| /* libFLAC - Free Lossless Audio Codec library |
| * Copyright (C) 2000,2001,2002 Josh Coalson |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| */ |
| |
| #ifndef FLAC__FORMAT_H |
| #define FLAC__FORMAT_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 XXX FLAC format XXX. 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 XXX metadata XXX module |
| * 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 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 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 XXX format.html XXX as to why. |
| */ |
| #define FLAC__MAX_SAMPLE_RATE (655350u) |
| |
| /** The maximum LPC order permitted by the format. */ |
| #define FLAC__MAX_LPC_ORDER (32u) |
| |
| /** The minimum quantized linear predictor coefficient precision |
| * permitted by the format. |
| */ |
| #define FLAC__MIN_QLP_COEFF_PRECISION (5u) |
| |
| /** 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) |
| |
| /* VERSION should come from configure */ |
| #ifdef VERSION |
| /** The version string of the current library. |
| * |
| * \note |
| * This does not correspond to the shared library version number, which |
| * is used to determine binary compatibility. |
| */ |
| #define FLAC__VERSION_STRING VERSION |
| #endif |
| |
| /** The byte string representation of the beginning of a FLAC stream. */ |
| extern const FLAC__byte FLAC__STREAM_SYNC_STRING[4]; /* = "fLaC" */; |
| |
| /** The 32-bit integer big-endian representation of the beginning of |
| * a FLAC stream. |
| */ |
| extern const unsigned FLAC__STREAM_SYNC; /* = 0x664C6143 */; |
| |
| /** The length of the FLAC signature in bits. */ |
| extern const unsigned FLAC__STREAM_SYNC_LEN; /* = 32 bits */; |
| |
| /** The length of the FLAC signature in bytes. */ |
| #define FLAC__STREAM_SYNC_LENGTH (4u) |
| |
| |
| /***************************************************************************** |
| * @@@ REMOVE? |
| * NOTE: Within the bitstream, all fixed-width numbers are big-endian coded. |
| * All numbers are unsigned unless otherwise noted. |
| * |
| *****************************************************************************/ |
| |
| |
| /***************************************************************************** |
| * |
| * 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 |
| * 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 const char * const FLAC__EntropyCodingMethodTypeString[]; |
| |
| |
| /** Header for a Rice partition. (XXX format XXX) |
| */ |
| typedef struct { |
| |
| unsigned order; |
| /**< The partition order, i.e. # of contexts = 2 ** order. */ |
| |
| unsigned parameters[1 << FLAC__MAX_RICE_PARTITION_ORDER]; |
| /**< The Rice parameters for each context. */ |
| |
| unsigned raw_bits[1 << FLAC__MAX_RICE_PARTITION_ORDER]; |
| /**< Widths for escape-coded partitions. */ |
| |
| } FLAC__EntropyCodingMethod_PartitionedRice; |
| |
| extern const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN; /**< == 4 (bits) */ |
| extern const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN; /**< == 4 (bits) */ |
| extern const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN; /**< == 5 (bits) */ |
| |
| extern const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER; |
| /**< == (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN)-1 */ |
| |
| /** Header for the entropy coding method. (XXX format XXX) |
| */ |
| typedef struct { |
| FLAC__EntropyCodingMethodType type; |
| union { |
| FLAC__EntropyCodingMethod_PartitionedRice partitioned_rice; |
| } data; |
| } FLAC__EntropyCodingMethod; |
| |
| extern 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 const char * const FLAC__SubframeTypeString[]; |
| |
| |
| /** CONSTANT subframe. (XXX format XXX) |
| */ |
| typedef struct { |
| FLAC__int32 value; /**< The constant signal value. */ |
| } FLAC__Subframe_Constant; |
| |
| |
| /** VERBATIM subframe. (XXX format XXX) |
| */ |
| typedef struct { |
| const FLAC__int32 *data; /**< A pointer to verbatim signal. */ |
| } FLAC__Subframe_Verbatim; |
| |
| |
| /** FIXED subframe. (XXX format XXX) |
| */ |
| 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. (XXX format XXX) |
| */ |
| 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 const unsigned FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN; /**< == 4 (bits) */ |
| extern const unsigned FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN; /**< == 5 (bits) */ |
| |
| |
| /** FLAC subframe structure. (XXX format XXX) |
| */ |
| 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; |
| |
| extern const unsigned FLAC__SUBFRAME_ZERO_PAD_LEN; /**< == 1 (bit) */ |
| extern const unsigned FLAC__SUBFRAME_TYPE_LEN; /**< == 6 (bits) */ |
| extern const unsigned FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN; /**< == 1 (bit) */ |
| |
| extern const unsigned FLAC__SUBFRAME_TYPE_CONSTANT_BYTE_ALIGNED_MASK; /* = 0x00 */ |
| extern const unsigned FLAC__SUBFRAME_TYPE_VERBATIM_BYTE_ALIGNED_MASK; /* = 0x02 */ |
| extern const unsigned FLAC__SUBFRAME_TYPE_FIXED_BYTE_ALIGNED_MASK; /* = 0x10 */ |
| extern 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 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 const char * const FLAC__FrameNumberTypeString[]; |
| |
| |
| /** FLAC frame header structure. (XXX format XXX) |
| */ |
| 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. */ |
| |
