140 lines
3.2 KiB
C++
140 lines
3.2 KiB
C++
/*
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Copyright (C) 2012 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 "ardour/caimportable.h"
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#include <sndfile.h>
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#include "pbd/error.h"
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#include "pbd/i18n.h"
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using namespace ARDOUR;
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using namespace std;
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using namespace PBD;
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CAImportableSource::CAImportableSource (const string& path)
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{
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try {
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af.Open (path.c_str());
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CAStreamBasicDescription file_format (af.GetFileDataFormat());
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CAStreamBasicDescription client_format (file_format);
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/* set canonial form (PCM, native float packed, 32 bit, with the correct number of channels
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and interleaved (since we plan to deinterleave ourselves)
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*/
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client_format.SetCanonical(client_format.NumberChannels(), true);
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af.SetClientFormat (client_format);
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} catch (CAXException& cax) {
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//Don't report an error here since there is one higher up in import.
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//Since libsndfile gets tried second, any failures here may show as
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//invalid errors in the Error log.
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throw failed_constructor ();
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}
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}
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CAImportableSource::~CAImportableSource ()
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{
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}
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samplecnt_t
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CAImportableSource::read (Sample* buffer, samplecnt_t nframes)
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{
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samplecnt_t nread = 0;
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AudioBufferList abl;
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samplecnt_t per_channel;
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bool at_end = false;
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abl.mNumberBuffers = 1;
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abl.mBuffers[0].mNumberChannels = channels();
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per_channel = nframes / abl.mBuffers[0].mNumberChannels;
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while (nread < per_channel) {
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UInt32 new_cnt = per_channel - nread;
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abl.mBuffers[0].mDataByteSize = new_cnt * abl.mBuffers[0].mNumberChannels * sizeof(Sample);
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abl.mBuffers[0].mData = buffer + nread;
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try {
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af.Read (new_cnt, &abl);
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} catch (CAXException& cax) {
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error << string_compose("CAImportable: %1", cax.mOperation);
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return -1;
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}
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if (new_cnt == 0) {
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/* EOF */
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at_end = true;
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break;
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}
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nread += new_cnt;
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}
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if (!at_end && nread < per_channel) {
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return 0;
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} else {
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return nread * abl.mBuffers[0].mNumberChannels;
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}
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}
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uint
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CAImportableSource::channels () const
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{
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return af.GetFileDataFormat().NumberChannels();
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}
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samplecnt_t
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CAImportableSource::length () const
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{
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return af.GetNumberFrames();
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}
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samplecnt_t
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CAImportableSource::samplerate () const
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{
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CAStreamBasicDescription client_asbd;
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try {
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client_asbd = af.GetClientDataFormat ();
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} catch (CAXException& cax) {
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error << string_compose ("CAImportable: %1", cax.mOperation) << endmsg;
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return 0.0;
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}
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return client_asbd.mSampleRate;
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}
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void
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CAImportableSource::seek (samplepos_t pos)
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{
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try {
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af.Seek (pos);
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} catch (CAXException& cax) {
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error << string_compose ("CAImportable: %1 to %2", cax.mOperation, pos) << endmsg;
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}
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}
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