path: root/src/c_marker.c

/*
 * jcmarker.c
 *
 * Copyright (C) 1991-1998, Thomas G. Lane.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This file contains routines to write JPEG datastream markers.
 */

#include <stdlib.h>
#include <stdio.h>

#include "morecfg.h"
#include "jpeglib.h"

typedef enum {			/* JPEG marker codes */
  M_SOF0  = 0xc0,
  M_SOF1  = 0xc1,
  M_SOF2  = 0xc2,
  M_SOF3  = 0xc3,
  
  M_SOF5  = 0xc5,
  M_SOF6  = 0xc6,
  M_SOF7  = 0xc7,
  
  M_JPG   = 0xc8,
  M_SOF9  = 0xc9,
  M_SOF10 = 0xca,
  M_SOF11 = 0xcb,
  
  M_SOF13 = 0xcd,
  M_SOF14 = 0xce,
  M_SOF15 = 0xcf,
  
  M_DHT   = 0xc4,
  
  M_DAC   = 0xcc,
  
  M_RST0  = 0xd0,
  M_RST1  = 0xd1,
  M_RST2  = 0xd2,
  M_RST3  = 0xd3,
  M_RST4  = 0xd4,
  M_RST5  = 0xd5,
  M_RST6  = 0xd6,
  M_RST7  = 0xd7,
  
  M_SOI   = 0xd8,
  M_EOI   = 0xd9,
  M_SOS   = 0xda,
  M_DQT   = 0xdb,
  M_DNL   = 0xdc,
  M_DRI   = 0xdd,
  M_DHP   = 0xde,
  M_EXP   = 0xdf,
  
  M_APP0  = 0xe0,
  M_APP1  = 0xe1,
  M_APP2  = 0xe2,
  M_APP3  = 0xe3,
  M_APP4  = 0xe4,
  M_APP5  = 0xe5,
  M_APP6  = 0xe6,
  M_APP7  = 0xe7,
  M_APP8  = 0xe8,
  M_APP9  = 0xe9,
  M_APP10 = 0xea,
  M_APP11 = 0xeb,
  M_APP12 = 0xec,
  M_APP13 = 0xed,
  M_APP14 = 0xee,
  M_APP15 = 0xef,
  
  M_JPG0  = 0xf0,
  M_JPG13 = 0xfd,
  M_COM   = 0xfe,
  
  M_TEM   = 0x01,
  
  M_ERROR = 0x100
} JPEG_MARKER;

#define OUTPUT_BUF_SIZE  4096        /* choose an efficiently fwrite'able size */

/* Expanded data destination object for stdio output */

typedef struct {
  struct jpeg_destination_mgr pub; /* public fields */

  FILE *outfile;		/* target stream */
  JOCTET buffer[OUTPUT_BUF_SIZE];		/* start of buffer */
} my_destination_mgr;


/*
 * Empty the output buffer --- called whenever buffer fills up.
 *
 * In typical applications, this should write the entire output buffer
 * (ignoring the current state of next_output_byte & free_in_buffer),
 * reset the pointer & count to the start of the buffer, and return TRUE
 * indicating that the buffer has been dumped.
 *
 * In applications that need to be able to suspend compression due to output
 * overrun, a FALSE return indicates that the buffer cannot be emptied now.
 * In this situation, the compressor will return to its caller (possibly with
 * an indication that it has not accepted all the supplied scanlines).  The
 * application should resume compression after it has made more room in the
 * output buffer.  Note that there are substantial restrictions on the use of
 * suspension --- see the documentation.
 *
 * When suspending, the compressor will back up to a convenient restart point
 * (typically the start of the current MCU). next_output_byte & free_in_buffer
 * indicate where the restart point will be if the current call returns FALSE.
 * Data beyond this point will be regenerated after resumption, so do not
 * write it out when emptying the buffer externally.
 */

