interpretor/libsndfile-1.0.25/src/pvf.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 PVF1_MARKER             (MAKE_MARKER ('P', 'V', 'F', '1'))
  35
  36 /*------------------------------------------------------------------------------
  37 ** Private static functions.
  38 */
  39
  40 static  int             pvf_close               (SF_PRIVATE *psf) ;
  41
  42 static int              pvf_write_header (SF_PRIVATE *psf, int calc_length) ;
  43 static int              pvf_read_header (SF_PRIVATE *psf) ;
  44
  45 /*------------------------------------------------------------------------------
  46 ** Public function.
  47 */
  48
  49 int
  50 pvf_open        (SF_PRIVATE *psf)
  51 {       int             subformat ;
  52         int             error = 0 ;
  53
  54         if (psf->file.mode == SFM_READ || (psf->file.mode == SFM_RDWR && psf->filelength > 0))
  55         {       if ((error = pvf_read_header (psf)))
  56                         return error ;
  57                 } ;
  58
  59         subformat = SF_CODEC (psf->sf.format) ;
  60
  61         if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
  62         {       if ((SF_CONTAINER (psf->sf.format)) != SF_FORMAT_PVF)
  63                         return  SFE_BAD_OPEN_FORMAT ;
  64
  65                 psf->endian = SF_ENDIAN_BIG ;
  66
  67                 if (pvf_write_header (psf, SF_FALSE))
  68                         return psf->error ;
  69
  70                 psf->write_header = pvf_write_header ;
  71                 } ;
  72
  73         psf->container_close = pvf_close ;
  74
  75         psf->blockwidth = psf->bytewidth * psf->sf.channels ;
  76
  77         switch (subformat)
  78         {       case SF_FORMAT_PCM_S8 : /* 8-bit linear PCM. */
  79                 case SF_FORMAT_PCM_16 : /* 16-bit linear PCM. */
  80                 case SF_FORMAT_PCM_32 : /* 32-bit linear PCM. */
  81                                 error = pcm_init (psf) ;
  82                                 break ;
  83
  84                 default :       break ;
  85                 } ;
  86
  87         return error ;
  88 } /* pvf_open */
  89
  90 /*------------------------------------------------------------------------------
  91 */
  92
  93 static int
  94 pvf_close       (SF_PRIVATE * UNUSED (psf))
  95 {
  96         return 0 ;
  97 } /* pvf_close */
  98
  99 static int
 100 pvf_write_header (SF_PRIVATE *psf, int UNUSED (calc_length))
 101 {       sf_count_t      current ;
 102
 103         if (psf->pipeoffset > 0)
 104                 return 0 ;
 105
 106         current = psf_ftell (psf) ;
 107
 108         /* Reset the current header length to zero. */
 109         psf->header [0] = 0 ;
 110         psf->headindex = 0 ;
 111
 112         if (psf->is_pipe == SF_FALSE)
 113                 psf_fseek (psf, 0, SEEK_SET) ;
 114
 115         snprintf ((char*) psf->header, sizeof (psf->header), "PVF1\n%d %d %d\n",
 116                 psf->sf.channels, psf->sf.samplerate, psf->bytewidth * 8) ;
 117
 118         psf->headindex = strlen ((char*) psf->header) ;
 119
 120         /* Header construction complete so write it out. */
 121         psf_fwrite (psf->header, psf->headindex, 1, psf) ;
 122
 123         if (psf->error)
 124                 return psf->error ;
 125
 126         psf->dataoffset = psf->headindex ;
 127
 128         if (current > 0)
 129                 psf_fseek (psf, current, SEEK_SET) ;
 130
 131         return psf->error ;
 132 } /* pvf_write_header */
 133
 134 static int
 135 pvf_read_header (SF_PRIVATE *psf)
 136 {       char    buffer [32] ;
 137         int             marker, channels, samplerate, bitwidth ;
 138
 139         psf_binheader_readf (psf, "pmj", 0, &marker, 1) ;
 140         psf_log_printf (psf, "%M\n", marker) ;
 141
 142         if (marker != PVF1_MARKER)
 143                 return SFE_PVF_NO_PVF1 ;
 144
 145         /* Grab characters up until a newline which is replaced by an EOS. */
 146         psf_binheader_readf (psf, "G", buffer, sizeof (buffer)) ;
 147
 148         if (sscanf (buffer, "%d %d %d", &channels, &samplerate, &bitwidth) != 3)
 149                 return SFE_PVF_BAD_HEADER ;
 150
 151         psf_log_printf (psf, " Channels    : %d\n Sample rate : %d\n Bit width   : %d\n",
 152                                 channels, samplerate, bitwidth) ;
 153
 154         psf->sf.channels = channels ;
 155         psf->sf.samplerate = samplerate ;
 156
 157         switch (bitwidth)
 158         {       case 8 :
 159                                 psf->sf.format = SF_FORMAT_PVF | SF_FORMAT_PCM_S8 ;
 160                                 psf->bytewidth = 1 ;
 161                                 break ;
 162
 163                 case 16 :
 164                                 psf->sf.format = SF_FORMAT_PVF | SF_FORMAT_PCM_16 ;
 165                                 psf->bytewidth = 2 ;
 166                                 break ;
 167                 case 32 :
 168                                 psf->sf.format = SF_FORMAT_PVF | SF_FORMAT_PCM_32 ;
 169                                 psf->bytewidth = 4 ;
 170                                 break ;
 171
 172                 default :
 173                                 return SFE_PVF_BAD_BITWIDTH ;
 174                 } ;
 175
 176         psf->dataoffset = psf_ftell (psf) ;
 177         psf_log_printf (psf, " Data Offset : %D\n", psf->dataoffset) ;
 178
 179         psf->endian = SF_ENDIAN_BIG ;
 180
 181         psf->datalength = psf->filelength - psf->dataoffset ;
 182         psf->blockwidth = psf->sf.channels * psf->bytewidth ;
 183
 184         if (! psf->sf.frames && psf->blockwidth)
 185                 psf->sf.frames = (psf->filelength - psf->dataoffset) / psf->blockwidth ;
 186
 187         return 0 ;
 188 } /* pvf_read_header */