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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
- */
- /**
- * @file conversation/microphone.c
- * @brief API to access an audio microphone; provides access to hardware microphones;
- * actually just wraps the gnunet-helper-audio-record
- * @author Simon Dieterle
- * @author Andreas Fuchs
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include "gnunet_microphone_lib.h"
- #include "conversation.h"
- /**
- * Internal data structures for the microphone.
- */
- struct Microphone
- {
- /**
- * Our configuration.
- */
- const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * Handle for the record helper
- */
- struct GNUNET_HELPER_Handle *record_helper;
- /**
- * Function to call with audio data (if we are enabled).
- */
- GNUNET_MICROPHONE_RecordedDataCallback rdc;
- /**
- * Closure for @e rdc.
- */
- void *rdc_cls;
- };
- /**
- * Function to process the audio from the record helper
- *
- * @param cls clsoure with our `struct Microphone`
- * @param msg the message from the helper
- * @return #GNUNET_OK on success,
- * #GNUNET_NO to stop further processing (no error)
- * #GNUNET_SYSERR to stop further processing with error
- */
- static int
- process_record_messages (void *cls,
- const struct GNUNET_MessageHeader *msg)
- {
- struct Microphone *mic = cls;
- const struct AudioMessage *am;
- if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CONVERSATION_AUDIO)
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- am = (const struct AudioMessage *) msg;
- mic->rdc (mic->rdc_cls,
- ntohs (msg->size) - sizeof(struct AudioMessage),
- &am[1]);
- return GNUNET_OK;
- }
- /**
- * Enable a microphone.
- *
- * @param cls clsoure with our `struct Microphone`
- * @param rdc function to call with recorded data
- * @param rdc_cls closure for @a dc
- */
- static int
- enable (void *cls,
- GNUNET_MICROPHONE_RecordedDataCallback rdc,
- void *rdc_cls)
- {
- struct Microphone *mic = cls;
- static char *const record_helper_argv[] = {
- "gnunet-helper-audio-record",
- NULL
- };
- mic->rdc = rdc;
- mic->rdc_cls = rdc_cls;
- mic->record_helper = GNUNET_HELPER_start (GNUNET_NO,
- "gnunet-helper-audio-record",
- record_helper_argv,
- &process_record_messages,
- NULL, mic);
- if (NULL == mic->record_helper)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _ ("Could not start record audio helper\n"));
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
- }
- /**
- * Function that disables a microphone.
- *
- * @param cls clsoure
- */
- static void
- disable (void *cls)
- {
- struct Microphone *mic = cls;
- if (NULL == mic->record_helper)
- {
- GNUNET_break (0);
- return;
- }
- GNUNET_break (GNUNET_OK ==
- GNUNET_HELPER_kill (mic->record_helper, GNUNET_NO));
- GNUNET_HELPER_destroy (mic->record_helper);
- mic->record_helper = NULL;
- }
- /**
- * Function to destroy a microphone.
- *
- * @param cls clsoure
- */
- static void
- destroy (void *cls)
- {
- struct Microphone *mic = cls;
- if (NULL != mic->record_helper)
- disable (mic);
- }
- /**
- * Create a microphone that corresponds to the microphone hardware
- * of our system.
- *
- * @param cfg configuration to use
- * @return NULL on error
- */
- struct GNUNET_MICROPHONE_Handle *
- GNUNET_MICROPHONE_create_from_hardware (const struct
- GNUNET_CONFIGURATION_Handle *cfg)
- {
- struct GNUNET_MICROPHONE_Handle *microphone;
- struct Microphone *mic;
- mic = GNUNET_new (struct Microphone);
- mic->cfg = cfg;
- microphone = GNUNET_new (struct GNUNET_MICROPHONE_Handle);
- microphone->cls = mic;
- microphone->enable_microphone = &enable;
- microphone->disable_microphone = &disable;
- microphone->destroy_microphone = &destroy;
- return microphone;
- }
- /**
- * Destroy a microphone.
- *
- * @param microphone microphone to destroy
- */
- void
- GNUNET_MICROPHONE_destroy (struct GNUNET_MICROPHONE_Handle *microphone)
- {
- microphone->destroy_microphone (microphone->cls);
- GNUNET_free (microphone);
- }
- /* end of microphone.c */
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