2 * Copyright (C) 2016 Robin Gareus <robin@gareus.org>
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 #include "audiographer/general/analyser.h"
20 #include "pbd/fastlog.h"
22 using namespace AudioGrapher;
24 Analyser::Analyser (float sample_rate, unsigned int channels, framecnt_t bufsize, framecnt_t n_samples)
26 , _sample_rate (sample_rate)
27 , _channels (channels)
28 , _bufsize (bufsize / channels)
29 , _n_samples (n_samples)
32 assert (bufsize % channels == 0);
33 //printf ("NEW ANALYSER %p r:%.1f c:%d f:%ld l%ld\n", this, sample_rate, channels, bufsize, n_samples);
34 if (channels > 0 && channels <= 2) {
35 using namespace Vamp::HostExt;
36 PluginLoader* loader (PluginLoader::getInstance ());
37 _ebur128_plugin = loader->loadPlugin ("libardourvampplugins:ebur128", sample_rate, PluginLoader::ADAPT_ALL_SAFE);
38 assert (_ebur128_plugin);
39 _ebur128_plugin->reset ();
40 _ebur128_plugin->initialise (channels, _bufsize, _bufsize);
42 _bufs[0] = (float*) malloc (sizeof (float) * _bufsize);
43 _bufs[1] = (float*) malloc (sizeof (float) * _bufsize);
45 const size_t peaks = sizeof (_result.peaks) / sizeof (ARDOUR::PeakData::PeakDatum) / 4;
46 _spp = ceil ((_n_samples + 1.f) / (float) peaks);
48 const size_t swh = sizeof (_result.spectrum) / sizeof (float);
49 const size_t height = sizeof (_result.spectrum[0]) / sizeof (float);
50 const size_t width = swh / height;
51 _fpp = ceil ((_n_samples + 1.f) / (float) width);
53 _fft_data_size = _bufsize / 2;
54 _fft_freq_per_bin = sample_rate / _fft_data_size / 2.f;
56 _fft_data_in = (float *) fftwf_malloc (sizeof (float) * _bufsize);
57 _fft_data_out = (float *) fftwf_malloc (sizeof (float) * _bufsize);
58 _fft_power = (float *) malloc (sizeof (float) * _fft_data_size);
60 for (uint32_t i = 0; i < _fft_data_size; ++i) {
63 for (uint32_t i = 0; i < _bufsize; ++i) {
67 const float nyquist = (sample_rate * .5);
69 #define YPOS(FREQ) ceil (height * (1.0 - FREQ / nyquist))
71 #define YPOS(FREQ) ceil (height * (1 - logf (1.f + .1f * _fft_data_size * FREQ / nyquist) / logf (1.f + .1f * _fft_data_size)))
74 _result.freq[0] = YPOS (50);
75 _result.freq[1] = YPOS (100);
76 _result.freq[2] = YPOS (500);
77 _result.freq[3] = YPOS (1000);
78 _result.freq[4] = YPOS (5000);
79 _result.freq[5] = YPOS (10000);
81 _fft_plan = fftwf_plan_r2r_1d (_bufsize, _fft_data_in, _fft_data_out, FFTW_R2HC, FFTW_MEASURE);
83 _hann_window = (float *) malloc (sizeof (float) * _bufsize);
86 for (uint32_t i = 0; i < _bufsize; ++i) {
87 _hann_window[i] = 0.5f - (0.5f * (float) cos (2.0f * M_PI * (float)i / (float)(_bufsize)));
88 sum += _hann_window[i];
90 const double isum = 2.0 / sum;
91 for (uint32_t i = 0; i < _bufsize; ++i) {
92 _hann_window[i] *= isum;
96 _result.n_channels = 2;
98 _result.n_channels = 1;
102 Analyser::~Analyser ()
104 delete _ebur128_plugin;
107 fftwf_destroy_plan (_fft_plan);
108 fftwf_free (_fft_data_in);
109 fftwf_free (_fft_data_out);
115 Analyser::process (ProcessContext<float> const & c)
117 framecnt_t n_samples = c.frames () / c.channels ();
118 assert (c.frames () % c.channels () == 0);
