diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index c2b81ec103..5994e29ae3 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -42,6 +42,7 @@
 #include "jpeg2000.h"
 #include "jpeg2000dsp.h"
 #include "profiles.h"
+#include "jpeg2000dec.h"
 
 #define JP2_SIG_TYPE    0x6A502020
 #define JP2_SIG_VALUE   0x0D0A870A
@@ -51,93 +52,6 @@
 #define HAD_COC 0x01
 #define HAD_QCC 0x02
 
-#define MAX_POCS 32
-
-typedef struct Jpeg2000POCEntry {
-    uint16_t LYEpoc;
-    uint16_t CSpoc;
-    uint16_t CEpoc;
-    uint8_t RSpoc;
-    uint8_t REpoc;
-    uint8_t Ppoc;
-} Jpeg2000POCEntry;
-
-typedef struct Jpeg2000POC {
-    Jpeg2000POCEntry poc[MAX_POCS];
-    int nb_poc;
-    int is_default;
-} Jpeg2000POC;
-
-typedef struct Jpeg2000TilePart {
-    uint8_t tile_index;                 // Tile index who refers the tile-part
-    const uint8_t *tp_end;
-    GetByteContext header_tpg;          // bit stream of header if PPM header is used
-    GetByteContext tpg;                 // bit stream in tile-part
-} Jpeg2000TilePart;
-
-/* RMK: For JPEG2000 DCINEMA 3 tile-parts in a tile
- * one per component, so tile_part elements have a size of 3 */
-typedef struct Jpeg2000Tile {
-    Jpeg2000Component   *comp;
-    uint8_t             properties[4];
-    Jpeg2000CodingStyle codsty[4];
-    Jpeg2000QuantStyle  qntsty[4];
-    Jpeg2000POC         poc;
-    Jpeg2000TilePart    tile_part[32];
-    uint8_t             has_ppt;                // whether this tile has a ppt marker
-    uint8_t             *packed_headers;        // contains packed headers. Used only along with PPT marker
-    int                 packed_headers_size;    // size in bytes of the packed headers
-    GetByteContext      packed_headers_stream;  // byte context corresponding to packed headers
-    uint16_t tp_idx;                    // Tile-part index
-    int coord[2][2];                    // border coordinates {{x0, x1}, {y0, y1}}
-} Jpeg2000Tile;
-
-typedef struct Jpeg2000DecoderContext {
-    AVClass         *class;
-    AVCodecContext  *avctx;
-    GetByteContext  g;
-
-    int             width, height;
-    int             image_offset_x, image_offset_y;
-    int             tile_offset_x, tile_offset_y;
-    uint8_t         cbps[4];    // bits per sample in particular components
-    uint8_t         sgnd[4];    // if a component is signed
-    uint8_t         properties[4];
-
-    uint8_t         has_ppm;
-    uint8_t         *packed_headers; // contains packed headers. Used only along with PPM marker
-    int             packed_headers_size;
-    GetByteContext  packed_headers_stream;
-    uint8_t         in_tile_headers;
-
-    int             cdx[4], cdy[4];
-    int             precision;
-    int             ncomponents;
-    int             colour_space;
-    uint32_t        palette[256];
-    int8_t          pal8;
-    int             cdef[4];
-    int             tile_width, tile_height;
-    unsigned        numXtiles, numYtiles;
-    int             maxtilelen;
-    AVRational      sar;
-
-    Jpeg2000CodingStyle codsty[4];
-    Jpeg2000QuantStyle  qntsty[4];
-    Jpeg2000POC         poc;
-    uint8_t             roi_shift[4];
-
-    int             bit_index;
-
-    int             curtileno;
-
-    Jpeg2000Tile    *tile;
-    Jpeg2000DSPContext dsp;
-
-    /*options parameters*/
-    int             reduction_factor;
-} Jpeg2000DecoderContext;
-
 /* get_bits functions for JPEG2000 packet bitstream
  * It is a get_bit function with a bit-stuffing routine. If the value of the
  * byte is 0xFF, the next byte includes an extra zero bit stuffed into the MSB.
