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annotate src/libsndfile-1.0.25/doc/command.html @ 23:619f715526df sv_v2.1

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Update Vamp plugin SDK to 2.5
author Chris Cannam
date Thu, 09 May 2013 10:52:46 +0100
parents c7265573341e
children
rev   line source
Chris@0 1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
Chris@0 2 <HTML>
Chris@0 3
Chris@0 4 <HEAD>
Chris@0 5 <TITLE>
Chris@0 6 libsndfile : the sf_command function.
Chris@0 7 </TITLE>
Chris@0 8 <META NAME="Author" CONTENT="Erik de Castro Lopo (erikd AT mega-nerd DOT com)">
Chris@0 9 <!-- Another version at the bottom of the page. -->
Chris@0 10 <META NAME="Description" CONTENT="The libsndfile API.">
Chris@0 11 <META NAME="Keywords" CONTENT="WAV AIFF AU libsndfile sound audio dsp Linux">
Chris@0 12 <LINK REL="stylesheet" HREF="libsndfile.css" TYPE="text/css" MEDIA="all">
Chris@0 13 <LINK REL="stylesheet" HREF="print.css" TYPE="text/css" MEDIA="print">
Chris@0 14 </HEAD>
Chris@0 15
Chris@0 16 <BODY>
Chris@0 17
Chris@0 18 <H1><B>sf_command</B></H1>
Chris@0 19 <PRE>
Chris@0 20
Chris@0 21 int sf_command (SNDFILE *sndfile, int cmd, void *data, int datasize) ;
Chris@0 22 </PRE>
Chris@0 23 <P>
Chris@0 24 This function allows the caller to retrieve information from or change aspects of the
Chris@0 25 library behaviour.
Chris@0 26 Examples include retrieving a string containing the library version or changing the
Chris@0 27 scaling applied to floating point sample data during read and write.
Chris@0 28 Most of these operations are performed on a per-file basis.
Chris@0 29 </P>
Chris@0 30 <P>
Chris@0 31 The cmd parameter is an integer identifier which is defined in &lt;sndfile.h&gt;.
Chris@0 32 All of the valid command identifiers have names beginning with "SFC_".
Chris@0 33 Data is passed to and returned from the library by use of a void pointer.
Chris@0 34 The library will not read or write more than datasize bytes from the void pointer.
Chris@0 35 For some calls no data is required in which case data should be NULL and datasize
Chris@0 36 may be used for some other purpose.
Chris@0 37 </P>
Chris@0 38 <P>
Chris@0 39 The available commands are as follows:
Chris@0 40 </P>
Chris@0 41
Chris@0 42 <CENTER>
Chris@0 43 <TABLE BORDER="0" WIDTH="90%" CELLPADDING="4">
Chris@0 44 <TR>
Chris@0 45 <TD><A HREF="#SFC_GET_LIB_VERSION">SFC_GET_LIB_VERSION</A></TD>
Chris@0 46 <TD>Retrieve the version of the library.</TD>
Chris@0 47 </TR>
Chris@0 48 <TR>
Chris@0 49 <TD><A HREF="#SFC_GET_LOG_INFO">SFC_GET_LOG_INFO</A></TD>
Chris@0 50 <TD>Retrieve the internal per-file operation log.</TD>
Chris@0 51 </TR>
Chris@0 52 <TR>
Chris@0 53 <TD><A HREF="#SFC_CALC_SIGNAL_MAX">SFC_CALC_SIGNAL_MAX</A></TD>
Chris@0 54 <TD>Calculate the measured maximum signal value.</TD>
Chris@0 55 </TR>
Chris@0 56 <TR>
Chris@0 57 <TD><A HREF="#SFC_CALC_NORM_SIGNAL_MAX">SFC_CALC_NORM_SIGNAL_MAX</A></TD>
Chris@0 58 <TD>Calculate the measured normalised maximum signal value.</TD>
Chris@0 59 </TR>
Chris@0 60 <TR>
Chris@0 61 <TD><A HREF="#SFC_CALC_MAX_ALL_CHANNELS">SFC_CALC_MAX_ALL_CHANNELS</A></TD>
Chris@0 62 <TD>Calculate the peak value for each channel.</TD>
Chris@0 63 </TR>
Chris@0 64 <TR>
Chris@0 65 <TD><A HREF="#SFC_CALC_NORM_MAX_ALL_CHANNELS">SFC_CALC_NORM_MAX_ALL_CHANNELS</A></TD>
Chris@0 66 <TD>Calculate the normalised peak for each channel.</TD>
Chris@0 67 </TR>
Chris@0 68
Chris@0 69 <TR>
Chris@0 70 <TD><A HREF="#SFC_GET_SIGNAL_MAX">SFC_GET_SIGNAL_MAX</A></TD>
Chris@0 71 <TD>Retrieve the peak value for the file (as stored in the file header).</TD>
Chris@0 72 </TR>
Chris@0 73 <TR>
Chris@0 74 <TD><A HREF="#SFC_GET_MAX_ALL_CHANNELS">SFC_GET_MAX_ALL_CHANNELS</A></TD>
Chris@0 75 <TD>Retrieve the peak value for each channel (as stored in the file header).</TD>
Chris@0 76 </TR>
Chris@0 77
Chris@0 78 <TR>
Chris@0 79 <TD><A HREF="#SFC_SET_NORM_FLOAT">SFC_SET_NORM_FLOAT</A></TD>
Chris@0 80 <TD>Modify the normalisation behaviour of the floating point reading and writing functions.</TD>
Chris@0 81 </TR>
Chris@0 82 <TR>
Chris@0 83 <TD><A HREF="#SFC_SET_NORM_DOUBLE">SFC_SET_NORM_DOUBLE</A></TD>
Chris@0 84 <TD>Modify the normalisation behaviour of the double precision floating point reading and writing functions.</TD>
Chris@0 85 </TR>
Chris@0 86 <TR>
Chris@0 87 <TD><A HREF="#SFC_GET_NORM_FLOAT">SFC_GET_NORM_FLOAT</A></TD>
Chris@0 88 <TD>Retrieve the current normalisation behaviour of the floating point reading and writing functions.</TD>
Chris@0 89 </TR>
Chris@0 90 <TR>
Chris@0 91 <TD><A HREF="#SFC_GET_NORM_DOUBLE">SFC_GET_NORM_DOUBLE</A></TD>
Chris@0 92 <TD>Retrieve the current normalisation behaviour of the double precision floating point reading and writing functions.</TD>
Chris@0 93 </TR>
Chris@0 94 <TR>
Chris@0 95 <TD><A HREF="#SFC_SET_SCALE_FLOAT_INT_READ">SFC_SET_SCALE_FLOAT_INT_READ</A></TD>
Chris@0 96 <TD>Set/clear the scale factor when integer (short/int) data is read from a file
Chris@0 97 containing floating point data.</TD>
Chris@0 98 </TR>
Chris@0 99
Chris@0 100 <TR>
Chris@0 101 <TD><A HREF="#SFC_SET_SCALE_INT_FLOAT_WRITE">SFC_SET_SCALE_INT_FLOAT_WRITE</A></TD>
Chris@0 102 <TD>Set/clear the scale factor when integer (short/int) data is written to a file
Chris@0 103 as floating point data.</TD>
Chris@0 104 </TR>
Chris@0 105
Chris@0 106 <TR>
Chris@0 107 <TD><A HREF="#SFC_GET_SIMPLE_FORMAT_COUNT">SFC_GET_SIMPLE_FORMAT_COUNT</A></TD>
Chris@0 108 <TD>Retrieve the number of simple formats supported by libsndfile.</TD>
Chris@0 109 </TR>
Chris@0 110 <TR>
Chris@0 111 <TD><A HREF="#SFC_GET_SIMPLE_FORMAT">SFC_GET_SIMPLE_FORMAT</A></TD>
Chris@0 112 <TD>Retrieve information about a simple format.</TD>
Chris@0 113 </TR>
Chris@0 114
Chris@0 115 <TR>
Chris@0 116 <TD><A HREF="#SFC_GET_FORMAT_INFO">SFC_GET_FORMAT_INFO</A></TD>
Chris@0 117 <TD>Retrieve information about a major or subtype format.</TD>
Chris@0 118 </TR>
Chris@0 119
Chris@0 120 <TR>
Chris@0 121 <TD><A HREF="#SFC_GET_FORMAT_MAJOR_COUNT">SFC_GET_FORMAT_MAJOR_COUNT</A></TD>
Chris@0 122 <TD>Retrieve the number of major formats.</TD>
Chris@0 123 </TR>
Chris@0 124 <TR>
Chris@0 125 <TD><A HREF="#SFC_GET_FORMAT_MAJOR">SFC_GET_FORMAT_MAJOR</A></TD>
Chris@0 126 <TD>Retrieve information about a major format type.</TD>
Chris@0 127 </TR>
Chris@0 128 <TR>
Chris@0 129 <TD><A HREF="#SFC_GET_FORMAT_SUBTYPE_COUNT">SFC_GET_FORMAT_SUBTYPE_COUNT</A></TD>
Chris@0 130 <TD>Retrieve the number of subformats.</TD>
Chris@0 131 </TR>
Chris@0 132 <TR>
Chris@0 133 <TD><A HREF="#SFC_GET_FORMAT_SUBTYPE">SFC_GET_FORMAT_SUBTYPE</A></TD>
Chris@0 134 <TD>Retrieve information about a subformat.</TD>
Chris@0 135 </TR>
Chris@0 136
Chris@0 137 <TR>
Chris@0 138 <TD><A HREF="#SFC_SET_ADD_PEAK_CHUNK">SFC_SET_ADD_PEAK_CHUNK</A></TD>
Chris@0 139 <TD>Switch the code for adding the PEAK chunk to WAV and AIFF files on or off.</TD>
Chris@0 140 </TR>
Chris@0 141
Chris@0 142 <TR>
Chris@0 143 <TD><A HREF="#SFC_UPDATE_HEADER_NOW">SFC_UPDATE_HEADER_NOW</A></TD>
Chris@0 144 <TD>Used when a file is open for write, this command will update the file
Chris@0 145 header to reflect the data written so far.</TD>
Chris@0 146 </TR>
Chris@0 147 <TR>
Chris@0 148 <TD><A HREF="#SFC_SET_UPDATE_HEADER_AUTO">SFC_SET_UPDATE_HEADER_AUTO</A></TD>
Chris@0 149 <TD>Used when a file is open for write, this command will cause the file header
Chris@0 150 to be updated after each write to the file.</TD>
Chris@0 151 </TR>
Chris@0 152
Chris@0 153 <TR>
Chris@0 154 <TD><A HREF="#SFC_FILE_TRUNCATE">SFC_FILE_TRUNCATE</A></TD>
Chris@0 155 <TD>Truncate a file open for write or for read/write.</TD>
Chris@0 156 </TR>
Chris@0 157
Chris@0 158 <TR>
