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