clock.c

用MPEG-4对YUV视频文件编码压缩成divx视频文件

#include "user_macro.h"
#ifdef _TRIMEDIA
#undef abs(a)
#include <tm1/tmProcessor.h>
#include <tsaClock.h>

#if 0
/* cpu frequency 178.75MHz */
#define  MS_IN_CYCLE    24027.789   /* 0xFFFFFFFF / (178.75 * 1000) */
#define  TICKS_IN_MS    178750
#define  US_IN_CYCLE    24027789   /* 0xFFFFFFFF / 178.75 */
#define  TICKS_IN_US    178.75
#endif      
#if 1              
/* cpu frequency 166MHz */
#define  MS_IN_CYCLE    25873.296   /* 0xFFFFFFFF / (166 * 1000) */
#define  TICKS_IN_MS    166000
#define  US_IN_CYCLE    25873296   /* 0xFFFFFFFF / 166 */
#define  TICKS_IN_US    166
#endif
#if 0 
/* cpu frequency 200MHz */
#define  MS_IN_CYCLE    21474.836   /* 0xFFFFFFFF / (200 * 1000) */
#define  TICKS_IN_MS    200000
#define  US_IN_CYCLE    21474836   /* 0xFFFFFFFF / 200 */
#define  TICKS_IN_US    200
#endif
Int                      ClkInstance;
ptsaClockInstanceSetup_t ClkInstanceSetup;
pprocCapabilities_t      proccap;
tmLibappErr_t            err;
tmTimeStamp_t            tmTimeStamp;

void
initClock ()
{
    tsaClockOpen (&ClkInstance);

    tsaClockGetInstanceSetup (ClkInstance, &ClkInstanceSetup);

    procGetCapabilities(&proccap);
    ClkInstanceSetup->frequency = proccap->cpuClockFrequency;
    ClkInstanceSetup->numAlarms = 0;

    tsaClockInstanceSetup (ClkInstance, ClkInstanceSetup);

    tmTimeStamp.ticks  = 0;
    tmTimeStamp.hiTicks = 0;
    tsaClockSetTime (ClkInstance, &tmTimeStamp);

    tsaClockStart (ClkInstance);
}

void
getClock (tmTimeStamp_t *tmTimeStamp)
{
    tsaClockGetTime (ClkInstance, tmTimeStamp);
}


/*
 * Note that: diffClock_tick can only be used to calcute a very small
 * time interval less than (0xffffffff / 178.75) us = 24027.789 ms ,
 * else it will be incorrect.
 */
/* ticks */
unsigned long
diffClock_tick (tmTimeStamp_t *cBegin, tmTimeStamp_t *cEnd)
{
    return ( (cEnd->ticks - cBegin->ticks) );
}

/* us */
float
diffClock_us (tmTimeStamp_t *cBegin, tmTimeStamp_t *cEnd)
{
    return ( (float)(cEnd->hiTicks - cBegin->hiTicks) * (float)US_IN_CYCLE
             + (float)(cEnd->ticks - cBegin->ticks) / (float)TICKS_IN_US );
}

/* ms */
float
diffClock (tmTimeStamp_t *cBegin, tmTimeStamp_t *cEnd)
{

    return ( (float)(cEnd->hiTicks - cBegin->hiTicks) * (float)MS_IN_CYCLE
             + (float)(cEnd->ticks - cBegin->ticks)/ (float)TICKS_IN_MS );
}

void
releaseClock ()
{
    tsaClockStop (ClkInstance);
    tsaClockClose (ClkInstance);
}
     
#endif