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pipewire/pinos/modules/spa/spa-v4l2-monitor.c
Wim Taymans 6497c82a7d Use v4l2 monitor 
Use the v4l2 monitor to dynamically add and remove nodes.
Use the info from the monitor as parameter for the factory init and use
it to configure the new node.
Add info to the node.
Use info from the factory as properties on the PinosNode
2016-09-15 17:51:34 +02:00

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/* Pinos
* Copyright (C) 2015 Wim Taymans <wim.taymans@gmail.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#define _GNU_SOURCE
#include <dlfcn.h>
#include <errno.h>
#include <poll.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <gio/gio.h>
#include <spa/include/spa/node.h>
#include <spa/include/spa/monitor.h>
#include "spa-v4l2-monitor.h"
#define PINOS_SPA_V4L2_MONITOR_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), PINOS_TYPE_SPA_V4L2_MONITOR, PinosSpaV4l2MonitorPrivate))
struct _PinosSpaV4l2MonitorPrivate
{
PinosDaemon *daemon;
SpaHandle *handle;
SpaMonitor *monitor;
GSource *watch_source;
unsigned int n_poll;
SpaPollItem poll[16];
GHashTable *nodes;
};
enum
{
PROP_0,
PROP_DAEMON,
PROP_MONITOR,
};
G_DEFINE_TYPE (PinosSpaV4l2Monitor, pinos_spa_v4l2_monitor, G_TYPE_OBJECT);
static SpaResult
make_handle (SpaHandle **handle, const char *lib, const char *name, const SpaDict *info)
{
SpaResult res;
void *hnd, *state = NULL;
SpaEnumHandleFactoryFunc enum_func;
if ((hnd = dlopen (lib, RTLD_NOW)) == NULL) {
g_error ("can't load %s: %s", lib, dlerror());
return SPA_RESULT_ERROR;
}
if ((enum_func = dlsym (hnd, "spa_enum_handle_factory")) == NULL) {
g_error ("can't find enum function");
return SPA_RESULT_ERROR;
}
while (true) {
const SpaHandleFactory *factory;
if ((res = enum_func (&factory, &state)) < 0) {
if (res != SPA_RESULT_ENUM_END)
g_error ("can't enumerate factories: %d", res);
break;
}
if (strcmp (factory->name, name))
continue;
*handle = g_malloc0 (factory->size);
if ((res = spa_handle_factory_init (factory, *handle, info)) < 0) {
g_error ("can't make factory instance: %d", res);
return res;
}
return SPA_RESULT_OK;
}
return SPA_RESULT_ERROR;
}
static void
add_item (PinosSpaV4l2Monitor *this, SpaMonitorItem *item)
{
PinosSpaV4l2MonitorPrivate *priv = this->priv;
SpaResult res;
SpaHandle *handle;
PinosNode *node;
void *iface;
PinosProperties *props = NULL;
g_debug ("v4l2-monitor %p: add: \"%s\" (%s)", this, item->name, item->id);
handle = calloc (1, item->factory->size);
if ((res = spa_handle_factory_init (item->factory, handle, item->info)) < 0) {
g_error ("can't make factory instance: %d", res);
return;
}
if ((res = spa_handle_get_interface (handle, SPA_INTERFACE_ID_NODE, &iface)) < 0) {
g_error ("can't get MONITOR interface: %d", res);
return;
}
if (item->info) {
unsigned int i;
props = pinos_properties_new (NULL, NULL);
for (i = 0; i < item->info->n_items; i++)
pinos_properties_set (props,
item->info->items[i].key,
item->info->items[i].value);
}
node = g_object_new (PINOS_TYPE_NODE,
"daemon", priv->daemon,
"name", item->factory->name,
"node", iface,
"properties", props,
NULL);
g_hash_table_insert (priv->nodes, g_strdup (item->id), node);
}
static void
remove_item (PinosSpaV4l2Monitor *this, SpaMonitorItem *item)
{
PinosSpaV4l2MonitorPrivate *priv = this->priv;
PinosNode *node;
g_debug ("v4l2-monitor %p: remove: \"%s\" (%s)", this, item->name, item->id);
node = g_hash_table_lookup (priv->nodes, item->id);
if (node) {
pinos_node_remove (node);
g_hash_table_remove (priv->nodes, item->id);
}
}
static gboolean
poll_event (GIOChannel *source,
GIOCondition condition,
gpointer user_data)
{
PinosSpaV4l2Monitor *this = user_data;
PinosSpaV4l2MonitorPrivate *priv = this->priv;
SpaPollNotifyData data;
data.user_data = priv->poll[0].user_data;
data.fds = priv->poll[0].fds;
data.n_fds = priv->poll[0].n_fds;
priv->poll[0].after_cb (&data);
return TRUE;
}
static void
on_monitor_event (SpaMonitor *monitor,
SpaMonitorEvent *event,
void *user_data)
{
PinosSpaV4l2Monitor *this = user_data;
PinosSpaV4l2MonitorPrivate *priv = this->priv;
switch (event->type) {
case SPA_MONITOR_EVENT_TYPE_ADDED:
{
SpaMonitorItem *item = event->data;
add_item (this, item);
break;
}
case SPA_MONITOR_EVENT_TYPE_REMOVED:
{
SpaMonitorItem *item = event->data;
remove_item (this, item);