boolean empty_output_buffer (my_destination_mgr *destination) {
  my_destination_mgr *dest = destination;

  if (fwrite(dest->buffer, 1, OUTPUT_BUF_SIZE, dest->outfile) != OUTPUT_BUF_SIZE) {
   perror("Output file write error --- out of disk space?");
   exit(1);
   /* ERREXIT(cinfo, JERR_FILE_WRITE);*/
  }

  dest->pub.next_output_byte = dest->buffer;
  dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;

  return TRUE;
}


/*
 * Basic output routines.
 *
 * Note that we do not support suspension while writing a marker.
 * Therefore, an application using suspension must ensure that there is
 * enough buffer space for the initial markers (typ. 600-700 bytes) before
 * calling jpeg_start_compress, and enough space to write the trailing EOI
 * (a few bytes) before calling jpeg_finish_compress.  Multipass compression
 * modes are not supported at all with suspension, so those two are the only
 * points where markers will be written.
 */

void emit_byte (my_destination_mgr *destination, int val) /* Emit a byte */ {
  my_destination_mgr *dest = destination;

  *(dest->pub.next_output_byte)++ = (JOCTET) val;
  if ((--dest->pub.free_in_buffer) == 0) {
    if (! empty_output_buffer(destination)) {
      perror("Suspension not allowed here");
      exit(1);
      /*ERREXIT(cinfo, JERR_CANT_SUSPEND);*/
    }
  }
}

static void emit_marker (my_destination_mgr *destination, JPEG_MARKER mark) /* Emit a marker code */ {
  emit_byte(destination, 0xFF);
  emit_byte(destination, (int) mark);
}


static void emit_2bytes (my_destination_mgr *destination, int value) /* Emit a 2-byte integer; these are always MSB first in JPEG files */ {
  emit_byte(destination, (value >> 8) & 0xFF);
  emit_byte(destination, value & 0xFF);
}


/*
 * Routines to write specific marker types.
 */

int emit_dqt (my_destination_mgr *destination, int index)
/* Emit a DQT marker */
/* Returns the precision used (0 = 8bits, 1 = 16bits) for baseline checking */
{
  /* Quantization table is externally globally defined */
  extern JQUANT_TBL qtbl;
  extern const int jpeg_natural_order[];
  int prec;
  int i;

  if (qtbl.quantval == NULL) {
    perror("Quantization table 0x%%02x was not defined");
    exit(1);
    /*ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, index);*/
  }
  prec = 0;
  for (i = 0; i < DCTSIZE2; i++) {
    if (qtbl.quantval[i] > 255)
      prec = 1;
  }

  if (! qtbl.sent_table) {
    emit_marker(destination, M_DQT);

    emit_2bytes(destination, prec ? DCTSIZE2*2 + 1 + 2 : DCTSIZE2 + 1 + 2);

    emit_byte(destination, index + (prec<<4));

    for (i = 0; i < DCTSIZE2; i++) {
      /* The table entries must be emitted in zigzag order. */
      unsigned int qval = qtbl.quantval[jpeg_natural_order[i]];

      if (prec) {
	emit_byte(destination, (int) (qval >> 8));
      }
      emit_byte(destination, (int) (qval & 0xFF));
    }

    qtbl.sent_table = TRUE;
  }
  return prec;
}


static void emit_dht (my_destination_mgr *destination, int index, boolean is_ac)
/* Emit a DHT marker */
{
  extern JHUFF_TBL ac_Huffman_Table[];
  extern JHUFF_TBL dc_Huffman_Table[];
  JHUFF_TBL *htbl;
  int length, i;
  
  if (is_ac) {
    htbl = ac_Huffman_Table;
    index += 0x10;		/* output index has AC bit set */
  } else {
    htbl = dc_Huffman_Table;
  }

  if (htbl == NULL){
    perror("Huffman table 0x%%02x was not defined");
    exit(1);
    /*ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, index);*/
  }
  if (! htbl->sent_table) {
    emit_marker(destination, M_DHT);
    
