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/*
** 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 PVF1_MARKER (MAKE_MARKER ('P', 'V', 'F', '1'))
/*------------------------------------------------------------------------------
** Private static functions.
*/
static int pvf_close (SF_PRIVATE *psf) ;
static int pvf_write_header (SF_PRIVATE *psf, int calc_length) ;
static int pvf_read_header (SF_PRIVATE *psf) ;
/*------------------------------------------------------------------------------
** Public function.
*/
int
pvf_open (SF_PRIVATE *psf)
{ int subformat ;
int error = 0 ;
if (psf->file.mode == SFM_READ || (psf->file.mode == SFM_RDWR && psf->filelength > 0))
{ if ((error = pvf_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_PVF)
return SFE_BAD_OPEN_FORMAT ;
psf->endian = SF_ENDIAN_BIG ;
if (pvf_write_header (psf, SF_FALSE))
return psf->error ;
psf->write_header = pvf_write_header ;
} ;
psf->container_close = pvf_close ;
psf->blockwidth = psf->bytewidth * psf->sf.channels ;
switch (subformat)
{ case SF_FORMAT_PCM_S8 : /* 8-bit linear PCM. */
case SF_FORMAT_PCM_16 : /* 16-bit linear PCM. */
case SF_FORMAT_PCM_32 : /* 32-bit linear PCM. */
error = pcm_init (psf) ;
break ;
default : break ;
} ;
return error ;
} /* pvf_open */
/*------------------------------------------------------------------------------
*/
static int
pvf_close (SF_PRIVATE * UNUSED (psf))
{
return 0 ;
} /* pvf_close */
static int
pvf_write_header (SF_PRIVATE *psf, int UNUSED (calc_length))
{ sf_count_t current ;
if (psf->pipeoffset > 0)
return 0 ;
current = psf_ftell (psf) ;
/* Reset the current header length to zero. */
psf->header [0] = 0 ;
psf->headindex = 0 ;
if (psf->is_pipe == SF_FALSE)
psf_fseek (psf, 0, SEEK_SET) ;
snprintf ((char*) psf->header, sizeof (psf->header), "PVF1\n%d %d %d\n",
psf->sf.channels, psf->sf.samplerate, psf->bytewidth * 8) ;
psf->headindex = strlen ((char*) psf->header) ;
/* 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 ;
} /* pvf_write_header */
static int
pvf_read_header (SF_PRIVATE *psf)
{ char buffer [32] ;
int marker, channels, samplerate, bitwidth ;
psf_binheader_readf (psf, "pmj", 0, &marker, 1) ;
psf_log_printf (psf, "%M\n", marker) ;
if (marker != PVF1_MARKER)
return SFE_PVF_NO_PVF1 ;
/* Grab characters up until a newline which is replaced by an EOS. */
psf_binheader_readf (psf, "G", buffer, sizeof (buffer)) ;
if (sscanf (buffer, "%d %d %d", &channels, &samplerate, &bitwidth) != 3)
return SFE_PVF_BAD_HEADER ;
psf_log_printf (psf, " Channels : %d\n Sample rate : %d\n Bit width : %d\n",
channels, samplerate, bitwidth) ;
psf->sf.channels = channels ;
psf->sf.samplerate = samplerate ;
switch (bitwidth)
{ case 8 :
psf->sf.format = SF_FORMAT_PVF | SF_FORMAT_PCM_S8 ;
psf->bytewidth = 1 ;
break ;
case 16 :
psf->sf.format = SF_FORMAT_PVF | SF_FORMAT_PCM_16 ;
psf->bytewidth = 2 ;
break ;
case 32 :
psf->sf.format = SF_FORMAT_PVF | SF_FORMAT_PCM_32 ;
psf->bytewidth = 4 ;
break ;
default :
return SFE_PVF_BAD_BITWIDTH ;
} ;
psf->dataoffset = psf_ftell (psf) ;
psf_log_printf (psf, " Data Offset : %D\n", psf->dataoffset) ;
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 ;
} /* pvf_read_header */
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