JPEG 2000 decoder for DCinema

Based on the 2007 GSoC project from Kamil Nowosad <k.nowosad@students.mimuw.edu.pl>
Updated to current programming standards, style and many more small
fixes by Diego Biurrun <diego@biurrun.de>.
Signed-off-by: Diego Biurrun <diego@biurrun.de>

Changelog

@@ -11,6 +11,7 @@ version 10:
   filtergraph description to be read from a file
 - uniform options syntax across all filters
 - new interlace filter
+- JPEG 2000 decoder
 
 
 version 9:

doc/general.texi

@@ -373,8 +373,8 @@ following image formats are supported:
     @tab Digital Picture Exchange
 @item JPEG         @tab X @tab X
     @tab Progressive JPEG is not supported.
-@item JPEG 2000    @tab E @tab E
-    @tab decoding supported through external library libopenjpeg
+@item JPEG 2000    @tab E @tab X
+    @tab encoding supported through external library libopenjpeg
 @item JPEG-LS      @tab X @tab X
 @item LJPEG        @tab X @tab
     @tab Lossless JPEG

libavcodec/Makefile

@@ -205,6 +205,8 @@ OBJS-$(CONFIG_INDEO4_DECODER)          += indeo4.o ivi_common.o ivi_dsp.o
 OBJS-$(CONFIG_INDEO5_DECODER)          += indeo5.o ivi_common.o ivi_dsp.o
 OBJS-$(CONFIG_INTERPLAY_DPCM_DECODER)  += dpcm.o
 OBJS-$(CONFIG_INTERPLAY_VIDEO_DECODER) += interplayvideo.o
+OBJS-$(CONFIG_JPEG2000_DECODER)        += jpeg2000dec.o jpeg2000.o      \
+                                          jpeg2000dwt.o mqcdec.o mqc.o
 OBJS-$(CONFIG_JPEGLS_DECODER)          += jpeglsdec.o jpegls.o \
                                           mjpegdec.o mjpeg.o
 OBJS-$(CONFIG_JPEGLS_ENCODER)          += jpeglsenc.o jpegls.o

libavcodec/allcodecs.c

@@ -160,6 +160,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER(INDEO4,            indeo4);
     REGISTER_DECODER(INDEO5,            indeo5);
     REGISTER_DECODER(INTERPLAY_VIDEO,   interplay_video);
+    REGISTER_DECODER(JPEG2000,          jpeg2000);
     REGISTER_ENCDEC (JPEGLS,            jpegls);
     REGISTER_DECODER(JV,                jv);
     REGISTER_DECODER(KGV1,              kgv1);

libavcodec/avcodec.h

@@ -2570,6 +2570,12 @@ typedef struct AVCodecContext {
 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO             14
 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE           15
 
+#define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0   0
+#define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1   1
+#define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION  2
+#define FF_PROFILE_JPEG2000_DCINEMA_2K              3
+#define FF_PROFILE_JPEG2000_DCINEMA_4K              4
+
     /**
      * level
      * - encoding: Set by user.

