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Add an option to use the HRTF time delay measured from the dataset

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This commit is contained in:
Chris Robinson 2013-12-18 12:43:59 -08:00
parent 0653680690
commit cd90bdd9bd
1 changed files with 82 additions and 13 deletions
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95
utils/makehrtf.c
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@ -2,7 +2,7 @@
* HRTF utility for producing and demonstrating the process of creating an
* OpenAL Soft compatible HRIR data set.
*
* Copyright (C) 2011-2012 Christopher Fitzgerald
* Copyright (C) 2011-2013 Christopher Fitzgerald
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -162,6 +162,7 @@
#define DEFAULT_SURFACE (1)
#define DEFAULT_LIMIT (24.0)
#define DEFAULT_TRUNCSIZE (32)
#define DEFAULT_HEAD_MODEL (HM_DATASET)
// The four-character-codes for RIFF/RIFX WAVE file chunks.
#define FOURCC_RIFF (0x46464952) // 'RIFF'
@ -208,6 +209,13 @@ enum ElementTypeT {
ET_FP // Floating-point elements.
};
// Head model used for calculating the impulse delays.
enum HeadModelT {
HM_NONE = 0,
HM_DATASET , // Measure the onset from the dataset.
HM_SPHERE // Calculate the onset using a spherical head model.
};
// Desired output format from the command line.
enum OutputFormatT {
OF_NONE = 0,
@ -239,6 +247,7 @@ typedef unsigned long long uint8;
typedef enum ByteOrderT ByteOrderT;
typedef enum SourceFormatT SourceFormatT;
typedef enum ElementTypeT ElementTypeT;
typedef enum HeadModelT HeadModelT;
typedef enum OutputFormatT OutputFormatT;
typedef struct TokenReaderT TokenReaderT;
@ -1683,6 +1692,25 @@ static int LoadSource (SourceRefT * src, const uint hrirRate, const uint n, doub
return (result);
}
// Calculate the onset time of an HRIR and average it with any existing
// timing for its elevation and azimuth.
static void AverageHrirOnset (const double * hrir, const double f, const uint ei, const uint ai, const HrirDataT * hData) {
double mag;
uint n, i, j;
mag = 0.0;
n = hData -> mIrPoints;
for (i = 0; i < n; i ++)
mag = fmax (fabs (hrir [i]), mag);
mag *= 0.15;
for (i = 0; i < n; i ++) {
if (fabs (hrir [i]) >= mag)
break;
}
j = hData -> mEvOffset [ei] + ai;
hData -> mHrtds [j] = Lerp (hData -> mHrtds [j], ((double) i) / hData -> mIrRate, f);
}
// Calculate the magnitude response of an HRIR and average it with any
// existing responses for its elevation and azimuth.
static void AverageHrirMagnitude (const double * hrir, const double f, const uint ei, const uint ai, const HrirDataT * hData) {
@ -1867,6 +1895,26 @@ static void CalcAzIndices (const HrirDataT * hData, const uint ei, const double
(* jf) = af;
}
// Synthesize any missing onset timings at the bottom elevations. This just
// blends between slightly exaggerated known onsets. Not an accurate model.
static void SynthesizeOnsets (HrirDataT * hData) {
uint oi, e, a, j0, j1;
double t, of, jf;
oi = hData -> mEvStart;
t = 0.0;
for (a = 0; a < hData -> mAzCount [oi]; a ++)
t += hData -> mHrtds [hData -> mEvOffset [oi] + a];
hData -> mHrtds [0] = 1.32e-4 + (t / hData -> mAzCount [oi]);
for (e = 1; e < hData -> mEvStart; e ++) {
of = ((double) e) / hData -> mEvStart;
for (a = 0; a < hData -> mAzCount [e]; a ++) {
CalcAzIndices (hData, oi, a * 2.0 * M_PI / hData -> mAzCount [e], & j0, & j1, & jf);
hData -> mHrtds [hData -> mEvOffset [e] + a] = Lerp (hData -> mHrtds [0], Lerp (hData -> mHrtds [j0], hData -> mHrtds [j1], jf), of);
}
}
}
/* Attempt to synthesize any missing HRIRs at the bottom elevations. Right
* now this just blends the lowest elevation HRIRs together and applies some
* attenuation and high frequency damping. It is a simple, if inaccurate
@ -1966,9 +2014,9 @@ static double CalcLTD (const double ev, const double az, const double rad, const
return (dlp / 343.3);
}
// Calculate the effective head-related time delays for the each HRIR, now
// that they are minimum-phase.