    length = 0;
    for (i = 1; i <= 16; i++)
      length += htbl->bits[i];
    
    emit_2bytes(destination, length + 2 + 1 + 16);
    emit_byte(destination, index);
    
    for (i = 1; i <= 16; i++)
      emit_byte(destination, htbl->bits[i]);
    
    for (i = 0; i < length; i++)
      emit_byte(destination, htbl->huffval[i]);
    
    htbl->sent_table = TRUE;
  }
}


#if 0
static void emit_dac (j_compress_ptr cinfo)
/* Emit a DAC marker */
/* Since the useful info is so small, we want to emit all the tables in */
/* one DAC marker.  Therefore this routine does its own scan of the table. */
{
#ifdef C_ARITH_CODING_SUPPORTED
  char dc_in_use[NUM_ARITH_TBLS];
  char ac_in_use[NUM_ARITH_TBLS];
  int length, i;
  jpeg_component_info *compptr;
  
  for (i = 0; i < NUM_ARITH_TBLS; i++)
    dc_in_use[i] = ac_in_use[i] = 0;
  
  for (i = 0; i < cinfo->comps_in_scan; i++) {
    compptr = cinfo->cur_comp_info[i];
    dc_in_use[compptr->dc_tbl_no] = 1;
    ac_in_use[compptr->ac_tbl_no] = 1;
  }
  
  length = 0;
  for (i = 0; i < NUM_ARITH_TBLS; i++)
    length += dc_in_use[i] + ac_in_use[i];
  
  emit_marker(cinfo, M_DAC);
  
  emit_2bytes(cinfo, length*2 + 2);
  
  for (i = 0; i < NUM_ARITH_TBLS; i++) {
    if (dc_in_use[i]) {
      emit_byte(cinfo, i);
      emit_byte(cinfo, cinfo->arith_dc_L[i] + (cinfo->arith_dc_U[i]<<4));
    }
    if (ac_in_use[i]) {
      emit_byte(cinfo, i + 0x10);
      emit_byte(cinfo, cinfo->arith_ac_K[i]);
    }
  }
#endif /* C_ARITH_CODING_SUPPORTED */
}


static void emit_dri (j_compress_ptr cinfo)
/* Emit a DRI marker */
{
  emit_marker(cinfo, M_DRI);
  
  emit_2bytes(cinfo, 4);	/* fixed length */

  emit_2bytes(cinfo, (int) cinfo->restart_interval);
}
#endif

static void emit_sof(my_destination_mgr *destination, JPEG_MARKER code, int image_height, int image_width)
/* Emit a SOF marker */
{
  int ci;
  int num_components = 1;
  jpeg_component_info *compptr;
  
  emit_marker(destination, code);
  
  emit_2bytes(destination, 3 * num_components + 2 + 5 + 1); /* length */

  /* Make sure image isn't bigger than SOF field can handle */
  if ((long) image_height > 65535L ||
      (long) image_width > 65535L) {
   perror("Maximum supported image dimension is %u pixels");
  exit(1);
    /*ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) 65535);*/
      }
  emit_byte(destination, 8);
  emit_2bytes(destination, image_height);
  emit_2bytes(destination, image_width);

  emit_byte(destination, num_components);

  emit_byte(destination, 1);
  emit_byte(destination, 0x22);
  emit_byte(destination, 0);
/*
  for (ci = 0, compptr = cinfo->comp_info; ci < num_components; ci++, compptr++) {
    emit_byte(destination, compptr->component_id);
    emit_byte(destination, (compptr->h_samp_factor << 4) + compptr->v_samp_factor);
    emit_byte(destination, compptr->quant_tbl_no);
  }
  */
}

static void emit_sos (my_destination_mgr *destination)
/* Emit a SOS marker */
{
  int i, td, ta, comps_in_scan;
  comps_in_scan = 1;
  
