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Current libsndfile source
author Chris Cannam
date Tue, 18 Oct 2016 13:22:47 +0100
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Chris@40 1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
Chris@40 2 <HTML>
Chris@40 3
Chris@40 4 <HEAD>
Chris@40 5 <TITLE>
Chris@40 6 libsndfile : the sf_command function.
Chris@40 7 </TITLE>
Chris@40 8 <META NAME="Author" CONTENT="Erik de Castro Lopo (erikd AT mega-nerd DOT com)">
Chris@40 9 <!-- Another version at the bottom of the page. -->
Chris@40 10 <META NAME="Description" CONTENT="The libsndfile API.">
Chris@40 11 <META NAME="Keywords" CONTENT="WAV AIFF AU libsndfile sound audio dsp Linux">
Chris@40 12 <LINK REL="stylesheet" HREF="libsndfile.css" TYPE="text/css" MEDIA="all">
Chris@40 13 <LINK REL="stylesheet" HREF="print.css" TYPE="text/css" MEDIA="print">
Chris@40 14 </HEAD>
Chris@40 15
Chris@40 16 <BODY>
Chris@40 17
Chris@40 18 <H1><B>sf_command</B></H1>
Chris@40 19 <PRE>
Chris@40 20
Chris@40 21 int sf_command (SNDFILE *sndfile, int cmd, void *data, int datasize) ;
Chris@40 22 </PRE>
Chris@40 23 <P>
Chris@40 24 This function allows the caller to retrieve information from or change aspects of the
Chris@40 25 library behaviour.
Chris@40 26 Examples include retrieving a string containing the library version or changing the
Chris@40 27 scaling applied to floating point sample data during read and write.
Chris@40 28 Most of these operations are performed on a per-file basis.
Chris@40 29 </P>
Chris@40 30 <P>
Chris@40 31 The cmd parameter is an integer identifier which is defined in &lt;sndfile.h&gt;.
Chris@40 32 All of the valid command identifiers have names beginning with "SFC_".
Chris@40 33 Data is passed to and returned from the library by use of a void pointer.
Chris@40 34 The library will not read or write more than datasize bytes from the void pointer.
Chris@40 35 For some calls no data is required in which case data should be NULL and datasize
Chris@40 36 may be used for some other purpose.
Chris@40 37 </P>
Chris@40 38 <P>
Chris@40 39 The available commands are as follows:
Chris@40 40 </P>
Chris@40 41
Chris@40 42 <CENTER>
Chris@40 43 <TABLE BORDER="0" WIDTH="90%" CELLPADDING="4">
Chris@40 44 <TR>
Chris@40 45 <TD><A HREF="#SFC_GET_LIB_VERSION">SFC_GET_LIB_VERSION</A></TD>
Chris@40 46 <TD>Retrieve the version of the library.</TD>
Chris@40 47 </TR>
Chris@40 48 <TR>
Chris@40 49 <TD><A HREF="#SFC_GET_LOG_INFO">SFC_GET_LOG_INFO</A></TD>
Chris@40 50 <TD>Retrieve the internal per-file operation log.</TD>
Chris@40 51 </TR>
Chris@40 52 <TR>
Chris@40 53 <TD><A HREF="#SFC_CALC_SIGNAL_MAX">SFC_CALC_SIGNAL_MAX</A></TD>
Chris@40 54 <TD>Calculate the measured maximum signal value.</TD>
Chris@40 55 </TR>
Chris@40 56 <TR>
Chris@40 57 <TD><A HREF="#SFC_CALC_NORM_SIGNAL_MAX">SFC_CALC_NORM_SIGNAL_MAX</A></TD>
Chris@40 58 <TD>Calculate the measured normalised maximum signal value.</TD>
Chris@40 59 </TR>
Chris@40 60 <TR>
Chris@40 61 <TD><A HREF="#SFC_CALC_MAX_ALL_CHANNELS">SFC_CALC_MAX_ALL_CHANNELS</A></TD>
Chris@40 62 <TD>Calculate the peak value for each channel.</TD>
Chris@40 63 </TR>
Chris@40 64 <TR>
Chris@40 65 <TD><A HREF="#SFC_CALC_NORM_MAX_ALL_CHANNELS">SFC_CALC_NORM_MAX_ALL_CHANNELS</A></TD>
Chris@40 66 <TD>Calculate the normalised peak for each channel.</TD>
Chris@40 67 </TR>
Chris@40 68
Chris@40 69 <TR>
Chris@40 70 <TD><A HREF="#SFC_GET_SIGNAL_MAX">SFC_GET_SIGNAL_MAX</A></TD>
Chris@40 71 <TD>Retrieve the peak value for the file (as stored in the file header).</TD>
Chris@40 72 </TR>
Chris@40 73 <TR>
Chris@40 74 <TD><A HREF="#SFC_GET_MAX_ALL_CHANNELS">SFC_GET_MAX_ALL_CHANNELS</A></TD>
Chris@40 75 <TD>Retrieve the peak value for each channel (as stored in the file header).</TD>
Chris@40 76 </TR>
Chris@40 77
Chris@40 78 <TR>
Chris@40 79 <TD><A HREF="#SFC_SET_NORM_FLOAT">SFC_SET_NORM_FLOAT</A></TD>
Chris@40 80 <TD>Modify the normalisation behaviour of the floating point reading and writing functions.</TD>
Chris@40 81 </TR>
Chris@40 82 <TR>
Chris@40 83 <TD><A HREF="#SFC_SET_NORM_DOUBLE">SFC_SET_NORM_DOUBLE</A></TD>
Chris@40 84 <TD>Modify the normalisation behaviour of the double precision floating point reading and writing functions.</TD>
Chris@40 85 </TR>
Chris@40 86 <TR>
Chris@40 87 <TD><A HREF="#SFC_GET_NORM_FLOAT">SFC_GET_NORM_FLOAT</A></TD>
Chris@40 88 <TD>Retrieve the current normalisation behaviour of the floating point reading and writing functions.</TD>
Chris@40 89 </TR>
Chris@40 90 <TR>
Chris@40 91 <TD><A HREF="#SFC_GET_NORM_DOUBLE">SFC_GET_NORM_DOUBLE</A></TD>
Chris@40 92 <TD>Retrieve the current normalisation behaviour of the double precision floating point reading and writing functions.</TD>
Chris@40 93 </TR>
Chris@40 94 <TR>
Chris@40 95 <TD><A HREF="#SFC_SET_SCALE_FLOAT_INT_READ">SFC_SET_SCALE_FLOAT_INT_READ</A></TD>
Chris@40 96 <TD>Set/clear the scale factor when integer (short/int) data is read from a file
Chris@40 97 containing floating point data.</TD>
Chris@40 98 </TR>
Chris@40 99
Chris@40 100 <TR>
Chris@40 101 <TD><A HREF="#SFC_SET_SCALE_INT_FLOAT_WRITE">SFC_SET_SCALE_INT_FLOAT_WRITE</A></TD>
Chris@40 102 <TD>Set/clear the scale factor when integer (short/int) data is written to a file
Chris@40 103 as floating point data.</TD>
Chris@40 104 </TR>
Chris@40 105
Chris@40 106 <TR>
Chris@40 107 <TD><A HREF="#SFC_GET_SIMPLE_FORMAT_COUNT">SFC_GET_SIMPLE_FORMAT_COUNT</A></TD>
Chris@40 108 <TD>Retrieve the number of simple formats supported by libsndfile.</TD>
Chris@40 109 </TR>
Chris@40 110 <TR>
Chris@40 111 <TD><A HREF="#SFC_GET_SIMPLE_FORMAT">SFC_GET_SIMPLE_FORMAT</A></TD>
Chris@40 112 <TD>Retrieve information about a simple format.</TD>
Chris@40 113 </TR>
Chris@40 114
Chris@40 115 <TR>
Chris@40 116 <TD><A HREF="#SFC_GET_FORMAT_INFO">SFC_GET_FORMAT_INFO</A></TD>
Chris@40 117 <TD>Retrieve information about a major or subtype format.</TD>
Chris@40 118 </TR>
Chris@40 119
Chris@40 120 <TR>
Chris@40 121 <TD><A HREF="#SFC_GET_FORMAT_MAJOR_COUNT">SFC_GET_FORMAT_MAJOR_COUNT</A></TD>
Chris@40 122 <TD>Retrieve the number of major formats.</TD>
Chris@40 123 </TR>
Chris@40 124 <TR>
Chris@40 125 <TD><A HREF="#SFC_GET_FORMAT_MAJOR">SFC_GET_FORMAT_MAJOR</A></TD>
Chris@40 126 <TD>Retrieve information about a major format type.</TD>
Chris@40 127 </TR>
Chris@40 128 <TR>
Chris@40 129 <TD><A HREF="#SFC_GET_FORMAT_SUBTYPE_COUNT">SFC_GET_FORMAT_SUBTYPE_COUNT</A></TD>
Chris@40 130 <TD>Retrieve the number of subformats.</TD>
Chris@40 131 </TR>
Chris@40 132 <TR>
Chris@40 133 <TD><A HREF="#SFC_GET_FORMAT_SUBTYPE">SFC_GET_FORMAT_SUBTYPE</A></TD>
Chris@40 134 <TD>Retrieve information about a subformat.</TD>
Chris@40 135 </TR>
Chris@40 136
Chris@40 137 <TR>
Chris@40 138 <TD><A HREF="#SFC_SET_ADD_PEAK_CHUNK">SFC_SET_ADD_PEAK_CHUNK</A></TD>
Chris@40 139 <TD>Switch the code for adding the PEAK chunk to WAV and AIFF files on or off.</TD>
Chris@40 140 </TR>
Chris@40 141
Chris@40 142 <TR>
Chris@40 143 <TD><A HREF="#SFC_UPDATE_HEADER_NOW">SFC_UPDATE_HEADER_NOW</A></TD>
Chris@40 144 <TD>Used when a file is open for write, this command will update the file
Chris@40 145 header to reflect the data written so far.</TD>
Chris@40 146 </TR>
Chris@40 147 <TR>
Chris@40 148 <TD><A HREF="#SFC_SET_UPDATE_HEADER_AUTO">SFC_SET_UPDATE_HEADER_AUTO</A></TD>
Chris@40 149 <TD>Used when a file is open for write, this command will cause the file header
Chris@40 150 to be updated after each write to the file.</TD>
Chris@40 151 </TR>
Chris@40 152
Chris@40 153 <TR>
Chris@40 154 <TD><A HREF="#SFC_FILE_TRUNCATE">SFC_FILE_TRUNCATE</A></TD>
Chris@40 155 <TD>Truncate a file open for write or for read/write.</TD>
Chris@40 156 </TR>
Chris@40 157
Chris@40 158 <TR>
Chris@40 159 <TD><A HREF="#SFC_SET_RAW_START_OFFSET">SFC_SET_RAW_START_OFFSET</A></TD>
Chris@40 160 <TD>Change the data start offset for files opened up as SF_FORMAT_RAW.</TD>
Chris@40 161 </TR>
Chris@40 162
Chris@40 163 <TR>
Chris@40 164 <TD><A HREF="#SFC_SET_CLIPPING">SFC_SET_CLIPPING</A></TD>
Chris@40 165 <TD>Turn on/off automatic clipping when doing floating point to integer
Chris@40 166 conversion.</TD>
Chris@40 167 </TR>
Chris@40 168
Chris@40 169 <TR>
Chris@40 170 <TD><A HREF="#SFC_GET_CLIPPING">SFC_GET_CLIPPING</A></TD>
Chris@40 171 <TD>Retrieve current clipping setting.</TD>
Chris@40 172 </TR>
Chris@40 173
Chris@40 174 <TR>
Chris@40 175 <TD><A HREF="#SFC_GET_EMBED_FILE_INFO">SFC_GET_EMBED_FILE_INFO</A></TD>
Chris@40 176 <TD>Retrieve information about audio files embedded inside other files.</TD>
Chris@40 177 </TR>
Chris@40 178
Chris@40 179 <TR>
Chris@40 180 <TD><A HREF="#SFC_WAVEX_GET_AMBISONIC">SFC_GET_AMBISONIC</A></TD>
Chris@40 181 <TD>Test a WAVEX file for Ambisonic format</TD>
Chris@40 182 </TR>
Chris@40 183
Chris@40 184 <TR>
Chris@40 185 <TD><A HREF="#SFC_WAVEX_SET_AMBISONIC">SFC_SET_AMBISONIC</A></TD>
Chris@40 186 <TD>Modify a WAVEX header for Ambisonic format</TD>
