src/visualizer.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2008-2014 by Andrzej Rybczak                            *
   3  *   electricityispower@gmail.com                                          *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.              *
  19  ***************************************************************************/
  20
  21 #include "visualizer.h"
  22
  23 #ifdef ENABLE_VISUALIZER
  24
  25 #include <cerrno>
  26 #include <cmath>
  27 #include <cstring>
  28 #include <fstream>
  29 #include <limits>
  30 #include <fcntl.h>
  31
  32 #include "global.h"
  33 #include "settings.h"
  34 #include "status.h"
  35 #include "statusbar.h"
  36 #include "title.h"
  37 #include "screen_switcher.h"
  38 #include "status.h"
  39
  40 using Global::MainStartY;
  41 using Global::MainHeight;
  42
  43 Visualizer *myVisualizer;
  44
  45 namespace {
  46
  47 const int fps = 25;
  48
  49 }
  50
  51 Visualizer::Visualizer()
  52 : Screen(NC::Window(0, MainStartY, COLS, MainHeight, "", Config.visualizer_color, NC::Border::None))
  53 {
  54         ResetFD();
  55         m_samples = 44100/fps;
  56         if (Config.visualizer_in_stereo)
  57                 m_samples *= 2;
  58 #       ifdef HAVE_FFTW3_H
  59         m_fftw_results = m_samples/2+1;
  60         m_freq_magnitudes = new double[m_fftw_results];
  61         m_fftw_input = static_cast<double *>(fftw_malloc(sizeof(double)*m_samples));
  62         m_fftw_output = static_cast<fftw_complex *>(fftw_malloc(sizeof(fftw_complex)*m_fftw_results));
  63         m_fftw_plan = fftw_plan_dft_r2c_1d(m_samples, m_fftw_input, m_fftw_output, FFTW_ESTIMATE);
  64 #       endif // HAVE_FFTW3_H
  65 }
  66
  67 void Visualizer::switchTo()
  68 {
  69         SwitchTo::execute(this);
  70         w.clear();
  71         SetFD();
  72         m_timer = boost::posix_time::from_time_t(0);
  73         drawHeader();
  74 }
  75
  76 void Visualizer::resize()
  77 {
  78         size_t x_offset, width;
  79         getWindowResizeParams(x_offset, width);
  80         w.resize(width, MainHeight);
  81         w.moveTo(x_offset, MainStartY);
  82         hasToBeResized = 0;
  83 }
  84
  85 std::wstring Visualizer::title()
  86 {
  87         return L"Music visualizer";
  88 }
  89
  90 void Visualizer::update()
  91 {
  92         if (m_fifo < 0)
  93                 return;
  94
  95         // PCM in format 44100:16:1 (for mono visualization) and 44100:16:2 (for stereo visualization) is supported
  96         int16_t buf[m_samples];
  97         ssize_t data = read(m_fifo, buf, sizeof(buf));
  98         if (data < 0) // no data available in fifo
  99                 return;
 100
 101         if (m_output_id != -1 && Global::Timer - m_timer > Config.visualizer_sync_interval)
 102         {
 103                 Mpd.DisableOutput(m_output_id);
 104                 usleep(50000);
 105                 Mpd.EnableOutput(m_output_id);
 106                 m_timer = Global::Timer;
 107         }
 108
 109         void (Visualizer::*draw)(int16_t *, ssize_t, size_t, size_t);
 110 #       ifdef HAVE_FFTW3_H
 111         if (!Config.visualizer_use_wave)
 112                 draw = &Visualizer::DrawFrequencySpectrum;
 113         else
 114 #       endif // HAVE_FFTW3_H
 115                 draw = &Visualizer::DrawSoundWave;
 116
 117         const ssize_t samples_read = data/sizeof(int16_t);
 118         std::for_each(buf, buf+samples_read, [](int16_t &sample) {
 119                 int32_t tmp = sample * Config.visualizer_sample_multiplier;
 120                 if (tmp < std::numeric_limits<int16_t>::min())
 121                         sample = std::numeric_limits<int16_t>::min();
 122                 else if (tmp > std::numeric_limits<int16_t>::max())
 123                         sample = std::numeric_limits<int16_t>::max();
 124                 else
 125                         sample = tmp;
 126         });
 127
 128         w.clear();
 129         if (Config.visualizer_in_stereo)
 130         {
 131                 int16_t buf_left[samples_read/2], buf_right[samples_read/2];
 132                 for (ssize_t i = 0, j = 0; i < samples_read; i += 2, ++j)
 133                 {
 134                         buf_left[j] = buf[i];
 135                         buf_right[j] = buf[i+1];
 136                 }
 137                 size_t half_height = MainHeight/2;
 138                 (this->*draw)(buf_left, samples_read/2, 0, half_height);
 139                 (this->*draw)(buf_right, samples_read/2, half_height+(draw == &Visualizer::DrawSoundWave ? 1 : 0), half_height+(draw != &Visualizer::DrawSoundWave ? 1 : 0));
 140         }
 141         else
 142                 (this->*draw)(buf, samples_read, 0, MainHeight);
 143         w.refresh();
 144 }
 145
 146 int Visualizer::windowTimeout()
 147 {
 148         if (m_fifo >= 0 && Status::State::player() == MPD::psPlay)
 149                 return 1000/fps;
