rearrange icons/presets on xfade editor to be symmetric; refactor importable source/resampled importable source to allow for both sndfile and coreaudio handled file i/o

git-svn-id: svn://localhost/ardour2/branches/2.0-ongoing@3124 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 47 insertions, 0 deletions

diff --git a/libs/ardour/sndfileimportable.cc b/libs/ardour/sndfileimportable.cc
new file mode 100644
index 0000000000..eb0e8a8afb
--- /dev/null
+++ b/libs/ardour/sndfileimportable.cc
@@ -0,0 +1,47 @@
+#include <ardour/sndfileimportable.h>
+#include <sndfile.h>
+
+using namespace ARDOUR;
+using namespace std;
+
+SndFileImportableSource::SndFileImportableSource (const string& path)
+	: in (sf_open (path.c_str(), SFM_READ, &sf_info), sf_close)
+{
+	if (!in) throw failed_constructor();
+}
+
+SndFileImportableSource::~SndFileImportableSource ()
+{
+}
+
+nframes_t
+SndFileImportableSource::read (Sample* buffer, nframes_t nframes) 
+{
+	nframes_t per_channel = nframes / sf_info.channels;
+	per_channel = sf_readf_float (in.get(), buffer, per_channel);
+	return per_channel * sf_info.channels;
+}
+
+uint
+SndFileImportableSource::channels () const 
+{
+	return sf_info.channels;
+}
+
+nframes_t
+SndFileImportableSource::length () const 
+{
+	return sf_info.frames;
+}
+
+nframes_t
+SndFileImportableSource::samplerate() const
+{
+	return sf_info.samplerate;
+}
+
+void
+SndFileImportableSource::seek (nframes_t pos)
+{
+	sf_seek (in.get(), 0, SEEK_SET);
+}