Chris@40 187 </TR>
Chris@40 188
Chris@40 189 <TR>
Chris@40 190 <TD><A HREF="#SFC_SET_VBR_ENCODING_QUALITY">SFC_SET_VBR_ENCODING_QUALITY</A></TD>
Chris@40 191 <TD>Set the Variable Bit Rate encoding quality</TD>
Chris@40 192 </TR>
Chris@40 193
Chris@40 194 <TR>
Chris@40 195 <TD><A HREF="#SFC_SET_COMPRESSION_LEVEL">SFC_SET_COMPRESSION_LEVEL</A></TD>
Chris@40 196 <TD>Set the compression level.</TD>
Chris@40 197 </TR>
Chris@40 198
Chris@40 199 <TR>
Chris@40 200 <TD><A HREF="#SFC_RAW_NEEDS_ENDSWAP">SFC_RAW_NEEDS_ENDSWAP</a></td>
Chris@40 201 <TD>Determine if raw data needs endswapping</TD>
Chris@40 202 </TR>
Chris@40 203
Chris@40 204 <TR>
Chris@40 205 <TD><A HREF="#SFC_GET_BROADCAST_INFO">SFC_GET_BROADCAST_INFO</A></TD>
Chris@40 206 <TD>Retrieve the Broadcast Chunk info</TD>
Chris@40 207 </TR>
Chris@40 208
Chris@40 209 <TR>
Chris@40 210 <TD><A HREF="#SFC_SET_BROADCAST_INFO">SFC_SET_BROADCAST_INFO</A></TD>
Chris@40 211 <TD>Set the Broadcast Chunk info</TD>
Chris@40 212 </TR>
Chris@40 213
Chris@40 214 <TR>
Chris@40 215 <TD><A HREF="#SFC_SET_CART_INFO">SFC_SET_CART_INFO</A></TD>
Chris@40 216 <TD>Set the Cart Chunk info</TD>
Chris@40 217 </TR>
Chris@40 218
Chris@40 219 <TR>
Chris@40 220 <TD><A HREF="#SFC_GET_CART_INFO">SFC_GET_CART_INFO</A></TD>
Chris@40 221 <TD>Retrieve the Cart Chunk info</TD>
Chris@40 222 </TR>
Chris@40 223
Chris@40 224 <TR>
Chris@40 225 <TD><A HREF="#SFC_GET_LOOP_INFO">SFC_GET_LOOP_INFO</A></TD>
Chris@40 226 <TD>Get loop info</TD>
Chris@40 227 </TR>
Chris@40 228
Chris@40 229 <TR>
Chris@40 230 <TD><A HREF="#SFC_GET_INSTRUMENT">SFC_GET_INSTRUMENT</A></TD>
Chris@40 231 <TD>Get instrument info</TD>
Chris@40 232 </TR>
Chris@40 233
Chris@40 234 <TR>
Chris@40 235 <TD><A HREF="#SFC_SET_INSTRUMENT">SFC_SET_INSTRUMENT</A></TD>
Chris@40 236 <TD>Set instrument info</TD>
Chris@40 237 </TR>
Chris@40 238
Chris@40 239 <TR>
Chris@40 240 <TD><A HREF="#SFC_GET_CUE_COUNT">SFC_GET_CUE_COUNT</A></TD>
Chris@40 241 <TD>Get the cue marker count</TD>
Chris@40 242 </TR>
Chris@40 243
Chris@40 244 <TR>
Chris@40 245 <TD><A HREF="#SFC_GET_CUE">SFC_GET_CUE</A></TD>
Chris@40 246 <TD>Get cue marker info</TD>
Chris@40 247 </TR>
Chris@40 248
Chris@40 249 <TR>
Chris@40 250 <TD><A HREF="#SFC_SET_CUE">SFC_SET_CUE</A></TD>
Chris@40 251 <TD>Set cue marker info</TD>
Chris@40 252 </TR>
Chris@40 253
Chris@40 254 <TR>
Chris@40 255 <TD><A HREF="#SFC_RF64_AUTO_DOWNGRADE">SFC_RF64_AUTO_DOWNGRADE</A></TD>
Chris@40 256 <TD>Enable auto downgrade from RF64 to WAV</TD>
Chris@40 257 </TR>
Chris@40 258
Chris@40 259 <!--
Chris@40 260 <TR>
Chris@40 261 <TD><A HREF="#add-dither">add dither</A></TD>
Chris@40 262 <TD>Add dither to output on write.</TD>
Chris@40 263 </TR>
Chris@40 264 -->
Chris@40 265 </TABLE>
Chris@40 266 </CENTER>
Chris@40 267
Chris@40 268 <BR><BR>
Chris@40 269
Chris@40 270 <HR>
Chris@40 271
Chris@40 272 <!-- ========================================================================= -->
Chris@40 273 <A NAME="SFC_GET_LIB_VERSION"></A>
Chris@40 274 <H2><BR><B>SFC_GET_LIB_VERSION</B></H2>
Chris@40 275 <P>
Chris@40 276 Retrieve the version of the library as a string.
Chris@40 277 </P>
Chris@40 278 <P>
Chris@40 279 Parameters:
Chris@40 280 <PRE>
Chris@40 281 sndfile : Not used
Chris@40 282 cmd : SFC_GET_LIB_VERSION
Chris@40 283 data : A pointer to a char buffer
Chris@40 284 datasize : The size of the buffer
Chris@40 285 </PRE>
Chris@40 286 <P>
Chris@40 287 Example:
Chris@40 288 </P>
Chris@40 289 <PRE>
Chris@40 290 char buffer [128] ;
Chris@40 291 sf_command (NULL, SFC_GET_LIB_VERSION, buffer, sizeof (buffer)) ;
Chris@40 292 </PRE>
Chris@40 293
Chris@40 294 <DL>
Chris@40 295 <DT>Return value:</DT>
Chris@40 296 <DD><DD>This call will return the length of the retrieved version string.
Chris@40 297 </DL>
Chris@40 298 <DL>
Chris@40 299 <DT>Notes:</DT>
Chris@40 300 <DD>
Chris@40 301 The string returned in the buffer passed to this function will not overflow
Chris@40 302 the buffer and will always be null terminated .
Chris@40 303 </DL>
Chris@40 304
Chris@40 305 <!-- ========================================================================= -->
Chris@40 306 <A NAME="SFC_GET_LOG_INFO"></A>
Chris@40 307 <H2><BR><B>SFC_GET_LOG_INFO</B></H2>
Chris@40 308 <P>
Chris@40 309 Retrieve the log buffer generated when opening a file as a string. This log
Chris@40 310 buffer can often contain a good reason for why libsndfile failed to open a
Chris@40 311 particular file.
Chris@40 312 </P>
Chris@40 313 <P>
Chris@40 314 Parameters:
Chris@40 315 <PRE>
Chris@40 316 sndfile : A valid SNDFILE* pointer
Chris@40 317 cmd : SFC_GET_LOG_INFO
Chris@40 318 data : A pointer to a char buffer
Chris@40 319 datasize : The size of the buffer
Chris@40 320 </PRE>
Chris@40 321 <P>
Chris@40 322 Example:
Chris@40 323 </P>
Chris@40 324 <PRE>
Chris@40 325 char buffer [2048] ;
Chris@40 326 sf_command (sndfile, SFC_GET_LOG_INFO, buffer, sizeof (buffer)) ;
Chris@40 327 </PRE>
Chris@40 328
Chris@40 329 <DL>
Chris@40 330 <DT>Return value:</DT>
Chris@40 331 <DD><DD>This call will return the length of the retrieved version string.
Chris@40 332 </DL>
Chris@40 333 <DL>
Chris@40 334 <DT>Notes:</DT>
Chris@40 335 <DD>
Chris@40 336 The string returned in the buffer passed to this function will not overflow
Chris@40 337 the buffer and will always be null terminated .
Chris@40 338 </DL>
Chris@40 339
Chris@40 340 <!-- ========================================================================= -->
Chris@40 341 <A NAME="SFC_CALC_SIGNAL_MAX"></A>
Chris@40 342 <H2><BR><B>SFC_CALC_SIGNAL_MAX</B></H2>
Chris@40 343 <P>
Chris@40 344 Retrieve the measured maximum signal value. This involves reading through
Chris@40 345 the whole file which can be slow on large files.
Chris@40 346 </P>
Chris@40 347 <P>
Chris@40 348 Parameters:
Chris@40 349 <PRE>
Chris@40 350 sndfile : A valid SNDFILE* pointer
Chris@40 351 cmd : SFC_CALC_SIGNAL_MAX
Chris@40 352 data : A pointer to a double
Chris@40 353 datasize : sizeof (double)
Chris@40 354 </PRE>
Chris@40 355 <P>
Chris@40 356 Example:
Chris@40 357 </P>
Chris@40 358 <PRE>
Chris@40 359 double max_val ;
Chris@40 360 sf_command (sndfile, SFC_CALC_SIGNAL_MAX, &amp;max_val, sizeof (max_val)) ;
Chris@40 361 </PRE>
Chris@40 362
Chris@40 363 <DL>
Chris@40 364 <DT>Return value:</DT>
Chris@40 365 <DD><DD>Zero on success, non-zero otherwise.
Chris@40 366 </DL>
Chris@40 367
Chris@40 368 <!-- ========================================================================= -->
Chris@40 369 <A NAME="SFC_CALC_NORM_SIGNAL_MAX"></A>
Chris@40 370 <H2><BR><B>SFC_CALC_NORM_SIGNAL_MAX</B></H2>
Chris@40 371 <P>
Chris@40 372 Retrieve the measured normalised maximum signal value. This involves reading
Chris@40 373 through the whole file which can be slow on large files.
Chris@40 374 </P>
Chris@40 375 <P>
Chris@40 376 Parameters:
Chris@40 377 <PRE>
Chris@40 378 sndfile : A valid SNDFILE* pointer
Chris@40 379 cmd : SFC_CALC_NORM_SIGNAL_MAX
Chris@40 380 data : A pointer to a double
Chris@40 381 datasize : sizeof (double)
Chris@40 382 </PRE>
Chris@40 383 <P>
Chris@40 384 Example:
Chris@40 385 </P>
Chris@40 386 <PRE>
Chris@40 387 double max_val ;
Chris@40 388 sf_command (sndfile, SFC_CALC_NORM_SIGNAL_MAX, &amp;max_val, sizeof (max_val)) ;
Chris@40 389 </PRE>
Chris@40 390
Chris@40 391 <DL>
Chris@40 392 <DT>Return value:</DT>
Chris@40 393 <DD><DD>Zero on success, non-zero otherwise.
Chris@40 394 </DL>
Chris@40 395
Chris@40 396 <!-- ========================================================================= -->
Chris@40 397 <A NAME="SFC_CALC_MAX_ALL_CHANNELS"></A>
Chris@40 398 <H2><BR><B>SFC_CALC_MAX_ALL_CHANNELS</B></H2>
Chris@40 399 <P>
Chris@40 400 Calculate the peak value (ie a single number) for each channel.
Chris@40 401 This involves reading through the whole file which can be slow on large files.
Chris@40 402 </P>
Chris@40 403 <P>
Chris@40 404 Parameters:
Chris@40 405 <PRE>
Chris@40 406 sndfile : A valid SNDFILE* pointer
Chris@40 407 cmd : SFC_CALC_MAX_ALL_CHANNELS
Chris@40 408 data : A pointer to a double
Chris@40 409 datasize : sizeof (double) * number_of_channels
Chris@40 410 </PRE>
Chris@40 411 <P>
Chris@40 412 Example:
Chris@40 413 </P>
Chris@40 414 <PRE>
Chris@40 415 double peaks [number_of_channels] ;
Chris@40 416 sf_command (sndfile, SFC_CALC_MAX_ALL_CHANNELS, peaks, sizeof (peaks)) ;
Chris@40 417 </PRE>
Chris@40 418 <DL>
Chris@40 419 <DT>Return value:</DT>
Chris@40 420 <DD>Zero if peaks have been calculated successfully and non-zero otherwise.
Chris@40 421 </DL>
Chris@40 422
Chris@40 423
Chris@40 424 <!-- ========================================================================= -->
Chris@40 425 <A NAME="SFC_CALC_NORM_MAX_ALL_CHANNELS"></A>
Chris@40 426 <H2><BR><B>SFC_CALC_NORM_MAX_ALL_CHANNELS</B></H2>
Chris@40 427 <P>
Chris@40 428 Calculate the normalised peak for each channel.
Chris@40 429 This involves reading through the whole file which can be slow on large files.
