1 /* GStreamer 2 * Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu> 3 * Copyright (C) 2000,2001,2002,2003,2005 4 * Thomas Vander Stichele <thomas at apestaart dot org> 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Library General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Library General Public License for more details. 15 * 16 * You should have received a copy of the GNU Library General Public 17 * License along with this library; if not, write to the 18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, 19 * Boston, MA 02110-1301, USA. 20 */ 21 22 23 #ifndef __GST_LEVEL_H__ 24 #define __GST_LEVEL_H__ 25 26 27 #include <gst/gst.h> 28 #include <gst/base/gstbasetransform.h> 29 #include <gst/audio/audio.h> 30 31 G_BEGIN_DECLS 32 33 34 #define GST_TYPE_LEVEL \ 35 (gst_level_get_type()) 36 #define GST_LEVEL(obj) \ 37 (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_LEVEL,GstLevel)) 38 #define GST_LEVEL_CLASS(klass) \ 39 (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_LEVEL,GstLevelClass)) 40 #define GST_LEVEL_GET_CLASS(obj) \ 41 (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_LEVEL,GstLevelClass)) 42 #define GST_IS_LEVEL(obj) \ 43 (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_LEVEL)) 44 #define GST_IS_LEVEL_CLASS(klass) \ 45 (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_LEVEL)) 46 47 48 typedef struct _GstLevel GstLevel; 49 typedef struct _GstLevelClass GstLevelClass; 50 51 /** 52 * GstLevel: 53 * 54 * Opaque data structure. 55 */ 56 struct _GstLevel { 57 GstBaseTransform element; 58 59 /* properties, protected by object lock */ 60 gboolean post_messages; /* whether or not to post messages */ 61 guint64 interval; /* how many nanoseconds between emits */ 62 gdouble decay_peak_ttl; /* time to live for peak in nanoseconds */ 63 gdouble decay_peak_falloff; /* falloff in dB/sec */ 64 gboolean audio_level_meta; /* whether or not generate GstAudioLevelMeta */ 65 66 GstAudioInfo info; 67 gint num_frames; /* frame count (1 sample per channel) 68 * since last emit */ 69 gint interval_frames; /* after how many frame to sent a message */ 70 GstClockTime message_ts; /* starttime for next message */ 71 72 /* per-channel arrays for intermediate values */ 73 gdouble *CS; /* normalized Cumulative Square */ 74 gdouble *peak; /* normalized Peak value over buffer */ 75 gdouble *last_peak; /* last normalized Peak value over interval */ 76 gdouble *decay_peak; /* running decaying normalized Peak */ 77 gdouble *decay_peak_base; /* value of last peak we are decaying from */ 78 GstClockTime *decay_peak_age; /* age of last peak */ 79 80 void (*process)(gpointer, guint, guint, gdouble*, gdouble*); 81 }; 82 83 struct _GstLevelClass { 84 GstBaseTransformClass parent_class; 85 }; 86 87 GType gst_level_get_type (void); 88 89 GST_ELEMENT_REGISTER_DECLARE (level); 90 91 G_END_DECLS 92 93 94 #endif /* __GST_LEVEL_H__ */ 95