  emit_marker(destination, M_SOS);
  
  emit_2bytes(destination, 2 * comps_in_scan + 2 + 1 + 3); /* length */
  
  emit_byte(destination, comps_in_scan);
  
  for (i = 0; i < comps_in_scan; i++) {
   /* compptr = cinfo->cur_comp_info[i];*/
    emit_byte(destination, 1);
#if 0
    td = compptr->dc_tbl_no;
    ta = compptr->ac_tbl_no;
    if (cinfo->progressive_mode) {
      /* Progressive mode: only DC or only AC tables are used in one scan;
       * furthermore, Huffman coding of DC refinement uses no table at all.
       * We emit 0 for unused field(s); this is recommended by the P&M text
       * but does not seem to be specified in the standard.
       */
      if (cinfo->Ss == 0) {
	ta = 0;			/* DC scan */
	if (cinfo->Ah != 0 && !cinfo->arith_code)
	  td = 0;		/* no DC table either */
      } else {
	td = 0;			/* AC scan */
      }
    }
    emit_byte(cinfo, (td << 4) + ta);
#endif
    emit_byte(destination, 0);
  }

#if 0
  emit_byte(cinfo, cinfo->Ss);
  emit_byte(cinfo, cinfo->Se);
  emit_byte(cinfo, (cinfo->Ah << 4) + cinfo->Al);
#endif
  emit_byte(destination, 0);
  emit_byte(destination, 63);
  emit_byte(destination, 0);
}


static void emit_jfif_app0 (my_destination_mgr *destination)
/* Emit a JFIF-compliant APP0 marker */
{
  /*
   * Length of APP0 block	(2 bytes)
   * Block ID			(4 bytes - ASCII "JFIF")
   * Zero byte			(1 byte to terminate the ID string)
   * Version Major, Minor	(2 bytes - major first)
   * Units			(1 byte - 0x00 = none, 0x01 = inch, 0x02 = cm)
   * Xdpu			(2 bytes - dots per unit horizontal)
   * Ydpu			(2 bytes - dots per unit vertical)
   * Thumbnail X size		(1 byte)
   * Thumbnail Y size		(1 byte)
   */
  
  emit_marker(destination, M_APP0);
  
  emit_2bytes(destination, 2 + 4 + 1 + 2 + 1 + 2 + 2 + 1 + 1); /* length */

  emit_byte(destination, 0x4A);	/* Identifier: ASCII "JFIF" */
  emit_byte(destination, 0x46);
  emit_byte(destination, 0x49);
  emit_byte(destination, 0x46);
  emit_byte(destination, 0);
  emit_byte(destination, 1); /*destination->JFIF_major_version); / * Version fields */
  emit_byte(destination, 1); /* destination->JFIF_minor_version); */
  emit_byte(destination, 1); /* destination->density_unit); / * Pixel size information */
  emit_2bytes(destination, 0x48); /* (int) destination->X_density); */
  emit_2bytes(destination, 0x048); /* (int) destination->Y_density); */
  emit_byte(destination, 0);		/* No thumbnail image */
  emit_byte(destination, 0);
}


#if 0
/*
 * These routines allow writing an arbitrary marker with parameters.
 * The only intended use is to emit COM or APPn markers after calling
 * write_file_header and before calling write_frame_header.
 * Other uses are not guaranteed to produce desirable results.
 * Counting the parameter bytes properly is the caller's responsibility.
 */

static void write_marker_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
/* Emit an arbitrary marker header */
{
  if (datalen > (unsigned int) 65533) {		/* safety check */
    perror("Bogus marker length");
    exit(1);
    /*ERREXIT(cinfo, JERR_BAD_LENGTH);*/
  }
  emit_marker(cinfo, (JPEG_MARKER) marker);

  emit_2bytes(cinfo, (int) (datalen + 2));	/* total length */
}

static void write_marker_byte (j_compress_ptr cinfo, int val)
/* Emit one byte of marker parameters following write_marker_header */
{
  emit_byte(cinfo, val);
}