Chris@0 159 <TD><A HREF="#SFC_SET_RAW_START_OFFSET">SFC_SET_RAW_START_OFFSET</A></TD>
Chris@0 160 <TD>Change the data start offset for files opened up as SF_FORMAT_RAW.</TD>
Chris@0 161 </TR>
Chris@0 162
Chris@0 163 <TR>
Chris@0 164 <TD><A HREF="#SFC_SET_CLIPPING">SFC_SET_CLIPPING</A></TD>
Chris@0 165 <TD>Turn on/off automatic clipping when doing floating point to integer
Chris@0 166 conversion.</TD>
Chris@0 167 </TR>
Chris@0 168
Chris@0 169 <TR>
Chris@0 170 <TD><A HREF="#SFC_GET_CLIPPING">SFC_GET_CLIPPING</A></TD>
Chris@0 171 <TD>Retrieve current clipping setting.</TD>
Chris@0 172 </TR>
Chris@0 173
Chris@0 174 <TR>
Chris@0 175 <TD><A HREF="#SFC_GET_EMBED_FILE_INFO">SFC_GET_EMBED_FILE_INFO</A></TD>
Chris@0 176 <TD>Retrieve information about audio files embedded inside other files.</TD>
Chris@0 177 </TR>
Chris@0 178
Chris@0 179 <TR>
Chris@0 180 <TD><A HREF="#SFC_WAVEX_GET_AMBISONIC">SFC_GET_AMBISONIC</A></TD>
Chris@0 181 <TD>Test a WAVEX file for Ambisonic format</TD>
Chris@0 182 </TR>
Chris@0 183
Chris@0 184 <TR>
Chris@0 185 <TD><A HREF="#SFC_WAVEX_SET_AMBISONIC">SFC_SET_AMBISONIC</A></TD>
Chris@0 186 <TD>Modify a WAVEX header for Ambisonic format</TD>
Chris@0 187 </TR>
Chris@0 188
Chris@0 189 <TR>
Chris@0 190 <TD><A HREF="#SFC_SET_VBR_ENCODING_QUALITY">SFC_SET_VBR_ENCODING_QUALITY</A></TD>
Chris@0 191 <TD>Set the the Variable Bit Rate encoding quality</TD>
Chris@0 192 </TR>
Chris@0 193
Chris@0 194 <TR>
Chris@0 195 <TD><A HREF="#SFC_RAW_NEEDS_ENDSWAP">SFC_RAW_NEEDS_ENDSWAP</a></td>
Chris@0 196 <TD>Determine if raw data needs endswapping</TD>
Chris@0 197 </TR>
Chris@0 198
Chris@0 199 <TR>
Chris@0 200 <TD><A HREF="#SFC_GET_BROADCAST_INFO">SFC_GET_BROADCAST_INFO</A></TD>
Chris@0 201 <TD>Retrieve the Broadcast Chunk info</TD>
Chris@0 202 </TR>
Chris@0 203
Chris@0 204 <TR>
Chris@0 205 <TD><A HREF="#SFC_SET_BROADCAST_INFO">SFC_SET_BROADCAST_INFO</A></TD>
Chris@0 206 <TD>Set the Broadcast Chunk info</TD>
Chris@0 207 </TR>
Chris@0 208
Chris@0 209 <TR>
Chris@0 210 <TD><A HREF="#SFC_GET_LOOP_INFO">SFC_GET_LOOP_INFO</A></TD>
Chris@0 211 <TD>Get loop info</TD>
Chris@0 212 </TR>
Chris@0 213
Chris@0 214 <TR>
Chris@0 215 <TD><A HREF="#SFC_GET_INSTRUMENT">SFC_GET_INSTRUMENT</A></TD>
Chris@0 216 <TD>Get instrument info</TD>
Chris@0 217 </TR>
Chris@0 218
Chris@0 219 <TR>
Chris@0 220 <TD><A HREF="#SFC_SET_INSTRUMENT">SFC_SET_INSTRUMENT</A></TD>
Chris@0 221 <TD>Set instrument info</TD>
Chris@0 222 </TR>
Chris@0 223
Chris@0 224 <TR>
Chris@0 225 <TD><A HREF="#SFC_SET_VBR_ENCODING_QUALITY">SFC_SET_VBR_ENCODING_QUALITY</A></TD>
Chris@0 226 <TD>Set variable bit rate encoding quality</TD>
Chris@0 227 </TR>
Chris@0 228
Chris@0 229
Chris@0 230
Chris@0 231 <!--
Chris@0 232 <TR>
Chris@0 233 <TD><A HREF="#add-dither">add dither</A></TD>
Chris@0 234 <TD>Add dither to output on write.</TD>
Chris@0 235 </TR>
Chris@0 236 -->
Chris@0 237 </TABLE>
Chris@0 238 </CENTER>
Chris@0 239
Chris@0 240 <BR><BR>
Chris@0 241
Chris@0 242 <HR>
Chris@0 243
Chris@0 244 <!-- ========================================================================= -->
Chris@0 245 <A NAME="SFC_GET_LIB_VERSION"></A>
Chris@0 246 <H2><BR><B>SFC_GET_LIB_VERSION</B></H2>
Chris@0 247 <P>
Chris@0 248 Retrieve the version of the library as a string.
Chris@0 249 </P>
Chris@0 250 <P>
Chris@0 251 Parameters:
Chris@0 252 <PRE>
Chris@0 253 sndfile : Not used
Chris@0 254 cmd : SFC_GET_LIB_VERSION
Chris@0 255 data : A pointer to a char buffer
Chris@0 256 datasize : The size of the the buffer
Chris@0 257 </PRE>
Chris@0 258 <P>
Chris@0 259 Example:
Chris@0 260 </P>
Chris@0 261 <PRE>
Chris@0 262 char buffer [128] ;
Chris@0 263 sf_command (NULL, SFC_GET_LIB_VERSION, buffer, sizeof (buffer)) ;
Chris@0 264 </PRE>
Chris@0 265
Chris@0 266 <DL>
Chris@0 267 <DT>Return value:</DT>
Chris@0 268 <DD><DD>This call will return the length of the retrieved version string.
Chris@0 269 </DL>
Chris@0 270 <DL>
Chris@0 271 <DT>Notes:</DT>
Chris@0 272 <DD>
Chris@0 273 The string returned in the buffer passed to this function will not overflow
Chris@0 274 the buffer and will always be null terminated .
Chris@0 275 </DL>
Chris@0 276
Chris@0 277 <!-- ========================================================================= -->
Chris@0 278 <A NAME="SFC_GET_LOG_INFO"></A>
Chris@0 279 <H2><BR><B>SFC_GET_LOG_INFO</B></H2>
Chris@0 280 <P>
Chris@0 281 Retrieve the log buffer generated when opening a file as a string. This log
Chris@0 282 buffer can often contain a good reason for why libsndfile failed to open a
Chris@0 283 particular file.
Chris@0 284 </P>
Chris@0 285 <P>
Chris@0 286 Parameters:
Chris@0 287 <PRE>
Chris@0 288 sndfile : A valid SNDFILE* pointer
Chris@0 289 cmd : SFC_GET_LOG_INFO
Chris@0 290 data : A pointer to a char buffer
Chris@0 291 datasize : The size of the the buffer
Chris@0 292 </PRE>
Chris@0 293 <P>
Chris@0 294 Example:
Chris@0 295 </P>
Chris@0 296 <PRE>
Chris@0 297 char buffer [2048] ;
Chris@0 298 sf_command (sndfile, SFC_GET_LOG_INFO, buffer, sizeof (buffer)) ;
Chris@0 299 </PRE>
Chris@0 300
Chris@0 301 <DL>
Chris@0 302 <DT>Return value:</DT>
Chris@0 303 <DD><DD>This call will return the length of the retrieved version string.
Chris@0 304 </DL>
Chris@0 305 <DL>
Chris@0 306 <DT>Notes:</DT>
Chris@0 307 <DD>
Chris@0 308 The string returned in the buffer passed to this function will not overflow
Chris@0 309 the buffer and will always be null terminated .
Chris@0 310 </DL>
Chris@0 311
Chris@0 312 <!-- ========================================================================= -->
Chris@0 313 <A NAME="SFC_CALC_SIGNAL_MAX"></A>
Chris@0 314 <H2><BR><B>SFC_CALC_SIGNAL_MAX</B></H2>
Chris@0 315 <P>
Chris@0 316 Retrieve the measured maximum signal value. This involves reading through
Chris@0 317 the whole file which can be slow on large files.
Chris@0 318 </P>
Chris@0 319 <P>
Chris@0 320 Parameters:
Chris@0 321 <PRE>
Chris@0 322 sndfile : A valid SNDFILE* pointer
Chris@0 323 cmd : SFC_CALC_SIGNAL_MAX
Chris@0 324 data : A pointer to a double
Chris@0 325 datasize : sizeof (double)
Chris@0 326 </PRE>
Chris@0 327 <P>
Chris@0 328 Example:
Chris@0 329 </P>
Chris@0 330 <PRE>
Chris@0 331 double max_val ;
Chris@0 332 sf_command (sndfile, SFC_CALC_SIGNAL_MAX, &amp;max_val, sizeof (max_val)) ;
Chris@0 333 </PRE>
Chris@0 334
Chris@0 335 <DL>
Chris@0 336 <DT>Return value:</DT>
Chris@0 337 <DD><DD>Zero on success, non-zero otherwise.
Chris@0 338 </DL>
Chris@0 339
Chris@0 340 <!-- ========================================================================= -->
Chris@0 341 <A NAME="SFC_CALC_NORM_SIGNAL_MAX"></A>
Chris@0 342 <H2><BR><B>SFC_CALC_NORM_SIGNAL_MAX</B></H2>
Chris@0 343 <P>
Chris@0 344 Retrieve the measured normalised maximum signal value. This involves reading
Chris@0 345 through the whole file which can be slow on large files.
Chris@0 346 </P>
Chris@0 347 <P>
Chris@0 348 Parameters:
Chris@0 349 <PRE>
Chris@0 350 sndfile : A valid SNDFILE* pointer
Chris@0 351 cmd : SFC_CALC_NORM_SIGNAL_MAX
Chris@0 352 data : A pointer to a double
Chris@0 353 datasize : sizeof (double)
Chris@0 354 </PRE>
Chris@0 355 <P>
Chris@0 356 Example:
Chris@0 357 </P>
Chris@0 358 <PRE>
Chris@0 359 double max_val ;
Chris@0 360 sf_command (sndfile, SFC_CALC_NORM_SIGNAL_MAX, &amp;max_val, sizeof (max_val)) ;
Chris@0 361 </PRE>
Chris@0 362
Chris@0 363 <DL>
Chris@0 364 <DT>Return value:</DT>
Chris@0 365 <DD><DD>Zero on success, non-zero otherwise.
Chris@0 366 </DL>
Chris@0 367
Chris@0 368 <!-- ========================================================================= -->
Chris@0 369 <A NAME="SFC_CALC_MAX_ALL_CHANNELS"></A>
Chris@0 370 <H2><BR><B>SFC_CALC_MAX_ALL_CHANNELS</B></H2>
Chris@0 371 <P>
Chris@0 372 Calculate the peak value (ie a single number) for each channel.