libavcodec/jpeg2000.h

+/*
+ * JPEG 2000 common defines, structures and functions
+ * Copyright (c) 2007 Kamil Nowosad
+ * Copyright (c) 2013 Nicolas Bertrand <nicoinattendu@gmail.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_JPEG2000_H
+#define AVCODEC_JPEG2000_H
+
+/**
+ * @file
+ * JPEG 2000 structures and defines common
+ * to encoder and decoder
+ */
+
+#include <stdint.h>
+
+#include "avcodec.h"
+#include "mqc.h"
+#include "jpeg2000dwt.h"
+
+enum Jpeg2000Markers {
+    JPEG2000_SOC = 0xff4f, // start of codestream
+    JPEG2000_SIZ = 0xff51, // image and tile size
+    JPEG2000_COD,          // coding style default
+    JPEG2000_COC,          // coding style component
+    JPEG2000_TLM = 0xff55, // packed packet headers, tile-part header
+    JPEG2000_PLM = 0xff57, // tile-part lengths
+    JPEG2000_PLT,          // packet length, main header
+    JPEG2000_QCD = 0xff5c, // quantization default
+    JPEG2000_QCC,          // quantization component
+    JPEG2000_RGN,          // region of interest
+    JPEG2000_POC,          // progression order change
+    JPEG2000_PPM,          // packet length, tile-part header
+    JPEG2000_PPT,          // packed packet headers, main header
+    JPEG2000_CRG = 0xff63, // component registration
+    JPEG2000_COM,          // comment
+    JPEG2000_SOT = 0xff90, // start of tile-part
+    JPEG2000_SOP,          // start of packet
+    JPEG2000_EPH,          // end of packet header
+    JPEG2000_SOD,          // start of data
+    JPEG2000_EOC = 0xffd9, // end of codestream
+};
+
+enum Jpeg2000Quantsty { // quantization style
+    JPEG2000_QSTY_NONE, // no quantization
+    JPEG2000_QSTY_SI,   // scalar derived
+    JPEG2000_QSTY_SE    // scalar expounded
+};
+
+#define JPEG2000_MAX_CBLKW 64
+#define JPEG2000_MAX_CBLKH 64
+
+#define JPEG2000_MAX_RESLEVELS 33
+
+// T1 flags
+// flags determining significance of neighbor coefficients
+#define JPEG2000_T1_SIG_N  0x0001
+#define JPEG2000_T1_SIG_E  0x0002
+#define JPEG2000_T1_SIG_W  0x0004
+#define JPEG2000_T1_SIG_S  0x0008
+#define JPEG2000_T1_SIG_NE 0x0010
+#define JPEG2000_T1_SIG_NW 0x0020
+#define JPEG2000_T1_SIG_SE 0x0040
+#define JPEG2000_T1_SIG_SW 0x0080
+#define JPEG2000_T1_SIG_NB (JPEG2000_T1_SIG_N  | JPEG2000_T1_SIG_E  |   \
+                            JPEG2000_T1_SIG_S  | JPEG2000_T1_SIG_W  |   \
+                            JPEG2000_T1_SIG_NE | JPEG2000_T1_SIG_NW |   \
+                            JPEG2000_T1_SIG_SE | JPEG2000_T1_SIG_SW)
+// flags determining sign bit of neighbor coefficients
+#define JPEG2000_T1_SGN_N  0x0100
+#define JPEG2000_T1_SGN_S  0x0200
+#define JPEG2000_T1_SGN_W  0x0400
+#define JPEG2000_T1_SGN_E  0x0800
+
+#define JPEG2000_T1_VIS    0x1000
+#define JPEG2000_T1_SIG    0x2000
+#define JPEG2000_T1_REF    0x4000
+
+#define JPEG2000_T1_SGN    0x8000
+
+// Codeblock coding styles
+#define JPEG2000_CBLK_BYPASS    0x01 // Selective arithmetic coding bypass
+#define JPEG2000_CBLK_RESET     0x02 // Reset context probabilities
+#define JPEG2000_CBLK_TERMALL   0x04 // Terminate after each coding pass
+#define JPEG2000_CBLK_VSC       0x08 // Vertical stripe causal context formation
+#define JPEG2000_CBLK_PREDTERM  0x10 // Predictable termination
+#define JPEG2000_CBLK_SEGSYM    0x20 // Segmentation symbols present
+
+// Coding styles
+#define JPEG2000_CSTY_PREC      0x01 // Precincts defined in coding style
+#define JPEG2000_CSTY_SOP       0x02 // SOP marker present
+#define JPEG2000_CSTY_EPH       0x04 // EPH marker present
+
+// Progression orders
+#define JPEG2000_PGOD_LRCP      0x00  // Layer-resolution level-component-position progression
+#define JPEG2000_PGOD_RLCP      0x01  // Resolution level-layer-component-position progression
+#define JPEG2000_PGOD_RPCL      0x02  // Resolution level-position-component-layer progression
+#define JPEG2000_PGOD_PCRL      0x03  // Position-component-resolution level-layer progression
+#define JPEG2000_PGOD_CPRL      0x04  // Component-position-resolution level-layer progression
+
+typedef struct Jpeg2000T1Context {
+    int data[JPEG2000_MAX_CBLKW][JPEG2000_MAX_CBLKH];
+    int flags[JPEG2000_MAX_CBLKW + 2][JPEG2000_MAX_CBLKH + 2];
+    MqcState mqc;
+} Jpeg2000T1Context;
+
+typedef struct Jpeg2000TgtNode {
+    uint8_t val;
+    uint8_t vis;
+    struct Jpeg2000TgtNode *parent;
+} Jpeg2000TgtNode;
+
+typedef struct Jpeg2000CodingStyle {
+    uint8_t nreslevels;       // number of resolution levels
+    uint8_t nreslevels2decode; // number of resolution levels to decode
+    uint8_t log2_cblk_width,
+            log2_cblk_height; // exponent of codeblock size
+    uint8_t transform;        // DWT type
+    uint8_t csty;             // coding style
+    uint8_t log2_prec_width,
