ref: 8188b4f4f0e07b6669e6ae3c6c1099af917eaab4
dir: /sys/src/cmd/audio/libFLAC/FLAC/metadata.h/
/* libFLAC - Free Lossless Audio Codec library
* Copyright (C) 2001-2009 Josh Coalson
* Copyright (C) 2011-2022 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__METADATA_H
#define FLAC__METADATA_H
#include <sys/types.h> /* for off_t */
#include "export.h"
#include "callback.h"
#include "format.h"
/* --------------------------------------------------------------------
(For an example of how all these routines are used, see the source
code for the unit tests in src/test_libFLAC/metadata_*.c, or
metaflac in src/metaflac/)
------------------------------------------------------------------*/
/** \file include/FLAC/metadata.h
*
* \brief
* This module provides functions for creating and manipulating FLAC
* metadata blocks in memory, and three progressively more powerful
* interfaces for traversing and editing metadata in FLAC files.
*
* See the detailed documentation for each interface in the
* \link flac_metadata metadata \endlink module.
*/
/** \defgroup flac_metadata FLAC/metadata.h: metadata interfaces
* \ingroup flac
*
* \brief
* This module provides functions for creating and manipulating FLAC
* metadata blocks in memory, and three progressively more powerful
* interfaces for traversing and editing metadata in native FLAC files.
* Note that currently only the Chain interface (level 2) supports Ogg
* FLAC files, and it is read-only i.e. no writing back changed
* metadata to file.
*
* There are three metadata interfaces of increasing complexity:
*
* Level 0:
* Read-only access to the STREAMINFO, VORBIS_COMMENT, CUESHEET, and
* PICTURE blocks.
*
* Level 1:
* Read-write access to all metadata blocks. This level is write-
* efficient in most cases (more on this below), and uses less memory
* than level 2.
*
* Level 2:
* Read-write access to all metadata blocks. This level is write-
* efficient in all cases, but uses more memory since all metadata for
* the whole file is read into memory and manipulated before writing
* out again.
*
* What do we mean by efficient? Since FLAC metadata appears at the
* beginning of the file, when writing metadata back to a FLAC file
* it is possible to grow or shrink the metadata such that the entire
* file must be rewritten. However, if the size remains the same during
* changes or PADDING blocks are utilized, only the metadata needs to be
* overwritten, which is much faster.
*
* Efficient means the whole file is rewritten at most one time, and only
* when necessary. Level 1 is not efficient only in the case that you
* cause more than one metadata block to grow or shrink beyond what can
* be accommodated by padding. In this case you should probably use level
* 2, which allows you to edit all the metadata for a file in memory and
* write it out all at once.
*
* All levels know how to skip over and not disturb an ID3v2 tag at the
* front of the file.
*
* All levels access files via their filenames. In addition, level 2
* has additional alternative read and write functions that take an I/O
* handle and callbacks, for situations where access by filename is not
* possible.
*
* In addition to the three interfaces, this module defines functions for
* creating and manipulating various metadata objects in memory. As we see
* from the Format module, FLAC metadata blocks in memory are very primitive
* structures for storing information in an efficient way. Reading
* information from the structures is easy but creating or modifying them
* directly is more complex. The metadata object routines here facilitate
* this by taking care of the consistency and memory management drudgery.
*
* Unless you will be using the level 1 or 2 interfaces to modify existing
* metadata however, you will not probably not need these.
*
* From a dependency standpoint, none of the encoders or decoders require
* the metadata module. This is so that embedded users can strip out the
* metadata module from libFLAC to reduce the size and complexity.
*/
#ifdef __cplusplus
extern "C" {
#endif
/** \defgroup flac_metadata_level0 FLAC/metadata.h: metadata level 0 interface
* \ingroup flac_metadata
*
* \brief
* The level 0 interface consists of individual routines to read the
* STREAMINFO, VORBIS_COMMENT, CUESHEET, and PICTURE blocks, requiring
* only a filename.
*
* On Windows, filename must be a UTF-8 encoded filename, which libFLAC
* internally translates to an appropriate representation to use with
* _wfopen. On all other systems, filename is passed to fopen without
* any translation.
*
* They try to skip any ID3v2 tag at the head of the file.
*
* \{
*/
/** Read the STREAMINFO metadata block of the given FLAC file. This function
* will try to skip any ID3v2 tag at the head of the file.
*
* \param filename The path to the FLAC file to read.
* \param streaminfo A pointer to space for the STREAMINFO block. Since
* FLAC__StreamMetadata is a simple structure with no
* memory allocation involved, you pass the address of
* an existing structure. It need not be initialized.
* \assert
* \code filename != NULL \endcode
* \code streaminfo != NULL \endcode
* \retval FLAC__bool
* \c true if a valid STREAMINFO block was read from \a filename. Returns
* \c false if there was a memory allocation error, a file decoder error,
* or the file contained no STREAMINFO block. (A memory allocation error
* is possible because this function must set up a file decoder.)
*/
FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetadata *streaminfo);
/** Read the VORBIS_COMMENT metadata block of the given FLAC file. This
* function will try to skip any ID3v2 tag at the head of the file.
*
* \param filename The path to the FLAC file to read.
* \param tags The address where the returned pointer will be
* stored. The \a tags object must be deleted by
* the caller using FLAC__metadata_object_delete().
* \assert
* \code filename != NULL \endcode
* \code tags != NULL \endcode
* \retval FLAC__bool
* \c true if a valid VORBIS_COMMENT block was read from \a filename,
* and \a *tags will be set to the address of the metadata structure.
* Returns \c false if there was a memory allocation error, a file
* decoder error, or the file contained no VORBIS_COMMENT block, and
* \a *tags will be set to \c NULL.
*/
FLAC_API FLAC__bool FLAC__metadata_get_tags(const char *filename, FLAC__StreamMetadata **tags);
/** Read the CUESHEET metadata block of the given FLAC file. This
* function will try to skip any ID3v2 tag at the head of the file.
*
* \param filename The path to the FLAC file to read.
* \param cuesheet The address where the returned pointer will be
* stored. The \a cuesheet object must be deleted by
* the caller using FLAC__metadata_object_delete().
* \assert
* \code filename != NULL \endcode
* \code cuesheet != NULL \endcode
* \retval FLAC__bool
* \c true if a valid CUESHEET block was read from \a filename,
* and \a *cuesheet will be set to the address of the metadata
* structure. Returns \c false if there was a memory allocation
* error, a file decoder error, or the file contained no CUESHEET
* block, and \a *cuesheet will be set to \c NULL.
*/
FLAC_API FLAC__bool FLAC__metadata_get_cuesheet(const char *filename, FLAC__StreamMetadata **cuesheet);
/** Read a PICTURE metadata block of the given FLAC file. This
* function will try to skip any ID3v2 tag at the head of the file.
* Since there can be more than one PICTURE block in a file, this
* function takes a number of parameters that act as constraints to
* the search. The PICTURE block with the largest area matching all
* the constraints will be returned, or \a *picture will be set to
* \c NULL if there was no such block.
*
* \param filename The path to the FLAC file to read.
* \param picture The address where the returned pointer will be
* stored. The \a picture object must be deleted by
* the caller using FLAC__metadata_object_delete().
* \param type The desired picture type. Use \c -1 to mean
* "any type".
* \param mime_type The desired MIME type, e.g. "image/jpeg". The
* string will be matched exactly. Use \c NULL to
* mean "any MIME type".
* \param description The desired description. The string will be
* matched exactly. Use \c NULL to mean "any
* description".
* \param max_width The maximum width in pixels desired. Use
* \c (uint32_t)(-1) to mean "any width".
* \param max_height The maximum height in pixels desired. Use
* \c (uint32_t)(-1) to mean "any height".
* \param max_depth The maximum color depth in bits-per-pixel desired.
* Use \c (uint32_t)(-1) to mean "any depth".
* \param max_colors The maximum number of colors desired. Use
* \c (uint32_t)(-1) to mean "any number of colors".
* \assert
* \code filename != NULL \endcode
* \code picture != NULL \endcode
* \retval FLAC__bool
* \c true if a valid PICTURE block was read from \a filename,
* and \a *picture will be set to the address of the metadata
* structure. Returns \c false if there was a memory allocation
* error, a file decoder error, or the file contained no PICTURE
* block, and \a *picture will be set to \c NULL.
*/
FLAC_API FLAC__bool FLAC__metadata_get_picture(const char *filename, FLAC__StreamMetadata **picture, FLAC__StreamMetadata_Picture_Type type, const char *mime_type, const FLAC__byte *description, uint32_t max_width, uint32_t max_height, uint32_t max_depth, uint32_t max_colors);
/* \} */
/** \defgroup flac_metadata_level1 FLAC/metadata.h: metadata level 1 interface
* \ingroup flac_metadata
*
* \brief
* The level 1 interface provides read-write access to FLAC file metadata and
* operates directly on the FLAC file.
*
* The general usage of this interface is:
*
* - Create an iterator using FLAC__metadata_simple_iterator_new()
* - Attach it to a file using FLAC__metadata_simple_iterator_init() and check
* the exit code. Call FLAC__metadata_simple_iterator_is_writable() to
* see if the file is writable, or only read access is allowed.
* - Use FLAC__metadata_simple_iterator_next() and
* FLAC__metadata_simple_iterator_prev() to traverse the blocks.
* This is does not read the actual blocks themselves.
* FLAC__metadata_simple_iterator_next() is relatively fast.
* FLAC__metadata_simple_iterator_prev() is slower since it needs to search
* forward from the front of the file.