Chris@40 430 </P>
Chris@40 431 <P>
Chris@40 432 Parameters:
Chris@40 433 <PRE>
Chris@40 434 sndfile : A valid SNDFILE* pointer
Chris@40 435 cmd : SFC_CALC_NORM_MAX_ALL_CHANNELS
Chris@40 436 data : A pointer to a double
Chris@40 437 datasize : sizeof (double) * number_of_channels
Chris@40 438 </PRE>
Chris@40 439 <P>
Chris@40 440 Example:
Chris@40 441 </P>
Chris@40 442 <PRE>
Chris@40 443 double peaks [number_of_channels] ;
Chris@40 444 sf_command (sndfile, SFC_CALC_NORM_MAX_ALL_CHANNELS, peaks, sizeof (peaks)) ;
Chris@40 445 </PRE>
Chris@40 446 <DL>
Chris@40 447 <DT>Return value:</DT>
Chris@40 448 <DD>Zero if peaks have been calculated successfully and non-zero otherwise.
Chris@40 449 </DL>
Chris@40 450
Chris@40 451
Chris@40 452
Chris@40 453
Chris@40 454 <!-- ========================================================================= -->
Chris@40 455 <A NAME="SFC_GET_SIGNAL_MAX"></A>
Chris@40 456 <H2><BR><B>SFC_GET_SIGNAL_MAX</B></H2>
Chris@40 457 <P>
Chris@40 458 Retrieve the peak value for the file as stored in the file header.
Chris@40 459 </P>
Chris@40 460 <P>
Chris@40 461 Parameters:
Chris@40 462 <PRE>
Chris@40 463 sndfile : A valid SNDFILE* pointer
Chris@40 464 cmd : SFC_GET_SIGNAL_MAX
Chris@40 465 data : A pointer to a double
Chris@40 466 datasize : sizeof (double)
Chris@40 467 </PRE>
Chris@40 468 <P>
Chris@40 469 Example:
Chris@40 470 </P>
Chris@40 471 <PRE>
Chris@40 472 double max_peak ;
Chris@40 473 sf_command (sndfile, SFC_GET_SIGNAL_MAX, &amp;max_peak, sizeof (max_peak)) ;
Chris@40 474 </PRE>
Chris@40 475 <DL>
Chris@40 476 <DT>Return value:</DT>
Chris@40 477 <DD>SF_TRUE if the file header contained the peak value. SF_FALSE otherwise.
Chris@40 478 </DL>
Chris@40 479
Chris@40 480 <!-- ========================================================================= -->
Chris@40 481 <A NAME="SFC_GET_MAX_ALL_CHANNELS"></A>
Chris@40 482 <H2><BR><B>SFC_GET_MAX_ALL_CHANNELS</B></H2>
Chris@40 483 <P>
Chris@40 484 Retrieve the peak value for the file as stored in the file header.
Chris@40 485 </P>
Chris@40 486 <P>
Chris@40 487 Parameters:
Chris@40 488 <PRE>
Chris@40 489 sndfile : A valid SNDFILE* pointer
Chris@40 490 cmd : SFC_GET_SIGNAL_MAX
Chris@40 491 data : A pointer to an array of doubles
Chris@40 492 datasize : sizeof (double) * number_of_channels
Chris@40 493 </PRE>
Chris@40 494 <P>
Chris@40 495 Example:
Chris@40 496 </P>
Chris@40 497 <PRE>
Chris@40 498 double peaks [number_of_channels] ;
Chris@40 499 sf_command (sndfile, SFC_GET_MAX_ALL_CHANNELS, peaks, sizeof (peaks)) ;
Chris@40 500 </PRE>
Chris@40 501 <DL>
Chris@40 502 <DT>Return value:</DT>
Chris@40 503 <DD>SF_TRUE if the file header contains per channel peak values for the file.
Chris@40 504 SF_FALSE otherwise.
Chris@40 505 </DL>
Chris@40 506
Chris@40 507
Chris@40 508 <!-- ========================================================================= -->
Chris@40 509 <A NAME="SFC_SET_NORM_FLOAT"></A>
Chris@40 510 <H2><BR><B>SFC_SET_NORM_FLOAT</B></H2>
Chris@40 511 <P>
Chris@40 512 This command only affects data read from or written to using the floating point functions:
Chris@40 513 </P>
Chris@40 514 <PRE>
Chris@40 515 size_t <A HREF="api.html#read">sf_read_float</A> (SNDFILE *sndfile, float *ptr, size_t items) ;
Chris@40 516 size_t <A HREF="api.html#readf">sf_readf_float</A> (SNDFILE *sndfile, float *ptr, size_t frames) ;
Chris@40 517
Chris@40 518 size_t <A HREF="api.html#write">sf_write_float</A> (SNDFILE *sndfile, float *ptr, size_t items) ;
Chris@40 519 size_t <A HREF="api.html#writef">sf_writef_float</A> (SNDFILE *sndfile, float *ptr, size_t frames) ;
Chris@40 520 </PRE>
Chris@40 521 <P>
Chris@40 522 Parameters:
Chris@40 523 </P>
Chris@40 524 <PRE>
Chris@40 525 sndfile : A valid SNDFILE* pointer
Chris@40 526 cmd : SFC_SET_NORM_FLOAT
Chris@40 527 data : NULL
Chris@40 528 datasize : SF_TRUE or SF_FALSE
Chris@40 529 </PRE>
Chris@40 530 <P>
Chris@40 531 For read operations setting normalisation to SF_TRUE means that the data from all
Chris@40 532 subsequent reads will be be normalised to the range [-1.0, 1.0].
Chris@40 533 </P>
Chris@40 534 <P>
Chris@40 535 For write operations, setting normalisation to SF_TRUE means than all data supplied
Chris@40 536 to the float write functions should be in the range [-1.0, 1.0] and will be scaled
Chris@40 537 for the file format as necessary.
Chris@40 538 </P>
Chris@40 539 <P>
Chris@40 540 For both cases, setting normalisation to SF_FALSE means that no scaling will take place.
Chris@40 541 </P>
Chris@40 542 <P>
Chris@40 543 Example:
Chris@40 544 </P>
Chris@40 545 <PRE>
Chris@40 546 sf_command (sndfile, SFC_SET_NORM_FLOAT, NULL, SF_TRUE) ;
Chris@40 547
Chris@40 548 sf_command (sndfile, SFC_SET_NORM_FLOAT, NULL, SF_FALSE) ;
Chris@40 549 </PRE>
Chris@40 550 <DL>
Chris@40 551 <DT>Return value: </DT>
Chris@40 552 <DD>Returns the previous float normalisation mode.
Chris@40 553 </DL>
Chris@40 554
Chris@40 555 <!-- ========================================================================= -->
Chris@40 556 <A NAME="SFC_SET_NORM_DOUBLE"></A>
Chris@40 557 <H2><BR><B>SFC_SET_NORM_DOUBLE</B></H2>
Chris@40 558 <P>
Chris@40 559 This command only affects data read from or written to using the double precision
Chris@40 560 floating point functions:
Chris@40 561 </P>
Chris@40 562 <PRE>
Chris@40 563 size_t <A HREF="api.html#read">sf_read_double</A> (SNDFILE *sndfile, double *ptr, size_t items) ;
Chris@40 564 size_t <A HREF="api.html#readf">sf_readf_double</A> (SNDFILE *sndfile, double *ptr, size_t frames) ;
Chris@40 565
Chris@40 566 size_t <A HREF="api.html#write">sf_write_double</A> (SNDFILE *sndfile, double *ptr, size_t items) ;
Chris@40 567 size_t <A HREF="api.html#writef">sf_writef_double</A> (SNDFILE *sndfile, double *ptr, size_t frames) ;
Chris@40 568 </PRE>
Chris@40 569 <P>
Chris@40 570 Parameters:
Chris@40 571 </P>
Chris@40 572 <PRE>
Chris@40 573 sndfile : A valid SNDFILE* pointer
Chris@40 574 cmd : SFC_SET_NORM_DOUBLE
Chris@40 575 data : NULL
Chris@40 576 datasize : SF_TRUE or SF_FALSE
Chris@40 577 </PRE>
Chris@40 578 <P>
Chris@40 579 For read operations setting normalisation to SF_TRUE means that the data
Chris@40 580 from all subsequent reads will be be normalised to the range [-1.0, 1.0].
Chris@40 581 </P>
Chris@40 582 <P>
Chris@40 583 For write operations, setting normalisation to SF_TRUE means than all data supplied
Chris@40 584 to the double write functions should be in the range [-1.0, 1.0] and will be scaled
Chris@40 585 for the file format as necessary.
Chris@40 586 </P>
Chris@40 587 <P>
Chris@40 588 For both cases, setting normalisation to SF_FALSE means that no scaling will take place.
Chris@40 589 </P>
Chris@40 590 <P>
Chris@40 591 Example:
Chris@40 592 </P>
Chris@40 593 <PRE>
Chris@40 594 sf_command (sndfile, SFC_SET_NORM_DOUBLE, NULL, SF_TRUE) ;
Chris@40 595
Chris@40 596 sf_command (sndfile, SFC_SET_NORM_DOUBLE, NULL, SF_FALSE) ;
Chris@40 597 </PRE>
Chris@40 598 <DL>
Chris@40 599 <DT>Return value: </DT>
Chris@40 600 <DD>Returns the previous double normalisation mode.
Chris@40 601 </DL>
Chris@40 602
Chris@40 603 <!-- ========================================================================= -->
Chris@40 604 <A NAME="SFC_GET_NORM_FLOAT"></A>
Chris@40 605 <H2><BR><B>SFC_GET_NORM_FLOAT</B></H2>
Chris@40 606 <P>
Chris@40 607 Retrieve the current float normalisation mode.
Chris@40 608 </P>
Chris@40 609 <P>
Chris@40 610 Parameters:
Chris@40 611 </P>
Chris@40 612 <PRE>
Chris@40 613 sndfile : A valid SNDFILE* pointer
Chris@40 614 cmd : SFC_GET_NORM_FLOAT
Chris@40 615 data : NULL
Chris@40 616 datasize : anything
Chris@40 617 </PRE>
Chris@40 618 <P>
Chris@40 619 Example:
Chris@40 620 </P>
Chris@40 621 <PRE>
Chris@40 622 normalisation = sf_command (sndfile, SFC_GET_NORM_FLOAT, NULL, 0) ;
Chris@40 623 </PRE>
Chris@40 624 <DL>
Chris@40 625 <DT>Return value: </DT>
Chris@40 626 <DD>Returns TRUE if normalisation is on and FALSE otherwise.
Chris@40 627 </DL>
Chris@40 628
Chris@40 629 <!-- ========================================================================= -->
Chris@40 630 <A NAME="SFC_GET_NORM_DOUBLE"></A>
Chris@40 631 <H2><BR><B>SFC_GET_NORM_DOUBLE</B></H2>
Chris@40 632 <P>
Chris@40 633 Retrieve the current float normalisation mode.
Chris@40 634 </P>
Chris@40 635 <P>
Chris@40 636 Parameters:
Chris@40 637 </P>
Chris@40 638 <PRE>
Chris@40 639 sndfile : A valid SNDFILE* pointer
Chris@40 640 cmd : SFC_GET_NORM_DOUBLE
Chris@40 641 data : NULL
Chris@40 642 datasize : anything
Chris@40 643 </PRE>
Chris@40 644 <P>
Chris@40 645 Example:
Chris@40 646 </P>
Chris@40 647 <PRE>
Chris@40 648 normalisation = sf_command (sndfile, SFC_GET_NORM_DOUBLE, NULL, 0) ;
Chris@40 649 </PRE>
Chris@40 650 <DL>
Chris@40 651 <DT>Return value: </DT>
Chris@40 652 <DD>Returns TRUE if normalisation is on and FALSE otherwise.
Chris@40 653 </DL>
Chris@40 654
Chris@40 655
Chris@40 656 <!-- ========================================================================= -->
Chris@40 657 <A NAME="SFC_SET_SCALE_FLOAT_INT_READ"></A>
Chris@40 658 <H2><BR><B>SFC_SET_SCALE_FLOAT_INT_READ</B></H2>
Chris@40 659 <P>
Chris@40 660 Set/clear the scale factor when integer (short/int) data is read from a file
Chris@40 661 containing floating point data.
Chris@40 662 </P>
Chris@40 663 <P>
Chris@40 664 Parameters:
Chris@40 665 </P>
Chris@40 666 <PRE>
Chris@40 667 sndfile : A valid SNDFILE* pointer
Chris@40 668 cmd : SFC_SET_SCALE_FLOAT_INT_READ
Chris@40 669 data : NULL
Chris@40 670 datasize : TRUE or FALSE
Chris@40 671 </PRE>
Chris@40 672 <P>
Chris@40 673 Example:
Chris@40 674 </P>
Chris@40 675 <PRE>
Chris@40 676 sf_command (sndfile, SFC_SET_SCALE_FLOAT_INT_READ, NULL, SF_TRUE) ;
Chris@40 677 </PRE>
Chris@40 678 <DL>
Chris@40 679 <DT>Return value: </DT>
Chris@40 680 <DD>Returns the previous SFC_SET_SCALE_FLOAT_INT_READ setting for this file.
