codecs.h

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#ifndef _CODECS_H_
#define _CODECS_H_
 
#include "ws_symbol_export.h"
#include "ws_attributes.h"
 
#include <stdbool.h>
 
#include "wsutil/wmem/wmem_map.h"
 
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

typedef struct {
    void (*register_codec_module)(void);  
} codecs_plugin;

WS_DLL_PUBLIC void codecs_register_plugin(const codecs_plugin *plug);

WS_DLL_PUBLIC void codecs_init(const char* app_env_var_prefix);

WS_DLL_PUBLIC void codecs_cleanup(void);
 
struct codec_handle;
typedef struct codec_handle *codec_handle_t;

typedef struct _codec_context_t {
    unsigned    sample_rate;  
    unsigned    channels;     
    wmem_map_t *fmtp_map;     
    void       *priv;         
} codec_context_t;
 
/*****************************************************************************/
/* Interface which must be implemented by a codec */
/* Codec decodes bytes to samples. Sample is 2 bytes! Codec writer must
 * be careful when API refers bytes and when samples and its counts.
 */
/*****************************************************************************/

typedef void *(*codec_init_fn)(codec_context_t *context);

typedef void (*codec_release_fn)(codec_context_t *context);

typedef unsigned (*codec_get_channels_fn)(codec_context_t *context);

typedef unsigned (*codec_get_frequency_fn)(codec_context_t *context);

typedef size_t (*codec_decode_fn)(codec_context_t *context,
        const void *inputBytes, size_t inputBytesSize,
        void *outputSamples, size_t *outputSamplesSize);
 
/*****************************************************************************/
/* Codec registering interface */
/*****************************************************************************/

WS_DLL_PUBLIC bool register_codec(const char *name, codec_init_fn init_fn,
        codec_release_fn release_fn, codec_get_channels_fn channels_fn,
        codec_get_frequency_fn frequency_fn, codec_decode_fn decode_fn);

WS_DLL_PUBLIC bool deregister_codec(const char *name);

WS_DLL_PUBLIC codec_handle_t find_codec(const char *name);

WS_DLL_PUBLIC void *codec_init(codec_handle_t codec, codec_context_t *context);

WS_DLL_PUBLIC void codec_release(codec_handle_t codec, codec_context_t *context);

WS_DLL_PUBLIC unsigned codec_get_channels(codec_handle_t codec, codec_context_t *context);

WS_DLL_PUBLIC unsigned codec_get_frequency(codec_handle_t codec, codec_context_t *context);

WS_DLL_PUBLIC size_t codec_decode(codec_handle_t codec, codec_context_t *context,
        const void *inputBytes, size_t inputBytesSize,
        void *outputSamples, size_t *outputSamplesSize);
 
#ifdef __cplusplus
}
#endif /* __cplusplus */
 
#endif /* _CODECS_H_ */
 
/*
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 * Local variables:
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 *
 * vi: set shiftwidth=4 tabstop=8 expandtab:
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 */