libs/libsndfile/src/sndfile.h.in

   1 /*
   2 ** Copyright (C) 1999-2006 Erik de Castro Lopo <erikd@mega-nerd.com>
   3 **
   4 ** This program is free software; you can redistribute it and/or modify
   5 ** it under the terms of the GNU Lesser General Public License as published by
   6 ** the Free Software Foundation; either version 2.1 of the License, or
   7 ** (at your option) any later version.
   8 **
   9 ** This program is distributed in the hope that it will be useful,
  10 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 ** GNU Lesser General Public License for more details.
  13 **
  14 ** You should have received a copy of the GNU Lesser General Public License
  15 ** along with this program; if not, write to the Free Software
  16 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17 */
  18
  19 /*
  20 ** sndfile.h -- system-wide definitions
  21 **
  22 ** API documentation is in the doc/ directory of the source code tarball
  23 ** and at http://www.mega-nerd.com/libsndfile/api.html.
  24 */
  25
  26 #ifndef SNDFILE_H
  27 #define SNDFILE_H
  28
  29 /* This is the version 1.0.X header file. */
  30 #define SNDFILE_1
  31
  32 #include <stdio.h>
  33
  34 /* For the Metrowerks CodeWarrior Pro Compiler (mainly MacOS) */
  35
  36 #if     (defined (__MWERKS__))
  37 #include        <unix.h>
  38 #else
  39 #include        <sys/types.h>
  40 #endif
  41
  42 #ifdef __cplusplus
  43 extern "C" {
  44 #endif  /* __cplusplus */
  45
  46 /* The following file types can be read and written.
  47 ** A file type would consist of a major type (ie SF_FORMAT_WAV) bitwise
  48 ** ORed with a minor type (ie SF_FORMAT_PCM). SF_FORMAT_TYPEMASK and
  49 ** SF_FORMAT_SUBMASK can be used to separate the major and minor file
  50 ** types.
  51 */
  52
  53 enum
  54 {       /* Major formats. */
  55         SF_FORMAT_WAV                   = 0x010000,             /* Microsoft WAV format (little endian default). */
  56         SF_FORMAT_AIFF                  = 0x020000,             /* Apple/SGI AIFF format (big endian). */
  57         SF_FORMAT_AU                    = 0x030000,             /* Sun/NeXT AU format (big endian). */
  58         SF_FORMAT_RAW                   = 0x040000,             /* RAW PCM data. */
  59         SF_FORMAT_PAF                   = 0x050000,             /* Ensoniq PARIS file format. */
  60         SF_FORMAT_SVX                   = 0x060000,             /* Amiga IFF / SVX8 / SV16 format. */
  61         SF_FORMAT_NIST                  = 0x070000,             /* Sphere NIST format. */
  62         SF_FORMAT_VOC                   = 0x080000,             /* VOC files. */
  63         SF_FORMAT_IRCAM                 = 0x0A0000,             /* Berkeley/IRCAM/CARL */
  64         SF_FORMAT_W64                   = 0x0B0000,             /* Sonic Foundry's 64 bit RIFF/WAV */
  65         SF_FORMAT_MAT4                  = 0x0C0000,             /* Matlab (tm) V4.2 / GNU Octave 2.0 */
  66         SF_FORMAT_MAT5                  = 0x0D0000,             /* Matlab (tm) V5.0 / GNU Octave 2.1 */
  67         SF_FORMAT_PVF                   = 0x0E0000,             /* Portable Voice Format */
  68         SF_FORMAT_XI                    = 0x0F0000,             /* Fasttracker 2 Extended Instrument */
  69         SF_FORMAT_HTK                   = 0x100000,             /* HMM Tool Kit format */
  70         SF_FORMAT_SDS                   = 0x110000,             /* Midi Sample Dump Standard */
  71         SF_FORMAT_AVR                   = 0x120000,             /* Audio Visual Research */