* - Use FLAC__metadata_simple_iterator_get_block_type() or
* FLAC__metadata_simple_iterator_get_block() to access the actual data at
* the current iterator position. The returned object is yours to modify
* and free.
* - Use FLAC__metadata_simple_iterator_set_block() to write a modified block
* back. You must have write permission to the original file. Make sure to
* read the whole comment to FLAC__metadata_simple_iterator_set_block()
* below.
* - Use FLAC__metadata_simple_iterator_insert_block_after() to add new blocks.
* Use the object creation functions from
* \link flac_metadata_object here \endlink to generate new objects.
* - Use FLAC__metadata_simple_iterator_delete_block() to remove the block
* currently referred to by the iterator, or replace it with padding.
* - Destroy the iterator with FLAC__metadata_simple_iterator_delete() when
* finished.
*
* \note
* The FLAC file remains open the whole time between
* FLAC__metadata_simple_iterator_init() and
* FLAC__metadata_simple_iterator_delete(), so make sure you are not altering
* the file during this time.
*
* \note
* Do not modify the \a is_last, \a length, or \a type fields of returned
* FLAC__StreamMetadata objects. These are managed automatically.
*
* \note
* If any of the modification functions
* (FLAC__metadata_simple_iterator_set_block(),
* FLAC__metadata_simple_iterator_delete_block(),
* FLAC__metadata_simple_iterator_insert_block_after(), etc.) return \c false,
* you should delete the iterator as it may no longer be valid.
*
* \{
*/
struct FLAC__Metadata_SimpleIterator;
/** The opaque structure definition for the level 1 iterator type.
* See the
* \link flac_metadata_level1 metadata level 1 module \endlink
* for a detailed description.
*/
typedef struct FLAC__Metadata_SimpleIterator FLAC__Metadata_SimpleIterator;
/** Status type for FLAC__Metadata_SimpleIterator.
*
* The iterator's current status can be obtained by calling FLAC__metadata_simple_iterator_status().
*/
typedef enum {
FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK = 0,
/**< The iterator is in the normal OK state */
FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT,
/**< The data passed into a function violated the function's usage criteria */
FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE,
/**< The iterator could not open the target file */
FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE,
/**< The iterator could not find the FLAC signature at the start of the file */
FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE,
/**< The iterator tried to write to a file that was not writable */
FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA,
/**< The iterator encountered input that does not conform to the FLAC metadata specification */
FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR,
/**< The iterator encountered an error while reading the FLAC file */
FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR,
/**< The iterator encountered an error while seeking in the FLAC file */
FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR,
/**< The iterator encountered an error while writing the FLAC file */
FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR,
/**< The iterator encountered an error renaming the FLAC file */
FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR,
/**< The iterator encountered an error removing the temporary file */
FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR,
/**< Memory allocation failed */
FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR
/**< The caller violated an assertion or an unexpected error occurred */
} FLAC__Metadata_SimpleIteratorStatus;
/** Maps a FLAC__Metadata_SimpleIteratorStatus to a C string.
*
* Using a FLAC__Metadata_SimpleIteratorStatus as the index to this array
* will give the string equivalent. The contents should not be modified.
*/
extern FLAC_API const char * const FLAC__Metadata_SimpleIteratorStatusString[];
/** Create a new iterator instance.
*
* \retval FLAC__Metadata_SimpleIterator*
* \c NULL if there was an error allocating memory, else the new instance.
*/
FLAC_API FLAC__Metadata_SimpleIterator *FLAC__metadata_simple_iterator_new(void);
/** Free an iterator instance. Deletes the object pointed to by \a iterator.
*
* \param iterator A pointer to an existing iterator.
* \assert
* \code iterator != NULL \endcode
*/
FLAC_API void FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator *iterator);
/** Get the current status of the iterator. Call this after a function
* returns \c false to get the reason for the error. Also resets the status
* to FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK.
*
* \param iterator A pointer to an existing iterator.
* \assert
* \code iterator != NULL \endcode
* \retval FLAC__Metadata_SimpleIteratorStatus
* The current status of the iterator.
*/
FLAC_API FLAC__Metadata_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator *iterator);
/** Initialize the iterator to point to the first metadata block in the
* given FLAC file.
*
* On Windows, filename must be a UTF-8 encoded filename, which libFLAC
* internally translates to an appropriate representation to use with
* _wfopen. On all other systems, filename is passed to fopen without
* any translation.
*
* \param iterator A pointer to an existing iterator.
* \param filename The path to the FLAC file.
* \param read_only If \c true, the FLAC file will be opened
* in read-only mode; if \c false, the FLAC
* file will be opened for edit even if no
* edits are performed.
* \param preserve_file_stats If \c true, the owner and modification
* time will be preserved even if the FLAC
* file is written to.
* \assert
* \code iterator != NULL \endcode
* \code filename != NULL \endcode
* \retval FLAC__bool
* \c false if a memory allocation error occurs, the file can't be
* opened, or another error occurs, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool read_only, FLAC__bool preserve_file_stats);
/** Returns \c true if the FLAC file is writable. If \c false, calls to
* FLAC__metadata_simple_iterator_set_block() and
* FLAC__metadata_simple_iterator_insert_block_after() will fail.
*
* \param iterator A pointer to an existing iterator.
* \assert
* \code iterator != NULL \endcode
* \retval FLAC__bool
* See above.
*/
FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator *iterator);
/** Moves the iterator forward one metadata block, returning \c false if
* already at the end.
*
* \param iterator A pointer to an existing initialized iterator.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_simple_iterator_init()
* \retval FLAC__bool
* \c false if already at the last metadata block of the chain, else
* \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator *iterator);
/** Moves the iterator backward one metadata block, returning \c false if
* already at the beginning.
*
* \param iterator A pointer to an existing initialized iterator.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_simple_iterator_init()
* \retval FLAC__bool
* \c false if already at the first metadata block of the chain, else
* \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator *iterator);
/** Returns a flag telling if the current metadata block is the last.
*
* \param iterator A pointer to an existing initialized iterator.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_simple_iterator_init()
* \retval FLAC__bool
* \c true if the current metadata block is the last in the file,
* else \c false.
*/
FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_last(const FLAC__Metadata_SimpleIterator *iterator);
/** Get the offset of the metadata block at the current position. This
* avoids reading the actual block data which can save time for large
* blocks.
*
* \param iterator A pointer to an existing initialized iterator.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_simple_iterator_init()
* \retval off_t
* The offset of the metadata block at the current iterator position.
* This is the byte offset relative to the beginning of the file of
* the current metadata block's header.
*/
FLAC_API off_t FLAC__metadata_simple_iterator_get_block_offset(const FLAC__Metadata_SimpleIterator *iterator);
/** Get the type of the metadata block at the current position. This
* avoids reading the actual block data which can save time for large
* blocks.
*
* \param iterator A pointer to an existing initialized iterator.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_simple_iterator_init()
* \retval FLAC__MetadataType
* The type of the metadata block at the current iterator position.
*/
FLAC_API FLAC__MetadataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator *iterator);
/** Get the length of the metadata block at the current position. This
* avoids reading the actual block data which can save time for large
* blocks.
*
* \param iterator A pointer to an existing initialized iterator.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_simple_iterator_init()
* \retval uint32_t
* The length of the metadata block at the current iterator position.
* The is same length as that in the
* <a href="http://xiph.org/flac/format.html#metadata_block_header">metadata block header</a>,
* i.e. the length of the metadata body that follows the header.
*/
FLAC_API uint32_t FLAC__metadata_simple_iterator_get_block_length(const FLAC__Metadata_SimpleIterator *iterator);
/** Get the application ID of the \c APPLICATION block at the current
* position. This avoids reading the actual block data which can save
* time for large blocks.
*
* \param iterator A pointer to an existing initialized iterator.
* \param id A pointer to a buffer of at least \c 4 bytes where
* the ID will be stored.
* \assert
* \code iterator != NULL \endcode
* \code id != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_simple_iterator_init()
* \retval FLAC__bool
* \c true if the ID was successfully read, else \c false, in which
* case you should check FLAC__metadata_simple_iterator_status() to
* find out why. If the status is
* \c FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT, then the
* current metadata block is not an \c APPLICATION block. Otherwise
* if the status is
* \c FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR or
* \c FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR, an I/O error
* occurred and the iterator can no longer be used.
*/
FLAC_API FLAC__bool FLAC__metadata_simple_iterator_get_application_id(FLAC__Metadata_SimpleIterator *iterator, FLAC__byte *id);
/** Get the metadata block at the current position. You can modify the
* block but must use FLAC__metadata_simple_iterator_set_block() to
* write it back to the FLAC file.
*
* You must call FLAC__metadata_object_delete() on the returned object
* when you are finished with it.
*
* \param iterator A pointer to an existing initialized iterator.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_simple_iterator_init()
* \retval FLAC__StreamMetadata*
* The current metadata block, or \c NULL if there was a memory
* allocation error.
*/
FLAC_API FLAC__StreamMetadata *FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator *iterator);
/** Write a block back to the FLAC file. This function tries to be
* as efficient as possible; how the block is actually written is
* shown by the following:
*
* Existing block is a STREAMINFO block and the new block is a
* STREAMINFO block: the new block is written in place. Make sure
* you know what you're doing when changing the values of a
* STREAMINFO block.
*
* Existing block is a STREAMINFO block and the new block is a
* not a STREAMINFO block: this is an error since the first block
* must be a STREAMINFO block. Returns \c false without altering the
* file.
