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/*
Audio File Library
Copyright (C) 2010, Michael Pruett <michael@68k.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307 USA.
*/
#include "config.h"
#include "AudioFormat.h"
#include "afinternal.h"
#include "byteorder.h"
#include "compression.h"
#include "units.h"
#include "util.h"
#include <assert.h>
#include <stdio.h>
size_t AudioFormat::bytesPerSample(bool stretch3to4) const
{
switch (sampleFormat)
{
case AF_SAMPFMT_FLOAT:
return sizeof (float);
case AF_SAMPFMT_DOUBLE:
return sizeof (double);
default:
{
int size = (sampleWidth + 7) / 8;
if (compressionType == AF_COMPRESSION_NONE &&
size == 3 && stretch3to4)
size = 4;
return size;
}
}
}
size_t AudioFormat::bytesPerFrame(bool stretch3to4) const
{
return bytesPerSample(stretch3to4) * channelCount;
}
size_t AudioFormat::bytesPerSample() const
{
return bytesPerSample(!isPacked());
}
size_t AudioFormat::bytesPerFrame() const
{
return bytesPerFrame(!isPacked());
}
bool AudioFormat::isInteger() const
{
return sampleFormat == AF_SAMPFMT_TWOSCOMP ||
sampleFormat == AF_SAMPFMT_UNSIGNED;
}
bool AudioFormat::isSigned() const
{
return sampleFormat == AF_SAMPFMT_TWOSCOMP;
}
bool AudioFormat::isUnsigned() const
{
return sampleFormat == AF_SAMPFMT_UNSIGNED;
}
bool AudioFormat::isFloat() const
{
return sampleFormat == AF_SAMPFMT_FLOAT ||
sampleFormat == AF_SAMPFMT_DOUBLE;
}
bool AudioFormat::isCompressed() const
{
return compressionType != AF_COMPRESSION_NONE;
}
bool AudioFormat::isUncompressed() const
{
return compressionType == AF_COMPRESSION_NONE;
}
std::string AudioFormat::description() const
{
std::string d;
char s[1024];
/* sampleRate, channelCount */
sprintf(s, "{ %7.2f Hz %d ch ", sampleRate, channelCount);
d += s;
/* sampleFormat, sampleWidth */
switch (sampleFormat)
{
case AF_SAMPFMT_TWOSCOMP:
sprintf(s, "%db 2 ", sampleWidth);
break;
case AF_SAMPFMT_UNSIGNED:
sprintf(s, "%db u ", sampleWidth);
break;
case AF_SAMPFMT_FLOAT:
sprintf(s, "flt ");
break;
case AF_SAMPFMT_DOUBLE:
sprintf(s, "dbl ");
break;
default:
assert(false);
break;
}
d += s;
/* pcm */
sprintf(s, "(%.30g+-%.30g [%.30g,%.30g]) ",
pcm.intercept, pcm.slope,
pcm.minClip, pcm.maxClip);
d += s;
/* byteOrder */
switch (byteOrder)
{
case AF_BYTEORDER_BIGENDIAN:
d += "big ";
break;
case AF_BYTEORDER_LITTLEENDIAN:
d += "little ";
break;
default:
assert(false);
break;
}
if (isCompressed())
{
int compressionIndex = _af_compression_index_from_id(compressionType);
assert(compressionIndex >= 0);
d += "compression: ";
d += _af_compression[compressionIndex].label;
}
return d;
}
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