/*

 * Copyright 2008-2011 Various Authors

 * Copyright 2004 Timo Hirvonen

 *

 * 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, see <http://www.gnu.org/licenses/>.

 */

#ifndef _NOMAD_H

#define _NOMAD_H

#include <sys/types.h>

#ifndef __GNUC__

#include <unistd.h>

#endif

/* default callbacks use read, lseek, close */

struct nomad_callbacks {

	ssize_t (*read)(void *datasource, void *buffer, size_t count);

	off_t (*lseek)(void *datasource, off_t offset, int whence);

	int (*close)(void *datasource);

};

enum {

	XING_FRAMES = 0x00000001L,

	XING_BYTES  = 0x00000002L,

	XING_TOC    = 0x00000004L,

	XING_SCALE  = 0x00000008L

};

struct nomad_xing {

	unsigned int is_info : 1;

	unsigned int flags;

	unsigned int nr_frames;

	unsigned int bytes;

	unsigned int scale;

	unsigned char toc[100];

};

struct nomad_lame {

	char encoder[10];   /* 9 byte encoder name/version ("LAME3.97b") */

	int vbr_method;     /* VBR method */

	float peak;         /* replaygain peak */

	float trackGain;    /* replaygain track gain */

	float albumGain;    /* replaygain album gain */

	int encoderDelay;   /* # of added samples at start of mp3 */

	int encoderPadding; /* # of added samples at end of mp3 */

};

/* always 16-bit signed little-endian */

struct nomad_info {

	double duration;

	int sample_rate;

	int channels;

	int nr_frames;

	int layer;

	/* guessed */

	int vbr;

	/* guessed */

	int avg_bitrate;

	/* -1 if file not seekable */

	off_t filesize;

	unsigned int joint_stereo : 1;

	unsigned int dual_channel : 1;

};

enum {

	NOMAD_ERROR_SUCCESS,

	NOMAD_ERROR_ERRNO,

	NOMAD_ERROR_FILE_FORMAT

};

struct nomad;

/* -NOMAD_ERROR_ERRNO -NOMAD_ERROR_FILE_FORMAT */

int nomad_open_callbacks(struct nomad **nomadp, void *datasource,

		struct nomad_callbacks *cbs);

void nomad_close(struct nomad *nomad);

/* -NOMAD_ERROR_ERRNO */

int nomad_read(struct nomad *nomad, char *buffer, int count);

/* -NOMAD_ERROR_ERRNO */

int nomad_time_seek(struct nomad *nomad, double pos);

const struct nomad_xing *nomad_xing(struct nomad *nomad);

const struct nomad_lame *nomad_lame(struct nomad *nomad);

const struct nomad_info *nomad_info(struct nomad *nomad);

long nomad_current_bitrate(struct nomad *nomad);

#endif