*
* Existing block is not a STREAMINFO block and the new block is a
* STREAMINFO block: this is an error since there may be only one
* STREAMINFO block. Returns \c false without altering the file.
*
* Existing block and new block are the same length: the existing
* block will be replaced by the new block, written in place.
*
* Existing block is longer than new block: if use_padding is \c true,
* the existing block will be overwritten in place with the new
* block followed by a PADDING block, if possible, to make the total
* size the same as the existing block. Remember that a padding
* block requires at least four bytes so if the difference in size
* between the new block and existing block is less than that, the
* entire file will have to be rewritten, using the new block's
* exact size. If use_padding is \c false, the entire file will be
* rewritten, replacing the existing block by the new block.
*
* Existing block is shorter than new block: if use_padding is \c true,
* the function will try and expand the new block into the following
* PADDING block, if it exists and doing so won't shrink the PADDING
* block to less than 4 bytes. If there is no following PADDING
* block, or it will shrink to less than 4 bytes, or use_padding is
* \c false, the entire file is rewritten, replacing the existing block
* with the new block. Note that in this case any following PADDING
* block is preserved as is.
*
* After writing the block, the iterator will remain in the same
* place, i.e. pointing to the new block.
*
* \param iterator A pointer to an existing initialized iterator.
* \param block The block to set.
* \param use_padding See above.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_simple_iterator_init()
* \code block != NULL \endcode
* \retval FLAC__bool
* \c true if successful, else \c false.
*/
FLAC_API FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding);
/** This is similar to FLAC__metadata_simple_iterator_set_block()
* except that instead of writing over an existing block, it appends
* a block after the existing block. \a use_padding is again used to
* tell the function to try an expand into following padding in an
* attempt to avoid rewriting the entire file.
*
* This function will fail and return \c false if given a STREAMINFO
* block.
*
* After writing the block, the iterator will be pointing to the
* new block.
*
* \param iterator A pointer to an existing initialized iterator.
* \param block The block to set.
* \param use_padding See above.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_simple_iterator_init()
* \code block != NULL \endcode
* \retval FLAC__bool
* \c true if successful, else \c false.
*/
FLAC_API FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding);
/** Deletes the block at the current position. This will cause the
* entire FLAC file to be rewritten, unless \a use_padding is \c true,
* in which case the block will be replaced by an equal-sized PADDING
* block. The iterator will be left pointing to the block before the
* one just deleted.
*
* You may not delete the STREAMINFO block.
*
* \param iterator A pointer to an existing initialized iterator.
* \param use_padding See above.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_simple_iterator_init()
* \retval FLAC__bool
* \c true if successful, else \c false.
*/
FLAC_API FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool use_padding);
/* \} */
/** \defgroup flac_metadata_level2 FLAC/metadata.h: metadata level 2 interface
* \ingroup flac_metadata
*
* \brief
* The level 2 interface provides read-write access to FLAC file metadata;
* all metadata is read into memory, operated on in memory, and then written
* to file, which is more efficient than level 1 when editing multiple blocks.
*
* Currently Ogg FLAC is supported for read only, via
* FLAC__metadata_chain_read_ogg() but a subsequent
* FLAC__metadata_chain_write() will fail.
*
* The general usage of this interface is:
*
* - Create a new chain using FLAC__metadata_chain_new(). A chain is a
* linked list of FLAC metadata blocks.
* - Read all metadata into the chain from a FLAC file using
* FLAC__metadata_chain_read() or FLAC__metadata_chain_read_ogg() and
* check the status.
* - Optionally, consolidate the padding using
* FLAC__metadata_chain_merge_padding() or
* FLAC__metadata_chain_sort_padding().
* - Create a new iterator using FLAC__metadata_iterator_new()
* - Initialize the iterator to point to the first element in the chain
* using FLAC__metadata_iterator_init()
* - Traverse the chain using FLAC__metadata_iterator_next and
* FLAC__metadata_iterator_prev().
* - Get a block for reading or modification using
* FLAC__metadata_iterator_get_block(). The pointer to the object
* inside the chain is returned, so the block is yours to modify.
* Changes will be reflected in the FLAC file when you write the
* chain. You can also add and delete blocks (see functions below).
* - When done, write out the chain using FLAC__metadata_chain_write().
* Make sure to read the whole comment to the function below.
* - Delete the chain using FLAC__metadata_chain_delete().
*
* \note
* Even though the FLAC file is not open while the chain is being
* manipulated, you must not alter the file externally during
* this time. The chain assumes the FLAC file will not change
* between the time of FLAC__metadata_chain_read()/FLAC__metadata_chain_read_ogg()
* and FLAC__metadata_chain_write().
*
* \note
* Do not modify the is_last, length, or type fields of returned
* FLAC__StreamMetadata objects. These are managed automatically.
*
* \note
* The metadata objects returned by FLAC__metadata_iterator_get_block()
* are owned by the chain; do not FLAC__metadata_object_delete() them.
* In the same way, blocks passed to FLAC__metadata_iterator_set_block()
* become owned by the chain and they will be deleted when the chain is
* deleted.
*
* \{
*/
struct FLAC__Metadata_Chain;
/** The opaque structure definition for the level 2 chain type.
*/
typedef struct FLAC__Metadata_Chain FLAC__Metadata_Chain;
struct FLAC__Metadata_Iterator;
/** The opaque structure definition for the level 2 iterator type.
*/
typedef struct FLAC__Metadata_Iterator FLAC__Metadata_Iterator;
typedef enum {
FLAC__METADATA_CHAIN_STATUS_OK = 0,
/**< The chain is in the normal OK state */
FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT,
/**< The data passed into a function violated the function's usage criteria */
FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE,
/**< The chain could not open the target file */
FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE,
/**< The chain could not find the FLAC signature at the start of the file */
FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE,
/**< The chain tried to write to a file that was not writable */
FLAC__METADATA_CHAIN_STATUS_BAD_METADATA,
/**< The chain encountered input that does not conform to the FLAC metadata specification */
FLAC__METADATA_CHAIN_STATUS_READ_ERROR,
/**< The chain encountered an error while reading the FLAC file */
FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR,
/**< The chain encountered an error while seeking in the FLAC file */
FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR,
/**< The chain encountered an error while writing the FLAC file */
FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR,
/**< The chain encountered an error renaming the FLAC file */
FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR,
/**< The chain encountered an error removing the temporary file */
FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR,
/**< Memory allocation failed */
FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR,
/**< The caller violated an assertion or an unexpected error occurred */
FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS,
/**< One or more of the required callbacks was NULL */
FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH,
/**< FLAC__metadata_chain_write() was called on a chain read by
* FLAC__metadata_chain_read_with_callbacks()/FLAC__metadata_chain_read_ogg_with_callbacks(),
* or
* FLAC__metadata_chain_write_with_callbacks()/FLAC__metadata_chain_write_with_callbacks_and_tempfile()
* was called on a chain read by
* FLAC__metadata_chain_read()/FLAC__metadata_chain_read_ogg().
* Matching read/write methods must always be used. */
FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL
/**< FLAC__metadata_chain_write_with_callbacks() was called when the
* chain write requires a tempfile; use
* FLAC__metadata_chain_write_with_callbacks_and_tempfile() instead.
* Or, FLAC__metadata_chain_write_with_callbacks_and_tempfile() was
* called when the chain write does not require a tempfile; use
* FLAC__metadata_chain_write_with_callbacks() instead.
* Always check FLAC__metadata_chain_check_if_tempfile_needed()
* before writing via callbacks. */
} FLAC__Metadata_ChainStatus;
/** Maps a FLAC__Metadata_ChainStatus to a C string.
*
* Using a FLAC__Metadata_ChainStatus as the index to this array
* will give the string equivalent. The contents should not be modified.
*/
extern FLAC_API const char * const FLAC__Metadata_ChainStatusString[];
/*********** FLAC__Metadata_Chain ***********/
/** Create a new chain instance.
*
* \retval FLAC__Metadata_Chain*
* \c NULL if there was an error allocating memory, else the new instance.
*/
FLAC_API FLAC__Metadata_Chain *FLAC__metadata_chain_new(void);
/** Free a chain instance. Deletes the object pointed to by \a chain.
*
* \param chain A pointer to an existing chain.
* \assert
* \code chain != NULL \endcode
*/
FLAC_API void FLAC__metadata_chain_delete(FLAC__Metadata_Chain *chain);
/** Get the current status of the chain. Call this after a function
* returns \c false to get the reason for the error. Also resets the
* status to FLAC__METADATA_CHAIN_STATUS_OK.
*
* \param chain A pointer to an existing chain.
* \assert
* \code chain != NULL \endcode
* \retval FLAC__Metadata_ChainStatus
* The current status of the chain.
*/
FLAC_API FLAC__Metadata_ChainStatus FLAC__metadata_chain_status(FLAC__Metadata_Chain *chain);
/** Read all metadata from a FLAC file into the chain.
*
* On Windows, filename must be a UTF-8 encoded filename, which libFLAC
* internally translates to an appropriate representation to use with
* _wfopen. On all other systems, filename is passed to fopen without
* any translation.
*
* \param chain A pointer to an existing chain.
* \param filename The path to the FLAC file to read.
* \assert
* \code chain != NULL \endcode
* \code filename != NULL \endcode
* \retval FLAC__bool
* \c true if a valid list of metadata blocks was read from
* \a filename, else \c false. On failure, check the status with
* FLAC__metadata_chain_status().
