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/*
* Copyright (C) 2014 Michal Ratajsky <michal.ratajsky@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the licence, 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <glib.h>
#include <glib/gi18n.h>
#include <glib-object.h>
#include <pulse/pulseaudio.h>
#include "pulse-monitor.h"
struct _PulseMonitorPrivate
{
pa_context *context;
pa_proplist *proplist;
pa_stream *stream;
guint32 index_source;
guint32 index_sink_input;
gboolean enabled;
};
enum {
PROP_0,
PROP_ENABLED,
PROP_INDEX_SOURCE,
PROP_INDEX_SINK_INPUT,
N_PROPERTIES
};
static GParamSpec *properties[N_PROPERTIES] = { NULL, };
enum {
VALUE,
N_SIGNALS
};
static guint signals[N_SIGNALS] = { 0, };
static void pulse_monitor_class_init (PulseMonitorClass *klass);
static void pulse_monitor_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec);
static void pulse_monitor_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec);
static void pulse_monitor_init (PulseMonitor *monitor);
static void pulse_monitor_finalize (GObject *object);
G_DEFINE_TYPE_WITH_PRIVATE (PulseMonitor, pulse_monitor, G_TYPE_OBJECT);
static gboolean stream_connect (PulseMonitor *monitor);
static void stream_read_cb (pa_stream *stream,
size_t length,
void *userdata);
static void
pulse_monitor_class_init (PulseMonitorClass *klass)
{
GObjectClass *object_class;
object_class = G_OBJECT_CLASS (klass);
object_class->finalize = pulse_monitor_finalize;
object_class->get_property = pulse_monitor_get_property;
object_class->set_property = pulse_monitor_set_property;
properties[PROP_ENABLED] =
g_param_spec_boolean ("enabled",
"Enabled",
"Monitor enabled",
FALSE,
G_PARAM_READABLE |
G_PARAM_STATIC_STRINGS);
properties[PROP_INDEX_SOURCE] =
g_param_spec_uint ("index-source",
"Index of source",
"Index of the PulseAudio source",
0,
G_MAXUINT,
0,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS);
properties[PROP_INDEX_SINK_INPUT] =
g_param_spec_uint ("index-sink-input",
"Index of sink input",
"Index of the PulseAudio sink input",
0,
G_MAXUINT,
0,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (object_class, N_PROPERTIES, properties);
signals[VALUE] =
g_signal_new ("value",
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (PulseMonitorClass, value),
NULL,
NULL,
g_cclosure_marshal_VOID__DOUBLE,
G_TYPE_NONE,
1,
G_TYPE_DOUBLE);
}
static void
pulse_monitor_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec)
{
PulseMonitor *monitor;
monitor = PULSE_MONITOR (object);
switch (param_id) {
case PROP_ENABLED:
g_value_set_boolean (value, monitor->priv->enabled);
break;
case PROP_INDEX_SOURCE:
g_value_set_uint (value, monitor->priv->index_source);
break;
case PROP_INDEX_SINK_INPUT:
g_value_set_uint (value, monitor->priv->index_sink_input);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
break;
}
}
static void
pulse_monitor_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec)
{
PulseMonitor *monitor;
monitor = PULSE_MONITOR (object);
switch (param_id) {
case PROP_INDEX_SOURCE:
monitor->priv->index_source = g_value_get_uint (value);
break;
case PROP_INDEX_SINK_INPUT:
monitor->priv->index_sink_input = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
break;
}
}
static void
pulse_monitor_init (PulseMonitor *monitor)
{
monitor->priv = pulse_monitor_get_instance_private (monitor);
}
static void
pulse_monitor_finalize (GObject *object)
{
PulseMonitor *monitor;
monitor = PULSE_MONITOR (object);
/* The pulse stream may exist if the monitor is running */
if (monitor->priv->stream != NULL) {
pa_stream_disconnect (monitor->priv->stream);
pa_stream_unref (monitor->priv->stream);
}
pa_context_unref (monitor->priv->context);
pa_proplist_free (monitor->priv->proplist);
