mirror of
https://github.com/strawberrymusicplayer/strawberry
synced 2024-12-13 09:07:04 +01:00
97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
/* GStreamer
|
|
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
|
|
* Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
|
|
*
|
|
* 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 <functional>
|
|
|
|
#include <gst/gst.h>
|
|
#include <gst/audio/gstaudiofilter.h>
|
|
#include <fftw3.h>
|
|
|
|
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);
|
|
|
|
typedef std::function<void(double *magnitudes, int size)> OutputCallback;
|
|
|
|
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
|
|
|
|
// <private>
|
|
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
|