Chris@0 373 This involves reading through the whole file which can be slow on large files.
Chris@0 374 </P>
Chris@0 375 <P>
Chris@0 376 Parameters:
Chris@0 377 <PRE>
Chris@0 378 sndfile : A valid SNDFILE* pointer
Chris@0 379 cmd : SFC_CALC_MAX_ALL_CHANNELS
Chris@0 380 data : A pointer to a double
Chris@0 381 datasize : sizeof (double) * number_of_channels
Chris@0 382 </PRE>
Chris@0 383 <P>
Chris@0 384 Example:
Chris@0 385 </P>
Chris@0 386 <PRE>
Chris@0 387 double peaks [number_of_channels] ;
Chris@0 388 sf_command (sndfile, SFC_CALC_MAX_ALL_CHANNELS, peaks, sizeof (peaks)) ;
Chris@0 389 </PRE>
Chris@0 390 <DL>
Chris@0 391 <DT>Return value:</DT>
Chris@0 392 <DD>Zero if peaks have been calculated successfully and non-zero otherwise.
Chris@0 393 </DL>
Chris@0 394
Chris@0 395
Chris@0 396 <!-- ========================================================================= -->
Chris@0 397 <A NAME="SFC_CALC_NORM_MAX_ALL_CHANNELS"></A>
Chris@0 398 <H2><BR><B>SFC_CALC_NORM_MAX_ALL_CHANNELS</B></H2>
Chris@0 399 <P>
Chris@0 400 Calculate the normalised peak for each channel.
Chris@0 401 This involves reading through the whole file which can be slow on large files.
Chris@0 402 </P>
Chris@0 403 <P>
Chris@0 404 Parameters:
Chris@0 405 <PRE>
Chris@0 406 sndfile : A valid SNDFILE* pointer
Chris@0 407 cmd : SFC_CALC_NORM_MAX_ALL_CHANNELS
Chris@0 408 data : A pointer to a double
Chris@0 409 datasize : sizeof (double) * number_of_channels
Chris@0 410 </PRE>
Chris@0 411 <P>
Chris@0 412 Example:
Chris@0 413 </P>
Chris@0 414 <PRE>
Chris@0 415 double peaks [number_of_channels] ;
Chris@0 416 sf_command (sndfile, SFC_CALC_NORM_MAX_ALL_CHANNELS, peaks, sizeof (peaks)) ;
Chris@0 417 </PRE>
Chris@0 418 <DL>
Chris@0 419 <DT>Return value:</DT>
Chris@0 420 <DD>Zero if peaks have been calculated successfully and non-zero otherwise.
Chris@0 421 </DL>
Chris@0 422
Chris@0 423
Chris@0 424
Chris@0 425
Chris@0 426 <!-- ========================================================================= -->
Chris@0 427 <A NAME="SFC_GET_SIGNAL_MAX"></A>
Chris@0 428 <H2><BR><B>SFC_GET_SIGNAL_MAX</B></H2>
Chris@0 429 <P>
Chris@0 430 Retrieve the peak value for the file as stored in the file header.
Chris@0 431 </P>
Chris@0 432 <P>
Chris@0 433 Parameters:
Chris@0 434 <PRE>
Chris@0 435 sndfile : A valid SNDFILE* pointer
Chris@0 436 cmd : SFC_GET_SIGNAL_MAX
Chris@0 437 data : A pointer to a double
Chris@0 438 datasize : sizeof (double)
Chris@0 439 </PRE>
Chris@0 440 <P>
Chris@0 441 Example:
Chris@0 442 </P>
Chris@0 443 <PRE>
Chris@0 444 double max_peak ;
Chris@0 445 sf_command (sndfile, SFC_GET_SIGNAL_MAX, &amp;max_peak, sizeof (max_peak)) ;
Chris@0 446 </PRE>
Chris@0 447 <DL>
Chris@0 448 <DT>Return value:</DT>
Chris@0 449 <DD>SF_TRUE if the file header contained the peak value. SF_FALSE otherwise.
Chris@0 450 </DL>
Chris@0 451
Chris@0 452 <!-- ========================================================================= -->
Chris@0 453 <A NAME="SFC_GET_MAX_ALL_CHANNELS"></A>
Chris@0 454 <H2><BR><B>SFC_GET_MAX_ALL_CHANNELS</B></H2>
Chris@0 455 <P>
Chris@0 456 Retrieve the peak value for the file as stored in the file header.
Chris@0 457 </P>
Chris@0 458 <P>
Chris@0 459 Parameters:
Chris@0 460 <PRE>
Chris@0 461 sndfile : A valid SNDFILE* pointer
Chris@0 462 cmd : SFC_GET_SIGNAL_MAX
Chris@0 463 data : A pointer to an array of doubles
Chris@0 464 datasize : sizeof (double) * number_of_channels
Chris@0 465 </PRE>
Chris@0 466 <P>
Chris@0 467 Example:
Chris@0 468 </P>
Chris@0 469 <PRE>
Chris@0 470 double peaks [number_of_channels] ;
Chris@0 471 sf_command (sndfile, SFC_GET_MAX_ALL_CHANNELS, peaks, sizeof (peaks)) ;
Chris@0 472 </PRE>
Chris@0 473 <DL>
Chris@0 474 <DT>Return value:</DT>
Chris@0 475 <DD>SF_TRUE if the file header contains per channel peak values for the file.
Chris@0 476 SF_FALSE otherwise.
Chris@0 477 </DL>
Chris@0 478
Chris@0 479
Chris@0 480 <!-- ========================================================================= -->
Chris@0 481 <A NAME="SFC_SET_NORM_FLOAT"></A>
Chris@0 482 <H2><BR><B>SFC_SET_NORM_FLOAT</B></H2>
Chris@0 483 <P>
Chris@0 484 This command only affects data read from or written to using the floating point functions:
Chris@0 485 </P>
Chris@0 486 <PRE>
Chris@0 487 size_t <A HREF="api.html#read">sf_read_float</A> (SNDFILE *sndfile, float *ptr, size_t items) ;
Chris@0 488 size_t <A HREF="api.html#readf">sf_readf_float</A> (SNDFILE *sndfile, float *ptr, size_t frames) ;
Chris@0 489
Chris@0 490 size_t <A HREF="api.html#write">sf_write_float</A> (SNDFILE *sndfile, float *ptr, size_t items) ;
Chris@0 491 size_t <A HREF="api.html#writef">sf_writef_float</A> (SNDFILE *sndfile, float *ptr, size_t frames) ;
Chris@0 492 </PRE>
Chris@0 493 <P>
Chris@0 494 Parameters:
Chris@0 495 </P>
Chris@0 496 <PRE>
Chris@0 497 sndfile : A valid SNDFILE* pointer
Chris@0 498 cmd : SFC_SET_NORM_FLOAT
Chris@0 499 data : NULL
Chris@0 500 datasize : SF_TRUE or SF_FALSE
Chris@0 501 </PRE>
Chris@0 502 <P>
Chris@0 503 For read operations setting normalisation to SF_TRUE means that the data from all
Chris@0 504 subsequent reads will be be normalised to the range [-1.0, 1.0].
Chris@0 505 </P>
Chris@0 506 <P>
Chris@0 507 For write operations, setting normalisation to SF_TRUE means than all data supplied
Chris@0 508 to the float write functions should be in the range [-1.0, 1.0] and will be scaled
Chris@0 509 for the file format as necessary.
Chris@0 510 </P>
Chris@0 511 <P>
Chris@0 512 For both cases, setting normalisation to SF_FALSE means that no scaling will take place.
Chris@0 513 </P>
Chris@0 514 <P>
Chris@0 515 Example:
Chris@0 516 </P>
Chris@0 517 <PRE>
Chris@0 518 sf_command (sndfile, SFC_SET_NORM_FLOAT, NULL, SF_TRUE) ;
Chris@0 519
Chris@0 520 sf_command (sndfile, SFC_SET_NORM_FLOAT, NULL, SF_FALSE) ;
Chris@0 521 </PRE>
Chris@0 522 <DL>
Chris@0 523 <DT>Return value: </DT>
Chris@0 524 <DD>Returns the previous float normalisation mode.
Chris@0 525 </DL>
Chris@0 526
Chris@0 527 <!-- ========================================================================= -->
Chris@0 528 <A NAME="SFC_SET_NORM_DOUBLE"></A>
Chris@0 529 <H2><BR><B>SFC_SET_NORM_DOUBLE</B></H2>
Chris@0 530 <P>
Chris@0 531 This command only affects data read from or written to using the double precision
Chris@0 532 floating point functions:
Chris@0 533 </P>
Chris@0 534 <PRE>
Chris@0 535 size_t <A HREF="api.html#read">sf_read_double</A> (SNDFILE *sndfile, double *ptr, size_t items) ;
Chris@0 536 size_t <A HREF="api.html#readf">sf_readf_double</A> (SNDFILE *sndfile, double *ptr, size_t frames) ;
Chris@0 537
Chris@0 538 size_t <A HREF="api.html#write">sf_write_double</A> (SNDFILE *sndfile, double *ptr, size_t items) ;
Chris@0 539 size_t <A HREF="api.html#writef">sf_writef_double</A> (SNDFILE *sndfile, double *ptr, size_t frames) ;
Chris@0 540 </PRE>
Chris@0 541 <P>
Chris@0 542 Parameters:
Chris@0 543 </P>
Chris@0 544 <PRE>
Chris@0 545 sndfile : A valid SNDFILE* pointer
Chris@0 546 cmd : SFC_SET_NORM_DOUBLE
Chris@0 547 data : NULL
Chris@0 548 datasize : SF_TRUE or SF_FALSE
Chris@0 549 </PRE>
Chris@0 550 <P>
Chris@0 551 For read operations setting normalisation to SF_TRUE means that the data
Chris@0 552 from all subsequent reads will be be normalised to the range [-1.0, 1.0].
Chris@0 553 </P>
Chris@0 554 <P>
Chris@0 555 For write operations, setting normalisation to SF_TRUE means than all data supplied
Chris@0 556 to the double write functions should be in the range [-1.0, 1.0] and will be scaled
Chris@0 557 for the file format as necessary.
Chris@0 558 </P>
Chris@0 559 <P>
Chris@0 560 For both cases, setting normalisation to SF_FALSE means that no scaling will take place.
Chris@0 561 </P>
Chris@0 562 <P>
Chris@0 563 Example:
Chris@0 564 </P>
Chris@0 565 <PRE>
Chris@0 566 sf_command (sndfile, SFC_SET_NORM_DOUBLE, NULL, SF_TRUE) ;
Chris@0 567
Chris@0 568 sf_command (sndfile, SFC_SET_NORM_DOUBLE, NULL, SF_FALSE) ;
Chris@0 569 </PRE>
Chris@0 570 <DL>
Chris@0 571 <DT>Return value: </DT>
Chris@0 572 <DD>Returns the previous double normalisation mode.
