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1024 lines
39 KiB
C
1024 lines
39 KiB
C
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/* libFLAC - Free Lossless Audio Codec library
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* Copyright (C) 2000-2009 Josh Coalson
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* Copyright (C) 2011-2013 Xiph.Org Foundation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of the Xiph.org Foundation nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef FLAC__FORMAT_H
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#define FLAC__FORMAT_H
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#include "export.h"
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#include "ordinals.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** \file include/FLAC/format.h
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*
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* \brief
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* This module contains structure definitions for the representation
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* of FLAC format components in memory. These are the basic
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* structures used by the rest of the interfaces.
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*
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* See the detailed documentation in the
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* \link flac_format format \endlink module.
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*/
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/** \defgroup flac_format FLAC/format.h: format components
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* \ingroup flac
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*
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* \brief
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* This module contains structure definitions for the representation
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* of FLAC format components in memory. These are the basic
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* structures used by the rest of the interfaces.
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*
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* First, you should be familiar with the
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* <A HREF="../format.html">FLAC format</A>. Many of the values here
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* follow directly from the specification. As a user of libFLAC, the
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* interesting parts really are the structures that describe the frame
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* header and metadata blocks.
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*
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* The format structures here are very primitive, designed to store
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* information in an efficient way. Reading information from the
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* structures is easy but creating or modifying them directly is
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* more complex. For the most part, as a user of a library, editing
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* is not necessary; however, for metadata blocks it is, so there are
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* convenience functions provided in the \link flac_metadata metadata
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* module \endlink to simplify the manipulation of metadata blocks.
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*
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* \note
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* It's not the best convention, but symbols ending in _LEN are in bits
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* and _LENGTH are in bytes. _LENGTH symbols are \#defines instead of
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* global variables because they are usually used when declaring byte
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* arrays and some compilers require compile-time knowledge of array
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* sizes when declared on the stack.
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*
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* \{
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*/
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/*
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Most of the values described in this file are defined by the FLAC
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format specification. There is nothing to tune here.
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*/
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/** The largest legal metadata type code. */
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#define FLAC__MAX_METADATA_TYPE_CODE (126u)
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/** The minimum block size, in samples, permitted by the format. */
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#define FLAC__MIN_BLOCK_SIZE (16u)
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/** The maximum block size, in samples, permitted by the format. */
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#define FLAC__MAX_BLOCK_SIZE (65535u)
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/** The maximum block size, in samples, permitted by the FLAC subset for
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* sample rates up to 48kHz. */
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#define FLAC__SUBSET_MAX_BLOCK_SIZE_48000HZ (4608u)
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/** The maximum number of channels permitted by the format. */
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#define FLAC__MAX_CHANNELS (8u)
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/** The minimum sample resolution permitted by the format. */
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#define FLAC__MIN_BITS_PER_SAMPLE (4u)
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/** The maximum sample resolution permitted by the format. */
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#define FLAC__MAX_BITS_PER_SAMPLE (32u)
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/** The maximum sample resolution permitted by libFLAC.
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*
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* \warning
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* FLAC__MAX_BITS_PER_SAMPLE is the limit of the FLAC format. However,
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* the reference encoder/decoder is currently limited to 24 bits because
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* of prevalent 32-bit math, so make sure and use this value when
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* appropriate.
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*/
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#define FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE (24u)
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/** The maximum sample rate permitted by the format. The value is
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* ((2 ^ 16) - 1) * 10; see <A HREF="../format.html">FLAC format</A>
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* as to why.
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*/
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#define FLAC__MAX_SAMPLE_RATE (655350u)
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/** The maximum LPC order permitted by the format. */
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#define FLAC__MAX_LPC_ORDER (32u)
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/** The maximum LPC order permitted by the FLAC subset for sample rates
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* up to 48kHz. */
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#define FLAC__SUBSET_MAX_LPC_ORDER_48000HZ (12u)
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/** The minimum quantized linear predictor coefficient precision
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* permitted by the format.
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*/
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#define FLAC__MIN_QLP_COEFF_PRECISION (5u)
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/** The maximum quantized linear predictor coefficient precision
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* permitted by the format.
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*/
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#define FLAC__MAX_QLP_COEFF_PRECISION (15u)
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/** The maximum order of the fixed predictors permitted by the format. */
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#define FLAC__MAX_FIXED_ORDER (4u)
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/** The maximum Rice partition order permitted by the format. */
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#define FLAC__MAX_RICE_PARTITION_ORDER (15u)
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/** The maximum Rice partition order permitted by the FLAC Subset. */
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#define FLAC__SUBSET_MAX_RICE_PARTITION_ORDER (8u)
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/** The version string of the release, stamped onto the libraries and binaries.
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*
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* \note
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* This does not correspond to the shared library version number, which
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* is used to determine binary compatibility.
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*/
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extern FLAC_API const char *FLAC__VERSION_STRING;
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/** The vendor string inserted by the encoder into the VORBIS_COMMENT block.
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* This is a NUL-terminated ASCII string; when inserted into the
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* VORBIS_COMMENT the trailing null is stripped.
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*/
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extern FLAC_API const char *FLAC__VENDOR_STRING;
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/** The byte string representation of the beginning of a FLAC stream. */
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extern FLAC_API const FLAC__byte FLAC__STREAM_SYNC_STRING[4]; /* = "fLaC" */
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/** The 32-bit integer big-endian representation of the beginning of
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* a FLAC stream.
