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  1. /* libFLAC - Free Lossless Audio Codec library
  2.  * Copyright (C) 2000,2001  Josh Coalson
  3.  *
  4.  * This library is free software; you can redistribute it and/or
  5.  * modify it under the terms of the GNU Library General Public
  6.  * License as published by the Free Software Foundation; either
  7.  * version 2 of the License, or (at your option) any later version.
  8.  *
  9.  * This library is distributed in the hope that it will be useful,
  10.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12.  * Library General Public License for more details.
  13.  *
  14.  * You should have received a copy of the GNU Library General Public
  15.  * License along with this library; if not, write to the
  16.  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17.  * Boston, MA  02111-1307, USA.
  18.  */
  19.  
  20. #ifndef FLAC__FORMAT_H
  21. #define FLAC__FORMAT_H
  22.  
  23. #include "ordinals.h"
  24.  
  25. /* changing the following values to be higher will break the framing and hence the stream format, so DON'T! */
  26. #define FLAC__MIN_BLOCK_SIZE (16u)
  27. #define FLAC__MAX_BLOCK_SIZE (65535u)
  28. #define FLAC__MAX_CHANNELS (8u)
  29. #define FLAC__MIN_BITS_PER_SAMPLE (4u)
  30. /*NOTE: only up to 24 because of the current predictor coefficient quantization and the fact we use FLAC__int32s for all work */
  31. #define FLAC__MAX_BITS_PER_SAMPLE (24u)
  32. /* the following is ((2 ** 20) - 1) div 10 */
  33. #define FLAC__MAX_SAMPLE_RATE (1048570u)
  34. #define FLAC__MAX_LPC_ORDER (32u)
  35. #define FLAC__MIN_QLP_COEFF_PRECISION (5u)
  36. /* changing FLAC__MAX_FIXED_ORDER also means changing all of fixed.c and more, so DON'T! */
  37. #define FLAC__MAX_FIXED_ORDER (4u)
  38. #define FLAC__MAX_RICE_PARTITION_ORDER (15u)
  39.  
  40. /* VERSION should come from configure */
  41. #ifdef VERSION
  42. #define FLAC__VERSION_STRING VERSION
  43. #endif
  44.  
  45. extern const FLAC__byte FLAC__STREAM_SYNC_STRING[4]; /* = "fLaC" */;
  46. extern const unsigned FLAC__STREAM_SYNC; /* = 0x664C6143 */;
  47. extern const unsigned FLAC__STREAM_SYNC_LEN; /* = 32 bits */;
  48.  
  49.  
  50. /*****************************************************************************
  51.  *
  52.  * NOTE: Within the bitstream, all fixed-width numbers are big-endian coded.
  53.  *       All numbers are unsigned unless otherwise noted.
  54.  *
  55.  *****************************************************************************/
  56.  
  57.  
  58. /*****************************************************************************
  59.  *
  60.  * Subframe structures
  61.  *
  62.  *****************************************************************************/
  63.  
  64. /*****************************************************************************/
  65.  
  66. typedef enum {
  67.         FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE = 0
  68. } FLAC__EntropyCodingMethodType;
  69. extern const char *FLAC__EntropyCodingMethodTypeString[];
  70.  
  71. /*****************************************************************************
  72.  *
  73.  *  4: partition order => (2 ** order) subdivisions
  74.  */
  75. typedef struct {
  76.         unsigned order;
  77.         unsigned parameters[1 << FLAC__MAX_RICE_PARTITION_ORDER];
  78.         unsigned raw_bits[1 << FLAC__MAX_RICE_PARTITION_ORDER];
  79. } FLAC__EntropyCodingMethod_PartitionedRice;
  80.  
  81. extern const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN; /* = 4 bits */
  82. extern const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN; /* = 4 bits */
  83. extern const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN; /* = 5 bits */
  84.  
  85. extern const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER; /* = (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN)-1 */
  86.  
  87. /*****************************************************************************
  88.  *
  89.  *  2: entropy coding method:
  90.  *     00: partitioned rice coding
  91.  *     01-11: reserved
  92.  *  ?: entropy coding method data
  93.  */
  94. typedef struct {
  95.         FLAC__EntropyCodingMethodType type;
  96.         union {
  97.                 FLAC__EntropyCodingMethod_PartitionedRice partitioned_rice;
  98.         } data;
  99. } FLAC__EntropyCodingMethod;
  100.  
  101. extern const unsigned FLAC__ENTROPY_CODING_METHOD_TYPE_LEN; /* = 2 bits */
  102.  
  103. /*****************************************************************************/
  104.  