Chris@0 573 </DL>
Chris@0 574
Chris@0 575 <!-- ========================================================================= -->
Chris@0 576 <A NAME="SFC_GET_NORM_FLOAT"></A>
Chris@0 577 <H2><BR><B>SFC_GET_NORM_FLOAT</B></H2>
Chris@0 578 <P>
Chris@0 579 Retrieve the current float normalisation mode.
Chris@0 580 </P>
Chris@0 581 <P>
Chris@0 582 Parameters:
Chris@0 583 </P>
Chris@0 584 <PRE>
Chris@0 585 sndfile : A valid SNDFILE* pointer
Chris@0 586 cmd : SFC_GET_NORM_FLOAT
Chris@0 587 data : NULL
Chris@0 588 datasize : anything
Chris@0 589 </PRE>
Chris@0 590 <P>
Chris@0 591 Example:
Chris@0 592 </P>
Chris@0 593 <PRE>
Chris@0 594 normalisation = sf_command (sndfile, SFC_GET_NORM_FLOAT, NULL, 0) ;
Chris@0 595 </PRE>
Chris@0 596 <DL>
Chris@0 597 <DT>Return value: </DT>
Chris@0 598 <DD>Returns TRUE if normalisation is on and FALSE otherwise.
Chris@0 599 </DL>
Chris@0 600
Chris@0 601 <!-- ========================================================================= -->
Chris@0 602 <A NAME="SFC_GET_NORM_DOUBLE"></A>
Chris@0 603 <H2><BR><B>SFC_GET_NORM_DOUBLE</B></H2>
Chris@0 604 <P>
Chris@0 605 Retrieve the current float normalisation mode.
Chris@0 606 </P>
Chris@0 607 <P>
Chris@0 608 Parameters:
Chris@0 609 </P>
Chris@0 610 <PRE>
Chris@0 611 sndfile : A valid SNDFILE* pointer
Chris@0 612 cmd : SFC_GET_NORM_DOUBLE
Chris@0 613 data : NULL
Chris@0 614 datasize : anything
Chris@0 615 </PRE>
Chris@0 616 <P>
Chris@0 617 Example:
Chris@0 618 </P>
Chris@0 619 <PRE>
Chris@0 620 normalisation = sf_command (sndfile, SFC_GET_NORM_DOUBLE, NULL, 0) ;
Chris@0 621 </PRE>
Chris@0 622 <DL>
Chris@0 623 <DT>Return value: </DT>
Chris@0 624 <DD>Returns TRUE if normalisation is on and FALSE otherwise.
Chris@0 625 </DL>
Chris@0 626
Chris@0 627
Chris@0 628 <!-- ========================================================================= -->
Chris@0 629 <A NAME="SFC_SET_SCALE_FLOAT_INT_READ"></A>
Chris@0 630 <H2><BR><B>SFC_SET_SCALE_FLOAT_INT_READ</B></H2>
Chris@0 631 <P>
Chris@0 632 Set/clear the scale factor when integer (short/int) data is read from a file
Chris@0 633 containing floating point data.
Chris@0 634 </P>
Chris@0 635 <P>
Chris@0 636 Parameters:
Chris@0 637 </P>
Chris@0 638 <PRE>
Chris@0 639 sndfile : A valid SNDFILE* pointer
Chris@0 640 cmd : SFC_SET_SCALE_FLOAT_INT_READ
Chris@0 641 data : NULL
Chris@0 642 datasize : TRUE or FALSE
Chris@0 643 </PRE>
Chris@0 644 <P>
Chris@0 645 Example:
Chris@0 646 </P>
Chris@0 647 <PRE>
Chris@0 648 sf_command (sndfile, SFC_SET_SCALE_FLOAT_INT_READ, NULL, SF_TRUE) ;
Chris@0 649 </PRE>
Chris@0 650 <DL>
Chris@0 651 <DT>Return value: </DT>
Chris@0 652 <DD>Returns the previous SFC_SET_SCALE_FLOAT_INT_READ setting for this file.
Chris@0 653 </DL>
Chris@0 654
Chris@0 655
Chris@0 656 <!-- ========================================================================= -->
Chris@0 657 <A NAME="SFC_SET_SCALE_INT_FLOAT_WRITE"></A>
Chris@0 658 <H2><BR><B>SFC_SET_SCALE_INT_FLOAT_WRITE</B></H2>
Chris@0 659 <P>
Chris@0 660 Set/clear the scale factor when integer (short/int) data is written to a file
Chris@0 661 as floating point data.
Chris@0 662 </P>
Chris@0 663 <P>
Chris@0 664 Parameters:
Chris@0 665 </P>
Chris@0 666 <PRE>
Chris@0 667 sndfile : A valid SNDFILE* pointer
Chris@0 668 cmd : SFC_SET_SCALE_FLOAT_INT_READ
Chris@0 669 data : NULL
Chris@0 670 datasize : TRUE or FALSE
Chris@0 671 </PRE>
Chris@0 672 <P>
Chris@0 673 Example:
Chris@0 674 </P>
Chris@0 675 <PRE>
Chris@0 676 sf_command (sndfile, SFC_SET_SCALE_INT_FLOAT_WRITE, NULL, SF_TRUE) ;
Chris@0 677 </PRE>
Chris@0 678 <DL>
Chris@0 679 <DT>Return value: </DT>
Chris@0 680 <DD>Returns the previous SFC_SET_SCALE_INT_FLOAT_WRITE setting for this file.
Chris@0 681 </DL>
Chris@0 682
Chris@0 683 <!-- ========================================================================= -->
Chris@0 684 <A NAME="SFC_GET_SIMPLE_FORMAT_COUNT"></A>
Chris@0 685 <H2><BR><B>SFC_GET_SIMPLE_FORMAT_COUNT</B></H2>
Chris@0 686 <P>
Chris@0 687 Retrieve the number of simple formats supported by libsndfile.
Chris@0 688 </P>
Chris@0 689 <P>
Chris@0 690 Parameters:
Chris@0 691 </P>
Chris@0 692 <PRE>
Chris@0 693 sndfile : Not used.
Chris@0 694 cmd : SFC_GET_SIMPLE_FORMAT_COUNT
Chris@0 695 data : a pointer to an int
Chris@0 696 datasize : sizeof (int)
Chris@0 697 </PRE>
Chris@0 698 <P>
Chris@0 699 Example:
Chris@0 700 </P>
Chris@0 701 <PRE>
Chris@0 702 int count ;
Chris@0 703 sf_command (sndfile, SFC_GET_SIMPLE_FORMAT_COUNT, &amp;count, sizeof (int)) ;
Chris@0 704 </PRE>
Chris@0 705 <DL>
Chris@0 706 <DT>Return value: </DT>
Chris@0 707 <DD>0
Chris@0 708 </DL>
Chris@0 709
Chris@0 710 <!-- ========================================================================= -->
Chris@0 711 <A NAME="SFC_GET_SIMPLE_FORMAT"></A>
Chris@0 712 <H2><BR><B>SFC_GET_SIMPLE_FORMAT</B></H2>
Chris@0 713 <P>
Chris@0 714 Retrieve information about a simple format.
Chris@0 715 </P>
Chris@0 716 <P>
Chris@0 717 Parameters:
Chris@0 718 </P>
Chris@0 719 <PRE>
Chris@0 720 sndfile : Not used.
Chris@0 721 cmd : SFC_GET_SIMPLE_FORMAT
Chris@0 722 data : a pointer to an SF_FORMAT_INFO struct
Chris@0 723 datasize : sizeof (SF_FORMAT_INFO)
Chris@0 724 </PRE>
Chris@0 725 <P>
Chris@0 726 The SF_FORMAT_INFO struct is defined in &lt;sndfile.h&gt; as:
Chris@0 727 </P>
Chris@0 728 <PRE>
Chris@0 729 typedef struct
Chris@0 730 { int format ;
Chris@0 731 const char *name ;
Chris@0 732 const char *extension ;
Chris@0 733 } SF_FORMAT_INFO ;
Chris@0 734 </PRE>
Chris@0 735 <P>
Chris@0 736 When sf_command() is called with SF_GET_SIMPLE_FORMAT, the value of the format
Chris@0 737 field should be the format number (ie 0 &lt;= format &lt;= count value obtained using
Chris@0 738 SF_GET_SIMPLE_FORMAT_COUNT).
Chris@0 739 </P>
Chris@0 740 <P>
Chris@0 741 Example:
Chris@0 742 </P>
Chris@0 743 <PRE>
Chris@0 744 SF_FORMAT_INFO format_info ;
Chris@0 745 int k, count ;
Chris@0 746
Chris@0 747 sf_command (sndfile, SFC_GET_SIMPLE_FORMAT_COUNT, &amp;count, sizeof (int)) ;
Chris@0 748
Chris@0 749 for (k = 0 ; k &lt; count ; k++)
Chris@0 750 { format_info.format = k ;
Chris@0 751 sf_command (sndfile, SFC_GET_SIMPLE_FORMAT, &amp;format_info, sizeof (format_info)) ;
Chris@0 752 printf ("%08x %s %s\n", format_info.format, format_info.name, format_info.extension) ;
Chris@0 753 } ;
Chris@0 754 </PRE>
Chris@0 755 <DL>
Chris@0 756 <DT>Return value: </DT>
Chris@0 757 <DD>0 on success and non-zero otherwise.
Chris@0 758 <DD>The value of the format field of the SF_FORMAT_INFO struct will be a value which
Chris@0 759 can be placed in the format field of an SF_INFO struct when a file is to be opened
Chris@0 760 for write.
Chris@0 761 <DD>The name field will contain a char* pointer to the name of the string, eg. "WAV (Microsoft 16 bit PCM)".
Chris@0 762 <DD>The extension field will contain the most commonly used file extension for that file type.
Chris@0 763 </DL>
Chris@0 764
Chris@0 765 <!-- ========================================================================= -->
Chris@0 766 <A NAME="SFC_GET_FORMAT_INFO"></A>
Chris@0 767 <H2><BR><B>SFC_GET_FORMAT_INFO</B></H2>
Chris@0 768 <P>
Chris@0 769 Retrieve information about a major or subtype format.
Chris@0 770 </P>
Chris@0 771 <P>
Chris@0 772 Parameters:
Chris@0 773 </P>
Chris@0 774 <PRE>
Chris@0 775 sndfile : Not used.
Chris@0 776 cmd : SFC_GET_FORMAT_INFO
Chris@0 777 data : a pointer to an SF_FORMAT_INFO struct
Chris@0 778 datasize : sizeof (SF_FORMAT_INFO)
Chris@0 779 </PRE>
Chris@0 780 <P>
Chris@0 781 The SF_FORMAT_INFO struct is defined in &lt;sndfile.h&gt; as:
Chris@0 782 </P>
Chris@0 783 <PRE>
Chris@0 784 typedef struct
Chris@0 785 { int format ;
Chris@0 786 const char *name ;
Chris@0 787 const char *extension ;
Chris@0 788 } SF_FORMAT_INFO ;
Chris@0 789 </PRE>
Chris@0 790 <P>
Chris@0 791 When sf_command() is called with SF_GET_FORMAT_INFO, the format field is
Chris@0 792 examined and if (format &amp; SF_FORMAT_TYPEMASK) is a valid format then the struct
Chris@0 793 is filled in with information about the given major type.
