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Added -3dB normalized pan law to playptmod

CQTexperiment
Chris Moeller 2013-10-24 18:10:50 -07:00
parent c61b592f71
commit 19af37059f
1 changed files with 16 additions and 4 deletions
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20
Frameworks/playptmod/playptmod/playptmod.c
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@ -278,6 +278,7 @@ typedef struct
float *frequencyTable;
float *extendedFrequencyTable;
unsigned char *sinusTable;
int *panTable;
int minPeriod;
int maxPeriod;
int loopCounter;
@ -522,8 +523,8 @@ static void mixerSetChSource(player *p, int ch, const char *src, int length, int
static void mixerSetChPan(player *p, int ch, int pan)
{
p->v[ch].panL = 256 - pan;
p->v[ch].panR = pan;
p->v[ch].panL = p->panTable[256 - pan];
p->v[ch].panR = p->panTable[pan];
}
static void mixerSetChVol(player *p, int ch, int vol)
@ -2744,7 +2745,8 @@ void playptmod_Render(void *_p, short *target, int length)
void *playptmod_Create(int samplingFrequency)
{
player *p = (player *) calloc(1, sizeof(player));
float norm;
int i, j;
p->tempoTimerVal = (samplingFrequency * 125) / 50;
@ -2769,7 +2771,16 @@ void *playptmod_Create(int samplingFrequency)
p->extendedFrequencyTable = (float *)malloc(sizeof (float) * 1713);
for (i = 14; i <= 1712; ++i) // 0..14 will never be looked up, junk is OK
p->extendedFrequencyTable[i] = (float)samplingFrequency / (7093790.0f / (2.0f * (float)i));
p->panTable = (int *)malloc(sizeof (int) * 257);
norm = 1.0f / sinf(1.0f / (M_PI / 2));
for (i = 0; i <= 256; ++i)
{
float pan = (float)i * 1.0f / 256.0f;
// -3dB pan law ( pan = sin x/half_pi )
p->panTable[i] = 256.0f * sinf((pan) / (M_PI / 2)) * norm;
}
p->mixBufferL = (float *)malloc(soundBufferSize * sizeof (float));
p->mixBufferR = (float *)malloc(soundBufferSize * sizeof (float));
@ -2873,6 +2884,7 @@ void playptmod_Free(void *_p)
free(p->mixBufferL);
free(p->mixBufferR);
free(p->panTable);
free(p->sinusTable);
free(p->frequencyTable);
free(p->extendedFrequencyTable);