129 lines
3.1 KiB
C++
129 lines
3.1 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 "i18n.h"
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using namespace ARDOUR;
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using namespace PBD;
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const uint32_t ResampledImportableSource::blocksize = 16384U;
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ResampledImportableSource::ResampledImportableSource (boost::shared_ptr<ImportableSource> src, nframes_t rate, SrcQuality srcq)
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: source (src)
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{
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int err;
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source->seek (0);
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/* Initialize the sample rate converter. */
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int 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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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.end_of_input = 0 ; /* Set this later. */
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/* Start with zero to force load in while loop. */
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src_data.input_frames = 0 ;
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src_data.data_in = input ;
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src_data.src_ratio = ((float) rate) / source->samplerate();
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input = new float[blocksize];
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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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nframes_t
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ResampledImportableSource::read (Sample* output, nframes_t nframes)
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{
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int err;
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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, blocksize);
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/* The last read will not be a full buffer, so set end_of_input. */
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if ((nframes_t) src_data.input_frames < blocksize) {
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src_data.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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if (!src_data.end_of_input) {
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src_data.output_frames = nframes / source->channels();
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} else {
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src_data.output_frames = src_data.input_frames;
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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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