| 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 const unsigned FLAC__FRAME_HEADER_SYNC; /**< == 0x3ffe; the frame header sync code */ |
| extern const unsigned FLAC__FRAME_HEADER_SYNC_LEN; /**< == 14 (bits) */ |
| extern const unsigned FLAC__FRAME_HEADER_RESERVED_LEN; /**< == 2 (bits) */ |
| extern const unsigned FLAC__FRAME_HEADER_BLOCK_SIZE_LEN; /**< == 4 (bits) */ |
| extern const unsigned FLAC__FRAME_HEADER_SAMPLE_RATE_LEN; /**< == 4 (bits) */ |
| extern const unsigned FLAC__FRAME_HEADER_CHANNEL_ASSIGNMENT_LEN; /**< == 4 (bits) */ |
| extern const unsigned FLAC__FRAME_HEADER_BITS_PER_SAMPLE_LEN; /**< == 3 (bits) */ |
| extern const unsigned FLAC__FRAME_HEADER_ZERO_PAD_LEN; /**< == 1 (bit) */ |
| extern const unsigned FLAC__FRAME_HEADER_CRC_LEN; /**< == 8 (bits) */ |
| |
| |
| /** FLAC frame footer structure. (XXX format XXX) |
| */ |
| 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 const unsigned FLAC__FRAME_FOOTER_CRC_LEN; /**< == 16 (bits) */ |
| |
| |
| /** FLAC frame structure. (XXX format XXX) |
| */ |
| 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, |
| FLAC__METADATA_TYPE_PADDING = 1, |
| FLAC__METADATA_TYPE_APPLICATION = 2, |
| FLAC__METADATA_TYPE_SEEKTABLE = 3, |
| FLAC__METADATA_TYPE_VORBIS_COMMENT = 4 |
| } 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 const char * const FLAC__MetadataTypeString[]; |
| |
| /** FLAC STREAMINFO structure. (XXX format XXX) |
| */ |
| 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 const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN; /**< == 16 (bits) */ |
| extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN; /**< == 16 (bits) */ |
| extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN; /**< == 24 (bits) */ |
| extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN; /**< == 24 (bits) */ |
| extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN; /**< == 20 (bits) */ |
| extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN; /**< == 3 (bits) */ |
| extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN; /**< == 5 (bits) */ |
| extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN; /**< == 36 (bits) */ |
| extern 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. (XXX format XXX) |
| */ |
| 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. (XXX format XXX) |
| */ |
| typedef struct { |
| FLAC__byte id[4]; |
| FLAC__byte *data; |
| } FLAC__StreamMetadata_Application; |
| |
| extern const unsigned FLAC__STREAM_METADATA_APPLICATION_ID_LEN; /**< == 32 (bits) */ |
| |
| /** SeekPoint structure used in SEEKTABLE blocks. (XXX format XXX) |
| */ |
| 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 const unsigned FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN; /**< == 64 (bits) */ |
| extern const unsigned FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN; /**< == 64 (bits) */ |
| extern 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 const FLAC__uint64 FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER; |
| |
| |
| /** FLAC SEEKTABLE structure. (XXX format XXX) |
| * |
| * \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. (XXX format XXX) |
| */ |
| typedef struct { |
| FLAC__uint32 length; |
| FLAC__byte *entry; |
| } FLAC__StreamMetadata_VorbisComment_Entry; |
| |
| extern const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN; /**< == 32 (bits) */ |
| |
| |
| /** FLAC VORBIS_COMMENT structure. (XXX format XXX) |
| */ |
| typedef struct { |
| FLAC__StreamMetadata_VorbisComment_Entry vendor_string; |
| FLAC__uint32 num_comments; |
| FLAC__StreamMetadata_VorbisComment_Entry *comments; |
| } FLAC__StreamMetadata_VorbisComment; |
| |
| extern const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN; /**< == 32 (bits) */ |
| |
| |
| /***************************************************************************** |
| * |
| * 1: =1 if this is the last meta-data block, else =0 |
| * 7: meta-data type (c.f. FLAC__MetadataType) |
| * 24: length (in bytes) of the block-specific data to follow |
| *---- ----------------- |
| * 4 bytes total |
| */ |
| typedef struct { |
| FLAC__MetadataType type; |
| /**< The type of the metadata block; used determine which member of the |
| * \a data union to dereference. */ |
| |
| 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; |
| } data; |
| /**< Polymorphic block data; use the \a type value to determine which |
| * to use. */ |
| } FLAC__StreamMetadata; |
| |
| extern const unsigned FLAC__STREAM_METADATA_IS_LAST_LEN; /**< == 1 (bit) */ |
| extern const unsigned FLAC__STREAM_METADATA_TYPE_LEN; /**< == 7 (bits) */ |
| extern 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. Since the rules for valid |
| * sample rates are slightly complex, they are encapsulated in this function. |
| * |
| * \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__bool FLAC__format_sample_rate_is_valid(unsigned sample_rate); |
| |
| /** Check a seektable to see if it conforms to the FLAC specification. |
| * See the format specification for limits on the contents of the |
| * seektable. |
| * |
| * \param object A pointer to a seek table to be checked. |
| * \assert |
| * \code object != NULL \endcode |
| * \retval FLAC__bool |
| * \c false if seek table is illegal, else \c true. |
| */ |
| FLAC__bool FLAC__format_seektable_is_legal(const FLAC__StreamMetadata_SeekTable *object); |
| |
| /* \} */ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif |