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/* Simple Plugin API
*
* Copyright © 2018 Wim Taymans
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dlfcn.h>
#include <errno.h>
#include <poll.h>
#include <spa/utils/string.h>
#include <spa/support/log-impl.h>
#include <spa/support/loop.h>
#include <spa/support/plugin.h>
#include <spa/monitor/device.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_info(struct data *data, const struct spa_device_object_info *info)
{
spa_debug_dict(0, info->props);
}
static void on_device_info(void *_data, const struct spa_device_info *info)
{
spa_debug_dict(0, info->props);
}
static void on_device_object_info(void *_data, uint32_t id, const struct spa_device_object_info *info)
{
struct data *data = _data;
if (info == NULL) {
fprintf(stderr, "removed: %u\n", id);
}
else {
fprintf(stderr, "added/changed: %u\n", id);
inspect_info(data, info);
}
}
static int do_add_source(void *object, struct spa_source *source)
{
struct data *data = object;
data->sources[data->n_sources] = *source;
data->n_sources++;
data->rebuild_fds = true;
return 0;
}
static const struct spa_loop_methods impl_loop = {
SPA_VERSION_LOOP_METHODS,
.add_source = do_add_source,
};
static const struct spa_device_events impl_device_events = {
SPA_VERSION_DEVICE_EVENTS,
.info = on_device_info,
.object_info = on_device_object_info,
};
static void handle_device(struct data *data, struct spa_device *device)
{
struct spa_hook listener;
spa_zero(listener);
spa_device_add_listener(device, &listener, &impl_device_events, data);
while (true) {
int r;
uint32_t i;
/* 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, "device %p: select timeout", device);
break;
}
/* after */
for (i = 0; i < data->n_sources; i++) {
struct spa_source *p = &data->sources[i];
p->func(p);
}
}
spa_hook_remove(&listener);
}
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.iface = SPA_INTERFACE_INIT(
SPA_TYPE_INTERFACE_Loop,
SPA_VERSION_LOOP,
&impl_loop, &data);
data.support[0] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_Log, data.log);
data.support[1] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_Loop, &data.main_loop);
data.n_support = 2;
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;
}
if (factory->version < 1) {
printf("factories version %d < %d not supported\n",
factory->version, 1);
continue;
}
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 (spa_streq(info->type, SPA_TYPE_INTERFACE_Device)) {
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_TYPE_INTERFACE_Device,
&interface)) < 0) {
printf("can't get interface: %s\n", strerror(res));
continue;
}
handle_device(&data, interface);
}
}
}
return 0;
}
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