+            log2_prec_height; // precinct size
+    uint8_t nlayers;          // number of layers
+    uint8_t mct;              // multiple component transformation
+    uint8_t cblk_style;       // codeblock coding style
+    uint8_t prog_order;       // progression order
+    uint8_t log2_prec_widths[JPEG2000_MAX_RESLEVELS];  // precincts size according resolution levels
+    uint8_t log2_prec_heights[JPEG2000_MAX_RESLEVELS]; // TODO: initialize prec_size array with 0?
+} Jpeg2000CodingStyle;
+
+typedef struct Jpeg2000QuantStyle {
+    uint8_t expn[32 * 3];  // quantization exponent
+    uint32_t mant[32 * 3]; // quantization mantissa
+    uint8_t quantsty;      // quantization style
+    uint8_t nguardbits;    // number of guard bits
+} Jpeg2000QuantStyle;
+
+typedef struct Jpeg2000Pass {
+    uint16_t rate;
+    int64_t disto;
+} Jpeg2000Pass;
+
+typedef struct Jpeg2000Cblk {
+    uint8_t npasses;
+    uint8_t ninclpasses; // number coding of passes included in codestream
+    uint8_t nonzerobits;
+    uint16_t length;
+    uint16_t lengthinc;
+    uint8_t lblock;
+    uint8_t zero;
+    uint8_t data[8192];
+    Jpeg2000Pass passes[100];
+    uint16_t coord[2][2]; // border coordinates {{x0, x1}, {y0, y1}}
+} Jpeg2000Cblk; // code block
+
+typedef struct Jpeg2000Prec {
+    uint16_t xi0, yi0; // codeblock indexes ([xi0, xi1))
+    uint16_t nb_codeblocks_width;
+    uint16_t nb_codeblocks_height;
+    Jpeg2000TgtNode *zerobits;
+    Jpeg2000TgtNode *cblkincl;
+    Jpeg2000Cblk *cblk;
+    uint16_t coord[2][2]; // border coordinates {{x0, x1}, {y0, y1}}
+} Jpeg2000Prec; // precinct
+
+/* TODO: stepsize can be float or integer depending on
+ * reversible or irreversible transformation. */
+typedef struct Jpeg2000Band {
+    uint16_t coord[2][2]; // border coordinates {{x0, x1}, {y0, y1}}
+    uint16_t log2_cblk_width, log2_cblk_height;
+    uint16_t cblknx, cblkny;
+    float stepsize; // quantization stepsize
+    Jpeg2000Prec *prec;
+} Jpeg2000Band; // subband
+
+typedef struct Jpeg2000ResLevel {
+    uint8_t nbands;
+    uint16_t coord[2][2]; // border coordinates {{x0, x1}, {y0, y1}}
+    uint16_t num_precincts_x, num_precincts_y; // number of precincts in x/y direction
+    uint8_t log2_prec_width, log2_prec_height; // exponent of precinct size
+    Jpeg2000Band *band;
+} Jpeg2000ResLevel; // resolution level
+
+/* TODO: data can be float of integer depending of reversible/irreversible
+ * transformation.
+ */
+typedef struct Jpeg2000Component {
+    Jpeg2000ResLevel *reslevel;
+    DWTContext dwt;
+    float *data;
+    uint16_t coord[2][2];   // border coordinates {{x0, x1}, {y0, y1}} -- can be reduced with lowres option
+    uint16_t coord_o[2][2]; // border coordinates {{x0, x1}, {y0, y1}} -- original values from jpeg2000 headers
+} Jpeg2000Component;
+
+/* misc tools */
+static inline int ff_jpeg2000_ceildivpow2(int a, int b)
+{
+    return (a + (1 << b) - 1) >> b;
+}
+
+static inline int ff_jpeg2000_ceildiv(int a, int b)
+{
+    return (a + b - 1) / b;
+}
+
+/* TIER-1 routines */
+
+/* Set up lookup tables used in TIER-1. */
+void ff_jpeg2000_init_tier1_luts(void);
+
+/* Update significance of a coefficient at current position (x,y) and
+ * for neighbors. */
+void ff_jpeg2000_set_significance(Jpeg2000T1Context *t1,
+                                  int x, int y, int negative);
+
+extern uint8_t ff_jpeg2000_sigctxno_lut[256][4];
+
+/* Get context label (number in range[0..8]) of a coefficient for significance
+ * propagation and cleanup coding passes. */
+static inline int ff_jpeg2000_getsigctxno(int flag, int bandno)
+{
+    return ff_jpeg2000_sigctxno_lut[flag & 255][bandno];
+}
+
+static const uint8_t refctxno_lut[2][2] = { { 14, 15 }, { 16, 16 } };
+
+/* Get context label (number in range[14..16]) of a coefficient for magnitude
+ * refinement pass. */
+static inline int ff_jpeg2000_getrefctxno(int flag)
+{
+    return refctxno_lut[(flag >> 14) & 1][(flag & 255) != 0];
+}
+
+extern uint8_t ff_jpeg2000_sgnctxno_lut[16][16];
+extern uint8_t ff_jpeg2000_xorbit_lut[16][16];
+
+/* Get context label (number in range[9..13]) for sign decoding. */
+static inline int ff_jpeg2000_getsgnctxno(int flag, int *xorbit)
+{
+    *xorbit = ff_jpeg2000_xorbit_lut[flag & 15][(flag >> 8) & 15];
+    return ff_jpeg2000_sgnctxno_lut[flag & 15][(flag >> 8) & 15];
+}
+
+int ff_jpeg2000_init_component(Jpeg2000Component *comp,
+                               Jpeg2000CodingStyle *codsty,
+                               Jpeg2000QuantStyle *qntsty,
+                               int cbps, int dx, int dy,
+                               AVCodecContext *ctx);
+
+void ff_jpeg2000_cleanup(Jpeg2000Component *comp, Jpeg2000CodingStyle *codsty);
+
+#endif /* AVCODEC_JPEG2000_H */

