227 lines
6.7 KiB
C
227 lines
6.7 KiB
C
/*
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** Copyright (C) 2002-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU Lesser General Public License as published by
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** the Free Software Foundation; either version 2.1 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU Lesser General Public License for more details.
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**
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** You should have received a copy of the GNU Lesser General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "sfconfig.h"
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#include <stdio.h>
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#include <fcntl.h>
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#include <string.h>
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#include <ctype.h>
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#include "sndfile.h"
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#include "sfendian.h"
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#include "common.h"
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/*------------------------------------------------------------------------------
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** Macros to handle big/little endian issues.
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*/
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#define SFE_HTK_BAD_FILE_LEN 1666
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#define SFE_HTK_NOT_WAVEFORM 1667
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/*------------------------------------------------------------------------------
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** Private static functions.
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*/
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static int htk_close (SF_PRIVATE *psf) ;
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static int htk_write_header (SF_PRIVATE *psf, int calc_length) ;
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static int htk_read_header (SF_PRIVATE *psf) ;
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/*------------------------------------------------------------------------------
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** Public function.
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*/
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int
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htk_open (SF_PRIVATE *psf)
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{ int subformat ;
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int error = 0 ;
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if (psf->is_pipe)
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return SFE_HTK_NO_PIPE ;
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if (psf->file.mode == SFM_READ || (psf->file.mode == SFM_RDWR && psf->filelength > 0))
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{ if ((error = htk_read_header (psf)))
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return error ;
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} ;
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subformat = SF_CODEC (psf->sf.format) ;
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if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
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{ if ((SF_CONTAINER (psf->sf.format)) != SF_FORMAT_HTK)
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return SFE_BAD_OPEN_FORMAT ;
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psf->endian = SF_ENDIAN_BIG ;
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if (htk_write_header (psf, SF_FALSE))
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return psf->error ;
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psf->write_header = htk_write_header ;
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} ;
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psf->container_close = htk_close ;
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psf->blockwidth = psf->bytewidth * psf->sf.channels ;
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switch (subformat)
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{ case SF_FORMAT_PCM_16 : /* 16-bit linear PCM. */
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error = pcm_init (psf) ;
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break ;
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default : break ;
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} ;
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return error ;
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} /* htk_open */
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/*------------------------------------------------------------------------------
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*/
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static int
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htk_close (SF_PRIVATE *psf)
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{
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if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
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htk_write_header (psf, SF_TRUE) ;
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return 0 ;
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} /* htk_close */
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static int
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htk_write_header (SF_PRIVATE *psf, int calc_length)
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{ sf_count_t current ;
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int sample_count, sample_period ;
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current = psf_ftell (psf) ;
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if (calc_length)
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psf->filelength = psf_get_filelen (psf) ;
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/* Reset the current header length to zero. */
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psf->header [0] = 0 ;
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psf->headindex = 0 ;
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psf_fseek (psf, 0, SEEK_SET) ;
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if (psf->filelength > 12)
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sample_count = (psf->filelength - 12) / 2 ;
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else
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sample_count = 0 ;
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sample_period = 10000000 / psf->sf.samplerate ;
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psf_binheader_writef (psf, "E444", sample_count, sample_period, 0x20000) ;
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/* Header construction complete so write it out. */
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psf_fwrite (psf->header, psf->headindex, 1, psf) ;
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if (psf->error)
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return psf->error ;
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psf->dataoffset = psf->headindex ;
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if (current > 0)
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psf_fseek (psf, current, SEEK_SET) ;
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return psf->error ;
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} /* htk_write_header */
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/*
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** Found the following info in a comment block within Bill Schottstaedt's
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** sndlib library.
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**
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** HTK format files consist of a contiguous sequence of samples preceded by a
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** header. Each sample is a vector of either 2-byte integers or 4-byte floats.
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** 2-byte integers are used for compressed forms as described below and for
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** vector quantised data as described later in section 5.11. HTK format data
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** files can also be used to store speech waveforms as described in section 5.8.
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**
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** The HTK file format header is 12 bytes long and contains the following data
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** nSamples -- number of samples in file (4-byte integer)
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** sampPeriod -- sample period in 100ns units (4-byte integer)
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** sampSize -- number of bytes per sample (2-byte integer)
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** parmKind -- a code indicating the sample kind (2-byte integer)
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**
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** The parameter kind consists of a 6 bit code representing the basic
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** parameter kind plus additional bits for each of the possible qualifiers.
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** The basic parameter kind codes are
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**
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** 0 WAVEFORM sampled waveform
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** 1 LPC linear prediction filter coefficients
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** 2 LPREFC linear prediction reflection coefficients
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** 3 LPCEPSTRA LPC cepstral coefficients
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** 4 LPDELCEP LPC cepstra plus delta coefficients
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** 5 IREFC LPC reflection coef in 16 bit integer format
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** 6 MFCC mel-frequency cepstral coefficients
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** 7 FBANK log mel-filter bank channel outputs
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** 8 MELSPEC linear mel-filter bank channel outputs
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** 9 USER user defined sample kind
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** 10 DISCRETE vector quantised data
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**
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** and the bit-encoding for the qualifiers (in octal) is
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** _E 000100 has energy
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** _N 000200 absolute energy suppressed
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** _D 000400 has delta coefficients
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** _A 001000 has acceleration coefficients
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** _C 002000 is compressed
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** _Z 004000 has zero mean static coef.
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** _K 010000 has CRC checksum
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** _O 020000 has 0'th cepstral coef.
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*/
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static int
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htk_read_header (SF_PRIVATE *psf)
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{ int sample_count, sample_period, marker ;
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psf_binheader_readf (psf, "pE444", 0, &sample_count, &sample_period, &marker) ;
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if (2 * sample_count + 12 != psf->filelength)
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return SFE_HTK_BAD_FILE_LEN ;
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if (marker != 0x20000)
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return SFE_HTK_NOT_WAVEFORM ;
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psf->sf.channels = 1 ;
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if (sample_period > 0)
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{ psf->sf.samplerate = 10000000 / sample_period ;
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psf_log_printf (psf, "HTK Waveform file\n Sample Count : %d\n Sample Period : %d => %d Hz\n",
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sample_count, sample_period, psf->sf.samplerate) ;
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}
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else
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{ psf->sf.samplerate = 16000 ;
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psf_log_printf (psf, "HTK Waveform file\n Sample Count : %d\n Sample Period : %d (should be > 0) => Guessed sample rate %d Hz\n",
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sample_count, sample_period, psf->sf.samplerate) ;
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} ;
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psf->sf.format = SF_FORMAT_HTK | SF_FORMAT_PCM_16 ;
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psf->bytewidth = 2 ;
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/* HTK always has a 12 byte header. */
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psf->dataoffset = 12 ;
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psf->endian = SF_ENDIAN_BIG ;
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psf->datalength = psf->filelength - psf->dataoffset ;
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psf->blockwidth = psf->sf.channels * psf->bytewidth ;
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if (! psf->sf.frames && psf->blockwidth)
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psf->sf.frames = (psf->filelength - psf->dataoffset) / psf->blockwidth ;
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return 0 ;
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} /* htk_read_header */
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