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#ifndef DSD2PCM_H_INCLUDED
#define DSD2PCM_H_INCLUDED
#include <stddef.h>
#include <string.h>
#ifdef __cplusplus
extern "C" {
#endif
struct dsd2pcm_ctx_s;
typedef struct dsd2pcm_ctx_s dsd2pcm_ctx;
/**
* initializes a "dsd2pcm engine" for one channel
* (precomputes tables and allocates memory)
*
* This is the only function that is not thread-safe in terms of the
* POSIX thread-safety definition because it modifies global state
* (lookup tables are computed during the first call)
*/
extern dsd2pcm_ctx* dsd2pcm_init(void);
/**
* deinitializes a "dsd2pcm engine"
* (releases memory, don't forget!)
*/
extern void dsd2pcm_destroy(dsd2pcm_ctx *ctx);
/**
* clones the context and returns a pointer to the
* newly allocated copy
*/
extern dsd2pcm_ctx* dsd2pcm_clone(dsd2pcm_ctx *ctx);
/**
* resets the internal state for a fresh new stream
*/
extern void dsd2pcm_reset(dsd2pcm_ctx *ctx);
/**
* "translates" a stream of octets to a stream of floats
* (8:1 decimation)
* @param ctx -- pointer to abstract context (buffers)
* @param samples -- number of octets/samples to "translate"
* @param src -- pointer to first octet (input)
* @param src_stride -- src pointer increment
* @param lsbitfirst -- bitorder, 0=msb first, 1=lsbfirst
* @param dst -- pointer to first float (output)
* @param dst_stride -- dst pointer increment
*/
extern void dsd2pcm_translate(dsd2pcm_ctx *ctx,
size_t samples,
const unsigned char *src, ptrdiff_t src_stride,
int lsbitfirst,
float *dst, ptrdiff_t dst_stride);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* include guard DSD2PCM_H_INCLUDED */
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