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diff --git a/doc/html/RM_H5P.html b/doc/html/RM_H5P.html index 4972b8e..f2e23d7 100644 --- a/doc/html/RM_H5P.html +++ b/doc/html/RM_H5P.html @@ -193,6 +193,7 @@ which require many different parameters to be easily manipulated. <li><a href="#Property-GetFilter">H5Pget_filter</a> <li><a href="#Property-SetFletcher32">H5Pset_fletcher32</a> <li><a href="#Property-SetShuffle">H5Pset_shuffle</a> + <li><a href="#Property-SetSzip">H5Pset_szip</a> <li><a href="#Property-SetExternal">H5Pset_external</a> <li><a href="#Property-GetExternalCount">H5Pget_external_count</a> <li><a href="#Property-GetExternal">H5Pget_external</a> @@ -335,6 +336,7 @@ facilitate moving easily between them.</i> <li><a href="#Property-GetFilter">h5pget_filter_f</a> <li><a href="#Property-SetFletcher32">h5pset_fletcher32_f</a> <li><a href="#Property-SetShuffle">h5pset_shuffle_f</a> +<!--<li><a href="#Property-SetSzip">h5pset_szip_f</a> --> <li><a href="#Property-SetExternal">h5pset_external_f</a> <li><a href="#Property-GetExternalCount">h5pget_external_count_f</a> <li><a href="#Property-GetExternal">h5pget_external_f</a> @@ -3607,6 +3609,7 @@ facilitate moving easily between them.</i> --> </dl> + <hr> <dl> <dt><strong>Name:</strong> <a name="Property-SetFletcher32">H5Pset_fletcher32</a> @@ -3637,6 +3640,225 @@ facilitate moving easily between them.</i> --> </dl> + + + + + + + + + + +<hr> +<dl> + <dt><strong>Name:</strong> <a name="Property-SetSzip">H5Pset_szip</a> + <dt><strong>Signature:</strong> + <dd><em>herr_t</em> <code>H5Pset_szip</code>(<em>hid_t</em> <code>plist</code>, + <em>unsigned int</em> <code>options_mask</code>, + <em>unsigned int</em> <code>pixels_per_block</code>) + <dt><strong>Purpose:</strong> + <dd>Sets up use of the szip compression filter. + <dt><strong>Description:</strong> + <dd><code>H5Pset_szip</code> sets the dataset compression method + to szip compression, <code>H5Z_FILTER_SZIP</code>, + a compression designed for use with scientific data. + <p> + Szip options are passed in an options mask, <code>options_mask</code>, + as follows. + <center> + <table> + <tr valign=top align=left><td> + <hr> + <b>Option</b> + </td><td> + <hr> + <b>Description</b> + <br> + <font size=-1>(Paired options are mutually exclusive.)</font> + </td></tr> + + <tr valign=top align=left><td> + <hr> + <code>CHIP_OPTION_MASK </code> + </td><td> + <hr> + Compresses exactly as in hardware. + </td></tr> + <tr valign=top align=left><td> + <code>ALLOW_K13_OPTION_MASK </code> + </td><td> + Allows k split = 13 compression mode. (Default) + </td></tr> + + <tr valign=top align=left><td> + <hr> + <code>EC_OPTION_MASK</code> + </td><td> + <hr> + Selects entropy coding method. (Default) + </td></tr> + <tr valign=top align=left><td> + <code>NN_OPTION_MASK</code> + </td><td> + Selects nearest neighbor coding method. + </td></tr> + + <tr valign=top align=left><td> + <hr> + <code>LSB_OPTION_MASK</code> + </td><td> + <hr> + Data format is least significant byte first. (Default) + </td></tr> + <tr valign=top align=left><td> + <code>MSB_OPTION_MASK</code> + </td><td> + Data format is most significant byte first. + </td></tr> + + <tr valign=top align=left><td> + <hr> + <code>RAW_OPTION_MASK</code> + </td><td> + <hr> + Do not output szip header.<br> + Not a default setting, but should always be set in HDF5. + </td></tr> + + <tr valign=top align=left><td> + <hr> + </td><td> + <hr> + </td></tr> + </table> + </center> + Some typical usages are as follows: + <ul> + <li>If the dataset employs more than 8 bits/pixel, + one of <code>LSB_OPTION_MASK</code> or + <code>MSB_OPTION_MASK</code> is specified. + <li>One of the compression methods, + <code>EC_OPTION_MASK</code> or + <code>NN_OPTION_MASK</code>, is specified. + <li>The <code>RAW_OPTION_MASK</code> and + <code>ALLOW_K13_OPTION_MASK</code> are used. + </ul> + <p> + Options are combined to create the options mask by means of + a logical <code>OR</code> operation. For example, the + option mask can be set as follows: + <br><br><code> + options_mask = MSB_OPTION_MASK | NN_OPTION_MASK | RAW_OPTION_MASK; + </code> + <p> + Szip compresses data block by block, with a user-tunable block size. + This block size is passed in the parameter + <code>pixels_per_block</code> and must be even, + with typical