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quickwayne |
/* File : jpeg.h, header for all jpeg code */
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/* Author: Pierre Guerrier, march 1998 */
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/* */
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/* 19/01/99 Edited by Koen van Eijk */
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/*#define SPY*/
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/* Leave structures in memory,output something and dump core in the event
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of a failure: */
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#define DEBUG 0
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/*----------------------------------*/
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/* JPEG format parsing markers here */
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/*----------------------------------*/
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#define SOI_MK 0xFFD8 /* start of image */
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#define APP_MK 0xFFE0 /* custom, up to FFEF */
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#define COM_MK 0xFFFE /* commment segment */
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#define SOF_MK 0xFFC0 /* start of frame */
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#define SOS_MK 0xFFDA /* start of scan */
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#define DHT_MK 0xFFC4 /* Huffman table */
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#define DQT_MK 0xFFDB /* Quant. table */
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#define DRI_MK 0xFFDD /* restart interval */
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#define EOI_MK 0xFFD9 /* end of image */
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#define MK_MSK 0xFFF0
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#define RST_MK(x) ( (0xFFF8&(x)) == 0xFFD0 )
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/* is x a restart interval ? */
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/*-------------------------------------------------------- */
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/* all kinds of macros here */
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/*-------------------------------------------------------- */
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#define first_quad(c) ((c) >> 4) /* first 4 bits in file order */
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#define second_quad(c) ((c) & 15)
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#define HUFF_ID(hclass, id) (2 * (hclass) + (id))
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#define DC_CLASS 0
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#define AC_CLASS 1
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/*-------------------------------------------------------*/
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/* JPEG data types here */
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/*-------------------------------------------------------*/
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typedef union { /* block of pixel-space values */
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unsigned char block[8][8];
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unsigned char linear[64];
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} PBlock;
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typedef union { /* block of frequency-space values */
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int block[8][8];
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int linear[64];
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} FBlock;
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/* component descriptor structure */
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typedef struct {
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unsigned char CID; /* component ID */
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unsigned char IDX; /* index of first block in MCU */
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unsigned char HS; /* sampling factors */
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unsigned char VS;
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unsigned char HDIV; /* sample width ratios */
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unsigned char VDIV;
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char QT; /* QTable index, 2bits */
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char DC_HT; /* DC table index, 1bit */
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char AC_HT; /* AC table index, 1bit */
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int PRED; /* DC predictor value */
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} cd_t;
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/*--------------------------------------------*/
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/* global variables here */
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/*--------------------------------------------*/
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extern cd_t comp[3]; /* for every component, useful stuff */
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extern PBlock *MCU_buff[10]; /* decoded component buffer */
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/* between IDCT and color convert */
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extern int MCU_valid[10]; /* for every DCT block, component id then -1 */
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extern PBlock *QTable[4]; /* three quantization tables */
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extern int QTvalid[4]; /* at most, but seen as four ... */
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extern FILE *fi;
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extern FILE *fo;
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/* picture attributes */
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extern int x_size, y_size; /* Video frame size */
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extern int rx_size, ry_size; /* down-rounded Video frame size */
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/* in pixel units, multiple of MCU */
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extern int MCU_sx, MCU_sy; /* MCU size in pixels */
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extern int mx_size, my_size; /* picture size in units of MCUs */
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extern int n_comp; /* number of components 1,3 */
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/* processing cursor variables */
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extern int in_frame, curcomp, MCU_row, MCU_column;
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/* current position in MCU unit */
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/* RGB buffer storage */
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extern unsigned char *ColorBuffer; /* MCU after color conversion */
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extern unsigned char *FrameBuffer; /* complete final RGB image */
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extern PBlock *PBuff;
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extern FBlock *FBuff;
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/* process statistics */
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extern int stuffers; /* number of stuff bytes in file */
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extern int passed; /* number of bytes skipped looking for markers */
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extern int verbose;
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/*-----------------------------------------*/
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/* prototypes from utils.c */
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/*-----------------------------------------*/
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extern void show_FBlock(FBlock *S);
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extern void show_PBlock(PBlock *S);
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extern void bin_dump(FILE *fi);
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extern int ceil_div(int N, int D);
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extern int floor_div(int N, int D);
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extern void reset_prediction();
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extern int reformat(unsigned long S, int good);
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extern void free_structures();
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extern void suicide();
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extern void aborted_stream(FILE *fi);
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extern void RGB_save(FILE *fo);
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/*-----------------------------------------*/
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/* prototypes from parse.c */
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/*-----------------------------------------*/
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extern void clear_bits();
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extern unsigned long get_bits(FILE *fi, int number);
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extern unsigned char get_one_bit(FILE *fi);
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extern unsigned int get_size(FILE *fi);
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extern unsigned int get_next_MK(FILE *fi);
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extern int load_quant_tables(FILE *fi);
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extern int init_MCU();
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extern void skip_segment(FILE *fi);
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extern int process_MCU(FILE *fi);
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/*-------------------------------------------*/
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/* prototypes from fast_idct.c */
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/*-------------------------------------------*/
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extern void IDCT(const FBlock *S, PBlock *T);
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/*-----------------------------------------*/
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/* prototypes from color.c */
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/*-----------------------------------------*/
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extern void color_conversion();
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/*-------------------------------------------*/
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/* prototypes from table_vld.c or tree_vld.c */
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/*-------------------------------------------*/
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extern int load_huff_tables(FILE *fi);
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extern unsigned char get_symbol(FILE *fi, int select);
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/*-----------------------------------------*/
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/* prototypes from huffman.c */
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/*-----------------------------------------*/
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extern void unpack_block(FILE *fi, FBlock *T, int comp);
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/* unpack, predict, dequantize, reorder on store */
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/*-----------------------------------------*/
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/* prototypes from spy.c */
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/*-----------------------------------------*/
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extern void trace_bits(int number, int type);
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extern void output_stats(char *dumpfile);
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