interpretor/libsndfile-1.0.25/src/htk.c

   1 /*
   2 ** Copyright (C) 2002-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
   3 **
   4 ** This program is free software; you can redistribute it and/or modify
   5 ** it under the terms of the GNU Lesser General Public License as published by
   6 ** the Free Software Foundation; either version 2.1 of the License, or
   7 ** (at your option) any later version.
   8 **
   9 ** This program is distributed in the hope that it will be useful,
  10 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 ** GNU Lesser General Public License for more details.
  13 **
  14 ** You should have received a copy of the GNU Lesser General Public License
  15 ** along with this program; if not, write to the Free Software
  16 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17 */
  18
  19 #include        "sfconfig.h"
  20
  21 #include        <stdio.h>
  22 #include        <fcntl.h>
  23 #include        <string.h>
  24 #include        <ctype.h>
  25
  26 #include        "sndfile.h"
  27 #include        "sfendian.h"
  28 #include        "common.h"
  29
  30 /*------------------------------------------------------------------------------
  31 ** Macros to handle big/little endian issues.
  32 */
  33
  34 #define SFE_HTK_BAD_FILE_LEN    1666
  35 #define SFE_HTK_NOT_WAVEFORM    1667
  36
  37 /*------------------------------------------------------------------------------
  38 ** Private static functions.
  39 */
  40
  41 static  int             htk_close               (SF_PRIVATE *psf) ;
  42
  43 static int              htk_write_header (SF_PRIVATE *psf, int calc_length) ;
  44 static int              htk_read_header (SF_PRIVATE *psf) ;
  45
  46 /*------------------------------------------------------------------------------
  47 ** Public function.
  48 */
  49
  50 int
  51 htk_open        (SF_PRIVATE *psf)
  52 {       int             subformat ;
  53         int             error = 0 ;
  54
  55         if (psf->is_pipe)
  56                 return SFE_HTK_NO_PIPE ;
  57
  58         if (psf->file.mode == SFM_READ || (psf->file.mode == SFM_RDWR && psf->filelength > 0))
  59         {       if ((error = htk_read_header (psf)))
  60                         return error ;
  61                 } ;
  62
  63         subformat = SF_CODEC (psf->sf.format) ;
  64
  65         if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
  66         {       if ((SF_CONTAINER (psf->sf.format)) != SF_FORMAT_HTK)
  67                         return  SFE_BAD_OPEN_FORMAT ;
  68
  69                 psf->endian = SF_ENDIAN_BIG ;
  70
  71                 if (htk_write_header (psf, SF_FALSE))
  72                         return psf->error ;
  73
  74                 psf->write_header = htk_write_header ;
  75                 } ;
  76
  77         psf->container_close = htk_close ;
  78
  79         psf->blockwidth = psf->bytewidth * psf->sf.channels ;
  80
  81         switch (subformat)
  82         {       case SF_FORMAT_PCM_16 : /* 16-bit linear PCM. */
  83                                 error = pcm_init (psf) ;
  84                                 break ;
  85
  86                 default : break ;
  87                 } ;
  88
  89         return error ;
  90 } /* htk_open */
  91
  92 /*------------------------------------------------------------------------------
  93 */
  94
  95 static int
  96 htk_close       (SF_PRIVATE *psf)
  97 {
  98         if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
  99                 htk_write_header (psf, SF_TRUE) ;
 100
 101         return 0 ;
 102 } /* htk_close */
 103
 104 static int
 105 htk_write_header (SF_PRIVATE *psf, int calc_length)
 106 {       sf_count_t      current ;
 107         int                     sample_count, sample_period ;
 108
 109         current = psf_ftell (psf) ;
 110
 111         if (calc_length)
 112                 psf->filelength = psf_get_filelen (psf) ;
 113
 114         /* Reset the current header length to zero. */
 115         psf->header [0] = 0 ;
 116         psf->headindex = 0 ;
 117         psf_fseek (psf, 0, SEEK_SET) ;
 118
 119         if (psf->filelength > 12)
 120                 sample_count = (psf->filelength - 12) / 2 ;
 121         else
 122                 sample_count = 0 ;
 123
 124         sample_period = 10000000 / psf->sf.samplerate ;
 125
 126         psf_binheader_writef (psf, "E444", sample_count, sample_period, 0x20000) ;
 127
 128         /* Header construction complete so write it out. */
 129         psf_fwrite (psf->header, psf->headindex, 1, psf) ;
 130
 131         if (psf->error)
 132                 return psf->error ;
 133
 134         psf->dataoffset = psf->headindex ;
 135
 136         if (current > 0)
 137                 psf_fseek (psf, current, SEEK_SET) ;
 138
 139         return psf->error ;
 140 } /* htk_write_header */
 141
 142 /*
 143 ** Found the following info in a comment block within Bill Schottstaedt's
 144 ** sndlib library.
