interpretor/libsndfile-1.0.25/src/avr.c

   1 /*
   2 ** Copyright (C) 2004-2011 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 <string.h>
  23
  24 #include "sndfile.h"
  25 #include "sfendian.h"
  26 #include "common.h"
  27
  28 #define TWOBIT_MARKER   (MAKE_MARKER ('2', 'B', 'I', 'T'))
  29 #define AVR_HDR_SIZE    128
  30
  31 #define SFE_AVR_X       666
  32
  33 /*
  34 ** From: hyc@hanauma.Jpl.Nasa.Gov (Howard Chu)
  35 **
  36 ** A lot of PD software exists to play Mac .snd files on the ST. One other
  37 ** format that seems pretty popular (used by a number of commercial packages)
  38 ** is the AVR format (from Audio Visual Research). This format has a 128 byte
  39 ** header that looks like this (its actually packed, but thats not portable):
  40 */
  41
  42 typedef struct
  43 {       int             marker ;        /* 2BIT */
  44         char    name [8] ;      /* null-padded sample name */
  45         short   mono ;          /* 0 = mono, 0xffff = stereo */
  46         short   rez ;           /* 8 = 8 bit, 16 = 16 bit */
  47         short   sign ;          /* 0 = unsigned, 0xffff = signed */
  48
  49         short   loop ;          /* 0 = no loop, 0xffff = looping sample */
  50         short   midi ;          /* 0xffff = no MIDI note assigned,  */
  51                                                 /*      0xffXX = single key note assignment */
  52                                                 /*      0xLLHH = key split, low/hi note */
  53         int             srate ;         /* sample frequency in hertz */
  54         int             frames ;        /* sample length in bytes or words (see rez) */
  55         int             lbeg ;          /* offset to start of loop in bytes or words. */
  56                                                 /* set to zero if unused */
  57         int             lend ;          /* offset to end of loop in bytes or words. */
  58                                                 /* set to sample length if unused */
  59         short   res1 ;          /* Reserved, MIDI keyboard split */
  60         short   res2 ;          /* Reserved, sample compression */
  61         short   res3 ;          /* Reserved */
  62         char    ext [20] ;      /* Additional filename space, used if (name[7] != 0) */
  63         char    user [64] ; /* User defined. Typically ASCII message */
  64 } AVR_HEADER ;
  65
  66 /*------------------------------------------------------------------------------
  67 ** Private static functions.
  68 */
  69
  70 static int              avr_close (SF_PRIVATE *psf) ;
  71
  72 static int              avr_read_header (SF_PRIVATE *psf) ;
  73 static int              avr_write_header (SF_PRIVATE *psf, int calc_length) ;
  74
  75 /*------------------------------------------------------------------------------
  76 ** Public function.
  77 */
  78
  79 int
  80 avr_open        (SF_PRIVATE *psf)
  81 {       int             error = 0 ;
  82
  83         if (psf->file.mode == SFM_READ || (psf->file.mode == SFM_RDWR && psf->filelength > 0))
  84         {       if ((error = avr_read_header (psf)))
  85                         return error ;
  86                 } ;
  87
  88         if ((SF_CONTAINER (psf->sf.format)) != SF_FORMAT_AVR)
  89                 return  SFE_BAD_OPEN_FORMAT ;
  90
  91         if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
  92         {       psf->endian = SF_ENDIAN (psf->sf.format) ;
  93                 psf->endian = SF_ENDIAN_BIG ;
  94
  95                 if (avr_write_header (psf, SF_FALSE))
  96                         return psf->error ;
  97
  98                 psf->write_header = avr_write_header ;
  99                 } ;
 100
 101         psf->container_close = avr_close ;
 102
 103         psf->blockwidth = psf->bytewidth * psf->sf.channels ;
 104
 105         error = pcm_init (psf) ;
 106
 107         return error ;
 108 } /* avr_open */
 109
 110 static int
 111 avr_read_header (SF_PRIVATE *psf)
 112 {       AVR_HEADER      hdr ;
 113
 114         memset (&hdr, 0, sizeof (hdr)) ;
 115
 116         psf_binheader_readf (psf, "pmb", 0, &hdr.marker, &hdr.name, sizeof (hdr.name)) ;
 117         psf_log_printf (psf, "%M\n", hdr.marker) ;
 118
 119         if (hdr.marker != TWOBIT_MARKER)
 120                 return SFE_AVR_X ;
 121
 122         psf_log_printf (psf, "  Name        : %s\n", hdr.name) ;
 123
 124         psf_binheader_readf (psf, "E22222", &hdr.mono, &hdr.rez, &hdr.sign, &hdr.loop, &hdr.midi) ;
 125
 126         psf->sf.channels = (hdr.mono & 1) + 1 ;
 127
 128         psf_log_printf (psf, "  Channels    : %d\n  Bit width   : %d\n  Signed      : %s\n",
