software/c++/ruwaicom/src/libmseed/steimdata.h

   1 /***************************************************************************
   2  * steimdata.h:
   3  *
   4  * Declarations for Steim compression routines.
   5  *
   6  * modified: 2004.278
   7  ***************************************************************************/
   8
   9 #ifndef STEIMDATA_H
  10 #define STEIMDATA_H 1
  11
  12 #ifdef __cplusplus
  13 extern "C" {
  14 #endif
  15
  16 #define STEIM1_FRAME_MAX_SAMPLES  60
  17 #define STEIM2_FRAME_MAX_SAMPLES  105
  18
  19 #define VALS_PER_FRAME  15      /* # of ints for data per frame.*/
  20
  21 #define STEIM1_SPECIAL_MASK     0
  22 #define STEIM1_BYTE_MASK        1
  23 #define STEIM1_HALFWORD_MASK    2
  24 #define STEIM1_FULLWORD_MASK    3
  25
  26 #define STEIM2_SPECIAL_MASK     0
  27 #define STEIM2_BYTE_MASK        1
  28 #define STEIM2_123_MASK         2
  29 #define STEIM2_567_MASK         3
  30
  31 typedef union u_diff {          /* union for Steim objects.     */
  32   int8_t          byte[4];      /* 4 1-byte differences.        */
  33   int16_t         hw[2];        /* 2 halfword differences.      */
  34   int32_t         fw;           /* 1 fullword difference.       */
  35 } U_DIFF;
  36
  37 typedef struct frame {          /* frame in a seed data record. */
  38   uint32_t        ctrl;         /* control word for frame.      */
  39   U_DIFF          w[15];        /* compressed data.             */
  40 } FRAME;
  41
  42 typedef struct dframes {        /* seed data frames.            */
  43     FRAME f[1];                 /* data record header frames.   */
  44 } DFRAMES;
  45
  46
  47 #ifdef __cplusplus
  48 }
  49 #endif
  50
  51 #endif /* STEIMDATA_H */