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*/
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extern FLAC_API const unsigned FLAC__STREAM_SYNC; /* = 0x664C6143 */
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/** The length of the FLAC signature in bits. */
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extern FLAC_API const unsigned FLAC__STREAM_SYNC_LEN; /* = 32 bits */
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/** The length of the FLAC signature in bytes. */
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#define FLAC__STREAM_SYNC_LENGTH (4u)
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/*****************************************************************************
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*
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* Subframe structures
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*
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*****************************************************************************/
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/*****************************************************************************/
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/** An enumeration of the available entropy coding methods. */
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typedef enum {
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FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE = 0,
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/**< Residual is coded by partitioning into contexts, each with it's own
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* 4-bit Rice parameter. */
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FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2 = 1
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/**< Residual is coded by partitioning into contexts, each with it's own
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* 5-bit Rice parameter. */
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} FLAC__EntropyCodingMethodType;
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/** Maps a FLAC__EntropyCodingMethodType to a C string.
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*
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* Using a FLAC__EntropyCodingMethodType as the index to this array will
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* give the string equivalent. The contents should not be modified.
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*/
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extern FLAC_API const char * const FLAC__EntropyCodingMethodTypeString[];
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/** Contents of a Rice partitioned residual
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*/
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typedef struct {
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unsigned *parameters;
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/**< The Rice parameters for each context. */
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unsigned *raw_bits;
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/**< Widths for escape-coded partitions. Will be non-zero for escaped
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* partitions and zero for unescaped partitions.
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*/
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unsigned capacity_by_order;
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/**< The capacity of the \a parameters and \a raw_bits arrays
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* specified as an order, i.e. the number of array elements
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* allocated is 2 ^ \a capacity_by_order.
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*/
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} FLAC__EntropyCodingMethod_PartitionedRiceContents;
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/** Header for a Rice partitioned residual. (c.f. <A HREF="../format.html#partitioned_rice">format specification</A>)
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*/
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typedef struct {
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unsigned order;
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/**< The partition order, i.e. # of contexts = 2 ^ \a order. */
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const FLAC__EntropyCodingMethod_PartitionedRiceContents *contents;
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/**< The context's Rice parameters and/or raw bits. */
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} FLAC__EntropyCodingMethod_PartitionedRice;
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extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN; /**< == 4 (bits) */
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extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN; /**< == 4 (bits) */
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extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN; /**< == 5 (bits) */
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extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN; /**< == 5 (bits) */
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extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
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/**< == (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN)-1 */
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extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER;
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/**< == (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN)-1 */
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/** Header for the entropy coding method. (c.f. <A HREF="../format.html#residual">format specification</A>)
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*/
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typedef struct {
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FLAC__EntropyCodingMethodType type;
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union {
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FLAC__EntropyCodingMethod_PartitionedRice partitioned_rice;
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} data;
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} FLAC__EntropyCodingMethod;
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extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_TYPE_LEN; /**< == 2 (bits) */
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/*****************************************************************************/
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/** An enumeration of the available subframe types. */
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typedef enum {
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FLAC__SUBFRAME_TYPE_CONSTANT = 0, /**< constant signal */
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FLAC__SUBFRAME_TYPE_VERBATIM = 1, /**< uncompressed signal */
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FLAC__SUBFRAME_TYPE_FIXED = 2, /**< fixed polynomial prediction */
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FLAC__SUBFRAME_TYPE_LPC = 3 /**< linear prediction */
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} FLAC__SubframeType;
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/** Maps a FLAC__SubframeType to a C string.
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*
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* Using a FLAC__SubframeType as the index to this array will
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* give the string equivalent. The contents should not be modified.
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*/
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extern FLAC_API const char * const FLAC__SubframeTypeString[];
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/** CONSTANT subframe. (c.f. <A HREF="../format.html#subframe_constant">format specification</A>)
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*/
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typedef struct {
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FLAC__int32 value; /**< The constant signal value. */
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} FLAC__Subframe_Constant;
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/** VERBATIM subframe. (c.f. <A HREF="../format.html#subframe_verbatim">format specification</A>)
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*/
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typedef struct {
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const FLAC__int32 *data; /**< A pointer to verbatim signal. */
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} FLAC__Subframe_Verbatim;
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/** FIXED subframe. (c.f. <A HREF="../format.html#subframe_fixed">format specification</A>)
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*/
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typedef struct {
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FLAC__EntropyCodingMethod entropy_coding_method;
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/**< The residual coding method. */
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unsigned order;
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/**< The polynomial order. */
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FLAC__int32 warmup[FLAC__MAX_FIXED_ORDER];
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/**< Warmup samples to prime the predictor, length == order. */
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const FLAC__int32 *residual;
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/**< The residual signal, length == (blocksize minus order) samples. */
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} FLAC__Subframe_Fixed;
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/** LPC subframe. (c.f. <A HREF="../format.html#subframe_lpc">format specification</A>)
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*/
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typedef struct {
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FLAC__EntropyCodingMethod entropy_coding_method;
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/**< The residual coding method. */
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unsigned order;
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/**< The FIR order. */
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unsigned qlp_coeff_precision;
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/**< Quantized FIR filter coefficient precision in bits. */
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int quantization_level;
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/**< The qlp coeff shift needed. */
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FLAC__int32 qlp_coeff[FLAC__MAX_LPC_ORDER];
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/**< FIR filter coefficients. */
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FLAC__int32 warmup[FLAC__MAX_LPC_ORDER];
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/**< Warmup samples to prime the predictor, length == order. */
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const FLAC__int32 *residual;
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/**< The residual signal, length == (blocksize minus order) samples. */
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} FLAC__Subframe_LPC;
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extern FLAC_API const unsigned FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN; /**< == 4 (bits) */
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extern FLAC_API const unsigned FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN; /**< == 5 (bits) */
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/** FLAC subframe structure. (c.f. <A HREF="../format.html#subframe">format specification</A>)
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*/
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typedef struct {
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FLAC__SubframeType type;
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union {
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FLAC__Subframe_Constant constant;
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FLAC__Subframe_Fixed fixed;
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FLAC__Subframe_LPC lpc;
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FLAC__Subframe_Verbatim verbatim;
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} data;
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unsigned wasted_bits;
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} FLAC__Subframe;
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/** == 1 (bit)
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*
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* This used to be a zero-padding bit (hence the name
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* FLAC__SUBFRAME_ZERO_PAD_LEN) but is now a reserved bit. It still has a
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* mandatory value of \c 0 but in the future may take on the value \c 0 or \c 1
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* to mean something else.
