/* Xing VBR tagging for LAME.
* Copyright (c) 1999 A.L. Faber
*/
#pragma once
/* -----------------------------------------------------------
* 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);
void UpdateMusicCRC(uint16_t * crc, const unsigned char *buffer, int size);
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