  72         SF_FORMAT_WAVEX                 = 0x130000,             /* MS WAVE with WAVEFORMATEX */
  73         SF_FORMAT_SD2                   = 0x160000,             /* Sound Designer 2 */
  74         SF_FORMAT_FLAC                  = 0x170000,             /* FLAC lossless file format */
  75         SF_FORMAT_CAF                   = 0x180000,             /* Core Audio File format */
  76
  77         /* Subtypes from here on. */
  78
  79         SF_FORMAT_PCM_S8                = 0x0001,               /* Signed 8 bit data */
  80         SF_FORMAT_PCM_16                = 0x0002,               /* Signed 16 bit data */
  81         SF_FORMAT_PCM_24                = 0x0003,               /* Signed 24 bit data */
  82         SF_FORMAT_PCM_32                = 0x0004,               /* Signed 32 bit data */
  83
  84         SF_FORMAT_PCM_U8                = 0x0005,               /* Unsigned 8 bit data (WAV and RAW only) */
  85
  86         SF_FORMAT_FLOAT                 = 0x0006,               /* 32 bit float data */
  87         SF_FORMAT_DOUBLE                = 0x0007,               /* 64 bit float data */
  88
  89         SF_FORMAT_ULAW                  = 0x0010,               /* U-Law encoded. */
  90         SF_FORMAT_ALAW                  = 0x0011,               /* A-Law encoded. */
  91         SF_FORMAT_IMA_ADPCM             = 0x0012,               /* IMA ADPCM. */
  92         SF_FORMAT_MS_ADPCM              = 0x0013,               /* Microsoft ADPCM. */
  93
  94         SF_FORMAT_GSM610                = 0x0020,               /* GSM 6.10 encoding. */
  95         SF_FORMAT_VOX_ADPCM             = 0x0021,               /* OKI / Dialogix ADPCM */
  96
  97         SF_FORMAT_G721_32               = 0x0030,               /* 32kbs G721 ADPCM encoding. */
  98         SF_FORMAT_G723_24               = 0x0031,               /* 24kbs G723 ADPCM encoding. */
  99         SF_FORMAT_G723_40               = 0x0032,               /* 40kbs G723 ADPCM encoding. */
 100
 101         SF_FORMAT_DWVW_12               = 0x0040,               /* 12 bit Delta Width Variable Word encoding. */
 102         SF_FORMAT_DWVW_16               = 0x0041,               /* 16 bit Delta Width Variable Word encoding. */
 103         SF_FORMAT_DWVW_24               = 0x0042,               /* 24 bit Delta Width Variable Word encoding. */
 104         SF_FORMAT_DWVW_N                = 0x0043,               /* N bit Delta Width Variable Word encoding. */
 105
 106         SF_FORMAT_DPCM_8                = 0x0050,               /* 8 bit differential PCM (XI only) */
 107         SF_FORMAT_DPCM_16               = 0x0051,               /* 16 bit differential PCM (XI only) */
 108
 109         /* Endian-ness options. */
 110
 111         SF_ENDIAN_FILE                  = 0x00000000,   /* Default file endian-ness. */
 112         SF_ENDIAN_LITTLE                = 0x10000000,   /* Force little endian-ness. */
 113         SF_ENDIAN_BIG                   = 0x20000000,   /* Force big endian-ness. */
 114         SF_ENDIAN_CPU                   = 0x30000000,   /* Force CPU endian-ness. */
 115
 116         SF_FORMAT_SUBMASK               = 0x0000FFFF,
 117         SF_FORMAT_TYPEMASK              = 0x0FFF0000,
 118         SF_FORMAT_ENDMASK               = 0x30000000
 119 } ;
 120
 121 /*
 122 ** The following are the valid command numbers for the sf_command()
 123 ** interface.  The use of these commands is documented in the file
 124 ** command.html in the doc directory of the source code distribution.
