/* -*- c-basic-offset: 2 -*-
* vi:si:et:sw=2:sts=8:ts=8:expandtab
*
* GStreamer
* Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) 2005 Andy Wingo <wingo@pobox.com>
*
* 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:element-volume
*
* <refsect2>
* <para>
* The volume element changes the volume of the audio data.
* </para>
* <title>Example launch line</title>
* <para>
* <programlisting>
* gst-launch -v -m audiotestsrc ! volume volume=0.5 ! level ! fakesink silent=TRUE
* </programlisting>
* This pipeline shows that the level of audiotestsrc has been halved
* (peak values are around -6 dB and RMS around -9 dB) compared to
* the same pipeline without the volume element.
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst_global.h>
#include <string.h>
#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
#include <gst/audio/audio.h>
#include <gst/interfaces/mixer.h>
#include <gst/controller/gstcontroller.h>
#include <gst/audio/audio.h>
#include <gst/audio/gstaudiofilter.h>
#include <gst/liboil.h>
#include "gstvolume.h"
/* some defines for audio processing */
/* the volume factor is a range from 0.0 to (arbitrary) VOLUME_MAX_DOUBLE = 10.0
* we map 1.0 to VOLUME_UNITY_INT*
*/
#define VOLUME_UNITY_INT8 32 /* internal int for unity 2^(8-3) */
#define VOLUME_UNITY_INT8_BIT_SHIFT 5 /* number of bits to shift for unity */
#define VOLUME_UNITY_INT16 8192 /* internal int for unity 2^(16-3) */
#define VOLUME_UNITY_INT16_BIT_SHIFT 13 /* number of bits to shift for unity */
#define VOLUME_UNITY_INT24 2097152 /* internal int for unity 2^(24-3) */
#define VOLUME_UNITY_INT24_BIT_SHIFT 21 /* number of bits to shift for unity */
#define VOLUME_UNITY_INT32 134217728 /* internal int for unity 2^(32-5) */
#define VOLUME_UNITY_INT32_BIT_SHIFT 27
#define VOLUME_MAX_DOUBLE 10.0
#define VOLUME_MAX_INT8 G_MAXINT8
#define VOLUME_MIN_INT8 G_MININT8
#define VOLUME_MAX_INT16 G_MAXINT16
#define VOLUME_MIN_INT16 G_MININT16
#define VOLUME_MAX_INT24 8388607
#define VOLUME_MIN_INT24 -8388608
#define VOLUME_MAX_INT32 G_MAXINT32
#define VOLUME_MIN_INT32 G_MININT32
/* number of steps we use for the mixer interface to go from 0.0 to 1.0 */
# define VOLUME_STEPS 100
#define GST_CAT_DEFAULT gst_volume_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
static const GstElementDetails volume_details = GST_ELEMENT_DETAILS ("Volume",
"Filter/Effect/Audio",
"Set volume on audio/raw streams",
"Andy Wingo <wingo@pobox.com>");
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_SILENT,
PROP_MUTE,
PROP_VOLUME
};
#define ALLOWED_CAPS \
"audio/x-raw-float, " \
"rate = (int) [ 1, MAX ], " \
"channels = (int) [ 1, MAX ], " \
"endianness = (int) BYTE_ORDER, " \
"width = (int) {32, 64}; " \
"audio/x-raw-int, " \
"channels = (int) [ 1, MAX ], " \
"rate = (int) [ 1, MAX ], " \
"endianness = (int) BYTE_ORDER, " \
"width = (int) 8, " \
"depth = (int) 8, " \
"signed = (bool) TRUE; " \
"audio/x-raw-int, " \
"channels = (int) [ 1, MAX ], " \
"rate = (int) [ 1, MAX ], " \
"endianness = (int) BYTE_ORDER, " \
"width = (int) 16, " \
"depth = (int) 16, " \
"signed = (bool) TRUE; " \
"audio/x-raw-int, " \
"channels = (int) [ 1, MAX ], " \
"rate = (int) [ 1, MAX ], " \
"endianness = (int) BYTE_ORDER, " \
"width = (int) 24, " \
"depth = (int) 24, " \
"signed = (bool) TRUE; " \
"audio/x-raw-int, " \
