 0x01FD, 0x0026, 0x00BE, 0x0016, 0x006A, 0x0046, 0x88CD, 0x0086, 0x888B, 0x0026, 0x111D,
+ 0x0016, 0x00AA, 0x0046, 0x005D, 0x0086, 0x003A, 0x0026, 0x4CCF, 0x0016, 0x00CA, 0x0046, 0x00BD, 0x0086,
+ 0x005A, 0x0026, 0x00FE, 0x0016, 0x009A, 0x0046, 0x003D, 0x0086, 0x04ED, 0x0026, 0x006F, 0x0002, 0x0088,
+ 0x0002, 0x005C, 0x0002, 0x0018, 0x0002, 0x00DE, 0x0002, 0x0028, 0x0002, 0x009C, 0x0002, 0x004A, 0x0002,
+ 0x007E, 0x0002, 0x0088, 0x0002, 0x00CC, 0x0002, 0x0018, 0x0002, 0x888F, 0x0002, 0x0028, 0x0002, 0x00FE,
+ 0x0002, 0x003A, 0x0002, 0x222F, 0x0002, 0x0088, 0x0002, 0x04FD, 0x0002, 0x0018, 0x0002, 0x00BE, 0x0002,
+ 0x0028, 0x0002, 0x00BF, 0x0002, 0x004A, 0x0002, 0x006E, 0x0002, 0x0088, 0x0002, 0x00AC, 0x0002, 0x0018,
+ 0x0002, 0x444F, 0x0002, 0x0028, 0x0002, 0x00EE, 0x0002, 0x003A, 0x0002, 0x113F, 0x0002, 0x0088, 0x0002,
+ 0x005C, 0x0002, 0x0018, 0x0002, 0x00CF, 0x0002, 0x0028, 0x0002, 0x009C, 0x0002, 0x004A, 0x0002, 0x006F,
+ 0x0002, 0x0088, 0x0002, 0x00CC, 0x0002, 0x0018, 0x0002, 0x009F, 0x0002, 0x0028, 0x0002, 0x00EF, 0x0002,
+ 0x003A, 0x0002, 0x233F, 0x0002, 0x0088, 0x0002, 0x04FD, 0x0002, 0x0018, 0x0002, 0x00AF, 0x0002, 0x0028,
+ 0x0002, 0x44FF, 0x0002, 0x004A, 0x0002, 0x005F, 0x0002, 0x0088, 0x0002, 0x00AC, 0x0002, 0x0018, 0x0002,
+ 0x007F, 0x0002, 0x0028, 0x0002, 0x00DF, 0x0002, 0x003A, 0x0002, 0x111F, 0x0002, 0x0028, 0x0002, 0x005C,
+ 0x0002, 0x008A, 0x0002, 0x00BF, 0x0002, 0x0018, 0x0002, 0x00FE, 0x0002, 0x00CC, 0x0002, 0x007E, 0x0002,
+ 0x0028, 0x0002, 0x8FFF, 0x0002, 0x004A, 0x0002, 0x007F, 0x0002, 0x0018, 0x0002, 0x00DF, 0x0002, 0x00AC,
+ 0x0002, 0x133F, 0x0002, 0x0028, 0x0002, 0x222D, 0x0002, 0x008A, 0x0002, 0x00BE, 0x0002, 0x0018, 0x0002,
+ 0x44EF, 0x0002, 0x2AAD, 0x0002, 0x006E, 0x0002, 0x0028, 0x0002, 0x15FF, 0x0002, 0x004A, 0x0002, 0x009E,
+ 0x0002, 0x0018, 0x0002, 0x00CF, 0x0002, 0x003C, 0x0002, 0x223F, 0x0002, 0x0028, 0x0002, 0x005C, 0x0002,
+ 0x008A, 0x0002, 0x2BBF, 0x0002, 0x0018, 0x0002, 0x04EF, 0x0002, 0x00CC, 0x0002, 0x006F, 0x0002, 0x0028,
+ 0x0002, 0x27FF, 0x0002, 0x004A, 0x0002, 0x009F, 0x0002, 0x0018, 0x0002, 0x00DE, 0x0002, 0x00AC, 0x0002,