  105. typedef enum {
  106.         FLAC__SUBFRAME_TYPE_CONSTANT = 0,
  107.         FLAC__SUBFRAME_TYPE_VERBATIM = 1,
  108.         FLAC__SUBFRAME_TYPE_FIXED = 2,
  109.         FLAC__SUBFRAME_TYPE_LPC = 3
  110. } FLAC__SubframeType;
  111. extern const char *FLAC__SubframeTypeString[];
  112.  
  113. /*****************************************************************************
  114.  *
  115.  * n: constant value for signal; n = frame's bits-per-sample
  116.  */
  117. typedef struct {
  118.         FLAC__int32 value;
  119. } FLAC__Subframe_Constant;
  120.  
  121. /*****************************************************************************
  122.  *
  123.  * n*i: unencoded signal; n = frame's bits-per-sample, i = frame's blocksize
  124.  */
  125. typedef struct {
  126.         const FLAC__int32 *data;
  127. } FLAC__Subframe_Verbatim;
  128.  
  129. /*****************************************************************************
  130.  *
  131.  *  n: unencoded warm-up samples (n = fixed-predictor order * bits per sample)
  132.  *  ?: entropy coding method info
  133.  *  ?: encoded residual ((blocksize minus fixed-predictor order) samples)
  134.  *  The order is stored in the main subframe header
  135.  */
  136. typedef struct {
  137.         FLAC__EntropyCodingMethod entropy_coding_method;
  138.         unsigned order;
  139.         FLAC__int32 warmup[FLAC__MAX_FIXED_ORDER];
  140.         const FLAC__int32 *residual;
  141. } FLAC__Subframe_Fixed;
  142.  
  143. /*****************************************************************************
  144.  *
  145.  *  n: unencoded warm-up samples (n = lpc order * bits per sample)
  146.  *  4: (qlp coeff precision in bits)-1 (1111 = invalid, use to check for erroneous sync)
  147.  *  5: qlp shift needed in bits (signed)
  148.  *  n: unencoded predictor coefficients (n = lpc order * qlp coeff precision)
  149.  *  ?: entropy coding method info
  150.  *  ?: encoded residual ((blocksize minus lpc order) samples)
  151.  *  The order is stored in the main subframe header
  152.  */
  153. typedef struct {
  154.         FLAC__EntropyCodingMethod entropy_coding_method;
  155.         unsigned order;
  156.         unsigned qlp_coeff_precision;
  157.         int quantization_level;
  158.         FLAC__int32 qlp_coeff[FLAC__MAX_LPC_ORDER];
  159.         FLAC__int32 warmup[FLAC__MAX_LPC_ORDER];
  160.         const FLAC__int32 *residual;
  161. } FLAC__Subframe_LPC;
  162.  
  163. extern const unsigned FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN; /* = 4 bits */
  164. extern const unsigned FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN; /* = 5 bits */
  165.  
  166. /*****************************************************************************
  167.  *
  168.  *  1: zero pad, to prevent sync-fooling string of 1s (use to check for erroneous sync)
  169.  *  6: subframe type
  170.  *       000000: constant value
  171.  *       000001: verbatim
  172.  *       00001x: reserved
  173.  *       0001xx: reserved
  174.  *       001xxx: fixed predictor, xxx=order <= 4, else reserved
  175.  *       01xxxx: reserved
  176.  *       1xxxxx: lpc, xxxxx=order-1
  177.  *  1: 'wasted bits' flag
  178.  *       0: no wasted bits in source subblock
  179.  *       1: all samples in source subblock contain n 0 least significant bits.  n-1 follows, unary coded, i.e. n=3, 001 follows, n=7, 0000001 follows.
  180.  *             ?: unary coded (n-1)
  181.  *  ?: subframe-specific data (c.f. FLAC__Subframe_*)
  182.  */
  183. typedef struct {
  184.         FLAC__SubframeType type;
  185.         union {
  186.                 FLAC__Subframe_Constant constant;
  187.                 FLAC__Subframe_Fixed fixed;
  188.                 FLAC__Subframe_LPC lpc;
  189.                 FLAC__Subframe_Verbatim verbatim;
  190.         } data;
  191.         unsigned wasted_bits;
  192. } FLAC__Subframe;
  193.  
  194. extern const unsigned FLAC__SUBFRAME_ZERO_PAD_LEN; /* = 1 bit */
  195. extern const unsigned FLAC__SUBFRAME_TYPE_LEN; /* = 6 bits */
  196. extern const unsigned FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN; /* = 1 bit */
  197.  
