Amarok – versatile and easy to use audio player
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amarok/amarok/src/metadata/mp4/mp4properties.cpp

122 lines
3.4 KiB

/***************************************************************************
copyright : (C) 2005 by Andy Leadbetter
email : andrew.leadbetter@gmail.com
***************************************************************************/
/***************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License version *
* 2.1 as published by the Free Software Foundation. *
* *
* 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 "mp4properties.h"
#include <tstring.h>
#include <config.h>
#ifdef HAVE_SYSTEMS_H
#include <systems.h>
#endif
#include <stdint.h>
#include <cstring>
#include <sys/types.h>
#ifndef UINT64_TO_DOUBLE
#define UINT64_TO_DOUBLE(a) ((double)((int64_t)(a)))
#endif
using namespace TagLib;
////////////////////////////////////////////////////////////////////////////////
// public members
////////////////////////////////////////////////////////////////////////////////
MP4::Properties::Properties(Properties::ReadStyle style) : AudioProperties(style)
{
m_length = 0;
m_bitrate = 0;
m_sampleRate = 0;
m_channels = 0;
}
MP4::Properties::~Properties()
{
}
int MP4::Properties::length() const
{
return m_length;
}
int MP4::Properties::bitrate() const
{
return m_bitrate;
}
int MP4::Properties::sampleRate() const
{
return m_sampleRate;
}
int MP4::Properties::channels() const
{
return m_channels;
}
void MP4::Properties::readMP4Properties( MP4FileHandle mp4File )
{
u_int32_t numTracks = MP4GetNumberOfTracks(mp4File);
for (u_int32_t i = 0; i < numTracks; i++)
{
MP4TrackId trackId = MP4FindTrackId(mp4File, i);
const char* trackType =
MP4GetTrackType(mp4File, trackId);
if (!strcmp(trackType, MP4_AUDIO_TRACK_TYPE))
{
// OK we found an audio track so
// decode it.
readAudioTrackProperties(mp4File, trackId );
}
}
}
void MP4::Properties::readAudioTrackProperties(MP4FileHandle mp4File, MP4TrackId trackId )
{
u_int32_t timeScale =
MP4GetTrackTimeScale(mp4File, trackId);
MP4Duration trackDuration =
MP4GetTrackDuration(mp4File, trackId);
double msDuration =
UINT64_TO_DOUBLE(MP4ConvertFromTrackDuration(mp4File, trackId,
trackDuration, MP4_MSECS_TIME_SCALE));
u_int32_t avgBitRate =
MP4GetTrackBitRate(mp4File, trackId);
m_bitrate = (avgBitRate + 500) / 1000;
m_sampleRate = timeScale;
m_length = (int)(msDuration / 1000.0);
m_channels = 2;
}