libavcodec/jpeg2000dwt.h

+/*
+ * Discrete wavelet transform
+ * Copyright (c) 2007 Kamil Nowosad
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_JPEG2000DWT_H
+#define AVCODEC_JPEG2000DWT_H
+
+/**
+ * @file
+ * Discrete wavelet transform
+ */
+
+#include <stdint.h>
+
+#define FF_DWT_MAX_DECLVLS 32 ///< max number of decomposition levels
+
+enum DWTType {
+    FF_DWT97,
+    FF_DWT53,
+    FF_DWT97_INT
+};
+
+typedef struct DWTContext {
+    /// line lengths { horizontal, vertical } in consecutive decomposition levels
+    uint16_t linelen[FF_DWT_MAX_DECLVLS][2];
+    uint8_t mod[FF_DWT_MAX_DECLVLS][2];  ///< coordinates (x0, y0) of decomp. levels mod 2
+    uint8_t ndeclevels;                  ///< number of decomposition levels
+    uint8_t type;                        ///< 0 for 9/7; 1 for 5/3
+    int32_t *i_linebuf;                  ///< int buffer used by transform
+    float   *f_linebuf;                  ///< float buffer used by transform
+} DWTContext;
+
+/**
+ * Initialize DWT.
+ * @param s                 DWT context
+ * @param border            coordinates of transformed region {{x0, x1}, {y0, y1}}
+ * @param decomp_levels     number of decomposition levels
+ * @param type              0 for DWT 9/7; 1 for DWT 5/3
+ */
+int ff_jpeg2000_dwt_init(DWTContext *s, uint16_t border[2][2],
+                         int decomp_levels, int type);
+
+int ff_dwt_decode(DWTContext *s, void *t);
+
+void ff_dwt_destroy(DWTContext *s);
+
+#endif /* AVCODEC_JPEG2000DWT_H */

