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/*
Copyright (C) 2012 Paul Davis
Author: Sakari Bergen
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "audiographer/general/sample_format_converter.h"
#include "audiographer/exception.h"
#include "audiographer/type_utils.h"
#include "private/gdither/gdither.h"
#include <boost/format.hpp>
namespace AudioGrapher
{
template <typename TOut>
SampleFormatConverter<TOut>::SampleFormatConverter (ChannelCount channels) :
channels (channels),
dither (0),
data_out_size (0),
data_out (0),
clip_floats (false)
{
}
template <>
void
SampleFormatConverter<float>::init (samplecnt_t max_samples, int /* type */, int data_width)
{
if (throw_level (ThrowObject) && data_width != 32) {
throw Exception (*this, "Unsupported data width");
}
init_common (max_samples);
dither = gdither_new (GDitherNone, channels, GDitherFloat, data_width);
}
template <>
void
SampleFormatConverter<int32_t>::init (samplecnt_t max_samples, int type, int data_width)
{
if(throw_level (ThrowObject) && data_width > 32) {
throw Exception (*this, "Trying to use SampleFormatConverter<int32_t> with a data width > 32");
}
// GDither is broken with GDither32bit if the dither depth is bigger than 24.
// And since floats only have 24 bits of data, we are fine with this.
data_width = std::min(data_width, 24);
init_common (max_samples);
dither = gdither_new ((GDitherType) type, channels, GDither32bit, data_width);
}
template <>
void
SampleFormatConverter<int16_t>::init (samplecnt_t max_samples, int type, int data_width)
{
if (throw_level (ThrowObject) && data_width > 16) {
throw Exception (*this, boost::str(boost::format
("Data width (%1%) too large for int16_t")
% data_width));
}
init_common (max_samples);
dither = gdither_new ((GDitherType) type, channels, GDither16bit, data_width);
}
template <>
void
SampleFormatConverter<uint8_t>::init (samplecnt_t max_samples, int type, int data_width)
{
if (throw_level (ThrowObject) && data_width > 8) {
throw Exception (*this, boost::str(boost::format
("Data width (%1%) too large for uint8_t")
% data_width));
}
init_common (max_samples);
dither = gdither_new ((GDitherType) type, channels, GDither8bit, data_width);
}
template <typename TOut>
void
SampleFormatConverter<TOut>::init_common (samplecnt_t max_samples)
{
reset();
if (max_samples > data_out_size) {
delete[] data_out;
data_out = new TOut[max_samples];
data_out_size = max_samples;
}
}
template <typename TOut>
SampleFormatConverter<TOut>::~SampleFormatConverter ()
{
reset();
}
template <typename TOut>
void
SampleFormatConverter<TOut>::reset()
{
if (dither) {
gdither_free (dither);
dither = 0;
}
delete[] data_out;
data_out_size = 0;
data_out = 0;
clip_floats = false;
}
/* Basic const version of process() */
template <typename TOut>
void
SampleFormatConverter<TOut>::process (ProcessContext<float> const & c_in)
{
float const * const data = c_in.data();
check_sample_and_channel_count (c_in.samples (), c_in.channels ());
/* Do conversion */
for (uint32_t chn = 0; chn < c_in.channels(); ++chn) {
gdither_runf (dither, chn, c_in.samples_per_channel (), data, data_out);
}
/* Write forward */
ProcessContext<TOut> c_out(c_in, data_out);
this->output (c_out);
}
/* Basic non-const version of process(), calls the const one */
template<typename TOut>
void
SampleFormatConverter<TOut>::process (ProcessContext<float> & c_in)
{
process (static_cast<ProcessContext<float> const &> (c_in));
}
/* template specialization for float, in-place processing (non-const) */
template<>
void
SampleFormatConverter<float>::process (ProcessContext<float> & c_in)
{
samplecnt_t samples = c_in.samples();
float * data = c_in.data();
if (clip_floats) {
for (samplecnt_t x = 0; x < samples; ++x) {
if (data[x] > 1.0f) {
data[x] = 1.0f;
} else if (data[x] < -1.0f) {
data[x] = -1.0f;
}
}
}
output (c_in);
}
/* template specialized const version, copies the data, and calls the non-const version */
template<>
void
SampleFormatConverter<float>::process (ProcessContext<float> const & c_in)
{
// Make copy of data and pass it to non-const version
check_sample_and_channel_count (c_in.samples(), c_in.channels());
TypeUtils<float>::copy (c_in.data(), data_out, c_in.samples());
ProcessContext<float> c (c_in, data_out);
process (c);
}
template<typename TOut>
void
SampleFormatConverter<TOut>::check_sample_and_channel_count (samplecnt_t samples, ChannelCount channels_)
{
if (throw_level (ThrowStrict) && channels_ != channels) {
throw Exception (*this, boost::str (boost::format
("Wrong channel count given to process(), %1% instead of %2%")
% channels_ % channels));
}
if (throw_level (ThrowProcess) && samples > data_out_size) {
throw Exception (*this, boost::str (boost::format
("Too many samples given to process(), %1% instad of %2%")
% samples % data_out_size));
}
}
template class SampleFormatConverter<uint8_t>;
template class SampleFormatConverter<int16_t>;
template class SampleFormatConverter<int32_t>;
template class SampleFormatConverter<float>;
} // namespace
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