libs/ardour/caimportable.cc

   1 #include "ardour/caimportable.h"
   2 #include <sndfile.h>
   3 #include "pbd/error.h"
   4
   5 #include "i18n.h"
   6
   7 using namespace ARDOUR;
   8 using namespace std;
   9 using namespace PBD;
  10
  11 CAImportableSource::CAImportableSource (const string& path)
  12 {
  13         try {
  14                 af.Open (path.c_str());
  15
  16                 CAStreamBasicDescription file_format (af.GetFileDataFormat());
  17                 CAStreamBasicDescription client_format (file_format);
  18
  19                 /* set canonial form (PCM, native float packed, 32 bit, with the correct number of channels
  20                    and interleaved (since we plan to deinterleave ourselves)
  21                 */
  22
  23                 client_format.SetCanonical(client_format.NumberChannels(), true);
  24                 af.SetClientFormat (client_format);
  25
  26         } catch (CAXException& cax) {
  27                 error << string_compose ("CAImportable: %1", cax.mOperation) << endmsg;
  28                 throw failed_constructor ();
  29         }
  30
  31 }
  32
  33 CAImportableSource::~CAImportableSource ()
  34 {
  35 }
  36
  37 nframes_t
  38 CAImportableSource::read (Sample* buffer, nframes_t nframes)
  39 {
  40         nframes_t nread = 0;
  41         AudioBufferList abl;
  42         nframes_t per_channel;
  43         bool at_end = false;
  44
  45         abl.mNumberBuffers = 1;
  46         abl.mBuffers[0].mNumberChannels = channels();
  47
  48         per_channel = nframes / abl.mBuffers[0].mNumberChannels;
  49
  50         while (nread < per_channel) {
  51
  52                 UInt32 new_cnt = per_channel - nread;
  53
  54                 abl.mBuffers[0].mDataByteSize = new_cnt * abl.mBuffers[0].mNumberChannels * sizeof(Sample);
  55                 abl.mBuffers[0].mData = buffer + nread;
  56
  57                 try {
  58                         af.Read (new_cnt, &abl);
  59                 } catch (CAXException& cax) {
  60                         error << string_compose("CAImportable: %1", cax.mOperation);
  61                         return -1;
  62                 }
  63
  64                 if (new_cnt == 0) {
  65                         /* EOF */
  66                         at_end = true;
  67                         break;
  68                 }
  69
  70                 nread += new_cnt;
  71         }
  72
  73         if (!at_end && nread < per_channel) {
  74                 return 0;
  75         } else {
  76                 return nread * abl.mBuffers[0].mNumberChannels;
  77         }
  78 }
  79
  80 uint
  81 CAImportableSource::channels () const
  82 {
  83         return af.GetFileDataFormat().NumberChannels();
  84 }
  85
  86 nframes_t
  87 CAImportableSource::length () const
  88 {
  89         return af.GetNumberFrames();
  90 }
  91
  92 nframes_t
  93 CAImportableSource::samplerate() const
  94 {
  95         CAStreamBasicDescription client_asbd;
  96
  97         try {
  98                 client_asbd = af.GetClientDataFormat ();
  99         } catch (CAXException& cax) {
 100                 error << string_compose ("CAImportable: %1", cax.mOperation) << endmsg;
 101                 return 0.0;
 102         }
 103
 104         return client_asbd.mSampleRate;
 105 }
 106
 107 void
 108 CAImportableSource::seek (nframes_t pos)
 109 {
 110         try {
 111                 af.Seek (pos);
 112         } catch (CAXException& cax) {
 113                 error << string_compose ("CAImportable: %1 to %2", cax.mOperation, pos) << endmsg;
 114         }
 115 }
 116
 117
 118