 125 */
 126
 127 enum
 128 {       SFC_GET_LIB_VERSION                             = 0x1000,
 129         SFC_GET_LOG_INFO                                = 0x1001,
 130
 131         SFC_GET_NORM_DOUBLE                             = 0x1010,
 132         SFC_GET_NORM_FLOAT                              = 0x1011,
 133         SFC_SET_NORM_DOUBLE                             = 0x1012,
 134         SFC_SET_NORM_FLOAT                              = 0x1013,
 135         SFC_SET_SCALE_FLOAT_INT_READ    = 0x1014,
 136
 137         SFC_GET_SIMPLE_FORMAT_COUNT             = 0x1020,
 138         SFC_GET_SIMPLE_FORMAT                   = 0x1021,
 139
 140         SFC_GET_FORMAT_INFO                             = 0x1028,
 141
 142         SFC_GET_FORMAT_MAJOR_COUNT              = 0x1030,
 143         SFC_GET_FORMAT_MAJOR                    = 0x1031,
 144         SFC_GET_FORMAT_SUBTYPE_COUNT    = 0x1032,
 145         SFC_GET_FORMAT_SUBTYPE                  = 0x1033,
 146
 147         SFC_CALC_SIGNAL_MAX                             = 0x1040,
 148         SFC_CALC_NORM_SIGNAL_MAX                = 0x1041,
 149         SFC_CALC_MAX_ALL_CHANNELS               = 0x1042,
 150         SFC_CALC_NORM_MAX_ALL_CHANNELS  = 0x1043,
 151         SFC_GET_SIGNAL_MAX                              = 0x1044,
 152         SFC_GET_MAX_ALL_CHANNELS                = 0x1045,
 153
 154         SFC_SET_ADD_PEAK_CHUNK                  = 0x1050,
 155
 156         SFC_UPDATE_HEADER_NOW                   = 0x1060,
 157         SFC_SET_UPDATE_HEADER_AUTO              = 0x1061,
 158
 159         SFC_FILE_TRUNCATE                               = 0x1080,
 160
 161         SFC_SET_RAW_START_OFFSET                = 0x1090,
 162
 163         SFC_SET_DITHER_ON_WRITE                 = 0x10A0,
 164         SFC_SET_DITHER_ON_READ                  = 0x10A1,
 165
 166         SFC_GET_DITHER_INFO_COUNT               = 0x10A2,
 167         SFC_GET_DITHER_INFO                             = 0x10A3,
 168
 169         SFC_GET_EMBED_FILE_INFO                 = 0x10B0,
 170
 171         SFC_SET_CLIPPING                                = 0x10C0,
 172         SFC_GET_CLIPPING                                = 0x10C1,
 173
 174         SFC_GET_INSTRUMENT                              = 0x10D0,
 175         SFC_SET_INSTRUMENT                              = 0x10D1,
 176
 177         SFC_GET_LOOP_INFO                               = 0x10E0,
 178
 179         SFC_GET_BROADCAST_INFO                  = 0x10F0,
 180         SFC_SET_BROADCAST_INFO                  = 0x10F1,
 181
 182         /* Following commands for testing only. */
 183         SFC_TEST_IEEE_FLOAT_REPLACE             = 0x6001,
 184
 185         /*
 186         ** SFC_SET_ADD_* values are deprecated and will disappear at some
 187         ** time in the future. They are guaranteed to be here up to and
 188         ** including version 1.0.8 to avoid breakage of existng software.
 189         ** They currently do nothing and will continue to do nothing.
 190         */
 191         SFC_SET_ADD_DITHER_ON_WRITE             = 0x1070,
 192         SFC_SET_ADD_DITHER_ON_READ              = 0x1071
 193 } ;
 194
 195
 196 /*
 197 ** String types that can be set and read from files. Not all file types
 198 ** support this and even the file types which support one, may not support
 199 ** all string types.
