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