"channels = (int) [ 1, MAX ], " \
"rate = (int) [ 1, MAX ], " \
"endianness = (int) BYTE_ORDER, " \
"width = (int) 32, " \
"depth = (int) 32, " \
"signed = (bool) TRUE"
static void gst_volume_interface_init (GstImplementsInterfaceClass * klass);
static void gst_volume_mixer_init (GstMixerClass * iface);
#define _init_interfaces(type) \
{ \
static const GInterfaceInfo voliface_info = { \
(GInterfaceInitFunc) gst_volume_interface_init, \
NULL, \
NULL \
}; \
static const GInterfaceInfo volmixer_info = { \
(GInterfaceInitFunc) gst_volume_mixer_init, \
NULL, \
NULL \
}; \
\
g_type_add_interface_static (type, GST_TYPE_IMPLEMENTS_INTERFACE, \
&voliface_info); \
g_type_add_interface_static (type, GST_TYPE_MIXER, &volmixer_info); \
}
GST_BOILERPLATE_FULL (GstVolume, gst_volume, GstAudioFilter,
GST_TYPE_AUDIO_FILTER, _init_interfaces);
static void volume_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void volume_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void volume_update_volume (const GValue * value, gpointer data);
static void volume_update_mute (const GValue * value, gpointer data);
static GstFlowReturn volume_transform_ip (GstBaseTransform * base,
GstBuffer * outbuf);
static gboolean volume_setup (GstAudioFilter * filter,
GstRingBufferSpec * format);
static void volume_process_double (GstVolume * this, gpointer bytes,
guint n_bytes);
static void volume_process_float (GstVolume * this, gpointer bytes,
guint n_bytes);
static void volume_process_int32 (GstVolume * this, gpointer bytes,
guint n_bytes);
static void volume_process_int32_clamp (GstVolume * this, gpointer bytes,
guint n_bytes);
static void volume_process_int24 (GstVolume * this, gpointer bytes,
guint n_bytes);
static void volume_process_int24_clamp (GstVolume * this, gpointer bytes,
guint n_bytes);
static void volume_process_int16 (GstVolume * this, gpointer bytes,
guint n_bytes);
static void volume_process_int16_clamp (GstVolume * this, gpointer bytes,
guint n_bytes);
static void volume_process_int8 (GstVolume * this, gpointer bytes,
guint n_bytes);
static void volume_process_int8_clamp (GstVolume * this, gpointer bytes,
guint n_bytes);
/* helper functions */
static gboolean
volume_choose_func (GstVolume * this)
{
this->process = NULL;
if (GST_AUDIO_FILTER (this)->format.caps == NULL)
return FALSE;
switch (GST_AUDIO_FILTER (this)->format.type) {
case GST_BUFTYPE_LINEAR:
switch (GST_AUDIO_FILTER (this)->format.width) {
case 32:
/* only clamp if the gain is greater than 1.0
* FIXME: real_vol_i can change while processing the buffer!
*/
if (this->real_vol_i32 > VOLUME_UNITY_INT32)
this->process = volume_process_int32_clamp;
else
this->process = volume_process_int32;
break;
case 24:
/* only clamp if the gain is greater than 1.0
* FIXME: real_vol_i can change while processing the buffer!
*/
if (this->real_vol_i24 > VOLUME_UNITY_INT24)
this->process = volume_process_int24_clamp;
else
this->process = volume_process_int24;
break;
case 16:
/* only clamp if the gain is greater than 1.0
* FIXME: real_vol_i can change while processing the buffer!
*/
if (this->real_vol_i16 > VOLUME_UNITY_INT16)
this->process = volume_process_int16_clamp;
else
this->process = volume_process_int16;
break;
case 8:
/* only clamp if the gain is greater than 1.0
* FIXME: real_vol_i can change while processing the buffer!