Chris@40 681 </DL>
Chris@40 682
Chris@40 683
Chris@40 684 <!-- ========================================================================= -->
Chris@40 685 <A NAME="SFC_SET_SCALE_INT_FLOAT_WRITE"></A>
Chris@40 686 <H2><BR><B>SFC_SET_SCALE_INT_FLOAT_WRITE</B></H2>
Chris@40 687 <P>
Chris@40 688 Set/clear the scale factor when integer (short/int) data is written to a file
Chris@40 689 as floating point data.
Chris@40 690 </P>
Chris@40 691 <P>
Chris@40 692 Parameters:
Chris@40 693 </P>
Chris@40 694 <PRE>
Chris@40 695 sndfile : A valid SNDFILE* pointer
Chris@40 696 cmd : SFC_SET_SCALE_FLOAT_INT_READ
Chris@40 697 data : NULL
Chris@40 698 datasize : TRUE or FALSE
Chris@40 699 </PRE>
Chris@40 700 <P>
Chris@40 701 Example:
Chris@40 702 </P>
Chris@40 703 <PRE>
Chris@40 704 sf_command (sndfile, SFC_SET_SCALE_INT_FLOAT_WRITE, NULL, SF_TRUE) ;
Chris@40 705 </PRE>
Chris@40 706 <DL>
Chris@40 707 <DT>Return value: </DT>
Chris@40 708 <DD>Returns the previous SFC_SET_SCALE_INT_FLOAT_WRITE setting for this file.
Chris@40 709 </DL>
Chris@40 710
Chris@40 711 <!-- ========================================================================= -->
Chris@40 712 <A NAME="SFC_GET_SIMPLE_FORMAT_COUNT"></A>
Chris@40 713 <H2><BR><B>SFC_GET_SIMPLE_FORMAT_COUNT</B></H2>
Chris@40 714 <P>
Chris@40 715 Retrieve the number of simple formats supported by libsndfile.
Chris@40 716 </P>
Chris@40 717 <P>
Chris@40 718 Parameters:
Chris@40 719 </P>
Chris@40 720 <PRE>
Chris@40 721 sndfile : Not used.
Chris@40 722 cmd : SFC_GET_SIMPLE_FORMAT_COUNT
Chris@40 723 data : a pointer to an int
Chris@40 724 datasize : sizeof (int)
Chris@40 725 </PRE>
Chris@40 726 <P>
Chris@40 727 Example:
Chris@40 728 </P>
Chris@40 729 <PRE>
Chris@40 730 int count ;
Chris@40 731 sf_command (sndfile, SFC_GET_SIMPLE_FORMAT_COUNT, &amp;count, sizeof (int)) ;
Chris@40 732 </PRE>
Chris@40 733 <DL>
Chris@40 734 <DT>Return value: </DT>
Chris@40 735 <DD>0
Chris@40 736 </DL>
Chris@40 737
Chris@40 738 <!-- ========================================================================= -->
Chris@40 739 <A NAME="SFC_GET_SIMPLE_FORMAT"></A>
Chris@40 740 <H2><BR><B>SFC_GET_SIMPLE_FORMAT</B></H2>
Chris@40 741 <P>
Chris@40 742 Retrieve information about a simple format.
Chris@40 743 </P>
Chris@40 744 <P>
Chris@40 745 Parameters:
Chris@40 746 </P>
Chris@40 747 <PRE>
Chris@40 748 sndfile : Not used.
Chris@40 749 cmd : SFC_GET_SIMPLE_FORMAT
Chris@40 750 data : a pointer to an SF_FORMAT_INFO struct
Chris@40 751 datasize : sizeof (SF_FORMAT_INFO)
Chris@40 752 </PRE>
Chris@40 753 <P>
Chris@40 754 The SF_FORMAT_INFO struct is defined in &lt;sndfile.h&gt; as:
Chris@40 755 </P>
Chris@40 756 <PRE>
Chris@40 757 typedef struct
Chris@40 758 { int format ;
Chris@40 759 const char *name ;
Chris@40 760 const char *extension ;
Chris@40 761 } SF_FORMAT_INFO ;
Chris@40 762 </PRE>
Chris@40 763 <P>
Chris@40 764 When sf_command() is called with SF_GET_SIMPLE_FORMAT, the value of the format
Chris@40 765 field should be the format number (ie 0 &lt;= format &lt;= count value obtained using
Chris@40 766 SF_GET_SIMPLE_FORMAT_COUNT).
Chris@40 767 </P>
Chris@40 768 <P>
Chris@40 769 Example:
Chris@40 770 </P>
Chris@40 771 <PRE>
Chris@40 772 SF_FORMAT_INFO format_info ;
Chris@40 773 int k, count ;
Chris@40 774
Chris@40 775 sf_command (sndfile, SFC_GET_SIMPLE_FORMAT_COUNT, &amp;count, sizeof (int)) ;
Chris@40 776
Chris@40 777 for (k = 0 ; k &lt; count ; k++)
Chris@40 778 { format_info.format = k ;
Chris@40 779 sf_command (sndfile, SFC_GET_SIMPLE_FORMAT, &amp;format_info, sizeof (format_info)) ;
Chris@40 780 printf ("%08x %s %s\n", format_info.format, format_info.name, format_info.extension) ;
Chris@40 781 } ;
Chris@40 782 </PRE>
Chris@40 783 <DL>
Chris@40 784 <DT>Return value: </DT>
Chris@40 785 <DD>0 on success and non-zero otherwise.
Chris@40 786 <DD>The value of the format field of the SF_FORMAT_INFO struct will be a value which
Chris@40 787 can be placed in the format field of an SF_INFO struct when a file is to be opened
Chris@40 788 for write.
Chris@40 789 <DD>The name field will contain a char* pointer to the name of the string, eg. "WAV (Microsoft 16 bit PCM)".
Chris@40 790 <DD>The extension field will contain the most commonly used file extension for that file type.
Chris@40 791 </DL>
Chris@40 792
Chris@40 793 <!-- ========================================================================= -->
Chris@40 794 <A NAME="SFC_GET_FORMAT_INFO"></A>
Chris@40 795 <H2><BR><B>SFC_GET_FORMAT_INFO</B></H2>
Chris@40 796 <P>
Chris@40 797 Retrieve information about a major or subtype format.
Chris@40 798 </P>
Chris@40 799 <P>
Chris@40 800 Parameters:
Chris@40 801 </P>
Chris@40 802 <PRE>
Chris@40 803 sndfile : Not used.
Chris@40 804 cmd : SFC_GET_FORMAT_INFO
Chris@40 805 data : a pointer to an SF_FORMAT_INFO struct
Chris@40 806 datasize : sizeof (SF_FORMAT_INFO)
Chris@40 807 </PRE>
Chris@40 808 <P>
Chris@40 809 The SF_FORMAT_INFO struct is defined in &lt;sndfile.h&gt; as:
Chris@40 810 </P>
Chris@40 811 <PRE>
Chris@40 812 typedef struct
Chris@40 813 { int format ;
Chris@40 814 const char *name ;
Chris@40 815 const char *extension ;
Chris@40 816 } SF_FORMAT_INFO ;
Chris@40 817 </PRE>
Chris@40 818 <P>
Chris@40 819 When sf_command() is called with SF_GET_FORMAT_INFO, the format field is
Chris@40 820 examined and if (format &amp; SF_FORMAT_TYPEMASK) is a valid format then the struct
Chris@40 821 is filled in with information about the given major type.
Chris@40 822 If (format &amp; SF_FORMAT_TYPEMASK) is FALSE and (format &amp; SF_FORMAT_SUBMASK) is a
Chris@40 823 valid subtype format then the struct is filled in with information about the given
Chris@40 824 subtype.
Chris@40 825 </P>
Chris@40 826 <P>
Chris@40 827 Example:
Chris@40 828 </P>
Chris@40 829 <PRE>
Chris@40 830 SF_FORMAT_INFO format_info ;
Chris@40 831
Chris@40 832 format_info.format = SF_FORMAT_WAV ;
Chris@40 833 sf_command (sndfile, SFC_GET_FORMAT_INFO, &amp;format_info, sizeof (format_info)) ;
Chris@40 834 printf ("%08x %s %s\n", format_info.format, format_info.name, format_info.extension) ;
Chris@40 835
Chris@40 836 format_info.format = SF_FORMAT_ULAW ;
Chris@40 837 sf_command (sndfile, SFC_GET_FORMAT_INFO, &amp;format_info, sizeof (format_info)) ;
Chris@40 838 printf ("%08x %s\n", format_info.format, format_info.name) ;
Chris@40 839 </PRE>
Chris@40 840 <DL>
Chris@40 841 <DT>Return value: </DT>
Chris@40 842 <DD>0 on success and non-zero otherwise.
Chris@40 843 </DL>
Chris@40 844 <!-- ========================================================================= -->
Chris@40 845 <A NAME="SFC_GET_FORMAT_MAJOR_COUNT"></A>
Chris@40 846 <H2><BR><B>SFC_GET_FORMAT_MAJOR_COUNT</B></H2>
Chris@40 847 <P>
Chris@40 848 Retrieve the number of major formats.
Chris@40 849 </P>
Chris@40 850 <P>
Chris@40 851 Parameters:
Chris@40 852 </P>
Chris@40 853 <PRE>
Chris@40 854 sndfile : Not used.
Chris@40 855 cmd : SFC_GET_FORMAT_MAJOR_COUNT
Chris@40 856 data : a pointer to an int
Chris@40 857 datasize : sizeof (int)
Chris@40 858 </PRE>
Chris@40 859 <P>
Chris@40 860 Example:
Chris@40 861 </P>
Chris@40 862 <PRE>
Chris@40 863 int count ;
Chris@40 864 sf_command (sndfile, SFC_GET_FORMAT_MAJOR_COUNT, &amp;count, sizeof (int)) ;
Chris@40 865 </PRE>
Chris@40 866 <DL>
Chris@40 867 <DT>Return value: </DT>
Chris@40 868 <DD>0
Chris@40 869 </DL>
Chris@40 870
Chris@40 871 <!-- ========================================================================= -->
Chris@40 872 <A NAME="SFC_GET_FORMAT_MAJOR"></A>
Chris@40 873 <H2><BR><B>SFC_GET_FORMAT_MAJOR</B></H2>
Chris@40 874 <P>
Chris@40 875 Retrieve information about a major format type.
Chris@40 876 </P>
Chris@40 877 <P>
Chris@40 878 Parameters:
Chris@40 879 </P>
Chris@40 880 <PRE>
Chris@40 881 sndfile : Not used.
Chris@40 882 cmd : SFC_GET_FORMAT_MAJOR
Chris@40 883 data : a pointer to an SF_FORMAT_INFO struct
Chris@40 884 datasize : sizeof (SF_FORMAT_INFO)
Chris@40 885 </PRE>
Chris@40 886 <P>
Chris@40 887 Example:
Chris@40 888 </P>
Chris@40 889 <PRE>
Chris@40 890 SF_FORMAT_INFO format_info ;
Chris@40 891 int k, count ;
Chris@40 892
Chris@40 893 sf_command (sndfile, SFC_GET_FORMAT_MAJOR_COUNT, &amp;count, sizeof (int)) ;
Chris@40 894
Chris@40 895 for (k = 0 ; k &lt; count ; k++)
Chris@40 896 { format_info.format = k ;
Chris@40 897 sf_command (sndfile, SFC_GET_FORMAT_MAJOR, &amp;format_info, sizeof (format_info)) ;
Chris@40 898 printf ("%08x %s %s\n", format_info.format, format_info.name, format_info.extension) ;
Chris@40 899 } ;
Chris@40 900 </PRE>
Chris@40 901 <P>
Chris@40 902 For a more comprehensive example, see the program list_formats.c in the examples/
Chris@40 903 directory of the libsndfile source code distribution.
Chris@40 904 </P>
Chris@40 905 <DL>
Chris@40 906 <DT>Return value: </DT>
Chris@40 907 <DD>0 on success and non-zero otherwise.
Chris@40 908 <DD>The value of the format field will be one of the major format identifiers such as
Chris@40 909 SF_FORMAT_WAV or SF_FORMAT_AIFF.
Chris@40 910 <DD>The name field will contain a char* pointer to the name of the string, eg. "WAV (Microsoft)".
