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/***************************************************************************
* Copyright (C) 2008-2014 by Andrzej Rybczak *
* electricityispower@gmail.com *
* *
* 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 St, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#include "visualizer.h"
#ifdef ENABLE_VISUALIZER
#include <cerrno>
#include <cmath>
#include <cstring>
#include <fstream>
#include <limits>
#include <fcntl.h>
#include "global.h"
#include "settings.h"
#include "status.h"
#include "statusbar.h"
#include "title.h"
#include "screen_switcher.h"
using Global::MainStartY;
using Global::MainHeight;
Visualizer *myVisualizer;
const int Visualizer::WindowTimeout = 1000/25; /* 25 fps */
Visualizer::Visualizer()
: Screen(NC::Window(0, MainStartY, COLS, MainHeight, "", Config.visualizer_color, NC::Border::None))
{
ResetFD();
m_samples = Config.visualizer_in_stereo ? 4096 : 2048;
# ifdef HAVE_FFTW3_H
m_fftw_results = m_samples/2+1;
m_freq_magnitudes = new unsigned[m_fftw_results];
m_fftw_input = static_cast<double *>(fftw_malloc(sizeof(double)*m_samples));
m_fftw_output = static_cast<fftw_complex *>(fftw_malloc(sizeof(fftw_complex)*m_fftw_results));
m_fftw_plan = fftw_plan_dft_r2c_1d(m_samples, m_fftw_input, m_fftw_output, FFTW_ESTIMATE);
# endif // HAVE_FFTW3_H
}
void Visualizer::switchTo()
{
SwitchTo::execute(this);
w.clear();
SetFD();
if (m_fifo >= 0)
Global::wFooter->setTimeout(WindowTimeout);
drawHeader();
}
void Visualizer::resize()
{
size_t x_offset, width;
getWindowResizeParams(x_offset, width);
w.resize(width, MainHeight);
w.moveTo(x_offset, MainStartY);
hasToBeResized = 0;
}
std::wstring Visualizer::title()
{
return L"Music visualizer";
}
void Visualizer::update()
{
if (m_fifo < 0)
return;
// PCM in format 44100:16:1 (for mono visualization) and 44100:16:2 (for stereo visualization) is supported
int16_t buf[m_samples];
ssize_t data = read(m_fifo, buf, sizeof(buf));
if (data < 0) // no data available in fifo
return;
if (m_output_id != -1 && Global::Timer - m_timer > Config.visualizer_sync_interval)
{
Mpd.DisableOutput(m_output_id);
usleep(50000);
Mpd.EnableOutput(m_output_id);
m_timer = Global::Timer;
}
void (Visualizer::*draw)(int16_t *, ssize_t, size_t, size_t);
# ifdef HAVE_FFTW3_H
if (!Config.visualizer_use_wave)
draw = &Visualizer::DrawFrequencySpectrum;
else
# endif // HAVE_FFTW3_H
draw = &Visualizer::DrawSoundWave;
w.clear();
ssize_t samples_read = data/sizeof(int16_t);
if (Config.visualizer_in_stereo)
{
int16_t buf_left[samples_read/2], buf_right[samples_read/2];
for (ssize_t i = 0, j = 0; i < samples_read; i += 2, ++j)
{
buf_left[j] = buf[i];
buf_right[j] = buf[i+1];
}
size_t half_height = MainHeight/2;
(this->*draw)(buf_left, samples_read/2, 0, half_height);
(this->*draw)(buf_right, samples_read/2, half_height+(draw == &Visualizer::DrawSoundWave ? 1 : 0), half_height+(draw != &Visualizer::DrawSoundWave ? 1 : 0));
}
else
(this->*draw)(buf, samples_read, 0, MainHeight);
w.refresh();
}
void Visualizer::spacePressed()
{
# ifdef HAVE_FFTW3_H
Config.visualizer_use_wave = !Config.visualizer_use_wave;
Statusbar::printf("Visualization type: %1%",
Config.visualizer_use_wave ? "Sound wave" : "Frequency spectrum"
);
# endif // HAVE_FFTW3_H
}
void Visualizer::DrawSoundWave(int16_t *buf, ssize_t samples, size_t y_offset, size_t height)
{
const int samples_per_col = samples/w.getWidth();
const int half_height = height/2;
double prev_point_pos = 0;
const size_t win_width = w.getWidth();
for (size_t i = 0; i < win_width; ++i)
{
double point_pos = 0;
for (int j = 0; j < samples_per_col; ++j)
point_pos += buf[i*samples_per_col+j];
point_pos /= samples_per_col;
point_pos /= std::numeric_limits<int16_t>::max();
point_pos *= half_height;
w << NC::XY(i, y_offset+half_height+point_pos) << Config.visualizer_chars[0];
if (i && abs(prev_point_pos-point_pos) > 2)
{
// if gap is too big. intermediate values are needed
// since without them all we see are blinking points
const int breakpoint = std::max(prev_point_pos, point_pos);
const int half = (prev_point_pos+point_pos)/2;
for (int k = std::min(prev_point_pos, point_pos)+1; k < breakpoint; k += 2)
w << NC::XY(i-(k < half), y_offset+half_height+k) << Config.visualizer_chars[0];
}
prev_point_pos = point_pos;
}
}
#ifdef HAVE_FFTW3_H
void Visualizer::DrawFrequencySpectrum(int16_t *buf, ssize_t samples, size_t y_offset, size_t height)
{
for (unsigned i = 0, j = 0; i < m_samples; ++i)
{
if (j < samples)
m_fftw_input[i] = buf[j++];
else
m_fftw_input[i] = 0;
}
fftw_execute(m_fftw_plan);
// count magnitude of each frequency and scale it to fit the screen
for (unsigned i = 0; i < m_fftw_results; ++i)
m_freq_magnitudes[i] = sqrt(m_fftw_output[i][0]*m_fftw_output[i][0] + m_fftw_output[i][1]*m_fftw_output[i][1])/1e5*height/5;
const size_t win_width = w.getWidth();
const int freqs_per_col = m_fftw_results/win_width /* cut bandwidth a little to achieve better look */ * 7/10;
for (size_t i = 0; i < win_width; ++i)
{
size_t bar_height = 0;
for (int j = 0; j < freqs_per_col; ++j)
bar_height += m_freq_magnitudes[i*freqs_per_col+j];
bar_height = std::min(bar_height/freqs_per_col, height);
const size_t start_y = y_offset > 0 ? y_offset : height-bar_height;
const size_t stop_y = std::min(bar_height+start_y, w.getHeight());
for (size_t j = start_y; j < stop_y; ++j)
w << NC::XY(i, j) << Config.visualizer_chars[1];
}
}
#endif // HAVE_FFTW3_H
void Visualizer::SetFD()
{
if (m_fifo < 0 && (m_fifo = open(Config.visualizer_fifo_path.c_str(), O_RDONLY | O_NONBLOCK)) < 0)
Statusbar::printf("Couldn't open \"%1%\" for reading PCM data: %2%",
Config.visualizer_fifo_path, strerror(errno)
);
}
void Visualizer::ResetFD()
{
m_fifo = -1;
}
void Visualizer::FindOutputID()
{
m_output_id = -1;
if (!Config.visualizer_output_name.empty())
{
size_t idx = 0;
Mpd.GetOutputs([this, &idx](MPD::Output output) {
if (output.name() == Config.visualizer_output_name)
m_output_id = idx;
++idx;
});
if (m_output_id == -1)
Statusbar::printf("There is no output named \"%s\"", Config.visualizer_output_name);
}
}
#endif // ENABLE_VISUALIZER
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