peak_level_meter.c
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#include "os_config.h"
#include "c_def.h"
#include "debug.h"
#include "oem.h"
#include "peak_level_meter.h"
#include "mem_reloc.h"
U16 peak_level_L;
U16 peak_level_R;
U16 attack_factor;
U16 release_factor;
void peak_level_meter_init (U16 attack_t, U16 release_t)
{
peak_level_L = 0;
peak_level_R = 0;
attack_factor = attack_t;
release_factor = release_t;
}
//void peak_level_meter_stereo (short *pBuf, unsigned short byte_len) __INTERNAL_RAM_TEXT;
#if 0
void peak_level_meter_stereo (short *pBuf, unsigned short byte_len)
{
short *pBufL, *pBufR;
U16 tmp,i;
//Left peak meter
pBufL = &pBuf[0];
pBufR = &pBuf[1];
#if 1
peak_level_L = 0;
peak_level_R = 0;
#endif
for (i=0; i<byte_len/4; i++)
{
#if 1
tmp = (U16) abs (*pBufL);
if (tmp > peak_level_L)
peak_level_L = tmp;
tmp = (U16) abs (*pBufR);
if (tmp > peak_level_R)
{
peak_level_R = tmp;
}
#else
tmp = (U16) abs (*pBufL);
if (tmp > peak_level_L)
{
peak_level_L = (U16) ((attack_factor * tmp + (0x10000-attack_factor) * peak_level_L) >> 16);
}
else
{
peak_level_L = (U16) (((0x10000-release_factor) * peak_level_L) >> 16);
}
tmp = (U16) abs (*pBufR);
if (tmp > peak_level_R)
{
peak_level_R = (U16) ((attack_factor * tmp + (0x10000-attack_factor) * peak_level_R) >>16);
}
else
{
peak_level_R = (U16) (((0x10000-release_factor) * peak_level_R) >> 16);
}
#endif
pBufL += 2;
pBufR += 2;
}
}
#else
void peak_level_meter_stereo (short *pBuf, unsigned short byte_len)
{
short *pBufL, *pBufR;
U16 tmp,i;
U16 tmp_L,tmp_R;
//Left peak meter
pBufL = &pBuf[0];
pBufR = &pBuf[1];
for (i=0; i<byte_len/4; i++)
{
//supose attack_factor = 1
tmp = (U16) abs (*pBufL);
tmp_L = ((peak_level_L * attack_factor) >> 16);
//if (tmp > peak_level_L || tmp > tmp_L)
if (tmp > peak_level_L)
{
peak_level_L = tmp;
}
else
{
peak_level_L = tmp_L;
}
tmp = (U16) abs (*pBufR);
tmp_R = ((peak_level_R * attack_factor) >> 16);
//if (tmp > peak_level_R || tmp > tmp_R)
if (tmp > peak_level_R)
{
peak_level_R = tmp;
}
else
{
peak_level_R = tmp_R;
}
pBufL += 2;
pBufR += 2;
}
}
#endif
void peak_level_meter_16bit_open (void *handle, U16 peak_updata_samples)
{
peak_level_det *pObj = handle;
pObj->peak_level = 0;
pObj->temp_peak_level = 0;
pObj->samples_cn= 0;
pObj->peak_updata_samples = peak_updata_samples;
}
U16 peak_level_meter_16bit(void *handle,short *pBuf, unsigned short byte_len)
{
peak_level_det *pObj = handle;
U16 i;
U16 tmp;
byte_len >>= 1;
for (i=0; i<byte_len; i++)
{
tmp = abs(*pBuf);
if (tmp > pObj->temp_peak_level)
{
pObj->temp_peak_level = tmp;
//pObj->temp_peak_level += ((*pBuf - pObj->temp_peak_level)>>4);
}
pBuf++;
}
pObj->samples_cn += byte_len>>1;
if ((pObj->samples_cn > pObj->peak_updata_samples)||(pObj->peak_level < pObj->temp_peak_level))
{
pObj->peak_level = pObj->temp_peak_level;
pObj->temp_peak_level >>= 1;
pObj->samples_cn = 0;
}
return (U16)pObj->peak_level;
}
U32 peak_level_meter_24bit(void *handle,int *pBuf, unsigned short byte_len)
{
peak_level_det *pObj = handle;
U16 i;
U32 tmp;
byte_len >>= 2;
for (i=0; i<byte_len; i++)
{
tmp = abs(*pBuf);
if (tmp > pObj->temp_peak_level)
{
pObj->temp_peak_level = tmp;
//pObj->temp_peak_level += ((*pBuf - pObj->temp_peak_level)>>4);
}
pBuf++;
}
pObj->samples_cn += byte_len>>1;
if ((pObj->samples_cn > pObj->peak_updata_samples)||(pObj->peak_level < pObj->temp_peak_level))
{
pObj->peak_level = pObj->temp_peak_level;
pObj->temp_peak_level >>= 1;
pObj->samples_cn = 0;
}
return pObj->peak_level;
}
void peak_level_get (U32 *pLevel_L, U32 *pLevel_R)
{
*pLevel_L = peak_level_L;
*pLevel_R = peak_level_R;
}