Chris@0 794 If (format &amp; SF_FORMAT_TYPEMASK) is FALSE and (format &amp; SF_FORMAT_SUBMASK) is a
Chris@0 795 valid subtype format then the struct is filled in with information about the given
Chris@0 796 subtype.
Chris@0 797 </P>
Chris@0 798 <P>
Chris@0 799 Example:
Chris@0 800 </P>
Chris@0 801 <PRE>
Chris@0 802 SF_FORMAT_INFO format_info ;
Chris@0 803
Chris@0 804 format_info.format = SF_FORMAT_WAV ;
Chris@0 805 sf_command (sndfile, SFC_GET_FORMAT_INFO, &amp;format_info, sizeof (format_info)) ;
Chris@0 806 printf ("%08x %s %s\n", format_info.format, format_info.name, format_info.extension) ;
Chris@0 807
Chris@0 808 format_info.format = SF_FORMAT_ULAW ;
Chris@0 809 sf_command (sndfile, SFC_GET_FORMAT_INFO, &amp;format_info, sizeof (format_info)) ;
Chris@0 810 printf ("%08x %s\n", format_info.format, format_info.name) ;
Chris@0 811 </PRE>
Chris@0 812 <DL>
Chris@0 813 <DT>Return value: </DT>
Chris@0 814 <DD>0 on success and non-zero otherwise.
Chris@0 815 </DL>
Chris@0 816 <!-- ========================================================================= -->
Chris@0 817 <A NAME="SFC_GET_FORMAT_MAJOR_COUNT"></A>
Chris@0 818 <H2><BR><B>SFC_GET_FORMAT_MAJOR_COUNT</B></H2>
Chris@0 819 <P>
Chris@0 820 Retrieve the number of major formats.
Chris@0 821 </P>
Chris@0 822 <P>
Chris@0 823 Parameters:
Chris@0 824 </P>
Chris@0 825 <PRE>
Chris@0 826 sndfile : Not used.
Chris@0 827 cmd : SFC_GET_FORMAT_MAJOR_COUNT
Chris@0 828 data : a pointer to an int
Chris@0 829 datasize : sizeof (int)
Chris@0 830 </PRE>
Chris@0 831 <P>
Chris@0 832 Example:
Chris@0 833 </P>
Chris@0 834 <PRE>
Chris@0 835 int count ;
Chris@0 836 sf_command (sndfile, SFC_GET_FORMAT_MAJOR_COUNT, &amp;count, sizeof (int)) ;
Chris@0 837 </PRE>
Chris@0 838 <DL>
Chris@0 839 <DT>Return value: </DT>
Chris@0 840 <DD>0
Chris@0 841 </DL>
Chris@0 842
Chris@0 843 <!-- ========================================================================= -->
Chris@0 844 <A NAME="SFC_GET_FORMAT_MAJOR"></A>
Chris@0 845 <H2><BR><B>SFC_GET_FORMAT_MAJOR</B></H2>
Chris@0 846 <P>
Chris@0 847 Retrieve information about a major format type.
Chris@0 848 </P>
Chris@0 849 <P>
Chris@0 850 Parameters:
Chris@0 851 </P>
Chris@0 852 <PRE>
Chris@0 853 sndfile : Not used.
Chris@0 854 cmd : SFC_GET_FORMAT_MAJOR
Chris@0 855 data : a pointer to an SF_FORMAT_INFO struct
Chris@0 856 datasize : sizeof (SF_FORMAT_INFO)
Chris@0 857 </PRE>
Chris@0 858 <P>
Chris@0 859 Example:
Chris@0 860 </P>
Chris@0 861 <PRE>
Chris@0 862 SF_FORMAT_INFO format_info ;
Chris@0 863 int k, count ;
Chris@0 864
Chris@0 865 sf_command (sndfile, SFC_GET_FORMAT_MAJOR_COUNT, &amp;count, sizeof (int)) ;
Chris@0 866
Chris@0 867 for (k = 0 ; k &lt; count ; k++)
Chris@0 868 { format_info.format = k ;
Chris@0 869 sf_command (sndfile, SFC_GET_FORMAT_MAJOR, &amp;format_info, sizeof (format_info)) ;
Chris@0 870 printf ("%08x %s %s\n", format_info.format, format_info.name, format_info.extension) ;
Chris@0 871 } ;
Chris@0 872 </PRE>
Chris@0 873 <P>
Chris@0 874 For a more comprehensive example, see the program list_formats.c in the examples/
Chris@0 875 directory of the libsndfile source code distribution.
Chris@0 876 </P>
Chris@0 877 <DL>
Chris@0 878 <DT>Return value: </DT>
Chris@0 879 <DD>0 on success and non-zero otherwise.
Chris@0 880 <DD>The value of the format field will be one of the major format identifiers such as
Chris@0 881 SF_FORMAT_WAV or SF_FORMAT_AIFF.
Chris@0 882 <DD>The name field will contain a char* pointer to the name of the string, eg. "WAV (Microsoft)".
Chris@0 883 <DD>The extension field will contain the most commonly used file extension for that file type.
Chris@0 884 </DL>
Chris@0 885
Chris@0 886 <!-- ========================================================================= -->
Chris@0 887 <A NAME="SFC_GET_FORMAT_SUBTYPE_COUNT"></A>
Chris@0 888 <H2><BR><B>SFC_GET_FORMAT_SUBTYPE_COUNT</B></H2>
Chris@0 889 <P>
Chris@0 890 Retrieve the number of subformats.
Chris@0 891 </P>
Chris@0 892 <P>
Chris@0 893 Parameters:
Chris@0 894 </P>
Chris@0 895 <PRE>
Chris@0 896 sndfile : Not used.
Chris@0 897 cmd : SFC_GET_FORMAT_SUBTYPE_COUNT
Chris@0 898 data : a pointer to an int
Chris@0 899 datasize : sizeof (int)
Chris@0 900 </PRE>
Chris@0 901 <P>
Chris@0 902 Example:
Chris@0 903 </P>
Chris@0 904 <PRE>
Chris@0 905 int count ;
Chris@0 906 sf_command (sndfile, SFC_GET_FORMAT_SUBTYPE_COUNT, &amp;count, sizeof (int)) ;
Chris@0 907 </PRE>
Chris@0 908 <DL>
Chris@0 909 <DT>Return value: </DT>
Chris@0 910 <DD>0
Chris@0 911 </DL>
Chris@0 912
Chris@0 913 <!-- ========================================================================= -->
Chris@0 914 <A NAME="SFC_GET_FORMAT_SUBTYPE"></A>
Chris@0 915 <H2><BR><B>SFC_GET_FORMAT_SUBTYPE</B></H2>
Chris@0 916 <P>
Chris@0 917 Enumerate the subtypes (this function does not translate a subtype into
Chris@0 918 a string describing that subtype).
Chris@0 919 A typical use case might be retrieving a string description of all subtypes
Chris@0 920 so that a dialog box can be filled in.
Chris@0 921 </P>
Chris@0 922 <P>
Chris@0 923
Chris@0 924 </P>
Chris@0 925 <P>
Chris@0 926 Parameters:
Chris@0 927 </P>
Chris@0 928 <PRE>
Chris@0 929 sndfile : Not used.
Chris@0 930 cmd : SFC_GET_FORMAT_SUBTYPE
Chris@0 931 data : a pointer to an SF_FORMAT_INFO struct
Chris@0 932 datasize : sizeof (SF_FORMAT_INFO)
Chris@0 933 </PRE>
Chris@0 934 <P>
Chris@0 935 Example 1: Retrieve all sybtypes supported by the WAV format.
Chris@0 936 </P>
Chris@0 937 <PRE>
Chris@0 938 SF_FORMAT_INFO format_info ;
Chris@0 939 int k, count ;
Chris@0 940
Chris@0 941 sf_command (sndfile, SFC_GET_FORMAT_SUBTYPE_COUNT, &amp;count, sizeof (int)) ;
Chris@0 942
Chris@0 943 for (k = 0 ; k &lt; count ; k++)
Chris@0 944 { format_info.format = k ;
Chris@0 945 sf_command (sndfile, SFC_GET_FORMAT_SUBTYPE, &amp;format_info, sizeof (format_info)) ;
Chris@0 946 if (! sf_format_check (format_info.format | SF_FORMAT_WAV))
Chris@0 947 continue ;
Chris@0 948 printf ("%08x %s\n", format_info.format, format_info.name) ;
Chris@0 949 } ;
Chris@0 950 </PRE>
Chris@0 951 <P>
Chris@0 952 Example 2: Print a string describing the SF_FORMAT_PCM_16 subtype.
Chris@0 953 </P>
Chris@0 954 <PRE>
Chris@0 955 SF_FORMAT_INFO format_info ;
Chris@0 956 int k, count ;
Chris@0 957
Chris@0 958 sf_command (sndfile, SFC_GET_FORMAT_SUBTYPE_COUNT, &amp;count, sizeof (int)) ;
Chris@0 959
Chris@0 960 for (k = 0 ; k &lt; count ; k++)
Chris@0 961 { format_info.format = k ;
Chris@0 962 sf_command (sndfile, SFC_GET_FORMAT_SUBTYPE, &amp;format_info, sizeof (format_info)) ;
Chris@0 963 if (format_info.format == SF_FORMAT_PCM_16)
Chris@0 964 { printf ("%08x %s\n", format_info.format, format_info.name) ;
Chris@0 965 break ;
Chris@0 966 } ;
Chris@0 967 } ;
Chris@0 968 </PRE>
Chris@0 969 <P>
Chris@0 970 For a more comprehensive example, see the program list_formats.c in the examples/
Chris@0 971 directory of the libsndfile source code distribution.
Chris@0 972 </P>
Chris@0 973 <DL>
Chris@0 974 <DT>Return value: </DT>
Chris@0 975 <DD>0 on success and non-zero otherwise.
Chris@0 976 <DD>The value of the format field will be one of the major format identifiers such as
Chris@0 977 SF_FORMAT_WAV or SF_FORMAT_AIFF.
Chris@0 978 <DD>The name field will contain a char* pointer to the name of the string; for instance
Chris@0 979 "WAV (Microsoft)" or "AIFF (Apple/SGI)".
Chris@0 980 <DD>The extension field will be a NULL pointer.
Chris@0 981 </DL>
Chris@0 982
Chris@0 983 <!-- ========================================================================= -->
Chris@0 984 <A NAME="SFC_SET_ADD_PEAK_CHUNK"></A>
Chris@0 985 <H2><BR><B>SFC_SET_ADD_PEAK_CHUNK</B></H2>
Chris@0 986 <P>
Chris@0 987 By default, WAV and AIFF files which contain floating point data (subtype SF_FORMAT_FLOAT
Chris@0 988 or SF_FORMAT_DOUBLE) have a PEAK chunk.
