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[swftools.git] / lib / lame / VbrTag.h

diff --git a/lib/lame/VbrTag.h b/lib/lame/VbrTag.h
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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 */
+  int           enc_delay;              /* encoder delay */
+  int           enc_padding;            /* encoder paddign added at end of stream */
+}   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);
+int PutLameVBR(lame_global_flags *gfp, FILE *fpStream, uint8_t *pbtStreamBuffer, uint32_t id3v2size,  uint16_t crc);
+void AddVbrFrame(lame_global_flags *gfp);
+void ReportLameTagProgress(lame_global_flags *gfp,int nStart);
+void UpdateMusicCRC(uint16_t *crc,unsigned char *buffer, int size);
+
+#endif