+ 0x444F, 0x0002, 0x0028, 0x0002, 0x222D, 0x0002, 0x008A, 0x0002, 0x8AAF, 0x0002, 0x0018, 0x0002, 0x00EE,
+ 0x0002, 0x2AAD, 0x0002, 0x005F, 0x0002, 0x0028, 0x0002, 0x44FF, 0x0002, 0x004A, 0x0002, 0x888F, 0x0002,
+ 0x0018, 0x0002, 0xAAAF, 0x0002, 0x003C, 0x0002, 0x111F, 0x0004, 0x8FFD, 0x0028, 0x005C, 0x0004, 0x00BC,
+ 0x008A, 0x66FF, 0x0004, 0x00CD, 0x0018, 0x111D, 0x0004, 0x009C, 0x003A, 0x8AAF, 0x0004, 0x00FC, 0x0028,
+ 0x133D, 0x0004, 0x00AC, 0x004A, 0x3BBF, 0x0004, 0x2BBD, 0x0018, 0x5FFF, 0x0004, 0x006C, 0x157D, 0x455F,
+ 0x0004, 0x2FFD, 0x0028, 0x222D, 0x0004, 0x22AD, 0x008A, 0x44EF, 0x0004, 0x00CC, 0x0018, 0x4FFF, 0x0004,
+ 0x007C, 0x003A, 0x447F, 0x0004, 0x04DD, 0x0028, 0x233D, 0x0004, 0x009D, 0x004A, 0x00DE, 0x0004, 0x88BD,
+ 0x0018, 0xAFFF, 0x0004, 0x115D, 0x1FFD, 0x444F, 0x0004, 0x8FFD, 0x0028, 0x005C, 0x0004, 0x00BC, 0x008A,
+ 0x8CEF, 0x0004, 0x00CD, 0x0018, 0x111D, 0x0004, 0x009C, 0x003A, 0x888F, 0x0004, 0x00FC, 0x0028, 0x133D,
+ 0x0004, 0x00AC, 0x004A, 0x44DF, 0x0004, 0x2BBD, 0x0018, 0x8AFF, 0x0004, 0x006C, 0x157D, 0x006F, 0x0004,
+ 0x2FFD, 0x0028, 0x222D, 0x0004, 0x22AD, 0x008A, 0x00EE, 0x0004, 0x00CC, 0x0018, 0x2EEF, 0x0004, 0x007C,
+ 0x003A, 0x277F, 0x0004, 0x04DD, 0x0028, 0x233D, 0x0004, 0x009D, 0x004A, 0x1BBF, 0x0004, 0x88BD, 0x0018,
+ 0x37FF, 0x0004, 0x115D, 0x1FFD, 0x333F, 0x0002, 0x0088, 0x0002, 0x02ED, 0x0002, 0x00CA, 0x0002, 0x4CCF,
+ 0x0002, 0x0048, 0x0002, 0x23FF, 0x0002, 0x001A, 0x0002, 0x888F, 0x0002, 0x0088, 0x0002, 0x006C, 0x0002,
+ 0x002A, 0x0002, 0x00AF, 0x0002, 0x0048, 0x0002, 0x22EF, 0x0002, 0x00AC, 0x0002, 0x005F, 0x0002, 0x0088,
+ 0x0002, 0x444D, 0x0002, 0x00CA, 0x0002, 0xCCCF, 0x0002, 0x0048, 0x0002, 0x00FE, 0x0002, 0x001A, 0x0002,
+ 0x006F, 0x0002, 0x0088, 0x0002, 0x005C, 0x0002, 0x002A, 0x0002, 0x009F, 0x0002, 0x0048, 0x0002, 0x00DF,
+ 0x0002, 0x03FD, 0x0002, 0x222F, 0x0002, 0x0088, 0x0002, 0x02ED, 0x0002, 0x00CA, 0x0002, 0x8CCF, 0x0002,
+ 0x0048, 0x0002, 0x11FF, 0x0002, 0x001A, 0x0002, 0x007E, 0x0002, 0x0088, 0x0002, 0x006C, 0x0002, 0x002A,
+ 0x0002, 0x007F, 0x0002, 0x0048, 0x0002, 0x00EE, 0x0002, 0x00AC, 0x0002, 0x003E, 0x0002, 0x0088, 0x0002,
