mirror of
https://github.com/RetroDECK/Duckstation.git
synced 2024-11-24 22:55:41 +00:00
186 lines
7.1 KiB
C
186 lines
7.1 KiB
C
/* libFLAC - Free Lossless Audio Codec library
|
|
* Copyright (C) 2004-2009 Josh Coalson
|
|
* Copyright (C) 2011-2016 Xiph.Org Foundation
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* - Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* - Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* - Neither the name of the Xiph.org Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
|
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef FLAC__CALLBACK_H
|
|
#define FLAC__CALLBACK_H
|
|
|
|
#include "ordinals.h"
|
|
#include <stdlib.h> /* for size_t */
|
|
|
|
/** \file include/FLAC/callback.h
|
|
*
|
|
* \brief
|
|
* This module defines the structures for describing I/O callbacks
|
|
* to the other FLAC interfaces.
|
|
*
|
|
* See the detailed documentation for callbacks in the
|
|
* \link flac_callbacks callbacks \endlink module.
|
|
*/
|
|
|
|
/** \defgroup flac_callbacks FLAC/callback.h: I/O callback structures
|
|
* \ingroup flac
|
|
*
|
|
* \brief
|
|
* This module defines the structures for describing I/O callbacks
|
|
* to the other FLAC interfaces.
|
|
*
|
|
* The purpose of the I/O callback functions is to create a common way
|
|
* for the metadata interfaces to handle I/O.
|
|
*
|
|
* Originally the metadata interfaces required filenames as the way of
|
|
* specifying FLAC files to operate on. This is problematic in some
|
|
* environments so there is an additional option to specify a set of
|
|
* callbacks for doing I/O on the FLAC file, instead of the filename.
|
|
*
|
|
* In addition to the callbacks, a FLAC__IOHandle type is defined as an
|
|
* opaque structure for a data source.
|
|
*
|
|
* The callback function prototypes are similar (but not identical) to the
|
|
* stdio functions fread, fwrite, fseek, ftell, feof, and fclose. If you use
|
|
* stdio streams to implement the callbacks, you can pass fread, fwrite, and
|
|
* fclose anywhere a FLAC__IOCallback_Read, FLAC__IOCallback_Write, or
|
|
* FLAC__IOCallback_Close is required, and a FILE* anywhere a FLAC__IOHandle
|
|
* is required. \warning You generally CANNOT directly use fseek or ftell
|
|
* for FLAC__IOCallback_Seek or FLAC__IOCallback_Tell since on most systems
|
|
* these use 32-bit offsets and FLAC requires 64-bit offsets to deal with
|
|
* large files. You will have to find an equivalent function (e.g. ftello),
|
|
* or write a wrapper. The same is true for feof() since this is usually
|
|
* implemented as a macro, not as a function whose address can be taken.
|
|
*
|
|
* \{
|
|
*/
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/** This is the opaque handle type used by the callbacks. Typically
|
|
* this is a \c FILE* or address of a file descriptor.
|
|
*/
|
|
typedef void* FLAC__IOHandle;
|
|
|
|
/** Signature for the read callback.
|
|
* The signature and semantics match POSIX fread() implementations
|
|
* and can generally be used interchangeably.
|
|
*
|
|
* \param ptr The address of the read buffer.
|
|
* \param size The size of the records to be read.
|
|
* \param nmemb The number of records to be read.
|
|
* \param handle The handle to the data source.
|
|
* \retval size_t
|
|
* The number of records read.
|
|
*/
|
|
typedef size_t (*FLAC__IOCallback_Read) (void *ptr, size_t size, size_t nmemb, FLAC__IOHandle handle);
|
|
|
|
/** Signature for the write callback.
|
|
* The signature and semantics match POSIX fwrite() implementations
|
|
* and can generally be used interchangeably.
|
|
*
|
|
* \param ptr The address of the write buffer.
|
|
* \param size The size of the records to be written.
|
|
* \param nmemb The number of records to be written.
|
|
* \param handle The handle to the data source.
|
|
* \retval size_t
|
|
* The number of records written.
|
|
*/
|
|
typedef size_t (*FLAC__IOCallback_Write) (const void *ptr, size_t size, size_t nmemb, FLAC__IOHandle handle);
|
|
|
|
/** Signature for the seek callback.
|
|
* The signature and semantics mostly match POSIX fseek() WITH ONE IMPORTANT
|
|
* EXCEPTION: the offset is a 64-bit type whereas fseek() is generally 'long'
|
|
* and 32-bits wide.
|
|
*
|
|
* \param handle The handle to the data source.
|
|
* \param offset The new position, relative to \a whence
|
|
* \param whence \c SEEK_SET, \c SEEK_CUR, or \c SEEK_END
|
|
* \retval int
|
|
* \c 0 on success, \c -1 on error.
|
|
*/
|
|
typedef int (*FLAC__IOCallback_Seek) (FLAC__IOHandle handle, FLAC__int64 offset, int whence);
|
|
|
|
/** Signature for the tell callback.
|
|
* The signature and semantics mostly match POSIX ftell() WITH ONE IMPORTANT
|
|
* EXCEPTION: the offset is a 64-bit type whereas ftell() is generally 'long'
|
|
* and 32-bits wide.
|
|
*
|
|
* \param handle The handle to the data source.
|
|
* \retval FLAC__int64
|
|
* The current position on success, \c -1 on error.
|
|
*/
|
|
typedef FLAC__int64 (*FLAC__IOCallback_Tell) (FLAC__IOHandle handle);
|
|
|
|
/** Signature for the EOF callback.
|
|
* The signature and semantics mostly match POSIX feof() but WATCHOUT:
|
|
* on many systems, feof() is a macro, so in this case a wrapper function
|
|
* must be provided instead.
|
|
*
|
|
* \param handle The handle to the data source.
|
|
* \retval int
|
|
* \c 0 if not at end of file, nonzero if at end of file.
|
|
*/
|
|
typedef int (*FLAC__IOCallback_Eof) (FLAC__IOHandle handle);
|
|
|
|
/** Signature for the close callback.
|
|
* The signature and semantics match POSIX fclose() implementations
|
|
* and can generally be used interchangeably.
|
|
*
|
|
* \param handle The handle to the data source.
|
|
* \retval int
|
|
* \c 0 on success, \c EOF on error.
|
|
*/
|
|
typedef int (*FLAC__IOCallback_Close) (FLAC__IOHandle handle);
|
|
|
|
/** A structure for holding a set of callbacks.
|
|
* Each FLAC interface that requires a FLAC__IOCallbacks structure will
|
|
* describe which of the callbacks are required. The ones that are not
|
|
* required may be set to NULL.
|
|
*
|
|
* If the seek requirement for an interface is optional, you can signify that
|
|
* a data source is not seekable by setting the \a seek field to \c NULL.
|
|
*/
|
|
typedef struct {
|
|
FLAC__IOCallback_Read read;
|
|
FLAC__IOCallback_Write write;
|
|
FLAC__IOCallback_Seek seek;
|
|
FLAC__IOCallback_Tell tell;
|
|
FLAC__IOCallback_Eof eof;
|
|
FLAC__IOCallback_Close close;
|
|
} FLAC__IOCallbacks;
|
|
|
|
/* \} */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|