Chris@40 911 <DD>The extension field will contain the most commonly used file extension for that file type.
Chris@40 912 </DL>
Chris@40 913
Chris@40 914 <!-- ========================================================================= -->
Chris@40 915 <A NAME="SFC_GET_FORMAT_SUBTYPE_COUNT"></A>
Chris@40 916 <H2><BR><B>SFC_GET_FORMAT_SUBTYPE_COUNT</B></H2>
Chris@40 917 <P>
Chris@40 918 Retrieve the number of subformats.
Chris@40 919 </P>
Chris@40 920 <P>
Chris@40 921 Parameters:
Chris@40 922 </P>
Chris@40 923 <PRE>
Chris@40 924 sndfile : Not used.
Chris@40 925 cmd : SFC_GET_FORMAT_SUBTYPE_COUNT
Chris@40 926 data : a pointer to an int
Chris@40 927 datasize : sizeof (int)
Chris@40 928 </PRE>
Chris@40 929 <P>
Chris@40 930 Example:
Chris@40 931 </P>
Chris@40 932 <PRE>
Chris@40 933 int count ;
Chris@40 934 sf_command (sndfile, SFC_GET_FORMAT_SUBTYPE_COUNT, &amp;count, sizeof (int)) ;
Chris@40 935 </PRE>
Chris@40 936 <DL>
Chris@40 937 <DT>Return value: </DT>
Chris@40 938 <DD>0
Chris@40 939 </DL>
Chris@40 940
Chris@40 941 <!-- ========================================================================= -->
Chris@40 942 <A NAME="SFC_GET_FORMAT_SUBTYPE"></A>
Chris@40 943 <H2><BR><B>SFC_GET_FORMAT_SUBTYPE</B></H2>
Chris@40 944 <P>
Chris@40 945 Enumerate the subtypes (this function does not translate a subtype into
Chris@40 946 a string describing that subtype).
Chris@40 947 A typical use case might be retrieving a string description of all subtypes
Chris@40 948 so that a dialog box can be filled in.
Chris@40 949 </P>
Chris@40 950 <P>
Chris@40 951
Chris@40 952 </P>
Chris@40 953 <P>
Chris@40 954 Parameters:
Chris@40 955 </P>
Chris@40 956 <PRE>
Chris@40 957 sndfile : Not used.
Chris@40 958 cmd : SFC_GET_FORMAT_SUBTYPE
Chris@40 959 data : a pointer to an SF_FORMAT_INFO struct
Chris@40 960 datasize : sizeof (SF_FORMAT_INFO)
Chris@40 961 </PRE>
Chris@40 962 <P>
Chris@40 963 Example 1: Retrieve all sybtypes supported by the WAV format.
Chris@40 964 </P>
Chris@40 965 <PRE>
Chris@40 966 SF_FORMAT_INFO format_info ;
Chris@40 967 int k, count ;
Chris@40 968
Chris@40 969 sf_command (sndfile, SFC_GET_FORMAT_SUBTYPE_COUNT, &amp;count, sizeof (int)) ;
Chris@40 970
Chris@40 971 for (k = 0 ; k &lt; count ; k++)
Chris@40 972 { format_info.format = k ;
Chris@40 973 sf_command (sndfile, SFC_GET_FORMAT_SUBTYPE, &amp;format_info, sizeof (format_info)) ;
Chris@40 974 if (! sf_format_check (format_info.format | SF_FORMAT_WAV))
Chris@40 975 continue ;
Chris@40 976 printf ("%08x %s\n", format_info.format, format_info.name) ;
Chris@40 977 } ;
Chris@40 978 </PRE>
Chris@40 979 <P>
Chris@40 980 Example 2: Print a string describing the SF_FORMAT_PCM_16 subtype.
Chris@40 981 </P>
Chris@40 982 <PRE>
Chris@40 983 SF_FORMAT_INFO format_info ;
Chris@40 984 int k, count ;
Chris@40 985
Chris@40 986 sf_command (sndfile, SFC_GET_FORMAT_SUBTYPE_COUNT, &amp;count, sizeof (int)) ;
Chris@40 987
Chris@40 988 for (k = 0 ; k &lt; count ; k++)
Chris@40 989 { format_info.format = k ;
Chris@40 990 sf_command (sndfile, SFC_GET_FORMAT_SUBTYPE, &amp;format_info, sizeof (format_info)) ;
Chris@40 991 if (format_info.format == SF_FORMAT_PCM_16)
Chris@40 992 { printf ("%08x %s\n", format_info.format, format_info.name) ;
Chris@40 993 break ;
Chris@40 994 } ;
Chris@40 995 } ;
Chris@40 996 </PRE>
Chris@40 997 <P>
Chris@40 998 For a more comprehensive example, see the program list_formats.c in the examples/
Chris@40 999 directory of the libsndfile source code distribution.
Chris@40 1000 </P>
Chris@40 1001 <DL>
Chris@40 1002 <DT>Return value: </DT>
Chris@40 1003 <DD>0 on success and non-zero otherwise.
Chris@40 1004 <DD>The value of the format field will be one of the major format identifiers such as
Chris@40 1005 SF_FORMAT_WAV or SF_FORMAT_AIFF.
Chris@40 1006 <DD>The name field will contain a char* pointer to the name of the string; for instance
Chris@40 1007 "WAV (Microsoft)" or "AIFF (Apple/SGI)".
Chris@40 1008 <DD>The extension field will be a NULL pointer.
Chris@40 1009 </DL>
Chris@40 1010
Chris@40 1011 <!-- ========================================================================= -->
Chris@40 1012 <A NAME="SFC_SET_ADD_PEAK_CHUNK"></A>
Chris@40 1013 <H2><BR><B>SFC_SET_ADD_PEAK_CHUNK</B></H2>
Chris@40 1014 <P>
Chris@40 1015 By default, WAV and AIFF files which contain floating point data (subtype SF_FORMAT_FLOAT
Chris@40 1016 or SF_FORMAT_DOUBLE) have a PEAK chunk.
Chris@40 1017 By using this command, the addition of a PEAK chunk can be turned on or off.
Chris@40 1018 </P>
Chris@40 1019 <P>
Chris@40 1020 Note : This call must be made before any data is written to the file.
Chris@40 1021 </P>
Chris@40 1022 <P>
Chris@40 1023 Parameters:
Chris@40 1024 <PRE>
Chris@40 1025 sndfile : A valid SNDFILE* pointer
Chris@40 1026 cmd : SFC_SET_ADD_PEAK_CHUNK
Chris@40 1027 data : Not used (should be NULL)
Chris@40 1028 datasize : TRUE or FALSE.
Chris@40 1029 </PRE>
Chris@40 1030 <P>
Chris@40 1031 Example:
Chris@40 1032 </P>
Chris@40 1033 <PRE>
Chris@40 1034 /* Turn on the PEAK chunk. */
Chris@40 1035 sf_command (sndfile, SFC_SET_ADD_PEAK_CHUNK, NULL, SF_TRUE) ;
Chris@40 1036
Chris@40 1037 /* Turn off the PEAK chunk. */
Chris@40 1038 sf_command (sndfile, SFC_SET_ADD_PEAK_CHUNK, NULL, SF_FALSE) ;
Chris@40 1039 </PRE>
Chris@40 1040 <DL>
Chris@40 1041 <DT>Return value:</DT>
Chris@40 1042 <DD>Returns SF_TRUE if the peak chunk will be written after this call.
Chris@40 1043 <DD>Returns SF_FALSE if the peak chunk will not be written after this call.
Chris@40 1044 </DL>
Chris@40 1045
Chris@40 1046 <!-- ========================================================================= -->
Chris@40 1047 <A NAME="SFC_UPDATE_HEADER_NOW"></A>
Chris@40 1048 <H2><BR><B>SFC_UPDATE_HEADER_NOW</B></H2>
Chris@40 1049 <P>
Chris@40 1050 The header of an audio file is normally written by libsndfile when the file is
Chris@40 1051 closed using <B>sf_close()</B>.
Chris@40 1052 </P>
Chris@40 1053 <P>
Chris@40 1054 There are however situations where large files are being generated and it would
Chris@40 1055 be nice to have valid data in the header before the file is complete.
Chris@40 1056 Using this command will update the file header to reflect the amount of data written
Chris@40 1057 to the file so far.
Chris@40 1058 Other programs opening the file for read (before any more data is written) will
Chris@40 1059 then read a valid sound file header.
Chris@40 1060 </P>
Chris@40 1061 <P>
Chris@40 1062 Parameters:
Chris@40 1063 <PRE>
Chris@40 1064 sndfile : A valid SNDFILE* pointer
Chris@40 1065 cmd : SFC_UPDATE_HEADER_NOW
Chris@40 1066 data : Not used (should be NULL)
Chris@40 1067 datasize : Not used.
Chris@40 1068 </PRE>
Chris@40 1069 <P>
Chris@40 1070 Example:
Chris@40 1071 </P>
Chris@40 1072 <PRE>
Chris@40 1073 /* Update the header now. */
Chris@40 1074 sf_command (sndfile, SFC_UPDATE_HEADER_NOW, NULL, 0) ;
Chris@40 1075 </PRE>
Chris@40 1076 <DL>
Chris@40 1077 <DT>Return value:</DT>
Chris@40 1078 <DD>0
Chris@40 1079 </DL>
Chris@40 1080
Chris@40 1081 <!-- ========================================================================= -->
Chris@40 1082 <A NAME="SFC_SET_UPDATE_HEADER_AUTO"></A>
Chris@40 1083 <H2><BR><B>SFC_SET_UPDATE_HEADER_AUTO</B></H2>
Chris@40 1084 <P>
Chris@40 1085 Similar to SFC_UPDATE_HEADER_NOW but updates the header at the end of every call
Chris@40 1086 to the <B>sf_write*</B> functions.
Chris@40 1087 </P>
Chris@40 1088 <P>
Chris@40 1089 Parameters:
Chris@40 1090 <PRE>
Chris@40 1091 sndfile : A valid SNDFILE* pointer
Chris@40 1092 cmd : SFC_UPDATE_HEADER_NOW
Chris@40 1093 data : Not used (should be NULL)
Chris@40 1094 datasize : SF_TRUE or SF_FALSE
Chris@40 1095 </PRE>
Chris@40 1096 <P>
Chris@40 1097 Example:
Chris@40 1098 </P>
Chris@40 1099 <PRE>
Chris@40 1100 /* Turn on auto header update. */
Chris@40 1101 sf_command (sndfile, SFC_SET_UPDATE_HEADER_AUTO, NULL, SF_TRUE) ;
Chris@40 1102
Chris@40 1103 /* Turn off auto header update. */
Chris@40 1104 sf_command (sndfile, SFC_SET_UPDATE_HEADER_AUTO, NULL, SF_FALSE) ;
Chris@40 1105 </PRE>
Chris@40 1106 <DL>
Chris@40 1107 <DT>Return value:</DT>
Chris@40 1108 <DD>TRUE if auto update header is now on; FALSE otherwise.
Chris@40 1109 </DL>
Chris@40 1110
Chris@40 1111 <!-- ========================================================================= -->
Chris@40 1112 <A NAME="SFC_FILE_TRUNCATE"></A>
Chris@40 1113 <H2><BR><B>SFC_FILE_TRUNCATE</B></H2>
Chris@40 1114 <P>
Chris@40 1115 Truncate a file that was opened for write or read/write.
Chris@40 1116 </P>
Chris@40 1117 <P>
Chris@40 1118 Parameters:
Chris@40 1119 <PRE>
Chris@40 1120 sndfile : A valid SNDFILE* pointer
Chris@40 1121 cmd : SFC_FILE_TRUNCATE
Chris@40 1122 data : A pointer to an sf_count_t.
Chris@40 1123 datasize : sizeof (sf_count_t)
Chris@40 1124 </PRE>
Chris@40 1125
Chris@40 1126 <P>
Chris@40 1127 Truncate the file to the number of frames specified by the sf_count_t pointed
Chris@40 1128 to by data.
Chris@40 1129 After this command, both the read and the write pointer will be
Chris@40 1130 at the new end of the file.
Chris@40 1131 This command will fail (returning non-zero) if the requested truncate position
Chris@40 1132 is beyond the end of the file.
Chris@40 1133 </P>
Chris@40 1134 <P>
Chris@40 1135 Example:
Chris@40 1136 </P>
Chris@40 1137 <PRE>
Chris@40 1138 /* Truncate the file to a length of 20 frames. */
Chris@40 1139 sf_count_t frames = 20 ;
Chris@40 1140 sf_command (sndfile, SFC_FILE_TRUNCATE, &amp;frames, sizeof (frames)) ;
Chris@40 1141 </PRE>
Chris@40 1142 <DL>
Chris@40 1143 <DT>Return value:</DT>
Chris@40 1144 <DD>Zero on sucess, non-zero otherwise.