*/
if (this->real_vol_i16 > VOLUME_UNITY_INT8)
this->process = volume_process_int8_clamp;
else
this->process = volume_process_int8;
break;
}
break;
case GST_BUFTYPE_FLOAT:
switch (GST_AUDIO_FILTER (this)->format.width) {
case 32:
this->process = volume_process_float;
break;
case 64:
this->process = volume_process_double;
break;
}
break;
default:
break;
}
return (this->process != NULL);
}
static void
volume_update_real_volume (GstVolume * this)
{
gboolean passthrough = FALSE;
if (this->mute) {
this->real_vol_f = 0.0;
this->real_vol_i8 = this->real_vol_i16 = this->real_vol_i24 =
this->real_vol_i32 = 0;
} else {
this->real_vol_f = this->volume_f;
this->real_vol_i8 = this->volume_i8;
this->real_vol_i16 = this->volume_i16;
this->real_vol_i24 = this->volume_i24;
this->real_vol_i32 = this->volume_i32;
passthrough = (this->volume_i16 == VOLUME_UNITY_INT16);
}
if (this->real_vol_f != 0.0)
this->silent_buffer = FALSE;
volume_choose_func (this);
gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (this), passthrough);
}
/* Mixer interface */
static gboolean
gst_volume_interface_supported (GstImplementsInterface * iface, GType type)
{
g_assert (type == GST_TYPE_MIXER);
return TRUE;
}
static void
gst_volume_interface_init (GstImplementsInterfaceClass * klass)
{
klass->supported = gst_volume_interface_supported;
}
static const GList *
gst_volume_list_tracks (GstMixer * mixer)
{
GstVolume *this = GST_VOLUME (mixer);
g_return_val_if_fail (this != NULL, NULL);
g_return_val_if_fail (GST_IS_VOLUME (this), NULL);
return this->tracklist;
}
static void
gst_volume_set_volume (GstMixer * mixer, GstMixerTrack * track, gint * volumes)
{
GstVolume *this = GST_VOLUME (mixer);
g_return_if_fail (this != NULL);
g_return_if_fail (GST_IS_VOLUME (this));
this->volume_f = (gfloat) volumes[0] / VOLUME_STEPS;
this->volume_i32 = this->volume_f * VOLUME_UNITY_INT32;
this->volume_i24 = this->volume_f * VOLUME_UNITY_INT24;
this->volume_i16 = this->volume_f * VOLUME_UNITY_INT16;
this->volume_i8 = this->volume_f * VOLUME_UNITY_INT8;
volume_update_real_volume (this);
}
static void
gst_volume_get_volume (GstMixer * mixer, GstMixerTrack * track, gint * volumes)
{
GstVolume *this = GST_VOLUME (mixer);
g_return_if_fail (this != NULL);
g_return_if_fail (GST_IS_VOLUME (this));
volumes[0] = (gint) this->volume_f * VOLUME_STEPS;
}
static void
gst_volume_set_mute (GstMixer * mixer, GstMixerTrack * track, gboolean mute)
{
GstVolume *this = GST_VOLUME (mixer);
g_return_if_fail (this != NULL);
g_return_if_fail (GST_IS_VOLUME (this));
this->mute = mute;
volume_update_real_volume (this);
}
static void
gst_volume_mixer_init (GstMixerClass * klass)
{
GST_MIXER_TYPE (klass) = GST_MIXER_SOFTWARE;
/* default virtual functions */
klass->list_tracks = gst_volume_list_tracks;
klass->set_volume = gst_volume_set_volume;
klass->get_volume = gst_volume_get_volume;
klass->set_mute = gst_volume_set_mute;
}
/* Element class */
static void
gst_volume_dispose (GObject * object)
{
GstVolume *volume = GST_VOLUME (object);
if (volume->tracklist) {
if (volume->tracklist->data)
g_object_unref (volume->tracklist->data);
g_list_free (volume->tracklist);
volume->tracklist = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_volume_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