119 assert (n_samples <= _bufsize);
120 //printf ("PROC %p @%ld F: %ld, S: %ld C:%d\n", this, _pos, c.frames (), n_samples, c.channels ());
121 float const * d = c.data ();
123 for (s = 0; s < n_samples; ++s) {
125 const framecnt_t pk = (_pos + s) / _spp;
126 for (unsigned int c = 0; c < _channels; ++c) {
129 const unsigned int cc = c % _result.n_channels; // TODO optimize
130 if (_result.peaks[cc][pk].min > v) { _result.peaks[cc][pk].min = *d; }
131 if (_result.peaks[cc][pk].max < v) { _result.peaks[cc][pk].max = *d; }
132 _fft_data_in[s] += v * _hann_window[s] / (float) _channels;
137 for (; s < _bufsize; ++s) {
139 for (unsigned int c = 0; c < _channels; ++c) {
144 if (_ebur128_plugin) {
145 _ebur128_plugin->process (_bufs, Vamp::RealTime::fromSeconds ((double) _pos / _sample_rate));
148 fftwf_execute (_fft_plan);
150 _fft_power[0] = _fft_data_out[0] * _fft_data_out[0];
151 #define FRe (_fft_data_out[i])
152 #define FIm (_fft_data_out[_bufsize - i])
153 for (uint32_t i = 1; i < _fft_data_size - 1; ++i) {
154 _fft_power[i] = (FRe * FRe) + (FIm * FIm);
159 const size_t height = sizeof (_result.spectrum[0]) / sizeof (float);
160 const framecnt_t x0 = _pos / _fpp;
161 framecnt_t x1 = (_pos + n_samples) / _fpp;
162 if (x0 == x1) x1 = x0 + 1;
163 const float range = 80; // dB
165 for (uint32_t i = 1; i < _fft_data_size - 1; ++i) {
166 const float level = fft_power_at_bin (i, i);
167 if (level < -range) continue;
168 const float pk = level > 0.0 ? 1.0 : (range + level) / range;
170 const uint32_t y0 = height - ceil (i * (float) height / _fft_data_size);
171 uint32_t y1= height - ceil (i * (float) height / _fft_data_size);
173 const uint32_t y0 = height - ceilf (height * logf (1.f + .1f * i) / logf (1.f + .1f * _fft_data_size));
174 uint32_t y1 = height - ceilf (height * logf (1.f + .1f * (i + 1.f)) / logf (1.f + .1f * _fft_data_size));
176 if (y0 == y1 && y0 > 0) y1 = y0 - 1;
177 for (int x = x0; x < x1; ++x) {
178 for (uint32_t y = y0; y > y1; --y) {
179 if (_result.spectrum[x][y] < pk) { _result.spectrum[x][y] = pk; }
186 /* pass audio audio through */
187 ListedSource<float>::output (c);
190 ARDOUR::ExportAnalysisPtr
193 //printf ("PROCESSED %ld / %ld samples\n", _pos, _n_samples);
195 return ARDOUR::ExportAnalysisPtr ();
197 if (_ebur128_plugin) {
198 Vamp::Plugin::FeatureSet features = _ebur128_plugin->getRemainingFeatures ();
199 if (!features.empty () && features.size () == 3) {
200 _result.loudness = features[0][0].values[0];
201 _result.loudness_range = features[1][0].values[0];
202 assert (features[2][0].values.size () == 540);
203 for (int i = 0; i < 540; ++i) {
204 _result.loudness_hist[i] = features[2][0].values[i];
205 if (_result.loudness_hist[i] > _result.loudness_hist_max) {
206 _result.loudness_hist_max = _result.loudness_hist[i]; }
208 _result.have_loudness = true;
211 return ARDOUR::ExportAnalysisPtr (new ARDOUR::ExportAnalysis (_result));
215 Analyser::fft_power_at_bin (const uint32_t b, const float norm) const
217 const float a = _fft_power[b] * norm;
218 return a > 1e-12 ? 10.0 * fast_log10 (a) : -INFINITY;