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*/
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extern FLAC_API const unsigned FLAC__SUBFRAME_ZERO_PAD_LEN;
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extern FLAC_API const unsigned FLAC__SUBFRAME_TYPE_LEN; /**< == 6 (bits) */
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extern FLAC_API const unsigned FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN; /**< == 1 (bit) */
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extern FLAC_API const unsigned FLAC__SUBFRAME_TYPE_CONSTANT_BYTE_ALIGNED_MASK; /**< = 0x00 */
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extern FLAC_API const unsigned FLAC__SUBFRAME_TYPE_VERBATIM_BYTE_ALIGNED_MASK; /**< = 0x02 */
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extern FLAC_API const unsigned FLAC__SUBFRAME_TYPE_FIXED_BYTE_ALIGNED_MASK; /**< = 0x10 */
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extern FLAC_API const unsigned FLAC__SUBFRAME_TYPE_LPC_BYTE_ALIGNED_MASK; /**< = 0x40 */
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/*****************************************************************************/
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/*****************************************************************************
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*
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* Frame structures
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*
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*****************************************************************************/
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/** An enumeration of the available channel assignments. */
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typedef enum {
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FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT = 0, /**< independent channels */
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FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE = 1, /**< left+side stereo */
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FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE = 2, /**< right+side stereo */
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FLAC__CHANNEL_ASSIGNMENT_MID_SIDE = 3 /**< mid+side stereo */
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} FLAC__ChannelAssignment;
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/** Maps a FLAC__ChannelAssignment to a C string.
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*
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* Using a FLAC__ChannelAssignment as the index to this array will
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* give the string equivalent. The contents should not be modified.
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*/
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extern FLAC_API const char * const FLAC__ChannelAssignmentString[];
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/** An enumeration of the possible frame numbering methods. */
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typedef enum {
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FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER, /**< number contains the frame number */
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FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER /**< number contains the sample number of first sample in frame */
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} FLAC__FrameNumberType;
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/** Maps a FLAC__FrameNumberType to a C string.
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*
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* Using a FLAC__FrameNumberType as the index to this array will
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||
|
* give the string equivalent. The contents should not be modified.
|
||
|
*/
|
||
|
extern FLAC_API const char * const FLAC__FrameNumberTypeString[];
|
||
|
|
||
|
|
||
|
/** FLAC frame header structure. (c.f. <A HREF="../format.html#frame_header">format specification</A>)
|
||
|
*/
|
||
|
typedef struct {
|
||
|
unsigned blocksize;
|
||
|
/**< The number of samples per subframe. */
|
||
|
|
||
|
unsigned sample_rate;
|
||
|
/**< The sample rate in Hz. */
|
||
|
|
||
|
unsigned channels;
|
||
|
/**< The number of channels (== number of subframes). */
|
||
|
|
||
|
FLAC__ChannelAssignment channel_assignment;
|
||
|
/**< The channel assignment for the frame. */
|
||
|
|
||
|
unsigned bits_per_sample;
|
||
|
/**< The sample resolution. */
|
||
|
|
||
|
FLAC__FrameNumberType number_type;
|
||
|
/**< The numbering scheme used for the frame. As a convenience, the
|
||
|
* decoder will always convert a frame number to a sample number because
|
||
|
* the rules are complex. */
|
||
|
|
||
|
union {
|
||
|
FLAC__uint32 frame_number;
|
||
|
FLAC__uint64 sample_number;
|
||
|
} number;
|
||
|
/**< The frame number or sample number of first sample in frame;
|
||
|
* use the \a number_type value to determine which to use. */
|
||
|
|
||
|
FLAC__uint8 crc;
|
||
|
/**< CRC-8 (polynomial = x^8 + x^2 + x^1 + x^0, initialized with 0)
|
||
|
* of the raw frame header bytes, meaning everything before the CRC byte
|
||
|
* including the sync code.
