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// ------------------------------------------------------------------------
// eca-audio-position.cpp: Base class for representing position and length
// of a audio stream.
// Copyright (C) 1999-2002,2007,2008 Kai Vehmanen
//
// Attributes:
// eca-style-version: 3 (see Ecasound Programmer's Guide)
//
// 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// ------------------------------------------------------------------------
#include <cmath>
#include <math.h> /* ceil() */
#include <kvu_dbc.h>
#include "eca-audio-position.h"
ECA_AUDIO_POSITION::ECA_AUDIO_POSITION(void)
{
length_set_rep = false;
position_in_samples_rep = 0;
length_in_samples_rep = 0;
}
ECA_AUDIO_POSITION::~ECA_AUDIO_POSITION(void)
{
}
SAMPLE_SPECS::sample_pos_t ECA_AUDIO_POSITION::length_in_samples(void) const
{
return length_in_samples_rep;
}
int ECA_AUDIO_POSITION::length_in_seconds(void) const
{
DBC_CHECK(samples_per_second() != 0);
return (int)ceil((double)length_in_samples() /
(double)samples_per_second());
}
double ECA_AUDIO_POSITION::length_in_seconds_exact(void) const
{
DBC_CHECK(samples_per_second() != 0);
return (double)length_in_samples() / (double)samples_per_second();
}
void ECA_AUDIO_POSITION::set_length_in_samples(SAMPLE_SPECS::sample_pos_t pos)
{
length_in_samples_rep = pos;
length_set_rep = true;
}
void ECA_AUDIO_POSITION::set_length_in_seconds(int pos_in_seconds)
{
DBC_CHECK(samples_per_second() != 0);
set_length_in_seconds((double)pos_in_seconds);
}
void ECA_AUDIO_POSITION::set_length_in_seconds(double pos_in_seconds)
{
DBC_CHECK(samples_per_second() != 0);
set_length_in_samples(static_cast<SAMPLE_SPECS::sample_pos_t>(pos_in_seconds * samples_per_second()));
}
SAMPLE_SPECS::sample_pos_t ECA_AUDIO_POSITION::position_in_samples(void) const
{
return position_in_samples_rep;
}
int ECA_AUDIO_POSITION::position_in_seconds(void) const
{
DBC_CHECK(samples_per_second() != 0);
return (int)ceil((double)position_in_samples() /
(double)samples_per_second());
}
double ECA_AUDIO_POSITION::position_in_seconds_exact(void) const
{
DBC_CHECK(samples_per_second() != 0);
return (double)position_in_samples() / (double)samples_per_second();
}
void ECA_AUDIO_POSITION::set_position_in_samples(SAMPLE_SPECS::sample_pos_t pos)
{
position_in_samples_rep = pos;
if (position_in_samples_rep < 0) {
position_in_samples_rep = 0;
}
}
void ECA_AUDIO_POSITION::change_position_in_samples(SAMPLE_SPECS::sample_pos_t pos)
{
position_in_samples_rep += pos;
}
void ECA_AUDIO_POSITION::change_position_in_seconds(double pos_in_seconds)
{
DBC_CHECK(samples_per_second() != 0);
change_position_in_samples(static_cast<SAMPLE_SPECS::sample_pos_t>(pos_in_seconds * samples_per_second()));
}
void ECA_AUDIO_POSITION::set_position_in_seconds(int pos_in_seconds)
{
DBC_CHECK(samples_per_second() != 0);
set_position_in_seconds((double)pos_in_seconds);
}
void ECA_AUDIO_POSITION::set_position_in_seconds(double pos_in_seconds)
{
DBC_CHECK(samples_per_second() != 0);
set_position_in_samples(static_cast<SAMPLE_SPECS::sample_pos_t>(pos_in_seconds * samples_per_second()));
}
void ECA_AUDIO_POSITION::seek_first(void)
{
seek_position_in_samples(0);
}
void ECA_AUDIO_POSITION::seek_last(void)
{
seek_position_in_samples(length_in_samples());
}
void ECA_AUDIO_POSITION::seek_position_in_samples(SAMPLE_SPECS::sample_pos_t pos_in_samples)
{
SAMPLE_SPECS::sample_pos_t res =
seek_position(pos_in_samples);
set_position_in_samples(res);
}
void ECA_AUDIO_POSITION::seek_position_in_samples_advance(SAMPLE_SPECS::sample_pos_t pos)
{
seek_position_in_samples(position_in_samples() + pos);
}
void ECA_AUDIO_POSITION::seek_position_in_seconds(double pos_in_seconds)
{
DBC_CHECK(samples_per_second() != 0);
seek_position_in_samples(static_cast<SAMPLE_SPECS::sample_pos_t>(pos_in_seconds * samples_per_second()));
}
void ECA_AUDIO_POSITION::set_samples_per_second(SAMPLE_SPECS::sample_rate_t new_value)
{
double ratio (new_value);
ratio /= samples_per_second();
set_position_in_samples(static_cast<SAMPLE_SPECS::sample_pos_t>(position_in_samples() * ratio));
if (length_set() == true) {
set_length_in_samples(static_cast<SAMPLE_SPECS::sample_pos_t>(length_in_samples() * ratio));
}
ECA_SAMPLERATE_AWARE::set_samples_per_second(new_value);
}
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