+ 0x444D, 0x0002, 0x00CA, 0x0002, 0x00BE, 0x0002, 0x0048, 0x0002, 0x00BF, 0x0002, 0x001A, 0x0002, 0x003F,
+ 0x0002, 0x0088, 0x0002, 0x005C, 0x0002, 0x002A, 0x0002, 0x009E, 0x0002, 0x0048, 0x0002, 0x00DE, 0x0002,
+ 0x03FD, 0x0002, 0x111F, 0x0004, 0x8AED, 0x0048, 0x888D, 0x0004, 0x00DC, 0x00CA, 0x3FFF, 0x0004, 0xCFFD,
+ 0x002A, 0x003D, 0x0004, 0x00BC, 0x005A, 0x8DDF, 0x0004, 0x8FFD, 0x0048, 0x006C, 0x0004, 0x027D, 0x008A,
+ 0x99FF, 0x0004, 0x00EC, 0x00FA, 0x003C, 0x0004, 0x00AC, 0x001A, 0x009F, 0x0004, 0x2FFD, 0x0048, 0x007C,
+ 0x0004, 0x44CD, 0x00CA, 0x67FF, 0x0004, 0x1FFD, 0x002A, 0x444D, 0x0004, 0x00AD, 0x005A, 0x8CCF, 0x0004,
+ 0x4FFD, 0x0048, 0x445D, 0x0004, 0x01BD, 0x008A, 0x4EEF, 0x0004, 0x45DD, 0x00FA, 0x111D, 0x0004, 0x009C,
+ 0x001A, 0x222F, 0x0004, 0x8AED, 0x0048, 0x888D, 0x0004, 0x00DC, 0x00CA, 0xAFFF, 0x0004, 0xCFFD, 0x002A,
+ 0x003D, 0x0004, 0x00BC, 0x005A, 0x11BF, 0x0004, 0x8FFD, 0x0048, 0x006C, 0x0004, 0x027D, 0x008A, 0x22EF,
+ 0x0004, 0x00EC, 0x00FA, 0x003C, 0x0004, 0x00AC, 0x001A, 0x227F, 0x0004, 0x2FFD, 0x0048, 0x007C, 0x0004,
+ 0x44CD, 0x00CA, 0x5DFF, 0x0004, 0x1FFD, 0x002A, 0x444D, 0x0004, 0x00AD, 0x005A, 0x006F, 0x0004, 0x4FFD,
+ 0x0048, 0x445D, 0x0004, 0x01BD, 0x008A, 0x11DF, 0x0004, 0x45DD, 0x00FA, 0x111D, 0x0004, 0x009C, 0x001A,
+ 0x155F, 0x0006, 0x00FC, 0x0018, 0x111D, 0x0048, 0x888D, 0x00AA, 0x4DDF, 0x0006, 0x2AAD, 0x005A, 0x67FF,
+ 0x0028, 0x223D, 0x00BC, 0xAAAF, 0x0006, 0x00EC, 0x0018, 0x5FFF, 0x0048, 0x006C, 0x008A, 0xCCCF, 0x0006,
+ 0x009D, 0x00CA, 0x44EF, 0x0028, 0x003C, 0x8FFD, 0x137F, 0x0006, 0x8EED, 0x0018, 0x1FFF, 0x0048, 0x007C,
+ 0x00AA, 0x4CCF, 0x0006, 0x227D, 0x005A, 0x1DDF, 0x0028, 0x444D, 0x4FFD, 0x155F, 0x0006, 0x00DC, 0x0018,
+ 0x2EEF, 0x0048, 0x445D, 0x008A, 0x22BF, 0x0006, 0x009C, 0x00CA, 0x8CDF, 0x0028, 0x222D, 0x2FFD, 0x226F,
+ 0x0006, 0x00FC, 0x0018, 0x111D, 0x0048, 0x888D, 0x00AA, 0x1BBF, 0x0006, 0x2AAD, 0x005A, 0x33FF, 0x0028,
+ 0x223D, 0x00BC, 0x8AAF, 0x0006, 0x00EC, 0x0018, 0x9BFF, 0x0048, 0x006C, 0x008A, 0x8ABF, 0x0006, 0x009D,
