/*

 *      Xing VBR tagging for LAME.

 *

 *      Copyright (c) 1999 A.L. Faber

 *

 * 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 LAME_VRBTAG_H

#define LAME_VRBTAG_H

/* -----------------------------------------------------------

 * A Vbr header may be present in the ancillary

 * data field of the first frame of an mp3 bitstream

 * The Vbr header (optionally) contains

 *      frames      total number of audio frames in the bitstream

 *      bytes       total number of bytes in the bitstream

 *      toc         table of contents

 * toc (table of contents) gives seek points

 * for random access

 * the ith entry determines the seek point for

 * i-percent duration

 * seek point in bytes = (toc[i]/256.0) * total_bitstream_bytes

 * e.g. half duration seek point = (toc[50]/256.0) * total_bitstream_bytes

 */

#define FRAMES_FLAG     0x0001

#define BYTES_FLAG      0x0002

#define TOC_FLAG        0x0004

#define VBR_SCALE_FLAG  0x0008

#define NUMTOCENTRIES 100

#ifndef lame_internal_flags_defined

#define lame_internal_flags_defined

struct lame_internal_flags;

typedef struct lame_internal_flags lame_internal_flags;

#endif

/*structure to receive extracted header */

/* toc may be NULL*/

typedef struct {

    int     h_id;            /* from MPEG header, 0=MPEG2, 1=MPEG1 */

    int     samprate;        /* determined from MPEG header */

    int     flags;           /* from Vbr header data */

    int     frames;          /* total bit stream frames from Vbr header data */

    int     bytes;           /* total bit stream bytes from Vbr header data */

    int     vbr_scale;       /* encoded vbr scale from Vbr header data */

    unsigned char toc[NUMTOCENTRIES]; /* may be NULL if toc not desired */

    int     headersize;      /* size of VBR header, in bytes */

    int     enc_delay;       /* encoder delay */

    int     enc_padding;     /* encoder paddign added at end of stream */

} VBRTAGDATA;

int     GetVbrTag(VBRTAGDATA * pTagData, const unsigned char *buf);

int     InitVbrTag(lame_global_flags * gfp);

int     PutVbrTag(lame_global_flags const *gfp, FILE * fid);

void    AddVbrFrame(lame_internal_flags * gfc);

void    UpdateMusicCRC(uint16_t * crc, const unsigned char *buffer, int size);

#endif