mp3.h

项目描述: GINI is a lightweight, mostly Icecast/Shoutcast compatible streaming server for broadcasting

/*
 * mp3.h - header of mp3.c
 * Copyright 2002, 2003 Krisztian Pifko <[e-mail]>
 *
 * Taken from mp3info of Cedric Tefft <[e-mail]>.
 *
 * Author:
 *	Krisztian Pifko <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
#include <stdio.h>
#include <fcntl.h>
#include <ctype.h>
#include <sys/stat.h>
#include <sys/types.h>

#define MIN_CONSEC_GOOD_FRAMES 4
#define FRAME_HEADER_SIZE 4
#define MIN_FRAME_SIZE 21
#define NUM_SAMPLES 4

enum SCANTYPE { SCAN_NONE, SCAN_QUICK, SCAN_FULL };

typedef struct {
  unsigned long sync;
  unsigned int version;
  unsigned int layer;
  unsigned int crc;
  unsigned int bitrate;
  unsigned int freq;
  unsigned int padding;
  unsigned int extension;
  unsigned int mode;
  unsigned int mode_extension;
  unsigned int copyright;
  unsigned int original;
  unsigned int emphasis;
} mp3header;

typedef struct {
  char title[31];
  char artist[31];
  char album[31];
  char year[5];
  char comment[31];
  unsigned char track[1];
  unsigned char genre[1];
} id3tag;

typedef struct {
  char *filename;
  FILE *file;
  off_t datasize;
  int header_isvalid;
  mp3header header;
  int id3_isvalid;
  id3tag id3;
  int vbr;
  float vbr_average;
  int seconds;
  int frames;
  int badframes;
} mp3info;

extern int get_mp3_info (mp3info * mp3, int scantype, int fullscan_vbr, int *act_sec, int *act_bitrate,
			 int *act_nominal, char **act_artist, char **act_title);