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# include/FLAC/format.h

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    00001 /* libFLAC - Free Lossless Audio Codec library
    00002  * Copyright (C) 2000,2001,2002,2003,2004,2005  Josh Coalson
    00003  *
    00004  * Redistribution and use in source and binary forms, with or without
    00005  * modification, are permitted provided that the following conditions
    00006  * are met:
    00007  *
    00008  * - Redistributions of source code must retain the above copyright
    00009  * notice, this list of conditions and the following disclaimer.
    00010  *
    00011  * - Redistributions in binary form must reproduce the above copyright
    00012  * notice, this list of conditions and the following disclaimer in the
    00013  * documentation and/or other materials provided with the distribution.
    00014  *
    00015  * - Neither the name of the Xiph.org Foundation nor the names of its
    00016  * contributors may be used to endorse or promote products derived from
    00017  * this software without specific prior written permission.
    00018  *
    00019  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    00020  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    00021  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    00022  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
    00023  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
    00024  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    00025  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    00026  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
    00027  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
    00028  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    00029  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    00030  */
    00031
    00032 #ifndef FLAC__FORMAT_H
    00033 #define FLAC__FORMAT_H
    00034
    00035 #include "export.h"
    00036 #include "ordinals.h"
    00037
    00038 #ifdef __cplusplus
    00039 extern "C" {
    00040 #endif
    00041
    00086 /*
    00087     Most of the values described in this file are defined by the FLAC
    00088     format specification.  There is nothing to tune here.
    00089 */
    00090
    00092 #define FLAC__MAX_METADATA_TYPE_CODE (126u)
    00093
    00095 #define FLAC__MIN_BLOCK_SIZE (16u)
    00096
    00098 #define FLAC__MAX_BLOCK_SIZE (65535u)
    00099
    00101 #define FLAC__MAX_CHANNELS (8u)
    00102
    00104 #define FLAC__MIN_BITS_PER_SAMPLE (4u)
    00105
    00107 #define FLAC__MAX_BITS_PER_SAMPLE (32u)
    00108
    00117 #define FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE (24u)
    00118
    00123 #define FLAC__MAX_SAMPLE_RATE (655350u)
    00124
    00126 #define FLAC__MAX_LPC_ORDER (32u)
    00127
    00131 #define FLAC__MIN_QLP_COEFF_PRECISION (5u)
    00132
    00136 #define FLAC__MAX_QLP_COEFF_PRECISION (15u)
    00137
    00139 #define FLAC__MAX_FIXED_ORDER (4u)
    00140
    00142 #define FLAC__MAX_RICE_PARTITION_ORDER (15u)
    00143
    00145 #define FLAC__SUBSET_MAX_RICE_PARTITION_ORDER (8u)
    00146
    00153 extern FLAC_API const char *FLAC__VERSION_STRING;
    00154
    00159 extern FLAC_API const char *FLAC__VENDOR_STRING;
    00160
    00162 extern FLAC_API const FLAC__byte FLAC__STREAM_SYNC_STRING[4]; /* = "fLaC" */
    00163
    00167 extern FLAC_API const unsigned FLAC__STREAM_SYNC; /* = 0x664C6143 */
    00168
    00170 extern FLAC_API const unsigned FLAC__STREAM_SYNC_LEN; /* = 32 bits */
    00171
    00173 #define FLAC__STREAM_SYNC_LENGTH (4u)
    00174
    00175
    00176 /*****************************************************************************
    00177  *
    00178  * Subframe structures
    00179  *
    00180  *****************************************************************************/
    00181
    00182 /*****************************************************************************/
    00183
    00185 typedef enum {
    00186     FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE = 0
    00189 } FLAC__EntropyCodingMethodType;
    00190
    00196 extern FLAC_API const char * const FLAC__EntropyCodingMethodTypeString[];
    00197
    00198
    00201 typedef struct {
    00202
    00203     unsigned *parameters;
    00206     unsigned *raw_bits;
    00209     unsigned capacity_by_order;
    00214 } FLAC__EntropyCodingMethod_PartitionedRiceContents;
    00215
    00218 typedef struct {
    00219
    00220     unsigned order;
    00223     const FLAC__EntropyCodingMethod_PartitionedRiceContents *contents;
    00226 } FLAC__EntropyCodingMethod_PartitionedRice;
    00227