Chris@0 989 By using this command, the addition of a PEAK chunk can be turned on or off.
Chris@0 990 </P>
Chris@0 991 <P>
Chris@0 992 Note : This call must be made before any data is written to the file.
Chris@0 993 </P>
Chris@0 994 <P>
Chris@0 995 Parameters:
Chris@0 996 <PRE>
Chris@0 997 sndfile : A valid SNDFILE* pointer
Chris@0 998 cmd : SFC_SET_ADD_PEAK_CHUNK
Chris@0 999 data : Not used (should be NULL)
Chris@0 1000 datasize : TRUE or FALSE.
Chris@0 1001 </PRE>
Chris@0 1002 <P>
Chris@0 1003 Example:
Chris@0 1004 </P>
Chris@0 1005 <PRE>
Chris@0 1006 /* Turn on the PEAK chunk. */
Chris@0 1007 sf_command (sndfile, SFC_SET_ADD_PEAK_CHUNK, NULL, SF_TRUE) ;
Chris@0 1008
Chris@0 1009 /* Turn off the PEAK chunk. */
Chris@0 1010 sf_command (sndfile, SFC_SET_ADD_PEAK_CHUNK, NULL, SF_FALSE) ;
Chris@0 1011 </PRE>
Chris@0 1012 <DL>
Chris@0 1013 <DT>Return value:</DT>
Chris@0 1014 <DD>Returns SF_TRUE if the peak chunk will be written after this call.
Chris@0 1015 <DD>Returns SF_FALSE if the peak chunk will not be written after this call.
Chris@0 1016 </DL>
Chris@0 1017
Chris@0 1018 <!-- ========================================================================= -->
Chris@0 1019 <A NAME="SFC_UPDATE_HEADER_NOW"></A>
Chris@0 1020 <H2><BR><B>SFC_UPDATE_HEADER_NOW</B></H2>
Chris@0 1021 <P>
Chris@0 1022 The header of an audio file is normally written by libsndfile when the file is
Chris@0 1023 closed using <B>sf_close()</B>.
Chris@0 1024 </P>
Chris@0 1025 <P>
Chris@0 1026 There are however situations where large files are being generated and it would
Chris@0 1027 be nice to have valid data in the header before the file is complete.
Chris@0 1028 Using this command will update the file header to reflect the amount of data written
Chris@0 1029 to the file so far.
Chris@0 1030 Other programs opening the file for read (before any more data is written) will
Chris@0 1031 then read a valid sound file header.
Chris@0 1032 </P>
Chris@0 1033 <P>
Chris@0 1034 Parameters:
Chris@0 1035 <PRE>
Chris@0 1036 sndfile : A valid SNDFILE* pointer
Chris@0 1037 cmd : SFC_UPDATE_HEADER_NOW
Chris@0 1038 data : Not used (should be NULL)
Chris@0 1039 datasize : Not used.
Chris@0 1040 </PRE>
Chris@0 1041 <P>
Chris@0 1042 Example:
Chris@0 1043 </P>
Chris@0 1044 <PRE>
Chris@0 1045 /* Update the header now. */
Chris@0 1046 sf_command (sndfile, SFC_UPDATE_HEADER_NOW, NULL, 0) ;
Chris@0 1047 </PRE>
Chris@0 1048 <DL>
Chris@0 1049 <DT>Return value:</DT>
Chris@0 1050 <DD>0
Chris@0 1051 </DL>
Chris@0 1052
Chris@0 1053 <!-- ========================================================================= -->
Chris@0 1054 <A NAME="SFC_SET_UPDATE_HEADER_AUTO"></A>
Chris@0 1055 <H2><BR><B>SFC_SET_UPDATE_HEADER_AUTO</B></H2>
Chris@0 1056 <P>
Chris@0 1057 Similar to SFC_UPDATE_HEADER_NOW but updates the header at the end of every call
Chris@0 1058 to the <B>sf_write*</B> functions.
Chris@0 1059 </P>
Chris@0 1060 <P>
Chris@0 1061 Parameters:
Chris@0 1062 <PRE>
Chris@0 1063 sndfile : A valid SNDFILE* pointer
Chris@0 1064 cmd : SFC_UPDATE_HEADER_NOW
Chris@0 1065 data : Not used (should be NULL)
Chris@0 1066 datasize : SF_TRUE or SF_FALSE
Chris@0 1067 </PRE>
Chris@0 1068 <P>
Chris@0 1069 Example:
Chris@0 1070 </P>
Chris@0 1071 <PRE>
Chris@0 1072 /* Turn on auto header update. */
Chris@0 1073 sf_command (sndfile, SFC_SET_UPDATE_HEADER_AUTO, NULL, SF_TRUE) ;
Chris@0 1074
Chris@0 1075 /* Turn off auto header update. */
Chris@0 1076 sf_command (sndfile, SFC_SET_UPDATE_HEADER_AUTO, NULL, SF_FALSE) ;
Chris@0 1077 </PRE>
Chris@0 1078 <DL>
Chris@0 1079 <DT>Return value:</DT>
Chris@0 1080 <DD>TRUE if auto update header is now on; FALSE otherwise.
Chris@0 1081 </DL>
Chris@0 1082
Chris@0 1083 <!-- ========================================================================= -->
Chris@0 1084 <A NAME="SFC_FILE_TRUNCATE"></A>
Chris@0 1085 <H2><BR><B>SFC_FILE_TRUNCATE</B></H2>
Chris@0 1086 <P>
Chris@0 1087 Truncate a file that was opened for write or read/write.
Chris@0 1088 </P>
Chris@0 1089 <P>
Chris@0 1090 Parameters:
Chris@0 1091 <PRE>
Chris@0 1092 sndfile : A valid SNDFILE* pointer
Chris@0 1093 cmd : SFC_FILE_TRUNCATE
Chris@0 1094 data : A pointer to an sf_count_t.
Chris@0 1095 datasize : sizeof (sf_count_t)
Chris@0 1096 </PRE>
Chris@0 1097
Chris@0 1098 <P>
Chris@0 1099 Truncate the file to the number of frames specified by the sf_count_t pointed
Chris@0 1100 to by data.
Chris@0 1101 After this command, both the read and the write pointer will be
Chris@0 1102 at the new end of the file.
Chris@0 1103 This command will fail (returning non-zero) if the requested truncate position
Chris@0 1104 is beyond the end of the file.
Chris@0 1105 </P>
Chris@0 1106 <P>
Chris@0 1107 Example:
Chris@0 1108 </P>
Chris@0 1109 <PRE>
Chris@0 1110 /* Truncate the file to a length of 20 frames. */
Chris@0 1111 sf_count_t frames = 20 ;
Chris@0 1112 sf_command (sndfile, SFC_FILE_TRUNCATE, &amp;frames, sizeof (frames)) ;
Chris@0 1113 </PRE>
Chris@0 1114 <DL>
Chris@0 1115 <DT>Return value:</DT>
Chris@0 1116 <DD>Zero on sucess, non-zero otherwise.
Chris@0 1117 </DL>
Chris@0 1118
Chris@0 1119 <!-- ========================================================================= -->
Chris@0 1120 <A NAME="SFC_SET_RAW_START_OFFSET"></A>
Chris@0 1121 <H2><BR><B>SFC_SET_RAW_START_OFFSET</B></H2>
Chris@0 1122 <P>
Chris@0 1123 Change the data start offset for files opened up as SF_FORMAT_RAW.
Chris@0 1124 </P>
Chris@0 1125 <P>
Chris@0 1126 Parameters:
Chris@0 1127 <PRE>
Chris@0 1128 sndfile : A valid SNDFILE* pointer
Chris@0 1129 cmd : SFC_SET_RAW_START_OFFSET
Chris@0 1130 data : A pointer to an sf_count_t.
Chris@0 1131 datasize : sizeof (sf_count_t)
Chris@0 1132 </PRE>
Chris@0 1133
Chris@0 1134 <P>
Chris@0 1135 For a file opened as format SF_FORMAT_RAW, set the data offset to the value
Chris@0 1136 given by data.
Chris@0 1137 </P>
Chris@0 1138 <P>
Chris@0 1139 Example:
Chris@0 1140 </P>
Chris@0 1141 <PRE>
Chris@0 1142 /* Reset the data offset to 5 bytes from the start of the file. */
Chris@0 1143 sf_count_t offset = 5 ;
Chris@0 1144 sf_command (sndfile, SFC_SET_RAW_START_OFFSET, &amp;offset, sizeof (offset)) ;
Chris@0 1145 </PRE>
Chris@0 1146 <DL>
Chris@0 1147 <DT>Return value:</DT>
Chris@0 1148 <DD>Zero on success, non-zero otherwise.
Chris@0 1149 </DL>
Chris@0 1150
Chris@0 1151 <!-- ========================================================================= -->
Chris@0 1152 <A NAME="SFC_SET_CLIPPING"></A>
Chris@0 1153 <H2><BR><B>SFC_SET_CLIPPING</B></H2>
Chris@0 1154 <P>
Chris@0 1155 Turn on/off automatic clipping when doing floating point to integer conversion.
Chris@0 1156 </P>
Chris@0 1157 <P>
Chris@0 1158 Parameters:
Chris@0 1159 <PRE>
Chris@0 1160 sndfile : A valid SNDFILE* pointer
Chris@0 1161 cmd : SFC_SET_CLIPPING
Chris@0 1162 data : NULL
Chris@0 1163 datasize : SF_TRUE or SF_FALSE.
Chris@0 1164 </PRE>
Chris@0 1165
Chris@0 1166 <P>
Chris@0 1167 Turn on (datasize == SF_TRUE) or off (datasize == SF_FALSE) clipping.
Chris@0 1168 </P>
Chris@0 1169 <P>
Chris@0 1170 Example:
Chris@0 1171 </P>
Chris@0 1172 <PRE>
Chris@0 1173 sf_command (sndfile, SFC_SET_CLIPPING, NULL, SF_TRUE) ;
Chris@0 1174 </PRE>
Chris@0 1175 <DL>
Chris@0 1176 <DT>Return value:</DT>
Chris@0 1177 <DD>Clipping mode (SF_TRUE or SF_FALSE).
Chris@0 1178 </DL>
Chris@0 1179
Chris@0 1180
Chris@0 1181 <!-- ========================================================================= -->
Chris@0 1182 <A NAME="SFC_GET_CLIPPING"></A>
Chris@0 1183 <H2><BR><B>SFC_GET_CLIPPING</B></H2>
Chris@0 1184 <P>
Chris@0 1185 Turn on/off automatic clipping when doing floating point to integer conversion.
