myvtm/Other/libaudioframework/audiocontext.h

#ifndef __AUDIOCONTEXT_H__
#define __AUDIOCONTEXT_H__

#pragma once

#ifdef __cplusplus
extern "C" {
#endif

#include "audioengine.h"
#include "audiodriver.h"

typedef struct audiocontext_t audiocontext_t;
typedef struct audiostream_t audiostream_t;
typedef struct audiodriver_t audiodriver_t;

apr_status_t audiocontext_create(apr_pool_t *pool, audioengine_t *e, audiocontext_t **p_ctx);
void audiocontext_destroy(audiocontext_t *ctx);
audioengine_t *audiocontext_get_engine(audiocontext_t *ctx);
apr_status_t audiocontext_lock(audiocontext_t *ctx);
apr_status_t audiocontext_unlock(audiocontext_t *ctx);
apr_status_t audiocontext_add_driver(audiocontext_t *ctx, audiodriver_t *dev);
apr_status_t audiocontext_remove_driver(audiocontext_t *ctx, audiodriver_t *dev);
apr_status_t audiocontext_add_stream(audiocontext_t *ctx, audiostream_t *stream);
apr_status_t audiocontext_remove_stream(audiocontext_t *ctx, audiostream_t *stream);

// stream event handler, 
// return 0: pass to next handler, 1: processed
typedef int (__stdcall *audiocontext_event_handler)(audiocontext_t *ctx, 
													void *user_data, 
													int bstream, 
													audiostream_t *stream, 
													int evt, 
													int param1, 
													int param2);

#define EVENT_HANDLER_PRIOIRY_HIGHEST	31
#define EVENT_HANDLER_PRIOIRY_HIGH		15
#define EVENT_HANDLER_PRIOIRY_MIDDLE	7
#define EVENT_HANDLER_PRIOIRY_LOW		3
#define EVENT_HANDLER_PRIOIRY_LOWEST	0

apr_status_t audiocontext_put_stream_event(audiocontext_t *ctx, audiostream_t *stream, int evt, int param1, int param2);
apr_status_t audiocontext_put_driver_event(audiocontext_t *ctx, audiodriver_t *driver, int evt, int param1, int param2);
apr_status_t audiocontext_add_event_handler(audiocontext_t *ctx, int priority, audiocontext_event_handler handler, void *user_data);
apr_status_t audiocontext_remove_event_handler(audiocontext_t *ctx, audiocontext_event_handler handler);

#ifdef __cplusplus
} // extern "C" {
#endif

#endif //__AUDIOCONTEXT_H__