static void CalculateHrtds (HrirDataT * hData) {
// Calculate the effective head-related time delays for each minimum-phase
// HRIR.
static void CalculateHrtds (const HeadModelT model, HrirDataT * hData) {
double minHrtd, maxHrtd;
uint e, a, j;
double t;
@ -1978,10 +2026,14 @@ static void CalculateHrtds (HrirDataT * hData) {
for (e = 0; e < hData -> mEvCount; e ++) {
for (a = 0; a < hData -> mAzCount [e]; a ++) {
j = hData -> mEvOffset [e] + a;
t = CalcLTD ((-90.0 + (e * 180.0 / (hData -> mEvCount - 1))) * M_PI / 180.0,
(a * 360.0 / hData -> mAzCount [e]) * M_PI / 180.0,
hData -> mRadius, hData -> mDistance);
hData -> mHrtds [j] = t;
if (model == HM_DATASET) {
t = hData -> mHrtds [j];
} else {
t = CalcLTD ((-90.0 + (e * 180.0 / (hData -> mEvCount - 1))) * M_PI / 180.0,
(a * 360.0 / hData -> mAzCount [e]) * M_PI / 180.0,
hData -> mRadius, hData -> mDistance);
hData -> mHrtds [j] = t;
}
maxHrtd = fmax (t, maxHrtd);
minHrtd = fmin (t, minHrtd);
}
@ -2372,7 +2424,7 @@ static int ReadSourceRef (TokenReaderT * tr, SourceRefT * src) {
}
// Process the list of sources in the data set definition.
static int ProcessSources (TokenReaderT * tr, HrirDataT * hData) {
static int ProcessSources (const HeadModelT model, TokenReaderT * tr, HrirDataT * hData) {
uint * setCount = NULL, * setFlag = NULL;
double * hrir = NULL;
uint line, col, ei, ai;
@ -2393,6 +2445,8 @@ static int ProcessSources (TokenReaderT * tr, HrirDataT * hData) {
for (;;) {
if (ReadSourceRef (tr, & src)) {
if (LoadSource (& src, hData -> mIrRate, hData -> mIrPoints, hrir)) {
if (model == HM_DATASET)
AverageHrirOnset (hrir, 1.0 / factor, ei, ai, hData);
AverageHrirMagnitude (hrir, 1.0 / factor, ei, ai, hData);
factor += 1.0;
if (! TrIsOperator (tr, "+"))
@ -2452,7 +2506,7 @@ static int ProcessSources (TokenReaderT * tr, HrirDataT * hData) {
* resulting data set as desired. If the input name is NULL it will read
* from standard input.
