jcmaster.c

基于Linux的ffmepg decoder

    compptr->last_col_width = 1;


	for(i=0;i<compptr->MCU_blocks;i++){
	  DMA_COMMAND_local[2+blkidx*4] = ((( cinfo->MCUs_per_row * compptr->MCU_width)*2-1)<<8) | 0x02;
	  DMA_COMMAND_local[42+blkidx*4] = 
		  ((( cinfo->MCUs_per_row * compptr->MCU_width)*2-1)<<8) | 0x02;
	  blkidx++;
	}


    /* For noninterleaved scans, it is convenient to define last_row_height
     * as the number of block rows present in the last iMCU row.
     */
    tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
    if (tmp == 0) tmp = compptr->v_samp_factor;
    compptr->last_row_height = tmp;
    
    /* Prepare array describing MCU composition */
    cinfo->blocks_in_MCU = 1;
    cinfo->MCU_membership[0] = 0;
	mcublkn = compptr->MCU_blocks;		//pwhsu++:20040108

	tbidx0 = compptr->ac_tbl_no;
	tbidx0 = (tbidx0<<1) | compptr->dc_tbl_no;
	tbidx0 = (tbidx0<<2) | compptr->quant_tbl_no;
	tbidx0 = tbidx0 & 0xf;

	Comp_member = 0x0;
	tbidx = tbidx0;	
	imginfo = (tbidx<<20) | (Comp_member&0xfffff);

    
  } else {
    
    /* Interleaved (multi-component) scan */
    if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN)
      ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan,
	       MAX_COMPS_IN_SCAN);
    
    /* Overall image size in MCUs */
    cinfo->MCUs_per_row = (JDIMENSION)
      jdiv_round_up((long) cinfo->image_width,
		    (long) (cinfo->max_h_samp_factor*DCTSIZE));
	

    cinfo->MCU_rows_in_scan = (JDIMENSION)
      jdiv_round_up((long) cinfo->image_height,
		    (long) (cinfo->max_v_samp_factor*DCTSIZE));
    
    cinfo->blocks_in_MCU = 0;
    
    for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
      compptr = cinfo->cur_comp_info[ci];
      /* Sampling factors give # of blocks of component in each MCU */
      compptr->MCU_width = compptr->h_samp_factor;
      compptr->MCU_height = compptr->v_samp_factor;
      compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height;
      compptr->MCU_sample_width = compptr->MCU_width * DCTSIZE;
		
      for(i=0;i<compptr->MCU_blocks;i++){
		  DMA_COMMAND_local[2+blkidx*4] = ((( cinfo->MCUs_per_row * compptr->MCU_width)*2-1)<<8) | 0x02;
		  DMA_COMMAND_local[42+blkidx*4] = 
			  ((( cinfo->MCUs_per_row * compptr->MCU_width)*2-1)<<8) | 0x02;
		  blkidx++;
	  }


      /* Figure number of non-dummy blocks in last MCU column & row */
      tmp = (int) (compptr->width_in_blocks % compptr->MCU_width);
      if (tmp == 0) tmp = compptr->MCU_width;
      compptr->last_col_width = tmp;
      tmp = (int) (compptr->height_in_blocks % compptr->MCU_height);
      if (tmp == 0) tmp = compptr->MCU_height;
      compptr->last_row_height = tmp;
      /* Prepare array describing MCU composition */
      mcublks = compptr->MCU_blocks;
	  mcublkn = mcublkn + compptr->MCU_blocks;		//pwhsu++:20040108
	  
	  if ( ci==0 ){				//pwhsu++:20040108
		tbidx0 = compptr->ac_tbl_no;
		tbidx0 = (tbidx0<<1) | compptr->dc_tbl_no;
		tbidx0 = (tbidx0<<2) | compptr->quant_tbl_no;
		tbidx0 = tbidx0 & 0xf;
	  }else if ( ci==1 ){
		tbidx1 = compptr->ac_tbl_no;
		tbidx1 = (tbidx1<<1) | compptr->dc_tbl_no;
		tbidx1 = (tbidx1<<2) | compptr->quant_tbl_no;
		tbidx1 = tbidx1 & 0xf;
	  }else if ( ci==2 ){
		tbidx2 = compptr->ac_tbl_no;
		tbidx2 = (tbidx2<<1) | compptr->dc_tbl_no;
		tbidx2 = (tbidx2<<2) | compptr->quant_tbl_no;
		tbidx2 = tbidx2 & 0xf;
	  }

