libs/pbd/sndfile_manager.cc

   1 /*
   2     Copyright (C) 2010 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 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 General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <sys/time.h>
  21 #include <sys/resource.h>
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <fcntl.h>
  25 #include <cassert>
  26 #include <iostream>
  27 #include "pbd/compose.h"
  28 #include "pbd/sndfile_manager.h"
  29 #include "pbd/debug.h"
  30
  31 using namespace std;
  32 using namespace PBD;
  33
  34 /** @param n Filename.
  35  *  @param w true to open writeable, otherwise false.
  36  *  @param i SF_INFO for the file.
  37  */
  38
  39 SndFileDescriptor::SndFileDescriptor (string const & n, bool w, SF_INFO* i)
  40         : FileDescriptor (n, w)
  41         , _sndfile (0)
  42         , _info (i)
  43 {
  44         manager()->add (this);
  45 }
  46
  47 SndFileDescriptor::~SndFileDescriptor ()
  48 {
  49         manager()->remove (this);
  50 }
  51
  52 /** @return SNDFILE*, or 0 on error */
  53 SNDFILE*
  54 SndFileDescriptor::allocate ()
  55 {
  56         bool const f = manager()->allocate (this);
  57         if (f) {
  58                 return 0;
  59         }
  60
  61         /* this is ok thread-wise because allocate () has incremented
  62            the Descriptor's refcount, so the file will not be closed
  63         */
  64         return _sndfile;
  65 }
  66
  67 void
  68 SndFileDescriptor::close ()
  69 {
  70         /* we must have a lock on the FileManager's mutex */
  71
  72         sf_close (_sndfile);
  73         _sndfile = 0;
  74 }
  75
  76 bool
  77 SndFileDescriptor::is_open () const
  78 {
  79         /* we must have a lock on the FileManager's mutex */
  80
  81         return _sndfile != 0;
  82 }
  83
  84 bool
  85 SndFileDescriptor::open ()
  86 {
  87         /* we must have a lock on the FileManager's mutex */
  88
  89         _sndfile = sf_open (_name.c_str(), _writeable ? SFM_RDWR : SFM_READ, _info);
  90         return (_sndfile == 0);
  91 }
  92