1 /* GStreamer
2  * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
3  * Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Library General Public
7  * License as published by the Free Software Foundation; either
8  * version 2 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * Library General Public License for more details.
14  *
15  * You should have received a copy of the GNU Library General Public
16  * License along with this library; if not, write to the
17  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18  * Boston, MA 02110-1301, USA.
19  */
20 
21 
22 #ifndef __GST_SPECTRUM_H__
23 #define __GST_SPECTRUM_H__
24 
25 #include <gst/gst.h>
26 #include <gst/audio/gstaudiofilter.h>
27 #include <gst/fft/gstfftf32.h>
28 
29 G_BEGIN_DECLS
30 
31 #define GST_TYPE_SPECTRUM            (gst_spectrum_get_type())
32 #define GST_SPECTRUM(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SPECTRUM,GstSpectrum))
33 #define GST_IS_SPECTRUM(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_SPECTRUM))
34 #define GST_SPECTRUM_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_SPECTRUM,GstSpectrumClass))
35 #define GST_IS_SPECTRUM_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_SPECTRUM))
36 typedef struct _GstSpectrum GstSpectrum;
37 typedef struct _GstSpectrumClass GstSpectrumClass;
38 typedef struct _GstSpectrumChannel GstSpectrumChannel;
39 
40 typedef void (*GstSpectrumInputData)(const guint8 * in, gfloat * out,
41     guint len, guint channels, gfloat max_value, guint op, guint nfft);
42 
43 struct _GstSpectrumChannel
44 {
45   gfloat *input;
46   gfloat *input_tmp;
47   GstFFTF32Complex *freqdata;
48   gfloat *spect_magnitude;      /* accumulated mangitude and phase */
49   gfloat *spect_phase;          /* will be scaled by num_fft before sending */
50   GstFFTF32 *fft_ctx;
51 };
52 
53 struct _GstSpectrum
54 {
55   GstAudioFilter parent;
56 
57   /* properties */
58   gboolean post_messages;       /* whether or not to post messages */
59   gboolean message_magnitude;
60   gboolean message_phase;
61   guint64 interval;             /* how many nanoseconds between emits */
62   guint64 frames_per_interval;  /* how many frames per interval */
63   guint64 frames_todo;
64   guint bands;                  /* number of spectrum bands */
65   gint threshold;               /* energy level treshold */
66   gboolean multi_channel;       /* send separate channel results */
67 
68   guint64 num_frames;           /* frame count (1 sample per channel)
69                                  * since last emit */
70   guint64 num_fft;              /* number of FFTs since last emit */
71   GstClockTime message_ts;      /* starttime for next message */
72 
73   /* <private> */
74   GstSpectrumChannel *channel_data;
75   guint num_channels;
76 
77   guint input_pos;
78   guint64 error_per_interval;
79   guint64 accumulated_error;
80 
81   GMutex lock;
82 
83   GstSpectrumInputData input_data;
84 };
85 
86 struct _GstSpectrumClass
87 {
88   GstAudioFilterClass parent_class;
89 };
90 
91 GType gst_spectrum_get_type (void);
92 
93 G_END_DECLS
94 
95 #endif /* __GST_SPECTRUM_H__ */
96