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/* libFLAC - Free Lossless Audio Codec library

 * Copyright (C) 2000-2009  Josh Coalson

 * Copyright (C) 2011-2016  Xiph.Org Foundation

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 * notice, this list of conditions and the following disclaimer.

 *

 * - Redistributions in binary form must reproduce the above copyright

 * notice, this list of conditions and the following disclaimer in the

 * documentation and/or other materials provided with the distribution.

 *

 * - Neither the name of the Xiph.org Foundation nor the names of its

 * contributors may be used to endorse or promote products derived from

 * this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#ifndef FLAC__FORMAT_H

#define FLAC__FORMAT_H

#include "export.h"

#include "ordinals.h"

#ifdef __cplusplus

extern "C" {

#endif

/** \file include/FLAC/format.h

 *

 *  \brief

 *  This module contains structure definitions for the representation

 *  of FLAC format components in memory.  These are the basic

 *  structures used by the rest of the interfaces.

 *

 *  See the detailed documentation in the

 *  \link flac_format format \endlink module.

 */

/** \defgroup flac_format FLAC/format.h: format components

 *  \ingroup flac

 *

 *  \brief

 *  This module contains structure definitions for the representation

 *  of FLAC format components in memory.  These are the basic

 *  structures used by the rest of the interfaces.

 *

 *  First, you should be familiar with the

 *  <A HREF="../format.html">FLAC format</A>.  Many of the values here

 *  follow directly from the specification.  As a user of libFLAC, the

 *  interesting parts really are the structures that describe the frame

 *  header and metadata blocks.

 *

 *  The format structures here are very primitive, designed to store

 *  information in an efficient way.  Reading information from the

 *  structures is easy but creating or modifying them directly is

 *  more complex.  For the most part, as a user of a library, editing

 *  is not necessary; however, for metadata blocks it is, so there are

 *  convenience functions provided in the \link flac_metadata metadata

 *  module \endlink to simplify the manipulation of metadata blocks.

 *

 * \note

 * It's not the best convention, but symbols ending in _LEN are in bits

 * and _LENGTH are in bytes.  _LENGTH symbols are \#defines instead of

 * global variables because they are usually used when declaring byte

 * arrays and some compilers require compile-time knowledge of array

 * sizes when declared on the stack.

 *

 * \{

 */

/*

        Most of the values described in this file are defined by the FLAC

        format specification.  There is nothing to tune here.

*/

/** The largest legal metadata type code. */

#define FLAC__MAX_METADATA_TYPE_CODE (126u)

/** The minimum block size, in samples, permitted by the format. */

#define FLAC__MIN_BLOCK_SIZE (16u)

/** The maximum block size, in samples, permitted by the format. */

#define FLAC__MAX_BLOCK_SIZE (65535u)

/** The maximum block size, in samples, permitted by the FLAC subset for

 *  sample rates up to 48kHz. */

#define FLAC__SUBSET_MAX_BLOCK_SIZE_48000HZ (4608u)

/** The maximum number of channels permitted by the format. */

#define FLAC__MAX_CHANNELS (8u)

/** The minimum sample resolution permitted by the format. */

#define FLAC__MIN_BITS_PER_SAMPLE (4u)

/** The maximum sample resolution permitted by the format. */

#define FLAC__MAX_BITS_PER_SAMPLE (32u)

/** The maximum sample resolution permitted by libFLAC.

 *

 * \warning

 * FLAC__MAX_BITS_PER_SAMPLE is the limit of the FLAC format.  However,

 * the reference encoder/decoder is currently limited to 24 bits because

 * of prevalent 32-bit math, so make sure and use this value when

 * appropriate.

 */

#define FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE (24u)

/** The maximum sample rate permitted by the format.  The value is

 *  ((2 ^ 16) - 1) * 10; see <A HREF="../format.html">FLAC format</A>

 *  as to why.

 */

#define FLAC__MAX_SAMPLE_RATE (655350u)

/** The maximum LPC order permitted by the format. */

#define FLAC__MAX_LPC_ORDER (32u)

/** The maximum LPC order permitted by the FLAC subset for sample rates

 *  up to 48kHz. */

#define FLAC__SUBSET_MAX_LPC_ORDER_48000HZ (12u)

/** The minimum quantized linear predictor coefficient precision

 *  permitted by the format.

 */

#define FLAC__MIN_QLP_COEFF_PRECISION (5u)

/** The maximum quantized linear predictor coefficient precision

 *  permitted by the format.

 */

#define FLAC__MAX_QLP_COEFF_PRECISION (15u)

/** The maximum order of the fixed predictors permitted by the format. */

#define FLAC__MAX_FIXED_ORDER (4u)

/** The maximum Rice partition order permitted by the format. */

#define FLAC__MAX_RICE_PARTITION_ORDER (15u)

/** The maximum Rice partition order permitted by the FLAC Subset. */

#define FLAC__SUBSET_MAX_RICE_PARTITION_ORDER (8u)

/** The version string of the release, stamped onto the libraries and binaries.