+ 0x00CA, 0x4EEF, 0x0028, 0x003C, 0x8FFD, 0x466F, 0x0006, 0x8EED, 0x0018, 0xCFFF, 0x0048, 0x007C, 0x00AA,
+ 0x8CCF, 0x0006, 0x227D, 0x005A, 0xAEEF, 0x0028, 0x444D, 0x4FFD, 0x477F, 0x0006, 0x00DC, 0x0018, 0xAFFF,
+ 0x0048, 0x445D, 0x008A, 0x2BBF, 0x0006, 0x009C, 0x00CA, 0x44DF, 0x0028, 0x222D, 0x2FFD, 0x133F, 0x00F6,
+ 0xAFFD, 0x1FFB, 0x003C, 0x0008, 0x23BD, 0x007A, 0x11DF, 0x00F6, 0x45DD, 0x2FFB, 0x4EEF, 0x00DA, 0x177D,
+ 0xCFFD, 0x377F, 0x00F6, 0x3FFD, 0x8FFB, 0x111D, 0x0008, 0x009C, 0x005A, 0x1BBF, 0x00F6, 0x00CD, 0x00BA,
+ 0x8DDF, 0x4FFB, 0x006C, 0x9BFD, 0x455F, 0x00F6, 0x67FD, 0x1FFB, 0x002C, 0x0008, 0x00AC, 0x007A, 0x009F,
+ 0x00F6, 0x00AD, 0x2FFB, 0x7FFF, 0x00DA, 0x004C, 0x5FFD, 0x477F, 0x00F6, 0x00EC, 0x8FFB, 0x001C, 0x0008,
+ 0x008C, 0x005A, 0x888F, 0x00F6, 0x00CC, 0x00BA, 0x2EEF, 0x4FFB, 0x115D, 0x8AED, 0x113F, 0x00F6, 0xAFFD,
+ 0x1FFB, 0x003C, 0x0008, 0x23BD, 0x007A, 0x1DDF, 0x00F6, 0x45DD, 0x2FFB, 0xBFFF, 0x00DA, 0x177D, 0xCFFD,
+ 0x447F, 0x00F6, 0x3FFD, 0x8FFB, 0x111D, 0x0008, 0x009C, 0x005A, 0x277F, 0x00F6, 0x00CD, 0x00BA, 0x22EF,
+ 0x4FFB, 0x006C, 0x9BFD, 0x444F, 0x00F6, 0x67FD, 0x1FFB, 0x002C, 0x0008, 0x00AC, 0x007A, 0x11BF, 0x00F6,
+ 0x00AD, 0x2FFB, 0xFFFF, 0x00DA, 0x004C, 0x5FFD, 0x233F, 0x00F6, 0x00EC, 0x8FFB, 0x001C, 0x0008, 0x008C,
+ 0x005A, 0x006F, 0x00F6, 0x00CC, 0x00BA, 0x8BBF, 0x4FFB, 0x115D, 0x8AED, 0x222F};
+
+static const uint16_t dec_cxt_vlc_table0[1024] = {
+ 0x0026, 0x00AA, 0x0046, 0x006C, 0x0086, 0x8AED, 0x0018, 0x8DDF, 0x0026, 0x01BD, 0x0046, 0x5FFF, 0x0086,
+ 0x027D, 0x005A, 0x155F, 0x0026, 0x003A, 0x0046, 0x444D, 0x0086, 0x4CCD, 0x0018, 0xCCCF, 0x0026, 0x2EFD,
+ 0x0046, 0x99FF, 0x0086, 0x009C, 0x00CA, 0x133F, 0x0026, 0x00AA, 0x0046, 0x445D, 0x0086, 0x8CCD, 0x0018,
+ 0x11DF, 0x0026, 0x4FFD, 0x0046, 0xCFFF, 0x0086, 0x009D, 0x005A, 0x007E, 0x0026, 0x003A, 0x0046, 0x1FFF,
+ 0x0086, 0x88AD, 0x0018, 0x00BE, 0x0026, 0x8FFD, 0x0046, 0x4EEF, 0x0086, 0x888D, 0x00CA, 0x111F, 0x0026,
+ 0x00AA, 0x0046, 0x006C, 0x0086, 0x8AED, 0x0018, 0x45DF, 0x0026, 0x01BD, 0x0046, 0x22EF, 0x0086, 0x027D,
+ 0x005A, 0x227F, 0x0026, 0x003A, 0x0046, 0x444D, 0x0086, 0x4CCD, 0x0018, 0x11BF, 0x0026, 0x2EFD, 0x0046,
