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/***************************************************************************
* Copyright (C) 2008-2014 by Andrzej Rybczak *
* *
* 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 <boost/date_time/posix_time/posix_time.hpp>
#include <boost/math/constants/constants.hpp>
#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"
#include "status.h"
#include "enums.h"
using Global::MainStartY;
using Global::MainHeight;
Visualizer *myVisualizer;
namespace {
const int fps = 25;
// toColor: a scaling function for coloring. For numbers 0 to max this function returns
// a coloring from the lowest color to the highest, and colors will not loop from 0 to max.
const NC::Color &toColor(size_t number, size_t max, bool wrap = true)
{
const auto colors_size = Config.visualizer_colors.size();
const auto index = (number * colors_size) / max;
return Config.visualizer_colors[
wrap ? index % colors_size : std::min(index, colors_size-1)
];
}
}
Visualizer::Visualizer()
: Screen(NC::Window(0, MainStartY, COLS, MainHeight, "", NC::Color::Default, NC::Border()))
{
ResetFD();
m_samples = 44100/fps;
if (Config.visualizer_in_stereo)
m_samples *= 2;
# ifdef HAVE_FFTW3_H
m_fftw_results = m_samples/2+1;
m_freq_magnitudes.resize(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();
m_timer = boost::posix_time::from_time_t(0);
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);
void (Visualizer::*drawStereo)(int16_t *, int16_t *, ssize_t, size_t);
# ifdef HAVE_FFTW3_H
if (Config.visualizer_type == VisualizerType::Spectrum)
{
draw = &Visualizer::DrawFrequencySpectrum;
drawStereo = &Visualizer::DrawFrequencySpectrumStereo;
}
else
# endif // HAVE_FFTW3_H
if (Config.visualizer_type == VisualizerType::WaveFilled)
{
draw = &Visualizer::DrawSoundWaveFill;
drawStereo = &Visualizer::DrawSoundWaveFillStereo;
}
else if (Config.visualizer_type == VisualizerType::Ellipse)
{
draw = &Visualizer::DrawSoundEllipse;
drawStereo = &Visualizer::DrawSoundEllipseStereo;
}
else
{
draw = &Visualizer::DrawSoundWave;
drawStereo = &Visualizer::DrawSoundWaveStereo;
}
const ssize_t samples_read = data/sizeof(int16_t);
if (Config.visualizer_sample_multiplier == 1.0)
{
m_auto_scale_multiplier += 1.0/fps;
std::for_each(buf, buf+samples_read, [this](int16_t &sample) {
double scale = std::numeric_limits<int16_t>::min();
scale /= sample;
scale = fabs(scale);
if (scale < m_auto_scale_multiplier)
m_auto_scale_multiplier = scale;
});
}
std::for_each(buf, buf+samples_read, [this](int16_t &sample) {
int32_t tmp = sample;
if (Config.visualizer_sample_multiplier != 1.0)
tmp *= Config.visualizer_sample_multiplier;
else if (m_auto_scale_multiplier <= 50.0) // limit the auto scale
tmp *= m_auto_scale_multiplier;
if (tmp < std::numeric_limits<int16_t>::min())
sample = std::numeric_limits<int16_t>::min();
else if (tmp > std::numeric_limits<int16_t>::max())
sample = std::numeric_limits<int16_t>::max();
else
sample = tmp;
});
w.clear();
if (Config.visualizer_in_stereo)
{
auto chan_samples = samples_read/2;
int16_t buf_left[chan_samples], buf_right[chan_samples];
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 = w.getHeight()/2;
(this->*drawStereo)(buf_left, buf_right, chan_samples, half_height);
}
else
{
(this->*draw)(buf, samples_read, 0, w.getHeight());
}
w.refresh();
}
int Visualizer::windowTimeout()
{
if (m_fifo >= 0 && Status::State::player() == MPD::psPlay)
return 1000/fps;
else
return Screen<WindowType>::windowTimeout();
}
/**********************************************************************/
void Visualizer::DrawSoundWave(int16_t *buf, ssize_t samples, size_t y_offset, size_t height)
{
const size_t half_height = height/2;
const size_t base_y = y_offset+half_height;
const size_t win_width = w.getWidth();
const int samples_per_column = samples/win_width;
// too little samples
if (samples_per_column == 0)
return;
auto draw_point = [&](size_t x, int32_t y) {
w << NC::XY(x, base_y+y)
<< toColor(std::abs(y), half_height, false)
<< Config.visualizer_chars[0]
<< NC::Color::End;
};
int32_t point_y, prev_point_y = 0;
for (size_t x = 0; x < win_width; ++x)
{
point_y = 0;
// calculate mean from the relevant points
for (int j = 0; j < samples_per_column; ++j)
point_y += buf[x*samples_per_column+j];
point_y /= samples_per_column;
// normalize it to fit the screen
point_y *= height / 65536.0;
draw_point(x, point_y);
// if the gap between two consecutive points is too big,
// intermediate values are needed for the wave to be watchable.
