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interfaces: API: Add GstStreamVolume interface

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Fixes bug #567660.
This commit is contained in:
Sebastian Dröge 2009-09-11 14:54:17 +02:00
parent 8d2f20d1cb
commit 6e23ea172f
7 changed files with 350 additions and 1 deletions
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2
docs/libs/gst-plugins-base-libs-docs.sgml
View file

@ -37,6 +37,7 @@
<!ENTITY GstMixerTrack SYSTEM "xml/gstmixertrack.xml">
<!ENTITY GstNavigation SYSTEM "xml/gstnavigation.xml">
<!ENTITY GstPropertyProbe SYSTEM "xml/gstpropertyprobe.xml">
<!ENTITY GstStreamVolume SYSTEM "xml/gststreamvolume.xml">
<!ENTITY GstTuner SYSTEM "xml/gsttuner.xml">
<!ENTITY GstTunerChannel SYSTEM "xml/gsttunerchannel.xml">
<!ENTITY GstTunerNorm SYSTEM "xml/gsttunernorm.xml">
@ -186,6 +187,7 @@
&GstMixerTrack;
&GstNavigation;
&GstPropertyProbe;
&GstStreamVolume;
&GstTuner;
&GstTunerChannel;
&GstTunerNorm;

25
docs/libs/gst-plugins-base-libs-sections.txt
View file

@ -579,6 +579,31 @@ GST_IS_PROPERTY_PROBE
gst_property_probe_get_type
</SECTION>
<SECTION>
<FILE>gststreamvolume</FILE>
<INCLUDE>gst/interfaces/streamvolume.h</INCLUDE>
GstStreamVolume
GstStreamVolumeFormat
gst_stream_volume_get_volume
gst_stream_volume_set_volume
gst_stream_volume_get_mute
gst_stream_volume_set_mute
gst_stream_volume_convert_volume
<SUBSECTION Standard>
GstStreamVolumeInterface
GST_TYPE_STREAM_VOLUME
GST_STREAM_VOLUME
GST_STREAM_VOLUME_INTERFACE
GST_STREAM_VOLUME_GET_INTERFACE
GST_IS_STREAM_VOLUME
GST_IS_STREAM_VOLUME_INTERFACE
gst_stream_volume_get_type
</SECTION>
<SECTION>
<FILE>gsttuner</FILE>
<INCLUDE>gst/interfaces/tuner.h</INCLUDE>

4
gst-libs/gst/interfaces/Makefile.am
View file

@ -10,6 +10,7 @@ headers_interfaces = \
mixertrack.h \
navigation.h \
propertyprobe.h \
streamvolume.h \
tuner.h \
tunernorm.h \
tunerchannel.h \
@ -43,6 +44,7 @@ libgstinterfaces_@GST_MAJORMINOR@_la_SOURCES = \
mixertrack.c \
navigation.c \
propertyprobe.c \
streamvolume.c \
tuner.c \
tunernorm.c \
tunerchannel.c \
@ -54,7 +56,7 @@ nodist_libgstinterfaces_@GST_MAJORMINOR@_la_SOURCES = \
interfaces-marshal.h
libgstinterfaces_@GST_MAJORMINOR@_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_CFLAGS)
libgstinterfaces_@GST_MAJORMINOR@_la_LIBADD = $(GST_LIBS)
libgstinterfaces_@GST_MAJORMINOR@_la_LIBADD = $(GST_LIBS) $(LIBM)
libgstinterfaces_@GST_MAJORMINOR@_la_LDFLAGS = $(GST_LIB_LDFLAGS) $(GST_ALL_LDFLAGS) $(GST_LT_LDFLAGS)
BUILT_SOURCES = \