*/
FLAC_API FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *filename);
/** Read all metadata from an Ogg FLAC file into the chain.
*
* On Windows, filename must be a UTF-8 encoded filename, which libFLAC
* internally translates to an appropriate representation to use with
* _wfopen. On all other systems, filename is passed to fopen without
* any translation.
*
* \note Ogg FLAC metadata data writing is not supported yet and
* FLAC__metadata_chain_write() will fail.
*
* \param chain A pointer to an existing chain.
* \param filename The path to the Ogg FLAC file to read.
* \assert
* \code chain != NULL \endcode
* \code filename != NULL \endcode
* \retval FLAC__bool
* \c true if a valid list of metadata blocks was read from
* \a filename, else \c false. On failure, check the status with
* FLAC__metadata_chain_status().
*/
FLAC_API FLAC__bool FLAC__metadata_chain_read_ogg(FLAC__Metadata_Chain *chain, const char *filename);
/** Read all metadata from a FLAC stream into the chain via I/O callbacks.
*
* The \a handle need only be open for reading, but must be seekable.
* The equivalent minimum stdio fopen() file mode is \c "r" (or \c "rb"
* for Windows).
*
* \param chain A pointer to an existing chain.
* \param handle The I/O handle of the FLAC stream to read. The
* handle will NOT be closed after the metadata is read;
* that is the duty of the caller.
* \param callbacks
* A set of callbacks to use for I/O. The mandatory
* callbacks are \a read, \a seek, and \a tell.
* \assert
* \code chain != NULL \endcode
* \retval FLAC__bool
* \c true if a valid list of metadata blocks was read from
* \a handle, else \c false. On failure, check the status with
* FLAC__metadata_chain_status().
*/
FLAC_API FLAC__bool FLAC__metadata_chain_read_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks);
/** Read all metadata from an Ogg FLAC stream into the chain via I/O callbacks.
*
* The \a handle need only be open for reading, but must be seekable.
* The equivalent minimum stdio fopen() file mode is \c "r" (or \c "rb"
* for Windows).
*
* \note Ogg FLAC metadata data writing is not supported yet and
* FLAC__metadata_chain_write() will fail.
*
* \param chain A pointer to an existing chain.
* \param handle The I/O handle of the Ogg FLAC stream to read. The
* handle will NOT be closed after the metadata is read;
* that is the duty of the caller.
* \param callbacks
* A set of callbacks to use for I/O. The mandatory
* callbacks are \a read, \a seek, and \a tell.
* \assert
* \code chain != NULL \endcode
* \retval FLAC__bool
* \c true if a valid list of metadata blocks was read from
* \a handle, else \c false. On failure, check the status with
* FLAC__metadata_chain_status().
*/
FLAC_API FLAC__bool FLAC__metadata_chain_read_ogg_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks);
/** Checks if writing the given chain would require the use of a
* temporary file, or if it could be written in place.
*
* Under certain conditions, padding can be utilized so that writing
* edited metadata back to the FLAC file does not require rewriting the
* entire file. If rewriting is required, then a temporary workfile is
* required. When writing metadata using callbacks, you must check
* this function to know whether to call
* FLAC__metadata_chain_write_with_callbacks() or
* FLAC__metadata_chain_write_with_callbacks_and_tempfile(). When
* writing with FLAC__metadata_chain_write(), the temporary file is
* handled internally.
*
* \param chain A pointer to an existing chain.
* \param use_padding
* Whether or not padding will be allowed to be used
* during the write. The value of \a use_padding given
* here must match the value later passed to
* FLAC__metadata_chain_write_with_callbacks() or
* FLAC__metadata_chain_write_with_callbacks_with_tempfile().
* \assert
* \code chain != NULL \endcode
* \retval FLAC__bool
* \c true if writing the current chain would require a tempfile, or
* \c false if metadata can be written in place.
*/
FLAC_API FLAC__bool FLAC__metadata_chain_check_if_tempfile_needed(FLAC__Metadata_Chain *chain, FLAC__bool use_padding);
/** Write all metadata out to the FLAC file. This function tries to be as
* efficient as possible; how the metadata is actually written is shown by
* the following:
*
* If the current chain is the same size as the existing metadata, the new
* data is written in place.
*
* If the current chain is longer than the existing metadata, and
* \a use_padding is \c true, and the last block is a PADDING block of
* sufficient length, the function will truncate the final padding block
* so that the overall size of the metadata is the same as the existing
* metadata, and then just rewrite the metadata. Otherwise, if not all of
* the above conditions are met, the entire FLAC file must be rewritten.
* If you want to use padding this way it is a good idea to call
* FLAC__metadata_chain_sort_padding() first so that you have the maximum
* amount of padding to work with, unless you need to preserve ordering
* of the PADDING blocks for some reason.
*
* If the current chain is shorter than the existing metadata, and
* \a use_padding is \c true, and the final block is a PADDING block, the padding
* is extended to make the overall size the same as the existing data. If
* \a use_padding is \c true and the last block is not a PADDING block, a new
* PADDING block is added to the end of the new data to make it the same
* size as the existing data (if possible, see the note to
* FLAC__metadata_simple_iterator_set_block() about the four byte limit)
* and the new data is written in place. If none of the above apply or
* \a use_padding is \c false, the entire FLAC file is rewritten.
*
* If \a preserve_file_stats is \c true, the owner and modification time will
* be preserved even if the FLAC file is written.
*
* For this write function to be used, the chain must have been read with
* FLAC__metadata_chain_read()/FLAC__metadata_chain_read_ogg(), not
* FLAC__metadata_chain_read_with_callbacks()/FLAC__metadata_chain_read_ogg_with_callbacks().
*
* \param chain A pointer to an existing chain.
* \param use_padding See above.
* \param preserve_file_stats See above.
* \assert
* \code chain != NULL \endcode
* \retval FLAC__bool
* \c true if the write succeeded, else \c false. On failure,
* check the status with FLAC__metadata_chain_status().
*/
FLAC_API FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats);
/** Write all metadata out to a FLAC stream via callbacks.
*
* (See FLAC__metadata_chain_write() for the details on how padding is
* used to write metadata in place if possible.)
*
* The \a handle must be open for updating and be seekable. The
* equivalent minimum stdio fopen() file mode is \c "r+" (or \c "r+b"
* for Windows).
*
* For this write function to be used, the chain must have been read with
* FLAC__metadata_chain_read_with_callbacks()/FLAC__metadata_chain_read_ogg_with_callbacks(),
* not FLAC__metadata_chain_read()/FLAC__metadata_chain_read_ogg().
* Also, FLAC__metadata_chain_check_if_tempfile_needed() must have returned
* \c false.
*
* \param chain A pointer to an existing chain.
* \param use_padding See FLAC__metadata_chain_write()
* \param handle The I/O handle of the FLAC stream to write. The
* handle will NOT be closed after the metadata is
* written; that is the duty of the caller.
* \param callbacks A set of callbacks to use for I/O. The mandatory
* callbacks are \a write and \a seek.
* \assert
* \code chain != NULL \endcode
* \retval FLAC__bool
* \c true if the write succeeded, else \c false. On failure,
* check the status with FLAC__metadata_chain_status().
*/
FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks);
/** Write all metadata out to a FLAC stream via callbacks.
*
* (See FLAC__metadata_chain_write() for the details on how padding is
* used to write metadata in place if possible.)
*
* This version of the write-with-callbacks function must be used when
* FLAC__metadata_chain_check_if_tempfile_needed() returns true. In
* this function, you must supply an I/O handle corresponding to the
* FLAC file to edit, and a temporary handle to which the new FLAC
* file will be written. It is the caller's job to move this temporary
* FLAC file on top of the original FLAC file to complete the metadata
* edit.
*
* The \a handle must be open for reading and be seekable. The
* equivalent minimum stdio fopen() file mode is \c "r" (or \c "rb"
* for Windows).
*
* The \a temp_handle must be open for writing. The
* equivalent minimum stdio fopen() file mode is \c "w" (or \c "wb"
* for Windows). It should be an empty stream, or at least positioned
* at the start-of-file (in which case it is the caller's duty to
* truncate it on return).
*
* For this write function to be used, the chain must have been read with
* FLAC__metadata_chain_read_with_callbacks()/FLAC__metadata_chain_read_ogg_with_callbacks(),
* not FLAC__metadata_chain_read()/FLAC__metadata_chain_read_ogg().
* Also, FLAC__metadata_chain_check_if_tempfile_needed() must have returned
* \c true.
*
* \param chain A pointer to an existing chain.
* \param use_padding See FLAC__metadata_chain_write()
* \param handle The I/O handle of the original FLAC stream to read.
* The handle will NOT be closed after the metadata is
* written; that is the duty of the caller.
* \param callbacks A set of callbacks to use for I/O on \a handle.
* The mandatory callbacks are \a read, \a seek, and
* \a eof.
* \param temp_handle The I/O handle of the FLAC stream to write. The
* handle will NOT be closed after the metadata is
* written; that is the duty of the caller.
* \param temp_callbacks
* A set of callbacks to use for I/O on temp_handle.
* The only mandatory callback is \a write.
* \assert
* \code chain != NULL \endcode
* \retval FLAC__bool
* \c true if the write succeeded, else \c false. On failure,
* check the status with FLAC__metadata_chain_status().
*/
FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks_and_tempfile(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks, FLAC__IOHandle temp_handle, FLAC__IOCallbacks temp_callbacks);
/** Merge adjacent PADDING blocks into a single block.
*
* \note This function does not write to the FLAC file, it only
* modifies the chain.