GstAudioFilterClass *filter_class = GST_AUDIO_FILTER_CLASS (g_class);
GstCaps *caps;
gst_element_class_set_details (element_class, &volume_details);
caps = gst_caps_from_string (ALLOWED_CAPS);
gst_audio_filter_class_add_pad_templates (filter_class, caps);
gst_caps_unref (caps);
}
static void
gst_volume_class_init (GstVolumeClass * klass)
{
GObjectClass *gobject_class;
GstBaseTransformClass *trans_class;
GstAudioFilterClass *filter_class;
gobject_class = (GObjectClass *) klass;
trans_class = (GstBaseTransformClass *) klass;
filter_class = (GstAudioFilterClass *) (klass);
gobject_class->set_property = volume_set_property;
gobject_class->get_property = volume_get_property;
gobject_class->dispose = gst_volume_dispose;
g_object_class_install_property (gobject_class, PROP_MUTE,
g_param_spec_boolean ("mute", "Mute", "mute channel",
FALSE, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
g_object_class_install_property (gobject_class, PROP_VOLUME,
g_param_spec_double ("volume", "Volume", "volume factor",
0.0, VOLUME_MAX_DOUBLE, 1.0,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "volume", 0, "Volume gain");
trans_class->transform_ip = GST_DEBUG_FUNCPTR (volume_transform_ip);
filter_class->setup = GST_DEBUG_FUNCPTR (volume_setup);
}
static void
gst_volume_init (GstVolume * this, GstVolumeClass * g_class)
{
GstMixerTrack *track = NULL;
this->mute = FALSE;
this->volume_i8 = this->real_vol_i8 = VOLUME_UNITY_INT8;
this->volume_i16 = this->real_vol_i16 = VOLUME_UNITY_INT16;
this->volume_i24 = this->real_vol_i24 = VOLUME_UNITY_INT24;
this->volume_i32 = this->real_vol_i32 = VOLUME_UNITY_INT32;
this->volume_f = this->real_vol_f = 1.0;
this->tracklist = NULL;
track = g_object_new (GST_TYPE_MIXER_TRACK, NULL);
if (GST_IS_MIXER_TRACK (track)) {
track->label = g_strdup ("volume");
track->num_channels = 1;
track->min_volume = 0;
track->max_volume = VOLUME_STEPS;
track->flags = GST_MIXER_TRACK_SOFTWARE;
this->tracklist = g_list_append (this->tracklist, track);
}
gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM (this), TRUE);
}
/* NOTE: although it might be tempting to have volume_process_mute() which uses
* memset(bytes, 0, nbytes) for the vol=0 case, this has the downside that
* unmuting would only take place after processing a buffer.
*/
static void
volume_process_double (GstVolume * this, gpointer bytes, guint n_bytes)
{
gdouble *data = (gdouble *) bytes;
guint i, num_samples = n_bytes / sizeof (gdouble);
for (i = 0; i < num_samples; i++) {
*data++ *= this->real_vol_f;
}
}
static void
volume_process_float (GstVolume * this, gpointer bytes, guint n_bytes)
{
gfloat *data = (gfloat *) bytes;
guint num_samples = n_bytes / sizeof (gfloat);
/*
guint i;
for (i = 0; i < num_samples; i++) {
*data++ *= this->real_vol_f;
}
*/
/* time gst-launch 2>/dev/null audiotestsrc wave=7 num-buffers=10000 ! audio/x-raw-float ! volume volume=1.5 ! fakesink
* goes from 0m0.850s -> 0m0.717s with liboil
*/
oil_scalarmultiply_f32_ns (data, data, &this->real_vol_f, num_samples);
}
static void
volume_process_int32 (GstVolume * this, gpointer bytes, guint n_bytes)
{
gint *data = (gint *) bytes;
guint i, num_samples;
gint64 val;
num_samples = n_bytes / sizeof (gint);
for (i = 0; i < num_samples; i++) {
/* we use bitshifting instead of dividing by UNITY_INT for speed */