225
gst-libs/gst/interfaces/streamvolume.c Normal file
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@ -0,0 +1,225 @@
/* GStreamer Mixer
* 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.
*/
/**
* SECTION:gststreamvolume
* @short_description: Interface for elements that provide a stream volume
*
* <refsect2>
* <para>
* This interface is implemented by elements that provide a stream volume. Examples for
* such elements are #volume and #playbin2.
* </para>
* <para>
* Applications can use this interface to get or set the current stream volume. For this
* the "volume" #GObject property can be used or the helper functions gst_stream_volume_set_volume()
* and gst_stream_volume_get_volume(). This volume is always a linear factor, i.e. 0.0 is muted
* 1.0 is 100%. For showing the volume in a GUI it might make sense to convert it to
* a different format by using gst_stream_volume_convert_volume(). Volume sliders should usually
* use a cubic volume.
*
* Separate from the volume the stream can also be muted by the "mute" #GObject property or
* gst_stream_volume_set_mute() and gst_stream_volume_get_mute().
* </para>
* <para>
* Elements that provide some kind of stream volume should implement the "volume" and
* "mute" #GObject properties and handle setting and getting of them properly.
* The volume property is defined to be a linear volume factor.
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "streamvolume.h"
#include <math.h>
static void
gst_stream_volume_class_init (GstStreamVolumeInterface * iface)
{
g_object_interface_install_property (iface,
g_param_spec_double ("volume",
"Volume",
"Linear volume factor, 1.0=100%",
0.0, G_MAXDOUBLE, 1.0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_interface_install_property (iface,
g_param_spec_boolean ("mute",
"Mute",
"Mute the audio channel without changing the volume",
FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
GType
gst_stream_volume_get_type (void)
{
static volatile gsize type = 0;
if (g_once_init_enter (&type)) {
GType tmp;
static const GTypeInfo info = {
sizeof (GstStreamVolumeInterface),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) gst_stream_volume_class_init, /* class_init */
NULL, /* class_finalize */
NULL, /* class_data */
0,
0, /* n_preallocs */
NULL /* instance_init */
};
tmp = g_type_register_static (G_TYPE_INTERFACE,
"GstStreamVolume", &info, 0);
g_type_interface_add_prerequisite (tmp, G_TYPE_OBJECT);
g_once_init_leave (&type, tmp);
}
return type;
}
/**
* gst_stream_volume_get_volume:
* @volume: #GstStreamVolume that should be used
* @format: #GstStreamVolumeFormat which should be returned
*
* Returns: The current stream volume as linear factor
*
* Since: 0.10.25
*/
gdouble
gst_stream_volume_get_volume (GstStreamVolume * volume,
GstStreamVolumeFormat format)
{
gdouble val;
g_return_val_if_fail (GST_IS_STREAM_VOLUME (volume), 1.0);
g_object_get (volume, "volume", &val, NULL);
if (format != GST_STREAM_VOLUME_FORMAT_LINEAR)
val =
gst_stream_volume_convert_volume (GST_STREAM_VOLUME_FORMAT_LINEAR,
format, val);
return val;
}
/**
* gst_stream_volume_set_volume:
* @volume: #GstStreamVolume that should be used
* @format: #GstStreamVolumeFormat of @val
* @val: Linear volume factor that should be set
*
* Since: 0.10.25
*/
void
gst_stream_volume_set_volume (GstStreamVolume * volume,
GstStreamVolumeFormat format, gdouble val)
{
g_return_if_fail (GST_IS_STREAM_VOLUME (volume));
if (format != GST_STREAM_VOLUME_FORMAT_LINEAR)
val =
gst_stream_volume_convert_volume (format,
GST_STREAM_VOLUME_FORMAT_LINEAR, val);
g_object_set (volume, "volume", val, NULL);
}
/**
* gst_stream_volume_get_mute:
* @volume: #GstStreamVolume that should be used
*
* Returns: Returns %TRUE if the stream is muted
*
* Since: 0.10.25
*/
gboolean
gst_stream_volume_get_mute (GstStreamVolume * volume)
{
gboolean val;
g_return_val_if_fail (GST_IS_STREAM_VOLUME (volume), FALSE);
g_object_get (volume, "mute", &val, NULL);
return val;
}
/**
* gst_stream_volume_set_mute:
* @volume: #GstStreamVolume that should be used
* @mute: Mute state that should be set
*
* Since: 0.10.25
*/
void
gst_stream_volume_set_mute (GstStreamVolume * volume, gboolean mute)
{
g_return_if_fail (GST_IS_STREAM_VOLUME (volume));
g_object_set (volume, "mute", mute, NULL);
}
/**
* gst_stream_volume_convert_volume:
* @from: #GstStreamVolumeFormat to convert from
* @to: #GstStreamVolumeFormat to convert to
* @val: Volume in @from format that should be converted
*
* Returns: the converted volume
*
* Since: 0.10.25
*/
gdouble
gst_stream_volume_convert_volume (GstStreamVolumeFormat from,
GstStreamVolumeFormat to, gdouble val)
{
switch (from) {
case GST_STREAM_VOLUME_FORMAT_LINEAR:
g_return_val_if_fail (val >= 0.0, 0.0);
switch (to) {
case GST_STREAM_VOLUME_FORMAT_LINEAR:
return val;
case GST_STREAM_VOLUME_FORMAT_CUBIC:
return cbrt (val);
case GST_STREAM_VOLUME_FORMAT_DB:
return 20.0 * log10 (val);
}
break;
case GST_STREAM_VOLUME_FORMAT_CUBIC:
g_return_val_if_fail (val >= 0.0, 0.0);
switch (to) {
case GST_STREAM_VOLUME_FORMAT_LINEAR:
return val * val * val;
case GST_STREAM_VOLUME_FORMAT_CUBIC:
return val;
case GST_STREAM_VOLUME_FORMAT_DB:
return 3.0 * 20.0 * log10 (val);
}
break;
case GST_STREAM_VOLUME_FORMAT_DB:
switch (to) {
case GST_STREAM_VOLUME_FORMAT_LINEAR:
return pow (10.0, val / 20.0);
case GST_STREAM_VOLUME_FORMAT_CUBIC:
return pow (10.0, val / (3.0 * 20.0));
case GST_STREAM_VOLUME_FORMAT_DB:
return val;
}
break;
}
g_return_val_if_reached (0.0);
}

87
gst-libs/gst/interfaces/streamvolume.h Normal file
View file

@ -0,0 +1,87 @@
/* 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) \
(GST_IMPLEMENTS_INTERFACE_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) \
(GST_IMPLEMENTS_INTERFACE_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 parent;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
/**
* 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()
* 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__ */

1
gst/playback/Makefile.am
View file

@ -27,6 +27,7 @@ libgstplaybin_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_CFLAGS)
libgstplaybin_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
libgstplaybin_la_LIBADD = \
$(top_builddir)/gst-libs/gst/pbutils/libgstpbutils-@GST_MAJORMINOR@.la \
$(top_builddir)/gst-libs/gst/interfaces/libgstinterfaces-@GST_MAJORMINOR@.la \
$(GST_LIBS)
libgstplaybin_la_LIBTOOLFLAGS = --tag=disable-static

7
win32/common/libgstinterfaces.def
View file

@ -76,6 +76,13 @@ EXPORTS
gst_property_probe_probe_and_get_values_name
gst_property_probe_probe_property
gst_property_probe_probe_property_name
gst_stream_volume_convert_volume
gst_stream_volume_format_get_type
gst_stream_volume_get_mute
gst_stream_volume_get_type
gst_stream_volume_get_volume
gst_stream_volume_set_mute
gst_stream_volume_set_volume
gst_tuner_channel_changed
gst_tuner_channel_flags_get_type
gst_tuner_channel_get_type