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#ifndef __AW_ALSA_PCM_EXTPLUG_H
#define __AW_ALSA_PCM_EXTPLUG_H

#include <aw-alsa-lib/pcm.h>

/** hw constraints for extplug */
enum {
    SND_PCM_EXTPLUG_HW_FORMAT,  /**< format */
    SND_PCM_EXTPLUG_HW_CHANNELS,    /**< channels */
    SND_PCM_EXTPLUG_HW_PARAMS   /**< max number of hw constraints */
};

/** Handle of external filter plugin */
typedef struct snd_pcm_extplug snd_pcm_extplug_t;
/** Callback table of extplug */
typedef struct snd_pcm_extplug_callback snd_pcm_extplug_callback_t;

/** Handle of extplug */
struct snd_pcm_extplug {
    /**
     * name of this plugin; must be filled before calling #snd_pcm_extplug_create()
     */
    const char *name;
    /**
     * callbacks of this plugin; must be filled before calling #snd_pcm_extplug_create()
     */
    const snd_pcm_extplug_callback_t *callback;
    /**
     * private data, which can be used freely in the driver callbacks
     */
    void *private_data;
    /**
     * PCM handle filled by #snd_pcm_extplug_create()
     */
    snd_pcm_t *pcm;
    /**
     * stream direction; read-only status
     */
    snd_pcm_stream_t stream;
    /**
     * format hw parameter; filled after hw_params is caled
     */
    snd_pcm_format_t format;
    /**
     * subformat hw parameter; filled after hw_params is caled
     */
    //snd_pcm_subformat_t subformat;
    /**
     * channels hw parameter; filled after hw_params is caled
     */
    unsigned int channels;
    /**
     * rate hw parameter; filled after hw_params is caled
     */
    unsigned int rate;
    /**
     * slave_format hw parameter; filled after hw_params is caled
     */
    snd_pcm_format_t slave_format;
    /**
     * slave_channels hw parameter; filled after hw_params is caled
     */
    unsigned int slave_channels;
};

/** Callback table of extplug */
struct snd_pcm_extplug_callback {
    /**
     * transfer between source and destination; this is a required callback
     */
    snd_pcm_sframes_t (*transfer)(snd_pcm_extplug_t *ext,
                      const snd_pcm_channel_area_t *dst_areas,
                      snd_pcm_uframes_t dst_offset,
                      const snd_pcm_channel_area_t *src_areas,
                      snd_pcm_uframes_t src_offset,
                      snd_pcm_uframes_t size);
    /**
     * close the PCM; optional
     */
    int (*close)(snd_pcm_extplug_t *ext);
    /**
     * hw_params; optional
     */
    int (*hw_params)(snd_pcm_extplug_t *ext, snd_pcm_hw_params_t *params);
    /**
     * hw_free; optional
     */
    int (*hw_free)(snd_pcm_extplug_t *ext);
    /**
     * dump; optional
     */
    void (*dump)(snd_pcm_extplug_t *ext);
    /**
     * init; optional initialization called at prepare or reset
     */
    int (*init)(snd_pcm_extplug_t *ext);
    /**
     * query the channel maps; optional; since v1.0.2
     */
    //snd_pcm_chmap_query_t **(*query_chmaps)(snd_pcm_extplug_t *ext);
    /**
     * get the channel map; optional; since v1.0.2
     */
    //snd_pcm_chmap_t *(*get_chmap)(snd_pcm_extplug_t *ext);
    /**
     * set the channel map; optional; since v1.0.2
     */
    //int (*set_chmap)(snd_pcm_extplug_t *ext, const snd_pcm_chmap_t *map);
};

int snd_pcm_extplug_create(snd_pcm_extplug_t *extplug, const char *name,
               const char *spcm_name, snd_pcm_stream_t stream, int mode);

/* clear hw_parameter setting */
void snd_pcm_extplug_params_reset(snd_pcm_extplug_t *ext);

/* hw_parameter setting */
int snd_pcm_extplug_set_param_list(snd_pcm_extplug_t *extplug, int type, unsigned int num_list, const unsigned int *list);
int snd_pcm_extplug_set_param_minmax(snd_pcm_extplug_t *extplug, int type, unsigned int min, unsigned int max);
int snd_pcm_extplug_set_slave_param_list(snd_pcm_extplug_t *extplug, int type, unsigned int num_list, const unsigned int *list);
int snd_pcm_extplug_set_slave_param_minmax(snd_pcm_extplug_t *extplug, int type, unsigned int min, unsigned int max);

/**
 * set the parameter constraint with a single value
 */
static __inline__ int snd_pcm_extplug_set_param(snd_pcm_extplug_t *extplug, int type, unsigned int val)
{
    return snd_pcm_extplug_set_param_list(extplug, type, 1, &val);
}

/**
 * set the parameter constraint for slave PCM with a single value
 */
static __inline__ int snd_pcm_extplug_set_slave_param(snd_pcm_extplug_t *extplug, int type, unsigned int val)
{
    return snd_pcm_extplug_set_slave_param_list(extplug, type, 1, &val);
}

#endif /* __AW_ALSA_PCM_EXTPLUG_H */