 145 **
 146 ** HTK format files consist of a contiguous sequence of samples preceded by a
 147 ** header. Each sample is a vector of either 2-byte integers or 4-byte floats.
 148 ** 2-byte integers are used for compressed forms as described below and for
 149 ** vector quantised data as described later in section 5.11. HTK format data
 150 ** files can also be used to store speech waveforms as described in section 5.8.
 151 **
 152 ** The HTK file format header is 12 bytes long and contains the following data
 153 **   nSamples   -- number of samples in file (4-byte integer)
 154 **   sampPeriod -- sample period in 100ns units (4-byte integer)
 155 **   sampSize   -- number of bytes per sample (2-byte integer)
 156 **   parmKind   -- a code indicating the sample kind (2-byte integer)
 157 **
 158 ** The parameter kind  consists of a 6 bit code representing the basic
 159 ** parameter kind plus additional bits for each of the possible qualifiers.
 160 ** The basic parameter kind codes are
 161 **
 162 **  0    WAVEFORM    sampled waveform
 163 **  1    LPC         linear prediction filter coefficients
 164 **  2    LPREFC      linear prediction reflection coefficients
 165 **  3    LPCEPSTRA   LPC cepstral coefficients
 166 **  4    LPDELCEP    LPC cepstra plus delta coefficients
 167 **  5    IREFC       LPC reflection coef in 16 bit integer format
 168 **  6    MFCC        mel-frequency cepstral coefficients
 169 **  7    FBANK       log mel-filter bank channel outputs
 170 **  8    MELSPEC     linear mel-filter bank channel outputs
 171 **  9    USER        user defined sample kind
 172 **  10   DISCRETE    vector quantised data
 173 **
 174 ** and the bit-encoding for the qualifiers (in octal) is
 175 **   _E   000100      has energy
 176 **   _N   000200      absolute energy suppressed
 177 **   _D   000400      has delta coefficients
 178 **   _A   001000      has acceleration coefficients
 179 **   _C   002000      is compressed
 180 **   _Z   004000      has zero mean static coef.
 181 **   _K   010000      has CRC checksum
 182 **   _O   020000      has 0'th cepstral coef.
 183 */
 184
 185 static int
 186 htk_read_header (SF_PRIVATE *psf)
 187 {       int             sample_count, sample_period, marker ;
 188
 189         psf_binheader_readf (psf, "pE444", 0, &sample_count, &sample_period, &marker) ;
 190
 191         if (2 * sample_count + 12 != psf->filelength)
 192                 return SFE_HTK_BAD_FILE_LEN ;
 193
 194         if (marker != 0x20000)
 195                 return SFE_HTK_NOT_WAVEFORM ;
 196
 197         psf->sf.channels = 1 ;
 198
 199         if (sample_period > 0)
 200         {       psf->sf.samplerate = 10000000 / sample_period ;
 201                 psf_log_printf (psf, "HTK Waveform file\n  Sample Count  : %d\n  Sample Period : %d => %d Hz\n",
 202                                         sample_count, sample_period, psf->sf.samplerate) ;
 203                 }
 204         else
 205         {       psf->sf.samplerate = 16000 ;
 206                 psf_log_printf (psf, "HTK Waveform file\n  Sample Count  : %d\n  Sample Period : %d (should be > 0) => Guessed sample rate %d Hz\n",
 207                                         sample_count, sample_period, psf->sf.samplerate) ;
 208                 } ;
 209
 210         psf->sf.format = SF_FORMAT_HTK | SF_FORMAT_PCM_16 ;
 211         psf->bytewidth = 2 ;
 212
 213         /* HTK always has a 12 byte header. */
 214         psf->dataoffset = 12 ;
 215         psf->endian = SF_ENDIAN_BIG ;
 216
 217         psf->datalength = psf->filelength - psf->dataoffset ;
 218
 219         psf->blockwidth = psf->sf.channels * psf->bytewidth ;
 220
 221         if (! psf->sf.frames && psf->blockwidth)
 222                 psf->sf.frames = (psf->filelength - psf->dataoffset) / psf->blockwidth ;
 223
 224         return 0 ;
 225 } /* htk_read_header */
 226