    00228 extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN;
    00229 extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
    00230 extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN;
    00232 extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
    00237 typedef struct {
    00238     FLAC__EntropyCodingMethodType type;
    00239     union {
    00240         FLAC__EntropyCodingMethod_PartitionedRice partitioned_rice;
    00241     } data;
    00242 } FLAC__EntropyCodingMethod;
    00243
    00244 extern FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_TYPE_LEN;
    00246 /*****************************************************************************/
    00247
    00249 typedef enum {
    00250     FLAC__SUBFRAME_TYPE_CONSTANT = 0,
    00251     FLAC__SUBFRAME_TYPE_VERBATIM = 1,
    00252     FLAC__SUBFRAME_TYPE_FIXED = 2,
    00253     FLAC__SUBFRAME_TYPE_LPC = 3
    00254 } FLAC__SubframeType;
    00255
    00261 extern FLAC_API const char * const FLAC__SubframeTypeString[];
    00262
    00263
    00266 typedef struct {
    00267     FLAC__int32 value;
    00268 } FLAC__Subframe_Constant;
    00269
    00270
    00273 typedef struct {
    00274     const FLAC__int32 *data;
    00275 } FLAC__Subframe_Verbatim;
    00276
    00277
    00280 typedef struct {
    00281     FLAC__EntropyCodingMethod entropy_coding_method;
    00284     unsigned order;
    00287     FLAC__int32 warmup[FLAC__MAX_FIXED_ORDER];
    00290     const FLAC__int32 *residual;
    00292 } FLAC__Subframe_Fixed;
    00293
    00294
    00297 typedef struct {
    00298     FLAC__EntropyCodingMethod entropy_coding_method;
    00301     unsigned order;
    00304     unsigned qlp_coeff_precision;
    00307     int quantization_level;
    00310     FLAC__int32 qlp_coeff[FLAC__MAX_LPC_ORDER];
    00313     FLAC__int32 warmup[FLAC__MAX_LPC_ORDER];
    00316     const FLAC__int32 *residual;
    00318 } FLAC__Subframe_LPC;
    00319
    00320 extern FLAC_API const unsigned FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN;
    00321 extern FLAC_API const unsigned FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN;
    00326 typedef struct {
    00327     FLAC__SubframeType type;
    00328     union {
    00329         FLAC__Subframe_Constant constant;
    00330         FLAC__Subframe_Fixed fixed;
    00331         FLAC__Subframe_LPC lpc;
    00332         FLAC__Subframe_Verbatim verbatim;
    00333     } data;
    00334     unsigned wasted_bits;
    00335 } FLAC__Subframe;
    00336
    00337 extern FLAC_API const unsigned FLAC__SUBFRAME_ZERO_PAD_LEN;
    00338 extern FLAC_API const unsigned FLAC__SUBFRAME_TYPE_LEN;
    00339 extern FLAC_API const unsigned FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN;
    00341 extern FLAC_API const unsigned FLAC__SUBFRAME_TYPE_CONSTANT_BYTE_ALIGNED_MASK; /* = 0x00 */
    00342 extern FLAC_API const unsigned FLAC__SUBFRAME_TYPE_VERBATIM_BYTE_ALIGNED_MASK; /* = 0x02 */
    00343 extern FLAC_API const unsigned FLAC__SUBFRAME_TYPE_FIXED_BYTE_ALIGNED_MASK; /* = 0x10 */
    00344 extern FLAC_API const unsigned FLAC__SUBFRAME_TYPE_LPC_BYTE_ALIGNED_MASK; /* = 0x40 */
    00345
    00346 /*****************************************************************************/
    00347
    00348
    00349 /*****************************************************************************
    00350  *
    00351  * Frame structures
    00352  *
    00353  *****************************************************************************/
    00354
    00356 typedef enum {
    00357     FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT = 0,
    00358     FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE = 1,
    00359     FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE = 2,
    00360     FLAC__CHANNEL_ASSIGNMENT_MID_SIDE = 3
    00361 } FLAC__ChannelAssignment;
    00362
    00368 extern FLAC_API const char * const FLAC__ChannelAssignmentString[];
    00369
    00371 typedef enum {
    00372     FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER,
    00373     FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER
    00374 } FLAC__FrameNumberType;
    00375
    00381 extern FLAC_API const char * const FLAC__FrameNumberTypeString[];
    00382
    00383
    00386 typedef struct {
    00387     unsigned blocksize;
    00390     unsigned sample_rate;
    00393     unsigned channels;
    00396     FLAC__ChannelAssignment channel_assignment;
    00399     unsigned bits_per_sample;
    00402     FLAC__FrameNumberType number_type;
    00405     union {
    00406         FLAC__uint32 frame_number;
    00407         FLAC__uint64 sample_number;
