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/*! \file
* implementation functions for class qwavheader
*/
# include <string.h> // memmove
# include "qwavheader.hh"
# include "qexception.hh"
# include "qmisc.hh"
# include "endian.hh"
#ifdef NLS
# include <locale.h>
# include <libintl.h>
# define _(s) gettext (s)
#else
# define _(s) (s)
#endif
const u_int32_t qwavheader::HEADERSIZE = sizeof(struct wavheader);
qwavheader::qwavheader (caddr_t p, u_int32_t wavlength) {
header = new wavheader(p);
mappedheader = (struct wavheader *)p;
valid();
if (wavlength)
validLength(wavlength);
}
qwavheader::~qwavheader()
{
delete header;
}
void qwavheader::remap(caddr_t p) {
mappedheader = (struct wavheader *)p;
header->headerCopy(p);
}
u_int32_t qwavheader::setSamples(u_int32_t n) {
// protegir-la d'abusos...
header->datalength = n*header->bytespersample;
header->rifflength = header->datalength+36;
mappedheader->datalength = htolel(header->datalength);
mappedheader->rifflength = htolel(header->rifflength);
#ifdef QVERBOSE
cerr << "sample number set to " << n << endl;
#endif
return getSamples();
}
u_int32_t qwavheader::addSamples(int increment) {
// protegir-la d'abusos...
setSamples(getSamples()+increment);
return getSamples();
}
u_int32_t qwavheader::getSamples() {
return header->datalength / header->bytespersample;
}
bool qwavheader::compatible (const qwavheader &other) {
return (header->channels == other.header->channels) &&
(header->samplerate == other.header->samplerate);
}
bool qwavheader::valid () {
if (!strcmpn(header->riff,"RIFF",4) ||
!strcmpn(header->wave,"WAVE",4) ||
!strcmpn(header->fmt_,"fmt ",4) ||
!strcmpn(header->data,"data",4) ||
(header->fmtlength!=16 ) ||
(header->format!=1 )) {
throw qexception(__PRETTY_FUNCTION__,_("header format error"));
}
if ( (header->channels!=2 && header->channels!=1) ||
(header->samplerate>48000 || header->samplerate<8000) ||
(header->bytespersample!=1 &&
header->bytespersample!=2 &&
header->bytespersample!=4) )
throw qexception(__PRETTY_FUNCTION__,_("header value error"));
// caldria comprovar que bitspersample=bytespersample*channels*8
// caldria comprovar que bytespersec=bytespersample*samplerate
return true;
}
bool qwavheader::validLength (u_int32_t length) {
if ((header->datalength != length-44) || (header->rifflength != length-8))
throw qexception(__PRETTY_FUNCTION__,_("length mismatch"));
return true;
}
u_int32_t qwavheader::getMsDuration() {
return 1000ULL*header->datalength/(header->bytespersample*header->samplerate);
}
u_int32_t qwavheader::getSampleRate() { return header->samplerate; }
u_int32_t qwavheader::getChannels() { return header->channels; }
u_int32_t qwavheader::getOffset (qvf &vf) {
return getSample(vf)*getBytesPerSample()+HEADERSIZE;
}
u_int32_t qwavheader::getOffset (u_int32_t sample) {
// assegurar que sample in (1..getSamples())
return HEADERSIZE+(sample-1)*header->bytespersample;
}
u_int32_t qwavheader::getSample (qvf &vf) {
u_int32_t sample;
switch (vf.getFormat()) {
case qvf::BYTES: sample = vf.getValue()/getBytesPerSample(); break;
case qvf::KBYTES: sample = (vf.getValue()*1024)/getBytesPerSample(); break;
case qvf::MBYTES: sample = (vf.getValue()*1024*1024)/getBytesPerSample(); break;
case qvf::MILLISECONDS: sample = (1ULL*vf.getValue()*getSampleRate())/1000; break;
case qvf::SECONDS: sample = vf.getValue()*getSampleRate(); break;
case qvf::MINUTES: sample = 60*vf.getValue()*getSampleRate(); break;
case qvf::SPECIFIC: sample = vf.getValue(); break;
default:
throw qexception(__PRETTY_FUNCTION__,
string(_("format not recognized: "))+char2string(vf.getFormat()));
}
if (sample<1 || sample>getSamples())
throw qexception(__PRETTY_FUNCTION__,string(_("sample out of range: "))+uint2string(sample));
// i si posssim el qvf, millor
return sample;
}
u_int32_t qwavheader::getBitsPerSample() { return header->bitspersample; }
u_int32_t qwavheader::getBytesPerSample() { return header->bytespersample; }
bool qwavheader::getStereo() { return header->channels==2; }
void qwavheader::wavheader::headerCopy(caddr_t p)
{
memmove(this, p, HEADERSIZE);
#if __BYTE_ORDER != __LITTLE_ENDIAN
rifflength = letohl(rifflength);
fmtlength = letohl(fmtlength);
format = letohs(format);
channels = letohs(channels);
samplerate = letohl(samplerate);
bytespersec = letohl(bytespersec);
bytespersample = letohs(bytespersample);
bitspersample = letohs(bitspersample);
datalength = letohl(datalength);
#endif
}
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