val = (gint64) * data;
val = (((gint64) this->real_vol_i32 * val) >> VOLUME_UNITY_INT32_BIT_SHIFT);
*data++ = (gint32) val;
}
}
static void
volume_process_int32_clamp (GstVolume * this, gpointer bytes, guint n_bytes)
{
gint *data = (gint *) bytes;
guint i, num_samples;
gint64 val;
num_samples = n_bytes / sizeof (gint);
for (i = 0; i < num_samples; i++) {
/* we use bitshifting instead of dividing by UNITY_INT for speed */
val = (gint64) * data;
val = (((gint64) this->real_vol_i32 * val) >> VOLUME_UNITY_INT32_BIT_SHIFT);
*data++ = (gint32) CLAMP (val, VOLUME_MIN_INT32, VOLUME_MAX_INT32);
}
}
#if (G_BYTE_ORDER == G_LITTLE_ENDIAN)
#define get_unaligned_i24(_x) ( (((guint8*)_x)[0]) | ((((guint8*)_x)[1]) << 8) | ((((gint8*)_x)[2]) << 16) )
#define write_unaligned_u24(_x,samp) do { *(_x)++ = samp & 0xFF; *(_x)++ = (samp >> 8) & 0xFF; *(_x)++ = (samp >> 16) & 0xFF; } while (0)
#else /* BIG ENDIAN */
#define get_unaligned_i24(_x) ( (((guint8*)_x)[2]) | ((((guint8*)_x)[1]) << 8) | ((((gint8*)_x)[0]) << 16) )
#define write_unaligned_u24(_x,samp) do { *(_x)++ = (samp >> 16) & 0xFF; *(_x)++ = (samp >> 8) & 0xFF; *(_x)++ = samp & 0xFF; } while (0)
#endif
static void
volume_process_int24 (GstVolume * this, gpointer bytes, guint n_bytes)
{
gint8 *data = (gint8 *) bytes; /* treat the data as a byte stream */
guint i, num_samples;
guint32 samp;
gint64 val;
num_samples = n_bytes / (sizeof (gint8) * 3);
for (i = 0; i < num_samples; i++) {
samp = get_unaligned_i24 (data);
val = (gint32) samp;
val = (((gint64) this->real_vol_i24 * val) >> VOLUME_UNITY_INT24_BIT_SHIFT);
samp = (guint32) val;
/* write the value back into the stream */
write_unaligned_u24 (data, samp);
}
}
static void
volume_process_int24_clamp (GstVolume * this, gpointer bytes, guint n_bytes)
{
gint8 *data = (gint8 *) bytes; /* treat the data as a byte stream */
guint i, num_samples;
guint32 samp;
gint64 val;
num_samples = n_bytes / (sizeof (gint8) * 3);
for (i = 0; i < num_samples; i++) {
samp = get_unaligned_i24 (data);
val = (gint32) samp;
val = (((gint64) this->real_vol_i24 * val) >> VOLUME_UNITY_INT24_BIT_SHIFT);
samp = (guint32) CLAMP (val, VOLUME_MIN_INT24, VOLUME_MAX_INT24);
/* write the value back into the stream */
write_unaligned_u24 (data, samp);
}
}
static void
volume_process_int16 (GstVolume * this, gpointer bytes, guint n_bytes)
{
gint16 *data = (gint16 *) bytes;
guint num_samples = n_bytes / sizeof (gint16);
#if 1
guint i;
gint val;
for (i = 0; i < num_samples; i++) {
/* we use bitshifting instead of dividing by UNITY_INT for speed */
val = (gint) * data;
*data++ =
(gint16) ((this->real_vol_i16 * val) >> VOLUME_UNITY_INT16_BIT_SHIFT);
}
#else
/* FIXME: need oil_scalarmultiply_s16_ns ?
* https://bugs.freedesktop.org/show_bug.cgi?id=7060
* code below
* - crashes :/
* - real_vol_i is scaled by VOLUME_UNITY_INT16 and needs the bitshift
* time gst-launch 2>/dev/null audiotestsrc wave=7 num-buffers=100 ! volume volume=1.5 ! fakesink
*/
oil_scalarmult_s16 (data, 0, data, 0,
((gint16 *) (void *) (&this->real_vol_i)), num_samples);
#endif
}
static void
volume_process_int16_clamp (GstVolume * this, gpointer bytes, guint n_bytes)
{
gint16 *data = (gint16 *) bytes;
guint i, num_samples;
gint val;
num_samples = n_bytes / sizeof (gint16);
/* FIXME: oil_scalarmultiply_s16_ns ?
