jcapimin.c

基于Linux的ffmepg decoder

/*
 * jcapimin.c
 *
 * Copyright (C) 1994-1998, 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 application interface code for the compression half
 * of the JPEG library.  These are the "minimum" API routines that may be
 * needed in either the normal full-compression case or the transcoding-only
 * case.
 *
 * Most of the routines intended to be called directly by an application
 * are in this file or in jcapistd.c.  But also see jcparam.c for
 * parameter-setup helper routines, jcomapi.c for routines shared by
 * compression and decompression, and jctrans.c for the transcoding case.
 */

#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"
#include "portab.h"


/*
 * Initialization of a JPEG compression object.
 * The error manager must already be set up (in case memory manager fails).
 */

//pwhsu++:20031013   

GLOBAL(void)
jpeg_CreateCompress (j_compress_ptr cinfo, int version, size_t structsize)
{
  int i;

  /* Guard against version mismatches between library and caller. */
  cinfo->mem = NULL;		/* so jpeg_destroy knows mem mgr not called */
//  if (version != JPEG_LIB_VERSION)
//    ERREXIT2(cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version);
  if (structsize != SIZEOF(struct jpeg_compress_struct))
    ERREXIT2(cinfo, JERR_BAD_STRUCT_SIZE, 
	     (int) SIZEOF(struct jpeg_compress_struct), (int) structsize);

  /* For debugging purposes, we zero the whole master structure.
   * But the application has already set the err pointer, and may have set
   * client_data, so we have to save and restore those fields.
   * Note: if application hasn't set client_data, tools like Purify may
   * complain here.
   */
  {
    struct jpeg_error_mgr * err = cinfo->err;
    void * client_data = cinfo->client_data; /* ignore Purify complaint here */
//    MEMZERO(cinfo, SIZEOF(struct jpeg_compress_struct));	//pwhsu--:20040128 memzero
    cinfo->err = err;
    cinfo->client_data = client_data;
  }
  cinfo->is_decompressor = FALSE;	//pwhsu:20031013 it's TRUE at decoder

  /* Initialize a memory manager instance for this object */
  jinit_memory_mgr((j_common_ptr) cinfo);

  /* Zero out pointers to permanent structures. */
  cinfo->progress = NULL;
  cinfo->dest = NULL;

  cinfo->comp_info = NULL;

  for (i = 0; i < NUM_QUANT_TBLS; i++)
    cinfo->quant_tbl_ptrs[i] = NULL;

  for (i = 0; i < NUM_HUFF_TBLS; i++) {
    cinfo->dc_huff_tbl_ptrs[i] = NULL;
    cinfo->ac_huff_tbl_ptrs[i] = NULL;
  }

  cinfo->script_space = NULL;

  cinfo->input_gamma = 1.0;	/* in case application forgets */

  /* OK, I'm ready */
  cinfo->global_state = CSTATE_START;
}


/*
 * Destruction of a JPEG compression object
 */

GLOBAL(void)
jpeg_destroy_compress (j_compress_ptr cinfo)
{
  jpeg_destroy((j_common_ptr) cinfo); /* use common routine */
}


/*
 * Abort processing of a JPEG compression operation,
 * but don't destroy the object itself.
 */

GLOBAL(void)
jpeg_abort_compress (j_compress_ptr cinfo)
{
  jpeg_abort((j_common_ptr) cinfo); /* use common routine */
}


/*
 * Forcibly suppress or un-suppress all quantization and Huffman tables.
 * Marks all currently defined tables as already written (if suppress)
 * or not written (if !suppress).  This will control whether they get emitted
 * by a subsequent jpeg_start_compress call.
 *
 * This routine is exported for use by applications that want to produce
 * abbreviated JPEG datastreams.  It logically belongs in jcparam.c, but
 * since it is called by jpeg_start_compress, we put it here --- otherwise
 * jcparam.o would be linked whether the application used it or not.
 */

