libs/ardour/sndfileimportable.cc

   1 #include "ardour/sndfileimportable.h"
   2 #include <sndfile.h>
   3 #include <iostream>
   4 #include <cstring>
   5
   6 using namespace ARDOUR;
   7 using namespace std;
   8
   9 /* FIXME: this was copied from sndfilesource.cc, at some point these should be merged */
  10 int64_t
  11 SndFileImportableSource::get_timecode_info (SNDFILE* sf, SF_BROADCAST_INFO* binfo, bool& exists)
  12 {
  13         if (sf_command (sf, SFC_GET_BROADCAST_INFO, binfo, sizeof (*binfo)) != SF_TRUE) {
  14                 exists = false;
  15                 return 0;
  16         }
  17
  18         exists = true;
  19         int64_t ret = (uint32_t) binfo->time_reference_high;
  20         ret <<= 32;
  21         ret |= (uint32_t) binfo->time_reference_low;
  22         return ret;
  23 }
  24
  25 SndFileImportableSource::SndFileImportableSource (const string& path)
  26 {
  27         memset(&sf_info, 0 , sizeof(sf_info));
  28         in.reset( sf_open(path.c_str(), SFM_READ, &sf_info), sf_close);
  29         if (!in) throw failed_constructor();
  30
  31         SF_BROADCAST_INFO binfo;
  32         bool timecode_exists;
  33
  34         memset (&binfo, 0, sizeof (binfo));
  35         timecode = get_timecode_info (in.get(), &binfo, timecode_exists);
  36
  37         if (!timecode_exists) {
  38                 timecode = 0;
  39         }
  40 }
  41
  42 SndFileImportableSource::~SndFileImportableSource ()
  43 {
  44 }
  45
  46 framecnt_t
  47 SndFileImportableSource::read (Sample* buffer, framecnt_t nframes)
  48 {
  49         framecnt_t per_channel = nframes / sf_info.channels;
  50         per_channel = sf_readf_float (in.get(), buffer, per_channel);
  51         return per_channel * sf_info.channels;
  52 }
  53
  54 uint
  55 SndFileImportableSource::channels () const
  56 {
  57         return sf_info.channels;
  58 }
  59
  60 framecnt_t
  61 SndFileImportableSource::length () const
  62 {
  63         return (framecnt_t) sf_info.frames;
  64 }
  65
  66 framecnt_t
  67 SndFileImportableSource::samplerate () const
  68 {
  69         return sf_info.samplerate;
  70 }
  71
  72 void
  73 SndFileImportableSource::seek (framepos_t /*pos*/)
  74 {
  75         sf_seek (in.get(), 0, SEEK_SET);
  76 }
  77
  78 framepos_t
  79 SndFileImportableSource::natural_position () const
  80 {
  81         return (framepos_t) timecode;
  82 }
  83
  84 bool
  85 SndFileImportableSource::clamped_at_unity () const
  86 {
  87         int const type = sf_info.format & SF_FORMAT_TYPEMASK;
  88         int const sub = sf_info.format & SF_FORMAT_SUBMASK;
  89         /* XXX: this may not be the full list of formats that are unclamped */
  90         return (sub != SF_FORMAT_FLOAT && sub != SF_FORMAT_DOUBLE && type != SF_FORMAT_OGG);
  91 }