  198. extern const unsigned FLAC__SUBFRAME_TYPE_CONSTANT_BYTE_ALIGNED_MASK; /* = 0x00 */
  199. extern const unsigned FLAC__SUBFRAME_TYPE_VERBATIM_BYTE_ALIGNED_MASK; /* = 0x02 */
  200. extern const unsigned FLAC__SUBFRAME_TYPE_FIXED_BYTE_ALIGNED_MASK; /* = 0x10 */
  201. extern const unsigned FLAC__SUBFRAME_TYPE_LPC_BYTE_ALIGNED_MASK; /* = 0x40 */
  202.  
  203. /*****************************************************************************/
  204.  
  205.  
  206. /*****************************************************************************
  207.  *
  208.  * Frame structures
  209.  *
  210.  *****************************************************************************/
  211.  
  212. typedef enum {
  213.         FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT = 0,
  214.         FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE = 1,
  215.         FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE = 2,
  216.         FLAC__CHANNEL_ASSIGNMENT_MID_SIDE = 3
  217. } FLAC__ChannelAssignment;
  218. extern const char *FLAC__ChannelAssignmentString[];
  219.  
  220. typedef enum {
  221.         FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER,
  222.         FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER
  223. } FLAC__FrameNumberType;
  224. extern const char *FLAC__FrameNumberTypeString[];
  225.  
  226. /*****************************************************************************
  227.  *
  228.  * 14: sync code '11111111111110'
  229.  *  2: reserved
  230.  *        00: currently required value
  231.  *        01-11: reserved
  232.  *  4: blocksize in samples
  233.  *        0000: get from stream header => implies constant blocksize throughout stream
  234.  *        0001: 192 samples (AES/EBU) => implies constant blocksize throughout stream
  235.  *        0010-0101: 576 * (2^(n-2)) samples, i.e. 576/1152/2304/4608 => implies constant blocksize throughout stream
  236.  *        0110: get 8 bit (blocksize-1) from end of header => possibly variable blocksize throughout stream unless it's the last frame
  237.  *        0111: get 16 bit (blocksize-1) from end of header => possibly variable blocksize throughout stream unless it's the last frame
  238.  *        1000-1111: 256 * (2^(n-8)) samples, i.e. 256/512/1024/2048/4096/8192/16384/32768 => implies constant blocksize throughout stream
  239.  *  4: sample rate:
  240.  *        0000: get from stream header
  241.  *        0001-0011: reserved
  242.  *        0100: 8kHz
  243.  *        0101: 16kHz
  244.  *        0110: 22.05kHz
  245.  *        0111: 24kHz
  246.  *        1000: 32kHz
  247.  *        1001: 44.1kHz
  248.  *        1010: 48kHz
  249.  *        1011: 96kHz
  250.  *        1100: get 8 bit sample rate (in kHz) from end of header
  251.  *        1101: get 16 bit sample rate (in Hz) from end of header
  252.  *        1110: get 16 bit sample rate (in tens of Hz) from end of header
  253.  *        1111: invalid, to prevent sync-fooling string of 1s (use to check for erroneous sync)
  254.  *  4: channel assignment
  255.  *     0000-0111: (number of independent channels)-1.  when == 0001, channel 0 is the left channel and channel 1 is the right
  256.  *     1000: left/side stereo : channel 0 is the left             channel, channel 1 is the side(difference) channel
  257.  *     1001: right/side stereo: channel 0 is the side(difference) channel, channel 1 is the right            channel
  258.  *     1010: mid/side stereo  : channel 0 is the mid(average)     channel, channel 1 is the side(difference) channel
  259.  *     1011-1111: reserved
  260.  *  3: sample size in bits
  261.  *        000: get from stream header
  262.  *        001: 8 bits per sample
  263.  *        010: 12 bits per sample
  264.  *        011: reserved
  265.  *        100: 16 bits per sample
  266.  *        101: 20 bits per sample
  267.  *        110: 24 bits per sample
  268.  *        111: reserved
  269.  *  1: zero pad, to prevent sync-fooling string of 1s (use to check for erroneous sync)
  270.  *  ?: if(variable blocksize)
  271.  *        8-56: 'UTF-8' coded sample number (decoded number is 0-36 bits) (use to check for erroneous sync)
  272.  *     else
  273.  *        8-48: 'UTF-8' coded frame number (decoded number is 0-31 bits) (use to check for erroneous sync)
  274.  *  ?: if(blocksize bits == 11x)
  275.  *        8/16 bit (blocksize-1)
  276.  *  ?: if(sample rate bits == 11xx)
  277.  *        8/16 bit sample rate
  278.  *  8: CRC-8 (polynomial = x^8 + x^2 + x^1 + x^0, initialized with 0) of everything before the crc, including the sync code
  279.  */
  280. typedef struct {
  281.         unsigned blocksize; /* in samples */
  282.         unsigned sample_rate; /* in Hz */
  283.         unsigned channels;
  284.         FLAC__ChannelAssignment channel_assignment;
  285.         unsigned bits_per_sample;
  286.         FLAC__FrameNumberType number_type;
  287.         union {
  288.                 FLAC__uint32 frame_number;
  289.                 FLAC__uint64 sample_number;
  290.         } number;
  291.         FLAC__uint8 crc;
  292. } FLAC__FrameHeader;
  293.  
