speaker.c

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/*
   This file is part of GNUnet
   Copyright (C) 2013 GNUnet e.V.
 
   GNUnet is free software: you can redistribute it and/or modify it
   under the terms of the GNU Affero General Public License as published
   by the Free Software Foundation, either version 3 of the License,
   or (at your option) any later version.
 
   GNUnet 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
   Affero General Public License for more details.
 
   You should have received a copy of the GNU Affero General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
     SPDX-License-Identifier: AGPL3.0-or-later
 */
 
#include "platform.h"
#include "gnunet_speaker_lib.h"
#include "conversation.h"
 
 
struct Speaker
{
  const struct GNUNET_CONFIGURATION_Handle *cfg;
 
  struct GNUNET_HELPER_Handle *playback_helper;
};
 
 
static int
enable (void *cls)
{
  struct Speaker *spe = cls;
  static char *playback_helper_argv[] = {
    "gnunet-helper-audio-playback",
    NULL
  };
 
  spe->playback_helper = GNUNET_HELPER_start (GNUNET_NO,
                                              "gnunet-helper-audio-playback",
                                              playback_helper_argv,
                                              NULL,
                                              NULL, spe);
  if (NULL == spe->playback_helper)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _ ("Could not start playback audio helper.\n"));
    return GNUNET_SYSERR;
  }
  return GNUNET_OK;
}
 
 
static void
disable (void *cls)
{
  struct Speaker *spe = cls;
 
  if (NULL == spe->playback_helper)
  {
    GNUNET_break (0);
    return;
  }
  GNUNET_break (GNUNET_OK ==
                GNUNET_HELPER_kill (spe->playback_helper, GNUNET_NO));
  GNUNET_HELPER_destroy (spe->playback_helper);
  spe->playback_helper = NULL;
}
 
 
static void
destroy (void *cls)
{
  struct Speaker *spe = cls;
 
  if (NULL != spe->playback_helper)
    disable (spe);
}
 
 
static void
play (void *cls,
      size_t data_size,
      const void *data)
{
  struct Speaker *spe = cls;
  char buf[sizeof(struct AudioMessage) + data_size];
  struct AudioMessage *am;
 
  if (NULL == spe->playback_helper)
  {
    GNUNET_break (0);
    return;
  }
  am = (struct AudioMessage *) buf;
  am->header.size = htons (sizeof(struct AudioMessage) + data_size);
  am->header.type = htons (GNUNET_MESSAGE_TYPE_CONVERSATION_AUDIO);
  GNUNET_memcpy (&am[1], data, data_size);
  (void) GNUNET_HELPER_send (spe->playback_helper,
                             &am->header,
                             GNUNET_NO,
                             NULL, NULL);
}
 
 
struct GNUNET_SPEAKER_Handle *
GNUNET_SPEAKER_create_from_hardware (const struct
                                     GNUNET_CONFIGURATION_Handle *cfg)
{
  struct GNUNET_SPEAKER_Handle *speaker;
  struct Speaker *spe;
 
  spe = GNUNET_new (struct Speaker);
  spe->cfg = cfg;
  speaker = GNUNET_new (struct GNUNET_SPEAKER_Handle);
  speaker->cls = spe;
  speaker->enable_speaker = &enable;
  speaker->play = &play;
  speaker->disable_speaker = &disable;
  speaker->destroy_speaker = &destroy;
  return speaker;
}
 
 
void
GNUNET_SPEAKER_destroy (struct GNUNET_SPEAKER_Handle *speaker)
{
  speaker->destroy_speaker (speaker->cls);
  GNUNET_free (speaker);
}
 
 
/* end of speaker.c */