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118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
/*
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* libacm - Interplay ACM audio decoder.
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*
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* Copyright (c) 2004-2010, Marko Kreen
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef __LIBACM_H
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#define __LIBACM_H
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#define LIBACM_VERSION "1.1"
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#define ACM_ID 0x032897
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#define ACM_WORD 2
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#define ACM_OK 0
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#define ACM_ERR_OTHER -1
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#define ACM_ERR_OPEN -2
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#define ACM_ERR_NOT_ACM -3
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#define ACM_ERR_READ_ERR -4
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#define ACM_ERR_BADFMT -5
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#define ACM_ERR_CORRUPT -6
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#define ACM_ERR_UNEXPECTED_EOF -7
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#define ACM_ERR_NOT_SEEKABLE -8
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typedef struct ACMInfo {
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unsigned channels;
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unsigned rate;
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unsigned acm_id;
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unsigned acm_version;
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unsigned acm_channels; /* channels from header (usually wrong) */
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unsigned acm_level;
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unsigned acm_cols; /* 1 << acm_level */
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unsigned acm_rows;
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} ACMInfo;
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typedef struct {
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/* read bytes */
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int (*read_func)(void *ptr, int size, int n, void *datasrc);
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/* optional, must support seeking into start*/
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int (*seek_func)(void *datasrc, int offset, int whence);
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/* optional, called on acm_close */
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int (*close_func)(void *datasrc);
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/* returns size in bytes*/
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int (*get_length_func)(void *datasrc);
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} acm_io_callbacks;
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struct ACMStream {
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ACMInfo info;
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unsigned total_values;
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/* acm data stream */
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void *io_arg;
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acm_io_callbacks io;
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unsigned data_len;
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/* acm stream buffer */
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unsigned char *buf;
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unsigned buf_max, buf_size, buf_pos, bit_avail;
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unsigned bit_data;
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unsigned buf_start_ofs;
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/* block lengths (in samples) */
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unsigned block_len;
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unsigned wrapbuf_len;
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/* buffers */
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int *block;
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int *wrapbuf;
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int *ampbuf;
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int *midbuf; /* pointer into ampbuf */
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/* result */
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unsigned block_ready:1;
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unsigned file_eof:1;
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unsigned wavc_file:1;
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unsigned stream_pos; /* in words. absolute */
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unsigned block_pos; /* in words, relative */
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};
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typedef struct ACMStream ACMStream;
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/* decode.c */
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int acm_open_decoder(ACMStream **res, void *io_arg, acm_io_callbacks io, int force_chans);
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int acm_read(ACMStream *acm, void *buf, unsigned nbytes,
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int bigendianp, int wordlen, int sgned);
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void acm_close(ACMStream *acm);
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/* util.c */
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int acm_open_file(ACMStream **acm, const char *filename, int force_chans);
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const ACMInfo *acm_info(ACMStream *acm);
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int acm_seekable(ACMStream *acm);
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unsigned acm_bitrate(ACMStream *acm);
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unsigned acm_rate(ACMStream *acm);
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unsigned acm_channels(ACMStream *acm);
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unsigned acm_raw_total(ACMStream *acm);
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unsigned acm_raw_tell(ACMStream *acm);
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unsigned acm_pcm_total(ACMStream *acm);
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unsigned acm_pcm_tell(ACMStream *acm);
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unsigned acm_time_total(ACMStream *acm);
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unsigned acm_time_tell(ACMStream *acm);
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int acm_read_loop(ACMStream *acm, void *dst, unsigned len,
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int bigendianp, int wordlen, int sgned);
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int acm_seek_pcm(ACMStream *acm, unsigned pcm_pos);
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int acm_seek_time(ACMStream *acm, unsigned pos_ms);
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const char *acm_strerror(int err);
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#endif
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