rollback to 3428, before the mysterious removal of libs/* at 3431/3432

git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 128 insertions, 0 deletions

diff --git a/libs/ardour/resampled_source.cc b/libs/ardour/resampled_source.cc
new file mode 100644
index 0000000000..083fde95a1
--- /dev/null
+++ b/libs/ardour/resampled_source.cc
@@ -0,0 +1,128 @@
+/*
+    Copyright (C) 2007 Paul Davis 
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include <pbd/error.h>
+#include <ardour/resampled_source.h>
+#include <pbd/failed_constructor.h>
+
+#include "i18n.h"
+
+using namespace ARDOUR;
+using namespace PBD;
+
+const uint32_t ResampledImportableSource::blocksize = 16384U;
+
+ResampledImportableSource::ResampledImportableSource (boost::shared_ptr<ImportableSource> src, nframes_t rate, SrcQuality srcq)
+	: source (src)
+{
+	int err;
+	
+	source->seek (0);
+	
+	/* Initialize the sample rate converter. */
+	
+	int src_type = SRC_LINEAR;
+
+	switch (srcq) {
+	case SrcBest:
+		src_type = SRC_SINC_BEST_QUALITY;
+		break;
+	case SrcGood:
+		src_type = SRC_SINC_MEDIUM_QUALITY;
+		break;
+	case SrcQuick:
+		src_type = SRC_SINC_FASTEST;
+		break;
+	case SrcFast:
+		src_type = SRC_ZERO_ORDER_HOLD;
+		break;
+	case SrcFastest:
+		src_type = SRC_LINEAR;
+		break;
+	}
+	
+	if ((src_state = src_new (src_type, source->channels(), &err)) == 0) {	
+		error << string_compose(_("Import: src_new() failed : %1"), src_strerror (err)) << endmsg ;
+		throw failed_constructor ();
+	}
+	
+	src_data.end_of_input = 0 ; /* Set this later. */
+	
+	/* Start with zero to force load in while loop. */
+	
+	src_data.input_frames = 0 ;
+	src_data.data_in = input ;
+	
+	src_data.src_ratio = ((float) rate) / source->samplerate();
+	
+	input = new float[blocksize];
+}
+
+ResampledImportableSource::~ResampledImportableSource ()
+{
+	src_state = src_delete (src_state) ;
+	delete [] input;
+}
+
+nframes_t 
+ResampledImportableSource::read (Sample* output, nframes_t nframes)
+{
+	int err;
+
+	/* If the input buffer is empty, refill it. */
+	
+	if (src_data.input_frames == 0) {	
+
+		src_data.input_frames = source->read (input, blocksize);
+
+		/* The last read will not be a full buffer, so set end_of_input. */
+
+		if ((nframes_t) src_data.input_frames < blocksize) {
+			src_data.end_of_input = true;
+		}		
+
+		src_data.input_frames /= source->channels();
+		src_data.data_in = input;
+	} 
+	
+	src_data.data_out = output;
+
+	if (!src_data.end_of_input) {
+		src_data.output_frames = nframes / source->channels();
+	} else {
+		src_data.output_frames = src_data.input_frames;
+	}
+
+	if ((err = src_process (src_state, &src_data))) {
+		error << string_compose(_("Import: %1"), src_strerror (err)) << endmsg ;
+		return 0 ;
+	} 
+	
+	/* Terminate if at end */
+	
+	if (src_data.end_of_input && src_data.output_frames_gen == 0) {
+		return 0;
+	}
+	
+	src_data.data_in += src_data.input_frames_used * source->channels();
+	src_data.input_frames -= src_data.input_frames_used ;
+
+	return src_data.output_frames_gen * source->channels();
+}
+