*
* \warning Any iterator on the current chain will become invalid after this
* call. You should delete the iterator and get a new one.
*
* \param chain A pointer to an existing chain.
* \assert
* \code chain != NULL \endcode
*/
FLAC_API void FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain *chain);
/** This function will move all PADDING blocks to the end on the metadata,
* then merge them into a single block.
*
* \note This function does not write to the FLAC file, it only
* modifies the chain.
*
* \warning Any iterator on the current chain will become invalid after this
* call. You should delete the iterator and get a new one.
*
* \param chain A pointer to an existing chain.
* \assert
* \code chain != NULL \endcode
*/
FLAC_API void FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain *chain);
/*********** FLAC__Metadata_Iterator ***********/
/** Create a new iterator instance.
*
* \retval FLAC__Metadata_Iterator*
* \c NULL if there was an error allocating memory, else the new instance.
*/
FLAC_API FLAC__Metadata_Iterator *FLAC__metadata_iterator_new(void);
/** Free an iterator instance. Deletes the object pointed to by \a iterator.
*
* \param iterator A pointer to an existing iterator.
* \assert
* \code iterator != NULL \endcode
*/
FLAC_API void FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator *iterator);
/** Initialize the iterator to point to the first metadata block in the
* given chain.
*
* \param iterator A pointer to an existing iterator.
* \param chain A pointer to an existing and initialized (read) chain.
* \assert
* \code iterator != NULL \endcode
* \code chain != NULL \endcode
*/
FLAC_API void FLAC__metadata_iterator_init(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Chain *chain);
/** Moves the iterator forward one metadata block, returning \c false if
* already at the end.
*
* \param iterator A pointer to an existing initialized iterator.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_iterator_init()
* \retval FLAC__bool
* \c false if already at the last metadata block of the chain, else
* \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_iterator_next(FLAC__Metadata_Iterator *iterator);
/** Moves the iterator backward one metadata block, returning \c false if
* already at the beginning.
*
* \param iterator A pointer to an existing initialized iterator.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_iterator_init()
* \retval FLAC__bool
* \c false if already at the first metadata block of the chain, else
* \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator *iterator);
/** Get the type of the metadata block at the current position.
*
* \param iterator A pointer to an existing initialized iterator.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_iterator_init()
* \retval FLAC__MetadataType
* The type of the metadata block at the current iterator position.
*/
FLAC_API FLAC__MetadataType FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator *iterator);
/** Get the metadata block at the current position. You can modify
* the block in place but must write the chain before the changes
* are reflected to the FLAC file. You do not need to call
* FLAC__metadata_iterator_set_block() to reflect the changes;
* the pointer returned by FLAC__metadata_iterator_get_block()
* points directly into the chain.
*
* \warning
* Do not call FLAC__metadata_object_delete() on the returned object;
* to delete a block use FLAC__metadata_iterator_delete_block().
*
* \param iterator A pointer to an existing initialized iterator.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_iterator_init()
* \retval FLAC__StreamMetadata*
* The current metadata block.
*/
FLAC_API FLAC__StreamMetadata *FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator *iterator);
/** Set the metadata block at the current position, replacing the existing
* block. The new block passed in becomes owned by the chain and it will be
* deleted when the chain is deleted.
*
* \param iterator A pointer to an existing initialized iterator.
* \param block A pointer to a metadata block.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_iterator_init()
* \code block != NULL \endcode
* \retval FLAC__bool
* \c false if the conditions in the above description are not met, or
* a memory allocation error occurs, otherwise \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block);
/** Removes the current block from the chain. If \a replace_with_padding is
* \c true, the block will instead be replaced with a padding block of equal
* size. You can not delete the STREAMINFO block. The iterator will be
* left pointing to the block before the one just "deleted", even if
* \a replace_with_padding is \c true.
*
* \param iterator A pointer to an existing initialized iterator.
* \param replace_with_padding See above.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_iterator_init()
* \retval FLAC__bool
* \c false if the conditions in the above description are not met,
* otherwise \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator *iterator, FLAC__bool replace_with_padding);
/** Insert a new block before the current block. You cannot insert a block
* before the first STREAMINFO block. You cannot insert a STREAMINFO block
* as there can be only one, the one that already exists at the head when you
* read in a chain. The chain takes ownership of the new block and it will be
* deleted when the chain is deleted. The iterator will be left pointing to
* the new block.
*
* \param iterator A pointer to an existing initialized iterator.
* \param block A pointer to a metadata block to insert.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_iterator_init()
* \retval FLAC__bool
* \c false if the conditions in the above description are not met, or
* a memory allocation error occurs, otherwise \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block);
/** Insert a new block after the current block. You cannot insert a STREAMINFO
* block as there can be only one, the one that already exists at the head when
* you read in a chain. The chain takes ownership of the new block and it will
* be deleted when the chain is deleted. The iterator will be left pointing to
* the new block.
*
* \param iterator A pointer to an existing initialized iterator.
* \param block A pointer to a metadata block to insert.
* \assert
* \code iterator != NULL \endcode
* \a iterator has been successfully initialized with
* FLAC__metadata_iterator_init()
* \retval FLAC__bool
* \c false if the conditions in the above description are not met, or
* a memory allocation error occurs, otherwise \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block);
/* \} */
/** \defgroup flac_metadata_object FLAC/metadata.h: metadata object methods
* \ingroup flac_metadata
*
* \brief
* This module contains methods for manipulating FLAC metadata objects.
*
* Since many are variable length we have to be careful about the memory
* management. We decree that all pointers to data in the object are
* owned by the object and memory-managed by the object.
*
* Use the FLAC__metadata_object_new() and FLAC__metadata_object_delete()
* functions to create all instances. When using the
* FLAC__metadata_object_set_*() functions to set pointers to data, set
* \a copy to \c true to have the function make it's own copy of the data, or
* to \c false to give the object ownership of your data. In the latter case
* your pointer must be freeable by free() and will be free()d when the object
* is FLAC__metadata_object_delete()d. It is legal to pass a null pointer as
* the data pointer to a FLAC__metadata_object_set_*() function as long as
* the length argument is 0 and the \a copy argument is \c false.
*
* The FLAC__metadata_object_new() and FLAC__metadata_object_clone() function
* will return \c NULL in the case of a memory allocation error, otherwise a new
* object. The FLAC__metadata_object_set_*() functions return \c false in the
* case of a memory allocation error.
*
* We don't have the convenience of C++ here, so note that the library relies
* on you to keep the types straight. In other words, if you pass, for
* example, a FLAC__StreamMetadata* that represents a STREAMINFO block to
* FLAC__metadata_object_application_set_data(), you will get an assertion
* failure.
*
* For convenience the FLAC__metadata_object_vorbiscomment_*() functions
* maintain a trailing NUL on each Vorbis comment entry. This is not counted
* toward the length or stored in the stream, but it can make working with plain
* comments (those that don't contain embedded-NULs in the value) easier.
* Entries passed into these functions have trailing NULs added if missing, and
* returned entries are guaranteed to have a trailing NUL.
*
* The FLAC__metadata_object_vorbiscomment_*() functions that take a Vorbis
* comment entry/name/value will first validate that it complies with the Vorbis
* comment specification and return false if it does not.
*
* There is no need to recalculate the length field on metadata blocks you
* have modified. They will be calculated automatically before they are
* written back to a file.
*
* \{
*/
/** Create a new metadata object instance of the given type.
*
* The object will be "empty"; i.e. values and data pointers will be \c 0,
* with the exception of FLAC__METADATA_TYPE_VORBIS_COMMENT, which will have
* the vendor string set (but zero comments).
*
* Do not pass in a value greater than or equal to
* \a FLAC__METADATA_TYPE_UNDEFINED unless you really know what you're
* doing.
*
* \param type Type of object to create
* \retval FLAC__StreamMetadata*
* \c NULL if there was an error allocating memory or the type code is
* greater than FLAC__MAX_METADATA_TYPE_CODE, else the new instance.
*/
FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_new(FLAC__MetadataType type);
/** Create a copy of an existing metadata object.
*
* The copy is a "deep" copy, i.e. dynamically allocated data within the
* object is also copied. The caller takes ownership of the new block and
* is responsible for freeing it with FLAC__metadata_object_delete().
*
* \param object Pointer to object to copy.
* \assert
* \code object != NULL \endcode
* \retval FLAC__StreamMetadata*
* \c NULL if there was an error allocating memory, else the new instance.
*/
FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_clone(const FLAC__StreamMetadata *object);
/** Free a metadata object. Deletes the object pointed to by \a object.
*
* The delete is a "deep" delete, i.e. dynamically allocated data within the
* object is also deleted.
*
* \param object A pointer to an existing object.
* \assert
* \code object != NULL \endcode
*/
FLAC_API void FLAC__metadata_object_delete(FLAC__StreamMetadata *object);
/** Compares two metadata objects.
*
* The compare is "deep", i.e. dynamically allocated data within the
* object is also compared.
*
* \param block1 A pointer to an existing object.
* \param block2 A pointer to an existing object.
* \assert
* \code block1 != NULL \endcode
* \code block2 != NULL \endcode
* \retval FLAC__bool
* \c true if objects are identical, else \c false.
*/
FLAC_API FLAC__bool FLAC__metadata_object_is_equal(const FLAC__StreamMetadata *block1, const FLAC__StreamMetadata *block2);
/** Sets the application data of an APPLICATION block.