Chris@40 1145 </DL>
Chris@40 1146
Chris@40 1147 <!-- ========================================================================= -->
Chris@40 1148 <A NAME="SFC_SET_RAW_START_OFFSET"></A>
Chris@40 1149 <H2><BR><B>SFC_SET_RAW_START_OFFSET</B></H2>
Chris@40 1150 <P>
Chris@40 1151 Change the data start offset for files opened up as SF_FORMAT_RAW.
Chris@40 1152 </P>
Chris@40 1153 <P>
Chris@40 1154 Parameters:
Chris@40 1155 <PRE>
Chris@40 1156 sndfile : A valid SNDFILE* pointer
Chris@40 1157 cmd : SFC_SET_RAW_START_OFFSET
Chris@40 1158 data : A pointer to an sf_count_t.
Chris@40 1159 datasize : sizeof (sf_count_t)
Chris@40 1160 </PRE>
Chris@40 1161
Chris@40 1162 <P>
Chris@40 1163 For a file opened as format SF_FORMAT_RAW, set the data offset to the value
Chris@40 1164 given by data.
Chris@40 1165 </P>
Chris@40 1166 <P>
Chris@40 1167 Example:
Chris@40 1168 </P>
Chris@40 1169 <PRE>
Chris@40 1170 /* Reset the data offset to 5 bytes from the start of the file. */
Chris@40 1171 sf_count_t offset = 5 ;
Chris@40 1172 sf_command (sndfile, SFC_SET_RAW_START_OFFSET, &amp;offset, sizeof (offset)) ;
Chris@40 1173 </PRE>
Chris@40 1174 <DL>
Chris@40 1175 <DT>Return value:</DT>
Chris@40 1176 <DD>Zero on success, non-zero otherwise.
Chris@40 1177 </DL>
Chris@40 1178
Chris@40 1179 <!-- ========================================================================= -->
Chris@40 1180 <A NAME="SFC_SET_CLIPPING"></A>
Chris@40 1181 <H2><BR><B>SFC_SET_CLIPPING</B></H2>
Chris@40 1182 <P>
Chris@40 1183 Turn on/off automatic clipping when doing floating point to integer conversion.
Chris@40 1184 </P>
Chris@40 1185 <P>
Chris@40 1186 Parameters:
Chris@40 1187 <PRE>
Chris@40 1188 sndfile : A valid SNDFILE* pointer
Chris@40 1189 cmd : SFC_SET_CLIPPING
Chris@40 1190 data : NULL
Chris@40 1191 datasize : SF_TRUE or SF_FALSE.
Chris@40 1192 </PRE>
Chris@40 1193
Chris@40 1194 <P>
Chris@40 1195 Turn on (datasize == SF_TRUE) or off (datasize == SF_FALSE) clipping.
Chris@40 1196 </P>
Chris@40 1197 <P>
Chris@40 1198 Example:
Chris@40 1199 </P>
Chris@40 1200 <PRE>
Chris@40 1201 sf_command (sndfile, SFC_SET_CLIPPING, NULL, SF_TRUE) ;
Chris@40 1202 </PRE>
Chris@40 1203 <DL>
Chris@40 1204 <DT>Return value:</DT>
Chris@40 1205 <DD>Clipping mode (SF_TRUE or SF_FALSE).
Chris@40 1206 </DL>
Chris@40 1207
Chris@40 1208
Chris@40 1209 <!-- ========================================================================= -->
Chris@40 1210 <A NAME="SFC_GET_CLIPPING"></A>
Chris@40 1211 <H2><BR><B>SFC_GET_CLIPPING</B></H2>
Chris@40 1212 <P>
Chris@40 1213 Turn on/off automatic clipping when doing floating point to integer conversion.
Chris@40 1214 </P>
Chris@40 1215 <P>
Chris@40 1216 Parameters:
Chris@40 1217 <PRE>
Chris@40 1218 sndfile : A valid SNDFILE* pointer
Chris@40 1219 cmd : SFC_GET_CLIPPING
Chris@40 1220 data : NULL
Chris@40 1221 datasize : 0
Chris@40 1222 </PRE>
Chris@40 1223
Chris@40 1224 <P>
Chris@40 1225 Retrieve the current cliiping setting.
Chris@40 1226 </P>
Chris@40 1227 <P>
Chris@40 1228 Example:
Chris@40 1229 </P>
Chris@40 1230 <PRE>
Chris@40 1231 sf_command (sndfile, SFC_GET_CLIPPING, NULL, 0) ;
Chris@40 1232 </PRE>
Chris@40 1233 <DL>
Chris@40 1234 <DT>Return value:</DT>
Chris@40 1235 <DD>Clipping mode (SF_TRUE or SF_FALSE).
Chris@40 1236 </DL>
Chris@40 1237
Chris@40 1238 <!-- ========================================================================= -->
Chris@40 1239 <A NAME="SFC_GET_EMBED_FILE_INFO"></A>
Chris@40 1240 <H2><BR><B>SFC_GET_EMBED_FILE_INFO</B></H2>
Chris@40 1241 <P>
Chris@40 1242 Get the file offset and file length of a file enbedded within another
Chris@40 1243 larger file.
Chris@40 1244 </P>
Chris@40 1245 <P>
Chris@40 1246 Parameters:
Chris@40 1247 <PRE>
Chris@40 1248 sndfile : A valid SNDFILE* pointer
Chris@40 1249 cmd : SFC_GET_CLIPPING
Chris@40 1250 data : a pointer to an SF_EMBED_FILE_INFO struct
Chris@40 1251 datasize : sizeof (SF_EMBED_FILE_INFO)
Chris@40 1252 </PRE>
Chris@40 1253 <P>
Chris@40 1254 The SF_EMBED_FILE_INFO struct is defined in &lt;sndfile.h&gt; as:
Chris@40 1255 </P>
Chris@40 1256 <PRE>
Chris@40 1257 typedef struct
Chris@40 1258 { sf_count_t offset ;
Chris@40 1259 sf_count_t length ;
Chris@40 1260 } SF_EMBED_FILE_INFO ;
Chris@40 1261 </PRE>
Chris@40 1262 <DL>
Chris@40 1263 <DT>Return value: </DT>
Chris@40 1264 <DD>0 on success and non-zero otherwise.
Chris@40 1265 <DD>The value of the offset field of the SF_EMBED_FILE_INFO struct will be
Chris@40 1266 the offsets in bytes from the start of the outer file to the start of
Chris@40 1267 the audio file.
Chris@40 1268 <DD>The value of the offset field of the SF_EMBED_FILE_INFO struct will be
Chris@40 1269 the length in bytes of the embedded file.
Chris@40 1270 </DL>
Chris@40 1271
Chris@40 1272
Chris@40 1273
Chris@40 1274 <!-- ========================================================================= -->
Chris@40 1275 <A NAME="SFC_WAVEX_GET_AMBISONIC"></A>
Chris@40 1276 <H2><BR><B>SFC_WAVEX_GET_AMBISONIC</B></H2>
Chris@40 1277 <P>
Chris@40 1278 Test if the current file has the GUID of a WAVEX file for any of the Ambisonic
Chris@40 1279 formats.
Chris@40 1280 </P>
Chris@40 1281 <P>
Chris@40 1282 Parameters:
Chris@40 1283 <PRE>
Chris@40 1284 sndfile : A valid SNDFILE* pointer
Chris@40 1285 cmd : SFC_WAVEX_GET_AMBISONIC
Chris@40 1286 data : NULL
Chris@40 1287 datasize : 0
Chris@40 1288 </PRE>
Chris@40 1289 <P>
Chris@40 1290 The Ambisonic WAVEX formats are defined here :
Chris@40 1291 <A HREF="http://dream.cs.bath.ac.uk/researchdev/wave-ex/bformat.html">
Chris@40 1292 http://dream.cs.bath.ac.uk/researchdev/wave-ex/bformat.html</A>.
Chris@40 1293 </P>
Chris@40 1294 <DL>
Chris@40 1295 <DT>Return value: </DT>
Chris@40 1296 <DD>SF_AMBISONIC_NONE or SF_AMBISONIC_B_FORMAT or zero if the file format
Chris@40 1297 does not support ambisonic formats.
Chris@40 1298 </DL>
Chris@40 1299
Chris@40 1300 <!-- ========================================================================= -->
Chris@40 1301 <A NAME="SFC_WAVEX_SET_AMBISONIC"></A>
Chris@40 1302 <H2><BR><B>SFC_WAVEX_SET_AMBISONIC</B></H2>
Chris@40 1303 <P>
Chris@40 1304 Set the GUID of a new WAVEX file to indicate an Ambisonics format.
Chris@40 1305 </P>
Chris@40 1306 <P>
Chris@40 1307 Parameters:
Chris@40 1308 <PRE>
Chris@40 1309 sndfile : A valid SNDFILE* pointer
Chris@40 1310 cmd : SFC_WAVEX_SET_AMBISONIC
Chris@40 1311 data : NULL
Chris@40 1312 datasize : SF_AMBISONIC_NONE or SF_AMBISONIC_B_FORMAT
Chris@40 1313 </PRE>
Chris@40 1314 <P>
Chris@40 1315 Turn on (SF_AMBISONIC_B_FORMAT) or off (SF_AMBISONIC_NONE) encoding.
Chris@40 1316 This command is currently only supported for files with SF_FORMAT_WAVEX format.
Chris@40 1317 </P>
Chris@40 1318 <P>
Chris@40 1319 The Ambisonic WAVEX formats are defined here :
Chris@40 1320 <A HREF="http://dream.cs.bath.ac.uk/researchdev/wave-ex/bformat.html">
Chris@40 1321 http://dream.cs.bath.ac.uk/researchdev/wave-ex/bformat.html</A>.
Chris@40 1322 </P>
Chris@40 1323 <DL>
Chris@40 1324 <DT>Return value: </DT>
Chris@40 1325 <DD>Return the ambisonic value that has just been set or zero if the file
Chris@40 1326 format does not support ambisonic encoding.
Chris@40 1327 </DL>
Chris@40 1328
Chris@40 1329 <!-- ========================================================================= -->
Chris@40 1330 <A NAME="SFC_SET_VBR_ENCODING_QUALITY"></A>
Chris@40 1331 <H2><BR><B>SFC_SET_VBR_ENCODING_QUALITY</B></H2>
Chris@40 1332 <P>
Chris@40 1333 Set the Variable Bit Rate encoding quality.
Chris@40 1334 The encoding quality value should be between 0.0 (lowest quality) and 1.0
Chris@40 1335 (highest quality).
Chris@40 1336 Currenly this command is only implemented for FLAC and Ogg/Vorbis files.
Chris@40 1337 It has no effect on un-compressed file formats.
Chris@40 1338 </P>
Chris@40 1339 <P>
Chris@40 1340 Parameters:
Chris@40 1341 <PRE>
Chris@40 1342 sndfile : A valid SNDFILE* pointer
Chris@40 1343 cmd : SFC_SET_VBR_ENCODING_QUALITY
Chris@40 1344 data : A pointer to a double value
Chris@40 1345 datasize : sizeof (double)
Chris@40 1346 </PRE>
Chris@40 1347 <P>
Chris@40 1348 The command must be sent before any audio data is written to the file.
Chris@40 1349 </P>
Chris@40 1350 <P>
Chris@40 1351 </P>
Chris@40 1352 <DL>
Chris@40 1353 <DT>Return value:</DT>
Chris@40 1354 <dd>SF_TRUE if VBR encoding quality was set.
Chris@40 1355 SF_FALSE otherwise.
Chris@40 1356 </DL>
Chris@40 1357
Chris@40 1358 <!-- ========================================================================= -->
Chris@40 1359 <A NAME="SFC_SET_COMPRESSION_LEVEL"></A>
Chris@40 1360 <H2><BR><B>SFC_SET_COMPRESSION_LEVEL</B></H2>
Chris@40 1361 <P>
Chris@40 1362 Set the compression level.
Chris@40 1363 The compression level should be between 0.0 (minimum compression level) and 1.0
Chris@40 1364 (highest compression level).
Chris@40 1365 Currenly this command is only implemented for FLAC and Ogg/Vorbis files.
Chris@40 1366 It has no effect on un-compressed file formats.
