interpretor/libsndfile-1.0.25/src/broadcast.c

   1 /*
   2 ** Copyright (C) 2006-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
   3 ** Copyright (C) 2006 Paul Davis <paul@linuxaudiosystems.com>
   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 <stddef.h>
  24 #include <string.h>
  25
  26 #include "common.h"
  27
  28
  29 static int gen_coding_history (char * added_history, int added_history_max, const SF_INFO * psfinfo) ;
  30
  31 static inline size_t
  32 bc_min_size (const SF_BROADCAST_INFO* info)
  33 {       if (info == NULL)
  34                 return 0 ;
  35
  36         return offsetof (SF_BROADCAST_INFO, coding_history) + info->coding_history_size ;
  37 } /* bc_min_size */
  38
  39 SF_BROADCAST_INFO_16K*
  40 broadcast_var_alloc (void)
  41 {       return calloc (1, sizeof (SF_BROADCAST_INFO_16K)) ;
  42 } /* broadcast_var_alloc */
  43
  44 int
  45 broadcast_var_set (SF_PRIVATE *psf, const SF_BROADCAST_INFO * info, size_t datasize)
  46 {       size_t len ;
  47
  48         if (info == NULL)
  49                 return SF_FALSE ;
  50
  51         if (bc_min_size (info) > datasize)
  52         {       psf->error = SFE_BAD_BROADCAST_INFO_SIZE ;
  53                 return SF_FALSE ;
  54                 } ;
  55
  56         if (datasize >= sizeof (SF_BROADCAST_INFO_16K))
  57         {       psf->error = SFE_BAD_BROADCAST_INFO_TOO_BIG ;
  58                 return SF_FALSE ;
  59                 } ;
  60
  61         if (psf->broadcast_16k == NULL)
  62         {       if ((psf->broadcast_16k = broadcast_var_alloc ()) == NULL)
  63                 {       psf->error = SFE_MALLOC_FAILED   ;
  64                         return SF_FALSE ;
  65                         } ;
  66                 } ;
  67
  68         memcpy (psf->broadcast_16k, info, offsetof (SF_BROADCAST_INFO, coding_history)) ;
  69
  70         psf_strlcpy_crlf (psf->broadcast_16k->coding_history, info->coding_history, sizeof (psf->broadcast_16k->coding_history), datasize - offsetof (SF_BROADCAST_INFO, coding_history)) ;
  71         len = strlen (psf->broadcast_16k->coding_history) ;
  72
  73         if (len > 0 && psf->broadcast_16k->coding_history [len - 1] != '\n')
  74                 psf_strlcat (psf->broadcast_16k->coding_history, sizeof (psf->broadcast_16k->coding_history), "\r\n") ;
  75
  76         if (psf->file.mode == SFM_WRITE)
  77         {       char added_history [256] ;
  78
  79                 gen_coding_history (added_history, sizeof (added_history), &(psf->sf)) ;
  80                 psf_strlcat (psf->broadcast_16k->coding_history, sizeof (psf->broadcast_16k->coding_history), added_history) ;
  81                 } ;
  82
  83         /* Force coding_history_size to be even. */
  84         len = strlen (psf->broadcast_16k->coding_history) ;
  85         len += (len & 1) ? 1 : 2 ;
  86         psf->broadcast_16k->coding_history_size = len ;
  87
  88         /* Currently writing this version. */
  89         psf->broadcast_16k->version = 1 ;
  90
  91         return SF_TRUE ;
  92 } /* broadcast_var_set */
  93
  94
  95 int
  96 broadcast_var_get (SF_PRIVATE *psf, SF_BROADCAST_INFO * data, size_t datasize)
  97 {       size_t size ;
  98
  99         if (psf->broadcast_16k == NULL)
 100                 return SF_FALSE ;
 101
 102         size = SF_MIN (datasize, bc_min_size ((const SF_BROADCAST_INFO *) psf->broadcast_16k)) ;
 103
 104         memcpy (data, psf->broadcast_16k, size) ;
 105
 106         return SF_TRUE ;
 107 } /* broadcast_var_get */
 108
 109 /*------------------------------------------------------------------------------
 110 */
 111
 112 static int
 113 gen_coding_history (char * added_history, int added_history_max, const SF_INFO * psfinfo)
 114 {       char chnstr [16] ;
 115         int count, width ;
 116
 117         /*
 118         **      From : http://www.sr.se/utveckling/tu/bwf/docs/codhist2.htm
 119         **
 120         **      Parameter            Variable string <allowed option>                 Unit
 121         **      ==========================================================================================
 122         **      Coding Algorithm     A=<ANALOGUE, PCM, MPEG1L1, MPEG1L2, MPEG1L3,
 123         **                           MPEG2L1, MPEG2L2, MPEG2L3>
 124         **      Sampling frequency   F=<11000,22050,24000,32000,44100,48000>          [Hz]
 125         **      Bit-rate             B=<any bit-rate allowed in MPEG 2 (ISO/IEC       [kbit/s per channel]
 126         **                           13818-3)>
 127         **      Word Length          W=<8, 12, 14, 16, 18, 20, 22, 24>                [bits]
 128         **      Mode                 M=<mono, stereo, dual-mono, joint-stereo>
 129         **      Text, free string    T=<a free ASCII-text string for in house use.
 130         **                           This string should contain no commas (ASCII
 131         **                           2Chex). Examples of the contents: ID-No; codec
 132         **                           type; A/D type>
 133         */
 134
 135         switch (psfinfo->channels)
 136         {       case 0 :
 137                         return SF_FALSE ;
 138
 139                 case 1 :
 140                         psf_strlcpy (chnstr, sizeof (chnstr), "mono") ;
 141                         break ;
 142
 143                 case 2 :
 144                         psf_strlcpy (chnstr, sizeof (chnstr), "stereo") ;
 145                         break ;
 146
 147                 default :
 148                         snprintf (chnstr, sizeof (chnstr), "%uchn", psfinfo->channels) ;
 149                         break ;
 150                 } ;
 151
 152         switch (SF_CODEC (psfinfo->format))
 153         {       case SF_FORMAT_PCM_U8 :
 154                 case SF_FORMAT_PCM_S8 :
 155                         width = 8 ;
 156                         break ;
 157                 case SF_FORMAT_PCM_16 :
 158                         width = 16 ;
 159                         break ;
 160                 case SF_FORMAT_PCM_24 :
 161                         width = 24 ;
 162                         break ;
 163                 case SF_FORMAT_PCM_32 :
 164                         width = 32 ;
 165                         break ;
 166                 case SF_FORMAT_FLOAT :
 167                         width = 24 ; /* Bits in the mantissa + 1 */
 168                         break ;
 169                 case SF_FORMAT_DOUBLE :
 170                         width = 53 ; /* Bits in the mantissa + 1 */
 171                         break ;
 172                 case SF_FORMAT_ULAW :
 173                 case SF_FORMAT_ALAW :
 174                         width = 12 ;
 175                         break ;
 176                 default :
 177                         width = 42 ;
 178                         break ;
 179                 } ;
 180
 181         count = snprintf (added_history, added_history_max,
 182                                                         "A=PCM,F=%u,W=%hu,M=%s,T=%s-%s\r\n",
 183                                                         psfinfo->samplerate, width, chnstr, PACKAGE, VERSION) ;
 184
 185         if (count >= added_history_max)
 186                 return 0 ;
 187
 188         return count ;
 189 } /* gen_coding_history */
 190