 200 */
 201
 202 enum
 203 {       SF_STR_TITLE                                    = 0x01,
 204         SF_STR_COPYRIGHT                                = 0x02,
 205         SF_STR_SOFTWARE                                 = 0x03,
 206         SF_STR_ARTIST                                   = 0x04,
 207         SF_STR_COMMENT                                  = 0x05,
 208         SF_STR_DATE                                             = 0x06
 209 } ;
 210
 211 /*
 212 ** Use the following as the start and end index when doing metadata
 213 ** transcoding.
 214 */
 215
 216 #define SF_STR_FIRST    SF_STR_TITLE
 217 #define SF_STR_LAST             SF_STR_DATE
 218
 219 enum
 220 {       /* True and false */
 221         SF_FALSE        = 0,
 222         SF_TRUE         = 1,
 223
 224         /* Modes for opening files. */
 225         SFM_READ        = 0x10,
 226         SFM_WRITE       = 0x20,
 227         SFM_RDWR        = 0x30
 228 } ;
 229
 230 /* Public error values. These are guaranteed to remain unchanged for the duration
 231 ** of the library major version number.
 232 ** There are also a large number of private error numbers which are internal to
 233 ** the library which can change at any time.
 234 */
 235
 236 enum
 237 {       SF_ERR_NO_ERROR                         = 0,
 238         SF_ERR_UNRECOGNISED_FORMAT      = 1,
 239         SF_ERR_SYSTEM                           = 2,
 240         SF_ERR_MALFORMED_FILE           = 3,
 241         SF_ERR_UNSUPPORTED_ENCODING     = 4
 242 } ;
 243
 244 /* A SNDFILE* pointer can be passed around much like stdio.h's FILE* pointer. */
 245
 246 typedef struct SNDFILE_tag      SNDFILE ;
 247
 248 /* The following typedef is system specific and is defined when libsndfile is.
 249 ** compiled. sf_count_t can be one of loff_t (Linux), off_t (*BSD),
 250 ** off64_t (Solaris), __int64_t (Win32) etc.
 251 */
 252
 253 typedef @TYPEOF_SF_COUNT_T@     sf_count_t ;
 254
 255 #define SF_COUNT_MAX            @SF_COUNT_MAX@
 256
 257 /* A pointer to a SF_INFO structure is passed to sf_open_read () and filled in.
 258 ** On write, the SF_INFO structure is filled in by the user and passed into
 259 ** sf_open_write ().
 260 */
 261
 262 struct SF_INFO
 263 {       sf_count_t      frames ;                /* Used to be called samples.  Changed to avoid confusion. */
 264         int                     samplerate ;
 265         int                     channels ;
 266         int                     format ;
 267         int                     sections ;
 268         int                     seekable ;
 269 } ;
 270
 271 typedef struct SF_INFO SF_INFO ;
 272
 273 /* The SF_FORMAT_INFO struct is used to retrieve information about the sound
 274 ** file formats libsndfile supports using the sf_command () interface.
 275 **
 276 ** Using this interface will allow applications to support new file formats
 277 ** and encoding types when libsndfile is upgraded, without requiring
 278 ** re-compilation of the application.
 279 **
 280 ** Please consult the libsndfile documentation (particularly the information
 281 ** on the sf_command () interface) for examples of its use.
 282 */
 283
 284 typedef struct
 285 {       int                     format ;
 286         const char      *name ;
 287         const char      *extension ;
 288 } SF_FORMAT_INFO ;
 289
 290 /*
 291 ** Enums and typedefs for adding dither on read and write.
 292 ** See the html documentation for sf_command(), SFC_SET_DITHER_ON_WRITE
 293 ** and SFC_SET_DITHER_ON_READ.
 294 */
 295
 296 enum
 297 {       SFD_DEFAULT_LEVEL       = 0,
 298         SFD_CUSTOM_LEVEL        = 0x40000000,
 299
 300         SFD_NO_DITHER           = 500,
 301         SFD_WHITE                       = 501,
 302         SFD_TRIANGULAR_PDF      = 502
 303 } ;
 304
 305 typedef struct
 306 {       int                     type ;
 307         double          level ;
 308         const char      *name ;
 309 } SF_DITHER_INFO ;
 310
 311 /* Struct used to retrieve information about a file embedded within a
 312 ** larger file. See SFC_GET_EMBED_FILE_INFO.
