| /* |
| ** 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 */ |
| |