Chris@40 1367 </P>
Chris@40 1368 <P>
Chris@40 1369 Parameters:
Chris@40 1370 <PRE>
Chris@40 1371 sndfile : A valid SNDFILE* pointer
Chris@40 1372 cmd : SFC_SET_COMPRESSION_LEVEL
Chris@40 1373 data : A pointer to a double value
Chris@40 1374 datasize : sizeof (double)
Chris@40 1375 </PRE>
Chris@40 1376 <P>
Chris@40 1377 The command must be sent before any audio data is written to the file.
Chris@40 1378 </P>
Chris@40 1379 <P>
Chris@40 1380 </P>
Chris@40 1381 <DL>
Chris@40 1382 <DT>Return value:</DT>
Chris@40 1383 <dd>SF_TRUE if compression level was set.
Chris@40 1384 SF_FALSE otherwise.
Chris@40 1385 </DL>
Chris@40 1386
Chris@40 1387 <!-- ========================================================================= -->
Chris@40 1388 <A NAME="SFC_RAW_NEEDS_ENDSWAP"></A>
Chris@40 1389 <H2><BR><B>SFC_RAW_NEEDS_ENDSWAP</B></H2>
Chris@40 1390 <P>
Chris@40 1391 Determine if raw data read using
Chris@40 1392 <a href="api.html#raw">
Chris@40 1393 sf_read_raw</a>
Chris@40 1394 needs to be end swapped on the host CPU.
Chris@40 1395 </P>
Chris@40 1396 <P>
Chris@40 1397 For instance, will return SF_TRUE on when reading WAV containing
Chris@40 1398 SF_FORMAT_PCM_16 data on a big endian machine and SF_FALSE on a little endian
Chris@40 1399 machine.
Chris@40 1400 </P>
Chris@40 1401 <P>
Chris@40 1402 Parameters:
Chris@40 1403 <PRE>
Chris@40 1404 sndfile : A valid SNDFILE* pointer
Chris@40 1405 cmd : SFC_RAW_NEEDS_ENDSWAP
Chris@40 1406 data : NULL
Chris@40 1407 datasize : 0
Chris@40 1408 </PRE>
Chris@40 1409
Chris@40 1410 <DL>
Chris@40 1411 <DT>Return value: </DT>
Chris@40 1412 <DD>SF_TRUE or SF_FALSE
Chris@40 1413 </DL>
Chris@40 1414
Chris@40 1415
Chris@40 1416 <!-- ========================================================================= -->
Chris@40 1417 <A NAME="SFC_GET_BROADCAST_INFO"></A>
Chris@40 1418 <H2><BR><B>SFC_GET_BROADCAST_INFO</B></H2>
Chris@40 1419 <P>
Chris@40 1420 Retrieve the Broadcast Extension Chunk from WAV (and related) files.
Chris@40 1421 </P>
Chris@40 1422 <p>
Chris@40 1423 Parameters:
Chris@40 1424 </p>
Chris@40 1425 <PRE>
Chris@40 1426 sndfile : A valid SNDFILE* pointer
Chris@40 1427 cmd : SFC_GET_BROADCAST_INFO
Chris@40 1428 data : a pointer to an SF_BROADCAST_INFO struct
Chris@40 1429 datasize : sizeof (SF_BROADCAST_INFO)
Chris@40 1430 </PRE>
Chris@40 1431 <P>
Chris@40 1432 The SF_BROADCAST_INFO struct is defined in &lt;sndfile.h&gt; as:
Chris@40 1433 </P>
Chris@40 1434 <PRE>
Chris@40 1435 typedef struct
Chris@40 1436 { char description [256] ;
Chris@40 1437 char originator [32] ;
Chris@40 1438 char originator_reference [32] ;
Chris@40 1439 char origination_date [10] ;
Chris@40 1440 char origination_time [8] ;
Chris@40 1441 unsigned int time_reference_low ;
Chris@40 1442 unsigned int time_reference_high ;
Chris@40 1443 short version ;
Chris@40 1444 char umid [64] ;
Chris@40 1445 char reserved [190] ;
Chris@40 1446 unsigned int coding_history_size ;
Chris@40 1447 char coding_history [256] ;
Chris@40 1448 } SF_BROADCAST_INFO ;
Chris@40 1449 </PRE>
Chris@40 1450
Chris@40 1451 <DL>
Chris@40 1452 <DT>Return value: </DT>
Chris@40 1453 <DD>SF_TRUE if the file contained a Broadcast Extension chunk or SF_FALSE
Chris@40 1454 otherwise.
Chris@40 1455 </DL>
Chris@40 1456
Chris@40 1457 <!-- ========================================================================= -->
Chris@40 1458 <A NAME="SFC_SET_BROADCAST_INFO"></A>
Chris@40 1459 <H2><BR><B>SFC_SET_BROADCAST_INFO</B></H2>
Chris@40 1460 <P>
Chris@40 1461 Set the Broadcast Extension Chunk for WAV (and related) files.
Chris@40 1462 </P>
Chris@40 1463 <p>
Chris@40 1464 Parameters:
Chris@40 1465 </p>
Chris@40 1466 <PRE>
Chris@40 1467 sndfile : A valid SNDFILE* pointer
Chris@40 1468 cmd : SFC_SET_BROADCAST_INFO
Chris@40 1469 data : a pointer to an SF_BROADCAST_INFO struct
Chris@40 1470 datasize : sizeof (SF_BROADCAST_INFO)
Chris@40 1471 </PRE>
Chris@40 1472
Chris@40 1473 <DL>
Chris@40 1474 <DT>Return value: </DT>
Chris@40 1475 <DD>SF_TRUE if setting the Broadcast Extension chunk was successful and SF_FALSE
Chris@40 1476 otherwise.
Chris@40 1477
Chris@40 1478 </DL>
Chris@40 1479
Chris@40 1480 <!-- ========================================================================= -->
Chris@40 1481 <A NAME="SFC_GET_CART_INFO"></A>
Chris@40 1482 <H2><BR><B>SFC_GET_CART_INFO</B></H2>
Chris@40 1483 <P>Retrieve the Cart Chunk from WAV (and related) files. Based on AES46 standard for CartChunk (see <a href="http://www.cartchunk.org/">CartChunk.org</a> for more information.
Chris@40 1484 </P>
Chris@40 1485 <p>
Chris@40 1486 Parameters:
Chris@40 1487 </p>
Chris@40 1488 <PRE>
Chris@40 1489 sndfile : A valid SNDFILE* pointer
Chris@40 1490 cmd : SFC_GET_CART_INFO
Chris@40 1491 data : a pointer to an SF_CART_INFO struct
Chris@40 1492 datasize : sizeof (SF_CART_INFO)
Chris@40 1493 </PRE>
Chris@40 1494 <P>
Chris@40 1495 The SF_CART_INFO struct is defined in &lt;sndfile.h&gt; as:
Chris@40 1496 </P>
Chris@40 1497 <PRE>
Chris@40 1498 #define SF_CART_INFO_VAR(p_tag_text_size) \
Chris@40 1499 struct
Chris@40 1500 { char version [4] ;
Chris@40 1501 char title [64] ;
Chris@40 1502 char artist [64] ;
Chris@40 1503 char cut_id [64] ;
Chris@40 1504 char client_id [64] ;
Chris@40 1505 char category [64] ;
Chris@40 1506 char classification [64] ;
Chris@40 1507 char out_cue [64] ;
Chris@40 1508 char start_date [10] ;
Chris@40 1509 char start_time [8] ;
Chris@40 1510 char end_date [10] ;
Chris@40 1511 char end_time [8] ;
Chris@40 1512 char producer_app_id [64] ;
Chris@40 1513 char producer_app_version [64] ;
Chris@40 1514 char user_def [64] ;
Chris@40 1515 long level_reference ;
Chris@40 1516 SF_CART_TIMER post_timers [8] ;
Chris@40 1517 char reserved [276] ;
Chris@40 1518 char url [1024] ;
Chris@40 1519 unsigned int tag_text_size ;
Chris@40 1520 char tag_text[p_tag_text_size] ;
Chris@40 1521 }
Chris@40 1522 </PRE>
Chris@40 1523
Chris@40 1524 <DL>
Chris@40 1525 <DT>Return value: </DT>
Chris@40 1526 <DD>SF_TRUE if the file contained a Cart chunk or SF_FALSE
Chris@40 1527 otherwise.
Chris@40 1528 </DL>
Chris@40 1529
Chris@40 1530 <!-- ========================================================================= -->
Chris@40 1531 <A NAME="SFC_SET_CART_INFO"></A>
Chris@40 1532 <H2><BR><B>SFC_SET_CART_INFO</B></H2>
Chris@40 1533 <P>
Chris@40 1534 Set the Cart Chunk for WAV (and related) files.
Chris@40 1535 </P>
Chris@40 1536 <p>
Chris@40 1537 Parameters:
Chris@40 1538 </p>
Chris@40 1539 <PRE>
Chris@40 1540 sndfile : A valid SNDFILE* pointer
Chris@40 1541 cmd : SFC_SET_CART_INFO
Chris@40 1542 data : a pointer to an SF_CART_INFO struct
Chris@40 1543 datasize : sizeof (SF_CART_INFO)
Chris@40 1544 </PRE>
Chris@40 1545
Chris@40 1546 <DL>
Chris@40 1547 <DT>Return value: </DT>
Chris@40 1548 <DD>SF_TRUE if setting the Cart chunk was successful and SF_FALSE
Chris@40 1549 otherwise.
Chris@40 1550 </DL>
Chris@40 1551 <!-- ========================================================================= -->
Chris@40 1552
Chris@40 1553 <A NAME="SFC_GET_LOOP_INFO"></A>
Chris@40 1554 <H2><BR><B>SFC_GET_LOOP_INFO</B></H2>
Chris@40 1555 <P>
Chris@40 1556 Retrieve loop information for file including time signature, length in
Chris@40 1557 beats and original MIDI base note
Chris@40 1558 </P>
Chris@40 1559 <p>
Chris@40 1560 Parameters:
Chris@40 1561 </p>
Chris@40 1562 <PRE>
Chris@40 1563 sndfile : A valid SNDFILE* pointer
Chris@40 1564 cmd : SFC_GET_LOOP_INFO
Chris@40 1565 data : a pointer to an SF_LOOP_INFO struct
Chris@40 1566 datasize : sizeof (SF_LOOP_INFO)
Chris@40 1567 </PRE>
Chris@40 1568 <P>
Chris@40 1569 The SF_BROADCAST_INFO struct is defined in &lt;sndfile.h&gt; as:
Chris@40 1570 </P>
Chris@40 1571 <PRE>
Chris@40 1572 typedef struct
Chris@40 1573 { short time_sig_num ; /* any positive integer > 0 */
Chris@40 1574 short time_sig_den ; /* any positive power of 2 > 0 */
Chris@40 1575 int loop_mode ; /* see SF_LOOP enum */
Chris@40 1576
Chris@40 1577 int num_beats ; /* this is NOT the amount of quarter notes !!!*/
Chris@40 1578 /* a full bar of 4/4 is 4 beats */
Chris@40 1579 /* a full bar of 7/8 is 7 beats */
Chris@40 1580
Chris@40 1581 float bpm ; /* suggestion, as it can be calculated using other fields:*/
Chris@40 1582 /* file's lenght, file's sampleRate and our time_sig_den*/
Chris@40 1583 /* -> bpms are always the amount of _quarter notes_ per minute */
Chris@40 1584
Chris@40 1585 int root_key ; /* MIDI note, or -1 for None */
Chris@40 1586 int future [6] ;
Chris@40 1587 } SF_LOOP_INFO ;
Chris@40 1588 </PRE>
Chris@40 1589 <P>
Chris@40 1590 Example:
Chris@40 1591 </P>
Chris@40 1592 <PRE>
Chris@40 1593 SF_LOOP_INFO loop;
Chris@40 1594 sf_command (sndfile, SFC_GET_LOOP_INFO, &amp;loop, sizeof (loop)) ;
Chris@40 1595 </PRE>
Chris@40 1596 <DL>
Chris@40 1597 <DT>Return value:</DT>
Chris@40 1598 <DD>SF_TRUE if the file header contains loop information for the file.
Chris@40 1599 SF_FALSE otherwise.
Chris@40 1600 </DL>
Chris@40 1601
Chris@40 1602 <!-- ========================================================================= -->
Chris@40 1603
Chris@40 1604
Chris@40 1605 <A NAME="SFC_GET_INSTRUMENT"></A>
Chris@40 1606 <H2><BR><B>SFC_GET_INSTRUMENT</B></H2>
Chris@40 1607 <P>
Chris@40 1608 Retrieve instrument information from file including MIDI base note,
Chris@40 1609 keyboard mapping and looping informations(start/stop and mode).