Chris@0 1186 </P>
Chris@0 1187 <P>
Chris@0 1188 Parameters:
Chris@0 1189 <PRE>
Chris@0 1190 sndfile : A valid SNDFILE* pointer
Chris@0 1191 cmd : SFC_GET_CLIPPING
Chris@0 1192 data : NULL
Chris@0 1193 datasize : 0
Chris@0 1194 </PRE>
Chris@0 1195
Chris@0 1196 <P>
Chris@0 1197 Retrieve the current cliiping setting.
Chris@0 1198 </P>
Chris@0 1199 <P>
Chris@0 1200 Example:
Chris@0 1201 </P>
Chris@0 1202 <PRE>
Chris@0 1203 sf_command (sndfile, SFC_GET_CLIPPING, NULL, 0) ;
Chris@0 1204 </PRE>
Chris@0 1205 <DL>
Chris@0 1206 <DT>Return value:</DT>
Chris@0 1207 <DD>Clipping mode (SF_TRUE or SF_FALSE).
Chris@0 1208 </DL>
Chris@0 1209
Chris@0 1210 <!-- ========================================================================= -->
Chris@0 1211 <A NAME="SFC_GET_EMBED_FILE_INFO"></A>
Chris@0 1212 <H2><BR><B>SFC_GET_EMBED_FILE_INFO</B></H2>
Chris@0 1213 <P>
Chris@0 1214 Get the file offset and file length of a file enbedded within another
Chris@0 1215 larger file.
Chris@0 1216 </P>
Chris@0 1217 <P>
Chris@0 1218 Parameters:
Chris@0 1219 <PRE>
Chris@0 1220 sndfile : A valid SNDFILE* pointer
Chris@0 1221 cmd : SFC_GET_CLIPPING
Chris@0 1222 data : a pointer to an SF_EMBED_FILE_INFO struct
Chris@0 1223 datasize : sizeof (SF_EMBED_FILE_INFO)
Chris@0 1224 </PRE>
Chris@0 1225 <P>
Chris@0 1226 The SF_EMBED_FILE_INFO struct is defined in &lt;sndfile.h&gt; as:
Chris@0 1227 </P>
Chris@0 1228 <PRE>
Chris@0 1229 typedef struct
Chris@0 1230 { sf_count_t offset ;
Chris@0 1231 sf_count_t length ;
Chris@0 1232 } SF_EMBED_FILE_INFO ;
Chris@0 1233 </PRE>
Chris@0 1234 <DL>
Chris@0 1235 <DT>Return value: </DT>
Chris@0 1236 <DD>0 on success and non-zero otherwise.
Chris@0 1237 <DD>The value of the offset field of the SF_EMBED_FILE_INFO struct will be
Chris@0 1238 the offsets in bytes from the start of the outer file to the start of
Chris@0 1239 the audio file.
Chris@0 1240 <DD>The value of the offset field of the SF_EMBED_FILE_INFO struct will be
Chris@0 1241 the length in bytes of the embedded file.
Chris@0 1242 </DL>
Chris@0 1243
Chris@0 1244
Chris@0 1245
Chris@0 1246 <!-- ========================================================================= -->
Chris@0 1247 <A NAME="SFC_WAVEX_GET_AMBISONIC"></A>
Chris@0 1248 <H2><BR><B>SFC_WAVEX_GET_AMBISONIC</B></H2>
Chris@0 1249 <P>
Chris@0 1250 Test if the current file has the GUID of a WAVEX file for any of the Ambisonic
Chris@0 1251 formats.
Chris@0 1252 </P>
Chris@0 1253 <P>
Chris@0 1254 Parameters:
Chris@0 1255 <PRE>
Chris@0 1256 sndfile : A valid SNDFILE* pointer
Chris@0 1257 cmd : SFC_WAVEX_GET_AMBISONIC
Chris@0 1258 data : NULL
Chris@0 1259 datasize : 0
Chris@0 1260 </PRE>
Chris@0 1261 <P>
Chris@0 1262 The Ambisonic WAVEX formats are defined here :
Chris@0 1263 <A HREF="http://dream.cs.bath.ac.uk/researchdev/wave-ex/bformat.html">
Chris@0 1264 http://dream.cs.bath.ac.uk/researchdev/wave-ex/bformat.html</A>.
Chris@0 1265 </P>
Chris@0 1266 <DL>
Chris@0 1267 <DT>Return value: </DT>
Chris@0 1268 <DD>SF_AMBISONIC_NONE or SF_AMBISONIC_B_FORMAT or zero if the file format
Chris@0 1269 does not support ambisonic formats.
Chris@0 1270 </DL>
Chris@0 1271
Chris@0 1272 <!-- ========================================================================= -->
Chris@0 1273 <A NAME="SFC_WAVEX_SET_AMBISONIC"></A>
Chris@0 1274 <H2><BR><B>SFC_WAVEX_SET_AMBISONIC</B></H2>
Chris@0 1275 <P>
Chris@0 1276 Set the GUID of a new WAVEX file to indicate an Ambisonics format.
Chris@0 1277 </P>
Chris@0 1278 <P>
Chris@0 1279 Parameters:
Chris@0 1280 <PRE>
Chris@0 1281 sndfile : A valid SNDFILE* pointer
Chris@0 1282 cmd : SFC_WAVEX_SET_AMBISONIC
Chris@0 1283 data : NULL
Chris@0 1284 datasize : SF_AMBISONIC_NONE or SF_AMBISONIC_B_FORMAT
Chris@0 1285 </PRE>
Chris@0 1286 <P>
Chris@0 1287 Turn on (SF_AMBISONIC_B_FORMAT) or off (SF_AMBISONIC_NONE) encoding.
Chris@0 1288 This command is currently only supported for files with SF_FORMAT_WAVEX format.
Chris@0 1289 </P>
Chris@0 1290 <P>
Chris@0 1291 The Ambisonic WAVEX formats are defined here :
Chris@0 1292 <A HREF="http://dream.cs.bath.ac.uk/researchdev/wave-ex/bformat.html">
Chris@0 1293 http://dream.cs.bath.ac.uk/researchdev/wave-ex/bformat.html</A>.
Chris@0 1294 </P>
Chris@0 1295 <DL>
Chris@0 1296 <DT>Return value: </DT>
Chris@0 1297 <DD>Return the ambisonic value that has just been set or zero if the file
Chris@0 1298 format does not support ambisonic encoding.
Chris@0 1299 </DL>
Chris@0 1300
Chris@0 1301 <!-- ========================================================================= -->
Chris@0 1302 <A NAME="SFC_SET_VBR_ENCODING_QUALITY"></A>
Chris@0 1303 <H2><BR><B>SFC_SET_VBR_ENCODING_QUALITY</B></H2>
Chris@0 1304 <P>
Chris@0 1305 Set the the Variable Bit Rate encoding quality.
Chris@0 1306 The encoding quality value should be between 0.0 (lowest quality) and 1.0
Chris@0 1307 (highest quality).
Chris@0 1308 </P>
Chris@0 1309 <P>
Chris@0 1310 Parameters:
Chris@0 1311 <PRE>
Chris@0 1312 sndfile : A valid SNDFILE* pointer
Chris@0 1313 cmd : SFC_SET_VBR_ENCODING_QUALITY
Chris@0 1314 data : A pointer to a double value
Chris@0 1315 datasize : sizeof (double)
Chris@0 1316 </PRE>
Chris@0 1317 <P>
Chris@0 1318 The command must be sent before any audio data is written to the file.
Chris@0 1319 </P>
Chris@0 1320 <P>
Chris@0 1321 </P>
Chris@0 1322 <DL>
Chris@0 1323 <DT>Return value: </DT>
Chris@0 1324 <DD>Zero on success, non-zero otherwise.
Chris@0 1325 </DL>
Chris@0 1326
Chris@0 1327 <!-- ========================================================================= -->
Chris@0 1328 <A NAME="SFC_RAW_NEEDS_ENDSWAP"></A>
Chris@0 1329 <H2><BR><B>SFC_RAW_NEEDS_ENDSWAP</B></H2>
Chris@0 1330 <P>
Chris@0 1331 Determine if raw data read using
Chris@0 1332 <a href="api.html#raw">
Chris@0 1333 sf_read_raw</a>
Chris@0 1334 needs to be end swapped on the host CPU.
Chris@0 1335 </P>
Chris@0 1336 <P>
Chris@0 1337 For instance, will return SF_TRUE on when reading WAV containing
Chris@0 1338 SF_FORMAT_PCM_16 data on a big endian machine and SF_FALSE on a little endian
Chris@0 1339 machine.
Chris@0 1340 </P>
Chris@0 1341 <P>
Chris@0 1342 Parameters:
Chris@0 1343 <PRE>
Chris@0 1344 sndfile : A valid SNDFILE* pointer
Chris@0 1345 cmd : SFC_RAW_NEEDS_ENDSWAP
Chris@0 1346 data : NULL
Chris@0 1347 datasize : 0
Chris@0 1348 </PRE>
Chris@0 1349
Chris@0 1350 <DL>
Chris@0 1351 <DT>Return value: </DT>
Chris@0 1352 <DD>SF_TRUE or SF_FALSE
Chris@0 1353 </DL>
Chris@0 1354
Chris@0 1355
Chris@0 1356 <!-- ========================================================================= -->
Chris@0 1357 <A NAME="SFC_GET_BROADCAST_INFO"></A>
Chris@0 1358 <H2><BR><B>SFC_GET_BROADCAST_INFO</B></H2>
Chris@0 1359 <P>
Chris@0 1360 Retrieve the Broadcast Extension Chunk from WAV (and related) files.
Chris@0 1361 </P>
Chris@0 1362 <p>
Chris@0 1363 Parameters:
Chris@0 1364 </p>
Chris@0 1365 <PRE>
Chris@0 1366 sndfile : A valid SNDFILE* pointer
Chris@0 1367 cmd : SFC_GET_BROADCAST_INFO
Chris@0 1368 data : a pointer to an SF_BROADCAST_INFO struct
Chris@0 1369 datasize : sizeof (SF_BROADCAST_INFO)
Chris@0 1370 </PRE>
Chris@0 1371 <P>
Chris@0 1372 The SF_BROADCAST_INFO struct is defined in &lt;sndfile.h&gt; as:
Chris@0 1373 </P>
Chris@0 1374 <PRE>
Chris@0 1375 typedef struct
Chris@0 1376 { char description [256] ;
Chris@0 1377 char originator [32] ;
Chris@0 1378 char originator_reference [32] ;
Chris@0 1379 char origination_date [10] ;
Chris@0 1380 char origination_time [8] ;
Chris@0 1381 unsigned int time_reference_low ;
Chris@0 1382 unsigned int time_reference_high ;
Chris@0 1383 short version ;
Chris@0 1384 char umid [64] ;
Chris@0 1385 char reserved [190] ;
Chris@0 1386 unsigned int coding_history_size ;
Chris@0 1387 char coding_history [256] ;
Chris@0 1388 } SF_BROADCAST_INFO ;
Chris@0 1389 </PRE>
Chris@0 1390
Chris@0 1391 <DL>
Chris@0 1392 <DT>Return value: </DT>
Chris@0 1393 <DD>SF_TRUE if the file contained a Broadcast Extension chunk or SF_FALSE
Chris@0 1394 otherwise.