|
||
|
*/
|
||
|
} FLAC__FrameHeader;
|
||
|
|
||
|
extern FLAC_API const unsigned FLAC__FRAME_HEADER_SYNC; /**< == 0x3ffe; the frame header sync code */
|
||
|
extern FLAC_API const unsigned FLAC__FRAME_HEADER_SYNC_LEN; /**< == 14 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__FRAME_HEADER_RESERVED_LEN; /**< == 1 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__FRAME_HEADER_BLOCKING_STRATEGY_LEN; /**< == 1 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__FRAME_HEADER_BLOCK_SIZE_LEN; /**< == 4 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__FRAME_HEADER_SAMPLE_RATE_LEN; /**< == 4 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__FRAME_HEADER_CHANNEL_ASSIGNMENT_LEN; /**< == 4 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__FRAME_HEADER_BITS_PER_SAMPLE_LEN; /**< == 3 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__FRAME_HEADER_ZERO_PAD_LEN; /**< == 1 (bit) */
|
||
|
extern FLAC_API const unsigned FLAC__FRAME_HEADER_CRC_LEN; /**< == 8 (bits) */
|
||
|
|
||
|
|
||
|
/** FLAC frame footer structure. (c.f. <A HREF="../format.html#frame_footer">format specification</A>)
|
||
|
*/
|
||
|
typedef struct {
|
||
|
FLAC__uint16 crc;
|
||
|
/**< CRC-16 (polynomial = x^16 + x^15 + x^2 + x^0, initialized with
|
||
|
* 0) of the bytes before the crc, back to and including the frame header
|
||
|
* sync code.
|
||
|
*/
|
||
|
} FLAC__FrameFooter;
|
||
|
|
||
|
extern FLAC_API const unsigned FLAC__FRAME_FOOTER_CRC_LEN; /**< == 16 (bits) */
|
||
|
|
||
|
|
||
|
/** FLAC frame structure. (c.f. <A HREF="../format.html#frame">format specification</A>)
|
||
|
*/
|
||
|
typedef struct {
|
||
|
FLAC__FrameHeader header;
|
||
|
FLAC__Subframe subframes[FLAC__MAX_CHANNELS];
|
||
|
FLAC__FrameFooter footer;
|
||
|
} FLAC__Frame;
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
|
||
|
|
||
|
/*****************************************************************************
|
||
|
*
|
||
|
* Meta-data structures
|
||
|
*
|
||
|
*****************************************************************************/
|
||
|
|
||
|
/** An enumeration of the available metadata block types. */
|
||
|
typedef enum {
|
||
|
|
||
|
FLAC__METADATA_TYPE_STREAMINFO = 0,
|
||
|
/**< <A HREF="../format.html#metadata_block_streaminfo">STREAMINFO</A> block */
|
||
|
|
||
|
FLAC__METADATA_TYPE_PADDING = 1,
|
||
|
/**< <A HREF="../format.html#metadata_block_padding">PADDING</A> block */
|
||
|
|
||
|
FLAC__METADATA_TYPE_APPLICATION = 2,
|
||
|
/**< <A HREF="../format.html#metadata_block_application">APPLICATION</A> block */
|
||
|
|
||
|
FLAC__METADATA_TYPE_SEEKTABLE = 3,
|
||
|
/**< <A HREF="../format.html#metadata_block_seektable">SEEKTABLE</A> block */
|
||
|
|
||
|
FLAC__METADATA_TYPE_VORBIS_COMMENT = 4,
|
||
|
/**< <A HREF="../format.html#metadata_block_vorbis_comment">VORBISCOMMENT</A> block (a.k.a. FLAC tags) */
|
||
|
|
||
|
FLAC__METADATA_TYPE_CUESHEET = 5,
|
||
|
/**< <A HREF="../format.html#metadata_block_cuesheet">CUESHEET</A> block */
|
||
|
|
||
|
FLAC__METADATA_TYPE_PICTURE = 6,
|
||
|
/**< <A HREF="../format.html#metadata_block_picture">PICTURE</A> block */
|
||
|
|
||
|
FLAC__METADATA_TYPE_UNDEFINED = 7
|
||
|
/**< marker to denote beginning of undefined type range; this number will increase as new metadata types are added */
|
||
|
|
||
|
} FLAC__MetadataType;
|
||
|
|
||
|
/** Maps a FLAC__MetadataType to a C string.
|
||
|
*
|
||
|
* Using a FLAC__MetadataType as the index to this array will
|
||
|
* give the string equivalent. The contents should not be modified.
|
||
|
*/
|
||
|
extern FLAC_API const char * const FLAC__MetadataTypeString[];
|
||
|
|
||
|
|
||
|
/** FLAC STREAMINFO structure. (c.f. <A HREF="../format.html#metadata_block_streaminfo">format specification</A>)
|
||
|
*/
|
||
|
typedef struct {
|
||
|
unsigned min_blocksize, max_blocksize;
|
||
|
unsigned min_framesize, max_framesize;
|
||
|
unsigned sample_rate;
|
||
|
unsigned channels;
|
||
|
unsigned bits_per_sample;
|
||
|
FLAC__uint64 total_samples;
|
||
|
FLAC__byte md5sum[16];
|
||
|
} FLAC__StreamMetadata_StreamInfo;
|
||
|
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN; /**< == 16 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN; /**< == 16 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN; /**< == 24 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN; /**< == 24 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN; /**< == 20 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN; /**< == 3 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN; /**< == 5 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN; /**< == 36 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MD5SUM_LEN; /**< == 128 (bits) */
|
||
|
|
||
|
/** The total stream length of the STREAMINFO block in bytes. */
|
||
|
#define FLAC__STREAM_METADATA_STREAMINFO_LENGTH (34u)
|
||
|
|
||
|
/** FLAC PADDING structure. (c.f. <A HREF="../format.html#metadata_block_padding">format specification</A>)
|
||
|
*/
|
||
|
typedef struct {
|
||
|
int dummy;
|
||
|
/**< Conceptually this is an empty struct since we don't store the
|
||
|
* padding bytes. Empty structs are not allowed by some C compilers,
|
||
|
* hence the dummy.
