1 /* GStreamer
2  * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Library General Public
6  * License as published by the Free Software Foundation; either
7  * version 2 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * Library General Public License for more details.
13  *
14  * You should have received a copy of the GNU Library General Public
15  * License along with this library; if not, write to the
16  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
17  * Boston, MA 02110-1301, USA.
18  */
19 
20 
21 #ifndef __GST_CUTTER_H__
22 #define __GST_CUTTER_H__
23 
24 
25 #include <gst/gst.h>
26 /* #include <gst/meta/audioraw.h> */
27 
28 
29 #ifdef __cplusplus
30 extern "C" {
31 #endif /* __cplusplus */
32 
33 
34 #define GST_TYPE_CUTTER \
35   (gst_cutter_get_type())
36 #define GST_CUTTER(obj) \
37   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_CUTTER,GstCutter))
38 #define GST_CUTTER_CLASS(klass) \
39   (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_CUTTER,GstCutterClass))
40 #define GST_IS_CUTTER(obj) \
41   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_CUTTER))
42 #define GST_IS_CUTTER_CLASS(klass) \
43   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_CUTTER))
44 
45 typedef struct _GstCutter GstCutter;
46 typedef struct _GstCutterClass GstCutterClass;
47 
48 struct _GstCutter
49 {
50   GstElement element;
51 
52   GstPad *sinkpad, *srcpad;
53 
54   double threshold_level;       /* level below which to cut */
55   double threshold_length;      /* how long signal has to remain
56                                  * below this level before cutting */
57   double silent_run_length;     /* how long has it been below threshold ? */
58   gboolean silent;
59   gboolean silent_prev;
60 
61   double pre_length;            /* how long can the pre-record buffer be ? */
62   double pre_run_length;        /* how long is it currently ? */
63   GList *pre_buffer;            /* list of GstBuffers in pre-record buffer */
64   gboolean leaky;               /* do we leak an overflowing prebuffer ? */
65 
66   GstAudioInfo info;
67 };
68 
69 struct _GstCutterClass
70 {
71   GstElementClass parent_class;
72   void (*cut_start) (GstCutter* filter);
73   void (*cut_stop) (GstCutter* filter);
74 };
75 
76 GType gst_cutter_get_type (void);
77 
78 #ifdef __cplusplus
79 }
80 #endif /* __cplusplus */
81 
82 
83 #endif /* __GST_STEREO_H__ */
84