interpretor/libsndfile-1.0.25/src/wve.c

   1 /*
   2 ** Copyright (C) 2002-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
   3 ** Copyright (C) 2007 Reuben Thomas
   4 **
   5 ** This program is free software; you can redistribute it and/or modify
   6 ** it under the terms of the GNU Lesser General Public License as published by
   7 ** the Free Software Foundation; either version 2.1 of the License, or
   8 ** (at your option) any later version.
   9 **
  10 ** This program is distributed in the hope that it will be useful,
  11 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 ** GNU Lesser General Public License for more details.
  14 **
  15 ** You should have received a copy of the GNU Lesser General Public License
  16 ** along with this program; if not, write to the Free Software
  17 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18 */
  19
  20 #include        "sfconfig.h"
  21
  22 #include        <stdio.h>
  23 #include        <fcntl.h>
  24 #include        <string.h>
  25 #include        <ctype.h>
  26
  27 #include        "sndfile.h"
  28 #include        "sfendian.h"
  29 #include        "common.h"
  30
  31 /*------------------------------------------------------------------------------
  32 ** Macros to handle big/little endian issues, and other magic numbers.
  33 */
  34
  35 #define ALAW_MARKER                     MAKE_MARKER ('A', 'L', 'a', 'w')
  36 #define SOUN_MARKER                     MAKE_MARKER ('S', 'o', 'u', 'n')
  37 #define DFIL_MARKER                     MAKE_MARKER ('d', 'F', 'i', 'l')
  38 #define ESSN_MARKER                     MAKE_MARKER ('e', '*', '*', '\0')
  39 #define PSION_VERSION           ((unsigned short) 3856)
  40 #define PSION_DATAOFFSET        0x20
  41
  42 /*------------------------------------------------------------------------------
  43 ** Private static functions.
  44 */
  45
  46 static int      wve_read_header (SF_PRIVATE *psf) ;
  47 static int      wve_write_header (SF_PRIVATE *psf, int calc_length) ;
  48 static int      wve_close (SF_PRIVATE *psf) ;
  49
  50 /*------------------------------------------------------------------------------
  51 ** Public function.
  52 */
  53
  54 int
  55 wve_open (SF_PRIVATE *psf)
  56 {       int     error = 0 ;
  57
  58         if (psf->is_pipe)
  59                 return SFE_WVE_NO_PIPE ;
  60
  61         if (psf->file.mode == SFM_READ || (psf->file.mode == SFM_RDWR && psf->filelength > 0))
  62         {       if ((error = wve_read_header (psf)))
  63                         return error ;
  64                 } ;
  65
  66         if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
  67         {       if ((SF_CONTAINER (psf->sf.format)) != SF_FORMAT_WVE)
  68                         return  SFE_BAD_OPEN_FORMAT ;
  69
  70                 psf->endian = SF_ENDIAN_BIG ;
  71
  72                 if ((error = wve_write_header (psf, SF_FALSE)))
  73                         return error ;
  74
  75                 psf->write_header = wve_write_header ;
  76                 } ;
  77
  78         psf->blockwidth = psf->bytewidth * psf->sf.channels ;
  79
  80         psf->container_close = wve_close ;
  81
  82         error = alaw_init (psf) ;
  83
  84         return error ;
  85 } /* wve_open */
  86
  87 /*------------------------------------------------------------------------------
  88 */
  89
  90 static int
  91 wve_read_header (SF_PRIVATE *psf)
  92 {       int marker ;
  93         unsigned short version, padding, repeats, trash ;
  94         unsigned datalength ;
  95
  96         /* Set position to start of file to begin reading header. */
  97         psf_binheader_readf (psf, "pm", 0, &marker) ;
  98         if (marker != ALAW_MARKER)
  99         {       psf_log_printf (psf, "Could not find '%M'\n", ALAW_MARKER) ;
 100                 return SFE_WVE_NOT_WVE ;
 101                 } ;
 102
 103         psf_binheader_readf (psf, "m", &marker) ;
 104         if (marker != SOUN_MARKER)
 105         {       psf_log_printf (psf, "Could not find '%M'\n", SOUN_MARKER) ;