*
* If \a copy is \c true, a copy of the data is stored; otherwise, the object
* takes ownership of the pointer. The existing data will be freed if this
* function is successful, otherwise the original data will remain if \a copy
* is \c true and malloc() fails.
*
* \note It is safe to pass a const pointer to \a data if \a copy is \c true.
*
* \param object A pointer to an existing APPLICATION object.
* \param data A pointer to the data to set.
* \param length The length of \a data in bytes.
* \param copy See above.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_APPLICATION \endcode
* \code (data != NULL && length > 0) ||
* (data == NULL && length == 0 && copy == false) \endcode
* \retval FLAC__bool
* \c false if \a copy is \c true and malloc() fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_application_set_data(FLAC__StreamMetadata *object, FLAC__byte *data, uint32_t length, FLAC__bool copy);
/** Resize the seekpoint array.
*
* If the size shrinks, elements will truncated; if it grows, new placeholder
* points will be added to the end. If this function returns false, the
* object is left untouched.
*
* \param object A pointer to an existing SEEKTABLE object.
* \param new_num_points The desired length of the array; may be \c 0.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
* \code (object->data.seek_table.points == NULL && object->data.seek_table.num_points == 0) ||
* (object->data.seek_table.points != NULL && object->data.seek_table.num_points > 0) \endcode
* \retval FLAC__bool
* \c false if memory allocation error, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_seektable_resize_points(FLAC__StreamMetadata *object, uint32_t new_num_points);
/** Set a seekpoint in a seektable.
*
* \param object A pointer to an existing SEEKTABLE object.
* \param point_num Index into seekpoint array to set.
* \param point The point to set.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
* \code object->data.seek_table.num_points > point_num \endcode
*/
FLAC_API void FLAC__metadata_object_seektable_set_point(FLAC__StreamMetadata *object, uint32_t point_num, FLAC__StreamMetadata_SeekPoint point);
/** Insert a seekpoint into a seektable.
*
* \param object A pointer to an existing SEEKTABLE object.
* \param point_num Index into seekpoint array to set.
* \param point The point to set.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
* \code object->data.seek_table.num_points >= point_num \endcode
* \retval FLAC__bool
* \c false if memory allocation error, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_seektable_insert_point(FLAC__StreamMetadata *object, uint32_t point_num, FLAC__StreamMetadata_SeekPoint point);
/** Delete a seekpoint from a seektable.
*
* \param object A pointer to an existing SEEKTABLE object.
* \param point_num Index into seekpoint array to set.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
* \code object->data.seek_table.num_points > point_num \endcode
* \retval FLAC__bool
* \c false if memory allocation error, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_seektable_delete_point(FLAC__StreamMetadata *object, uint32_t point_num);
/** Check a seektable to see if it conforms to the FLAC specification.
* See the format specification for limits on the contents of the
* seektable.
*
* \param object A pointer to an existing SEEKTABLE object.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
* \retval FLAC__bool
* \c false if seek table is illegal, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_seektable_is_legal(const FLAC__StreamMetadata *object);
/** Append a number of placeholder points to the end of a seek table.
*
* \note
* As with the other ..._seektable_template_... functions, you should
* call FLAC__metadata_object_seektable_template_sort() when finished
* to make the seek table legal.
*
* \param object A pointer to an existing SEEKTABLE object.
* \param num The number of placeholder points to append.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
* \retval FLAC__bool
* \c false if memory allocation fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_placeholders(FLAC__StreamMetadata *object, uint32_t num);
/** Append a specific seek point template to the end of a seek table.
*
* \note
* As with the other ..._seektable_template_... functions, you should
* call FLAC__metadata_object_seektable_template_sort() when finished
* to make the seek table legal.
*
* \param object A pointer to an existing SEEKTABLE object.
* \param sample_number The sample number of the seek point template.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
* \retval FLAC__bool
* \c false if memory allocation fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_point(FLAC__StreamMetadata *object, FLAC__uint64 sample_number);
/** Append specific seek point templates to the end of a seek table.
*
* \note
* As with the other ..._seektable_template_... functions, you should
* call FLAC__metadata_object_seektable_template_sort() when finished
* to make the seek table legal.
*
* \param object A pointer to an existing SEEKTABLE object.
* \param sample_numbers An array of sample numbers for the seek points.
* \param num The number of seek point templates to append.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
* \retval FLAC__bool
* \c false if memory allocation fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_points(FLAC__StreamMetadata *object, FLAC__uint64 sample_numbers[], uint32_t num);
/** Append a set of evenly-spaced seek point templates to the end of a
* seek table.
*
* \note
* As with the other ..._seektable_template_... functions, you should
* call FLAC__metadata_object_seektable_template_sort() when finished
* to make the seek table legal.
*
* \param object A pointer to an existing SEEKTABLE object.
* \param num The number of placeholder points to append.
* \param total_samples The total number of samples to be encoded;
* the seekpoints will be spaced approximately
* \a total_samples / \a num samples apart.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
* \code total_samples > 0 \endcode
* \retval FLAC__bool
* \c false if memory allocation fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_spaced_points(FLAC__StreamMetadata *object, uint32_t num, FLAC__uint64 total_samples);
/** Append a set of evenly-spaced seek point templates to the end of a
* seek table.
*
* \note
* As with the other ..._seektable_template_... functions, you should
* call FLAC__metadata_object_seektable_template_sort() when finished
* to make the seek table legal.
*
* \param object A pointer to an existing SEEKTABLE object.
* \param samples The number of samples apart to space the placeholder
* points. The first point will be at sample \c 0, the
* second at sample \a samples, then 2*\a samples, and
* so on. As long as \a samples and \a total_samples
* are greater than \c 0, there will always be at least
* one seekpoint at sample \c 0.
* \param total_samples The total number of samples to be encoded;
* the seekpoints will be spaced
* \a samples samples apart.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
* \code samples > 0 \endcode
* \code total_samples > 0 \endcode
* \retval FLAC__bool
* \c false if memory allocation fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(FLAC__StreamMetadata *object, uint32_t samples, FLAC__uint64 total_samples);
/** Sort a seek table's seek points according to the format specification,
* removing duplicates.
*
* \param object A pointer to a seek table to be sorted.
* \param compact If \c false, behaves like FLAC__format_seektable_sort().
* If \c true, duplicates are deleted and the seek table is
* shrunk appropriately; the number of placeholder points
* present in the seek table will be the same after the call
* as before.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
* \retval FLAC__bool
* \c false if realloc() fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_sort(FLAC__StreamMetadata *object, FLAC__bool compact);
/** Sets the vendor string in a VORBIS_COMMENT block.
*
* For convenience, a trailing NUL is added to the entry if it doesn't have
* one already.
*
* If \a copy is \c true, a copy of the entry is stored; otherwise, the object
* takes ownership of the \c entry.entry pointer.
*
* \note If this function returns \c false, the caller still owns the
* pointer.
*
* \param object A pointer to an existing VORBIS_COMMENT object.
* \param entry The entry to set the vendor string to.
* \param copy See above.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
* \code (entry.entry != NULL && entry.length > 0) ||
* (entry.entry == NULL && entry.length == 0) \endcode
* \retval FLAC__bool
* \c false if memory allocation fails or \a entry does not comply with the
* Vorbis comment specification, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_vendor_string(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy);
/** Resize the comment array.
*
* If the size shrinks, elements will truncated; if it grows, new empty
* fields will be added to the end. If this function returns false, the
* object is left untouched.
*
* \param object A pointer to an existing VORBIS_COMMENT object.
* \param new_num_comments The desired length of the array; may be \c 0.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
* \code (object->data.vorbis_comment.comments == NULL && object->data.vorbis_comment.num_comments == 0) ||
* (object->data.vorbis_comment.comments != NULL && object->data.vorbis_comment.num_comments > 0) \endcode
* \retval FLAC__bool
* \c false if memory allocation fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_resize_comments(FLAC__StreamMetadata *object, uint32_t new_num_comments);
/** Sets a comment in a VORBIS_COMMENT block.
*
* For convenience, a trailing NUL is added to the entry if it doesn't have
* one already.
*
* If \a copy is \c true, a copy of the entry is stored; otherwise, the object
* takes ownership of the \c entry.entry pointer.
*
* \note If this function returns \c false, the caller still owns the
* pointer.
*
* \param object A pointer to an existing VORBIS_COMMENT object.
* \param comment_num Index into comment array to set.
* \param entry The entry to set the comment to.
* \param copy See above.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
* \code comment_num < object->data.vorbis_comment.num_comments \endcode
* \code (entry.entry != NULL && entry.length > 0) ||
* (entry.entry == NULL && entry.length == 0) \endcode
* \retval FLAC__bool
* \c false if memory allocation fails or \a entry does not comply with the
* Vorbis comment specification, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_comment(FLAC__StreamMetadata *object, uint32_t comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy);
/** Insert a comment in a VORBIS_COMMENT block at the given index.
*
* For convenience, a trailing NUL is added to the entry if it doesn't have
* one already.
*
* If \a copy is \c true, a copy of the entry is stored; otherwise, the object
* takes ownership of the \c entry.entry pointer.
*
* \note If this function returns \c false, the caller still owns the
* pointer.
*
* \param object A pointer to an existing VORBIS_COMMENT object.
* \param comment_num The index at which to insert the comment. The comments
* at and after \a comment_num move right one position.
* To append a comment to the end, set \a comment_num to
* \c object->data.vorbis_comment.num_comments .
* \param entry The comment to insert.