Chris@40 1610 </P>
Chris@40 1611 <p>
Chris@40 1612 Parameters:
Chris@40 1613 </p>
Chris@40 1614 <PRE>
Chris@40 1615 sndfile : A valid SNDFILE* pointer
Chris@40 1616 cmd : SFC_GET_INSTRUMENT
Chris@40 1617 data : a pointer to an SF_INSTRUMENT struct
Chris@40 1618 datasize : sizeof (SF_INSTRUMENT)
Chris@40 1619 </PRE>
Chris@40 1620
Chris@40 1621 <P>
Chris@40 1622 The SF_INSTRUMENT struct is defined in &lt;sndfile.h&gt; as:
Chris@40 1623 </P>
Chris@40 1624 <PRE>
Chris@40 1625 enum
Chris@40 1626 { /*
Chris@40 1627 ** The loop mode field in SF_INSTRUMENT will be one of the following.
Chris@40 1628 */
Chris@40 1629 SF_LOOP_NONE = 800,
Chris@40 1630 SF_LOOP_FORWARD,
Chris@40 1631 SF_LOOP_BACKWARD,
Chris@40 1632 SF_LOOP_ALTERNATING
Chris@40 1633 } ;
Chris@40 1634
Chris@40 1635 typedef struct
Chris@40 1636 { int gain ;
Chris@40 1637 char basenote, detune ;
Chris@40 1638 char velocity_lo, velocity_hi ;
Chris@40 1639 char key_lo, key_hi ;
Chris@40 1640 int loop_count ;
Chris@40 1641
Chris@40 1642 struct
Chris@40 1643 { int mode ;
Chris@40 1644 unsigned int start ;
Chris@40 1645 unsigned int end ;
Chris@40 1646 unsigned int count ;
Chris@40 1647 } loops [16] ; /* make variable in a sensible way */
Chris@40 1648 } SF_INSTRUMENT ;
Chris@40 1649 </PRE>
Chris@40 1650
Chris@40 1651 <P>
Chris@40 1652 Example:
Chris@40 1653 </P>
Chris@40 1654 <PRE>
Chris@40 1655 SF_INSTRUMENT inst ;
Chris@40 1656 sf_command (sndfile, SFC_GET_INSTRUMENT, &amp;inst, sizeof (inst)) ;
Chris@40 1657 </PRE>
Chris@40 1658 <DL>
Chris@40 1659 <DT>Return value:</DT>
Chris@40 1660 <dd>SF_TRUE if the file header contains instrument information for the
Chris@40 1661 file. SF_FALSE otherwise.
Chris@40 1662 </DL>
Chris@40 1663
Chris@40 1664 <!-- ========================================================================= -->
Chris@40 1665
Chris@40 1666
Chris@40 1667 <A NAME="SFC_SET_INSTRUMENT"></A>
Chris@40 1668 <H2><BR><B>SFC_SET_INSTRUMENT</B></H2>
Chris@40 1669 <P>
Chris@40 1670 Set the instrument information for the file.
Chris@40 1671 </P>
Chris@40 1672 <p>
Chris@40 1673 Parameters:
Chris@40 1674 </p>
Chris@40 1675 <PRE>
Chris@40 1676 sndfile : A valid SNDFILE* pointer
Chris@40 1677 cmd : SFC_SET_INSTRUMENT
Chris@40 1678 data : a pointer to an SF_INSTRUMENT struct
Chris@40 1679 datasize : sizeof (SF_INSTRUMENT)
Chris@40 1680 </PRE>
Chris@40 1681 <P>
Chris@40 1682 Example:
Chris@40 1683 </P>
Chris@40 1684 <PRE>
Chris@40 1685 SF_INSTRUMENT inst ;
Chris@40 1686 sf_command (sndfile, SFC_SET_INSTRUMENT, &amp;inst, sizeof (inst)) ;
Chris@40 1687 </PRE>
Chris@40 1688 <DL>
Chris@40 1689 <DT>Return value:</DT>
Chris@40 1690 <dd>SF_TRUE if the file header contains instrument information for the
Chris@40 1691 file. SF_FALSE otherwise.
Chris@40 1692 </DL>
Chris@40 1693
Chris@40 1694
Chris@40 1695 <!-- ========================================================================= -->
Chris@40 1696
Chris@40 1697 <A NAME="SFC_GET_CUE"></A>
Chris@40 1698 <H2><BR><B>SFC_GET_CUE_COUNT</B></H2>
Chris@40 1699 <P>
Chris@40 1700 Retrieve the number of cue markers available for retrieval using the
Chris@40 1701 SFC_GET_CUE command.
Chris@40 1702 </P>
Chris@40 1703 <P>
Chris@40 1704 Parameters:
Chris@40 1705 </P>
Chris@40 1706 <PRE>
Chris@40 1707 sndfile : A valid SNDFILE* pointer
Chris@40 1708 cmd : SFC_GET_CUE
Chris@40 1709 data : a pointer to a uint32_t
Chris@40 1710 datasize : sizeof (uint32_t)
Chris@40 1711 </PRE>
Chris@40 1712
Chris@40 1713
Chris@40 1714 <P>
Chris@40 1715 Example:
Chris@40 1716 </P>
Chris@40 1717 <PRE>
Chris@40 1718 uint32_t cue_count ;
Chris@40 1719 sf_command (sndfile, SFC_GET_CUE_COUNT, &amp;cue_count, sizeof (cue_count)) ;
Chris@40 1720 </PRE>
Chris@40 1721 <DL>
Chris@40 1722 <DT>Return value:</DT>
Chris@40 1723 <dd>SF_TRUE if the file header contains cue marker information for the
Chris@40 1724 file. SF_FALSE otherwise.
Chris@40 1725 </DL>
Chris@40 1726
Chris@40 1727 <!-- ========================================================================= -->
Chris@40 1728
Chris@40 1729 <A NAME="SFC_GET_CUE"></A>
Chris@40 1730 <H2><BR><B>SFC_GET_CUE</B></H2>
Chris@40 1731 <P>
Chris@40 1732 Retrieve cue marker information from file.
Chris@40 1733 </P>
Chris@40 1734 <P>
Chris@40 1735 Parameters:
Chris@40 1736 </P>
Chris@40 1737 <PRE>
Chris@40 1738 sndfile : A valid SNDFILE* pointer
Chris@40 1739 cmd : SFC_GET_CUE
Chris@40 1740 data : a pointer to an SF_CUES struct
Chris@40 1741 datasize : sizeof (SF_CUES)
Chris@40 1742 </PRE>
Chris@40 1743
Chris@40 1744 <P>
Chris@40 1745 The SF_CUES struct is defined in &lt;sndfile.h&gt; as:
Chris@40 1746 </P>
Chris@40 1747 <PRE>
Chris@40 1748 typedef struct
Chris@40 1749 { int cue_count ;
Chris@40 1750
Chris@40 1751 struct
Chris@40 1752 { int32_t indx ;
Chris@40 1753 uint32_t position ;
Chris@40 1754 int32_t fcc_chunk ;
Chris@40 1755 int32_t chunk_start ;
Chris@40 1756 int32_t block_start ;
Chris@40 1757 uint32_t sample_offset ;
Chris@40 1758 char name [256] ;
Chris@40 1759 } cue_points [100] ;
Chris@40 1760 } SF_CUES ;
Chris@40 1761 </PRE>
Chris@40 1762
Chris@40 1763 <P>
Chris@40 1764 There is also an SF_CUES_VAR #define that allows reading/writing more than 100
Chris@40 1765 cue markers.
Chris@40 1766 </P>
Chris@40 1767
Chris@40 1768 <P>
Chris@40 1769 Example:
Chris@40 1770 </P>
Chris@40 1771 <PRE>
Chris@40 1772 SF_CUES cues ;
Chris@40 1773 sf_command (sndfile, SFC_GET_CUE, &amp;cues, sizeof (cues)) ;
Chris@40 1774 </PRE>
Chris@40 1775 <DL>
Chris@40 1776 <DT>Return value:</DT>
Chris@40 1777 <dd>SF_TRUE if the file header contains cue marker information for the
Chris@40 1778 file. SF_FALSE otherwise.
Chris@40 1779 </DL>
Chris@40 1780
Chris@40 1781
Chris@40 1782 <!-- ========================================================================= -->
Chris@40 1783
Chris@40 1784
Chris@40 1785 <A NAME="SFC_SET_CUE"></A>
Chris@40 1786 <H2><BR><B>SFC_SET_CUE</B></H2>
Chris@40 1787 <P>
Chris@40 1788 Set the cue marker information for the file.
Chris@40 1789 </P>
Chris@40 1790 <P>
Chris@40 1791 Parameters:
Chris@40 1792 </P>
Chris@40 1793 <PRE>
Chris@40 1794 sndfile : A valid SNDFILE* pointer
Chris@40 1795 cmd : SFC_SET_CUE
Chris@40 1796 data : a pointer to an SF_CUES struct
Chris@40 1797 datasize : sizeof (SF_CUES)
Chris@40 1798 </PRE>
Chris@40 1799 <P>
Chris@40 1800 Example:
Chris@40 1801 </P>
Chris@40 1802 <PRE>
Chris@40 1803 SF_CUES cues ;
Chris@40 1804 sf_command (sndfile, SFC_SET_CUE, &amp;cues, sizeof (cues)) ;
Chris@40 1805 </PRE>
Chris@40 1806 <DL>
Chris@40 1807 <DT>Return value:</DT>
Chris@40 1808 <dd>SF_TRUE if the file header contains cue marker information for the
Chris@40 1809 file. SF_FALSE otherwise.
Chris@40 1810 </DL>
Chris@40 1811
Chris@40 1812
Chris@40 1813 <!-- ========================================================================= -->
Chris@40 1814
Chris@40 1815
Chris@40 1816 <A NAME="SFC_RF64_AUTO_DOWNGRADE"></A>
Chris@40 1817 <H2><BR><B>SFC_RF64_AUTO_DOWNGRADE</B></H2>
Chris@40 1818 <P>
Chris@40 1819 Enable auto downgrade from RF64 to WAV.
Chris@40 1820 </P>
Chris@40 1821 <P>
Chris@40 1822 The EBU recomendation is that when writing RF64 files and the resulting file is
Chris@40 1823 less than 4Gig in size, it should be downgraded to a WAV file (WAV files have a
Chris@40 1824 maximum size of 4Gig).
Chris@40 1825 libsndfile doesn't follow the EBU recommendations exactly, , mainly because the
Chris@40 1826 test suite needs to be able test reading/writing RF64 files without having to
Chris@40 1827 generate files larger than 4 gigabytes.
Chris@40 1828 </P>
Chris@40 1829 <p>
Chris@40 1830 Note: This command should be issued before the first bit of audio data has been
Chris@40 1831 written to the file.
Chris@40 1832 Calling this command after audio data has been written will return the current
Chris@40 1833 value of this setting, but will not allow it to be changed.
Chris@40 1834 </p>
Chris@40 1835 <p>
Chris@40 1836 Parameters:
Chris@40 1837 </p>
Chris@40 1838 <PRE>
Chris@40 1839 sndfile : A valid SNDFILE* pointer
Chris@40 1840 cmd : SFC_RF64_AUTO_DOWNGRADE
Chris@40 1841 data : NULL
Chris@40 1842 datasize : SF_TRUE or SF_FALSE
Chris@40 1843 </PRE>
Chris@40 1844 <P>
Chris@40 1845 Example:
Chris@40 1846 </P>
Chris@40 1847 <PRE>
Chris@40 1848 /* Enable auto downgrade on file close. */
Chris@40 1849 sf_command (sndfile, SFC_RF64_AUTO_DOWNGRADE, NULL, SF_TRUE) ;
Chris@40 1850 </PRE>
Chris@40 1851 <DL>
Chris@40 1852 <DT>Return value:</DT>
Chris@40 1853 <dd>Returns SF_TRUE if SFC_RF64_AUTO_DOWNGRADE is set and SF_FALSE
Chris@40 1854 otherwise.
Chris@40 1855 </DL>
Chris@40 1856
Chris@40 1857
Chris@40 1858
Chris@40 1859 <!-- ========================================================================= -->
Chris@40 1860
Chris@40 1861
Chris@40 1862 <HR>
Chris@40 1863 <P>
Chris@40 1864 The libsndfile home page is here :
Chris@40 1865 <A HREF="http://www.mega-nerd.com/libsndfile/">
Chris@40 1866 http://www.mega-nerd.com/libsndfile/</A>.
Chris@40 1867 <BR>
Chris@40 1868 Version : 1.0.25
Chris@40 1869 </P>
Chris@40 1870
Chris@40 1871 </BODY>
Chris@40 1872 </HTML>