|
||
|
*/
|
||
|
} FLAC__StreamMetadata_Padding;
|
||
|
|
||
|
|
||
|
/** FLAC APPLICATION structure. (c.f. <A HREF="../format.html#metadata_block_application">format specification</A>)
|
||
|
*/
|
||
|
typedef struct {
|
||
|
FLAC__byte id[4];
|
||
|
FLAC__byte *data;
|
||
|
} FLAC__StreamMetadata_Application;
|
||
|
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_APPLICATION_ID_LEN; /**< == 32 (bits) */
|
||
|
|
||
|
/** SeekPoint structure used in SEEKTABLE blocks. (c.f. <A HREF="../format.html#seekpoint">format specification</A>)
|
||
|
*/
|
||
|
typedef struct {
|
||
|
FLAC__uint64 sample_number;
|
||
|
/**< The sample number of the target frame. */
|
||
|
|
||
|
FLAC__uint64 stream_offset;
|
||
|
/**< The offset, in bytes, of the target frame with respect to
|
||
|
* beginning of the first frame. */
|
||
|
|
||
|
unsigned frame_samples;
|
||
|
/**< The number of samples in the target frame. */
|
||
|
} FLAC__StreamMetadata_SeekPoint;
|
||
|
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN; /**< == 64 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN; /**< == 64 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN; /**< == 16 (bits) */
|
||
|
|
||
|
/** The total stream length of a seek point in bytes. */
|
||
|
#define FLAC__STREAM_METADATA_SEEKPOINT_LENGTH (18u)
|
||
|
|
||
|
/** The value used in the \a sample_number field of
|
||
|
* FLAC__StreamMetadataSeekPoint used to indicate a placeholder
|
||
|
* point (== 0xffffffffffffffff).
|
||
|
*/
|
||
|
extern FLAC_API const FLAC__uint64 FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
|
||
|
|
||
|
|
||
|
/** FLAC SEEKTABLE structure. (c.f. <A HREF="../format.html#metadata_block_seektable">format specification</A>)
|
||
|
*
|
||
|
* \note From the format specification:
|
||
|
* - The seek points must be sorted by ascending sample number.
|
||
|
* - Each seek point's sample number must be the first sample of the
|
||
|
* target frame.
|
||
|
* - Each seek point's sample number must be unique within the table.
|
||
|
* - Existence of a SEEKTABLE block implies a correct setting of
|
||
|
* total_samples in the stream_info block.
|
||
|
* - Behavior is undefined when more than one SEEKTABLE block is
|
||
|
* present in a stream.
|
||
|
*/
|
||
|
typedef struct {
|
||
|
unsigned num_points;
|
||
|
FLAC__StreamMetadata_SeekPoint *points;
|
||
|
} FLAC__StreamMetadata_SeekTable;
|
||
|
|
||
|
|
||
|
/** Vorbis comment entry structure used in VORBIS_COMMENT blocks. (c.f. <A HREF="../format.html#metadata_block_vorbis_comment">format specification</A>)
|
||
|
*
|
||
|
* For convenience, the APIs maintain a trailing NUL character at the end of
|
||
|
* \a entry which is not counted toward \a length, i.e.
|
||
|
* \code strlen(entry) == length \endcode
|
||
|
*/
|
||
|
typedef struct {
|
||
|
FLAC__uint32 length;
|
||
|
FLAC__byte *entry;
|
||
|
} FLAC__StreamMetadata_VorbisComment_Entry;
|
||
|
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN; /**< == 32 (bits) */
|
||
|
|
||
|
|
||
|
/** FLAC VORBIS_COMMENT structure. (c.f. <A HREF="../format.html#metadata_block_vorbis_comment">format specification</A>)
|
||
|
*/
|
||
|
typedef struct {
|
||
|
FLAC__StreamMetadata_VorbisComment_Entry vendor_string;
|
||
|
FLAC__uint32 num_comments;
|
||
|
FLAC__StreamMetadata_VorbisComment_Entry *comments;
|
||
|
} FLAC__StreamMetadata_VorbisComment;
|
||
|
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN; /**< == 32 (bits) */
|
||
|
|
||
|
|
||
|
/** FLAC CUESHEET track index structure. (See the
|
||
|
* <A HREF="../format.html#cuesheet_track_index">format specification</A> for
|
||
|
* the full description of each field.)
|
||
|
*/
|
||
|
typedef struct {
|
||
|
FLAC__uint64 offset;
|
||
|
/**< Offset in samples, relative to the track offset, of the index
|
||
|
* point.
|
||
|
*/
|
||
|
|
||
|
FLAC__byte number;
|
||
|
/**< The index point number. */
|
||
|
} FLAC__StreamMetadata_CueSheet_Index;
|
||
|
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN; /**< == 64 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN; /**< == 8 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN; /**< == 3*8 (bits) */
|
||
|
|
||
|
|
||
|
/** FLAC CUESHEET track structure. (See the
|
||
|
* <A HREF="../format.html#cuesheet_track">format specification</A> for
|
||
|
* the full description of each field.)
