gstreamer/gst/spectrum/gstspectrum.h
Sebastian Dröge d912a42065 gst/spectrum/gstspectrum.*: Implement a simple compensation algorithm for rounding errors.
Original commit message from CVS:
* gst/spectrum/gstspectrum.c: (gst_spectrum_reset_state),
(gst_spectrum_transform_ip):
* gst/spectrum/gstspectrum.h:
Implement a simple compensation algorithm for rounding errors.
This makes sure that a spectrum message is posted on the bus
every interval nanoseconds. Fixes bug .
2009-01-19 10:13:53 +00:00

79 lines
2.7 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_SPECTRUM_H__
#define __GST_SPECTRUM_H__
#include <gst/gst.h>
#include <gst/audio/gstaudiofilter.h>
#include <gst/fft/gstfftf32.h>
G_BEGIN_DECLS
#define GST_TYPE_SPECTRUM (gst_spectrum_get_type())
#define GST_SPECTRUM(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SPECTRUM,GstSpectrum))
#define GST_IS_SPECTRUM(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_SPECTRUM))
#define GST_SPECTRUM_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_SPECTRUM,GstSpectrumClass))
#define GST_IS_SPECTRUM_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_SPECTRUM))
typedef struct _GstSpectrum GstSpectrum;
typedef struct _GstSpectrumClass GstSpectrumClass;
struct _GstSpectrum
{
GstAudioFilter parent;
/* properties */
gboolean message; /* whether or not to post messages */
gboolean message_magnitude;
gboolean message_phase;
guint64 interval; /* how many nanoseconds between emits */
guint64 frames_per_interval; /* how many frames per interval */
guint bands; /* number of spectrum bands */
gint threshold; /* energy level treshold */
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> */
gfloat *input;
guint input_pos;
gfloat *input_tmp;
GstFFTF32Complex *freqdata;
gfloat *spect_magnitude;
gfloat *spect_phase;
GstFFTF32 *fft_ctx;
guint64 error_per_interval;
guint64 accumulated_error;
};
struct _GstSpectrumClass
{
GstAudioFilterClass parent_class;
};
GType gst_spectrum_get_type (void);
G_END_DECLS
#endif /* __GST_SPECTRUM_H__ */