+ 0x00FE, 0x0086, 0x009C, 0x00CA, 0x223F, 0x0026, 0x00AA, 0x0046, 0x445D, 0x0086, 0x8CCD, 0x0018, 0x00DE,
+ 0x0026, 0x4FFD, 0x0046, 0xABFF, 0x0086, 0x009D, 0x005A, 0x006F, 0x0026, 0x003A, 0x0046, 0x6EFF, 0x0086,
+ 0x88AD, 0x0018, 0x2AAF, 0x0026, 0x8FFD, 0x0046, 0x00EE, 0x0086, 0x888D, 0x00CA, 0x222F, 0x0004, 0x00CA,
+ 0x0088, 0x027D, 0x0004, 0x4CCD, 0x0028, 0x00FE, 0x0004, 0x2AFD, 0x0048, 0x005C, 0x0004, 0x009D, 0x0018,
+ 0x00DE, 0x0004, 0x01BD, 0x0088, 0x006C, 0x0004, 0x88AD, 0x0028, 0x11DF, 0x0004, 0x8AED, 0x0048, 0x003C,
+ 0x0004, 0x888D, 0x0018, 0x111F, 0x0004, 0x00CA, 0x0088, 0x006D, 0x0004, 0x88CD, 0x0028, 0x88FF, 0x0004,
+ 0x8BFD, 0x0048, 0x444D, 0x0004, 0x009C, 0x0018, 0x00BE, 0x0004, 0x4EFD, 0x0088, 0x445D, 0x0004, 0x00AC,
+ 0x0028, 0x00EE, 0x0004, 0x45DD, 0x0048, 0x222D, 0x0004, 0x003D, 0x0018, 0x007E, 0x0004, 0x00CA, 0x0088,
+ 0x027D, 0x0004, 0x4CCD, 0x0028, 0x1FFF, 0x0004, 0x2AFD, 0x0048, 0x005C, 0x0004, 0x009D, 0x0018, 0x11BF,
+ 0x0004, 0x01BD, 0x0088, 0x006C, 0x0004, 0x88AD, 0x0028, 0x22EF, 0x0004, 0x8AED, 0x0048, 0x003C, 0x0004,
+ 0x888D, 0x0018, 0x227F, 0x0004, 0x00CA, 0x0088, 0x006D, 0x0004, 0x88CD, 0x0028, 0x4EEF, 0x0004, 0x8BFD,
+ 0x0048, 0x444D, 0x0004, 0x009C, 0x0018, 0x2AAF, 0x0004, 0x4EFD, 0x0088, 0x445D, 0x0004, 0x00AC, 0x0028,
+ 0x8DDF, 0x0004, 0x45DD, 0x0048, 0x222D, 0x0004, 0x003D, 0x0018, 0x155F, 0x0004, 0x005A, 0x0088, 0x006C,
+ 0x0004, 0x88DD, 0x0028, 0x23FF, 0x0004, 0x11FD, 0x0048, 0x444D, 0x0004, 0x00AD, 0x0018, 0x00BE, 0x0004,
+ 0x137D, 0x0088, 0x155D, 0x0004, 0x00CC, 0x0028, 0x00DE, 0x0004, 0x02ED, 0x0048, 0x111D, 0x0004, 0x009D,
+ 0x0018, 0x007E, 0x0004, 0x005A, 0x0088, 0x455D, 0x0004, 0x44CD, 0x0028, 0x00EE, 0x0004, 0x1FFD, 0x0048,
+ 0x003C, 0x0004, 0x00AC, 0x0018, 0x555F, 0x0004, 0x47FD, 0x0088, 0x113D, 0x0004, 0x02BD, 0x0028, 0x477F,
+ 0x0004, 0x4CDD, 0x0048, 0x8FFF, 0x0004, 0x009C, 0x0018, 0x222F, 0x0004, 0x005A, 0x0088, 0x006C, 0x0004,
+ 0x88DD, 0x0028, 0x00FE, 0x0004, 0x11FD, 0x0048, 0x444D, 0x0004, 0x00AD, 0x0018, 0x888F, 0x0004, 0x137D,
+ 0x0088, 0x155D, 0x0004, 0x00CC, 0x0028, 0x8CCF, 0x0004, 0x02ED, 0x0048, 0x111D, 0x0004, 0x009D, 0x0018,
