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193 lines
4.7 KiB
C
193 lines
4.7 KiB
C
/* GStreamer
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* Copyright (C) 2010 Oblong Industries, Inc.
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* Copyright (C) 2010 Collabora Multimedia
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __JP2K_CODESTREAM_H__
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#define __JP2K_CODESTREAM_H__
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#include <gst/gst.h>
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#include <gst/base/gstbytereader.h>
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#include <gst/base/gstbitreader.h>
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#include <gst/base/gstbytewriter.h>
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#include "gstjp2kdecimator.h"
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/* Used to represent codestream packets */
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typedef struct
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{
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gboolean sop;
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gboolean eph;
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guint16 seqno;
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const guint8 *data;
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guint length;
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} Packet;
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/* Used to represent unparsed markers for passthrough */
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typedef struct
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{
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const guint8 *data;
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guint length;
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} Buffer;
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typedef struct
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{
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guint8 s; /* sample precision */
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guint8 xr, yr; /* resolution */
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} ComponentSize;
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/* SIZ */
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typedef struct
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{
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guint16 caps; /* capabilities */
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guint32 x, y; /* reference grid size */
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guint32 xo, yo; /* origin */
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ComponentSize *components;
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guint16 n_components;
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guint32 xt, yt; /* tile sizes */
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guint32 xto, yto; /* tile origin */
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} ImageSize;
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/* Progression orders
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* L - layer
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* R - resolution/decomposition level
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* C - component
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* P - position/precinct
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*/
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typedef enum
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{
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PROGRESSION_ORDER_LRCP = 0,
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PROGRESSION_ORDER_RLCP,
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PROGRESSION_ORDER_RPCL,
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PROGRESSION_ORDER_PCRL,
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PROGRESSION_ORDER_CPRL,
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PROGRESSION_ORDER_MAX
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} ProgressionOrder;
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/* COD */
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typedef struct
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{
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/* Scod */
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gboolean sop, eph;
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/* SGcod */
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ProgressionOrder progression_order;
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guint16 n_layers;
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guint8 multi_component_transform;
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/* SPcod */
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guint8 n_decompositions;
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guint8 xcb, ycb; /* code block dimensions */
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guint8 code_block_style;
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guint8 transformation;
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guint8 *PPx, *PPy; /* precinct sizes (default:15,
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* otherwise n_decompositions+1 elements) */
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} CodingStyleDefault;
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/* SOT */
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typedef struct
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{
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guint16 tile_index;
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guint32 tile_part_size;
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guint8 tile_part_index, n_tile_parts;
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} StartOfTile;
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/* PLT */
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typedef struct
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{
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guint8 index;
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GArray *packet_lengths; /* array of guint32 */
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} PacketLengthTilePart;
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typedef struct
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{
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StartOfTile sot;
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CodingStyleDefault *cod;
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Buffer *qcd;
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GList *qcc; /* list of Buffer */
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GList *plt; /* list of PacketLengthTilePart */
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GList *com; /* list of Buffer */
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GList *packets; /* list of Packet, codestream */
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/* TODO: COC, PPT */
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/* Calculated value */
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gint tile_x, tile_y;
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gint tx0, tx1, ty0, ty1; /* tile dimensions */
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} Tile;
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typedef struct
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{
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/* Parsed values */
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ImageSize siz;
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CodingStyleDefault cod;
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Buffer qcd;
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GList *qcc; /* list of Buffer */
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GList *crg, *com; /* lists of Buffer */
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/* TODO: COC, PPM, TLM, PLM */
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guint n_tiles_x, n_tiles_y, n_tiles; /* calculated */
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Tile *tiles;
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} MainHeader;
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typedef struct _PacketIterator PacketIterator;
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struct _PacketIterator
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{
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gboolean (*next) (PacketIterator * it);
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const MainHeader *header;
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const Tile *tile;
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gboolean first;
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gint cur_layer;
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gint cur_resolution;
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gint cur_component;
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gint cur_precinct;
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gint cur_x, cur_y;
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gint n_layers;
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gint n_resolutions;
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gint n_components;
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gint n_precincts, n_precincts_w, n_precincts_h;
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gint tx0, tx1, ty0, ty1;
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gint x_step, y_step;
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/* cached calculated values */
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/* depends on resolution and component */
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gint tcx0, tcx1, tcy0, tcy1;
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gint trx0, trx1, try0, try1;
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gint tpx0, tpx1, tpy0, tpy1;
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gint yr, xr;
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gint two_nl_r, two_ppx, two_ppy;
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gint cur_packet;
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};
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GstFlowReturn parse_main_header (GstJP2kDecimator * self, GstByteReader * reader, MainHeader * header);
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guint sizeof_main_header (GstJP2kDecimator * self, const MainHeader * header);
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void reset_main_header (GstJP2kDecimator * self, MainHeader * header);
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GstFlowReturn write_main_header (GstJP2kDecimator * self, GstByteWriter * writer, const MainHeader * header);
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GstFlowReturn decimate_main_header (GstJP2kDecimator * self, MainHeader * header);
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#endif /* __JP2K_CODESTREAM_H__ */
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