interpretor/libsndfile-1.0.25/src/mpc2k.c

   1 /*
   2 ** Copyright (C) 2008-2011 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 **      Info from Olivier Tristan <o.tristan@ultimatesoundbank.com>
  32 **
  33 **      HEADER
  34 **      2 magic bytes: 1 and 4.
  35 **      17 char for the name of the sample.
  36 **      3 bytes: level, tune and channels (0 for channels is mono while 1 is stereo)
  37 **      4 uint32: sampleStart, loopEnd, sampleFrames and loopLength
  38 **      1 byte: loopMode (0 no loop, 1 forward looping)
  39 **      1 byte: number of beat in loop
  40 **      1 uint16: sampleRate
  41 **
  42 **      DATA
  43 **      Data are always non compressed 16 bits interleaved
  44 */
  45
  46 #define HEADER_LENGTH           42      /* Sum of above data fields. */
  47 #define HEADER_NAME_LEN         17      /* Length of name string. */
  48
  49 #define SFE_MPC_NO_MARKER       666
  50
  51 /*------------------------------------------------------------------------------
  52 ** Private static functions.
  53 */
  54
  55 static  int             mpc2k_close             (SF_PRIVATE *psf) ;
  56
  57 static int              mpc2k_write_header (SF_PRIVATE *psf, int calc_length) ;
  58 static int              mpc2k_read_header (SF_PRIVATE *psf) ;
  59
  60 /*------------------------------------------------------------------------------
  61 ** Public function.
  62 */
  63
  64 int
  65 mpc2k_open      (SF_PRIVATE *psf)
  66 {       int             error = 0 ;
  67
  68         if (psf->file.mode == SFM_READ || (psf->file.mode == SFM_RDWR && psf->filelength > 0))
  69         {       if ((error = mpc2k_read_header (psf)))
  70                         return error ;
  71                 } ;
  72
  73         if ((SF_CONTAINER (psf->sf.format)) != SF_FORMAT_MPC2K)
  74                 return  SFE_BAD_OPEN_FORMAT ;
  75
  76         if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
  77         {       if (mpc2k_write_header (psf, SF_FALSE))
  78                         return psf->error ;
  79
  80                 psf->write_header = mpc2k_write_header ;
  81                 } ;
  82
  83         psf->container_close = mpc2k_close ;
  84
  85         psf->blockwidth = psf->bytewidth * psf->sf.channels ;
  86
  87         error = pcm_init (psf) ;
  88
  89         return error ;
  90 } /* mpc2k_open */
  91
  92 /*------------------------------------------------------------------------------
  93 */
  94
  95 static int
  96 mpc2k_close     (SF_PRIVATE *psf)
  97 {
  98         if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
  99                 mpc2k_write_header (psf, SF_TRUE) ;
 100
 101         return 0 ;
 102 } /* mpc2k_close */
 103
 104 static int
 105 mpc2k_write_header (SF_PRIVATE *psf, int calc_length)
 106 {       char sample_name [HEADER_NAME_LEN + 1] ;
 107         sf_count_t      current ;
 108
 109         if (psf->pipeoffset > 0)
 110                 return 0 ;
 111
 112         current = psf_ftell (psf) ;
 113
 114         if (calc_length)
 115         {       psf->filelength = psf_get_filelen (psf) ;
 116
 117                 psf->dataoffset = HEADER_LENGTH ;
 118                 psf->datalength = psf->filelength - psf->dataoffset ;
 119
 120                 psf->sf.frames = psf->datalength / (psf->bytewidth * psf->sf.channels) ;
 121                 } ;
 122
 123         /* Reset the current header length to zero. */
 124         psf->header [0] = 0 ;
 125         psf->headindex = 0 ;
 126
 127         /*
 128         ** Only attempt to seek if we are not writng to a pipe. If we are
 129         ** writing to a pipe we shouldn't be here anyway.
