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185 lines
7.1 KiB
C
185 lines
7.1 KiB
C
/* libFLAC - Free Lossless Audio Codec library
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* Copyright (C) 2004-2009 Josh Coalson
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* Copyright (C) 2011-2013 Xiph.Org Foundation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of the Xiph.org Foundation nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef FLAC__CALLBACK_H
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#define FLAC__CALLBACK_H
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#include "ordinals.h"
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#include <stdlib.h> /* for size_t */
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/** \file include/FLAC/callback.h
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*
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* \brief
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* This module defines the structures for describing I/O callbacks
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* to the other FLAC interfaces.
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*
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* See the detailed documentation for callbacks in the
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* \link flac_callbacks callbacks \endlink module.
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*/
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/** \defgroup flac_callbacks FLAC/callback.h: I/O callback structures
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* \ingroup flac
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*
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* \brief
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* This module defines the structures for describing I/O callbacks
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* to the other FLAC interfaces.
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*
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* The purpose of the I/O callback functions is to create a common way
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* for the metadata interfaces to handle I/O.
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*
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* Originally the metadata interfaces required filenames as the way of
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* specifying FLAC files to operate on. This is problematic in some
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* environments so there is an additional option to specify a set of
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* callbacks for doing I/O on the FLAC file, instead of the filename.
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*
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* In addition to the callbacks, a FLAC__IOHandle type is defined as an
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* opaque structure for a data source.
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*
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* The callback function prototypes are similar (but not identical) to the
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* stdio functions fread, fwrite, fseek, ftell, feof, and fclose. If you use
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* stdio streams to implement the callbacks, you can pass fread, fwrite, and
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* fclose anywhere a FLAC__IOCallback_Read, FLAC__IOCallback_Write, or
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* FLAC__IOCallback_Close is required, and a FILE* anywhere a FLAC__IOHandle
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* is required. \warning You generally CANNOT directly use fseek or ftell
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* for FLAC__IOCallback_Seek or FLAC__IOCallback_Tell since on most systems
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* these use 32-bit offsets and FLAC requires 64-bit offsets to deal with
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* large files. You will have to find an equivalent function (e.g. ftello),
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* or write a wrapper. The same is true for feof() since this is usually
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* implemented as a macro, not as a function whose address can be taken.
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*
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* \{
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** This is the opaque handle type used by the callbacks. Typically
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* this is a \c FILE* or address of a file descriptor.
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*/
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typedef void* FLAC__IOHandle;
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/** Signature for the read callback.
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* The signature and semantics match POSIX fread() implementations
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* and can generally be used interchangeably.
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*
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* \param ptr The address of the read buffer.
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* \param size The size of the records to be read.
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* \param nmemb The number of records to be read.
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* \param handle The handle to the data source.
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* \retval size_t
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* The number of records read.
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*/
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typedef size_t (*FLAC__IOCallback_Read) (void *ptr, size_t size, size_t nmemb, FLAC__IOHandle handle);
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/** Signature for the write callback.
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* The signature and semantics match POSIX fwrite() implementations
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* and can generally be used interchangeably.
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*
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* \param ptr The address of the write buffer.
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* \param size The size of the records to be written.
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* \param nmemb The number of records to be written.
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* \param handle The handle to the data source.
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* \retval size_t
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* The number of records written.
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*/
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typedef size_t (*FLAC__IOCallback_Write) (const void *ptr, size_t size, size_t nmemb, FLAC__IOHandle handle);
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/** Signature for the seek callback.
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* The signature and semantics mostly match POSIX fseek() WITH ONE IMPORTANT
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* EXCEPTION: the offset is a 64-bit type whereas fseek() is generally 'long'
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* and 32-bits wide.
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*
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* \param handle The handle to the data source.
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* \param offset The new position, relative to \a whence
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* \param whence \c SEEK_SET, \c SEEK_CUR, or \c SEEK_END
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* \retval int
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* \c 0 on success, \c -1 on error.
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*/
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typedef int (*FLAC__IOCallback_Seek) (FLAC__IOHandle handle, FLAC__int64 offset, int whence);
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/** Signature for the tell callback.
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* The signature and semantics mostly match POSIX ftell() WITH ONE IMPORTANT
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* EXCEPTION: the offset is a 64-bit type whereas ftell() is generally 'long'
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* and 32-bits wide.
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*
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* \param handle The handle to the data source.
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* \retval FLAC__int64
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* The current position on success, \c -1 on error.
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*/
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typedef FLAC__int64 (*FLAC__IOCallback_Tell) (FLAC__IOHandle handle);
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/** Signature for the EOF callback.
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* The signature and semantics mostly match POSIX feof() but WATCHOUT:
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* on many systems, feof() is a macro, so in this case a wrapper function
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* must be provided instead.
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*
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* \param handle The handle to the data source.
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* \retval int
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* \c 0 if not at end of file, nonzero if at end of file.
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*/
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typedef int (*FLAC__IOCallback_Eof) (FLAC__IOHandle handle);
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/** Signature for the close callback.
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* The signature and semantics match POSIX fclose() implementations
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* and can generally be used interchangeably.
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*
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* \param handle The handle to the data source.
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* \retval int
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* \c 0 on success, \c EOF on error.
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*/
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typedef int (*FLAC__IOCallback_Close) (FLAC__IOHandle handle);
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/** A structure for holding a set of callbacks.
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* Each FLAC interface that requires a FLAC__IOCallbacks structure will
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* describe which of the callbacks are required. The ones that are not
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* required may be set to NULL.
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*
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* If the seek requirement for an interface is optional, you can signify that
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* a data sorce is not seekable by setting the \a seek field to \c NULL.
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*/
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typedef struct {
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FLAC__IOCallback_Read read;
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FLAC__IOCallback_Write write;
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FLAC__IOCallback_Seek seek;
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FLAC__IOCallback_Tell tell;
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FLAC__IOCallback_Eof eof;
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FLAC__IOCallback_Close close;
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} FLAC__IOCallbacks;
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/* \} */
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#ifdef __cplusplus
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}
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#endif
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#endif
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