    00408     } number;
    00412     FLAC__uint8 crc;
    00417 } FLAC__FrameHeader;
    00418
    00419 extern FLAC_API const unsigned FLAC__FRAME_HEADER_SYNC;
    00420 extern FLAC_API const unsigned FLAC__FRAME_HEADER_SYNC_LEN;
    00421 extern FLAC_API const unsigned FLAC__FRAME_HEADER_RESERVED_LEN;
    00422 extern FLAC_API const unsigned FLAC__FRAME_HEADER_BLOCK_SIZE_LEN;
    00423 extern FLAC_API const unsigned FLAC__FRAME_HEADER_SAMPLE_RATE_LEN;
    00424 extern FLAC_API const unsigned FLAC__FRAME_HEADER_CHANNEL_ASSIGNMENT_LEN;
    00425 extern FLAC_API const unsigned FLAC__FRAME_HEADER_BITS_PER_SAMPLE_LEN;
    00426 extern FLAC_API const unsigned FLAC__FRAME_HEADER_ZERO_PAD_LEN;
    00427 extern FLAC_API const unsigned FLAC__FRAME_HEADER_CRC_LEN;
    00432 typedef struct {
    00433     FLAC__uint16 crc;
    00438 } FLAC__FrameFooter;
    00439
    00440 extern FLAC_API const unsigned FLAC__FRAME_FOOTER_CRC_LEN;
    00445 typedef struct {
    00446     FLAC__FrameHeader header;
    00447     FLAC__Subframe subframes[FLAC__MAX_CHANNELS];
    00448     FLAC__FrameFooter footer;
    00449 } FLAC__Frame;
    00450
    00451 /*****************************************************************************/
    00452
    00453
    00454 /*****************************************************************************
    00455  *
    00456  * Meta-data structures
    00457  *
    00458  *****************************************************************************/
    00459
    00461 typedef enum {
    00462
    00463     FLAC__METADATA_TYPE_STREAMINFO = 0,
    00466     FLAC__METADATA_TYPE_PADDING = 1,
    00469     FLAC__METADATA_TYPE_APPLICATION = 2,
    00472     FLAC__METADATA_TYPE_SEEKTABLE = 3,
    00475     FLAC__METADATA_TYPE_VORBIS_COMMENT = 4,
    00478     FLAC__METADATA_TYPE_CUESHEET = 5,
    00481     FLAC__METADATA_TYPE_UNDEFINED = 6
    00484 } FLAC__MetadataType;
    00485
    00491 extern FLAC_API const char * const FLAC__MetadataTypeString[];
    00492
    00493
    00496 typedef struct {
    00497     unsigned min_blocksize, max_blocksize;
    00498     unsigned min_framesize, max_framesize;
    00499     unsigned sample_rate;
    00500     unsigned channels;
    00501     unsigned bits_per_sample;
    00502     FLAC__uint64 total_samples;
    00503     FLAC__byte md5sum[16];
    00504 } FLAC__StreamMetadata_StreamInfo;
    00505
    00506 extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
    00507 extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
    00508 extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
    00509 extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
    00510 extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
    00511 extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
    00512 extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
    00513 extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
    00514 extern FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MD5SUM_LEN;
    00517 #define FLAC__STREAM_METADATA_STREAMINFO_LENGTH (34u)
    00518
    00521 typedef struct {
    00522     int dummy;
    00527 } FLAC__StreamMetadata_Padding;
    00528
    00529
    00532 typedef struct {
    00533     FLAC__byte id[4];
    00534     FLAC__byte *data;
    00535 } FLAC__StreamMetadata_Application;
    00536
    00537 extern FLAC_API const unsigned FLAC__STREAM_METADATA_APPLICATION_ID_LEN;
    00541 typedef struct {
    00542     FLAC__uint64 sample_number;
    00545     FLAC__uint64 stream_offset;
    00549     unsigned frame_samples;
    00551 } FLAC__StreamMetadata_SeekPoint;
    00552
    00553 extern FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN;
    00554 extern FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN;
    00555 extern FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN;
    00558 #define FLAC__STREAM_METADATA_SEEKPOINT_LENGTH (18u)
    00559
    00564 extern FLAC_API const FLAC__uint64 FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
    00565
    00566
    00579 typedef struct {
    00580     unsigned num_points;
    00581     FLAC__StreamMetadata_SeekPoint *points;
    00582 } FLAC__StreamMetadata_SeekTable;
    00583
    00584
    00591 typedef struct {
    00592     FLAC__uint32 length;
    00593     FLAC__byte *entry;
    00594 } FLAC__StreamMetadata_VorbisComment_Entry;
    00595
    00596 extern FLAC_API const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN;
    00601 typedef struct {
    00602     FLAC__StreamMetadata_VorbisComment_Entry vendor_string;
    00603     FLAC__uint32 num_comments;
    00604     FLAC__StreamMetadata_VorbisComment_Entry *comments;