 *

 * \note

 * This does not correspond to the shared library version number, which

 * is used to determine binary compatibility.

 */

extern FLAC_API const char *FLAC__VERSION_STRING;

/** The vendor string inserted by the encoder into the VORBIS_COMMENT block.

 *  This is a NUL-terminated ASCII string; when inserted into the

 *  VORBIS_COMMENT the trailing null is stripped.

 */

extern FLAC_API const char *FLAC__VENDOR_STRING;

/** The byte string representation of the beginning of a FLAC stream. */

extern FLAC_API const FLAC__byte FLAC__STREAM_SYNC_STRING[4]; /* = "fLaC" */

/** The 32-bit integer big-endian representation of the beginning of

 *  a FLAC stream.

 */

extern FLAC_API const unsigned FLAC__STREAM_SYNC; /* = 0x664C6143 */

/** The length of the FLAC signature in bits. */

extern FLAC_API const unsigned FLAC__STREAM_SYNC_LEN; /* = 32 bits */

/** The length of the FLAC signature in bytes. */

#define FLAC__STREAM_SYNC_LENGTH (4u)

/*****************************************************************************

 *

 * Subframe structures

 *

 *****************************************************************************/

/*****************************************************************************/

/** An enumeration of the available entropy coding methods. */

typedef enum {

        FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE = 0,

        /**< Residual is coded by partitioning into contexts, each with it's own

         * 4-bit Rice parameter. */

        FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2 = 1

        /**< Residual is coded by partitioning into contexts, each with it's own

         * 5-bit Rice parameter. */

} FLAC__EntropyCodingMethodType;

/** Maps a FLAC__EntropyCodingMethodType to a C string.

 *

 *  Using a FLAC__EntropyCodingMethodType as the index to this array will

 *  give the string equivalent.  The contents should not be modified.

 */

extern FLAC_API const char * const FLAC__EntropyCodingMethodTypeString[];

/** Contents of a Rice partitioned residual

 */

typedef struct {

        unsigned *parameters;

        /**< The Rice parameters for each context. */

        unsigned *raw_bits;

        /**< Widths for escape-coded partitions.  Will be non-zero for escaped

         * partitions and zero for unescaped partitions.

         */

        unsigned capacity_by_order;

        /**< The capacity of the \a parameters and \a raw_bits arrays

         * specified as an order, i.e. the number of array elements

         * allocated is 2 ^ \a capacity_by_order.

         */

} FLAC__EntropyCodingMethod_PartitionedRiceContents;

/** Header for a Rice partitioned residual.  (c.f. <A HREF="../format.html#partitioned_rice">format specification</A>)

 */

typedef struct {

        unsigned order;

        /**< The partition order, i.e. # of contexts = 2 ^ \a order. */

        const FLAC__EntropyCodingMethod_PartitionedRiceContents *contents;

        /**< The context's Rice parameters and/or raw bits. */

} FLAC__EntropyCodingMethod_PartitionedRice;

extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN; /**< == 4 (bits) */

extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN; /**< == 4 (bits) */

extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN; /**< == 5 (bits) */

extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN; /**< == 5 (bits) */

extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;

/**< == (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN)-1 */

extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER;

/**< == (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN)-1 */

/** Header for the entropy coding method.  (c.f. <A HREF="../format.html#residual">format specification</A>)

 */

typedef struct {

        FLAC__EntropyCodingMethodType type;

        union {

                FLAC__EntropyCodingMethod_PartitionedRice partitioned_rice;

        } data;

} FLAC__EntropyCodingMethod;

extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_TYPE_LEN; /**< == 2 (bits) */

/*****************************************************************************/

/** An enumeration of the available subframe types. */

typedef enum {

        FLAC__SUBFRAME_TYPE_CONSTANT = 0, /**< constant signal */

        FLAC__SUBFRAME_TYPE_VERBATIM = 1, /**< uncompressed signal */

        FLAC__SUBFRAME_TYPE_FIXED = 2, /**< fixed polynomial prediction */

        FLAC__SUBFRAME_TYPE_LPC = 3 /**< linear prediction */

} FLAC__SubframeType;

/** Maps a FLAC__SubframeType to a C string.

 *

 *  Using a FLAC__SubframeType as the index to this array will

 *  give the string equivalent.  The contents should not be modified.