 106                 return SFE_WVE_NOT_WVE ;
 107                 } ;
 108
 109         psf_binheader_readf (psf, "m", &marker) ;
 110         if (marker != DFIL_MARKER)
 111         {       psf_log_printf (psf, "Could not find '%M'\n", DFIL_MARKER) ;
 112                 return SFE_WVE_NOT_WVE ;
 113                 } ;
 114
 115         psf_binheader_readf (psf, "m", &marker) ;
 116         if (marker != ESSN_MARKER)
 117         {       psf_log_printf (psf, "Could not find '%M'\n", ESSN_MARKER) ;
 118                 return SFE_WVE_NOT_WVE ;
 119                 } ;
 120
 121         psf_binheader_readf (psf, "E2", &version) ;
 122
 123         psf_log_printf (psf, "Psion Palmtop Alaw (.wve)\n"
 124                         "  Sample Rate : 8000\n"
 125                         "  Channels    : 1\n"
 126                         "  Encoding    : A-law\n") ;
 127
 128         if (version != PSION_VERSION)
 129                 psf_log_printf (psf, "Psion version %d should be %d\n", version, PSION_VERSION) ;
 130
 131         psf_binheader_readf (psf, "E4", &datalength) ;
 132         psf->dataoffset = PSION_DATAOFFSET ;
 133         if (datalength != psf->filelength - psf->dataoffset)
 134         {       psf->datalength = psf->filelength - psf->dataoffset ;
 135                 psf_log_printf (psf, "Data length %d should be %D\n", datalength, psf->datalength) ;
 136                 }
 137         else
 138                 psf->datalength = datalength ;
 139
 140         psf_binheader_readf (psf, "E22222", &padding, &repeats, &trash, &trash, &trash) ;
 141
 142         psf->sf.format          = SF_FORMAT_WVE | SF_FORMAT_ALAW ;
 143         psf->sf.samplerate      = 8000 ;
 144         psf->sf.frames          = psf->datalength ;
 145         psf->sf.channels        = 1 ;
 146
 147         return SFE_NO_ERROR ;
 148 } /* wve_read_header */
 149
 150 /*------------------------------------------------------------------------------
 151 */
 152
 153 static int
 154 wve_write_header (SF_PRIVATE *psf, int calc_length)
 155 {       sf_count_t      current ;
 156         unsigned datalen ;
 157
 158         current = psf_ftell (psf) ;
 159
 160         if (calc_length)
 161         {       psf->filelength = psf_get_filelen (psf) ;
 162
 163                 psf->datalength = psf->filelength - psf->dataoffset ;
 164                 if (psf->dataend)
 165                         psf->datalength -= psf->filelength - psf->dataend ;
 166
 167                 psf->sf.frames = psf->datalength / (psf->bytewidth * psf->sf.channels) ;
 168                 } ;
 169
 170         /* Reset the current header length to zero. */
 171         psf->header [0] = 0 ;
 172         psf->headindex = 0 ;
 173         psf_fseek (psf, 0, SEEK_SET) ;
 174
 175         /* Write header. */
 176         datalen = psf->datalength ;
 177         psf_binheader_writef (psf, "Emmmm", ALAW_MARKER, SOUN_MARKER, DFIL_MARKER, ESSN_MARKER) ;
 178         psf_binheader_writef (psf, "E2422222", PSION_VERSION, datalen, 0, 0, 0, 0, 0) ;
 179         psf_fwrite (psf->header, psf->headindex, 1, psf) ;
 180
 181         if (psf->sf.channels != 1)
 182                 return SFE_CHANNEL_COUNT ;
 183
 184         if (psf->error)
 185                 return psf->error ;
 186
 187         psf->dataoffset = psf->headindex ;
 188
 189         if (current > 0)
 190                 psf_fseek (psf, current, SEEK_SET) ;
 191
 192         return psf->error ;
 193 } /* wve_write_header */
 194
 195 /*------------------------------------------------------------------------------
 196 */
 197
 198 static int
 199 wve_close (SF_PRIVATE *psf)
 200 {
 201         if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
 202         {       /*  Now we know for certain the length of the file we can re-write
 203                 **      the header.
 204                 */
 205                 wve_write_header (psf, SF_TRUE) ;
 206                 } ;
 207
 208         return 0 ;
 209 } /* wve_close */