/*
* Small jpeg decoder library (Internal header)
*
* Copyright (c) 2006, Luc Saillard <luc@saillard.org>
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* - Neither the name of the author nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef __TINYJPEG_INTERNAL_H_
#define __TINYJPEG_INTERNAL_H_
#include <setjmp.h>
#define SANITY_CHECK 1
struct jdec_private;
#define HUFFMAN_BITS_SIZE 256
#define HUFFMAN_HASH_NBITS 9
#define HUFFMAN_HASH_SIZE (1UL<<HUFFMAN_HASH_NBITS)
#define HUFFMAN_HASH_MASK (HUFFMAN_HASH_SIZE-1)
#define HUFFMAN_TABLES 4
#define COMPONENTS 3
#define JPEG_MAX_WIDTH 4096
#define JPEG_MAX_HEIGHT 4096
struct huffman_table
{
/* Fast look up table, using HUFFMAN_HASH_NBITS bits we can have directly the symbol,
* if the symbol is <0, then we need to look into the tree table */
short int lookup[HUFFMAN_HASH_SIZE];
/* code size: give the number of bits of a symbol is encoded */
unsigned char code_size[HUFFMAN_HASH_SIZE];
/* some place to store value that is not encoded in the lookup table
* FIXME: Calculate if 256 value is enough to store all values
*/
uint16_t slowtable[16-HUFFMAN_HASH_NBITS][256];
};
struct component
{
unsigned int Hfactor;
unsigned int Vfactor;
float *Q_table; /* Pointer to the quantisation table to use */
struct huffman_table *AC_table;
struct huffman_table *DC_table;
short int previous_DC; /* Previous DC coefficient */
short int DCT[64]; /* DCT coef */
#if SANITY_CHECK
unsigned int cid;
#endif
};
typedef void (*decode_MCU_fct) (struct jdec_private *priv);
typedef void (*convert_colorspace_fct) (struct jdec_private *priv, int, int);
struct jdec_private
{
/* Public variables */
uint8_t *components[COMPONENTS];
unsigned int bytes_per_row[COMPONENTS];
unsigned int width, height; /* Size of the image */
unsigned int flags;
/* Private variables */
const unsigned char *stream_begin, *stream_end;
unsigned int stream_length;
const unsigned char *stream; /* Pointer to the current stream */
unsigned int reservoir, nbits_in_reservoir;
struct component component_infos[COMPONENTS];
float Q_tables[COMPONENTS][64]; /* quantization tables */
struct huffman_table HTDC[HUFFMAN_TABLES]; /* DC huffman tables */
struct huffman_table HTAC[HUFFMAN_TABLES]; /* AC huffman tables */
int default_huffman_table_initialized;
int restart_interval;
int restarts_to_go; /* MCUs left in this restart interval */
int last_rst_marker_seen; /* Rst marker is incremented each time */
/* Temp space used after the IDCT to store each components */
uint8_t Y[64*4], Cr[64], Cb[64];
jmp_buf jump_state;
/* Internal Pointer use for colorspace conversion, do not modify it !!! */
uint8_t *plane[COMPONENTS];
};
#define IDCT tinyjpeg_idct_float
void tinyjpeg_idct_float (struct component *compptr, uint8_t *output_buf, int stride);
struct tinyjpeg_colorspace {
convert_colorspace_fct convert_colorspace[4];
const decode_MCU_fct *decode_mcu_table;
int (*initialize)(struct jdec_private *, unsigned int *, unsigned int *);
};
void tinyjpeg_process_Huffman_data_unit(struct jdec_private *priv, int component);
extern const decode_MCU_fct tinyjpeg_decode_mcu_3comp_table[4];
extern const decode_MCU_fct tinyjpeg_decode_mcu_1comp_table[4];
enum std_markers {
DQT = 0xDB, /* Define Quantization Table */
SOF = 0xC0, /* Start of Frame (size information) */
DHT = 0xC4, /* Huffman Table */
SOI = 0xD8, /* Start of Image */
SOS = 0xDA, /* Start of Scan */
RST = 0xD0, /* Reset Marker d0 -> .. */
RST7 = 0xD7, /* Reset Marker .. -> d7 */
EOI = 0xD9, /* End of Image */
DRI = 0xDD, /* Define Restart Interval */
APP0 = 0xE0,
};
#define cY 0
#define cCb 1
#define cCr 2
#define BLACK_Y 0
#define BLACK_U 127
#define BLACK_V 127
#define SANITY_CHECK 1
#if DEBUG
#define error(fmt, args...) do { \
snprintf(error_string, sizeof(error_string), fmt, ## args); \
return -1; \
} while(0)
#define trace(fmt, args...) do { \
fprintf(stderr, fmt, ## args); \
fflush(stderr); \
} while(0)
#else
#define error(fmt, args...) do { return -1; } while(0)
#define trace(fmt, args...) do { } while (0)
#endif
#ifndef __likely
# define __likely(x) (!!(x))
#endif
#ifndef __unlikely
# define __unlikely(x) (!!(x))
#endif
#define min(x, y) ((x) < (y) ? (x) : (y))
#define max(x, y) ((x) > (y) ? (x) : (y))
#if 0
static char *print_bits(unsigned int value, char *bitstr)
{
int i, j;
i=31;
while (i>0)
{
if (value & (1UL<<i))
break;
i--;
}
j=0;
while (i>=0)
{
bitstr[j++] = (value & (1UL<<i))?'1':'0';
i--;
}
bitstr[j] = 0;
return bitstr;
}
static void print_next_16bytes(int offset, const unsigned char *stream)
{
trace("%4.4x: %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
offset,
stream[0], stream[1], stream[2], stream[3],
stream[4], stream[5], stream[6], stream[7],
stream[8], stream[9], stream[10], stream[11],
stream[12], stream[13], stream[14], stream[15]);
}
#endif
#endif
