#ifndef __LIBPIPELINE_H__
#define __LIBPIPELINE_H__

typedef struct pl_pipleline pl_pipeline;

typedef void *(*pl_fetch)(void *opaque);
typedef void *(*pl_process)(void *element, void *opaque);
typedef void (*pl_ready)(void *element, void *opaque);
typedef void (*pl_sink)(void *element, void *opaque);

struct pl_stage {
        struct pl_sage *next;
        int nqueue;
        pl_process *process;
        void *opaque;
};

struct pl_source {
        struct pl_sage *next;
        int nqueue;
        pl_fetch *fetch;
        void *opaque;
};

struct pl_source *pl_source_alloc(int nqueue, pl_fetch *fetch);
struct pl_stage *pl_stage_alloc(int nqueue, pl_process *process);
void pl_stage_free(struct pl_stage **stage);
void pl_source_and_stages_free(struct pl_source **stage);

int pl_stage_append(struct pl_source *source, struct pl_stage *stage);

pl_pipeline *pl_create(struct pl_source *source, pl_sink *sink, void *opaque);
int pl_start(pl_pipeline *pipeline);
int pl_stop(pl_pipeline *pipeline);
void pl_free(pl_pipeline **pipeline);

int pl_inject(pl_pipeline *pipeline, void *element);
void *pl_retrive(pl_pipeline *pipeline, int timeout_ms);

#endif //__LIBPIPELINE_H__