libavcodec/mqc.c

+/*
+ * MQ-coder encoder and decoder common functions
+ * Copyright (c) 2007 Kamil Nowosad
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * MQ-coder common (decoder/encoder) functions
+ * @file
+ * @author Kamil Nowosad
+ */
+
+#include <string.h>
+#include <stdint.h>
+
+#include "mqc.h"
+
+/* MQ coder context state structure */
+typedef struct MqcCxState {
+    uint16_t qe;
+    uint8_t  nmps;
+    uint8_t  nlps;
+    uint8_t  sw;
+} MqcCxState;
+
+static const MqcCxState cx_states[47] = {
+    { 0x5601,  1,  1, 1 },
+    { 0x3401,  2,  6, 0 },
+    { 0x1801,  3,  9, 0 },
+    { 0x0AC1,  4, 12, 0 },
+    { 0x0521,  5, 29, 0 },
+    { 0x0221, 38, 33, 0 },
+    { 0x5601,  7,  6, 1 },
+    { 0x5401,  8, 14, 0 },
+    { 0x4801,  9, 14, 0 },
+    { 0x3801, 10, 14, 0 },
+    { 0x3001, 11, 17, 0 },
+    { 0x2401, 12, 18, 0 },
+    { 0x1C01, 13, 20, 0 },
+    { 0x1601, 29, 21, 0 },
+    { 0x5601, 15, 14, 1 },
+    { 0x5401, 16, 14, 0 },
+    { 0x5101, 17, 15, 0 },
+    { 0x4801, 18, 16, 0 },
+    { 0x3801, 19, 17, 0 },
+    { 0x3401, 20, 18, 0 },
+    { 0x3001, 21, 19, 0 },
+    { 0x2801, 22, 19, 0 },
+    { 0x2401, 23, 20, 0 },
+    { 0x2201, 24, 21, 0 },
+    { 0x1C01, 25, 22, 0 },
+    { 0x1801, 26, 23, 0 },
+    { 0x1601, 27, 24, 0 },
+    { 0x1401, 28, 25, 0 },
+    { 0x1201, 29, 26, 0 },
+    { 0x1101, 30, 27, 0 },
+    { 0x0AC1, 31, 28, 0 },
+    { 0x09C1, 32, 29, 0 },
+    { 0x08A1, 33, 30, 0 },
+    { 0x0521, 34, 31, 0 },
+    { 0x0441, 35, 32, 0 },
+    { 0x02A1, 36, 33, 0 },
+    { 0x0221, 37, 34, 0 },
+    { 0x0141, 38, 35, 0 },
+    { 0x0111, 39, 36, 0 },
+    { 0x0085, 40, 37, 0 },
+    { 0x0049, 41, 38, 0 },
+    { 0x0025, 42, 39, 0 },
+    { 0x0015, 43, 40, 0 },
+    { 0x0009, 44, 41, 0 },
+    { 0x0005, 45, 42, 0 },
+    { 0x0001, 45, 43, 0 },
+    { 0x5601, 46, 46, 0 }
+};
+
+uint16_t ff_mqc_qe [2 * 47];
+uint8_t ff_mqc_nlps[2 * 47];
+uint8_t ff_mqc_nmps[2 * 47];
+
+void ff_mqc_init_contexts(MqcState *mqc)
+{
+    int i;
+    memset(mqc->cx_states, 0, sizeof(mqc->cx_states));
+    mqc->cx_states[MQC_CX_UNI] = 2 * 46;
+    mqc->cx_states[MQC_CX_RL]  = 2 * 3;
+    mqc->cx_states[0]          = 2 * 4;
+
+    for (i = 0; i < 47; i++) {
+        ff_mqc_qe[2 * i]     =
+        ff_mqc_qe[2 * i + 1] = cx_states[i].qe;
+
+        ff_mqc_nlps[2 * i]     = 2 * cx_states[i].nlps + cx_states[i].sw;
+        ff_mqc_nlps[2 * i + 1] = 2 * cx_states[i].nlps + 1 - cx_states[i].sw;
+        ff_mqc_nmps[2 * i]     = 2 * cx_states[i].nmps;
+        ff_mqc_nmps[2 * i + 1] = 2 * cx_states[i].nmps + 1;
+    }
+}

libavcodec/mqc.h

+/*
+ * MQ-coder: structures, common and decoder functions
+ * Copyright (c) 2007 Kamil Nowosad
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_MQC_H
+#define AVCODEC_MQC_H
+
+/**
+ * MQ-coder
+ * @file
+ * @author Kamil Nowosad
+ */
+
+#include <stdint.h>
+
+#define MQC_CX_UNI 17
+#define MQC_CX_RL  18
+
+extern uint16_t ff_mqc_qe[2 * 47];
+extern uint8_t  ff_mqc_nlps[2 * 47];
+extern uint8_t  ff_mqc_nmps[2 * 47];
+
+typedef struct MqcState {
+    uint8_t *bp, *bpstart;
+    unsigned int a;
+    unsigned int c;
+    unsigned int ct;
+    uint8_t cx_states[19];
+} MqcState;
+
+/* decoder */
+
+/**
+ * Initialize MQ-decoder.
+ * @param mqc   MQ decoder state
+ * @param bp    byte poiter
+ */
+void ff_mqc_initdec(MqcState *mqc, uint8_t *bp);
+
+/**
+ * MQ decoder.
+ * @param mqc       MQ decoder state
+ * @param cxstate   Context
+ * @return          Decision (0 ot 1)
+ */
+int ff_mqc_decode(MqcState *mqc, uint8_t *cxstate);
+
+/* common */
+
+/**
+ * MQ-coder context initialisations.
+ * @param mqc       MQ-coder context
+ */
+void ff_mqc_init_contexts(MqcState *mqc);
+
+#endif /* AVCODEC_MQC_H */