if (x > 0 && std::abs(prev_point_y-point_y) > 1)
{
const int32_t half = (prev_point_y+point_y)/2;
if (prev_point_y < point_y)
{
for (auto y = prev_point_y; y < point_y; ++y)
draw_point(x-(y < half), y);
}
else
{
for (auto y = prev_point_y; y > point_y; --y)
draw_point(x-(y > half), y);
}
}
prev_point_y = point_y;
}
}
void Visualizer::DrawSoundWaveStereo(int16_t *buf_left, int16_t *buf_right, ssize_t samples, size_t height)
{
DrawSoundWave(buf_left, samples, 0, height);
DrawSoundWave(buf_right, samples, height, w.getHeight() - height);
}
/**********************************************************************/
// DrawSoundWaveFill: This visualizer is very similar to DrawSoundWave, but instead of
// a single line the entire height is filled. In stereo mode, the top half of the screen
// is dedicated to the right channel, the bottom the left channel.
void Visualizer::DrawSoundWaveFill(int16_t *buf, ssize_t samples, size_t y_offset, size_t height)
{
// if right channel is drawn, bars descend from the top to the bottom
const bool flipped = y_offset > 0;
const size_t win_width = w.getWidth();
const int samples_per_column = samples/win_width;
// too little samples
if (samples_per_column == 0)
return;
int32_t point_y;
for (size_t x = 0; x < win_width; ++x)
{
point_y = 0;
// calculate mean from the relevant points
for (int j = 0; j < samples_per_column; ++j)
point_y += buf[x*samples_per_column+j];
point_y /= samples_per_column;
// normalize it to fit the screen
point_y = std::abs(point_y);
point_y *= height / 32768.0;
for (int32_t j = 0; j < point_y; ++j)
{
size_t y = flipped ? y_offset+j : y_offset+height-j-1;
w << NC::XY(x, y)
<< toColor(j, height)
<< Config.visualizer_chars[1]
<< NC::Color::End;
}
}
}
void Visualizer::DrawSoundWaveFillStereo(int16_t *buf_left, int16_t *buf_right, ssize_t samples, size_t height)
{
DrawSoundWaveFill(buf_left, samples, 0, height);
DrawSoundWaveFill(buf_right, samples, height, w.getHeight() - height);
}
/**********************************************************************/
// draws the sound wave as an ellipse with origin in the center of the screen
void Visualizer::DrawSoundEllipse(int16_t *buf, ssize_t samples, size_t, size_t height)
{
const size_t half_width = w.getWidth()/2;
const size_t half_height = height/2;
// make it so that the loop goes around the ellipse exactly once
const double deg_multiplier = 2*boost::math::constants::pi<double>()/samples;
int32_t x, y;
double radius, max_radius;
for (ssize_t i = 0; i < samples; ++i)
{
x = half_width * std::cos(i*deg_multiplier);
y = half_height * std::sin(i*deg_multiplier);
max_radius = sqrt(x*x + y*y);
// calculate the distance of the sample from the center,
// where 0 is the center of the ellipse and 1 is its border
radius = std::abs(buf[i]);
radius /= 32768.0;
// appropriately scale the position
x *= radius;
y *= radius;
w << NC::XY(half_width + x, half_height + y)
<< toColor(sqrt(x*x + y*y), max_radius, false)
<< Config.visualizer_chars[0]
<< NC::Color::End;
}
}
// DrawSoundEllipseStereo: This visualizer only works in stereo. The colors form concentric
// rings originating from the center (width/2, height/2). For any given point, the width is
// scaled with the left channel and height is scaled with the right channel. For example,
// if a song is entirely in the right channel, then it would just be a vertical line.