 130         */
 131         if (psf->is_pipe == SF_FALSE)
 132                 psf_fseek (psf, 0, SEEK_SET) ;
 133
 134         snprintf (sample_name, sizeof (sample_name), "%s                    ", psf->file.name.c) ;
 135
 136         psf_binheader_writef (psf, "e11b", 1, 4, sample_name, make_size_t (HEADER_NAME_LEN)) ;
 137         psf_binheader_writef (psf, "e111", 100, 0, (psf->sf.channels - 1) & 1) ;
 138         psf_binheader_writef (psf, "et4888", 0, psf->sf.frames, psf->sf.frames, psf->sf.frames) ;
 139         psf_binheader_writef (psf, "e112", 0, 1, (uint16_t) psf->sf.samplerate) ;
 140
 141         /* Always 16 bit little endian data. */
 142         psf->bytewidth = 2 ;
 143         psf->endian = SF_ENDIAN_LITTLE ;
 144
 145         psf_fwrite (psf->header, psf->headindex, 1, psf) ;
 146
 147         if (psf->error)
 148                 return psf->error ;
 149
 150         psf->dataoffset = psf->headindex ;
 151
 152         if (current > 0)
 153                 psf_fseek (psf, current, SEEK_SET) ;
 154
 155         return psf->error ;
 156 } /* mpc2k_write_header */
 157
 158 static int
 159 mpc2k_read_header (SF_PRIVATE *psf)
 160 {       char sample_name [HEADER_NAME_LEN + 1] ;
 161         unsigned char bytes [4] ;
 162         uint32_t sample_start, loop_end, sample_frames, loop_length ;
 163         uint16_t sample_rate ;
 164
 165         psf_binheader_readf (psf, "pebb", 0, bytes, 2, sample_name, make_size_t (HEADER_NAME_LEN)) ;
 166
 167         if (bytes [0] != 1 || bytes [1] != 4)
 168                 return SFE_MPC_NO_MARKER ;
 169
 170         sample_name [HEADER_NAME_LEN] = 0 ;
 171
 172         psf_log_printf (psf, "MPC2000\n  Name         : %s\n", sample_name) ;
 173
 174         psf_binheader_readf (psf, "eb4444", bytes, 3, &sample_start, &loop_end, &sample_frames, &loop_length) ;
 175
 176         psf->sf.channels = bytes [2] ? 2 : 1 ;
 177
 178         psf_log_printf (psf, "  Level        : %d\n  Tune         : %d\n  Stereo       : %s\n", bytes [0], bytes [1], bytes [2] ? "Yes" : "No") ;
 179
 180         psf_log_printf (psf, "  Sample start : %d\n  Loop end     : %d\n  Frames       : %d\n  Length       : %d\n", sample_start, loop_end, sample_frames, loop_length) ;
 181
 182         psf_binheader_readf (psf, "eb2", bytes, 2, &sample_rate) ;
 183
 184         psf_log_printf (psf, "  Loop mode    : %s\n  Beats        : %d\n  Sample rate  : %d\nEnd\n", bytes [0] ? "None" : "Fwd", bytes [1], sample_rate) ;
 185
 186         psf->sf.samplerate = sample_rate ;
 187
 188         psf->sf.format = SF_FORMAT_MPC2K | SF_FORMAT_PCM_16 ;
 189
 190         psf->dataoffset = psf_ftell (psf) ;
 191
 192         /* Always 16 bit little endian data. */
 193         psf->bytewidth = 2 ;
 194         psf->endian = SF_ENDIAN_LITTLE ;
 195
 196         psf->datalength = psf->filelength - psf->dataoffset ;
 197         psf->blockwidth = psf->sf.channels * psf->bytewidth ;
 198         psf->sf.frames = psf->datalength / psf->blockwidth ;
 199
 200         psf->sf.frames = (psf->filelength - psf->dataoffset) / psf->blockwidth ;
 201
 202         return 0 ;
 203 } /* mpc2k_read_header */
 204