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82 lines
3.3 KiB
C
82 lines
3.3 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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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G_BEGIN_DECLS
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#define GST_TYPE_STREAM_VOLUME \
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(gst_stream_volume_get_type ())
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#define GST_STREAM_VOLUME(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_STREAM_VOLUME, GstStreamVolume))
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#define GST_STREAM_VOLUME_INTERFACE(iface) \
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(G_TYPE_CHECK_INTERFACE_CAST ((iface), GST_TYPE_STREAM_VOLUME, GstStreamVolumeInterface))
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#define GST_IS_STREAM_VOLUME(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_STREAM_VOLUME))
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#define GST_IS_STREAM_VOLUME_INTERFACE(iface) \
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(G_TYPE_CHECK_INTERFACE_TYPE ((iface), GST_TYPE_STREAM_VOLUME))
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#define GST_STREAM_VOLUME_GET_INTERFACE(inst) \
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(G_TYPE_INSTANCE_GET_INTERFACE ((inst), GST_TYPE_STREAM_VOLUME, GstStreamVolumeInterface))
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typedef struct _GstStreamVolume GstStreamVolume;
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typedef struct _GstStreamVolumeInterface GstStreamVolumeInterface;
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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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GType gst_stream_volume_get_type (void);
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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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gdouble gst_stream_volume_get_volume (GstStreamVolume *volume,
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GstStreamVolumeFormat format);
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void gst_stream_volume_set_mute (GstStreamVolume *volume,
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gboolean mute);
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gboolean gst_stream_volume_get_mute (GstStreamVolume *volume);
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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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