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///////////////////////////////////////////////////////////////////////////////
//
// vlevel_wrapper.cpp - this file is part of vlevel winamp plugin 0.1
// Copyright (C) 2003 Markus Sablatnig
// Copyright (C) 2003 Tom Felker
//
// 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
///////////////////////////////////////////////////////////////////////////////
#include <new>
#include <assert.h>
#include "..\\volumeleveler\\volumeleveler.h"
#include "vlevel_wrapper.h"
CVLWrapper::CVLWrapper():
ms_samples(44100),
ms_channels(2),
mv_strength(.8),
mv_maxMultiplier(25),
mv_length(1),
ms_rate(44100),
mb_samplesOrChannelsChanged(false),
mb_strengthChanged(false),
mb_maxMultiplierChanged(false)
{
mpvl_wrapped = new VolumeLeveler(ms_samples, ms_channels, mv_strength, mv_maxMultiplier);
// I'm surprised this isn't automatic.
if(!mpvl_wrapped)
throw std::bad_alloc();
} // CVLWrapper::CVLWrapper
CVLWrapper::~CVLWrapper()
{
delete mpvl_wrapped;
// TODO: when I cache the buffer allocations, I must delete them here.
}
void CVLWrapper::SetCachedChannels(size_t s_channels)
{
assert(s_channels > 0);
if(ms_channels != s_channels) {
ms_channels = s_channels;
mb_samplesOrChannelsChanged = true;
}
} // CVLWrapper::SetCachedChannels
void CVLWrapper::SetCachedStrength(value_t v_strength)
{
mv_strength = v_strength;
mb_strengthChanged = true;
} // CVLWrapper::SetCachedStrength
void CVLWrapper::SetCachedMaxMultiplier(value_t v_maxMultiplier)
{
mv_maxMultiplier = v_maxMultiplier;
mb_maxMultiplierChanged = true;
} // CVLWrapper::SetCachedMaxMultiplier
void CVLWrapper::SetCachedLength(value_t v_length)
{
mv_length = v_length;
SetCachedSamples(GetCachedLength() * GetCachedRate());
} // CVLWrapper::SetCachedLength
void CVLWrapper::SetCachedRate(size_t s_rate)
{
ms_rate = s_rate;
ms_samples = mv_length * ms_rate;
SetCachedSamples(GetCachedLength() * GetCachedRate());
} // CVLWrapper::SetCachedRate
// Don't call this unless you've just computed s_amples from mv_length and ms_rate.
void CVLWrapper::SetCachedSamples(size_t s_samples)
{
assert(s_samples > 1);
if(ms_samples != s_samples) {
ms_samples = s_samples;
mb_samplesOrChannelsChanged = true;
}
} // CVLWrapper::SetCachedSamples
void CVLWrapper::CacheFlush()
{
if( mb_samplesOrChannelsChanged)
{
mpvl_wrapped->SetSamplesAndChannels(ms_samples, ms_channels);
mb_samplesOrChannelsChanged = false;
} // if
if( mb_strengthChanged )
{
mpvl_wrapped->SetStrength(mv_strength);
mb_strengthChanged = false;
} // if
if(mb_maxMultiplierChanged)
{
mpvl_wrapped->SetMaxMultiplier(mv_maxMultiplier);
SetCachedMaxMultiplier(mpvl_wrapped->GetMaxMultiplier()); // turns negative mms to HUGE_VAL
mb_maxMultiplierChanged = false;
} // if
} // CVLWrapper::CacheFlush
int CVLWrapper::Exchange(void *raw_buf, int samples, int bits_per_value, int channels, int rate)
{
SetCachedChannels(channels);
SetCachedRate(rate);
CacheFlush();
size_t values = samples * channels;
// TODO: cache these allocations for performance.
// This buffer holds interleaved value_t data.
value_t *raw_value_buf = new value_t[values];
// Allocate our per-channel value_t buffers.
// This is the format VolumeLeveler requires.
value_t **bufs = new value_t*[channels];
for(size_t ch = 0; ch < channels; ++ch)
bufs[ch] = new value_t[samples];
// Take data from supplied integer raw_buf to allocated value_t interleaved raw_value_buf.
ToValues((char *)raw_buf, raw_value_buf, values, bits_per_value, true); // true because data is signed.
// De-interleave the data.
for(size_t s = 0; s < samples; ++s)
for(size_t ch = 0; ch < channels; ++ch)
bufs[ch][s] = raw_value_buf[s * channels + ch];
// Perform the effect.
// silence_samples is how many samples at the beginning of the returned buffer
// are silent because the real data hasn't worked through VLevel's buffer yet.
size_t silence_samples = mpvl_wrapped->Exchange(bufs, bufs, samples);
size_t good_samples = samples - silence_samples;
size_t good_values = good_samples * channels;
// Re-interleave the data.
// Visual C++ improperly lets the s defined above persist outside that loop.
// Notice that leading silence_samples are stripped and good data is shifted.
for(/* size_t */ s = 0; s < good_samples; ++s)
for(size_t ch = 0; ch < channels; ++ch)
raw_value_buf[s * channels + ch] = bufs[ch][s + silence_samples];
// Put the good data back into the supplied integer buffer.
FromValues(raw_value_buf, (char *)raw_buf, good_values, bits_per_value, true);
// Deallocate our buffers.
for(/* size_t */ ch = 0; ch < channels; ++ch)
delete [] bufs[ch];
delete [] bufs;
delete [] raw_value_buf;
// Winamp is sloppy about using int when size_t is correct. Oh, well.
// dsp.h says we shouldn't return less than half as many samples as we're given,
// but returning 0 seems to work fine.
return good_samples;
} // CVLWrapper::Exchange
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