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/***************************************************************************
* Copyright (C) 2013 by Ilya Kotov *
* forkotov02@hotmail.ru *
* *
* 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 <QObject>
#include <QIODevice>
#include <qmmp/buffer.h>
#include <qmmp/output.h>
#include <qmmp/fileinfo.h>
#include "decoder_opus.h"
// ic functions for libopusfile
static int opusread (void *src, unsigned char *buf,int size)
{
DecoderOpus *d = (DecoderOpus *) src;
return d->input()->read((char *) buf, size);
}
static int opusseek(void *src, opus_int64 offset, int whence)
{
DecoderOpus *d = (DecoderOpus *) src;
if (d->input()->isSequential())
return -1;
long start = 0;
switch (whence)
{
case SEEK_END:
start = d->input()->size();
break;
case SEEK_CUR:
start = d->input()->pos();
break;
case SEEK_SET:
default:
start = 0;
}
if (d->input()->seek(start + offset))
return 0;
return -1;
}
static opus_int64 opustell(void *src)
{
DecoderOpus *dogg = (DecoderOpus *) src;
return (long) dogg->input()->pos();
}
// Decoder class
DecoderOpus::DecoderOpus(const QString &url, QIODevice *i) : Decoder(i)
{
m_totalTime = 0;
m_opusfile = 0;
m_chan = 0;
m_bitrate = 0;
m_url = url;
}
DecoderOpus::~DecoderOpus()
{
if (m_opusfile)
op_free(m_opusfile);
m_opusfile = 0;
}
bool DecoderOpus::initialize()
{
qDebug("DecoderOpus: initialize");
m_chan = 0;
m_totalTime = 0;
if (!input())
{
qDebug("DecoderOpus: cannot initialize. No input");
return false;
}
if (!input()->isOpen())
{
if (!input()->open(QIODevice::ReadOnly))
{
qWarning("DecoderOpus: unable to open input. Error: %s",qPrintable(input()->errorString()));
return false;
}
}
OpusFileCallbacks opuscb =
{
opusread,
opusseek,
opustell,
0,
};
m_opusfile = op_open_callbacks(this, &opuscb, 0, 0, 0);
if (!m_opusfile)
{
qWarning("DecoderOpus: cannot open stream");
return false;
}
m_bitrate = op_bitrate(m_opusfile, -1) / 1000;
if((m_totalTime = op_pcm_total(m_opusfile, -1) / 48) < 0)
m_totalTime = 0;
const OpusHead *head = op_head(m_opusfile, -1);
if (head)
m_chan = head->channel_count;
configure(48000, m_chan, Qmmp::PCM_S16LE); //opus codec supports 48 kHz only
return true;
}
qint64 DecoderOpus::totalTime()
{
if (!m_opusfile)
return 0;
return m_totalTime;
}
int DecoderOpus::bitrate()
{
return m_bitrate;
}
void DecoderOpus::seek(qint64 time)
{
op_pcm_seek(m_opusfile, time*48);
}
qint64 DecoderOpus::read(char *data, qint64 maxSize)
{
int samples = maxSize / 2 / m_chan;
samples = op_read(m_opusfile, (opus_int16 *)data, samples, 0);
m_bitrate = op_bitrate_instant(m_opusfile) / 1000;
return samples * m_chan * 2;
}
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