*/
static int ProcessDefinition (const char * inName, const uint outRate, const uint fftSize, const int equalize, const int surface, const double limit, const uint truncSize, const OutputFormatT outFormat, const char * outName) {
static int ProcessDefinition (const char * inName, const uint outRate, const uint fftSize, const int equalize, const int surface, const double limit, const uint truncSize, const HeadModelT model, const OutputFormatT outFormat, const char * outName) {
FILE * fp = NULL;
TokenReaderT tr;
HrirDataT hData;
@ -2486,7 +2540,7 @@ static int ProcessDefinition (const char * inName, const uint outRate, const uin
}
hData . mHrirs = CreateArray (hData . mIrCount * hData . mIrSize);
hData . mHrtds = CreateArray (hData . mIrCount);
if (! ProcessSources (& tr, & hData)) {
if (! ProcessSources (model, & tr, & hData)) {
DestroyArray (hData . mHrtds);
DestroyArray (hData . mHrirs);
if (inName != NULL)
@ -2512,11 +2566,13 @@ static int ProcessDefinition (const char * inName, const uint outRate, const uin
fprintf (stdout, "Truncating minimum-phase HRIRs...\n");
hData . mIrPoints = truncSize;
fprintf (stdout, "Synthesizing missing elevations...\n");
if (model == HM_DATASET)
SynthesizeOnsets (& hData);
SynthesizeHrirs (& hData);
fprintf (stdout, "Normalizing final HRIRs...\n");
NormalizeHrirs (& hData);
fprintf (stdout, "Calculating impulse delays...\n");
CalculateHrtds (& hData);
CalculateHrtds (model, & hData);
snprintf (rateStr, 8, "%u", hData . mIrRate);
StrSubst (outName, "%r", rateStr, MAX_PATH_LEN, expName);
switch (outFormat) {
@ -2547,6 +2603,7 @@ int main (const int argc, const char * argv []) {
int equalize, surface;
double limit;
uint truncSize;
HeadModelT model;
char * end = NULL;
if (argc < 2) {
@ -2573,6 +2630,8 @@ int main (const int argc, const char * argv []) {
fprintf (stdout, " average (default: %.2f).\n", DEFAULT_LIMIT);
fprintf (stdout, " -w=<points> Specify the size of the truncation window that's applied\n");
fprintf (stdout, " after minimum-phase reconstruction (default: %u).\n", DEFAULT_TRUNCSIZE);
fprintf (stdout, " -d={dataset| Specify the model used for calculating the head-delay timing\n");
fprintf (stdout, " sphere} values (default: %s).\n", ((DEFAULT_HEAD_MODEL == HM_DATASET) ? "dataset" : "sphere"));
fprintf (stdout, " -i=<filename> Specify an HRIR definition file to use (defaults to stdin).\n");
fprintf (stdout, " -o=<filename> Specify an output file. Overrides command-selected default.\n");
fprintf (stdout, " Use of '%%r' will be substituted with the data set sample rate.\n");
@ -2601,6 +2660,7 @@ int main (const int argc, const char * argv []) {
surface = DEFAULT_SURFACE;
limit = DEFAULT_LIMIT;
truncSize = DEFAULT_TRUNCSIZE;
model = DEFAULT_HEAD_MODEL;
while (argi < argc) {
if (strncmp (argv [argi], "-r=", 3) == 0) {
outRate = strtoul (& argv [argi] [3], & end, 10);
@ -2648,6 +2708,15 @@ int main (const int argc, const char * argv []) {
fprintf (stderr, "Error: Expected a value from %u to %u in multiples of %u for '-w'.\n", MIN_TRUNCSIZE, MAX_TRUNCSIZE, MOD_TRUNCSIZE);
return (-1);
}
} else if (strncmp (argv [argi], "-d=", 3) == 0) {
if (strcmp (& argv [argi] [3], "dataset") == 0) {
model = HM_DATASET;
} else if (strcmp (& argv [argi] [3], "sphere") == 0) {
model = HM_SPHERE;
} else {
fprintf (stderr, "Error: Expected 'dataset' or 'sphere' for '-d'.\n");
return (-1);
}
} else if (strncmp (argv [argi], "-i=", 3) == 0) {
inName = & argv [argi] [3];
} else if (strncmp (argv [argi], "-o=", 3) == 0) {
@ -2658,7 +2727,7 @@ int main (const int argc, const char * argv []) {
}
argi ++;
}
if (! ProcessDefinition (inName, outRate, fftSize, equalize, surface, limit, truncSize, outFormat, outName))
if (! ProcessDefinition (inName, outRate, fftSize, equalize, surface, limit, truncSize, model, outFormat, outName))
return (-1);
fprintf (stdout, "Operation completed.\n");
return (0);