  294. extern const unsigned FLAC__FRAME_HEADER_SYNC; /* = 0x3ffe */
  295. extern const unsigned FLAC__FRAME_HEADER_SYNC_LEN; /* = 14 bits */
  296. extern const unsigned FLAC__FRAME_HEADER_RESERVED_LEN; /* = 2 bits */
  297. extern const unsigned FLAC__FRAME_HEADER_BLOCK_SIZE_LEN; /* = 4 bits */
  298. extern const unsigned FLAC__FRAME_HEADER_SAMPLE_RATE_LEN; /* = 4 bits */
  299. extern const unsigned FLAC__FRAME_HEADER_CHANNEL_ASSIGNMENT_LEN; /* = 4 bits */
  300. extern const unsigned FLAC__FRAME_HEADER_BITS_PER_SAMPLE_LEN; /* = 3 bits */
  301. extern const unsigned FLAC__FRAME_HEADER_ZERO_PAD_LEN; /* = 1 bit */
  302. extern const unsigned FLAC__FRAME_HEADER_CRC_LEN; /* = 8 bits */
  303.  
  304. /*****************************************************************************
  305.  *
  306.  * 16: CRC-16 (polynomial = x^16 + x^15 + x^2 + x^0, initialized with 0) of everything before the crc, back to and including the frame header sync code
  307.  */
  308. typedef struct {
  309.         FLAC__uint16 crc;
  310. } FLAC__FrameFooter;
  311.  
  312. extern const unsigned FLAC__FRAME_FOOTER_CRC_LEN; /* = 16 bits */
  313.  
  314. typedef struct {
  315.         FLAC__FrameHeader header;
  316.         FLAC__Subframe subframes[FLAC__MAX_CHANNELS];
  317.         FLAC__FrameFooter footer;
  318. } FLAC__Frame;
  319.  
  320. /*****************************************************************************/
  321.  
  322.  
  323. /*****************************************************************************
  324.  *
  325.  * Meta-data structures
  326.  *
  327.  *****************************************************************************/
  328.  
  329. typedef enum {
  330.         FLAC__METADATA_TYPE_STREAMINFO = 0,
  331.         FLAC__METADATA_TYPE_PADDING = 1,
  332.         FLAC__METADATA_TYPE_APPLICATION = 2,
  333.         FLAC__METADATA_TYPE_SEEKTABLE = 3
  334. } FLAC__MetaDataType;
  335. extern const char *FLAC__MetaDataTypeString[];
  336.  
  337. /*****************************************************************************
  338.  *
  339.  * 16: minimum blocksize (in samples) of all blocks in the stream
  340.  * 16: maximum blocksize (in samples) of all blocks in the stream
  341.  * 24: minimum framesize (in bytes) of all frames in the stream; 0 => unknown
  342.  * 24: maximum framesize (in bytes) of all frames in the stream; 0 => unknown
  343.  * 20: sample rate in Hz, 0 is invalid
  344.  *  3: (number of channels)-1
  345.  *  5: (bits per sample)-1
  346.  * 36: total samples, 0 => unknown
  347.  *128: MD5 digest of the original unencoded audio data
  348.  *---- -----------------
  349.  * 34  bytes total
  350.  */
  351. typedef struct {
  352.         unsigned min_blocksize, max_blocksize;
  353.         unsigned min_framesize, max_framesize;
  354.         unsigned sample_rate;
  355.         unsigned channels;
  356.         unsigned bits_per_sample;
  357.         FLAC__uint64 total_samples;
  358.         FLAC__byte md5sum[16];
  359. } FLAC__StreamMetaData_StreamInfo;
  360.  
  361. extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN; /* = 16 bits */
  362. extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN; /* = 16 bits */
  363. extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN; /* = 24 bits */
  364. extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN; /* = 24 bits */
  365. extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN; /* = 20 bits */
  366. extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN; /* = 3 bits */
  367. extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN; /* = 5 bits */
  368. extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN; /* = 36 bits */
  369. extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_MD5SUM_LEN; /* = 128 bits */
  370. extern const unsigned FLAC__STREAM_METADATA_STREAMINFO_LENGTH; /* = 34 bytes */
  371.  