+ 0x006F, 0x0004, 0x005A, 0x0088, 0x455D, 0x0004, 0x44CD, 0x0028, 0x1DDF, 0x0004, 0x1FFD, 0x0048, 0x003C,
+ 0x0004, 0x00AC, 0x0018, 0x227F, 0x0004, 0x47FD, 0x0088, 0x113D, 0x0004, 0x02BD, 0x0028, 0x22BF, 0x0004,
+ 0x4CDD, 0x0048, 0x22EF, 0x0004, 0x009C, 0x0018, 0x233F, 0x0006, 0x4DDD, 0x4FFB, 0xCFFF, 0x0018, 0x113D,
+ 0x005A, 0x888F, 0x0006, 0x23BD, 0x008A, 0x00EE, 0x002A, 0x155D, 0xAAFD, 0x277F, 0x0006, 0x44CD, 0x8FFB,
+ 0x44EF, 0x0018, 0x467D, 0x004A, 0x2AAF, 0x0006, 0x00AC, 0x555B, 0x99DF, 0x1FFB, 0x003C, 0x5FFD, 0x266F,
+ 0x0006, 0x1DDD, 0x4FFB, 0x6EFF, 0x0018, 0x177D, 0x005A, 0x1BBF, 0x0006, 0x88AD, 0x008A, 0x5DDF, 0x002A,
+ 0x444D, 0x2FFD, 0x667F, 0x0006, 0x00CC, 0x8FFB, 0x2EEF, 0x0018, 0x455D, 0x004A, 0x119F, 0x0006, 0x009C,
+ 0x555B, 0x8CCF, 0x1FFB, 0x111D, 0x8CED, 0x006E, 0x0006, 0x4DDD, 0x4FFB, 0x3FFF, 0x0018, 0x113D, 0x005A,
+ 0x11BF, 0x0006, 0x23BD, 0x008A, 0x8DDF, 0x002A, 0x155D, 0xAAFD, 0x222F, 0x0006, 0x44CD, 0x8FFB, 0x00FE,
+ 0x0018, 0x467D, 0x004A, 0x899F, 0x0006, 0x00AC, 0x555B, 0x00DE, 0x1FFB, 0x003C, 0x5FFD, 0x446F, 0x0006,
+ 0x1DDD, 0x4FFB, 0x9BFF, 0x0018, 0x177D, 0x005A, 0x00BE, 0x0006, 0x88AD, 0x008A, 0xCDDF, 0x002A, 0x444D,
+ 0x2FFD, 0x007E, 0x0006, 0x00CC, 0x8FFB, 0x4EEF, 0x0018, 0x455D, 0x004A, 0x377F, 0x0006, 0x009C, 0x555B,
+ 0x8BBF, 0x1FFB, 0x111D, 0x8CED, 0x233F, 0x0004, 0x00AA, 0x0088, 0x047D, 0x0004, 0x01DD, 0x0028, 0x11DF,
+ 0x0004, 0x27FD, 0x0048, 0x005C, 0x0004, 0x8AAD, 0x0018, 0x2BBF, 0x0004, 0x009C, 0x0088, 0x006C, 0x0004,
+ 0x00CC, 0x0028, 0x00EE, 0x0004, 0x8CED, 0x0048, 0x222D, 0x0004, 0x888D, 0x0018, 0x007E, 0x0004, 0x00AA,
+ 0x0088, 0x006D, 0x0004, 0x88CD, 0x0028, 0x00FE, 0x0004, 0x19FD, 0x0048, 0x003C, 0x0004, 0x2AAD, 0x0018,
+ 0xAAAF, 0x0004, 0x8BFD, 0x0088, 0x005D, 0x0004, 0x00BD, 0x0028, 0x4CCF, 0x0004, 0x44ED, 0x0048, 0x4FFF,
+ 0x0004, 0x223D, 0x0018, 0x111F, 0x0004, 0x00AA, 0x0088, 0x047D, 0x0004, 0x01DD, 0x0028, 0x99FF, 0x0004,
+ 0x27FD, 0x0048, 0x005C, 0x0004, 0x8AAD, 0x0018, 0x00BE, 0x0004, 0x009C, 0x0088, 0x006C, 0x0004, 0x00CC,