 150         else
 151                 return Screen<WindowType>::windowTimeout();
 152 }
 153
 154 void Visualizer::spacePressed()
 155 {
 156 #       ifdef HAVE_FFTW3_H
 157         Config.visualizer_use_wave = !Config.visualizer_use_wave;
 158         Statusbar::printf("Visualization type: %1%",
 159                 Config.visualizer_use_wave ? "sound wave" : "frequency spectrum"
 160         );
 161 #       endif // HAVE_FFTW3_H
 162 }
 163
 164 void Visualizer::DrawSoundWave(int16_t *buf, ssize_t samples, size_t y_offset, size_t height)
 165 {
 166         const int samples_per_col = samples/w.getWidth();
 167         const int half_height = height/2;
 168         double prev_point_pos = 0;
 169         const size_t win_width = w.getWidth();
 170         for (size_t i = 0; i < win_width; ++i)
 171         {
 172                 double point_pos = 0;
 173                 for (int j = 0; j < samples_per_col; ++j)
 174                         point_pos += buf[i*samples_per_col+j];
 175                 point_pos /= samples_per_col;
 176                 point_pos /= std::numeric_limits<int16_t>::max();
 177                 point_pos *= half_height;
 178                 w << NC::XY(i, y_offset+half_height+point_pos) << Config.visualizer_chars[0];
 179                 if (i && abs(prev_point_pos-point_pos) > 2)
 180                 {
 181                         // if gap is too big. intermediate values are needed
 182                         // since without them all we see are blinking points
 183                         const int breakpoint = std::max(prev_point_pos, point_pos);
 184                         const int half = (prev_point_pos+point_pos)/2;
 185                         for (int k = std::min(prev_point_pos, point_pos)+1; k < breakpoint; k += 2)
 186                                 w << NC::XY(i-(k < half), y_offset+half_height+k) << Config.visualizer_chars[0];
 187                 }
 188                 prev_point_pos = point_pos;
 189         }
 190 }
 191
 192 #ifdef HAVE_FFTW3_H
 193 void Visualizer::DrawFrequencySpectrum(int16_t *buf, ssize_t samples, size_t y_offset, size_t height)
 194 {
 195         for (unsigned i = 0, j = 0; i < m_samples; ++i)
 196         {
 197                 if (j < samples)
 198                         m_fftw_input[i] = buf[j++];
 199                 else
 200                         m_fftw_input[i] = 0;
 201         }
 202
 203         fftw_execute(m_fftw_plan);
 204
 205         // count magnitude of each frequency and scale it to fit the screen
 206         for (unsigned i = 0; i < m_fftw_results; ++i)
 207                 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;
 208
 209         const size_t win_width = w.getWidth();
 210         // cut bandwidth a little to achieve better look
 211         const int freqs_per_col = m_fftw_results/win_width * 7/10;
 212         double bar_height;
 213         size_t bar_real_height;
 214         for (size_t i = 0; i < win_width; ++i)
 215         {
 216                 bar_height = 0;
 217                 for (int j = 0; j < freqs_per_col; ++j)
 218                         bar_height += m_freq_magnitudes[i*freqs_per_col+j];
 219                 // buff higher frequencies
 220                 bar_height *= log2(2 + i);
 221                 // moderately normalize the heights
 222                 bar_height = pow(bar_height, 0.6);
 223                 bar_real_height = std::min(size_t(bar_height/freqs_per_col), height);
 224                 const size_t start_y = y_offset > 0 ? y_offset : height-bar_real_height;
 225                 const size_t stop_y = std::min(bar_real_height+start_y, w.getHeight());
 226                 for (size_t j = start_y; j < stop_y; ++j)
 227                         w << NC::XY(i, j) << Config.visualizer_chars[1];
 228         }
 229 }
 230 #endif // HAVE_FFTW3_H
 231
 232 void Visualizer::SetFD()
 233 {
 234         if (m_fifo < 0 && (m_fifo = open(Config.visualizer_fifo_path.c_str(), O_RDONLY | O_NONBLOCK)) < 0)
 235                 Statusbar::printf("Couldn't open \"%1%\" for reading PCM data: %2%",
 236                         Config.visualizer_fifo_path, strerror(errno)
 237                 );
 238 }
 239
 240 void Visualizer::ResetFD()
 241 {
 242         m_fifo = -1;
 243 }
 244
 245 void Visualizer::FindOutputID()
 246 {
 247         m_output_id = -1;
 248         if (!Config.visualizer_output_name.empty())
 249         {
 250                 size_t idx = 0;
 251                 Mpd.GetOutputs([this, &idx](MPD::Output output) {
 252                         if (output.name() == Config.visualizer_output_name)
 253                                 m_output_id = idx;
 254                         ++idx;
 255                 });
 256                 if (m_output_id == -1)
 257                         Statusbar::printf("There is no output named \"%s\"", Config.visualizer_output_name);
 258         }
 259 }
 260
 261 #endif // ENABLE_VISUALIZER
 262