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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSMedia
*
* @brief Media implementation.
*/
/*
* Copyright (C) 2009, 2010 embedded brains GmbH & Co. KG
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <rtems.h>
#include <rtems/chain.h>
#include <rtems/media.h>
#define EVENT RTEMS_EVENT_13
typedef struct {
rtems_chain_node node;
rtems_media_event event;
const char *src;
rtems_media_worker worker;
void *worker_arg;
} message;
static RTEMS_CHAIN_DEFINE_EMPTY(message_chain);
static rtems_id server_id = RTEMS_ID_NONE;
static void media_server(rtems_task_argument arg RTEMS_UNUSED)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
while (true) {
message *msg = NULL;
sc = rtems_chain_get_with_wait(
&message_chain,
EVENT,
RTEMS_NO_TIMEOUT,
(rtems_chain_node **) &msg
);
assert(sc == RTEMS_SUCCESSFUL);
assert(msg != NULL);
rtems_media_post_event(
msg->event,
msg->src,
NULL,
msg->worker,
msg->worker_arg
);
free(msg);
}
}
rtems_status_code rtems_media_server_initialize(
rtems_task_priority priority,
size_t stack_size,
rtems_mode modes,
rtems_attribute attributes
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
if (server_id == RTEMS_ID_NONE) {
sc = rtems_media_initialize();
if (sc != RTEMS_SUCCESSFUL) {
goto error;
}
sc = rtems_task_create(
rtems_build_name('M', 'D', 'I', 'A'),
priority,
stack_size,
modes,
attributes,
&server_id
);
if (sc != RTEMS_SUCCESSFUL) {
goto error;
}
sc = rtems_task_start(server_id, media_server, 0);
if (sc != RTEMS_SUCCESSFUL) {
goto error;
}
}
return RTEMS_SUCCESSFUL;
error:
if (server_id != RTEMS_ID_NONE) {
rtems_task_delete(server_id);
}
return RTEMS_NO_MEMORY;
}
rtems_status_code rtems_media_server_post_event(
rtems_media_event event,
const char *src,
rtems_media_worker worker,
void *worker_arg
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
size_t src_size = strlen(src) + 1;
message *msg = malloc(sizeof(*msg) + src_size);
if (msg != NULL) {
char *s = (char *) msg + sizeof(*msg);
memcpy(s, src, src_size);
msg->event = event;
msg->src = s;
msg->worker = worker;
msg->worker_arg = worker_arg;
rtems_chain_initialize_node(&msg->node);
sc = rtems_chain_append_with_notification(
&message_chain,
&msg->node,
server_id,
EVENT
);
if (sc != RTEMS_SUCCESSFUL) {
sc = RTEMS_NOT_CONFIGURED;
}
} else {
sc = RTEMS_NO_MEMORY;
}
return sc;
}
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