apps/mp3data.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Linus Nielsen Feltzing
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #ifndef _MP3DATA_H_
  23 #define _MP3DATA_H_
  24
  25 #define MPEG_VERSION1   0
  26 #define MPEG_VERSION2   1
  27 #define MPEG_VERSION2_5 2
  28
  29 struct mp3info {
  30     /* Standard MP3 frame header fields */
  31     int version;
  32     int layer;
  33     int bitrate;
  34     long frequency;
  35     int padding;
  36     int channel_mode;
  37     int frame_size;   /* Frame size in bytes */
  38     int frame_samples;/* Samples per frame */
  39     int ft_num;       /* Numerator of frametime in milliseconds */
  40     int ft_den;       /* Denominator of frametime in milliseconds */
  41
  42     bool is_vbr;      /* True if the file is VBR */
  43     bool has_toc;     /* True if there is a VBR header in the file */
  44     unsigned char toc[100];
  45     unsigned long frame_count; /* Number of frames in the file (if VBR) */
  46     unsigned long byte_count;  /* File size in bytes */
  47     unsigned long file_time;   /* Length of the whole file in milliseconds */
  48     int enc_delay;    /* Encoder delay, fetched from LAME header */
  49     int enc_padding;  /* Padded samples added to last frame. LAME header */
  50 };
  51
  52 /* Xing header information */
  53 #define VBR_FRAMES_FLAG  0x01
  54 #define VBR_BYTES_FLAG   0x02
  55 #define VBR_TOC_FLAG     0x04
  56 #define VBR_QUALITY_FLAG 0x08
  57
  58 #define MAX_XING_HEADER_SIZE 576
  59
  60 unsigned long find_next_frame(int fd, long *offset, long max_offset,
  61                               unsigned long last_header);
  62 unsigned long mem_find_next_frame(int startpos, long *offset, long max_offset,
  63                                   unsigned long last_header);
  64 int get_mp3file_info(int fd, struct mp3info *info);
  65 int count_mp3_frames(int fd, int startpos, int filesize,
  66                      void (*progressfunc)(int));
  67 int create_xing_header(int fd, long startpos, long filesize,
  68                        unsigned char *buf, unsigned long num_frames,
  69                        unsigned long rec_time, unsigned long header_template,
  70                        void (*progressfunc)(int), bool generate_toc);
  71
  72 extern unsigned long bytes2int(unsigned long b0,
  73                                unsigned long b1,
  74                                unsigned long b2,
  75                                unsigned long b3);
  76
  77 #endif