      if (cinfo->blocks_in_MCU + mcublks > C_MAX_BLOCKS_IN_MCU)     //pwhsu:20031016 C_MAX_BLOCKS_IN_MCU = 10
	ERREXIT(cinfo, JERR_BAD_MCU_SIZE);
      while (mcublks-- > 0) {
	cinfo->MCU_membership[cinfo->blocks_in_MCU] = ci;
	//rinfo.MCU_membership[cinfo->blocks_in_MCU] = ci; //pwhsu++:20031023	
	Comp_member = Comp_member | ci << 2*icount;	//pwhsu++:20040108
	cinfo->blocks_in_MCU++;
	icount = icount + 1;
      }
    }

	 tbidx = (tbidx2<<8) | (tbidx1<<4) | tbidx0;	//pwhsu++:20040108
	 imginfo = (tbidx<<20) | (Comp_member&0xfffff);
    
  }




	//pwhsu++:20040108
	SET_MCUBR(mcublkn);
	SET_MCUTIR(imginfo);

	rinfo.mcublkn = mcublkn;


	DMA_COMMAND_local[mcublkn*4-1] = 0x810010;	//chain disable
	DMA_COMMAND_local[mcublkn*4+39] = 0x810010;	//chain disable

	//DMA_COMMAND_local[3+(blkn-1)*4+dbnum*40] = 0x810010;	//chain disable

  /* Convert restart specified in rows to actual MCU count. */
  /* Note that count must fit in 16 bits, so we provide limiting. */
  if (cinfo->restart_in_rows > 0) {
    long nominal = (long) cinfo->restart_in_rows * (long) cinfo->MCUs_per_row;
    cinfo->restart_interval = (unsigned int) MIN(nominal, 65535L);
  }
}


/*
 * Per-pass setup.
 * This is called at the beginning of each pass.  We determine which modules
 * will be active during this pass and give them appropriate start_pass calls.
 * We also set is_last_pass to indicate whether any more passes will be
 * required.
 */

METHODDEF(void)
prepare_for_pass (j_compress_ptr cinfo)
{
  my_master_ptr master = (my_master_ptr) cinfo->master;

  switch (master->pass_type) {
  case main_pass:
    /* Initial pass: will collect input data, and do either Huffman
     * optimization or data output for the first scan.
     */
    select_scan_parameters(cinfo);
    per_scan_setup(cinfo);			//pwhsu:20031016  setup the MCU number

    //(*cinfo->entropy->start_pass) (cinfo, cinfo->optimize_coding);	//pwhsu:20031009 start_pass_huff
	start_pass_huff1(cinfo);
    (*cinfo->coef->start_pass) (cinfo,
				(master->total_passes > 1 ?
				 JBUF_SAVE_AND_PASS : JBUF_PASS_THRU));		//pwhsu:20031009 start_pass_coef
    (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU);		//pwhsu:20031009 start_pass_main
//    if (cinfo->optimize_coding) {
      /* No immediate data output; postpone writing frame/scan headers */
//      master->pub.call_pass_startup = FALSE;
//    } else {		//pwhsu:20031009  The condition will execute this part
      /* Will write frame/scan headers at first jpeg_write_scanlines call */
      master->pub.call_pass_startup = TRUE;
//    }
    break;

  default:
    ERREXIT(cinfo, JERR_NOT_COMPILED);
  }

  master->pub.is_last_pass = (master->pass_number == master->total_passes-1);

#if 0
  /* Set up progress monitor's pass info if present */
  if (cinfo->progress != NULL) {	//pwhsu:20031009 ぃ穦磅︽
    cinfo->progress->completed_passes = master->pass_number;
    cinfo->progress->total_passes = master->total_passes;
  }
#endif
}


/*
 * Special start-of-pass hook.
 * This is called by jpeg_write_scanlines if call_pass_startup is TRUE.
 * In single-pass processing, we need this hook because we don't want to
 * write frame/scan headers during jpeg_start_compress; we want to let the
 * application write COM markers etc. between jpeg_start_compress and the
 * jpeg_write_scanlines loop.
 * In multi-pass processing, this routine is not used.
 */