values being <code>8</code>, <code>10</code>, + <code>16</code>, and <code>32</code>. + The more pixel values vary, the smaller this number should be. + For optimal performance, the number of pixels per scan line + (i.e., the size of the fastest-changing dimension in the dataspace) + should be an even multiple of the number of pixels per block. + <p> + <dt><strong>Notes:</strong> + <dd>Szip works only with datasets with 1 through 24 bits/pixel, + 32 pits/pixel, or 64 bits/pixel. + <p> + Szip typically requires that the user application also supply + the number of pixels in the object to be compressed, + the number of bits per pixel, and the number of pixels per scan line. + These values need not be independently supplied in the HDF5 + environment as they are derived from the datatype and dataspace, + which are already known. + <dt><strong>Parameters:</strong> + <dl> + <dt><em>hid_t</em> <code>plist</code> + <dd>IN: Dataset creation or dataset transfer property list + identifier. + <dt><em>unsigned int</em> <code>options_mask</code> + <dd>IN: A bit-mask conveying the desired szip options. + <dt><em>unsigned int</em> <code>pixels_per_block</code> + <dd>IN: The number of pixels or data elements in each data block. + </dl> + <dt><strong>Returns:</strong> + <dd>Returns a non-negative value if successful; + otherwise returns a negative value. +<!-- + <dt><strong>Non-C API(s):</strong> + <dd><a href="fortran/h5p_FORTRAN.html#h5pset_szip_f" + target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a> +--> <!-- + <img src="Graphics/Java.gif"> + <img src="Graphics/C++.gif"> + --> + + <p> + <dt><strong>References:</strong> + (This material will appear in a separate file in the final release documents.) + <ul> + <li>J. Venbrux, P.S. Yeh, G. Zweigle, J. Vesel, + "A VLSI Chip Solution for Lossless Medical Imagery Compression," + <cite>SPIE conference on Medical Imaging 1994</cite>. + Vol. 2164, pp. 561-572, February 13-14, 1994, + Newport Beach, California. + + <li>J. Venbrux, J. Gambles, D. Wiseman, G. Zweigle, W.H. Miller, P.S. Yeh, + "A VLSI Chip Set Development for Lossless Data Compression," + <cite>AIAA Computing in Aerospace 9 Conference</cite>. + October 1993, San Diego, California. + + <li>J. Venbrux, G. Zweigle, J. Gambles, D.Wiseman, W. Miller, P. Yeh, + "An Adaptive, Lossless Data Compression Algorithm and VLSI + Implementations," + <cite>NASA Symposium on VLSI Design</cite>. + Pp 1.2.1-1.2.16, November 1993. + + <li>J. Venbrux, P.S. Yeh, and M. N. Liu, + "A VLSI Chip Set for High Speed Lossless Data Compression," + <cite>IEEE Transactions on Circuits and Systems for Video + Technology</cite>. + Pp. 381-391, December 1992. + + <li>CCSDS 120.0-G-1. + <cite>Lossless Data Compression</cite>. + Green Book. Issue 1, May 1997. + This Report presents a summary of the key operational concepts and + rationale underlying the requirements for the CCSDS Recommendation, + Lossless Data Compression. Supporting performance information along + with illustrations are also included. This Report also provides a + broad tutorial overview of the CCSDS Lossless Data Compression + algorithm and is aimed at helping first-time readers + to understand the Recommendation. + <br> + Appears In: CCSDS Publications TGannett 02/04/2003 387K Services + Check Out View + + <li>CCSDS 121.0-B-1. + <cite>Lossless Data Compression</cite>. + Blue Book. Issue 1, May 1997. + This Recommendation defines a source-coding data-compression + algorithm and specifies how data compressed using the algorithm + are inserted into source packets for retrieval and decoding. + <br> + Appears In: CCSDS Publications + + </ul> +</dl> + + + + + + + + + + + + + <hr> <dl> <dt><strong>Name:</strong> <a name="Property-SetEdcCheck">H5Pset_edc_check</a> @@ -3689,6 +3911,7 @@ facilitate moving easily between them.</i> --> </dl> + <hr> <dl> <dt><strong>Name:</strong> <a name="Property-GetEdcCheck">H5Pget_edc_check</a> @@ -3718,6 +3941,7 @@ facilitate moving easily between them.</i> --> </dl> + <hr> <dl> <dt><strong>Name:</strong> <a name="Property-SetFilterCallback">H5Pset_filter_callback</a> @@ -6704,7 +6928,7 @@ And in this document, the Describes HDF5 Release 1.5, Unreleased Development Branch </address><!-- #EndLibraryItem --> -Last modified: 7 April 2003 +Last modified: 16 April 2003 </body> </html> |