|
||
|
*/
|
||
|
typedef struct {
|
||
|
FLAC__uint64 offset;
|
||
|
/**< Track offset in samples, relative to the beginning of the FLAC audio stream. */
|
||
|
|
||
|
FLAC__byte number;
|
||
|
/**< The track number. */
|
||
|
|
||
|
char isrc[13];
|
||
|
/**< Track ISRC. This is a 12-digit alphanumeric code plus a trailing \c NUL byte */
|
||
|
|
||
|
unsigned type:1;
|
||
|
/**< The track type: 0 for audio, 1 for non-audio. */
|
||
|
|
||
|
unsigned pre_emphasis:1;
|
||
|
/**< The pre-emphasis flag: 0 for no pre-emphasis, 1 for pre-emphasis. */
|
||
|
|
||
|
FLAC__byte num_indices;
|
||
|
/**< The number of track index points. */
|
||
|
|
||
|
FLAC__StreamMetadata_CueSheet_Index *indices;
|
||
|
/**< NULL if num_indices == 0, else pointer to array of index points. */
|
||
|
|
||
|
} FLAC__StreamMetadata_CueSheet_Track;
|
||
|
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN; /**< == 64 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN; /**< == 8 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN; /**< == 12*8 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN; /**< == 1 (bit) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN; /**< == 1 (bit) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN; /**< == 6+13*8 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN; /**< == 8 (bits) */
|
||
|
|
||
|
|
||
|
/** FLAC CUESHEET structure. (See the
|
||
|
* <A HREF="../format.html#metadata_block_cuesheet">format specification</A>
|
||
|
* for the full description of each field.)
|
||
|
*/
|
||
|
typedef struct {
|
||
|
char media_catalog_number[129];
|
||
|
/**< Media catalog number, in ASCII printable characters 0x20-0x7e. In
|
||
|
* general, the media catalog number may be 0 to 128 bytes long; any
|
||
|
* unused characters should be right-padded with NUL characters.
|
||
|
*/
|
||
|
|
||
|
FLAC__uint64 lead_in;
|
||
|
/**< The number of lead-in samples. */
|
||
|
|
||
|
FLAC__bool is_cd;
|
||
|
/**< \c true if CUESHEET corresponds to a Compact Disc, else \c false. */
|
||
|
|
||
|
unsigned num_tracks;
|
||
|
/**< The number of tracks. */
|
||
|
|
||
|
FLAC__StreamMetadata_CueSheet_Track *tracks;
|
||
|
/**< NULL if num_tracks == 0, else pointer to array of tracks. */
|
||
|
|
||
|
} FLAC__StreamMetadata_CueSheet;
|
||
|
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN; /**< == 128*8 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN; /**< == 64 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN; /**< == 1 (bit) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN; /**< == 7+258*8 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN; /**< == 8 (bits) */
|
||
|
|
||
|
|
||
|
/** An enumeration of the PICTURE types (see FLAC__StreamMetadataPicture and id3 v2.4 APIC tag). */
|
||
|
typedef enum {
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_OTHER = 0, /**< Other */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON_STANDARD = 1, /**< 32x32 pixels 'file icon' (PNG only) */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON = 2, /**< Other file icon */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_FRONT_COVER = 3, /**< Cover (front) */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_BACK_COVER = 4, /**< Cover (back) */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_LEAFLET_PAGE = 5, /**< Leaflet page */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_MEDIA = 6, /**< Media (e.g. label side of CD) */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_LEAD_ARTIST = 7, /**< Lead artist/lead performer/soloist */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_ARTIST = 8, /**< Artist/performer */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_CONDUCTOR = 9, /**< Conductor */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_BAND = 10, /**< Band/Orchestra */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_COMPOSER = 11, /**< Composer */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_LYRICIST = 12, /**< Lyricist/text writer */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_RECORDING_LOCATION = 13, /**< Recording Location */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_DURING_RECORDING = 14, /**< During recording */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_DURING_PERFORMANCE = 15, /**< During performance */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_VIDEO_SCREEN_CAPTURE = 16, /**< Movie/video screen capture */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_FISH = 17, /**< A bright coloured fish */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_ILLUSTRATION = 18, /**< Illustration */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_BAND_LOGOTYPE = 19, /**< Band/artist logotype */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_PUBLISHER_LOGOTYPE = 20, /**< Publisher/Studio logotype */
|
||
|
FLAC__STREAM_METADATA_PICTURE_TYPE_UNDEFINED
|
||
|
} FLAC__StreamMetadata_Picture_Type;
|
||
|
|
||
|
/** Maps a FLAC__StreamMetadata_Picture_Type to a C string.
|
||
|
*
|
||
|
* Using a FLAC__StreamMetadata_Picture_Type as the index to this array
|
||
|
* will give the string equivalent. The contents should not be
|
||
|
* modified.
|
||
|
*/
|
||
|
extern FLAC_API const char * const FLAC__StreamMetadata_Picture_TypeString[];
|
||
|
|
||
|
/** FLAC PICTURE structure. (See the
|
||
|
* <A HREF="../format.html#metadata_block_picture">format specification</A>
|
||
|
* for the full description of each field.)
|
||
|
*/
|
||
|
typedef struct {
|
||
|
FLAC__StreamMetadata_Picture_Type type;
|
||
|
/**< The kind of picture stored. */
|
||
|
|
||
|
char *mime_type;
|
||
|
/**< Picture data's MIME type, in ASCII printable characters
|
||
|
* 0x20-0x7e, NUL terminated. For best compatibility with players,
|
||
|
* use picture data of MIME type \c image/jpeg or \c image/png. A
|
||
|
* MIME type of '-->' is also allowed, in which case the picture
|
||
|
* data should be a complete URL. In file storage, the MIME type is
|
||
|
* stored as a 32-bit length followed by the ASCII string with no NUL
|
||
|
* terminator, but is converted to a plain C string in this structure
|
||
|
* for convenience.
