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path: root/utils/MIT_KEMAR.def
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# This is a makemhr HRIR definition file.  It is used to define the layout and
# source data to be processed into an OpenAL Soft compatible HRTF.
#
# This definition is used to transform the left ear HRIRs from the full set
# of KEMAR HRIRs provided by Bill Gardner <billg@media.mit.edu> and Keith
# Martin <kdm@media.mit.edu> of MIT Media Laboratory.
#
# The data (full.zip) is available from:
#
#  http://sound.media.mit.edu/resources/KEMAR.html
#
# It is copyrighted 1994 by MIT Media Laboratory, and provided free of charge
# with no restrictions on use so long as the authors (above) are cited.
#
# This definition is used to generate the default HRTF table used by OpenAL
# Soft.

# The following are the data set metrics.  They must always be specified at
# the start of a definition file, but their order is not important.

# Sampling rate of the HRIR data (in hertz).
rate     = 44100

# The channel type of incoming HRIR data (mono or stereo).  Mono channel
# inputs will result in mirroring to provide the right ear HRIRs.  If not
# specified, this defaults to mono.
type     = mono

# The number of points to use from the HRIR data.  This should be a
# sufficiently large value (to encompass the entire impulse response).  It
# cannot be smaller than the truncation size (default is 32) specified on the
# command line.
points   = 512

# The radius of the listener's head (measured ear-to-ear in meters).  The
# makemhr utility uses this value to rescale measured propagation delays when
# a custom head radius is specified on the command line.  It is also used as
# the default radius when the spherical model is used to calculate an
# approximate set of delays.  This should match the data set as close as
# possible for accurate rescaling when using the measured delays (the
# default).  At the moment, radius rescaling does not adjust HRIR coupling.
radius   = 0.09

# A list of the distances between the source and the listener (in meters) for
# each field.  These must start at or above the head radius and proceed in
# ascending order.  Since the MIT set is single-field, there is only one
# distance.
distance = 1.4

# A list of the number of azimuths measured for each elevation per field.
# Elevations are separated by commas (,) while fields are separated by
# semicolons (;).  There must be at least 5 elevations covering 180 degrees
# degrees of elevation for the data set to be viable.  The poles (first and
# last elevation) must be singular (an azimuth count of 1).
azimuths = 1, 12, 24, 36, 45, 56, 60, 72, 72, 72, 72, 72, 60, 56, 45, 36, 24, 12, 1

# Following the metrics is the list of source HRIRs for each field,
# elevation, and azimuth triplet.  They don't have to be specified in order,
# but the final composition must not be sparse.  They can however begin above
# a number of elevations (as typical for HRIR measurements).
#
# The field index is used to determine the distance coordinate (for mult-
# field HRTFs) while the elevation and azimuth indices are used to determine
# the resulting polar coordinates following OpenAL Soft's convention (-90
# degree elevation increasing counter-clockwise from the bottom; 0 degree
# azimuth increasing clockwise from the front).
#
# More than one HRIR can be used per source.  This allows the composition of
# averaged magnitude responses or the specification of stereo HRTFs.  Target
# ears must (and can only be) specified for each source when the type metric
# is set to 'stereo'.
#
# Source specification is of the form (~BNF):
#
#  source = ( sf_index | mf_index ) source_ref [ '+' source_ref ]*
#
#  sf_index = '[' ev_index ',' az_index ']' '='
#  mf_index = '[' fd_index ',' ev_index ',' az_index ']' '='
#  source_ref = mono_ref | stereo_ref
#
#  fd_index   = unsigned_integer
#  ev_index   = unsigned_integer
#  az_index   = unsigned_integer
#  mono_ref   = ref_spec ':' filename
#  stereo_ref = ref_spec ':' filename ear
#
#  ref_spec = ( wave_fmt  '(' wave_parms ')' [ '@' start_sample  ] ) |
#             ( bin_fmt   '(' bini_parms ')' [ '@' start_byte    ] ) |
#             ( bin_fmt   '(' binf_parms ')' [ '@' start_byte    ] ) |
#             ( ascii_fmt '(' asci_parms ')' [ '@' start_element ] ) |
#             ( ascii_fmt '(' ascf_parms ')' [ '@' start_element ] )
#  filename = double_quoted_string
#  ear      = 'left' | 'right'
#
#  wave_fmt      = 'wave'
#  wave_parms    = channel
#  bin_fmt       = 'bin_le' | 'bin_be'
#  bini_parms    = 'int' ',' byte_size [ ',' bin_sig_bits ] [ ';' skip_bytes ]
#  binf_parms    = 'fp'  ',' byte_size                      [ ';' skip_bytes ]
#  ascii_fmt     = 'ascii'
#  asci_parms    = 'int' ',' sig_bits  [ ';' skip_elements ]
#  ascf_parms    = 'fp'                [ ';' skip_elements ]
#  start_sample  = unsigned_integer
#  start_byte    = unsigned_integer
#  start_element = unsigned_integer
#
#  channel             = unsigned_integer
#  byte_size           = unsigned_integer
#  bin_sig_bits        = signed_integer
#  skip_bytes          = unsigned_integer
#  sig_bits            = unsigned_integer
#  skip_elements       = unsigned_integer
#
# For bin_sig_bits, positive values mean the significant bits start at the
# MSB (padding toward the LSB) while negative values mean they start at the
# LSB.

# Even though the MIT set is provided as stereo .wav files, each channel is
# for a different sized KEMAR ear.  Since it is not a stereo data set, no ear
# is specified.  The smaller KEMAR ear (in the left channel: 0) is used.
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