 313 */
 314
 315 typedef struct
 316 {       sf_count_t      offset ;
 317         sf_count_t      length ;
 318 } SF_EMBED_FILE_INFO ;
 319
 320 /*
 321 **      Structs used to retrieve music sample information from a file.
 322 */
 323
 324 enum
 325 {       /*
 326         **      The loop mode field in SF_INSTRUMENT will be one of the following.
 327         */
 328         SF_LOOP_NONE = 800,
 329         SF_LOOP_FORWARD,
 330         SF_LOOP_BACKWARD,
 331         SF_LOOP_ALTERNATING
 332 } ;
 333
 334 typedef struct
 335 {       int gain ;
 336         char basenote, detune ;
 337         char velocity_lo, velocity_hi ;
 338         char key_lo, key_hi ;
 339         int loop_count ;
 340
 341         struct
 342         {       int mode ;
 343                 unsigned int start ;
 344                 unsigned int end ;
 345                 unsigned int count ;
 346         } loops [16] ; /* make variable in a sensible way */
 347 } SF_INSTRUMENT ;
 348
 349
 350
 351 /* Struct used to retrieve loop information from a file.*/
 352 typedef struct
 353 {
 354         short   time_sig_num ;  /* any positive integer    > 0  */
 355         short   time_sig_den ;  /* any positive power of 2 > 0  */
 356         int             loop_mode ;             /* see SF_LOOP enum             */
 357
 358         int             num_beats ;             /* this is NOT the amount of quarter notes !!!*/
 359                                                         /* a full bar of 4/4 is 4 beats */
 360                                                         /* a full bar of 7/8 is 7 beats */
 361
 362         float   bpm ;                   /* suggestion, as it can be calculated using other fields:*/
 363                                                         /* file's lenght, file's sampleRate and our time_sig_den*/
 364                                                         /* -> bpms are always the amount of _quarter notes_ per minute */
 365
 366         int     root_key ;                      /* MIDI note, or -1 for None */
 367         int future [6] ;
 368 } SF_LOOP_INFO ;
 369
 370
 371 /*      Struct used to retrieve broadcast (EBU) information from a file.
 372 **      Strongly (!) based on EBU "bext" chunk format used in Broadcast WAVE.
 373 */
 374 typedef struct
 375 {       char                    description [256] ;
 376         char                    originator [32] ;
 377         char                    originator_reference [32] ;
 378         char                    origination_date [10] ;
 379         char                    origination_time [8] ;
 380         int                             time_reference_low ;
 381         int                             time_reference_high ;
 382         short                   version ;
 383         char                    umid [64] ;
 384         char                    reserved [190] ;
 385         unsigned int    coding_history_size ;
 386         char                    coding_history [256] ;
 387 } SF_BROADCAST_INFO ;
 388
 389 typedef sf_count_t              (*sf_vio_get_filelen)   (void *user_data) ;
 390 typedef sf_count_t              (*sf_vio_seek)          (sf_count_t offset, int whence, void *user_data) ;
 391 typedef sf_count_t              (*sf_vio_read)          (void *ptr, sf_count_t count, void *user_data) ;
 392 typedef sf_count_t              (*sf_vio_write)         (const void *ptr, sf_count_t count, void *user_data) ;
 393 typedef sf_count_t              (*sf_vio_tell)          (void *user_data) ;
 394
 395 struct SF_VIRTUAL_IO
 396 {       sf_vio_get_filelen      get_filelen ;
 397         sf_vio_seek                     seek ;
 398         sf_vio_read                     read ;
 399         sf_vio_write            write ;
 400         sf_vio_tell                     tell ;
 401 } ;
 402
 403 typedef struct SF_VIRTUAL_IO SF_VIRTUAL_IO ;
 404
 405 /* Open the specified file for read, write or both. On error, this will
 406 ** return a NULL pointer. To find the error number, pass a NULL SNDFILE
 407 ** to sf_perror () or sf_error_str ().
