djpeg.c

jpeg 压缩/解压缩库,是Intel 在ijg基础上改进的libjpeg,encode/decode是ijg的速度的2倍以上。

      requested_fmt = FMT_TARGA;

    } else if (keymatch(arg, "cpu", 3)) {
      int cpu;
      if (++argn >= argc) /* advance to next argument */
        usage();
      if (sscanf(argv[argn], "%d", &cpu) < 1)
        usage();
      ippStaticInitCpu((IppCpuType)cpu);
    } else {
      usage();      /* bogus switch */
    }
  }

  return argn;      /* return index of next arg (file name) */
}


/*
* Marker processor for COM and interesting APPn markers.
* This replaces the library's built-in processor, which just skips the marker.
* We want to print out the marker as text, to the extent possible.
* Note this code relies on a non-suspending data source.
*/

LOCAL(unsigned int)
jpeg_getc (j_decompress_ptr cinfo)
/* Read next byte */
{
  struct jpeg_source_mgr * datasrc = cinfo->src;

  if (datasrc->bytes_in_buffer == 0) {
    if (! (*datasrc->fill_input_buffer) (cinfo))
      ERREXIT(cinfo, JERR_CANT_SUSPEND);
  }
  datasrc->bytes_in_buffer--;
  return GETJOCTET(*datasrc->next_input_byte++);
}


METHODDEF(boolean)
print_text_marker (j_decompress_ptr cinfo)
{
  boolean traceit = (cinfo->err->trace_level >= 1);
  INT32 length;
  unsigned int ch;
  unsigned int lastch = 0;

  length = jpeg_getc(cinfo) << 8;
  length += jpeg_getc(cinfo);
  length -= 2;      /* discount the length word itself */

  if (traceit) {
    if (cinfo->unread_marker == JPEG_COM)
      fprintf(stderr, "Comment, length %ld:\n", (long) length);
    else      /* assume it is an APPn otherwise */
      fprintf(stderr, "APP%d, length %ld:\n",
      cinfo->unread_marker - JPEG_APP0, (long) length);
  }

  while (--length >= 0) {
    ch = jpeg_getc(cinfo);
    if (traceit) {
    /* Emit the character in a readable form.
    * Nonprintables are converted to \nnn form,
    * while \ is converted to \\.
    * Newlines in CR, CR/LF, or LF form will be printed as one newline.
      */
      if (ch == '\r') {
        fprintf(stderr, "\n");
      } else if (ch == '\n') {
        if (lastch != '\r')
          fprintf(stderr, "\n");
      } else if (ch == '\\') {
        fprintf(stderr, "\\\\");
      } else if (isprint(ch)) {
        putc(ch, stderr);
      } else {
        fprintf(stderr, "\\%03o", ch);
      }
      lastch = ch;
    }
  }

  if (traceit)
    fprintf(stderr, "\n");

  return TRUE;
}


#ifdef __ENABLE_TIMING__
#define get_pentium_counter ippGetCpuClocks
#endif


/*
* The main program.
*/

int
main (int argc, char **argv)
{
  struct jpeg_decompress_struct cinfo;
  struct jpeg_error_mgr jerr;
#ifdef PROGRESS_REPORT
  struct cdjpeg_progress_mgr progress;
#endif
  int file_index;
  djpeg_dest_ptr dest_mgr = NULL;
  FILE * input_file;
  FILE * output_file;
  JDIMENSION num_scanlines;

#ifdef __ENABLE_TIMING__
  unsigned __int64 clk0;
  unsigned __int64 clk1;
  int width;
  int height;
  int nchannels;
#endif

  if(ippStsNoErr > ippStaticInit())
  {
    fprintf(stderr,"Can't initialize IPP library\n");
    exit(EXIT_FAILURE);
  }

  /* On Mac, fetch a command line. */
#ifdef USE_CCOMMAND
  argc = ccommand(&argv);
#endif

  progname = argv[0];
  if (progname == NULL || progname[0] == 0)
    progname = "djpeg";   /* in case C library doesn't provide it */

  /* Initialize the JPEG decompression object with default error handling. */
  cinfo.err = jpeg_std_error(&jerr);
  jpeg_create_decompress(&cinfo);
  /* Add some application-specific error messages (from cderror.h) */
  jerr.addon_message_table = cdjpeg_message_table;
  jerr.first_addon_message = JMSG_FIRSTADDONCODE;
  jerr.last_addon_message = JMSG_LASTADDONCODE;

  /* Insert custom marker processor for COM and APP12.
  * APP12 is used by some digital camera makers for textual info,
  * so we provide the ability to display it as text.
  * If you like, additional APPn marker types can be selected for display,
  * but don't try to override APP0 or APP14 this way (see libjpeg.doc).
  */
  jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);
  jpeg_set_marker_processor(&cinfo, JPEG_APP0+12, print_text_marker);

  /* Now safe to enable signal catcher. */
#ifdef NEED_SIGNAL_CATCHER
  enable_signal_catcher((j_common_ptr) &cinfo);
#endif

