audio_filter.h

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 *    notice, this list of conditions and the following disclaimer.
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#ifndef AUDIO_FILTER_H_
#define AUDIO_FILTER_H_
 
#define AUDIO_FILTER_ABI_VERSION 3
 
#ifdef __cplusplus
extern "C" {
#endif
 
struct module;
struct audio_frame;
 
enum af_result_code{
        AF_MISCONFIGURED = -2,
        AF_FAILURE = -1,
        AF_OK = 0,
        AF_CONFIGURED_CLOSEST = 1,
        AF_HELP_SHOWN = 2,
};
 
struct audio_filter_info{
        const char *name;
 
        enum af_result_code (*init)(struct module *mod, const char *cfg, void **state);
 
        void (*done)(void *state);
 
        enum af_result_code (*configure)(void *state,
                        int bps, int ch_count, int sample_rate);
 
        void (*get_configured_in)(void *state,
                        int *bps, int *ch_count, int *sample_rate);
 
        void (*get_configured_out)(void *state,
                        int *bps, int *ch_count, int *sample_rate);
 
                //                       frame and return a different one
        enum af_result_code (*filter)(void *state, struct audio_frame **f);
};
 
struct audio_filter{
        const struct audio_filter_info *info;
        void *state;
};
 
enum af_result_code audio_filter_init(struct module *parent, const char *name, const char *cfg,
                struct audio_filter *filter);
 
void audio_filter_destroy(struct audio_filter *state);
 
enum af_result_code audio_filter_configure(struct audio_filter *state,
                int bps, int ch_count, int sample_rate);
 
void audio_filter_get_configured_out(struct audio_filter *state,
                int *bps, int *ch_count, int *sample_rate);
 
void audio_filter_get_configured_in(struct audio_filter *state,
                int *bps, int *ch_count, int *sample_rate);
 
enum af_result_code audio_filter(struct audio_filter *state, struct audio_frame **frame);
 
//void register_audio_filter(struct audio_filter_info *filter);
 
#ifdef __cplusplus
}
#endif
 
#endif //AUDIO_FILTER_H_