* \param copy See above.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
* \code object->data.vorbis_comment.num_comments >= comment_num \endcode
* \code (entry.entry != NULL && entry.length > 0) ||
* (entry.entry == NULL && entry.length == 0 && copy == false) \endcode
* \retval FLAC__bool
* \c false if memory allocation fails or \a entry does not comply with the
* Vorbis comment specification, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_insert_comment(FLAC__StreamMetadata *object, uint32_t comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy);
/** Appends a comment to a VORBIS_COMMENT block.
*
* For convenience, a trailing NUL is added to the entry if it doesn't have
* one already.
*
* If \a copy is \c true, a copy of the entry is stored; otherwise, the object
* takes ownership of the \c entry.entry pointer.
*
* \note If this function returns \c false, the caller still owns the
* pointer.
*
* \param object A pointer to an existing VORBIS_COMMENT object.
* \param entry The comment to insert.
* \param copy See above.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
* \code (entry.entry != NULL && entry.length > 0) ||
* (entry.entry == NULL && entry.length == 0 && copy == false) \endcode
* \retval FLAC__bool
* \c false if memory allocation fails or \a entry does not comply with the
* Vorbis comment specification, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_append_comment(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy);
/** Replaces comments in a VORBIS_COMMENT block with a new one.
*
* For convenience, a trailing NUL is added to the entry if it doesn't have
* one already.
*
* Depending on the value of \a all, either all or just the first comment
* whose field name(s) match the given entry's name will be replaced by the
* given entry. If no comments match, \a entry will simply be appended.
*
* If \a copy is \c true, a copy of the entry is stored; otherwise, the object
* takes ownership of the \c entry.entry pointer.
*
* \note If this function returns \c false, the caller still owns the
* pointer.
*
* \param object A pointer to an existing VORBIS_COMMENT object.
* \param entry The comment to insert.
* \param all If \c true, all comments whose field name matches
* \a entry's field name will be removed, and \a entry will
* be inserted at the position of the first matching
* comment. If \c false, only the first comment whose
* field name matches \a entry's field name will be
* replaced with \a entry.
* \param copy See above.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
* \code (entry.entry != NULL && entry.length > 0) ||
* (entry.entry == NULL && entry.length == 0 && copy == false) \endcode
* \retval FLAC__bool
* \c false if memory allocation fails or \a entry does not comply with the
* Vorbis comment specification, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_replace_comment(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool all, FLAC__bool copy);
/** Delete a comment in a VORBIS_COMMENT block at the given index.
*
* \param object A pointer to an existing VORBIS_COMMENT object.
* \param comment_num The index of the comment to delete.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
* \code object->data.vorbis_comment.num_comments > comment_num \endcode
* \retval FLAC__bool
* \c false if realloc() fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_delete_comment(FLAC__StreamMetadata *object, uint32_t comment_num);
/** Creates a Vorbis comment entry from NUL-terminated name and value strings.
*
* On return, the filled-in \a entry->entry pointer will point to malloc()ed
* memory and shall be owned by the caller. For convenience the entry will
* have a terminating NUL.
*
* \param entry A pointer to a Vorbis comment entry. The entry's
* \c entry pointer should not point to allocated
* memory as it will be overwritten.
* \param field_name The field name in ASCII, \c NUL terminated.
* \param field_value The field value in UTF-8, \c NUL terminated.
* \assert
* \code entry != NULL \endcode
* \code field_name != NULL \endcode
* \code field_value != NULL \endcode
* \retval FLAC__bool
* \c false if malloc() fails, or if \a field_name or \a field_value does
* not comply with the Vorbis comment specification, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(FLAC__StreamMetadata_VorbisComment_Entry *entry, const char *field_name, const char *field_value);
/** Splits a Vorbis comment entry into NUL-terminated name and value strings.
*
* The returned pointers to name and value will be allocated by malloc()
* and shall be owned by the caller.
*
* \param entry An existing Vorbis comment entry.
* \param field_name The address of where the returned pointer to the
* field name will be stored.
* \param field_value The address of where the returned pointer to the
* field value will be stored.
* \assert
* \code (entry.entry != NULL && entry.length > 0) \endcode
* \code memchr(entry.entry, '=', entry.length) != NULL \endcode
* \code field_name != NULL \endcode
* \code field_value != NULL \endcode
* \retval FLAC__bool
* \c false if memory allocation fails or \a entry does not comply with the
* Vorbis comment specification, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_to_name_value_pair(const FLAC__StreamMetadata_VorbisComment_Entry entry, char **field_name, char **field_value);
/** Check if the given Vorbis comment entry's field name matches the given
* field name.
*
* \param entry An existing Vorbis comment entry.
* \param field_name The field name to check.
* \param field_name_length The length of \a field_name, not including the
* terminating \c NUL.
* \assert
* \code (entry.entry != NULL && entry.length > 0) \endcode
* \retval FLAC__bool
* \c true if the field names match, else \c false
*/
FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_matches(const FLAC__StreamMetadata_VorbisComment_Entry entry, const char *field_name, uint32_t field_name_length);
/** Find a Vorbis comment with the given field name.
*
* The search begins at entry number \a offset; use an offset of 0 to
* search from the beginning of the comment array.
*
* \param object A pointer to an existing VORBIS_COMMENT object.
* \param offset The offset into the comment array from where to start
* the search.
* \param field_name The field name of the comment to find.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
* \code field_name != NULL \endcode
* \retval int
* The offset in the comment array of the first comment whose field
* name matches \a field_name, or \c -1 if no match was found.
*/
FLAC_API int FLAC__metadata_object_vorbiscomment_find_entry_from(const FLAC__StreamMetadata *object, uint32_t offset, const char *field_name);
/** Remove first Vorbis comment matching the given field name.
*
* \param object A pointer to an existing VORBIS_COMMENT object.
* \param field_name The field name of comment to delete.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
* \retval int
* \c -1 for memory allocation error, \c 0 for no matching entries,
* \c 1 for one matching entry deleted.
*/
FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entry_matching(FLAC__StreamMetadata *object, const char *field_name);
/** Remove all Vorbis comments matching the given field name.
*
* \param object A pointer to an existing VORBIS_COMMENT object.
* \param field_name The field name of comments to delete.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
* \retval int
* \c -1 for memory allocation error, \c 0 for no matching entries,
* else the number of matching entries deleted.
*/
FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entries_matching(FLAC__StreamMetadata *object, const char *field_name);
/** Create a new CUESHEET track instance.
*
* The object will be "empty"; i.e. values and data pointers will be \c 0.
*
* \retval FLAC__StreamMetadata_CueSheet_Track*
* \c NULL if there was an error allocating memory, else the new instance.
*/
FLAC_API FLAC__StreamMetadata_CueSheet_Track *FLAC__metadata_object_cuesheet_track_new(void);
/** Create a copy of an existing CUESHEET track object.
*
* The copy is a "deep" copy, i.e. dynamically allocated data within the
* object is also copied. The caller takes ownership of the new object and
* is responsible for freeing it with
* FLAC__metadata_object_cuesheet_track_delete().
*
* \param object Pointer to object to copy.
* \assert
* \code object != NULL \endcode
* \retval FLAC__StreamMetadata_CueSheet_Track*
* \c NULL if there was an error allocating memory, else the new instance.
*/
FLAC_API FLAC__StreamMetadata_CueSheet_Track *FLAC__metadata_object_cuesheet_track_clone(const FLAC__StreamMetadata_CueSheet_Track *object);
/** Delete a CUESHEET track object
*
* \param object A pointer to an existing CUESHEET track object.
* \assert
* \code object != NULL \endcode
*/
FLAC_API void FLAC__metadata_object_cuesheet_track_delete(FLAC__StreamMetadata_CueSheet_Track *object);
/** Resize a track's index point array.
*
* If the size shrinks, elements will truncated; if it grows, new blank
* indices will be added to the end. If this function returns false, the
* track object is left untouched.
*
* \param object A pointer to an existing CUESHEET object.
* \param track_num The index of the track to modify. NOTE: this is not
* necessarily the same as the track's \a number field.
* \param new_num_indices The desired length of the array; may be \c 0.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
* \code object->data.cue_sheet.num_tracks > track_num \endcode
* \code (object->data.cue_sheet.tracks[track_num].indices == NULL && object->data.cue_sheet.tracks[track_num].num_indices == 0) ||
* (object->data.cue_sheet.tracks[track_num].indices != NULL && object->data.cue_sheet.tracks[track_num].num_indices > 0) \endcode
* \retval FLAC__bool
* \c false if memory allocation error, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_resize_indices(FLAC__StreamMetadata *object, uint32_t track_num, uint32_t new_num_indices);
/** Insert an index point in a CUESHEET track at the given index.
*
* \param object A pointer to an existing CUESHEET object.
* \param track_num The index of the track to modify. NOTE: this is not
* necessarily the same as the track's \a number field.
* \param index_num The index into the track's index array at which to
* insert the index point. NOTE: this is not necessarily
* the same as the index point's \a number field. The
* indices at and after \a index_num move right one
* position. To append an index point to the end, set
* \a index_num to
* \c object->data.cue_sheet.tracks[track_num].num_indices .
* \param index The index point to insert.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
* \code object->data.cue_sheet.num_tracks > track_num \endcode
* \code object->data.cue_sheet.tracks[track_num].num_indices >= index_num \endcode
* \retval FLAC__bool
* \c false if realloc() fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_insert_index(FLAC__StreamMetadata *object, uint32_t track_num, uint32_t index_num, FLAC__StreamMetadata_CueSheet_Index index);
/** Insert a blank index point in a CUESHEET track at the given index.
