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122 lines
3.4 KiB
122 lines
3.4 KiB
/***************************************************************************
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copyright : (C) 2005 by Andy Leadbetter
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email : andrew.leadbetter@gmail.com
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***************************************************************************/
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/***************************************************************************
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* This library is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU Lesser General Public License version *
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* 2.1 as published by the Free Software Foundation. *
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* *
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* This library is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU Lesser General Public *
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* License along with this library; if not, write to the Free Software *
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, *
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* MA 02110-1301 USA *
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***************************************************************************/
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#include "mp4properties.h"
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#include <tstring.h>
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#include <config.h>
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#ifdef HAVE_SYSTEMS_H
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#include <systems.h>
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#endif
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#include <stdint.h>
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#include <cstring>
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#ifndef UINT64_TO_DOUBLE
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#define UINT64_TO_DOUBLE(a) ((double)((int64_t)(a)))
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#endif
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using namespace TagLib;
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////////////////////////////////////////////////////////////////////////////////
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// public members
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////////////////////////////////////////////////////////////////////////////////
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MP4::Properties::Properties(Properties::ReadStyle style) : AudioProperties(style)
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{
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m_length = 0;
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m_bitrate = 0;
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m_sampleRate = 0;
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m_channels = 0;
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}
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MP4::Properties::~Properties()
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{
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}
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int MP4::Properties::length() const
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{
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return m_length;
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}
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int MP4::Properties::bitrate() const
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{
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return m_bitrate;
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}
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int MP4::Properties::sampleRate() const
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{
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return m_sampleRate;
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}
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int MP4::Properties::channels() const
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{
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return m_channels;
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}
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void MP4::Properties::readMP4Properties( MP4FileHandle mp4File )
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{
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u_int32_t numTracks = MP4GetNumberOfTracks(mp4File);
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for (u_int32_t i = 0; i < numTracks; i++)
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{
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MP4TrackId trackId = MP4FindTrackId(mp4File, i);
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const char* trackType =
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MP4GetTrackType(mp4File, trackId);
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if (!strcmp(trackType, MP4_AUDIO_TRACK_TYPE))
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{
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// OK we found an audio track so
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// decode it.
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readAudioTrackProperties(mp4File, trackId );
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}
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}
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}
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void MP4::Properties::readAudioTrackProperties(MP4FileHandle mp4File, MP4TrackId trackId )
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{
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u_int32_t timeScale =
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MP4GetTrackTimeScale(mp4File, trackId);
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MP4Duration trackDuration =
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MP4GetTrackDuration(mp4File, trackId);
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double msDuration =
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UINT64_TO_DOUBLE(MP4ConvertFromTrackDuration(mp4File, trackId,
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trackDuration, MP4_MSECS_TIME_SCALE));
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u_int32_t avgBitRate =
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MP4GetTrackBitRate(mp4File, trackId);
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m_bitrate = (avgBitRate + 500) / 1000;
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m_sampleRate = timeScale;
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m_length = (int)(msDuration / 1000.0);
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m_channels = 2;
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}
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