}
case SPA_MONITOR_EVENT_TYPE_CHANGED:
{
SpaMonitorItem *item = event->data;
g_debug ("v4l2-monitor %p: changed: \"%s\"", this, item->name);
break;
}
case SPA_MONITOR_EVENT_TYPE_ADD_POLL:
{
SpaPollItem *item = event->data;
GIOChannel *channel;
priv->poll[priv->n_poll] = *item;
priv->n_poll++;
channel = g_io_channel_unix_new (item->fds[0].fd);
priv->watch_source = g_io_create_watch (channel, G_IO_IN);
g_io_channel_unref (channel);
g_source_set_callback (priv->watch_source, (GSourceFunc) poll_event, this, NULL);
g_source_attach (priv->watch_source, g_main_context_get_thread_default ());
g_source_unref (priv->watch_source);
break;
}
case SPA_MONITOR_EVENT_TYPE_UPDATE_POLL:
break;
case SPA_MONITOR_EVENT_TYPE_REMOVE_POLL:
{
priv->n_poll--;
g_source_destroy (priv->watch_source);
priv->watch_source = NULL;
break;
}
default:
break;
}
}
static void
monitor_constructed (GObject * object)
{
PinosSpaV4l2Monitor *this = PINOS_SPA_V4L2_MONITOR (object);
PinosSpaV4l2MonitorPrivate *priv = this->priv;
SpaResult res;
void *state = NULL;
g_debug ("spa-monitor %p: constructed", this);
G_OBJECT_CLASS (pinos_spa_v4l2_monitor_parent_class)->constructed (object);
while (TRUE) {
SpaMonitorItem *item;
if ((res = spa_monitor_enum_items (priv->monitor, &item, &state)) < 0) {
if (res != SPA_RESULT_ENUM_END)
g_debug ("spa_monitor_enum_items: got error %d\n", res);
break;
}
add_item (this, item);
}
spa_monitor_set_event_callback (priv->monitor, on_monitor_event, this);
}
static void
monitor_get_property (GObject *_object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
PinosSpaV4l2Monitor *this = PINOS_SPA_V4L2_MONITOR (_object);
PinosSpaV4l2MonitorPrivate *priv = this->priv;
switch (prop_id) {
case PROP_DAEMON:
g_value_set_object (value, priv->daemon);
break;
case PROP_MONITOR:
g_value_set_pointer (value, priv->monitor);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (this, prop_id, pspec);
break;
}
}
static void
monitor_set_property (GObject *_object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
PinosSpaV4l2Monitor *this = PINOS_SPA_V4L2_MONITOR (_object);
PinosSpaV4l2MonitorPrivate *priv = this->priv;
switch (prop_id) {
case PROP_DAEMON:
priv->daemon = g_value_dup_object (value);
break;
case PROP_MONITOR:
priv->monitor = g_value_get_pointer (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (this, prop_id, pspec);
break;
}
}
static void
monitor_finalize (GObject * object)
{
PinosSpaV4l2Monitor *this = PINOS_SPA_V4L2_MONITOR (object);
PinosSpaV4l2MonitorPrivate *priv = this->priv;
g_debug ("spa-monitor %p: dispose", this);
spa_handle_clear (priv->handle);
g_free (priv->handle);
g_hash_table_unref (priv->nodes);
G_OBJECT_CLASS (pinos_spa_v4l2_monitor_parent_class)->finalize (object);
}
static void
pinos_spa_v4l2_monitor_class_init (PinosSpaV4l2MonitorClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (PinosSpaV4l2MonitorPrivate));
gobject_class->constructed = monitor_constructed;
gobject_class->finalize = monitor_finalize;
gobject_class->set_property = monitor_set_property;
gobject_class->get_property = monitor_get_property;
g_object_class_install_property (gobject_class,
PROP_DAEMON,
g_param_spec_object ("daemon",
"Daemon",
"The Daemon",
PINOS_TYPE_DAEMON,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_MONITOR,
g_param_spec_pointer ("monitor",
"Monitor",
"The SPA monitor",
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
}
static void
pinos_spa_v4l2_monitor_init (PinosSpaV4l2Monitor * this)
{
PinosSpaV4l2MonitorPrivate *priv = this->priv = PINOS_SPA_V4L2_MONITOR_GET_PRIVATE (this);
priv->nodes = g_hash_table_new_full (g_str_hash,
g_str_equal,
g_free,
g_object_unref);
}
GObject *
pinos_spa_v4l2_monitor_new (PinosDaemon *daemon)
{
GObject *monitor;
SpaHandle *handle;
SpaResult res;
void *iface;
if ((res = make_handle (&handle,
"spa/build/plugins/v4l2/libspa-v4l2.so",
"v4l2-monitor",
NULL)) < 0) {
g_error ("can't create v4l2-monitor: %d", res);
return NULL;
}
if ((res = spa_handle_get_interface (handle, SPA_INTERFACE_ID_MONITOR, &iface)) < 0) {
g_free (handle);
g_error ("can't get MONITOR interface: %d", res);
return NULL;
}
monitor = g_object_new (PINOS_TYPE_SPA_V4L2_MONITOR,
"daemon", daemon,
"monitor", iface,
NULL);
return monitor;
}
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