pipewire/pinos/modules/spa/spa-node.c

/* 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.
 */

#include <string.h>
#include <stdio.h>
#include <dlfcn.h>

#include <spa/include/spa/node.h>

#include "spa-node.h"

typedef struct {
  PinosSpaNode this;
  PinosCore *core;

  void *hnd;
} PinosSpaNodeImpl;

PinosSpaNode *
pinos_spa_node_load (PinosCore  *core,
                     const char *lib,
                     const char *factory_name,
                     const char *name,
                     PinosProperties *properties,
                     SetupNode setup_func)
{
  PinosSpaNode *this;
  PinosSpaNodeImpl *impl;
  SpaNode *spa_node;
  SpaClock *spa_clock;
  SpaResult res;
  SpaHandle *handle;
  void *hnd;
  uint32_t index;
  SpaEnumHandleFactoryFunc enum_func;
  const SpaHandleFactory *factory;
  void *iface;

  if ((hnd = dlopen (lib, RTLD_NOW)) == NULL) {
    pinos_log_error ("can't load %s: %s", lib, dlerror());
    return NULL;
  }
  if ((enum_func = dlsym (hnd, "spa_enum_handle_factory")) == NULL) {
    pinos_log_error ("can't find enum function");
    goto no_symbol;
  }

  for (index = 0; ; index++) {
    if ((res = enum_func (&factory, index)) < 0) {
      if (res != SPA_RESULT_ENUM_END)
        pinos_log_error ("can't enumerate factories: %d", res);
      goto enum_failed;
    }
    if (strcmp (factory->name, factory_name) == 0)
      break;
  }

  handle = calloc (1, factory->size);
  if ((res = spa_handle_factory_init (factory,
                                      handle,
                                      NULL,
                                      core->support,
                                      core->n_support)) < 0) {
    pinos_log_error ("can't make factory instance: %d", res);
    goto init_failed;
  }
  if ((res = spa_handle_get_interface (handle,
                                       core->uri.spa_node,
                                       &iface)) < 0) {
    pinos_log_error ("can't get interface %d", res);
    goto interface_failed;
  }
  spa_node = iface;

  if ((res = spa_handle_get_interface (handle,
                                       core->uri.spa_clock,
                                       &iface)) < 0) {
    iface = NULL;
  }
  spa_clock = iface;

  impl = calloc (1, sizeof (PinosSpaNodeImpl));
  impl->core = core;
  impl->hnd = hnd;
  this = &impl->this;

  if (setup_func != NULL) {
    if (setup_func (spa_node, properties) != SPA_RESULT_OK) {
      pinos_log_debug ("Unrecognized properties");
    }
  }

  this->node = pinos_node_new (core,
                               name,
                               spa_node,
                               spa_clock,
                               properties);
  this->lib = strdup (lib);
  this->factory_name = strdup (factory_name);
  this->handle = handle;

  return this;

interface_failed:
  spa_handle_clear (handle);
init_failed:
  free (handle);
enum_failed:
no_symbol:
  dlclose (hnd);
  return NULL;
}

void
pinos_spa_node_destroy (PinosSpaNode * node)
{
  PinosSpaNodeImpl *impl = SPA_CONTAINER_OF (node, PinosSpaNodeImpl, this);

  pinos_log_debug ("spa-node %p: destroy", impl);
  pinos_signal_emit (&node->destroy_signal, node);

  pinos_node_destroy (node->node);

  spa_handle_clear (node->handle);
  free (node->handle);
  free (node->lib);
  free (node->factory_name);
  dlclose (impl->hnd);
  free (impl);
}