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230 lines
7.4 KiB
230 lines
7.4 KiB
/*************************************************************************** |
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* Copyright (C) 2008-2013 by Andrzej Rybczak * |
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* electricityispower@gmail.com * |
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* * |
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* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This program is distributed in the hope that it will be useful, * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* GNU General Public License for more details. * |
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* * |
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* You should have received a copy of the GNU General Public License * |
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* along with this program; if not, write to the * |
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* Free Software Foundation, Inc., * |
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. * |
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***************************************************************************/ |
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#include "visualizer.h" |
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#ifdef ENABLE_VISUALIZER |
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#include <cerrno> |
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#include <cmath> |
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#include <cstring> |
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#include <fstream> |
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#include <limits> |
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#include <fcntl.h> |
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#include <sys/time.h> |
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#include <unistd.h> |
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#include "global.h" |
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#include "settings.h" |
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#include "status.h" |
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#include "statusbar.h" |
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#include "title.h" |
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#include "screen_switcher.h" |
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using Global::MainStartY; |
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using Global::MainHeight; |
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Visualizer *myVisualizer; |
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const int Visualizer::WindowTimeout = 1000/25; /* 25 fps */ |
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Visualizer::Visualizer() |
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: Screen(NC::Window(0, MainStartY, COLS, MainHeight, "", Config.visualizer_color, NC::Border::None)) |
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{ |
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ResetFD(); |
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m_samples = Config.visualizer_in_stereo ? 4096 : 2048; |
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# ifdef HAVE_FFTW3_H |
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m_fftw_results = m_samples/2+1; |
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m_freq_magnitudes = new unsigned[m_fftw_results]; |
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m_fftw_input = static_cast<double *>(fftw_malloc(sizeof(double)*m_samples)); |
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m_fftw_output = static_cast<fftw_complex *>(fftw_malloc(sizeof(fftw_complex)*m_fftw_results)); |
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m_fftw_plan = fftw_plan_dft_r2c_1d(m_samples, m_fftw_input, m_fftw_output, FFTW_ESTIMATE); |
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# endif // HAVE_FFTW3_H |
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} |
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void Visualizer::switchTo() |
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{ |
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SwitchTo::execute(this); |
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w.clear(); |
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SetFD(); |
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m_timer = { 0, 0 }; |
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if (m_fifo >= 0) |
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Global::wFooter->setTimeout(WindowTimeout); |
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drawHeader(); |
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} |
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void Visualizer::resize() |
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{ |
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size_t x_offset, width; |
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getWindowResizeParams(x_offset, width); |
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w.resize(width, MainHeight); |
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w.moveTo(x_offset, MainStartY); |
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hasToBeResized = 0; |
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} |
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std::wstring Visualizer::title() |
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{ |
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return L"Music visualizer"; |
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} |
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void Visualizer::update() |
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{ |
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if (m_fifo < 0) |
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return; |
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// PCM in format 44100:16:1 (for mono visualization) and 44100:16:2 (for stereo visualization) is supported |
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int16_t buf[m_samples]; |
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ssize_t data = read(m_fifo, buf, sizeof(buf)); |
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if (data < 0) // no data available in fifo |
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return; |
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if (m_output_id != -1 && Global::Timer.tv_sec > m_timer.tv_sec+Config.visualizer_sync_interval) |
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{ |
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Mpd.DisableOutput(m_output_id); |
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usleep(50000); |
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Mpd.EnableOutput(m_output_id); |
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m_timer = Global::Timer; |
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} |
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void (Visualizer::*draw)(int16_t *, ssize_t, size_t, size_t); |
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# ifdef HAVE_FFTW3_H |
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if (!Config.visualizer_use_wave) |
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draw = &Visualizer::DrawFrequencySpectrum; |
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else |
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# endif // HAVE_FFTW3_H |
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draw = &Visualizer::DrawSoundWave; |
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w.clear(); |
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ssize_t samples_read = data/sizeof(int16_t); |
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if (Config.visualizer_in_stereo) |
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{ |
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int16_t buf_left[samples_read/2], buf_right[samples_read/2]; |
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for (ssize_t i = 0, j = 0; i < samples_read; i += 2, ++j) |
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{ |
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buf_left[j] = buf[i]; |
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buf_right[j] = buf[i+1]; |
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} |
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size_t half_height = MainHeight/2; |