 408 ** All calls to sf_open() should be matched with a call to sf_close().
 409 */
 410
 411 SNDFILE*        sf_open         (const char *path, int mode, SF_INFO *sfinfo) ;
 412
 413 /* Use the existing file descriptor to create a SNDFILE object. If close_desc
 414 ** is TRUE, the file descriptor will be closed when sf_close() is called. If
 415 ** it is FALSE, the descritor will not be closed.
 416 ** When passed a descriptor like this, the library will assume that the start
 417 ** of file header is at the current file offset. This allows sound files within
 418 ** larger container files to be read and/or written.
 419 ** On error, this will return a NULL pointer. To find the error number, pass a
 420 ** NULL SNDFILE to sf_perror () or sf_error_str ().
 421 ** All calls to sf_open_fd() should be matched with a call to sf_close().
 422
 423 */
 424
 425 SNDFILE*        sf_open_fd      (int fd, int mode, SF_INFO *sfinfo, int close_desc) ;
 426
 427 SNDFILE*        sf_open_virtual (SF_VIRTUAL_IO *sfvirtual, int mode, SF_INFO *sfinfo, void *user_data) ;
 428
 429 /* sf_error () returns a error number which can be translated to a text
 430 ** string using sf_error_number().
 431 */
 432
 433 int             sf_error                (SNDFILE *sndfile) ;
 434
 435 /* sf_strerror () returns to the caller a pointer to the current error message for
 436 ** the given SNDFILE.
 437 */
 438
 439 const char* sf_strerror (SNDFILE *sndfile) ;
 440
 441 /* sf_error_number () allows the retrieval of the error string for each internal
 442 ** error number.
 443 **
 444 */
 445
 446 const char*     sf_error_number (int errnum) ;
 447
 448 /* The following three error functions are deprecated but they will remain in the
 449 ** library for the forseeable future. The function sf_strerror() should be used
 450 ** in their place.
 451 */
 452
 453 int             sf_perror               (SNDFILE *sndfile) ;
 454 int             sf_error_str    (SNDFILE *sndfile, char* str, size_t len) ;
 455
 456
 457 /* Return TRUE if fields of the SF_INFO struct are a valid combination of values. */
 458
 459 int             sf_command      (SNDFILE *sndfile, int command, void *data, int datasize) ;
 460
 461 /* Return TRUE if fields of the SF_INFO struct are a valid combination of values. */
 462
 463 int             sf_format_check (const SF_INFO *info) ;
 464
 465 /* Seek within the waveform data chunk of the SNDFILE. sf_seek () uses
 466 ** the same values for whence (SEEK_SET, SEEK_CUR and SEEK_END) as
 467 ** stdio.h function fseek ().
 468 ** An offset of zero with whence set to SEEK_SET will position the
 469 ** read / write pointer to the first data sample.
 470 ** On success sf_seek returns the current position in (multi-channel)
 471 ** samples from the start of the file.
 472 ** Please see the libsndfile documentation for moving the read pointer
 473 ** separately from the write pointer on files open in mode SFM_RDWR.
 474 ** On error all of these functions return -1.
 475 */
 476
 477 sf_count_t      sf_seek                 (SNDFILE *sndfile, sf_count_t frames, int whence) ;
 478
 479 /* Functions for retrieving and setting string data within sound files.
 480 ** Not all file types support this features; AIFF and WAV do. For both
 481 ** functions, the str_type parameter must be one of the SF_STR_* values
 482 ** defined above.
 483 ** On error, sf_set_string() returns non-zero while sf_get_string()
 484 ** returns NULL.
