gstreamer/gst/spectrum/gstspectrum.h
Stefan Kost fb071dd89e spectrum: refactor processing loop for block based operation
Previously the chain function was working sample frame based. In each cycle it
was checking if it is time to run a fft or if it is time to send a message.
Now we changed the data transform functions to work on a block of data and
calculate the max length until either {end-of-data, do-fft, do-msg}. This allows
us also to avoid the duplicated code for the single and multi-channel case (as
the transformers have the same signature now).
2011-03-25 00:15:48 +02:00

93 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., 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;
typedef struct _GstSpectrumChannel GstSpectrumChannel;
typedef void (*GstSpectrumInputData)(const guint8 * in, gfloat * out,
guint len, guint channels, gfloat max_value, guint op, guint nfft);
struct _GstSpectrumChannel
{
gfloat *input;
gfloat *input_tmp;
GstFFTF32Complex *freqdata;
gfloat *spect_magnitude; /* accumulated mangitude and phase */
gfloat *spect_phase; /* will be scaled by num_fft before sending */
GstFFTF32 *fft_ctx;
};
struct _GstSpectrum
{
GstAudioFilter parent;
/* properties */
gboolean post_messages; /* 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 */
guint64 frames_todo;
guint bands; /* number of spectrum bands */
gint threshold; /* energy level treshold */
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> */
GstSpectrumChannel *channel_data;
guint num_channels;
guint input_pos;
guint64 error_per_interval;
guint64 accumulated_error;
GstSpectrumInputData input_data;
};
struct _GstSpectrumClass
{
GstAudioFilterClass parent_class;
};
GType gst_spectrum_get_type (void);
G_END_DECLS
#endif /* __GST_SPECTRUM_H__ */