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/* Simple Plugin API
* Copyright (C) 2016 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.
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dlfcn.h>
#include <errno.h>
#include <poll.h>
#include <spa/support/log-impl.h>
#include <spa/support/loop.h>
#include <spa/support/plugin.h>
#include <spa/monitor/monitor.h>
#include <spa/debug/dict.h>
#include <spa/debug/pod.h>
static SPA_LOG_IMPL(default_log);
struct data {
struct spa_log *log;
struct spa_loop main_loop;
struct spa_support support[3];
uint32_t n_support;
unsigned int n_sources;
struct spa_source sources[16];
bool rebuild_fds;
struct pollfd fds[16];
unsigned int n_fds;
};
static void inspect_item(struct data *data, struct spa_pod *item)
{
spa_debug_pod(0, spa_type_monitor_item, item);
}
static void on_monitor_event(void *_data, struct spa_event *event)
{
struct data *data = _data;
switch (SPA_MONITOR_EVENT_ID(event)) {
case SPA_MONITOR_EVENT_Added:
fprintf(stderr, "added:\n");
inspect_item(data, SPA_POD_CONTENTS(struct spa_event, event));
break;
case SPA_MONITOR_EVENT_Removed:
fprintf(stderr, "removed:\n");
inspect_item(data, SPA_POD_CONTENTS(struct spa_event, event));
break;
case SPA_MONITOR_EVENT_Changed:
fprintf(stderr, "changed:\n");
inspect_item(data, SPA_POD_CONTENTS(struct spa_event, event));
break;
}
}
static int do_add_source(struct spa_loop *loop, struct spa_source *source)
{
struct data *data = SPA_CONTAINER_OF(loop, struct data, main_loop);
data->sources[data->n_sources] = *source;
data->n_sources++;
data->rebuild_fds = true;
return 0;
}
static int do_update_source(struct spa_source *source)
{
return 0;
}
static void do_remove_source(struct spa_source *source)
{
}
static const struct spa_monitor_callbacks impl_callbacks = {
SPA_VERSION_MONITOR_CALLBACKS,
.event = on_monitor_event,
};
static void handle_monitor(struct data *data, struct spa_monitor *monitor)
{
int res;
uint32_t index;
if (monitor->info)
spa_debug_dict(0, monitor->info);
for (index = 0;;) {
struct spa_pod *item;
uint8_t buffer[4096];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
if ((res = spa_monitor_enum_items(monitor, &index, &item, &b)) <= 0) {
if (res != 0)
printf("spa_monitor_enum_items: %s\n", spa_strerror(res));
break;
}
inspect_item(data, item);
}
spa_monitor_set_callbacks(monitor, &impl_callbacks, data);
while (true) {
int i, r;
/* rebuild */
if (data->rebuild_fds) {
for (i = 0; i < data->n_sources; i++) {
struct spa_source *p = &data->sources[i];
data->fds[i].fd = p->fd;
data->fds[i].events = p->mask;
}
data->n_fds = data->n_sources;
data->rebuild_fds = false;
}
r = poll((struct pollfd *) data->fds, data->n_fds, -1);
if (r < 0) {
if (errno == EINTR)
continue;
break;
}
if (r == 0) {
fprintf(stderr, "monitor %p: select timeout", monitor);
break;
}
/* after */
for (i = 0; i < data->n_sources; i++) {
struct spa_source *p = &data->sources[i];
p->func(p);
}
}
}
int main(int argc, char *argv[])
{
struct data data = { 0 };
int res;
void *handle;
spa_handle_factory_enum_func_t enum_func;
uint32_t fidx;
data.log = &default_log.log;
data.main_loop.version = SPA_VERSION_LOOP;
data.main_loop.add_source = do_add_source;
data.main_loop.update_source = do_update_source;
data.main_loop.remove_source = do_remove_source;
data.support[1] = SPA_SUPPORT_INIT(SPA_ID_INTERFACE_Log, data.log);
data.support[2] = SPA_SUPPORT_INIT(SPA_ID_INTERFACE_MainLoop, &data.main_loop);
data.n_support = 3;
if (argc < 2) {
printf("usage: %s <plugin.so>\n", argv[0]);
return -1;
}
if ((handle = dlopen(argv[1], RTLD_NOW)) == NULL) {
printf("can't load %s\n", argv[1]);
return -1;
}
if ((enum_func = dlsym(handle, SPA_HANDLE_FACTORY_ENUM_FUNC_NAME)) == NULL) {
printf("can't find function\n");
return -1;
}
for (fidx = 0;;) {
const struct spa_handle_factory *factory;
uint32_t iidx;
if ((res = enum_func(&factory, &fidx)) <= 0) {
if (res != 0)
printf("can't enumerate factories: %d\n", res);
break;
}
for (iidx = 0;;) {
const struct spa_interface_info *info;
if ((res =
spa_handle_factory_enum_interface_info(factory, &info, &iidx)) <= 0) {
if (res != 0)
printf("can't enumerate interfaces: %d\n", res);
break;
}
if (info->type == SPA_ID_INTERFACE_Monitor) {
struct spa_handle *handle;
void *interface;
handle = calloc(1, spa_handle_factory_get_size(factory, NULL));
if ((res =
spa_handle_factory_init(factory, handle, NULL, data.support,
data.n_support)) < 0) {
printf("can't make factory instance: %s\n", strerror(res));
continue;
}
if ((res =
spa_handle_get_interface(handle, SPA_ID_INTERFACE_Monitor,
&interface)) < 0) {
printf("can't get interface: %s\n", strerror(res));
continue;
}
handle_monitor(&data, interface);
}
}
}
return 0;
}
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