diff --git a/libavcodec/jpeg2000dec.h b/libavcodec/jpeg2000dec.h
new file mode 100644
index 0000000000..c148416889
--- /dev/null
+++ b/libavcodec/jpeg2000dec.h
@@ -0,0 +1,121 @@
+/*
+ * JPEG 2000 image decoder
+ * Copyright (c) 2007 Kamil Nowosad
+ * Copyright (c) 2013 Nicolas Bertrand <nicoinattendu@gmail.com>
+ * Copyright (c) 2022 Caleb Etemesi <etemesicaleb@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_JPEG2000DEC_H
+#define AVCODEC_JPEG2000DEC_H
+
+#include "bytestream.h"
+#include "jpeg2000.h"
+#include "jpeg2000dsp.h"
+
+
+#define MAX_POCS 32
+
+typedef struct Jpeg2000POCEntry {
+    uint16_t LYEpoc;
+    uint16_t CSpoc;
+    uint16_t CEpoc;
+    uint8_t RSpoc;
+    uint8_t REpoc;
+    uint8_t Ppoc;
+} Jpeg2000POCEntry;
+
+typedef struct Jpeg2000POC {
+    Jpeg2000POCEntry poc[MAX_POCS];
+    int nb_poc;
+    int is_default;
+} Jpeg2000POC;
+
+typedef struct Jpeg2000TilePart {
+    uint8_t tile_index;                 // Tile index who refers the tile-part
+    const uint8_t *tp_end;
+    GetByteContext header_tpg;          // bit stream of header if PPM header is used
+    GetByteContext tpg;                 // bit stream in tile-part
+} Jpeg2000TilePart;
+
+/* RMK: For JPEG2000 DCINEMA 3 tile-parts in a tile
+ * one per component, so tile_part elements have a size of 3 */
+typedef struct Jpeg2000Tile {
+    Jpeg2000Component   *comp;
+    uint8_t             properties[4];
+    Jpeg2000CodingStyle codsty[4];
+    Jpeg2000QuantStyle  qntsty[4];
+    Jpeg2000POC         poc;
+    Jpeg2000TilePart    tile_part[32];
+    uint8_t             has_ppt;                // whether this tile has a ppt marker
+    uint8_t             *packed_headers;        // contains packed headers. Used only along with PPT marker
+    int                 packed_headers_size;    // size in bytes of the packed headers
+    GetByteContext      packed_headers_stream;  // byte context corresponding to packed headers
+    uint16_t tp_idx;                    // Tile-part index
+    int coord[2][2];                    // border coordinates {{x0, x1}, {y0, y1}}
+} Jpeg2000Tile;
+
+typedef struct Jpeg2000DecoderContext {
+    AVClass         *class;
+    AVCodecContext  *avctx;
+    GetByteContext  g;
+
+    int             width, height;
+    int             image_offset_x, image_offset_y;
+    int             tile_offset_x, tile_offset_y;
+    uint8_t         cbps[4];    // bits per sample in particular components
+    uint8_t         sgnd[4];    // if a component is signed
+    uint8_t         properties[4];
+
+    uint8_t         has_ppm;
+    uint8_t         *packed_headers; // contains packed headers. Used only along with PPM marker
+    int             packed_headers_size;
+    GetByteContext  packed_headers_stream;
+    uint8_t         in_tile_headers;
+
+    int             cdx[4], cdy[4];
+    int             precision;
+    int             ncomponents;
+    int             colour_space;
+    uint32_t        palette[256];
+    int8_t          pal8;
+    int             cdef[4];
+    int             tile_width, tile_height;
+    unsigned        numXtiles, numYtiles;
+    int             maxtilelen;
+    AVRational      sar;
+
+    Jpeg2000CodingStyle codsty[4];
+    Jpeg2000QuantStyle  qntsty[4];
+    Jpeg2000POC         poc;
+    uint8_t             roi_shift[4];
+
+    int             bit_index;
+
+    int             curtileno;
+
+    Jpeg2000Tile    *tile;
+    Jpeg2000DSPContext dsp;
+
+    /*options parameters*/
+    int             reduction_factor;
+    /*HTJ2K params*/
+    uint8_t         is_htj2k;
+} Jpeg2000DecoderContext;
+
+#endif //AVCODEC_JPEG2000DEC_H
