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/***************************************************************************
copyright : (C) 2006 by Martin Aumueller
email : [email protected]
copyright : (C) 2005 by Andy Leadbetter
email : [email protected]
(original mp4 implementation)
***************************************************************************/
/***************************************************************************
* 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 <stdio.h>
#include "wavproperties.h"
#include <taglib/tstring.h>
#include "wavfile.h"
#include <netinet/in.h> // ntohl
using namespace TagLib;
struct WavHeader
{
uint32_t riff_id;
uint32_t riff_size;
uint32_t wave_id;
uint32_t format_id;
uint32_t format_size;
uint16_t format_tag;
uint16_t num_channels;
uint32_t num_samples_per_sec;
uint32_t num_avg_bytes_per_sec;
uint16_t num_block_align;
uint16_t bits_per_sample;
uint32_t data_id;
uint32_t num_data_bytes;
};
////////////////////////////////////////////////////////////////////////////////
// public members
////////////////////////////////////////////////////////////////////////////////
Wav::Properties::Properties(Properties::ReadStyle style) : AudioProperties(style)
{
m_length = 0;
m_bitrate = 0;
m_sampleRate = 0;
m_channels = 0;
}
Wav::Properties::~Properties()
{
}
int Wav::Properties::length() const
{
return m_length;
}
int Wav::Properties::bitrate() const
{
return m_bitrate;
}
int Wav::Properties::sampleRate() const
{
return m_sampleRate;
}
int Wav::Properties::channels() const
{
return m_channels;
}
#define swap16(x) ((((x)&0xff00)>>8) | (((x)&0x00ff)<<8))
#define swap32(x) ((swap16((x)&0x0000ffff)<<16) | swap16(((x)&0xffff0000)>>16))
void Wav::Properties::readWavProperties( FILE *fp )
{
fseek(fp, 0, SEEK_SET );
WavHeader header;
if( fread(&header, sizeof(header), 1, fp) != 1 )
{
return;
}
m_channels = ntohs(swap16(header.num_channels));
m_sampleRate = ntohl(swap32(header.num_samples_per_sec));
m_bitrate = ntohl(swap32(header.num_avg_bytes_per_sec)) * 8 / 1000;
m_length = ntohl(swap32(header.num_data_bytes))/ntohl(swap32(header.num_avg_bytes_per_sec));
}
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