 */

extern FLAC_API const char * const FLAC__SubframeTypeString[];

/** CONSTANT subframe.  (c.f. <A HREF="../format.html#subframe_constant">format specification</A>)

 */

typedef struct {

        FLAC__int32 value; /**< The constant signal value. */

} FLAC__Subframe_Constant;

/** VERBATIM subframe.  (c.f. <A HREF="../format.html#subframe_verbatim">format specification</A>)

 */

typedef struct {

        const FLAC__int32 *data; /**< A pointer to verbatim signal. */

} FLAC__Subframe_Verbatim;

/** FIXED subframe.  (c.f. <A HREF="../format.html#subframe_fixed">format specification</A>)

 */

typedef struct {

        FLAC__EntropyCodingMethod entropy_coding_method;

        /**< The residual coding method. */

        unsigned order;

        /**< The polynomial order. */

        FLAC__int32 warmup[FLAC__MAX_FIXED_ORDER];

        /**< Warmup samples to prime the predictor, length == order. */

        const FLAC__int32 *residual;

        /**< The residual signal, length == (blocksize minus order) samples. */

} FLAC__Subframe_Fixed;

/** LPC subframe.  (c.f. <A HREF="../format.html#subframe_lpc">format specification</A>)

 */

typedef struct {

        FLAC__EntropyCodingMethod entropy_coding_method;

        /**< The residual coding method. */

        unsigned order;

        /**< The FIR order. */

        unsigned qlp_coeff_precision;

        /**< Quantized FIR filter coefficient precision in bits. */

        int quantization_level;

        /**< The qlp coeff shift needed. */

        FLAC__int32 qlp_coeff[FLAC__MAX_LPC_ORDER];

        /**< FIR filter coefficients. */

        FLAC__int32 warmup[FLAC__MAX_LPC_ORDER];

        /**< Warmup samples to prime the predictor, length == order. */

        const FLAC__int32 *residual;

        /**< The residual signal, length == (blocksize minus order) samples. */

} FLAC__Subframe_LPC;

extern FLAC_API const unsigned FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN; /**< == 4 (bits) */

extern FLAC_API const unsigned FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN; /**< == 5 (bits) */

/** FLAC subframe structure.  (c.f. <A HREF="../format.html#subframe">format specification</A>)

 */

typedef struct {

        FLAC__SubframeType type;

        union {

                FLAC__Subframe_Constant constant;

                FLAC__Subframe_Fixed fixed;

                FLAC__Subframe_LPC lpc;

                FLAC__Subframe_Verbatim verbatim;

        } data;

        unsigned wasted_bits;

} FLAC__Subframe;

/** == 1 (bit)

 *

 * This used to be a zero-padding bit (hence the name

 * FLAC__SUBFRAME_ZERO_PAD_LEN) but is now a reserved bit.  It still has a

 * mandatory value of \c 0 but in the future may take on the value \c 0 or \c 1

 * to mean something else.

 */

extern FLAC_API const unsigned FLAC__SUBFRAME_ZERO_PAD_LEN;

extern FLAC_API const unsigned FLAC__SUBFRAME_TYPE_LEN; /**< == 6 (bits) */

extern FLAC_API const unsigned FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN; /**< == 1 (bit) */

extern FLAC_API const unsigned FLAC__SUBFRAME_TYPE_CONSTANT_BYTE_ALIGNED_MASK; /**< = 0x00 */

extern FLAC_API const unsigned FLAC__SUBFRAME_TYPE_VERBATIM_BYTE_ALIGNED_MASK; /**< = 0x02 */

extern FLAC_API const unsigned FLAC__SUBFRAME_TYPE_FIXED_BYTE_ALIGNED_MASK; /**< = 0x10 */

extern FLAC_API const unsigned FLAC__SUBFRAME_TYPE_LPC_BYTE_ALIGNED_MASK; /**< = 0x40 */

/*****************************************************************************/

/*****************************************************************************

 *

 * Frame structures

 *

 *****************************************************************************/

/** An enumeration of the available channel assignments. */

typedef enum {

        FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT = 0, /**< independent channels */

        FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE = 1, /**< left+side stereo */

        FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE = 2, /**< right+side stereo */

        FLAC__CHANNEL_ASSIGNMENT_MID_SIDE = 3 /**< mid+side stereo */

} FLAC__ChannelAssignment;

/** Maps a FLAC__ChannelAssignment to a C string.

 *

 *  Using a FLAC__ChannelAssignment as the index to this array will

 *  give the string equivalent.  The contents should not be modified.

 */

extern FLAC_API const char * const FLAC__ChannelAssignmentString[];

/** An enumeration of the possible frame numbering methods. */

typedef enum {

        FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER, /**< number contains the frame number */

        FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER /**< number contains the sample number of first sample in frame */

} FLAC__FrameNumberType;

/** Maps a FLAC__FrameNumberType to a C string.

 *

 *  Using a FLAC__FrameNumberType as the index to this array will

 *  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__MAX_METADATA_TYPE = FLAC__MAX_METADATA_TYPE_CODE,

        /**< No type will ever be greater than this. There is not enough room in the protocol block. */

} 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