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/*
Audio File Library
Copyright (C) 2013 Michael Pruett <michael@68k.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef Lossless_h
#define Lossless_h
#include <audiofile.h>
#include <gtest/gtest.h>
#include <stdint.h>
#include <unistd.h>
#include "TestUtilities.h"
struct NaturalGenerator
{
NaturalGenerator() : m_n(0)
{
}
int32_t operator() () { return ++m_n; }
private:
int32_t m_n;
};
struct LinearCongruentialGenerator
{
LinearCongruentialGenerator() : m_n(0)
{
}
int32_t operator() ()
{
m_n = 1664525 * m_n + 1013904223;
return static_cast<int32_t>(m_n);
}
private:
uint32_t m_n;
};
static inline int32_t trim(int32_t n, int sampleWidth)
{
unsigned shift = (((sampleWidth + 7) >> 3) << 3) - sampleWidth;
unsigned maskShift = 32 - sampleWidth;
n <<= shift;
return (n << maskShift) >> maskShift;
}
template <typename SampleType, typename Generator>
static void testLossless(const char *prefix, int fileFormat,
int compressionFormat, int channelCount, int sampleWidth, int frameCount)
{
SCOPED_TRACE(channelCount);
std::string testFileName;
ASSERT_TRUE(createTemporaryFile(prefix, &testFileName));
AFfilesetup setup = afNewFileSetup();
afInitFileFormat(setup, fileFormat);
afInitChannels(setup, AF_DEFAULT_TRACK, channelCount);
afInitSampleFormat(setup, AF_DEFAULT_TRACK, AF_SAMPFMT_TWOSCOMP, sampleWidth);
afInitCompression(setup, AF_DEFAULT_TRACK, compressionFormat);
AFfilehandle file = afOpenFile(testFileName.c_str(), "w", setup);
ASSERT_TRUE(file);
afFreeFileSetup(setup);
Generator g;
SampleType *data = new SampleType[frameCount * channelCount];
for (int i=0; i<frameCount; i++)
for (int c=0; c<channelCount; c++)
data[i*channelCount + c] = trim(g(), sampleWidth) * ((c&1) ? -1 : 1);
AFframecount framesWritten = afWriteFrames(file, AF_DEFAULT_TRACK, data, frameCount);
ASSERT_EQ(frameCount, framesWritten);
ASSERT_EQ(afCloseFile(file), 0);
file = afOpenFile(testFileName.c_str(), "r", AF_NULL_FILESETUP);
ASSERT_TRUE(file);
ASSERT_EQ(compressionFormat, afGetCompression(file, AF_DEFAULT_TRACK));
int readSampleFormat, readSampleWidth;
afGetSampleFormat(file, AF_DEFAULT_TRACK, &readSampleFormat, &readSampleWidth);
ASSERT_EQ(AF_SAMPFMT_TWOSCOMP, readSampleFormat);
ASSERT_EQ(sampleWidth, readSampleWidth);
ASSERT_EQ(frameCount, afGetFrameCount(file, AF_DEFAULT_TRACK));
SampleType *readData = new SampleType[frameCount * channelCount];
AFframecount framesRead = afReadFrames(file, AF_DEFAULT_TRACK, readData, frameCount);
ASSERT_EQ(frameCount, framesRead);
for (int i=0; i<frameCount; i++)
for (int c=0; c<channelCount; c++)
EXPECT_EQ(data[i*channelCount + c], readData[i*channelCount + c]) <<
"failed at " << i;
// Read entire file with a seek before each read operation.
for (AFframecount offset = 0; offset < frameCount; offset += 373)
{
ASSERT_EQ(offset, afSeekFrame(file, AF_DEFAULT_TRACK, offset));
AFframecount framesToRead = 1091;
framesRead = afReadFrames(file, AF_DEFAULT_TRACK, readData, framesToRead);
ASSERT_EQ(std::min(framesToRead, frameCount - offset), framesRead);
for (int i=0; i<framesRead; i++)
for (int c=0; c<channelCount; c++)
EXPECT_EQ(data[(i+offset)*channelCount + c],
readData[i*channelCount + c]) << "failed at " << i;
}
// Read entire file sequentially in multiple read operations.
ASSERT_EQ(afSeekFrame(file, AF_DEFAULT_TRACK, 0), 0);
AFframecount framesToRead = 1087;
for (AFframecount offset = 0; offset < frameCount; offset += framesToRead)
{
framesRead = afReadFrames(file, AF_DEFAULT_TRACK, readData, framesToRead);
ASSERT_EQ(std::min(framesToRead, frameCount - offset), framesRead);
for (int i=0; i<framesRead; i++)
for (int c=0; c<channelCount; c++)
EXPECT_EQ(data[(i+offset)*channelCount + c],
readData[i*channelCount + c]) << "failed at " << i;
}
ASSERT_EQ(0, afCloseFile(file));
delete [] data;
delete [] readData;
ASSERT_EQ(0, ::unlink(testFileName.c_str()));
}
template <typename SampleType>
static void testLossless(const char *prefix, int fileFormat,
int compressionFormat, int channelCount, int sampleWidth, int frameCount)
{
{
SCOPED_TRACE("Sequential");
testLossless<SampleType, NaturalGenerator>(prefix, fileFormat, compressionFormat, channelCount, sampleWidth, frameCount);
}
{
SCOPED_TRACE("Pseudo-random");
testLossless<SampleType, LinearCongruentialGenerator>(prefix, fileFormat, compressionFormat, channelCount, sampleWidth, frameCount);
}
}
#endif
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