|
||
|
*/
|
||
|
|
||
|
FLAC__byte *description;
|
||
|
/**< Picture's description in UTF-8, NUL terminated. In file storage,
|
||
|
* the description is stored as a 32-bit length followed by the UTF-8
|
||
|
* string with no NUL terminator, but is converted to a plain C string
|
||
|
* in this structure for convenience.
|
||
|
*/
|
||
|
|
||
|
FLAC__uint32 width;
|
||
|
/**< Picture's width in pixels. */
|
||
|
|
||
|
FLAC__uint32 height;
|
||
|
/**< Picture's height in pixels. */
|
||
|
|
||
|
FLAC__uint32 depth;
|
||
|
/**< Picture's color depth in bits-per-pixel. */
|
||
|
|
||
|
FLAC__uint32 colors;
|
||
|
/**< For indexed palettes (like GIF), picture's number of colors (the
|
||
|
* number of palette entries), or \c 0 for non-indexed (i.e. 2^depth).
|
||
|
*/
|
||
|
|
||
|
FLAC__uint32 data_length;
|
||
|
/**< Length of binary picture data in bytes. */
|
||
|
|
||
|
FLAC__byte *data;
|
||
|
/**< Binary picture data. */
|
||
|
|
||
|
} FLAC__StreamMetadata_Picture;
|
||
|
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_TYPE_LEN; /**< == 32 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN; /**< == 32 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN; /**< == 32 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN; /**< == 32 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN; /**< == 32 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN; /**< == 32 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_COLORS_LEN; /**< == 32 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN; /**< == 32 (bits) */
|
||
|
|
||
|
|
||
|
/** Structure that is used when a metadata block of unknown type is loaded.
|
||
|
* The contents are opaque. The structure is used only internally to
|
||
|
* correctly handle unknown metadata.
|
||
|
*/
|
||
|
typedef struct {
|
||
|
FLAC__byte *data;
|
||
|
} FLAC__StreamMetadata_Unknown;
|
||
|
|
||
|
|
||
|
/** FLAC metadata block structure. (c.f. <A HREF="../format.html#metadata_block">format specification</A>)
|
||
|
*/
|
||
|
typedef struct {
|
||
|
FLAC__MetadataType type;
|
||
|
/**< The type of the metadata block; used determine which member of the
|
||
|
* \a data union to dereference. If type >= FLAC__METADATA_TYPE_UNDEFINED
|
||
|
* then \a data.unknown must be used. */
|
||
|
|
||
|
FLAC__bool is_last;
|
||
|
/**< \c true if this metadata block is the last, else \a false */
|
||
|
|
||
|
unsigned length;
|
||
|
/**< Length, in bytes, of the block data as it appears in the stream. */
|
||
|
|
||
|
union {
|
||
|
FLAC__StreamMetadata_StreamInfo stream_info;
|
||
|
FLAC__StreamMetadata_Padding padding;
|
||
|
FLAC__StreamMetadata_Application application;
|
||
|
FLAC__StreamMetadata_SeekTable seek_table;
|
||
|
FLAC__StreamMetadata_VorbisComment vorbis_comment;
|
||
|
FLAC__StreamMetadata_CueSheet cue_sheet;
|
||
|
FLAC__StreamMetadata_Picture picture;
|
||
|
FLAC__StreamMetadata_Unknown unknown;
|
||
|
} data;
|
||
|
/**< Polymorphic block data; use the \a type value to determine which
|
||
|
* to use. */
|
||
|
} FLAC__StreamMetadata;
|
||
|
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_IS_LAST_LEN; /**< == 1 (bit) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_TYPE_LEN; /**< == 7 (bits) */
|
||
|
extern FLAC_API const unsigned FLAC__STREAM_METADATA_LENGTH_LEN; /**< == 24 (bits) */
|
||
|
|
||
|
/** The total stream length of a metadata block header in bytes. */
|
||
|
#define FLAC__STREAM_METADATA_HEADER_LENGTH (4u)
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
|
||
|
|
||
|
/*****************************************************************************
|
||
|
*
|
||
|
* Utility functions
|
||
|
*
|
||
|
*****************************************************************************/
|
||
|
|
||
|
/** Tests that a sample rate is valid for FLAC.
|
||
|
*
|
||
|
* \param sample_rate The sample rate to test for compliance.
|
||
|
* \retval FLAC__bool
|
||
|
* \c true if the given sample rate conforms to the specification, else
|
||
|
* \c false.
|
||
|
*/
|
||
|
FLAC_API FLAC__bool FLAC__format_sample_rate_is_valid(unsigned sample_rate);
|
||
|
|
||
|
/** Tests that a blocksize at the given sample rate is valid for the FLAC
|
||
|
* subset.
|
||
|
*
|
||
|
* \param blocksize The blocksize to test for compliance.
|
||
|
* \param sample_rate The sample rate is needed, since the valid subset
|
||
|
* blocksize depends on the sample rate.
|
||
|
* \retval FLAC__bool
|
||
|
* \c true if the given blocksize conforms to the specification for the
|
||
|
* subset at the given sample rate, else \c false.
|
||
|
*/
|
||
|
FLAC_API FLAC__bool FLAC__format_blocksize_is_subset(unsigned blocksize, unsigned sample_rate);
|
||
|
|
||
|
/** Tests that a sample rate is valid for the FLAC subset. The subset rules
|
||
|
* for valid sample rates are slightly more complex since the rate has to
|
||
|
* be expressible completely in the frame header.
