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livetrax/libs/ardour/mp3filesource.cc

79 lines
2.4 KiB
C++

/*
* Copyright (C) 2019 Robin Gareus <robin@gareus.org>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "pbd/error.h"
#include "pbd/compose.h"
#include "ardour/mp3filesource.h"
#include "pbd/i18n.h"
using namespace std;
using namespace ARDOUR;
using namespace PBD;
/** Constructor to be called for existing external-to-session files
* Sources created with this method are never writable or removable.
*/
Mp3FileSource::Mp3FileSource (Session& s, const string& path, int chn, Flag flags)
: Source (s, DataType::AUDIO, path,
Source::Flag (flags & ~(Writable|Removable|RemovableIfEmpty|RemoveAtDestroy)))
, AudioFileSource (s, path,
Source::Flag (flags & ~(Writable|Removable|RemovableIfEmpty|RemoveAtDestroy)))
, _mp3 (path)
, _channel (chn)
{
_length = timecnt_t (_mp3.length ());
if (_channel >= (int) _mp3.channels ()) {
error << string_compose("Mp3FileSource: file only contains %1 channels; %2 is invalid as a channel number (%3)", _mp3.channels (), _channel, name()) << endmsg;
throw failed_constructor();
}
}
Mp3FileSource::~Mp3FileSource ()
{
}
void
Mp3FileSource::close ()
{
}
samplecnt_t
Mp3FileSource::read_unlocked (Sample* dst, samplepos_t start, samplecnt_t cnt) const
{
return _mp3.read_unlocked (dst, start, cnt, _channel);
}
int
Mp3FileSource::get_soundfile_info (string path, SoundFileInfo& _info, string& error_msg)
{
try {
Mp3FileImportableSource mp3 (path);
_info.samplerate = mp3.samplerate ();
_info.channels = mp3.channels ();
_info.length = mp3.length ();
_info.format_name = string_compose (_("MPEG Layer %1 (%2 kbps)"), mp3.layer (), mp3.bitrate ());
_info.timecode = 0;
_info.seekable = false;
return 0;
} catch (...) {}
return -1;
}