mirror of
https://github.com/strawberrymusicplayer/strawberry
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98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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// Adapted from gstspectrum for Clementine with the following changes:
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// - Uses fftw instead of kiss fft (2x faster).
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// - Hardcoded to 1 channel (use an audioconvert element to do the work
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// instead, simplifies this code a lot).
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// - Send output via a callback instead of GST messages (less overhead).
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// - Removed all properties except interval and band.
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#ifndef GST_MOODBAR_FASTSPECTRUM_H
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#define GST_MOODBAR_FASTSPECTRUM_H
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#include <functional>
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#include <gst/gst.h>
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#include <gst/audio/gstaudiofilter.h>
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#include <fftw3.h>
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G_BEGIN_DECLS
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#define GST_TYPE_FASTSPECTRUM (gst_fastspectrum_get_type())
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#define GST_FASTSPECTRUM(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_FASTSPECTRUM,GstFastSpectrum))
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#define GST_IS_FASTSPECTRUM(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_FASTSPECTRUM))
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#define GST_FASTSPECTRUM_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_FASTSPECTRUM,GstFastSpectrumClass))
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#define GST_IS_FASTSPECTRUM_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_FASTSPECTRUM))
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class QMutex;
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typedef void (*GstFastSpectrumInputData)(const guint8* in, double* out, guint len, double max_value, guint op, guint nfft);
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typedef std::function<void(double* magnitudes, int size)> OutputCallback;
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struct GstFastSpectrum {
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GstAudioFilter parent;
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/* properties */
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guint64 interval; /* how many nanoseconds between emits */
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guint64 frames_per_interval; /* how many frames per interval */
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guint64 frames_todo;
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guint bands; /* number of spectrum bands */
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gboolean multi_channel; /* send separate channel results */
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guint64 num_frames; /* frame count (1 sample per channel)
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* since last emit */
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guint64 num_fft; /* number of FFTs since last emit */
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GstClockTime message_ts; /* starttime for next message */
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/* <private> */
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bool channel_data_initialised;
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double* input_ring_buffer;
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double* fft_input;
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fftw_complex* fft_output;
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double* spect_magnitude;
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fftw_plan plan;
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guint input_pos;
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guint64 error_per_interval;
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guint64 accumulated_error;
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GMutex lock;
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GstFastSpectrumInputData input_data;
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OutputCallback output_callback;
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};
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struct GstFastSpectrumClass {
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GstAudioFilterClass parent_class;
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// Static lock for creating & destroying FFTW plans.
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QMutex* fftw_lock;
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};
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GType gst_fastspectrum_get_type (void);
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G_END_DECLS
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#endif // GST_MOODBAR_FASTSPECTRUM_H
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