|
||
|
*
|
||
|
* \param sample_rate The sample rate to test for compliance.
|
||
|
* \retval FLAC__bool
|
||
|
* \c true if the given sample rate conforms to the specification for the
|
||
|
* subset, else \c false.
|
||
|
*/
|
||
|
FLAC_API FLAC__bool FLAC__format_sample_rate_is_subset(unsigned sample_rate);
|
||
|
|
||
|
/** Check a Vorbis comment entry name to see if it conforms to the Vorbis
|
||
|
* comment specification.
|
||
|
*
|
||
|
* Vorbis comment names must be composed only of characters from
|
||
|
* [0x20-0x3C,0x3E-0x7D].
|
||
|
*
|
||
|
* \param name A NUL-terminated string to be checked.
|
||
|
* \assert
|
||
|
* \code name != NULL \endcode
|
||
|
* \retval FLAC__bool
|
||
|
* \c false if entry name is illegal, else \c true.
|
||
|
*/
|
||
|
FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_name_is_legal(const char *name);
|
||
|
|
||
|
/** Check a Vorbis comment entry value to see if it conforms to the Vorbis
|
||
|
* comment specification.
|
||
|
*
|
||
|
* Vorbis comment values must be valid UTF-8 sequences.
|
||
|
*
|
||
|
* \param value A string to be checked.
|
||
|
* \param length A the length of \a value in bytes. May be
|
||
|
* \c (unsigned)(-1) to indicate that \a value is a plain
|
||
|
* UTF-8 NUL-terminated string.
|
||
|
* \assert
|
||
|
* \code value != NULL \endcode
|
||
|
* \retval FLAC__bool
|
||
|
* \c false if entry name is illegal, else \c true.
|
||
|
*/
|
||
|
FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_value_is_legal(const FLAC__byte *value, unsigned length);
|
||
|
|
||
|
/** Check a Vorbis comment entry to see if it conforms to the Vorbis
|
||
|
* comment specification.
|
||
|
*
|
||
|
* Vorbis comment entries must be of the form 'name=value', and 'name' and
|
||
|
* 'value' must be legal according to
|
||
|
* FLAC__format_vorbiscomment_entry_name_is_legal() and
|
||
|
* FLAC__format_vorbiscomment_entry_value_is_legal() respectively.
|
||
|
*
|
||
|
* \param entry An entry to be checked.
|
||
|
* \param length The length of \a entry in bytes.
|
||
|
* \assert
|
||
|
* \code value != NULL \endcode
|
||
|
* \retval FLAC__bool
|
||
|
* \c false if entry name is illegal, else \c true.
|
||
|
*/
|
||
|
FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_is_legal(const FLAC__byte *entry, unsigned length);
|
||
|
|
||
|
/** Check a seek table to see if it conforms to the FLAC specification.
|
||
|
* See the format specification for limits on the contents of the
|
||
|
* seek table.
|
||
|
*
|
||
|
* \param seek_table A pointer to a seek table to be checked.
|
||
|
* \assert
|
||
|
* \code seek_table != NULL \endcode
|
||
|
* \retval FLAC__bool
|
||
|
* \c false if seek table is illegal, else \c true.
|
||
|
*/
|
||
|
FLAC_API FLAC__bool FLAC__format_seektable_is_legal(const FLAC__StreamMetadata_SeekTable *seek_table);
|
||
|
|
||
|
/** Sort a seek table's seek points according to the format specification.
|
||
|
* This includes a "unique-ification" step to remove duplicates, i.e.
|
||
|
* seek points with identical \a sample_number values. Duplicate seek
|
||
|
* points are converted into placeholder points and sorted to the end of
|
||
|
* the table.
|
||
|
*
|
||
|
* \param seek_table A pointer to a seek table to be sorted.
|
||
|
* \assert
|
||
|
* \code seek_table != NULL \endcode
|
||
|
* \retval unsigned
|
||
|
* The number of duplicate seek points converted into placeholders.
|
||
|
*/
|
||
|
FLAC_API unsigned FLAC__format_seektable_sort(FLAC__StreamMetadata_SeekTable *seek_table);
|
||
|
|
||
|
/** 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 cue_sheet A pointer to an existing cue sheet to be checked.
|
||
|
* \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 cue_sheet != NULL \endcode
|
||
|
* \retval FLAC__bool
|
||
|
* \c false if cue sheet is illegal, else \c true.
|
||
|
*/
|
||
|
FLAC_API FLAC__bool FLAC__format_cuesheet_is_legal(const FLAC__StreamMetadata_CueSheet *cue_sheet, FLAC__bool check_cd_da_subset, const char **violation);
|
||
|
|
||
|
/** Check picture data to see if it conforms to the FLAC specification.
|
||
|
* See the format specification for limits on the contents of the
|
||
|
* PICTURE block.
|
||
|
*
|
||
|
* \param picture A pointer to existing picture data 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 picture != NULL \endcode
|
||
|
* \retval FLAC__bool
|
||
|
* \c false if picture data is illegal, else \c true.
|
||
|
*/
|
||
|
FLAC_API FLAC__bool FLAC__format_picture_is_legal(const FLAC__StreamMetadata_Picture *picture, const char **violation);
|
||
|
|
||
|
/* \} */
|
||
|
|
||
|
#ifdef __cplusplus
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
#endif
|