+ 0x0028, 0x00DE, 0x0004, 0x8CED, 0x0048, 0x222D, 0x0004, 0x888D, 0x0018, 0x444F, 0x0004, 0x00AA, 0x0088,
+ 0x006D, 0x0004, 0x88CD, 0x0028, 0x2EEF, 0x0004, 0x19FD, 0x0048, 0x003C, 0x0004, 0x2AAD, 0x0018, 0x447F,
+ 0x0004, 0x8BFD, 0x0088, 0x005D, 0x0004, 0x00BD, 0x0028, 0x009F, 0x0004, 0x44ED, 0x0048, 0x67FF, 0x0004,
+ 0x223D, 0x0018, 0x133F, 0x0006, 0x00CC, 0x008A, 0x9DFF, 0x2FFB, 0x467D, 0x1FFD, 0x99BF, 0x0006, 0x2AAD,
+ 0x002A, 0x66EF, 0x4FFB, 0x005C, 0x2EED, 0x377F, 0x0006, 0x89BD, 0x004A, 0x00FE, 0x8FFB, 0x006C, 0x67FD,
+ 0x889F, 0x0006, 0x888D, 0x001A, 0x5DDF, 0x00AA, 0x222D, 0x89DD, 0x444F, 0x0006, 0x2BBD, 0x008A, 0xCFFF,
+ 0x2FFB, 0x226D, 0x009C, 0x00BE, 0x0006, 0xAAAD, 0x002A, 0x1DDF, 0x4FFB, 0x003C, 0x4DDD, 0x466F, 0x0006,
+ 0x8AAD, 0x004A, 0xAEEF, 0x8FFB, 0x445D, 0x8EED, 0x177F, 0x0006, 0x233D, 0x001A, 0x4CCF, 0x00AA, 0xAFFF,
+ 0x88CD, 0x133F, 0x0006, 0x00CC, 0x008A, 0x77FF, 0x2FFB, 0x467D, 0x1FFD, 0x3BBF, 0x0006, 0x2AAD, 0x002A,
+ 0x00EE, 0x4FFB, 0x005C, 0x2EED, 0x007E, 0x0006, 0x89BD, 0x004A, 0x4EEF, 0x8FFB, 0x006C, 0x67FD, 0x667F,
+ 0x0006, 0x888D, 0x001A, 0x00DE, 0x00AA, 0x222D, 0x89DD, 0x333F, 0x0006, 0x2BBD, 0x008A, 0x57FF, 0x2FFB,
+ 0x226D, 0x009C, 0x199F, 0x0006, 0xAAAD, 0x002A, 0x99DF, 0x4FFB, 0x003C, 0x4DDD, 0x155F, 0x0006, 0x8AAD,
+ 0x004A, 0xCEEF, 0x8FFB, 0x445D, 0x8EED, 0x277F, 0x0006, 0x233D, 0x001A, 0x1BBF, 0x00AA, 0x3FFF, 0x88CD,
+ 0x111F, 0x0006, 0x45DD, 0x2FFB, 0x111D, 0x0018, 0x467D, 0x8FFD, 0xCCCF, 0x0006, 0x19BD, 0x004A, 0x22EF,
+ 0x002A, 0x222D, 0x3FFD, 0x888F, 0x0006, 0x00CC, 0x008A, 0x00FE, 0x0018, 0x115D, 0xCFFD, 0x8AAF, 0x0006,
+ 0x00AC, 0x003A, 0x8CDF, 0x1FFB, 0x133D, 0x66FD, 0x466F, 0x0006, 0x8CCD, 0x2FFB, 0x5FFF, 0x0018, 0x006C,
+ 0x4FFD, 0xABBF, 0x0006, 0x22AD, 0x004A, 0x00EE, 0x002A, 0x233D, 0xAEFD, 0x377F, 0x0006, 0x2BBD, 0x008A,
+ 0x55DF, 0x0018, 0x005C, 0x177D, 0x119F, 0x0006, 0x009C, 0x003A, 0x4CCF, 0x1FFB, 0x333D, 0x8EED, 0x444F,
+ 0x0006, 0x45DD, 0x2FFB, 0x111D, 0x0018, 0x467D, 0x8FFD, 0x99BF, 0x0006, 0x19BD, 0x004A, 0x2EEF, 0x002A,
+ 0x222D, 0x3FFD, 0x667F, 0x0006, 0x00CC, 0x008A, 0x4EEF, 0x0018, 0x115D, 0xCFFD, 0x899F, 0x0006, 0x00AC,