GLOBAL(void)
jpeg_suppress_tables (j_compress_ptr cinfo, boolean suppress)
{
  int i;
  JQUANT_TBL * qtbl;
  JHUFF_TBL * htbl;

  for (i = 0; i < NUM_QUANT_TBLS; i++) {
    if ((qtbl = cinfo->quant_tbl_ptrs[i]) != NULL)
      qtbl->sent_table = suppress;
  }

  for (i = 0; i < NUM_HUFF_TBLS; i++) {
    if ((htbl = cinfo->dc_huff_tbl_ptrs[i]) != NULL)
      htbl->sent_table = suppress;
    if ((htbl = cinfo->ac_huff_tbl_ptrs[i]) != NULL)
      htbl->sent_table = suppress;
  }
}


/*
 * Finish JPEG compression.
 *
 * If a multipass operating mode was selected, this may do a great deal of
 * work including most of the actual output.
 */

GLOBAL(void)
jpeg_finish_compress (j_compress_ptr cinfo)
{
  JDIMENSION iMCU_row;
 // unsigned int stuffnum;
  int i;
  int x, y;
  int a;


	do {
		READ_CPSTS(sreg);
	} while ((sreg & 32) == 0);
	

  if (cinfo->global_state == CSTATE_SCANNING ||
      cinfo->global_state == CSTATE_RAW_OK) {
    /* Terminate first pass */
    if (cinfo->next_scanline < cinfo->image_height)
      ERREXIT(cinfo, JERR_TOO_LITTLE_DATA);
    (*cinfo->master->finish_pass) (cinfo);					//pwhsu:20031014 finish_pass_master()
	//finish_pass_master1(cinfo);
  } else if (cinfo->global_state != CSTATE_WRCOEFS)
    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
  /* Perform any remaining passes */
  while (! cinfo->master->is_last_pass) {
    (*cinfo->master->prepare_for_pass) (cinfo);
    for (iMCU_row = 0; iMCU_row < cinfo->total_iMCU_rows; iMCU_row++) {
      if (cinfo->progress != NULL) {
	cinfo->progress->pass_counter = (long) iMCU_row;
	cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows;
	(*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
      }

    }
    (*cinfo->master->finish_pass) (cinfo);
  }



  /* Write EOI, do final cleanup */
  write_file_trailer1(cinfo);

	mFa526DrainWrBuf ();
  //pwhsu++:20040219
  //check autobuffering is done
	do {
		READ_VLDSTS(vldreg);
	} while ((vldreg & 1024) == 0);



  //Read the system mem pointer and local mem pointer
  READ_ABADR(smadr);			//Read system memory pointer (64 byte)
//  READ_BALR (x);			//Read local memory pointer (words)
  READ_BALR (x);			//Read local memory pointer (byres)
  READ_VADR (y);		    //Read local memory pointer (bits)      

#if 1
  y = (y & 0xff)/8 + x & 0x3f;
#else
  x = x & 0x3f;
  y = y & 0xff;
  y = y/8 + x;
#endif
  smadr = smadr - (unsigned int)outbitstr;		//total bytes in system memory
  bitslen = y + smadr;

  x = (256 - x) >> 1;
//  for(i=0;i<32;i++){
  for(i = x; i > 0; i--){
	  BitstreamPutBits(0x0, 16);
  }

	mFa526DrainWrBuf ();
	do {
		READ_VLDSTS(vldreg);
	} while ((vldreg & 1024) == 0);



  SET_VLDCTL(32);		//ABF stop 

  /* We can use jpeg_abort to release memory and reset global_state */
  jpeg_abort((j_common_ptr) cinfo);
}


/*
 * Write a special marker.
 * This is only recommended for writing COM or APPn markers.
 * Must be called after jpeg_start_compress() and before
 * first call to jpeg_write_scanlines() or jpeg_write_raw_data().
 */

GLOBAL(void)
jpeg_write_marker (j_compress_ptr cinfo, int marker,
		   const JOCTET *dataptr, unsigned int datalen)
{
  JMETHOD(void, write_marker_byte, (j_compress_ptr info, int val));

  if (cinfo->next_scanline != 0 ||
      (cinfo->global_state != CSTATE_SCANNING &&
       cinfo->global_state != CSTATE_RAW_OK &&
       cinfo->global_state != CSTATE_WRCOEFS))
    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);

  //(*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
  write_marker_header1(cinfo, marker, datalen);
  write_marker_byte = cinfo->marker->write_marker_byte;	/* copy for speed */
  while (datalen--) {
    (*write_marker_byte) (cinfo, *dataptr);
    dataptr++;
  }
}