Chris@0 1395 </DL>
Chris@0 1396
Chris@0 1397 <!-- ========================================================================= -->
Chris@0 1398 <A NAME="SFC_SET_BROADCAST_INFO"></A>
Chris@0 1399 <H2><BR><B>SFC_SET_BROADCAST_INFO</B></H2>
Chris@0 1400 <P>
Chris@0 1401 Set the Broadcast Extension Chunk for WAV (and related) files.
Chris@0 1402 </P>
Chris@0 1403 <p>
Chris@0 1404 Parameters:
Chris@0 1405 </p>
Chris@0 1406 <PRE>
Chris@0 1407 sndfile : A valid SNDFILE* pointer
Chris@0 1408 cmd : SFC_SET_BROADCAST_INFO
Chris@0 1409 data : a pointer to an SF_BROADCAST_INFO struct
Chris@0 1410 datasize : sizeof (SF_BROADCAST_INFO)
Chris@0 1411 </PRE>
Chris@0 1412
Chris@0 1413 <DL>
Chris@0 1414 <DT>Return value: </DT>
Chris@0 1415 <DD>SF_TRUE if setting the Broadcast Extension chunk was successful and SF_FALSE
Chris@0 1416 otherwise.
Chris@0 1417 </DL>
Chris@0 1418 <!-- ========================================================================= -->
Chris@0 1419
Chris@0 1420 <A NAME="SFC_GET_LOOP_INFO"></A>
Chris@0 1421 <H2><BR><B>SFC_GET_LOOP_INFO</B></H2>
Chris@0 1422 <P>
Chris@0 1423 Retrieve loop information for file including time signature, length in
Chris@0 1424 beats and original MIDI base note
Chris@0 1425 </P>
Chris@0 1426 <p>
Chris@0 1427 Parameters:
Chris@0 1428 </p>
Chris@0 1429 <PRE>
Chris@0 1430 sndfile : A valid SNDFILE* pointer
Chris@0 1431 cmd : SFC_GET_LOOP_INFO
Chris@0 1432 data : a pointer to an SF_LOOP_INFO struct
Chris@0 1433 datasize : sizeof (SF_LOOP_INFO)
Chris@0 1434 </PRE>
Chris@0 1435 <P>
Chris@0 1436 The SF_BROADCAST_INFO struct is defined in &lt;sndfile.h&gt; as:
Chris@0 1437 </P>
Chris@0 1438 <PRE>
Chris@0 1439 typedef struct
Chris@0 1440 { short time_sig_num ; /* any positive integer > 0 */
Chris@0 1441 short time_sig_den ; /* any positive power of 2 > 0 */
Chris@0 1442 int loop_mode ; /* see SF_LOOP enum */
Chris@0 1443
Chris@0 1444 int num_beats ; /* this is NOT the amount of quarter notes !!!*/
Chris@0 1445 /* a full bar of 4/4 is 4 beats */
Chris@0 1446 /* a full bar of 7/8 is 7 beats */
Chris@0 1447
Chris@0 1448 float bpm ; /* suggestion, as it can be calculated using other fields:*/
Chris@0 1449 /* file's lenght, file's sampleRate and our time_sig_den*/
Chris@0 1450 /* -> bpms are always the amount of _quarter notes_ per minute */
Chris@0 1451
Chris@0 1452 int root_key ; /* MIDI note, or -1 for None */
Chris@0 1453 int future [6] ;
Chris@0 1454 } SF_LOOP_INFO ;
Chris@0 1455 </PRE>
Chris@0 1456 <P>
Chris@0 1457 Example:
Chris@0 1458 </P>
Chris@0 1459 <PRE>
Chris@0 1460 SF_LOOP_INFO loop;
Chris@0 1461 sf_command (sndfile, SFC_GET_LOOP_INFO, &amp;loop, sizeof (loop)) ;
Chris@0 1462 </PRE>
Chris@0 1463 <DL>
Chris@0 1464 <DT>Return value:</DT>
Chris@0 1465 <DD>SF_TRUE if the file header contains loop information for the file.
Chris@0 1466 SF_FALSE otherwise.
Chris@0 1467 </DL>
Chris@0 1468
Chris@0 1469 <!-- ========================================================================= -->
Chris@0 1470
Chris@0 1471
Chris@0 1472 <A NAME="SFC_GET_INSTRUMENT"></A>
Chris@0 1473 <H2><BR><B>SFC_GET_INSTRUMENT</B></H2>
Chris@0 1474 <P>
Chris@0 1475 Retrieve instrument information from file including MIDI base note,
Chris@0 1476 keyboard mapping and looping informations(start/stop and mode).
Chris@0 1477 </P>
Chris@0 1478 <p>
Chris@0 1479 Parameters:
Chris@0 1480 </p>
Chris@0 1481 <PRE>
Chris@0 1482 sndfile : A valid SNDFILE* pointer
Chris@0 1483 cmd : SFC_GET_INSTRUMENT
Chris@0 1484 data : a pointer to an SF_INSTRUMENT struct
Chris@0 1485 datasize : sizeof (SF_INSTRUMENT)
Chris@0 1486 </PRE>
Chris@0 1487
Chris@0 1488 <P>
Chris@0 1489 The SF_INSTRUMENT struct is defined in &lt;sndfile.h&gt; as:
Chris@0 1490 </P>
Chris@0 1491 <PRE>
Chris@0 1492 enum
Chris@0 1493 { /*
Chris@0 1494 ** The loop mode field in SF_INSTRUMENT will be one of the following.
Chris@0 1495 */
Chris@0 1496 SF_LOOP_NONE = 800,
Chris@0 1497 SF_LOOP_FORWARD,
Chris@0 1498 SF_LOOP_BACKWARD,
Chris@0 1499 SF_LOOP_ALTERNATING
Chris@0 1500 } ;
Chris@0 1501
Chris@0 1502 typedef struct
Chris@0 1503 { int gain ;
Chris@0 1504 char basenote, detune ;
Chris@0 1505 char velocity_lo, velocity_hi ;
Chris@0 1506 char key_lo, key_hi ;
Chris@0 1507 int loop_count ;
Chris@0 1508
Chris@0 1509 struct
Chris@0 1510 { int mode ;
Chris@0 1511 unsigned int start ;
Chris@0 1512 unsigned int end ;
Chris@0 1513 unsigned int count ;
Chris@0 1514 } loops [16] ; /* make variable in a sensible way */
Chris@0 1515 } SF_INSTRUMENT ;
Chris@0 1516 </PRE>
Chris@0 1517
Chris@0 1518 <P>
Chris@0 1519 Example:
Chris@0 1520 </P>
Chris@0 1521 <PRE>
Chris@0 1522 SF_INSTRUMENT inst ;
Chris@0 1523 sf_command (sndfile, SFC_GET_INSTRUMENT, &amp;inst, sizeof (inst)) ;
Chris@0 1524 </PRE>
Chris@0 1525 <DL>
Chris@0 1526 <DT>Return value:</DT>
Chris@0 1527 <dd>SF_TRUE if the file header contains instrument information for the
Chris@0 1528 file. SF_FALSE otherwise.
Chris@0 1529 </DL>
Chris@0 1530
Chris@0 1531 <!-- ========================================================================= -->
Chris@0 1532
Chris@0 1533
Chris@0 1534 <A NAME="SFC_SET_INSTRUMENT"></A>
Chris@0 1535 <H2><BR><B>SFC_SET_INSTRUMENT</B></H2>
Chris@0 1536 <P>
Chris@0 1537 Set the instrument information for the file.
Chris@0 1538 </P>
Chris@0 1539 <p>
Chris@0 1540 Parameters:
Chris@0 1541 </p>
Chris@0 1542 <PRE>
Chris@0 1543 sndfile : A valid SNDFILE* pointer
Chris@0 1544 cmd : SFC_GET_INSTRUMENT
Chris@0 1545 data : a pointer to an SF_INSTRUMENT struct
Chris@0 1546 datasize : sizeof (SF_INSTRUMENT)
Chris@0 1547 </PRE>
Chris@0 1548 <P>
Chris@0 1549 Example:
Chris@0 1550 </P>
Chris@0 1551 <PRE>
Chris@0 1552 SF_INSTRUMENT inst ;
Chris@0 1553 sf_command (sndfile, SFC_SET_INSTRUMENT, &amp;inst, sizeof (inst)) ;
Chris@0 1554 </PRE>
Chris@0 1555 <DL>
Chris@0 1556 <DT>Return value:</DT>
Chris@0 1557 <dd>SF_TRUE if the file header contains instrument information for the
Chris@0 1558 file. SF_FALSE otherwise.
Chris@0 1559 </DL>
Chris@0 1560
Chris@0 1561 <!-- ========================================================================= -->
Chris@0 1562
Chris@0 1563
Chris@0 1564 <A NAME="SFC_SET_VBR_ENCODING_QUALITY"></A>
Chris@0 1565 <H2><BR><B>SFC_SET_VBR_ENCODING_QUALITY</B></H2>
Chris@0 1566 <P>
Chris@0 1567 Set the Variable Bite Rate encoding quality.
Chris@0 1568 Currenly only implemented fro Ogg/Vorbis files.
Chris@0 1569 </P>
Chris@0 1570 <p>
Chris@0 1571 Parameters:
Chris@0 1572 </p>
Chris@0 1573 <PRE>
Chris@0 1574 sndfile : A valid SNDFILE* pointer
Chris@0 1575 cmd : SFC_SET_VBR_ENCODING_QUALITY
Chris@0 1576 data : a pointer to double specifing VBR quality
Chris@0 1577 datasize : sizeof (double)
Chris@0 1578 </PRE>
Chris@0 1579 <P>
Chris@0 1580 Example:
Chris@0 1581 </P>
Chris@0 1582 <PRE>
Chris@0 1583 double quality = 0.5 ;
Chris@0 1584 sf_command (sndfile, SFC_SET_VBR_ENCODING_QUALITY, &amp;quality, sizeof (double)) ;
Chris@0 1585 </PRE>
Chris@0 1586 <DL>
Chris@0 1587 <DT>Return value:</DT>
Chris@0 1588 <dd>SF_TRUE if VBR encoding quality was set.
Chris@0 1589 SF_FALSE otherwise.
Chris@0 1590 </DL>
Chris@0 1591
Chris@0 1592 <!-- ========================================================================= -->
Chris@0 1593
Chris@0 1594
Chris@0 1595 <HR>
Chris@0 1596 <P>
Chris@0 1597 The libsndfile home page is here :
Chris@0 1598 <A HREF="http://www.mega-nerd.com/libsndfile/">
Chris@0 1599 http://www.mega-nerd.com/libsndfile/</A>.
Chris@0 1600 <BR>
Chris@0 1601 Version : 1.0.25
Chris@0 1602 </P>
Chris@0 1603
Chris@0 1604 </BODY>
Chris@0 1605 </HTML>