mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-09 10:59:39 +00:00
84 lines
3.3 KiB
C
84 lines
3.3 KiB
C
/* GStreamer StreamVolume
|
|
* Copyright (C) 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#ifndef __GST_STREAM_VOLUME_H__
|
|
#define __GST_STREAM_VOLUME_H__
|
|
|
|
#include <gst/gst.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
#define GST_TYPE_STREAM_VOLUME \
|
|
(gst_stream_volume_get_type ())
|
|
#define GST_STREAM_VOLUME(obj) \
|
|
(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_STREAM_VOLUME, GstStreamVolume))
|
|
#define GST_STREAM_VOLUME_INTERFACE(iface) \
|
|
(G_TYPE_CHECK_INTERFACE_CAST ((iface), GST_TYPE_STREAM_VOLUME, GstStreamVolumeInterface))
|
|
#define GST_IS_STREAM_VOLUME(obj) \
|
|
(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_STREAM_VOLUME))
|
|
#define GST_IS_STREAM_VOLUME_INTERFACE(iface) \
|
|
(G_TYPE_CHECK_INTERFACE_TYPE ((iface), GST_TYPE_STREAM_VOLUME))
|
|
#define GST_STREAM_VOLUME_GET_INTERFACE(inst) \
|
|
(G_TYPE_INSTANCE_GET_INTERFACE ((inst), GST_TYPE_STREAM_VOLUME, GstStreamVolumeInterface))
|
|
|
|
typedef struct _GstStreamVolume GstStreamVolume;
|
|
typedef struct _GstStreamVolumeInterface GstStreamVolumeInterface;
|
|
|
|
struct _GstStreamVolumeInterface {
|
|
GTypeInterface iface;
|
|
};
|
|
|
|
/**
|
|
* GstStreamVolumeFormat:
|
|
* @GST_STREAM_VOLUME_FORMAT_LINEAR: Linear scale factor, 1.0 = 100%
|
|
* @GST_STREAM_VOLUME_FORMAT_CUBIC: Cubic volume scale
|
|
* @GST_STREAM_VOLUME_FORMAT_DB: Logarithmic volume scale (dB, amplitude not power)
|
|
*
|
|
* Different representations of a stream volume. gst_stream_volume_convert_volume()
|
|
* allows to convert between the different representations.
|
|
*
|
|
* Formulas to convert from a linear to a cubic or dB volume are
|
|
* cbrt(val) and 20 * log10 (val).
|
|
*
|
|
* Since: 0.10.25
|
|
*/
|
|
typedef enum {
|
|
GST_STREAM_VOLUME_FORMAT_LINEAR = 0,
|
|
GST_STREAM_VOLUME_FORMAT_CUBIC,
|
|
GST_STREAM_VOLUME_FORMAT_DB
|
|
} GstStreamVolumeFormat;
|
|
|
|
GType gst_stream_volume_get_type (void);
|
|
void gst_stream_volume_set_volume (GstStreamVolume *volume,
|
|
GstStreamVolumeFormat format,
|
|
gdouble val);
|
|
gdouble gst_stream_volume_get_volume (GstStreamVolume *volume,
|
|
GstStreamVolumeFormat format);
|
|
|
|
void gst_stream_volume_set_mute (GstStreamVolume *volume,
|
|
gboolean mute);
|
|
gboolean gst_stream_volume_get_mute (GstStreamVolume *volume);
|
|
|
|
gdouble gst_stream_volume_convert_volume (GstStreamVolumeFormat from,
|
|
GstStreamVolumeFormat to,
|
|
gdouble val) G_GNUC_CONST;
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __GST_STREAM_VOLUME_H__ */
|