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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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fb071dd89e
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).
93 lines
3.2 KiB
C
93 lines
3.2 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_SPECTRUM_H__
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#define __GST_SPECTRUM_H__
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#include <gst/gst.h>
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#include <gst/audio/gstaudiofilter.h>
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#include <gst/fft/gstfftf32.h>
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G_BEGIN_DECLS
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#define GST_TYPE_SPECTRUM (gst_spectrum_get_type())
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#define GST_SPECTRUM(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SPECTRUM,GstSpectrum))
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#define GST_IS_SPECTRUM(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_SPECTRUM))
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#define GST_SPECTRUM_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_SPECTRUM,GstSpectrumClass))
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#define GST_IS_SPECTRUM_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_SPECTRUM))
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typedef struct _GstSpectrum GstSpectrum;
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typedef struct _GstSpectrumClass GstSpectrumClass;
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typedef struct _GstSpectrumChannel GstSpectrumChannel;
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typedef void (*GstSpectrumInputData)(const guint8 * in, gfloat * out,
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guint len, guint channels, gfloat max_value, guint op, guint nfft);
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struct _GstSpectrumChannel
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{
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gfloat *input;
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gfloat *input_tmp;
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GstFFTF32Complex *freqdata;
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gfloat *spect_magnitude; /* accumulated mangitude and phase */
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gfloat *spect_phase; /* will be scaled by num_fft before sending */
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GstFFTF32 *fft_ctx;
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};
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struct _GstSpectrum
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{
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GstAudioFilter parent;
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/* properties */
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gboolean post_messages; /* whether or not to post messages */
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gboolean message_magnitude;
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gboolean message_phase;
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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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gint threshold; /* energy level treshold */
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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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GstSpectrumChannel *channel_data;
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guint num_channels;
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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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GstSpectrumInputData input_data;
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};
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struct _GstSpectrumClass
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{
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GstAudioFilterClass parent_class;
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};
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GType gst_spectrum_get_type (void);
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G_END_DECLS
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#endif /* __GST_SPECTRUM_H__ */
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