* https://bugs.freedesktop.org/show_bug.cgi?id=7060
*/
for (i = 0; i < num_samples; i++) {
/* we use bitshifting instead of dividing by UNITY_INT for speed */
val = (gint) * data;
*data++ =
(gint16) CLAMP ((this->real_vol_i16 *
val) >> VOLUME_UNITY_INT16_BIT_SHIFT, VOLUME_MIN_INT16,
VOLUME_MAX_INT16);
}
}
static void
volume_process_int8 (GstVolume * this, gpointer bytes, guint n_bytes)
{
gint8 *data = (gint8 *) bytes;
guint num_samples = n_bytes / sizeof (gint8);
guint i;
gint val;
for (i = 0; i < num_samples; i++) {
/* we use bitshifting instead of dividing by UNITY_INT for speed */
val = (gint) * data;
*data++ =
(gint8) ((this->real_vol_i8 * val) >> VOLUME_UNITY_INT8_BIT_SHIFT);
}
}
static void
volume_process_int8_clamp (GstVolume * this, gpointer bytes, guint n_bytes)
{
gint8 *data = (gint8 *) bytes;
guint i, num_samples;
gint val;
num_samples = n_bytes / sizeof (gint8);
for (i = 0; i < num_samples; i++) {
/* we use bitshifting instead of dividing by UNITY_INT for speed */
val = (gint) * data;
*data++ =
(gint8) CLAMP ((this->real_vol_i8 *
val) >> VOLUME_UNITY_INT8_BIT_SHIFT, VOLUME_MIN_INT8,
VOLUME_MAX_INT8);
}
}
/* GstBaseTransform vmethod implementations */
/* get notified of caps and plug in the correct process function */
static gboolean
volume_setup (GstAudioFilter * filter, GstRingBufferSpec * format)
{
GstVolume *this = GST_VOLUME (filter);
if (volume_choose_func (this)) {
return TRUE;
} else {
GST_ELEMENT_ERROR (this, CORE, NEGOTIATION,
("Invalid incoming format"), (NULL));
return FALSE;
}
}
/* call the plugged-in process function for this instance
* needs to be done with this indirection since volume_transform is
* a class-global method
*/
static GstFlowReturn
volume_transform_ip (GstBaseTransform * base, GstBuffer * outbuf)
{
GstVolume *this = GST_VOLUME (base);
GstClockTime timestamp;
/* FIXME: if controllers are bound, subdivide GST_BUFFER_SIZE into small
* chunks for smooth fades, what is small? 1/10th sec.
*/
timestamp = GST_BUFFER_TIMESTAMP (outbuf);
timestamp =
gst_segment_to_stream_time (&base->segment, GST_FORMAT_TIME, timestamp);
GST_DEBUG_OBJECT (base, "sync to %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp));
if (GST_CLOCK_TIME_IS_VALID (timestamp))
gst_object_sync_values (G_OBJECT (this), timestamp);
/* don't process data in passthrough-mode */
if (gst_base_transform_is_passthrough (base) ||
GST_BUFFER_FLAG_IS_SET (outbuf, GST_BUFFER_FLAG_GAP))
return GST_FLOW_OK;
if (this->real_vol_f == 0.0)
this->silent_buffer = TRUE;
this->process (this, GST_BUFFER_DATA (outbuf), GST_BUFFER_SIZE (outbuf));
if (this->silent_buffer)
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_GAP);
this->silent_buffer = FALSE;
return GST_FLOW_OK;
}
static void
volume_update_mute (const GValue * value, gpointer data)
{
GstVolume *this = (GstVolume *) data;
g_return_if_fail (GST_IS_VOLUME (this));
if (G_VALUE_HOLDS_BOOLEAN (value)) {
this->mute = g_value_get_boolean (value);
} else if (G_VALUE_HOLDS_INT (value)) {
this->mute = (g_value_get_int (value) == 1);
}
volume_update_real_volume (this);
}
static void
volume_update_volume (const GValue * value, gpointer data)
{
GstVolume *this = (GstVolume *) data;
g_return_if_fail (GST_IS_VOLUME (this));
this->volume_f = g_value_get_double (value);
this->volume_i8 = this->volume_f * VOLUME_UNITY_INT8;
this->volume_i16 = this->volume_f * VOLUME_UNITY_INT16;
this->volume_i24 = this->volume_f * VOLUME_UNITY_INT24;
this->volume_i32 = this->volume_f * VOLUME_UNITY_INT32;
volume_update_real_volume (this);
}
static void
volume_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstVolume *this = GST_VOLUME (object);
switch (prop_id) {
case PROP_MUTE:
volume_update_mute (value, this);
break;
case PROP_VOLUME:
volume_update_volume (value, this);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
volume_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstVolume *this = GST_VOLUME (object);
switch (prop_id) {
case PROP_MUTE:
g_value_set_boolean (value, this->mute);
break;
case PROP_VOLUME:
g_value_set_double (value, this->volume_f);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
plugin_init (GstPlugin * plugin)
{
#ifndef __SYMBIAN32__
oil_init ();
#endif
/* initialize gst controller library */
gst_controller_init (NULL, NULL);
return gst_element_register (plugin, "volume", GST_RANK_NONE,
GST_TYPE_VOLUME);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"volume",
"plugin for controlling audio volume",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstPluginDesc* _GST_PLUGIN_DESC()
{
return &gst_plugin_desc;
}