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#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 (up to 4096).
*/
int flags;
struct internal_state *state;
};
/* Sample data description flags */
#define AEC_DATA_UNSIGNED 0 /* Samples are unsigned integers (default) */
#define AEC_DATA_SIGNED 1 /* Samples are signed. Telling libaec
* this results in a slightly better
* compression ratio.
*/
#define AEC_DATA_3BYTE 2 /* 24 bit samples are coded in 3 bytes */
#define AEC_DATA_MSB 16 /* Samples are stored with their most
* significant bit first. This has
* nothing to do with the endianness
* of the host.
*/
#define AEC_DATA_LSB 0 /* Samples are stored LSB first (default) */
#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.
*/
/* Streaming encoding and decoding functions */
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);
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);
/* Utility functions for encoding or decoding a memory buffer. */
int aec_buffer_encode(struct aec_stream *strm);
int aec_buffer_decode(struct aec_stream *strm);
#endif /* LIBAEC_H */
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