151 lines
3.9 KiB
C++
151 lines
3.9 KiB
C++
/*
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Copyright (C) 2007 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "pbd/error.h"
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#include "ardour/resampled_source.h"
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#include "pbd/failed_constructor.h"
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#include "pbd/i18n.h"
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using namespace ARDOUR;
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using namespace PBD;
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#ifdef PLATFORM_WINDOWS
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const uint32_t ResampledImportableSource::blocksize = 524288U;
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#else
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const uint32_t ResampledImportableSource::blocksize = 16384U;
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#endif
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ResampledImportableSource::ResampledImportableSource (boost::shared_ptr<ImportableSource> src, framecnt_t rate, SrcQuality srcq)
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: source (src)
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, _src_state (0)
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{
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_src_type = SRC_SINC_BEST_QUALITY;
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switch (srcq) {
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case SrcBest:
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_src_type = SRC_SINC_BEST_QUALITY;
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break;
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case SrcGood:
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_src_type = SRC_SINC_MEDIUM_QUALITY;
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break;
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case SrcQuick:
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_src_type = SRC_SINC_FASTEST;
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break;
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case SrcFast:
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_src_type = SRC_ZERO_ORDER_HOLD;
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break;
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case SrcFastest:
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_src_type = SRC_LINEAR;
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break;
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}
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_input = new float[blocksize];
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seek (0);
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_src_data.src_ratio = ((float) rate) / source->samplerate();
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}
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ResampledImportableSource::~ResampledImportableSource ()
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{
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_src_state = src_delete (_src_state) ;
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delete [] _input;
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}
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framecnt_t
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ResampledImportableSource::read (Sample* output, framecnt_t nframes)
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{
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int err;
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size_t bs = floor ((float)(blocksize / source->channels())) * source->channels();
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/* If the input buffer is empty, refill it. */
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if (_src_data.input_frames == 0) {
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_src_data.input_frames = source->read (_input, bs);
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/* The last read will not be a full buffer, so set end_of_input. */
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if ((size_t) _src_data.input_frames < bs) {
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_end_of_input = true;
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}
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_src_data.input_frames /= source->channels();
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_src_data.data_in = _input;
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}
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_src_data.data_out = output;
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_src_data.output_frames = nframes / source->channels();
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if (_end_of_input && _src_data.input_frames * _src_data.src_ratio <= _src_data.output_frames) {
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/* only set src_data.end_of_input for the last cycle.
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*
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* The flag only affects writing out remaining data in the
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* internal buffer of src_state.
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* SRC is not aware of data bufered here in _src_data.input
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* which needs to be processed first.
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*/
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_src_data.end_of_input = true;
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}
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if ((err = src_process (_src_state, &_src_data))) {
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error << string_compose(_("Import: %1"), src_strerror (err)) << endmsg ;
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return 0 ;
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}
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/* Terminate if at end */
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if (_src_data.end_of_input && _src_data.output_frames_gen == 0) {
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return 0;
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}
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_src_data.data_in += _src_data.input_frames_used * source->channels();
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_src_data.input_frames -= _src_data.input_frames_used ;
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return _src_data.output_frames_gen * source->channels();
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}
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void
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ResampledImportableSource::seek (framepos_t pos)
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{
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source->seek (pos);
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/* and reset things so that we start from scratch with the conversion */
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if (_src_state) {
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src_delete (_src_state);
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}
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int err;
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if ((_src_state = src_new (_src_type, source->channels(), &err)) == 0) {
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error << string_compose(_("Import: src_new() failed : %1"), src_strerror (err)) << endmsg ;
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throw failed_constructor ();
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}
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_src_data.input_frames = 0;
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_src_data.data_in = _input;
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_src_data.end_of_input = 0;
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_end_of_input = false;
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}
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framepos_t
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ResampledImportableSource::natural_position () const
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{
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return source->natural_position() * ratio ();
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}
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