 129                         (hdr.mono & 1) + 1, hdr.rez, hdr.sign ? "yes" : "no") ;
 130
 131         switch ((hdr.rez << 16) + (hdr.sign & 1))
 132         {       case ((8 << 16) + 0) :
 133                         psf->sf.format = SF_FORMAT_AVR | SF_FORMAT_PCM_U8 ;
 134                         psf->bytewidth = 1 ;
 135                         break ;
 136
 137                 case ((8 << 16) + 1) :
 138                         psf->sf.format = SF_FORMAT_AVR | SF_FORMAT_PCM_S8 ;
 139                         psf->bytewidth = 1 ;
 140                         break ;
 141
 142                 case ((16 << 16) + 1) :
 143                         psf->sf.format = SF_FORMAT_AVR | SF_FORMAT_PCM_16 ;
 144                         psf->bytewidth = 2 ;
 145                         break ;
 146
 147                 default :
 148                         psf_log_printf (psf, "Error : bad rez/sign combination.\n") ;
 149                         return SFE_AVR_X ;
 150                 } ;
 151
 152         psf_binheader_readf (psf, "E4444", &hdr.srate, &hdr.frames, &hdr.lbeg, &hdr.lend) ;
 153
 154         psf->sf.frames = hdr.frames ;
 155         psf->sf.samplerate = hdr.srate ;
 156
 157         psf_log_printf (psf, "  Frames      : %D\n", psf->sf.frames) ;
 158         psf_log_printf (psf, "  Sample rate : %d\n", psf->sf.samplerate) ;
 159
 160         psf_binheader_readf (psf, "E222", &hdr.res1, &hdr.res2, &hdr.res3) ;
 161         psf_binheader_readf (psf, "bb", hdr.ext, sizeof (hdr.ext), hdr.user, sizeof (hdr.user)) ;
 162
 163         psf_log_printf (psf, "  Ext         : %s\n  User        : %s\n", hdr.ext, hdr.user) ;
 164
 165         psf->endian = SF_ENDIAN_BIG ;
 166
 167         psf->dataoffset = AVR_HDR_SIZE ;
 168         psf->datalength = hdr.frames * (hdr.rez / 8) ;
 169
 170         if (psf->fileoffset > 0)
 171                 psf->filelength = AVR_HDR_SIZE + psf->datalength ;
 172
 173         if (psf_ftell (psf) != psf->dataoffset)
 174                 psf_binheader_readf (psf, "j", psf->dataoffset - psf_ftell (psf)) ;
 175
 176         psf->blockwidth = psf->sf.channels * psf->bytewidth ;
 177
 178         if (psf->sf.frames == 0 && psf->blockwidth)
 179                 psf->sf.frames = (psf->filelength - psf->dataoffset) / psf->blockwidth ;
 180
 181         return 0 ;
 182 } /* avr_read_header */
 183
 184 static int
 185 avr_write_header (SF_PRIVATE *psf, int calc_length)
 186 {       sf_count_t      current ;
 187         int                     sign ;
 188
 189         if (psf->pipeoffset > 0)
 190                 return 0 ;
 191
 192         current = psf_ftell (psf) ;
 193
 194         if (calc_length)
 195         {       psf->filelength = psf_get_filelen (psf) ;
 196
 197                 psf->datalength = psf->filelength - psf->dataoffset ;
 198                 if (psf->dataend)
 199                         psf->datalength -= psf->filelength - psf->dataend ;
 200
 201                 psf->sf.frames = psf->datalength / (psf->bytewidth * psf->sf.channels) ;
 202                 } ;
 203
 204         /* Reset the current header length to zero. */
 205         psf->header [0] = 0 ;
 206         psf->headindex = 0 ;
 207
 208         /*
 209         ** Only attempt to seek if we are not writng to a pipe. If we are
 210         ** writing to a pipe we shouldn't be here anyway.
 211         */
 212         if (psf->is_pipe == SF_FALSE)
 213                 psf_fseek (psf, 0, SEEK_SET) ;
 214
 215         psf_binheader_writef (psf, "Emz22", TWOBIT_MARKER, make_size_t (8),
 216                         psf->sf.channels == 2 ? 0xFFFF : 0, psf->bytewidth * 8) ;
 217
 218         sign = ((SF_CODEC (psf->sf.format)) == SF_FORMAT_PCM_U8) ? 0 : 0xFFFF ;
 219
 220         psf_binheader_writef (psf, "E222", sign, 0, 0xFFFF) ;
 221         psf_binheader_writef (psf, "E4444", psf->sf.samplerate, psf->sf.frames, 0, 0) ;
 222
 223         psf_binheader_writef (psf, "E222zz", 0, 0, 0, make_size_t (20), make_size_t (64)) ;
 224
 225         /* Header construction complete so write it out. */
 226         psf_fwrite (psf->header, psf->headindex, 1, psf) ;
 227
 228         if (psf->error)
 229                 return psf->error ;
 230
 231         psf->dataoffset = psf->headindex ;
 232
 233         if (current > 0)
 234                 psf_fseek (psf, current, SEEK_SET) ;
 235
 236         return psf->error ;
 237 } /* avr_write_header */
 238
 239 static int
 240 avr_close (SF_PRIVATE *psf)
 241 {
 242         if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
 243                 avr_write_header (psf, SF_TRUE) ;
 244
 245         return 0 ;
 246 } /* avr_close */
 247