1 /* 2 * Xing VBR tagging for LAME. 3 * 4 * Copyright (c) 1999 A.L. Faber 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Library General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Library General Public License for more details. 15 * 16 * You should have received a copy of the GNU Library General Public 17 * License along with this library; if not, write to the 18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 19 * Boston, MA 02111-1307, USA. 20 */ 21 22 #ifndef LAME_VRBTAG_H 23 #define LAME_VRBTAG_H 24 #include "lame.h" 25 #include "config.h" 26 27 #if HAVE_INTTYPES_H 28 # include <inttypes.h> 29 #else 30 # if HAVE_STDINT_H 31 # include <stdint.h> 32 # endif 33 #endif 34 /* ----------------------------------------------------------- 35 * A Vbr header may be present in the ancillary 36 * data field of the first frame of an mp3 bitstream 37 * The Vbr header (optionally) contains 38 * frames total number of audio frames in the bitstream 39 * bytes total number of bytes in the bitstream 40 * toc table of contents 41 42 * toc (table of contents) gives seek points 43 * for random access 44 * the ith entry determines the seek point for 45 * i-percent duration 46 * seek point in bytes = (toc[i]/256.0) * total_bitstream_bytes 47 * e.g. half duration seek point = (toc[50]/256.0) * total_bitstream_bytes 48 */ 49 50 51 #define FRAMES_FLAG 0x0001 52 #define BYTES_FLAG 0x0002 53 #define TOC_FLAG 0x0004 54 #define VBR_SCALE_FLAG 0x0008 55 56 #define NUMTOCENTRIES 100 57 58 #define FRAMES_AND_BYTES (FRAMES_FLAG | BYTES_FLAG) 59 60 61 62 /*structure to receive extracted header */ 63 /* toc may be NULL*/ 64 typedef struct 65 { 66 int h_id; /* from MPEG header, 0=MPEG2, 1=MPEG1 */ 67 int samprate; /* determined from MPEG header */ 68 int flags; /* from Vbr header data */ 69 int frames; /* total bit stream frames from Vbr header data */ 70 int bytes; /* total bit stream bytes from Vbr header data*/ 71 int vbr_scale; /* encoded vbr scale from Vbr header data*/ 72 unsigned char toc[NUMTOCENTRIES]; /* may be NULL if toc not desired*/ 73 int headersize; /* size of VBR header, in bytes */ 74 } VBRTAGDATA; 75 76 int CheckVbrTag(unsigned char *buf); 77 int GetVbrTag(VBRTAGDATA *pTagData, unsigned char *buf); 78 79 int SeekPoint(unsigned char TOC[NUMTOCENTRIES], int file_bytes, float percent); 80 int InitVbrTag(lame_global_flags *gfp); 81 int PutVbrTag(lame_global_flags *gfp,FILE *fid,int nVbrScale); 82 int PutLameVBR(lame_global_flags *gfp, FILE *fpStream, u_char *pbtStreamBuffer, uint32_t id3v2size, uint16_t crc); 83 void AddVbrFrame(lame_global_flags *gfp); 84 void ReportLameTagProgress(lame_global_flags *gfp,int nStart); 85 86 #endif 87