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81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
/* GStreamer StreamVolume
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_STREAM_VOLUME_H__
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#define __GST_STREAM_VOLUME_H__
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#include <gst/gst.h>
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#include <gst/audio/audio-prelude.h>
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G_BEGIN_DECLS
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#define GST_TYPE_STREAM_VOLUME (gst_stream_volume_get_type ())
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GST_AUDIO_API
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G_DECLARE_INTERFACE (GstStreamVolume, gst_stream_volume, GST, STREAM_VOLUME,
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GObject)
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#define GST_STREAM_VOLUME_GET_INTERFACE(obj) GST_STREAM_VOLUME_GET_IFACE(obj)
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struct _GstStreamVolumeInterface {
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GTypeInterface iface;
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};
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/**
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* GstStreamVolumeFormat:
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* @GST_STREAM_VOLUME_FORMAT_LINEAR: Linear scale factor, 1.0 = 100%
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* @GST_STREAM_VOLUME_FORMAT_CUBIC: Cubic volume scale
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* @GST_STREAM_VOLUME_FORMAT_DB: Logarithmic volume scale (dB, amplitude not power)
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*
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* Different representations of a stream volume. gst_stream_volume_convert_volume()
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* allows to convert between the different representations.
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*
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* Formulas to convert from a linear to a cubic or dB volume are
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* cbrt(val) and 20 * log10 (val).
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*/
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typedef enum {
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GST_STREAM_VOLUME_FORMAT_LINEAR = 0,
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GST_STREAM_VOLUME_FORMAT_CUBIC,
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GST_STREAM_VOLUME_FORMAT_DB
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} GstStreamVolumeFormat;
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GST_AUDIO_API
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void gst_stream_volume_set_volume (GstStreamVolume *volume,
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GstStreamVolumeFormat format,
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gdouble val);
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GST_AUDIO_API
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gdouble gst_stream_volume_get_volume (GstStreamVolume *volume,
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GstStreamVolumeFormat format);
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GST_AUDIO_API
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void gst_stream_volume_set_mute (GstStreamVolume *volume,
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gboolean mute);
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GST_AUDIO_API
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gboolean gst_stream_volume_get_mute (GstStreamVolume *volume);
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GST_AUDIO_API
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gdouble gst_stream_volume_convert_volume (GstStreamVolumeFormat from,
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GstStreamVolumeFormat to,
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gdouble val) G_GNUC_CONST;
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G_END_DECLS
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#endif /* __GST_STREAM_VOLUME_H__ */
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