libavcodec/mqcdec.c

+/*
+ * MQ-coder decoder
+ * Copyright (c) 2007 Kamil Nowosad
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * MQ-coder decoder
+ * @file
+ * @author Kamil Nowosad
+ */
+
+#include "mqc.h"
+
+static void bytein(MqcState *mqc)
+{
+    if (*mqc->bp == 0xff) {
+        if (*(mqc->bp + 1) > 0x8f)
+            mqc->c++;
+        else {
+            mqc->bp++;
+            mqc->c += 2 + 0xfe00 - (*mqc->bp << 9);
+        }
+    } else {
+        mqc->bp++;
+        mqc->c += 1 + 0xff00 - (*mqc->bp << 8);
+    }
+}
+
+static int exchange(MqcState *mqc, uint8_t *cxstate, int lps)
+{
+    int d;
+    if ((mqc->a < ff_mqc_qe[*cxstate]) ^ (!lps)) {
+        if (lps)
+            mqc->a = ff_mqc_qe[*cxstate];
+        d = *cxstate & 1;
+        *cxstate = ff_mqc_nmps[*cxstate];
+    } else {
+        if (lps)
+            mqc->a = ff_mqc_qe[*cxstate];
+        d = 1 - (*cxstate & 1);
+        *cxstate = ff_mqc_nlps[*cxstate];
+    }
+    // do RENORMD: see ISO/IEC 15444-1:2002 §C.3.3
+    do {
+        if (!(mqc->c & 0xff)) {
+            mqc->c -= 0x100;
+            bytein(mqc);
+        }
+        mqc->a += mqc->a;
+        mqc->c += mqc->c;
+    } while (!(mqc->a & 0x8000));
+    return d;
+}
+
+void ff_mqc_initdec(MqcState *mqc, uint8_t *bp)
+{
+    ff_mqc_init_contexts(mqc);
+    mqc->bp = bp;
+    mqc->c  = (*mqc->bp ^ 0xff) << 16;
+    bytein(mqc);
+    mqc->c = mqc->c << 7;
+    mqc->a = 0x8000;
+}
+
+int ff_mqc_decode(MqcState *mqc, uint8_t *cxstate)
+{
+    mqc->a -= ff_mqc_qe[*cxstate];
+    if ((mqc->c >> 16) < mqc->a) {
+        if (mqc->a & 0x8000)
+            return *cxstate & 1;
+        else
+            return exchange(mqc, cxstate, 0);
+    } else {
+        mqc->c -= mqc->a << 16;
+        return exchange(mqc, cxstate, 1);
+    }
+}

tests/fate/video.mak

@@ -151,6 +151,9 @@ fate-interplay-mve-8bit: CMD = framecrc -i $(SAMPLES)/interplay-mve/interplay-lo
 FATE_SAMPLES_AVCONV-$(call DEMDEC, IPMOVIE, INTERPLAY_VIDEO) += fate-interplay-mve-16bit
 fate-interplay-mve-16bit: CMD = framecrc -i $(SAMPLES)/interplay-mve/descent3-level5-16bit-partial.mve -pix_fmt rgb24 -an
 
+FATE_SAMPLES_AVCONV-$(call DEMDEC, MXF, JPEG2000) += fate-jpeg2000-dcinema
+fate-jpeg2000-dcinema: CMD = framecrc -flags +bitexact -i $(SAMPLES)/jpeg2000/chiens_dcinema2K.mxf
+
 FATE_SAMPLES_AVCONV-$(call DEMDEC, AVI, KGV1) += fate-kgv1
 fate-kgv1: CMD = framecrc -i $(SAMPLES)/kega/kgv1.avi -pix_fmt rgb555le -an
 

tests/ref/fate/jpeg2000-dcinema

+#tb 0: 1/24
+0,          0,          0,        1, 12441600, 0xf0de508b
+0,          1,          1,        1, 12441600, 0x8e50c249