nomad.h

   1 /*
   2  * Copyright 2004 Timo Hirvonen
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  17  * 02111-1307, USA.
  18  */
  19
  20 #ifndef _NOMAD_H
  21 #define _NOMAD_H
  22
  23 #include <mad.h>
  24 #include <sys/types.h>
  25
  26 #define INPUT_BUFFER_SIZE       (5 * 8192)
  27
  28 #define SEEK_IDX_INTERVAL  15
  29
  30 /* default callbacks use read, lseek, close */
  31 struct nomad_callbacks {
  32         ssize_t (*read)(void *datasource, void *buffer, size_t count);
  33         off_t (*lseek)(void *datasource, off_t offset, int whence);
  34         int (*close)(void *datasource);
  35 };
  36
  37 /* always 16-bit signed little-endian */
  38 struct nomad_info {
  39         double duration;
  40         int sample_rate;
  41         int channels;
  42         int nr_frames;
  43         int layer;
  44         /* -1 if fast = 1 */
  45         int vbr;
  46         /* -1 if fast = 1 */
  47         int avg_bitrate;
  48         /* -1 if file not seekable */
  49         int filesize;
  50         unsigned int joint_stereo : 1;
  51         unsigned int dual_channel : 1;
  52 };
  53
  54 enum {
  55         NOMAD_ERROR_SUCCESS,
  56         NOMAD_ERROR_ERRNO,
  57         NOMAD_ERROR_FILE_FORMAT
  58 };
  59
  60 struct nomad;
  61
  62 /* -NOMAD_ERROR_ERRNO -NOMAD_ERROR_FILE_FORMAT */
  63 int nomad_open(struct nomad **nomadp, int fd, int fast);
  64 int nomad_open_callbacks(struct nomad **nomadp, void *datasource, int fast,
  65                 struct nomad_callbacks *cbs);
  66
  67 void nomad_close(struct nomad *nomad);
  68 void nomad_info(struct nomad *nomad, struct nomad_info *info);
  69
  70 /* -NOMAD_ERROR_ERRNO */
  71 int nomad_read(struct nomad *nomad, char *buffer, int count);
  72
  73 /* -NOMAD_ERROR_ERRNO */
  74 int nomad_time_seek(struct nomad *nomad, double pos);
  75
  76 double nomad_time_tell(struct nomad *nomad);
  77 double nomad_time_total(struct nomad *nomad);
  78
  79 #endif