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(this->*draw)(buf_left, samples_read/2, 0, half_height); |
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(this->*draw)(buf_right, samples_read/2, half_height+(draw == &Visualizer::DrawSoundWave ? 1 : 0), half_height+(draw != &Visualizer::DrawSoundWave ? 1 : 0)); |
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} |
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else |
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(this->*draw)(buf, samples_read, 0, MainHeight); |
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w.refresh(); |
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} |
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void Visualizer::spacePressed() |
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{ |
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# ifdef HAVE_FFTW3_H |
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Config.visualizer_use_wave = !Config.visualizer_use_wave; |
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Statusbar::msg("Visualization type: %s", Config.visualizer_use_wave ? "Sound wave" : "Frequency spectrum"); |
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# endif // HAVE_FFTW3_H |
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} |
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void Visualizer::DrawSoundWave(int16_t *buf, ssize_t samples, size_t y_offset, size_t height) |
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{ |
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const int samples_per_col = samples/w.getWidth(); |
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const int half_height = height/2; |
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double prev_point_pos = 0; |
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const size_t win_width = w.getWidth(); |
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for (size_t i = 0; i < win_width; ++i) |
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{ |
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double point_pos = 0; |
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for (int j = 0; j < samples_per_col; ++j) |
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point_pos += buf[i*samples_per_col+j]; |
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point_pos /= samples_per_col; |
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point_pos /= std::numeric_limits<int16_t>::max(); |
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point_pos *= half_height; |
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w << NC::XY(i, y_offset+half_height+point_pos) << Config.visualizer_chars[0]; |
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if (i && abs(prev_point_pos-point_pos) > 2) |
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{ |
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// if gap is too big. intermediate values are needed |
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// since without them all we see are blinking points |
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const int breakpoint = std::max(prev_point_pos, point_pos); |
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const int half = (prev_point_pos+point_pos)/2; |
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for (int k = std::min(prev_point_pos, point_pos)+1; k < breakpoint; k += 2) |
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w << NC::XY(i-(k < half), y_offset+half_height+k) << Config.visualizer_chars[0]; |
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} |
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prev_point_pos = point_pos; |
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} |
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} |
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#ifdef HAVE_FFTW3_H |
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void Visualizer::DrawFrequencySpectrum(int16_t *buf, ssize_t samples, size_t y_offset, size_t height) |
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{ |
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for (unsigned i = 0, j = 0; i < m_samples; ++i) |
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{ |
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if (j < samples) |
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m_fftw_input[i] = buf[j++]; |
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else |
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m_fftw_input[i] = 0; |
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} |
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fftw_execute(m_fftw_plan); |
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// count magnitude of each frequency and scale it to fit the screen |
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for (unsigned i = 0; i < m_fftw_results; ++i) |
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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; |
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const size_t win_width = w.getWidth(); |
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const int freqs_per_col = m_fftw_results/win_width /* cut bandwidth a little to achieve better look */ * 7/10; |
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for (size_t i = 0; i < win_width; ++i) |
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{ |
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size_t bar_height = 0; |
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for (int j = 0; j < freqs_per_col; ++j) |
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bar_height += m_freq_magnitudes[i*freqs_per_col+j]; |
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bar_height = std::min(bar_height/freqs_per_col, height); |
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const size_t start_y = y_offset > 0 ? y_offset : height-bar_height; |
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const size_t stop_y = std::min(bar_height+start_y, w.getHeight()); |
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for (size_t j = start_y; j < stop_y; ++j) |
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w << NC::XY(i, j) << Config.visualizer_chars[1]; |
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} |
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} |
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#endif // HAVE_FFTW3_H |
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void Visualizer::SetFD() |
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{ |
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if (m_fifo < 0 && (m_fifo = open(Config.visualizer_fifo_path.c_str(), O_RDONLY | O_NONBLOCK)) < 0) |
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Statusbar::msg("Couldn't open \"%s\" for reading PCM data: %s", Config.visualizer_fifo_path.c_str(), strerror(errno)); |
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} |
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void Visualizer::ResetFD() |
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{ |
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m_fifo = -1; |
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} |
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void Visualizer::FindOutputID() |
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{ |
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m_output_id = -1; |
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if (!Config.visualizer_output_name.empty()) |
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{ |
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size_t idx = 0; |
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Mpd.GetOutputs([this, &idx](MPD::Output output) { |
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if (output.name() == Config.visualizer_output_name) |
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m_output_id = idx; |
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++idx; |
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}); |
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if (m_output_id == -1) |
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Statusbar::msg("There is no output named \"%s\"", Config.visualizer_output_name.c_str()); |
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} |
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} |
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#endif // ENABLE_VISUALIZER |
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