#endif

/*
 * Write datastream header.
 * This consists of an SOI and optional APPn markers.
 * We recommend use of the JFIF marker, but not the Adobe marker,
 * when using YCbCr or grayscale data.  The JFIF marker should NOT
 * be used for any other JPEG colorspace.  The Adobe marker is helpful
 * to distinguish RGB, CMYK, and YCCK colorspaces.
 * Note that an application can write additional header markers after
 * jpeg_start_compress returns.
 */

static void write_file_header(my_destination_mgr *destination) {

  emit_marker(destination, M_SOI);	/* first the SOI */

  /* SOI is defined to reset restart interval to 0 */

  emit_jfif_app0(destination);
}

/*
 * Write frame header.
 * This consists of DQT and SOFn markers.
 * Note that we do not emit the SOF until we have emitted the DQT(s).
 * This avoids compatibility problems with incorrect implementations that
 * try to error-check the quant table numbers as soon as they see the SOF.
 */

static void write_frame_header(my_destination_mgr *destination, int x, int y) {
  int ci, prec;
  boolean is_baseline;
  jpeg_component_info *compptr;
#if 0 
  /* Emit DQT for each quantization table.
   * Note that emit_dqt() suppresses any duplicate tables.
   */
  prec = 0;
  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
       ci++, compptr++) {
    prec += emit_dqt(cinfo, compptr->quant_tbl_no);
  }
  /* now prec is nonzero iff there are any 16-bit quant tables. */
  
  /* Check for a non-baseline specification.
   * Note we assume that Huffman table numbers won't be changed later.
   */
  if (cinfo->arith_code || cinfo->progressive_mode ||
      cinfo->data_precision != 8) {
    is_baseline = FALSE;
  } else {
    is_baseline = TRUE;
    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
	 ci++, compptr++) {
      if (compptr->dc_tbl_no > 1 || compptr->ac_tbl_no > 1)
	is_baseline = FALSE;
    }
    if (prec && is_baseline) {
      is_baseline = FALSE;
      /* If it's baseline except for quantizer size, warn the user */
      printf("Caution: quantization tables are too coarse for baseline JPEG");
    }
  }

  /* Emit the proper SOF marker */
  if (cinfo->arith_code) {
    emit_sof(cinfo, M_SOF9);	/* SOF code for arithmetic coding */
  } else {
    if (cinfo->progressive_mode)
      emit_sof(cinfo, M_SOF2);	/* SOF code for progressive Huffman */
    else if (is_baseline)
      emit_sof(cinfo, M_SOF0);	/* SOF code for baseline implementation */
    else
      emit_sof(cinfo, M_SOF1);	/* SOF code for non-baseline Huffman file */
  }
#endif
  emit_dqt(destination, 0);
  emit_sof(destination, M_SOF0, x, y);
}


/*
 * Write scan header.
 * This consists of DHT or DAC markers, optional DRI, and SOS.
 * Compressed data will be written following the SOS.
 */

static void write_scan_header(my_destination_mgr *destination)
{
  int i;
  int comps_in_scan = 1;

	  
    /* Emit Huffman tables.
     * Note that emit_dht() suppresses any duplicate tables.
     */
    for (i = 0; i < comps_in_scan; i++) {
#if 0
      if (cinfo->progressive_mode) {
	/* Progressive mode: only DC or only AC tables are used in one scan */
	if (cinfo->Ss == 0) {
	  if (cinfo->Ah == 0)	/* DC needs no table for refinement scan */
	    emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
	} else {
	  emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
	}
      } else {
	/* Sequential mode: need both DC and AC tables */
	emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
	emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
      }
#endif 
      emit_dht(destination, 0, FALSE);
      emit_dht(destination, 1, TRUE);
    }

  emit_sos(destination);
}

/*
 * Write datastream trailer.
 */

static void write_file_trailer(my_destination_mgr *destination) {
  emit_marker(destination, M_EOI);
}