+ 0x003A, 0x00DE, 0x1FFB, 0x133D, 0x66FD, 0x226F, 0x0006, 0x8CCD, 0x2FFB, 0x9BFF, 0x0018, 0x006C, 0x4FFD,
+ 0x00BE, 0x0006, 0x22AD, 0x004A, 0x1DDF, 0x002A, 0x233D, 0xAEFD, 0x007E, 0x0006, 0x2BBD, 0x008A, 0xCEEF,
+ 0x0018, 0x005C, 0x177D, 0x277F, 0x0006, 0x009C, 0x003A, 0x8BBF, 0x1FFB, 0x333D, 0x8EED, 0x455F, 0x1FF9,
+ 0x1DDD, 0xAFFB, 0x00DE, 0x8FF9, 0x001C, 0xFFFB, 0x477F, 0x4FF9, 0x177D, 0x3FFB, 0x3BBF, 0x2FF9, 0xAEEF,
+ 0x8EED, 0x444F, 0x1FF9, 0x22AD, 0x000A, 0x8BBF, 0x8FF9, 0x00FE, 0xCFFD, 0x007E, 0x4FF9, 0x115D, 0x5FFB,
+ 0x577F, 0x2FF9, 0x8DDF, 0x2EED, 0x333F, 0x1FF9, 0x2BBD, 0xAFFB, 0x88CF, 0x8FF9, 0xBFFF, 0xFFFB, 0x377F,
+ 0x4FF9, 0x006D, 0x3FFB, 0x00BE, 0x2FF9, 0x66EF, 0x9FFD, 0x133F, 0x1FF9, 0x009D, 0x000A, 0xABBF, 0x8FF9,
+ 0xDFFF, 0x6FFD, 0x006E, 0x4FF9, 0x002C, 0x5FFB, 0x888F, 0x2FF9, 0xCDDF, 0x4DDD, 0x222F, 0x1FF9, 0x1DDD,
+ 0xAFFB, 0x4CCF, 0x8FF9, 0x001C, 0xFFFB, 0x277F, 0x4FF9, 0x177D, 0x3FFB, 0x99BF, 0x2FF9, 0xCEEF, 0x8EED,
+ 0x004E, 0x1FF9, 0x22AD, 0x000A, 0x00AE, 0x8FF9, 0x7FFF, 0xCFFD, 0x005E, 0x4FF9, 0x115D, 0x5FFB, 0x009E,
+ 0x2FF9, 0x5DDF, 0x2EED, 0x003E, 0x1FF9, 0x2BBD, 0xAFFB, 0x00CE, 0x8FF9, 0xEFFF, 0xFFFB, 0x667F, 0x4FF9,
+ 0x006D, 0x3FFB, 0x8AAF, 0x2FF9, 0x00EE, 0x9FFD, 0x233F, 0x1FF9, 0x009D, 0x000A, 0x1BBF, 0x8FF9, 0x4EEF,
+ 0x6FFD, 0x455F, 0x4FF9, 0x002C, 0x5FFB, 0x008E, 0x2FF9, 0x99DF, 0x4DDD, 0x111F};
diff --git a/libavcodec/jpeg2000htdec.h b/libavcodec/jpeg2000htdec.h
new file mode 100644
index 0000000000..62cf1450c2
--- /dev/null
+++ b/libavcodec/jpeg2000htdec.h
@@ -0,0 +1,28 @@
+/*
+* JPEG2000 High Throughput block decoder
+* Copyright (c) 2022 Caleb Etemesi <etemesicaleb at gmail.com>
+*
+* 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
+ */
+#ifndef AVCODEC_JPEG2000HTDEC_H
+#define AVCODEC_JPEG2000HTDEC_H
+
+#include "jpeg2000dec.h"
+
+int ff_jpeg2000_decode_htj2k(const Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty, Jpeg2000T1Context *t1, Jpeg2000Cblk *cblk, int width, int height, int magp, uint8_t roi_shift);
+
+#endif /* AVCODEC_JPEG2000HTDEC_H */
--
2.38.1
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