METHODDEF(void)
pass_startup (j_compress_ptr cinfo)
{
  cinfo->master->call_pass_startup = FALSE; /* reset flag so call only once */

  //(*cinfo->marker->write_frame_header) (cinfo);		//pwhsu:20031015 write_frame_header()
  //(*cinfo->marker->write_scan_header) (cinfo);		//pwhsu:20031015 write_scan_header()
	
  write_frame_header1(cinfo);
  write_scan_header1(cinfo);

}


/*
 * Finish up at end of pass.
 */

METHODDEF(void)
finish_pass_master (j_compress_ptr cinfo)
{
  my_master_ptr master = (my_master_ptr) cinfo->master;

  /* The entropy coder always needs an end-of-pass call,
   * either to analyze statistics or to flush its output buffer.
   */
  (*cinfo->entropy->finish_pass) (cinfo);    //pwhsu:20031027 finish_pass_huff()

  /* Update state for next pass */
  switch (master->pass_type) {
  case main_pass:
    /* next pass is either output of scan 0 (after optimization)
     * or output of scan 1 (if no optimization).
     */
    master->pass_type = output_pass;
    if (! cinfo->optimize_coding)
      master->scan_number++;
    break;
  case huff_opt_pass:
    /* next pass is always output of current scan */
    master->pass_type = output_pass;
    break;
  case output_pass:
    /* next pass is either optimization or output of next scan */
    if (cinfo->optimize_coding)
      master->pass_type = huff_opt_pass;
    master->scan_number++;
    break;
  }

  master->pass_number++;
}

#if 0
void finish_pass_master1 (j_compress_ptr cinfo)
{
  my_master_ptr master = (my_master_ptr) cinfo->master;

  /* The entropy coder always needs an end-of-pass call,
   * either to analyze statistics or to flush its output buffer.
   */
  (*cinfo->entropy->finish_pass) (cinfo);    //pwhsu:20031027 finish_pass_huff()

  /* Update state for next pass */
  switch (master->pass_type) {
  case main_pass:
    /* next pass is either output of scan 0 (after optimization)
     * or output of scan 1 (if no optimization).
     */
    master->pass_type = output_pass;
    if (! cinfo->optimize_coding)
      master->scan_number++;
    break;
  case huff_opt_pass:
    /* next pass is always output of current scan */
    master->pass_type = output_pass;
    break;
  case output_pass:
    /* next pass is either optimization or output of next scan */
    if (cinfo->optimize_coding)
      master->pass_type = huff_opt_pass;
    master->scan_number++;
    break;
  }

  master->pass_number++;
}
#endif
/*
 * Initialize master compression control.
 */

GLOBAL(void)
jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only)
{
  my_master_ptr master;

  master = (my_master_ptr)
      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
				  SIZEOF(my_comp_master));
  cinfo->master = (struct jpeg_comp_master *) master;
  master->pub.prepare_for_pass = prepare_for_pass;
  master->pub.pass_startup = pass_startup;
  master->pub.finish_pass = finish_pass_master;
  master->pub.is_last_pass = FALSE;

  /* Validate parameters, determine derived values */
  initial_setup(cinfo);

  if (cinfo->scan_info != NULL) {
#ifdef C_MULTISCAN_FILES_SUPPORTED
    validate_script(cinfo);
#else
    ERREXIT(cinfo, JERR_NOT_COMPILED);
#endif
  } else {
    cinfo->progressive_mode = FALSE;
    cinfo->num_scans = 1;
  }

//  if (cinfo->progressive_mode)	/*  TEMPORARY HACK ??? */
//    cinfo->optimize_coding = TRUE; /* assume default tables no good for progressive mode */

  master->pass_type = main_pass;

#if 0
  /* Initialize my private state */
  if (transcode_only) {
    /* no main pass in transcoding */
    if (cinfo->optimize_coding)
      master->pass_type = huff_opt_pass;
    else
      master->pass_type = output_pass;
  } else {				//pwhsu:20031013 磅︽
    /* for normal compression, first pass is always this type: */
    master->pass_type = main_pass;
  }
#endif

  master->scan_number = 0;
  master->pass_number = 0;
//  if (cinfo->optimize_coding)
//    master->total_passes = cinfo->num_scans * 2;
//  else
    master->total_passes = cinfo->num_scans;
}