#ifndef AUDIOPIPELINE_AUDIO_INTERNAL_H__INCLUDED
#define AUDIOPIPELINE_AUDIO_INTERNAL_H__INCLUDED
#include "audio.h"

struct _AudioPipelineElement {
    void *ctx; /* Internal scratchspace/context */

    AudioPipelineStatus (*start)(struct _AudioPipelineElement *self);
    AudioPipelineStatus (*reset)(struct _AudioPipelineElement *self);
    AudioPipelineStatus (*stop)(struct _AudioPipelineElement *self);

    AudioPipelineStatus (*push)(struct _AudioPipelineElement *self, AudioBuffer *buffer);
    AudioPipelineStatus (*link)(struct _AudioPipelineElement *self, struct _AudioPipelineElement *source);
    char *(*describe)(struct _AudioPipelineElement *self);
    void (*destroy)(struct _AudioPipelineElement *self);

    AudioPipelineElementType type;
    
    /* output format */
    char format[4];
    uint8_t channels;
    uint8_t bits_per_sample;
    uint32_t sample_rate;

    /* Set in pipeline assembly method */
    struct _AudioPipelineElement *next;
    AudioPipeline *pipeline;
};

// Some NOP functions to be used by all elements to avoid creating a lot of stub functions

AudioPipelineStatus sink_nop(AudioPipelineElement *self);

AudioPipelineStatus source_start_nop(AudioPipelineElement *self);
AudioPipelineStatus source_reset_nop(AudioPipelineElement *self);
AudioPipelineStatus source_stop_nop(AudioPipelineElement *self);
AudioPipelineStatus source_nop(AudioPipelineElement *self);

AudioPipelineStatus filter_start_nop(AudioPipelineElement *self);
AudioPipelineStatus filter_reset_nop(AudioPipelineElement *self);
AudioPipelineStatus filter_stop_nop(AudioPipelineElement *self);


#endif /* AUDIOPIPELINE_AUDIO_H__INCLUDED */