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/*
* libacm - Interplay ACM audio decoder.
*
* Copyright (c) 2004-2008, Marko Kreen
* Copyright (c) 2008, Adam Gashlin
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef __LIBACM_H
#define __LIBACM_H
#include "../streamfile.h"
#define LIBACM_VERSION "1.0-svn"
#define ACM_ID 0x032897
#define ACM_WORD 2
#define ACM_HEADER_LEN 14
#define ACM_OK 0
#define ACM_ERR_OTHER -1
#define ACM_ERR_OPEN -2
#define ACM_ERR_NOT_ACM -3
#define ACM_ERR_READ_ERR -4
#define ACM_ERR_BADFMT -5
#define ACM_ERR_CORRUPT -6
#define ACM_ERR_UNEXPECTED_EOF -7
#define ACM_ERR_NOT_SEEKABLE -8
typedef struct ACMInfo {
unsigned channels;
unsigned rate;
unsigned acm_id;
unsigned acm_version;
unsigned acm_level;
unsigned acm_cols; /* 1 << acm_level */
unsigned acm_rows;
} ACMInfo;
struct ACMStream {
ACMInfo info;
unsigned total_values;
/* acm data stream */
STREAMFILE *streamfile;
unsigned data_len;
/* acm stream buffer */
unsigned bit_avail;
unsigned bit_data;
unsigned buf_start_ofs;
/* block lengths (in samples) */
unsigned block_len;
unsigned wrapbuf_len;
/* buffers */
int *block;
int *wrapbuf;
int *ampbuf;
int *midbuf; /* pointer into ampbuf */
/* result */
unsigned block_ready:1;
unsigned file_eof:1;
unsigned stream_pos; /* in words. absolute */
unsigned block_pos; /* in words, relative */
};
typedef struct ACMStream ACMStream;
/* decode.c */
int acm_open_decoder(ACMStream **res, STREAMFILE *facilitator_file, const char *const filename);
int acm_read(ACMStream *acm, void *buf, unsigned nbytes,
int bigendianp, int wordlen, int sgned);
void acm_close(ACMStream *acm);
void acm_reset(ACMStream *acm);
#endif
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