 485 */
 486
 487 int sf_set_string (SNDFILE *sndfile, int str_type, const char* str) ;
 488
 489 const char* sf_get_string (SNDFILE *sndfile, int str_type) ;
 490
 491 /* Functions for reading/writing the waveform data of a sound file.
 492 */
 493
 494 sf_count_t      sf_read_raw             (SNDFILE *sndfile, void *ptr, sf_count_t bytes) ;
 495 sf_count_t      sf_write_raw    (SNDFILE *sndfile, const void *ptr, sf_count_t bytes) ;
 496
 497 /* Functions for reading and writing the data chunk in terms of frames.
 498 ** The number of items actually read/written = frames * number of channels.
 499 **     sf_xxxx_raw              read/writes the raw data bytes from/to the file
 500 **     sf_xxxx_short    passes data in the native short format
 501 **     sf_xxxx_int              passes data in the native int format
 502 **     sf_xxxx_float    passes data in the native float format
 503 **     sf_xxxx_double   passes data in the native double format
 504 ** All of these read/write function return number of frames read/written.
 505 */
 506
 507 sf_count_t      sf_readf_short  (SNDFILE *sndfile, short *ptr, sf_count_t frames) ;
 508 sf_count_t      sf_writef_short (SNDFILE *sndfile, const short *ptr, sf_count_t frames) ;
 509
 510 sf_count_t      sf_readf_int    (SNDFILE *sndfile, int *ptr, sf_count_t frames) ;
 511 sf_count_t      sf_writef_int   (SNDFILE *sndfile, const int *ptr, sf_count_t frames) ;
 512
 513 sf_count_t      sf_readf_float  (SNDFILE *sndfile, float *ptr, sf_count_t frames) ;
 514 sf_count_t      sf_writef_float (SNDFILE *sndfile, const float *ptr, sf_count_t frames) ;
 515
 516 sf_count_t      sf_readf_double         (SNDFILE *sndfile, double *ptr, sf_count_t frames) ;
 517 sf_count_t      sf_writef_double        (SNDFILE *sndfile, const double *ptr, sf_count_t frames) ;
 518
 519 /* Functions for reading and writing the data chunk in terms of items.
 520 ** Otherwise similar to above.
 521 ** All of these read/write function return number of items read/written.
 522 */
 523
 524 sf_count_t      sf_read_short   (SNDFILE *sndfile, short *ptr, sf_count_t items) ;
 525 sf_count_t      sf_write_short  (SNDFILE *sndfile, const short *ptr, sf_count_t items) ;
 526
 527 sf_count_t      sf_read_int             (SNDFILE *sndfile, int *ptr, sf_count_t items) ;
 528 sf_count_t      sf_write_int    (SNDFILE *sndfile, const int *ptr, sf_count_t items) ;
 529
 530 sf_count_t      sf_read_float   (SNDFILE *sndfile, float *ptr, sf_count_t items) ;
 531 sf_count_t      sf_write_float  (SNDFILE *sndfile, const float *ptr, sf_count_t items) ;
 532
 533 sf_count_t      sf_read_double  (SNDFILE *sndfile, double *ptr, sf_count_t items) ;
 534 sf_count_t      sf_write_double (SNDFILE *sndfile, const double *ptr, sf_count_t items) ;
 535
 536 /* Close the SNDFILE and clean up all memory allocations associated with this
 537 ** file.
 538 ** Returns 0 on success, or an error number.
 539 */
 540
 541 int             sf_close                (SNDFILE *sndfile) ;
 542
 543 /* If the file is opened SFM_WRITE or SFM_RDWR, call fsync() on the file
 544 ** to force the writing of data to disk. If the file is opened SFM_READ
 545 ** no action is taken.
 546 */
 547
 548 void    sf_write_sync   (SNDFILE *sndfile) ;
 549
 550 #ifdef __cplusplus
 551 }               /* extern "C" */
 552 #endif  /* __cplusplus */
 553
 554 #endif  /* SNDFILE_H */