  /* Scan command line to find file names. */
  /* It is convenient to use just one switch-parsing routine, but the switch
  * values read here are ignored; we will rescan the switches after opening
  * the input file.
  * (Exception: tracing level set here controls verbosity for COM markers
  * found during jpeg_read_header...)
  */

  file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);

#ifdef TWO_FILE_COMMANDLINE
  /* Must have either -outfile switch or explicit output file name */
  if (outfilename == NULL) {
    if (file_index != argc-2) {
      fprintf(stderr, "%s: must name one input and one output file\n",
        progname);
      usage();
    }
    outfilename = argv[file_index+1];
  } else {
    if (file_index != argc-1) {
      fprintf(stderr, "%s: must name one input and one output file\n",
        progname);
      usage();
    }
  }
#else
  /* Unix style: expect zero or one file name */
  if (file_index < argc-1) {
    fprintf(stderr, "%s: only one input file\n", progname);
    usage();
  }
#endif /* TWO_FILE_COMMANDLINE */

  /* Open the input file. */
  if (file_index < argc) {
    if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
      fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
      exit(EXIT_FAILURE);
    }
  } else {
    /* default input file is stdin */
    input_file = read_stdin();
  }

  /* Open the output file. */
  if (outfilename != NULL) {
    if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
      fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
      exit(EXIT_FAILURE);
    }
  } else {
    /* default output file is stdout */
    output_file = write_stdout();
  }

#ifdef PROGRESS_REPORT
  start_progress_monitor((j_common_ptr) &cinfo, &progress);
#endif

  /* Specify data source for decompression */
  jpeg_stdio_src(&cinfo, input_file);

  /* Read file header, set default decompression parameters */
  (void) jpeg_read_header(&cinfo, TRUE);

  /* Adjust default decompression parameters by re-parsing the options */
  file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);

  /* Initialize the output module now to let it override any crucial
  * option settings (for instance, GIF wants to force color quantization).
  */
  switch (requested_fmt) {
#ifdef BMP_SUPPORTED
  case FMT_BMP:
    dest_mgr = jinit_write_bmp(&cinfo, FALSE);
    break;
  case FMT_OS2:
    dest_mgr = jinit_write_bmp(&cinfo, TRUE);
    break;
#endif
#ifdef GIF_SUPPORTED
  case FMT_GIF:
    dest_mgr = jinit_write_gif(&cinfo);
    break;
#endif
#ifdef PPM_SUPPORTED
  case FMT_PPM:
    dest_mgr = jinit_write_ppm(&cinfo);
    break;
#endif
#ifdef RLE_SUPPORTED
  case FMT_RLE:
    dest_mgr = jinit_write_rle(&cinfo);
    break;
#endif
#ifdef TARGA_SUPPORTED
  case FMT_TARGA:
    dest_mgr = jinit_write_targa(&cinfo);
    break;
#endif
  default:
    ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
    break;
  }
  dest_mgr->output_file = output_file;

#ifdef __ENABLE_TIMING__
  SetThreadPriority(GetCurrentThread(),THREAD_PRIORITY_TIME_CRITICAL);
  Sleep(0);
  clk0 = get_pentium_counter();
#endif

  /* Start decompressor */
  (void) jpeg_start_decompress(&cinfo);

  /* Write output file header */
  (*dest_mgr->start_output) (&cinfo, dest_mgr);

  /* Process data */
  while (cinfo.output_scanline < cinfo.output_height) {
    num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
      dest_mgr->buffer_height);
    (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
  }

#ifdef PROGRESS_REPORT
  /* Hack: count final pass as done in case finish_output does an extra pass.
  * The library won't have updated completed_passes.
  */
  progress.pub.completed_passes = progress.pub.total_passes;
#endif

  /* Finish decompression and release memory.
  * I must do it in this order because output module has allocated memory
  * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
  */
  (*dest_mgr->finish_output) (&cinfo, dest_mgr);
  (void) jpeg_finish_decompress(&cinfo);

#ifdef __ENABLE_TIMING__
  clk1 = get_pentium_counter();
  SetThreadPriority(GetCurrentThread(),THREAD_PRIORITY_NORMAL);

  width  = cinfo.image_width;
  height = cinfo.image_height;
  nchannels = cinfo.num_components;
#endif

  jpeg_destroy_decompress(&cinfo);

  /* Close files, if we opened them */
  if (input_file != stdin)
    fclose(input_file);
  if (output_file != stdout)
    fclose(output_file);

#ifdef PROGRESS_REPORT
  end_progress_monitor((j_common_ptr) &cinfo);
#endif

#ifdef __ENABLE_TIMING__
  {
    unsigned int clocks = (unsigned int)(clk1 - clk0);
    float cpe = (float)clocks / (width*height);
    fprintf(stderr,"image: %s %dx%dx%d clocks - %u\tcpe - %6.2f\n",
      argv[file_index],
      width,
      height,
      nchannels,
      clocks,
      cpe);
  }
#endif

  /* All done. */
  exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
  return 0;     /* suppress no-return-value warnings */
}