//
// Since every font/terminal is different, the visualizer is never a perfect circle. This
// visualizer assume the font height is twice the length of the font's width. If the font
// is skinner or wider than this, instead of a circle it will be an ellipse.
void Visualizer::DrawSoundEllipseStereo(int16_t *buf_left, int16_t *buf_right, ssize_t samples, size_t half_height)
{
const size_t width = w.getWidth();
const size_t left_half_width = width/2;
const size_t right_half_width = width - left_half_width;
const size_t top_half_height = half_height;
const size_t bottom_half_height = w.getHeight() - half_height;
// Makes the radius of each ring be approximately 2 cells wide.
const int32_t radius = 2*Config.visualizer_colors.size();
int32_t x, y;
for (ssize_t i = 0; i < samples; ++i)
{
x = buf_left[i]/32768.0 * (buf_left[i] < 0 ? left_half_width : right_half_width);
y = buf_right[i]/32768.0 * (buf_right[i] < 0 ? top_half_height : bottom_half_height);
// The arguments to the toColor function roughly follow a circle equation where
// the center is not centered around (0,0). For example (x - w)^2 + (y-h)+2 = r^2
// centers the circle around the point (w,h). Because fonts are not all the same
// size, this will not always generate a perfect circle.
w << toColor(sqrt(x*x + 4*y*y), radius)
<< NC::XY(left_half_width + x, top_half_height + y)
<< Config.visualizer_chars[1]
<< NC::Color::End;
}
}
/**********************************************************************/
#ifdef HAVE_FFTW3_H
void Visualizer::DrawFrequencySpectrum(int16_t *buf, ssize_t samples, size_t y_offset, size_t height)
{
// if right channel is drawn, bars descend from the top to the bottom
const bool flipped = y_offset > 0;
// copy samples to fftw input array
for (unsigned i = 0; i < m_samples; ++i)
m_fftw_input[i] = i < samples ? buf[i] : 0;
fftw_execute(m_fftw_plan);
// count magnitude of each frequency and scale it to fit the screen
for (size_t 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]
)/2e4*height;
const size_t win_width = w.getWidth();
// cut bandwidth a little to achieve better look
const double bins_per_bar = m_fftw_results/win_width * 7/10;
double bar_height;
size_t bar_bound_height;
for (size_t x = 0; x < win_width; ++x)
{
bar_height = 0;
for (int j = 0; j < bins_per_bar; ++j)
bar_height += m_freq_magnitudes[x*bins_per_bar+j];
// buff higher frequencies
bar_height *= log2(2 + x) * 100.0/win_width;
// moderately normalize the heights
bar_height = pow(bar_height, 0.5);
bar_bound_height = std::min(std::size_t(bar_height/bins_per_bar), height);
for (size_t j = 0; j < bar_bound_height; ++j)
{
size_t y = flipped ? y_offset+j : y_offset+height-j-1;
w << NC::XY(x, y)
<< toColor(j, height)
<< Config.visualizer_chars[1]
<< NC::Color::End;
}
}
}
void Visualizer::DrawFrequencySpectrumStereo(int16_t *buf_left, int16_t *buf_right, ssize_t samples, size_t height)
{
DrawFrequencySpectrum(buf_left, samples, 0, height);
DrawFrequencySpectrum(buf_right, samples, height, w.getHeight() - height);
}
#endif // HAVE_FFTW3_H
/**********************************************************************/
void Visualizer::ToggleVisualizationType()
{
switch (Config.visualizer_type)
{
case VisualizerType::Wave:
Config.visualizer_type = VisualizerType::WaveFilled;
break;
case VisualizerType::WaveFilled:
# ifdef HAVE_FFTW3_H
Config.visualizer_type = VisualizerType::Spectrum;
# else
Config.visualizer_type = VisualizerType::Ellipse;
# endif // HAVE_FFTW3_H
break;
# ifdef HAVE_FFTW3_H
case VisualizerType::Spectrum:
Config.visualizer_type = VisualizerType::Ellipse;
break;
# endif // HAVE_FFTW3_H
case VisualizerType::Ellipse:
Config.visualizer_type = VisualizerType::Wave;
break;
}
Statusbar::printf("Visualization type: %1%", Config.visualizer_type);
}
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())
{
for (MPD::OutputIterator out = Mpd.GetOutputs(), end; out != end; ++out)
{
if (out->name() == Config.visualizer_output_name)
{
m_output_id = out->id();
break;
}
}
if (m_output_id == -1)
Statusbar::printf("There is no output named \"%s\"", Config.visualizer_output_name);
}
}
void Visualizer::ResetAutoScaleMultiplier()
{
m_auto_scale_multiplier = std::numeric_limits<double>::infinity();
}
#endif // ENABLE_VISUALIZER
/* vim: set tabstop=4 softtabstop=4 shiftwidth=4 noexpandtab : */