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#include "main.h"
#include "../nu/AutoLock.h"
#include <math.h>
#include "WinampAttributes.h"
#include "../nsutil/stats.h"
using namespace Nullsoft::Utility;
struct VU_list
{
int timestamp;
unsigned char data[2]; // two channels for now, we'll worry about more later
};
static VU_list *vu_bufs;
static int vu_position, vu_length, vu_size;
static int last_pos;
LockGuard VU_guard GUARDNAME("VU Guard");
void vu_init(int numframes, int srate)
{
AutoLock lock (VU_guard LOCKNAME("vu_init"));
vu_length = 0;
if (numframes < 1) numframes = 1;
if (numframes > vu_size)
{
free(vu_bufs);
vu_bufs = (VU_list *)calloc(numframes, sizeof(VU_list));
vu_size = numframes;
}
vu_position = 0;
vu_length = numframes;
last_pos = 0;
}
void vu_deinit(void)
{
AutoLock lock (VU_guard LOCKNAME("vu_deinit"));
vu_length = 0;
}
void VU_Create()
{
vu_length = vu_size = 0;
}
void VU_Destroy()
{
free(vu_bufs);
vu_bufs = 0;
vu_size = 0;
}
int vu_add(char *values, int timestamp)
{
AutoLock lock (VU_guard LOCKNAME("vu_add"));
if (!vu_bufs || vu_length == 0)
return 1;
if (vu_length < 2)
{
vu_position = 0;
}
vu_bufs[vu_position].timestamp = timestamp;//+600;
memcpy(vu_bufs[vu_position].data, values, 2);
vu_position++;
if (vu_position >= vu_length)
vu_position -= vu_length;
return 0;
}
bool vu_get(int timestamp, unsigned char data[2])
{
int x, closest = 1000000, closest_v = -1;
int i;
AutoLock lock (VU_guard LOCKNAME("vu_get"));
if (!vu_bufs || vu_length==0)
return false;
if (vu_length < 2)
{
memcpy(data, vu_bufs[0].data, 2);
return true;
}
i = last_pos;
for (x = 0; x < vu_length; x ++)
{
int d;
if (i >= vu_length) i = 0;
d = timestamp - vu_bufs[i].timestamp;
if (d < 0) d = -d;
if (d < closest)
{
closest = d;
closest_v = i;
}
else if (closest < 200) break;
i++;
}
if (closest < 200 && closest_v >= 0)
{
last_pos = closest_v;
memcpy(data, vu_bufs[closest_v].data, 2);
return true;
}
return false;
}
int export_vu_get(int channel)
{
if (channel>2 || channel<0)
return -1;
unsigned char data[2];
int now = in_getouttime();
if (vu_get(now, data))
return data[channel];
else
return -1;
}
float historyL=0, historyR=0;
static void FillFloat(float *floatBuf, void *samples, size_t bps, size_t numSamples, size_t numChannels, float preamp)
{
switch(bps)
{
case 8:
{
preamp /= 256.0f;
unsigned __int8 *samples8 = (unsigned __int8 *)samples;
for (size_t x = 0; x != numSamples; x ++)
{
floatBuf[x] = (float)(samples8[x*numChannels]-128) * preamp;
}
}
break;
case 16:
{
preamp/=32768.0f;
short *samples16 = (short *)samples;
for (size_t x = 0; x != numSamples; x ++)
{
floatBuf[x] = (float)samples16[x*numChannels] * preamp;
}
}
break;
case 24:
{
preamp/=2147483648.0f;
unsigned __int8 *samples8 = (unsigned __int8 *)samples;
for (size_t x = 0; x != numSamples; x ++)
{
long temp = (((long)samples8[0]) << 8);
temp = temp | (((long)samples8[1]) << 16);
temp = temp | (((long)samples8[2]) << 24);
floatBuf[x] = (float)temp * preamp;
samples8+=3*numChannels;
}
}
break;
case 32:
{
preamp /= 2147483648.0f;
int32_t *samples32 = (int32_t *)samples;
for (size_t x = 0; x != numSamples; x ++)
{
floatBuf[x] = (float)samples32[x*numChannels] * preamp;
}
}
break;
}
}
void calcVuData(unsigned char *out, char *data, const int channels, const int bits)
{
static float left_peak=10.0f, left_history=0.0f;
static float right_peak=10.0f, right_history=0.0f;
float left[576] = {0}, right[576] = {0};
float left_rms, right_rms;
float scale = 1.0;
if (config_replaygain)
scale= 1.0f/pow(10.0f, config_replaygain_non_rg_gain.GetFloat() / 20.0f);
FillFloat(left, data, bits, 576, channels, scale);
if (channels > 1)
FillFloat(right, data+(bits/8), bits, 576, channels, scale);
else
memcpy(right, left, 576*sizeof(float));
nsutil_stats_RMS_F32(left, 576, &left_rms);
nsutil_stats_RMS_F32(right, 576, &right_rms);
// use a simple one-pole IIR to 'adjust' the vu meter to the songs loudness level
// the small constant
left_peak = 0.855f*left_peak + 0.095f*left_rms + 0.5f;
left_rms = 10.0f*left_rms /left_peak;
right_peak = 0.855f*right_peak + 0.095f*right_rms + 0.5f;
right_rms = 10.0f*right_rms /right_peak;
float left_db=left_rms*left_rms;
float right_db=right_rms*right_rms;
if (left_db < left_history)
left_db = left_db*0.2f + left_history*0.8f;
else
left_db = left_db*0.75f + left_history*0.25f;
if (right_db < right_history)
right_db = right_db*0.2f + right_history*0.8f;
else
right_db = right_db*0.75f + right_history*0.25f;
left_history = left_db;
right_history = right_db;
left_db = min(left_db, 255);
left_db = max(left_db, 0);
right_db = min(right_db, 255);
right_db = max(right_db, 0);
out[0] = (unsigned char)(left_db );
out[1] = (unsigned char)(right_db);
}
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