#if 0
/*
 * Write an abbreviated table-specification datastream.
 * This consists of SOI, DQT and DHT tables, and EOI.
 * Any table that is defined and not marked sent_table = TRUE will be
 * emitted.  Note that all tables will be marked sent_table = TRUE at exit.
 */

static void write_tables_only (j_compress_ptr cinfo)
{
  int i;

  emit_marker(cinfo, M_SOI);

  for (i = 0; i < NUM_QUANT_TBLS; i++) {
    if (cinfo->quant_tbl_ptrs[i] != NULL)
      (void) emit_dqt(cinfo, i);
  }

  if (! cinfo->arith_code) {
    for (i = 0; i < NUM_HUFF_TBLS; i++) {
      if (cinfo->dc_huff_tbl_ptrs[i] != NULL)
	emit_dht(cinfo, i, FALSE);
      if (cinfo->ac_huff_tbl_ptrs[i] != NULL)
	emit_dht(cinfo, i, TRUE);
    }
  }

  emit_marker(cinfo, M_EOI);
}


/*
 * Initialize the marker writer module.
 */
#if 0
void jinit_marker_writer (j_compress_ptr cinfo) {
  my_marker_ptr marker;

  /* Create the subobject */
  marker = (my_marker_ptr)
    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
				SIZEOF(my_marker_writer));
  cinfo->marker = (struct jpeg_marker_writer *) marker;
  /* Initialize method pointers */
  marker->pub.write_file_header = write_file_header;
  marker->pub.write_frame_header = write_frame_header;
  marker->pub.write_scan_header = write_scan_header;
  marker->pub.write_file_trailer = write_file_trailer;
  marker->pub.write_tables_only = write_tables_only;
  marker->pub.write_marker_header = write_marker_header;
  marker->pub.write_marker_byte = write_marker_byte;
  /* Initialize private state */
  marker->last_restart_interval = 0;
}
#endif

#endif
void write_jpeg_file(JOCTET *entropy_data, int nsymbols) {
	my_destination_mgr destination;
	size_t datacount;
	int symbol_index;

	/* Initialize destination structure */
	destination.pub.next_output_byte = destination.buffer;
	destination.pub.free_in_buffer = OUTPUT_BUF_SIZE;
	destination.outfile = fopen("outfile.jpg", "w+");

	/* do something usefull here */
	printf("Output\n");
	write_file_header(&destination);
	write_frame_header(&destination, 640, 480);
	write_scan_header(&destination);
	/* write image here */
	for (symbol_index = nsymbols ;symbol_index < nsymbols; symbol_index++) {
		emit_byte(&destination, entropy_data[symbol_index]);
	}
	/*
	emit_byte(&destination, 0xa6);
	emit_byte(&destination, 0x17);
	emit_byte(&destination, 0x11);
	emit_byte(&destination, 0x83);
	emit_byte(&destination, 0xff);
	emit_byte(&destination, 0x0);
	emit_byte(&destination, 0x4c);
	emit_byte(&destination, 0x43);
	emit_byte(&destination, 0x7f);
	emit_byte(&destination, 0xe4);
	emit_byte(&destination, 0xce);
	emit_byte(&destination, 0x6b);
*/
	/* finish up */
	write_file_trailer(&destination);

	/* Terminate destination structure */
	datacount = OUTPUT_BUF_SIZE - destination.pub.free_in_buffer;
	if (datacount > 0) {
		if (fwrite(destination.buffer, 1, datacount, destination.outfile) != datacount) {
			perror("Output file write error --- out of disk space?");
			exit(1);
		}
	}
	fflush(destination.outfile);
	if (ferror(destination.outfile)) {
		perror("Output file write error --- out of disk space?");
		exit(1);
	}
	fclose(destination.outfile);
}