firmware/export/mp3data.h

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2002 by Linus Nielsen Feltzing
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#ifndef _MP3DATA_H_
#define _MP3DATA_H_

#define MPEG_VERSION2_5 0
#define MPEG_VERSION1   1
#define MPEG_VERSION2   2

struct mp3info {
    /* Standard MP3 frame header fields */
    int version;
    int layer;
    bool protection;
    int bitrate;
    int frequency;
    int padding;
    int channel_mode;
    int mode_extension;
    int emphasis;
    int frame_size; /* Frame size in bytes */
    int frame_time; /* Frame duration in milliseconds */

    bool is_vbr;     /* True if the file is VBR */
    bool has_toc;    /* True if there is a VBR header in the file */
    bool is_xing_vbr; /* True if the VBR header is of Xing type */
    bool is_vbri_vbr; /* True if the VBR header is of VBRI type */
    unsigned char toc[100];
    long frame_count; /* Number of frames in the file (if VBR) */
    long byte_count;  /* File size in bytes */
    long file_time;   /* Length of the whole file in milliseconds */
    int vbr_header_pos;
    int enc_delay;    /* Encoder delay, fetched from LAME header */
    int enc_padding;  /* Padded samples added to last frame. LAME header */
};

/* Xing header information */
#define VBR_FRAMES_FLAG  0x01
#define VBR_BYTES_FLAG   0x02
#define VBR_TOC_FLAG     0x04
#define VBR_QUALITY_FLAG 0x08

unsigned long find_next_frame(int fd, long *offset, long max_offset, unsigned long last_header);
unsigned long mem_find_next_frame(int startpos, long *offset, long max_offset,
                                  unsigned long last_header);
int get_mp3file_info(int fd, struct mp3info *info);
int count_mp3_frames(int fd, int startpos, int filesize,
                     void (*progressfunc)(int));
int create_xing_header(int fd, int startpos, int filesize,
                       unsigned char *buf, int num_frames,
                       unsigned long header_template,
                       void (*progressfunc)(int), bool generate_toc);

#endif