    00605 } FLAC__StreamMetadata_VorbisComment;
    00606
    00607 extern FLAC_API const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN;
    00614 typedef struct {
    00615     FLAC__uint64 offset;
    00620     FLAC__byte number;
    00622 } FLAC__StreamMetadata_CueSheet_Index;
    00623
    00624 extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN;
    00625 extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN;
    00626 extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN;
    00633 typedef struct {
    00634     FLAC__uint64 offset;
    00637     FLAC__byte number;
    00640     char isrc[13];
    00643     unsigned type:1;
    00646     unsigned pre_emphasis:1;
    00649     FLAC__byte num_indices;
    00652     FLAC__StreamMetadata_CueSheet_Index *indices;
    00655 } FLAC__StreamMetadata_CueSheet_Track;
    00656
    00657 extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN;
    00658 extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN;
    00659 extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN;
    00660 extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN;
    00661 extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN;
    00662 extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN;
    00663 extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN;
    00670 typedef struct {
    00671     char media_catalog_number[129];
    00677     FLAC__uint64 lead_in;
    00680     FLAC__bool is_cd;
    00683     unsigned num_tracks;
    00686     FLAC__StreamMetadata_CueSheet_Track *tracks;
    00689 } FLAC__StreamMetadata_CueSheet;
    00690
    00691 extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN;
    00692 extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN;
    00693 extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN;
    00694 extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN;
    00695 extern FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN;
    00702 typedef struct {
    00703     FLAC__byte *data;
    00704 } FLAC__StreamMetadata_Unknown;
    00705
    00706
    00709 typedef struct {
    00710     FLAC__MetadataType type;
    00715     FLAC__bool is_last;
    00718     unsigned length;
    00721     union {
    00722         FLAC__StreamMetadata_StreamInfo stream_info;
    00723         FLAC__StreamMetadata_Padding padding;
    00724         FLAC__StreamMetadata_Application application;
    00725         FLAC__StreamMetadata_SeekTable seek_table;
    00726         FLAC__StreamMetadata_VorbisComment vorbis_comment;
    00727         FLAC__StreamMetadata_CueSheet cue_sheet;
    00728         FLAC__StreamMetadata_Unknown unknown;
    00729     } data;
    00732 } FLAC__StreamMetadata;
    00733
    00734 extern FLAC_API const unsigned FLAC__STREAM_METADATA_IS_LAST_LEN;
    00735 extern FLAC_API const unsigned FLAC__STREAM_METADATA_TYPE_LEN;
    00736 extern FLAC_API const unsigned FLAC__STREAM_METADATA_LENGTH_LEN;
    00739 #define FLAC__STREAM_METADATA_HEADER_LENGTH (4u)
    00740
    00741 /*****************************************************************************/
    00742
    00743
    00744 /*****************************************************************************
    00745  *
    00746  * Utility functions
    00747  *
    00748  *****************************************************************************/
    00749
    00758 FLAC_API FLAC__bool FLAC__format_sample_rate_is_valid(unsigned sample_rate);
    00759
    00772 FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_name_is_legal(const char *name);
    00773
    00788 FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_value_is_legal(const FLAC__byte *value, unsigned length);
    00789
    00804 FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_is_legal(const FLAC__byte *entry, unsigned length);
    00805
    00806 /* @@@@ add to unit tests; it is already indirectly tested by the metadata_object tests */
    00817 FLAC_API FLAC__bool FLAC__format_seektable_is_legal(const FLAC__StreamMetadata_SeekTable *seek_table);
    00818
    00819 /* @@@@ add to unit tests; it is already indirectly tested by the metadata_object tests */
    00832 FLAC_API unsigned FLAC__format_seektable_sort(FLAC__StreamMetadata_SeekTable *seek_table);
    00833
    00834 /* @@@@ add to unit tests; it is already indirectly tested by the metadata_object tests */
    00853 FLAC_API FLAC__bool FLAC__format_cuesheet_is_legal(const FLAC__StreamMetadata_CueSheet *cue_sheet, FLAC__bool check_cd_da_subset, const char **violation);
    00854
    00855 /* \} */
    00856
    00857 #ifdef __cplusplus
    00858 }
    00859 #endif
    00860
    00861 #endif