*
* A blank index point is one in which all field values are zero.
*
* \param object A pointer to an existing CUESHEET object.
* \param track_num The index of the track to modify. NOTE: this is not
* necessarily the same as the track's \a number field.
* \param index_num The index into the track's index array at which to
* insert the index point. NOTE: this is not necessarily
* the same as the index point's \a number field. The
* indices at and after \a index_num move right one
* position. To append an index point to the end, set
* \a index_num to
* \c object->data.cue_sheet.tracks[track_num].num_indices .
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
* \code object->data.cue_sheet.num_tracks > track_num \endcode
* \code object->data.cue_sheet.tracks[track_num].num_indices >= index_num \endcode
* \retval FLAC__bool
* \c false if realloc() fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_insert_blank_index(FLAC__StreamMetadata *object, uint32_t track_num, uint32_t index_num);
/** Delete an index point in a CUESHEET track at the given index.
*
* \param object A pointer to an existing CUESHEET object.
* \param track_num The index into the track array of the track to
* modify. NOTE: this is not necessarily the same
* as the track's \a number field.
* \param index_num The index into the track's index array of the index
* to delete. NOTE: this is not necessarily the same
* as the index's \a number field.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
* \code object->data.cue_sheet.num_tracks > track_num \endcode
* \code object->data.cue_sheet.tracks[track_num].num_indices > index_num \endcode
* \retval FLAC__bool
* \c false if realloc() fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_delete_index(FLAC__StreamMetadata *object, uint32_t track_num, uint32_t index_num);
/** Resize the track array.
*
* If the size shrinks, elements will truncated; if it grows, new blank
* tracks will be added to the end. If this function returns false, the
* object is left untouched.
*
* \param object A pointer to an existing CUESHEET object.
* \param new_num_tracks The desired length of the array; may be \c 0.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
* \code (object->data.cue_sheet.tracks == NULL && object->data.cue_sheet.num_tracks == 0) ||
* (object->data.cue_sheet.tracks != NULL && object->data.cue_sheet.num_tracks > 0) \endcode
* \retval FLAC__bool
* \c false if memory allocation error, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_resize_tracks(FLAC__StreamMetadata *object, uint32_t new_num_tracks);
/** Sets a track in a CUESHEET block.
*
* If \a copy is \c true, a copy of the track is stored; otherwise, the object
* takes ownership of the \a track pointer.
*
* \param object A pointer to an existing CUESHEET object.
* \param track_num Index into track array to set. NOTE: this is not
* necessarily the same as the track's \a number field.
* \param track The track to set the track to. You may safely pass in
* a const pointer if \a copy is \c true.
* \param copy See above.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
* \code track_num < object->data.cue_sheet.num_tracks \endcode
* \code (track->indices != NULL && track->num_indices > 0) ||
* (track->indices == NULL && track->num_indices == 0) \endcode
* \retval FLAC__bool
* \c false if \a copy is \c true and malloc() fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_set_track(FLAC__StreamMetadata *object, uint32_t track_num, FLAC__StreamMetadata_CueSheet_Track *track, FLAC__bool copy);
/** Insert a track in a CUESHEET block at the given index.
*
* If \a copy is \c true, a copy of the track is stored; otherwise, the object
* takes ownership of the \a track pointer.
*
* \param object A pointer to an existing CUESHEET object.
* \param track_num The index at which to insert the track. NOTE: this
* is not necessarily the same as the track's \a number
* field. The tracks at and after \a track_num move right
* one position. To append a track to the end, set
* \a track_num to \c object->data.cue_sheet.num_tracks .
* \param track The track to insert. You may safely pass in a const
* pointer if \a copy is \c true.
* \param copy See above.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
* \code object->data.cue_sheet.num_tracks >= track_num \endcode
* \retval FLAC__bool
* \c false if \a copy is \c true and malloc() fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_insert_track(FLAC__StreamMetadata *object, uint32_t track_num, FLAC__StreamMetadata_CueSheet_Track *track, FLAC__bool copy);
/** Insert a blank track in a CUESHEET block at the given index.
*
* A blank track is one in which all field values are zero.
*
* \param object A pointer to an existing CUESHEET object.
* \param track_num The index at which to insert the track. NOTE: this
* is not necessarily the same as the track's \a number
* field. The tracks at and after \a track_num move right
* one position. To append a track to the end, set
* \a track_num to \c object->data.cue_sheet.num_tracks .
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
* \code object->data.cue_sheet.num_tracks >= track_num \endcode
* \retval FLAC__bool
* \c false if \a copy is \c true and malloc() fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_insert_blank_track(FLAC__StreamMetadata *object, uint32_t track_num);
/** Delete a track in a CUESHEET block at the given index.
*
* \param object A pointer to an existing CUESHEET object.
* \param track_num The index into the track array of the track to
* delete. NOTE: this is not necessarily the same
* as the track's \a number field.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
* \code object->data.cue_sheet.num_tracks > track_num \endcode
* \retval FLAC__bool
* \c false if realloc() fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_delete_track(FLAC__StreamMetadata *object, uint32_t track_num);
/** Check a cue sheet to see if it conforms to the FLAC specification.
* See the format specification for limits on the contents of the
* cue sheet.
*
* \param object A pointer to an existing CUESHEET object.
* \param check_cd_da_subset If \c true, check CUESHEET against more
* stringent requirements for a CD-DA (audio) disc.
* \param violation Address of a pointer to a string. If there is a
* violation, a pointer to a string explanation of the
* violation will be returned here. \a violation may be
* \c NULL if you don't need the returned string. Do not
* free the returned string; it will always point to static
* data.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
* \retval FLAC__bool
* \c false if cue sheet is illegal, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_is_legal(const FLAC__StreamMetadata *object, FLAC__bool check_cd_da_subset, const char **violation);
/** Calculate and return the CDDB/freedb ID for a cue sheet. The function
* assumes the cue sheet corresponds to a CD; the result is undefined
* if the cuesheet's is_cd bit is not set.
*
* \param object A pointer to an existing CUESHEET object.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
* \retval FLAC__uint32
* The unsigned integer representation of the CDDB/freedb ID
*/
FLAC_API FLAC__uint32 FLAC__metadata_object_cuesheet_calculate_cddb_id(const FLAC__StreamMetadata *object);
/** Sets the MIME type of a PICTURE block.
*
* If \a copy is \c true, a copy of the string is stored; otherwise, the object
* takes ownership of the pointer. The existing string will be freed if this
* function is successful, otherwise the original string will remain if \a copy
* is \c true and malloc() fails.
*
* \note It is safe to pass a const pointer to \a mime_type if \a copy is \c true.
*
* \param object A pointer to an existing PICTURE object.
* \param mime_type A pointer to the MIME type string. The string must be
* ASCII characters 0x20-0x7e, NUL-terminated. No validation
* is done.
* \param copy See above.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_PICTURE \endcode
* \code (mime_type != NULL) \endcode
* \retval FLAC__bool
* \c false if \a copy is \c true and malloc() fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_picture_set_mime_type(FLAC__StreamMetadata *object, char *mime_type, FLAC__bool copy);
/** Sets the description of a PICTURE block.
*
* If \a copy is \c true, a copy of the string is stored; otherwise, the object
* takes ownership of the pointer. The existing string will be freed if this
* function is successful, otherwise the original string will remain if \a copy
* is \c true and malloc() fails.
*
* \note It is safe to pass a const pointer to \a description if \a copy is \c true.
*
* \param object A pointer to an existing PICTURE object.
* \param description A pointer to the description string. The string must be
* valid UTF-8, NUL-terminated. No validation is done.
* \param copy See above.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_PICTURE \endcode
* \code (description != NULL) \endcode
* \retval FLAC__bool
* \c false if \a copy is \c true and malloc() fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_picture_set_description(FLAC__StreamMetadata *object, FLAC__byte *description, FLAC__bool copy);
/** Sets the picture data of a PICTURE block.
*
* If \a copy is \c true, a copy of the data is stored; otherwise, the object
* takes ownership of the pointer. Also sets the \a data_length field of the
* metadata object to what is passed in as the \a length parameter. The
* existing data will be freed if this function is successful, otherwise the
* original data and data_length will remain if \a copy is \c true and
* malloc() fails.
*
* \note It is safe to pass a const pointer to \a data if \a copy is \c true.
*
* \param object A pointer to an existing PICTURE object.
* \param data A pointer to the data to set.
* \param length The length of \a data in bytes.
* \param copy See above.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_PICTURE \endcode
* \code (data != NULL && length > 0) ||
* (data == NULL && length == 0 && copy == false) \endcode
* \retval FLAC__bool
* \c false if \a copy is \c true and malloc() fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_picture_set_data(FLAC__StreamMetadata *object, FLAC__byte *data, FLAC__uint32 length, FLAC__bool copy);
/** Check a PICTURE block to see if it conforms to the FLAC specification.
* See the format specification for limits on the contents of the
* PICTURE block.
*
* \param object A pointer to existing PICTURE block to be checked.
* \param violation Address of a pointer to a string. If there is a
* violation, a pointer to a string explanation of the
* violation will be returned here. \a violation may be
* \c NULL if you don't need the returned string. Do not
* free the returned string; it will always point to static
* data.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_PICTURE \endcode
* \retval FLAC__bool
* \c false if PICTURE block is illegal, else \c true.
*/
FLAC_API FLAC__bool FLAC__metadata_object_picture_is_legal(const FLAC__StreamMetadata *object, const char **violation);
/* \} */
#ifdef __cplusplus
}
#endif
#endif