utils/MIT_KEMAR.def

   1 # This is a makehrtf HRIR definition file.  It is used to define the layout
   2 # and source data to be processed into an OpenAL Soft compatible HRTF.
   3 #
   4 # This definition is used to transform the left ear HRIRs from the full set
   5 # of KEMAR HRIRs provided by Bill Gardner <billg@media.mit.edu> and Keith
   6 # Martin <kdm@media.mit.edu> of MIT Media Laboratory.
   7 #
   8 # The data (full.tar.Z or full.zip) is available from:
   9 #
  10 #  http://sound.media.mit.edu/resources/KEMAR.html
  11 #
  12 # It is copyright 1994 by MIT Media Laboratory, and provided free of charge
  13 # with no restrictions on use so long as the authors (above) are cited.
  14 #
  15 # This definition is used to generate the internal HRTF table used by OpenAL
  16 # Soft.
  17
  18 # The following are the dataset metrics.  They must always be specified at
  19 # start of a definition file, but their order is not important.
  20
  21 # Sampling rate of the HRIR data (in hertz).
  22 rate     = 44100
  23
  24 # The number of points to use from the HRIR data.  This should be a
  25 # sufficiently large value (to encompass the entire impulse response).  It
  26 # cannot be smaller than the truncation size (default is 32) specified on the
  27 # command line.
  28 points   = 512
  29
  30 # A list of the number of azimuths measured for each elevation.  There must
  31 # be at least 5 elevations covering the 180 degrees for the dataset to be
  32 # viable.
  33 azimuths = 1, 12, 24, 36, 45, 56, 60, 72, 72, 72, 72, 72, 60, 56, 45, 36, 24, 12, 1
  34
  35 # The approximate radius (measured ear-to-ear) of the listener's head (in
  36 # meters).  This does not have to match the dataset, since makehrtf uses a
  37 # spherical model to reconstruct the propagation delay.
  38 radius   = 0.09
  39
  40 # The distance between the source and the listener (in meters).  This does
  41 # have to match the dataset, but it's effect is minimal at the moment due to
  42 # the coupled nature of OpenAL Soft's HRTF model.
  43 distance = 1.4
  44
  45 # Following the metrics is the list of source HRIRs for each elevation and
  46 # azimuth pair.  They don't have to be specified in order, but the final
  47 # composition must not be sparse.  They can however begin above a number of
  48 # elevations (as typical for HRIR measurements).
  49 #
  50 # The elevation and azimuth indices are used to determine the resulting polar
  51 # coordinates following OpenAL Soft's convention (-90 degree elevation
  52 # increasing counter-clockwise from the bottom; 0 degree azimuth increasing
  53 # clockwise from the front).
  54 #
  55 # More than one HRIR can be used per source, in which case the average
  56 # magnitude response of all references for that source is used.
  57 #
  58 # Source specification is of the form (~BNF):
  59 #
  60 #  source = '[' ev_index ',' az_index ']' '=' source_ref [ '+' source_ref ]*
  61 #
  62 #  ev_index   = unsigned_integer
  63 #  az_index   = unsigned_integer
  64 #  source_ref = ref_spec ':' filename
  65 #
  66 #  ref_spec = ( wave_fmt  '(' wave_parms ')' [ '@' start_sample   ] ) |
  67 #             ( bin_fmt   '(' bini_parms ')' [ '@' start_bytes    ] ) |
  68 #             ( bin_fmt   '(' binf_parms ')' [ '@' start_bytes    ] ) |
  69 #             ( ascii_fmt '(' asci_parms ')' [ '@' start_elements ] ) |
  70 #             ( ascii_fmt '(' ascf_parms ')' [ '@' start_elements ] )
  71 #  filename = double_quoted_string
  72 #
  73 #  wave_fmt       = 'wave'
  74 #  wave_parms     = channel
  75 #  bin_fmt        = 'bin_le' | 'bin_be'
  76 #  bini_parms     = 'int' ',' byte_size [ ',' bin_sig_bits ] [ ';' skip_bytes ]
  77 #  binf_parms     = 'fp'  ',' byte_size                      [ ';' skip_bytes ]
  78 #  ascii_fmt      = 'ascii'
  79 #  asci_parms     = 'int' ',' sig_bits  [ ';' skip_elements ]
  80 #  ascf_parms     = 'fp'                [ ';' skip_elements ]
  81 #  start_sample   = unsigned_integer
  82 #  start_bytes    = unsigned_integer
  83 #  start_elements = unsigned_integer
  84 #
  85 #  channel       = unsigned_integer
  86 #  byte_size     = unsigned_integer
  87 #  bin_sig_bits  = signed_integer
  88 #  skip_bytes    = unsigned_integer
  89 #  sig_bits      = unsigned_integer
  90 #  skip_elements = unsigned_integer
  91 #
  92 # For bin_sig_bits, positive values mean the significant bits start at the
  93 # MSB (padding toward the LSB) while negative values mean they start at the
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