libaec.h

#ifndef LIBAEC_H
#define LIBAEC_H

#include <stddef.h>

struct internal_state;

struct aec_stream {
    const unsigned char *next_in;
    size_t avail_in;         /* number of bytes available at
                              * next_in */
    size_t total_in;         /* total number of input bytes read so
                              * far */
    unsigned char *next_out;
    size_t avail_out;        /* remaining free space at next_out */
    size_t total_out;        /* total number of bytes output so far */
    int bit_per_sample;      /* resolution in bits per sample (n =
                              * 1,..., 32) */
    int block_size;          /* block size in samples */
    int rsi;                 /* Reference sample interval, the number of
                                blocks between consecutive reference
                                samples. */
    int flags;

    struct internal_state *state;
};

/* Coder flags */
#define AEC_DATA_UNSIGNED     0
#define AEC_DATA_SIGNED       1
#define AEC_DATA_3BYTE        2  /* 24 bit samples coded in 3 bytes */
#define AEC_DATA_LSB          0
#define AEC_DATA_MSB         16
#define AEC_DATA_PREPROCESS  32  /* Set if preprocessor should be used */

/* Return codes of library functions */
#define AEC_OK            0
#define AEC_CONF_ERROR   (-1)
#define AEC_STREAM_ERROR (-2)
#define AEC_DATA_ERROR   (-3)
#define AEC_MEM_ERROR    (-4)

/* Options for flushing */
#define AEC_NO_FLUSH      0 /* Do not enforce output flushing. More
                             * input may be provided with later
                             * calls. So far only relevant for
                             * encoding.
                             */
#define AEC_FLUSH         1 /* Flush output and end encoding. The last
                             * call to aec_encode() must set AEC_FLUSH to
                             * drain all output.
                             *
                             * It is not possible to continue encoding
                             * of the same stream after it has been
                             * flushed because the last byte may be
                             * padded with fill bits.
                             */

int aec_decode_init(struct aec_stream *strm);
int aec_decode(struct aec_stream *strm, int flush);
int aec_decode_end(struct aec_stream *strm);

int aec_encode_init(struct aec_stream *strm);
int aec_encode(struct aec_stream *strm, int flush);
int aec_encode_end(struct aec_stream *strm);

#endif /* LIBAEC_H */