G_OBJECT_CLASS (pulse_monitor_parent_class)->finalize (object);
}
PulseMonitor *
pulse_monitor_new (pa_context *context,
pa_proplist *proplist,
guint32 index_source,
guint32 index_sink_input)
{
PulseMonitor *monitor;
g_return_val_if_fail (context != NULL, NULL);
g_return_val_if_fail (proplist != NULL, NULL);
monitor = g_object_new (PULSE_TYPE_MONITOR,
"index-source", index_source,
"index-sink-input", index_sink_input,
NULL);
monitor->priv->context = pa_context_ref (context);
monitor->priv->proplist = pa_proplist_copy (proplist);
return monitor;
}
gboolean
pulse_monitor_get_enabled (PulseMonitor *monitor)
{
g_return_val_if_fail (PULSE_IS_MONITOR (monitor), FALSE);
return monitor->priv->enabled;
}
gboolean
pulse_monitor_set_enabled (PulseMonitor *monitor, gboolean enabled)
{
g_return_val_if_fail (PULSE_IS_MONITOR (monitor), FALSE);
if (enabled == monitor->priv->enabled)
return TRUE;
if (enabled) {
monitor->priv->enabled = stream_connect (monitor);
if (monitor->priv->enabled == FALSE)
return FALSE;
} else {
pa_stream_disconnect (monitor->priv->stream);
pa_stream_unref (monitor->priv->stream);
monitor->priv->stream = NULL;
monitor->priv->enabled = FALSE;
}
g_object_notify_by_pspec (G_OBJECT (monitor), properties[PROP_ENABLED]);
return TRUE;
}
static gboolean
stream_connect (PulseMonitor *monitor)
{
pa_sample_spec spec;
pa_buffer_attr attr;
gchar *idx;
int ret;
attr.maxlength = (guint32) -1;
attr.tlength = 0;
attr.prebuf = 0;
attr.minreq = 0;
attr.fragsize = sizeof (gfloat);
spec.channels = 1;
spec.format = PA_SAMPLE_FLOAT32;
spec.rate = 25;
monitor->priv->stream =
pa_stream_new_with_proplist (monitor->priv->context,
_("Peak detect"),
&spec,
NULL,
monitor->priv->proplist);
if (G_UNLIKELY (monitor->priv->stream == NULL)) {
g_warning ("Failed to create peak monitor: %s",
pa_strerror (pa_context_errno (monitor->priv->context)));
return FALSE;
}
/* Set sink input index for the stream, source outputs are not supported */
if (monitor->priv->index_sink_input != PA_INVALID_INDEX)
pa_stream_set_monitor_stream (monitor->priv->stream,
monitor->priv->index_sink_input);
pa_stream_set_read_callback (monitor->priv->stream,
stream_read_cb,
monitor);
/* Source index must be passed as a string */
idx = g_strdup_printf ("%u", monitor->priv->index_source);
ret = pa_stream_connect_record (monitor->priv->stream,
idx,
&attr,
PA_STREAM_DONT_MOVE |
PA_STREAM_PEAK_DETECT |
PA_STREAM_ADJUST_LATENCY);
g_free (idx);
if (ret < 0) {
g_warning ("Failed to connect peak monitor: %s", pa_strerror (ret));
return FALSE;
}
return TRUE;
}
static void
stream_read_cb (pa_stream *stream, size_t length, void *userdata)
{
const void *data;
/* Read the next fragment from the buffer (for recording streams).
*
* If there is data at the current read index, data will point to the
* actual data and length will contain the size of the data in bytes
* (which can be less or more than a complete fragment).
*
* If there is no data at the current read index, it means that either
* the buffer is empty or it contains a hole (that is, the write index
* is ahead of the read index but there's no data where the read index
* points at). If the buffer is empty, data will be NULL and length will
* be 0. If there is a hole, data will be NULL and length will contain
* the length of the hole. */
if (pa_stream_peek (stream, &data, &length) < 0)
return;
if (data != NULL) {
gdouble v = ((const gfloat *) data)[length / sizeof (gfloat) - 1];
g_signal_emit (G_OBJECT (userdata),
signals[VALUE],
0,
CLAMP (v, 0, 1));
}
/* pa_stream_drop() should not be called if the buffer is empty, but it
* should be called if there is a hole */
if (length > 0)
pa_stream_drop (stream);
}
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