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/******************************************************************************
* This file is part of the QtOpenAL project
* Copyright (c) 2011 Laszlo Papp <lpapp@kde.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "qalmpg123audiodecoder.h"
#include <QtCore/QFile>
#include <QtCore/QString>
#include <QtCore/QUrl>
#include <QtCore/QDebug>
#include <QtCore/QMutex>
#include <mpg123.h>
class QALMpg123AudioDecoder::Private
{
public:
Private()
: mpg123Handle(0)
{
mutex.lock();
if (++referenceCounter == 1) {
int error;
if ((error = mpg123_init()) == MPG123_OK) {
mutex.unlock();
isValid = true;
} else {
mutex.unlock();
qWarning() << Q_FUNC_INFO << "Failed to initialize the mpg123 library:" << error;
}
}
}
~Private()
{
mutex.lock();
if (--referenceCounter == 0) {
mpg123_exit();
}
mutex.unlock();
}
static sf_count_t fileLengthCallback(void *user_data);
static sf_count_t seekCallback(sf_count_t offset, int whence, void *user_data);
static sf_count_t readCallback(void *ptr, sf_count_t count, void *user_data);
static sf_count_t tellCallback(void *user_data);
static int referenceCounter;
static bool isValid;
QMutex mutex;
QFile file;
QByteArray encodedData;
mpg123_handle *mpg123Handle;
};
bool QALMpg123AudioDecoder::Private::referenceCounter = 0;
bool QALMpg123AudioDecoder::Private::isValid = false;
sf_count_t
QALMpg123AudioDecoder::Private::fileLengthCallback(void *user_data)
{
return reinterpret_cast<QALMpg123AudioDecoder::Private*>(user_data)->file.size();
}
sf_count_t
QALMpg123AudioDecoder::Private::seekCallback(sf_count_t offset, int whence, void *user_data)
{
QFile &tmpFile = reinterpret_cast<QALMpg123AudioDecoder::Private*>(user_data)->file;
switch (whence) {
case SEEK_SET:
if (tmpFile.seek(offset) == true)
return offset;
break;
case SEEK_CUR:
offset += tmpFile.pos();
if (tmpFile.seek(offset) == true)
return offset;
break;
case SEEK_END:
offset += tmpFile.size();
if (tmpFile.seek(offset) == true)
return offset;
break;
default:
qWarning() << Q_FUNC_INFO << "Failed to seek the file:" << tmpFile.fileName() << "Invalid whence value:" << whence;
break;
}
qWarning() << Q_FUNC_INFO << "Failed to seek the file:" << tmpFile.fileName();
return -1;
}
sf_count_t
QALMpg123AudioDecoder::Private::readCallback(void *ptr, sf_count_t count, void *user_data)
{
return reinterpret_cast<QALMpg123AudioDecoder::Private*>(user_data)->file.read(reinterpret_cast<char*>(ptr), count);
}
sf_count_t
QALMpg123AudioDecoder::Private::tellCallback(void *user_data)
{
return reinterpret_cast<QALMpg123AudioDecoder::Private*>(user_data)->file.pos();
}
QALMpg123AudioDecoder::QALMpg123AudioDecoder()
: d(new Private)
{
}
QALMpg123AudioDecoder::~QALMpg123AudioDecoder()
{
}
bool
QALMpg123AudioDecoder::open(const QString &fileName)
{
d->file.setFileName(fileName);
mpg123Handle = mpg123_new(NULL, NULL);
SF_INFO sfInfo;
sfInfo.format = 0;
SF_VIRTUAL_IO sfVirtualIO;
sfVirtualIO.get_filelen = &d->fileLengthCallback;
sfVirtualIO.seek = &d->seekCallback;
sfVirtualIO.read = &d->readCallback;
sfVirtualIO.write = 0;
sfVirtualIO.tell = &d->tellCallback;
if ((d->sndFile = sf_open_virtual(&sfVirtualIO, SFM_READ, &sfInfo, d)) == 0) {
qWarning() << Q_FUNC_INFO << "Failed to open the file" << fileName.toUtf8().constData() << "for decoding:" << sf_strerror(d->sndFile);
return false;
}
d->sfInfo = sfInfo;
return true;
}
qint64
QALMpg123AudioDecoder::pos()
{
int position;
if ((position = sf_seek(d->sndFile, 0, SEEK_CUR)) == -1) {
qWarning() << Q_FUNC_INFO << "Failed to tell the current position:" << sf_strerror(d->sndFile);
}
return position;
}
bool
QALMpg123AudioDecoder::seek(qint64 pos)
{
if (sf_seek(d->sndFile, pos, SEEK_SET) == -1) {
qWarning() << Q_FUNC_INFO << "Failed to seek in the file:" << sf_strerror(d->sndFile);
return false;
}
return true;
}
bool
QALMpg123AudioDecoder::close()
{
mpg123_delete_close(d->mp3Handle);
d->mp3Handle = 0;
return true;
}
void
QALMpg123AudioDecoder::setEncodedData(const QByteArray &encodedData)
{
d->encodedData = encodedData;
}
int
QALMpg123AudioDecoder::channels() const
{
return d->sfInfo.channels;
}
int
QALMpg123AudioDecoder::sampleRate() const
{
return d->sfInfo.samplerate;
}
int
QALMpg123AudioDecoder::sampleSize() const
{
return 16;
}
qint64
QALMpg123AudioDecoder::decode(char *decodedData, qint64 maxlen)
{
return sf_readf_short(d->sndFile, reinterpret_cast<short*>(decodedData), maxlen);
}
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