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371e3e460a
We need different export decorators for the different libs. For now no actual change though, just rename before the release, and add prelude headers to define the new decorator to GST_EXPORT.
89 lines
3.2 KiB
C
89 lines
3.2 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 \
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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_IS_STREAM_VOLUME(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE ((obj), 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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GST_AUDIO_API
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GType gst_stream_volume_get_type (void);
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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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