  372. /*****************************************************************************
  373.  *
  374.  *   n: '0' bits
  375.  *----- -----------------
  376.  * n/8  bytes total
  377.  */
  378. typedef struct {
  379.         int dummy; /* conceptually this is an empty struct since we don't store the padding bytes */
  380.                    /* empty structs are allowed by C++ but not C, hence the 'dummy' */
  381. } FLAC__StreamMetaData_Padding;
  382.  
  383. /*****************************************************************************
  384.  *
  385.  *    32: Registered application ID
  386.  *     n: Application data
  387.  *------- -----------------
  388.  * 4+n/8  bytes total
  389.  */
  390. typedef struct {
  391.         FLAC__byte id[4];
  392.         FLAC__byte *data;
  393. } FLAC__StreamMetaData_Application;
  394.  
  395. extern const unsigned FLAC__STREAM_METADATA_APPLICATION_ID_LEN; /* = 32 bits */
  396.  
  397. /*****************************************************************************
  398.  *
  399.  *  64: sample number of target frame
  400.  *  64: offset, in bytes, of target frame with respect to beginning of first frame
  401.  *  16: number of samples in the target frame
  402.  *----- -----------------
  403.  *  18  bytes total
  404.  */
  405. typedef struct {
  406.         FLAC__uint64 sample_number;
  407.         FLAC__uint64 stream_offset;
  408.         unsigned frame_samples;
  409. } FLAC__StreamMetaData_SeekPoint;
  410.  
  411. extern const unsigned FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN; /* = 64 bits */
  412. extern const unsigned FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN; /* = 64 bits */
  413. extern const unsigned FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN; /* = 16 bits */
  414. extern const unsigned FLAC__STREAM_METADATA_SEEKPOINT_LEN; /* = 18 bytes */
  415.  
  416. extern const FLAC__uint64 FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER; /* = 0xffffffffffffffff */
  417.  
  418. /*****************************************************************************
  419.  *
  420.  *      0: num_points is implied by the metadata block 'length' field (i.e. num_points = length / 18)
  421.  * n*18*8: seek points (n = num_points, 18 is the size of a seek point in bytes)
  422.  * ------- -----------------
  423.  *   n*18  bytes total
  424.  *
  425.  * NOTE: the seek points must be sorted by ascending sample number.
  426.  * NOTE: each seek point's sample number must be the first sample of the target frame.
  427.  * NOTE: each seek point's sample number must be unique within the table.
  428.  * NOTE: existence of a SEEKTABLE block implies a correct setting of total_samples in the stream_info block.
  429.  * NOTE: behavior is undefined when more than one SEEKTABLE block is present in a stream.
  430.  */
  431. typedef struct {
  432.         unsigned num_points;
  433.         FLAC__StreamMetaData_SeekPoint *points;
  434. } FLAC__StreamMetaData_SeekTable;
  435.  
  436. /*****************************************************************************
  437.  *
  438.  *  1: =1 if this is the last meta-data block, else =0
  439.  *  7: meta-data type (c.f. FLAC__MetaDataType)
  440.  * 24: length (in bytes) of the block-specific data to follow
  441.  *---- -----------------
  442.  *  4  bytes total
  443.  */
  444. typedef struct {
  445.         FLAC__MetaDataType type;
  446.         FLAC__bool is_last;
  447.         unsigned length; /* in bytes */
  448.         union {
  449.                 FLAC__StreamMetaData_StreamInfo stream_info;
  450.                 FLAC__StreamMetaData_Padding padding;
  451.                 FLAC__StreamMetaData_Application application;
  452.                 FLAC__StreamMetaData_SeekTable seek_table;
  453.         } data;
  454. } FLAC__StreamMetaData;
  455.  
  456. extern const unsigned FLAC__STREAM_METADATA_IS_LAST_LEN; /* = 1 bits */
  457. extern const unsigned FLAC__STREAM_METADATA_TYPE_LEN; /* = 7 bits */
  458. extern const unsigned FLAC__STREAM_METADATA_LENGTH_LEN; /* = 24 bits */
  459.  
  460. /*****************************************************************************/
  461.  
  462.  
  463. /*****************************************************************************
  464.  *
  465.  * Stream structures
  466.  *
  467.  *****************************************************************************/
  468.  
  469. typedef struct {
  470.         FLAC__StreamMetaData_StreamInfo stream_info;
  471.         FLAC__Frame *frames;
  472. } FLAC__Stream;
  473.  
  474. /*****************************************************************************/
  475.  
  476. #endif
  477.