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/* (C) Guenter Geiger 1999 */
/*!
* \file
* \author Guenter Geiger
*
* \brief Definitions used by both streamin~ and streamout~
*
* \todo This code does not honor network byte order.
*/
#ifndef __PD_STREAM_H
#define __PD_STREAM_H
#include <inttypes.h>
/*!
* \brief Format identifiers for frames
*/
enum tag_format {
SF_FLOAT = 1,
SF_DOUBLE = 2,
SF_8BIT = 10,
SF_16BIT = 11,
SF_32BIT = 12,
SF_ALAW = 20,
SF_MP3 = 30
};
#define SF_SIZEOF(a) (a == SF_FLOAT ? sizeof(t_float) : a == SF_16BIT ? sizeof(short) : 1)
#ifdef __GNUC__
#define PACKED __attribute__ ((packed))
#endif
/*!
* \brief 16-byte frame header
*
* \note Version 1
*/
typedef struct _tag {
/*! Frame header version. Currently ignored in streamin, but always set
* to 1 for streamout.
*
* \todo Add version checking on incoming frames. However, this could
* break existing uses of the external. */
char version;
/*! This field identifies the type of data is in the frame payload */
char format;
/*! ??? */
int32_t count;
/*! ??? */
char channels;
/*! This indicates the full size of the frame. It is basically
* ( sizeof(t_tag) + payload length ). */
int32_t framesize;
/*! ??? */
char extension[5];
} PACKED t_tag;
/*!
* \brief A complete frame
*/
typedef struct _frame {
/*! This is the frame header that contains the metadata about the frame */
t_tag tag;
/*! This buffer stores the frame data payload. The amount of data in this
* buffer is the tag.framesize - sizeof(t_tag). Its contents can be
* interpreted according to the tag.version. */
char *data;
} t_frame;
#endif /* __PD_STREAM_H */
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