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- /*
- * 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
- #include "lame.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
- #define FRAMES_AND_BYTES (FRAMES_FLAG | BYTES_FLAG)
-
- /*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 */
- } VBRTAGDATA;
- int CheckVbrTag(unsigned char *buf);
- int GetVbrTag(VBRTAGDATA *pTagData, unsigned char *buf);
- int SeekPoint(unsigned char TOC[NUMTOCENTRIES], int file_bytes, float percent);
- int InitVbrTag(lame_global_flags *gfp);
- int PutVbrTag(lame_global_flags *gfp,FILE *fid,int nVbrScale);
- void AddVbrFrame(lame_global_flags *gfp);
- #endif
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