/*
- Copyright (C) 2007 Paul Davis
+ 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
#include "ardour/resampled_source.h"
#include "pbd/failed_constructor.h"
-#include "i18n.h"
+#include "pbd/i18n.h"
using namespace ARDOUR;
using namespace PBD;
+#ifdef PLATFORM_WINDOWS
+const uint32_t ResampledImportableSource::blocksize = 524288U;
+#else
const uint32_t ResampledImportableSource::blocksize = 16384U;
+#endif
-ResampledImportableSource::ResampledImportableSource (boost::shared_ptr<ImportableSource> src, nframes_t rate, SrcQuality srcq)
+ResampledImportableSource::ResampledImportableSource (boost::shared_ptr<ImportableSource> src, framecnt_t rate, SrcQuality srcq)
: source (src)
+ , _src_state (0)
{
- int err;
-
- source->seek (0);
-
- /* Initialize the sample rate converter. */
-
- int src_type = SRC_SINC_BEST_QUALITY;
+ _src_type = SRC_SINC_BEST_QUALITY;
switch (srcq) {
case SrcBest:
- src_type = SRC_SINC_BEST_QUALITY;
+ _src_type = SRC_SINC_BEST_QUALITY;
break;
case SrcGood:
- src_type = SRC_SINC_MEDIUM_QUALITY;
+ _src_type = SRC_SINC_MEDIUM_QUALITY;
break;
case SrcQuick:
- src_type = SRC_SINC_FASTEST;
+ _src_type = SRC_SINC_FASTEST;
break;
case SrcFast:
- src_type = SRC_ZERO_ORDER_HOLD;
+ _src_type = SRC_ZERO_ORDER_HOLD;
break;
case SrcFastest:
- src_type = SRC_LINEAR;
+ _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];
+
+ _input = new float[blocksize];
+
+ seek (0);
+
+ _src_data.src_ratio = ((float) rate) / source->samplerate();
}
ResampledImportableSource::~ResampledImportableSource ()
{
- src_state = src_delete (src_state) ;
- delete [] input;
+ _src_state = src_delete (_src_state) ;
+ delete [] _input;
}
-nframes_t
-ResampledImportableSource::read (Sample* output, nframes_t nframes)
+framecnt_t
+ResampledImportableSource::read (Sample* output, framecnt_t nframes)
{
int err;
+ size_t bs = floor ((float)(blocksize / source->channels())) * source->channels();
/* If the input buffer is empty, refill it. */
-
- if (src_data.input_frames == 0) {
+ if (_src_data.input_frames == 0) {
- src_data.input_frames = source->read (input, blocksize);
+ _src_data.input_frames = source->read (_input, bs);
/* The last read will not be a full buffer, so set end_of_input. */
+ if ((framecnt_t) _src_data.input_frames < bs) {
+ _end_of_input = true;
+ }
- 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;
+ _src_data.input_frames /= source->channels();
+ _src_data.data_in = _input;
+ }
- if (!src_data.end_of_input) {
- src_data.output_frames = nframes / source->channels();
- } else {
- src_data.output_frames = src_data.input_frames;
+ _src_data.data_out = output;
+ _src_data.output_frames = nframes / source->channels();
+
+ if (_end_of_input && _src_data.input_frames * _src_data.src_ratio <= _src_data.output_frames) {
+ /* only set src_data.end_of_input for the last cycle.
+ *
+ * The flag only affects writing out remaining data in the
+ * internal buffer of src_state.
+ * SRC is not aware of data bufered here in _src_data.input
+ * which needs to be processed first.
+ */
+ _src_data.end_of_input = true;
}
- if ((err = src_process (src_state, &src_data))) {
+ 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) {
+ 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();
+ _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();
}
+void
+ResampledImportableSource::seek (framepos_t pos)
+{
+ source->seek (pos);
+
+ /* and reset things so that we start from scratch with the conversion */
+
+ if (_src_state) {
+ src_delete (_src_state);
+ }
+
+ int err;
+
+ 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.input_frames = 0;
+ _src_data.data_in = _input;
+ _src_data.end_of_input = 0;
+ _end_of_input = false;
+}
+
+framepos_t
+ResampledImportableSource::natural_position () const
+{
+ return source->natural_position() * ratio ();
+}
projects / ardour.git / blobdiff