1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup RTEMSMedia |
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5 | * |
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6 | * @brief Media implementation. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2009, 2010 embedded brains GmbH. All rights reserved. |
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11 | * |
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12 | * embedded brains GmbH |
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13 | * Obere Lagerstr. 30 |
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14 | * 82178 Puchheim |
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15 | * Germany |
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16 | * <rtems@embedded-brains.de> |
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17 | * |
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18 | * The license and distribution terms for this file may be |
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19 | * found in the file LICENSE in this distribution or at |
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20 | * http://www.rtems.org/license/LICENSE. |
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21 | */ |
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22 | |
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23 | #include <string.h> |
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24 | #include <stdlib.h> |
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25 | #include <assert.h> |
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26 | |
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27 | #include <rtems.h> |
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28 | #include <rtems/chain.h> |
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29 | #include <rtems/media.h> |
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30 | |
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31 | #define EVENT RTEMS_EVENT_13 |
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32 | |
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33 | typedef struct { |
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34 | rtems_chain_node node; |
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35 | rtems_media_event event; |
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36 | const char *src; |
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37 | rtems_media_worker worker; |
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38 | void *worker_arg; |
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39 | } message; |
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40 | |
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41 | static RTEMS_CHAIN_DEFINE_EMPTY(message_chain); |
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42 | |
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43 | static rtems_id server_id = RTEMS_ID_NONE; |
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44 | |
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45 | static void media_server(rtems_task_argument arg __attribute__((unused))) |
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46 | { |
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47 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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48 | |
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49 | while (true) { |
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50 | message *msg = NULL; |
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51 | |
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52 | sc = rtems_chain_get_with_wait( |
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53 | &message_chain, |
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54 | EVENT, |
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55 | RTEMS_NO_TIMEOUT, |
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56 | (rtems_chain_node **) &msg |
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57 | ); |
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58 | assert(sc == RTEMS_SUCCESSFUL); |
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59 | assert(msg != NULL); |
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60 | |
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61 | rtems_media_post_event( |
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62 | msg->event, |
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63 | msg->src, |
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64 | NULL, |
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65 | msg->worker, |
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66 | msg->worker_arg |
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67 | ); |
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68 | |
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69 | free(msg); |
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70 | } |
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71 | } |
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72 | |
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73 | rtems_status_code rtems_media_server_initialize( |
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74 | rtems_task_priority priority, |
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75 | size_t stack_size, |
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76 | rtems_mode modes, |
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77 | rtems_attribute attributes |
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78 | ) |
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79 | { |
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80 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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81 | |
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82 | if (server_id == RTEMS_ID_NONE) { |
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83 | sc = rtems_media_initialize(); |
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84 | if (sc != RTEMS_SUCCESSFUL) { |
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85 | goto error; |
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86 | } |
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87 | |
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88 | sc = rtems_task_create( |
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89 | rtems_build_name('M', 'D', 'I', 'A'), |
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90 | priority, |
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91 | stack_size, |
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92 | modes, |
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93 | attributes, |
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94 | &server_id |
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95 | ); |
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96 | if (sc != RTEMS_SUCCESSFUL) { |
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97 | goto error; |
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98 | } |
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99 | |
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100 | sc = rtems_task_start(server_id, media_server, 0); |
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101 | if (sc != RTEMS_SUCCESSFUL) { |
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102 | goto error; |
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103 | } |
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104 | } |
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105 | |
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106 | return RTEMS_SUCCESSFUL; |
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107 | |
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108 | error: |
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109 | |
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110 | if (server_id != RTEMS_ID_NONE) { |
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111 | rtems_task_delete(server_id); |
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112 | } |
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113 | |
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114 | return RTEMS_NO_MEMORY; |
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115 | } |
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116 | |
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117 | rtems_status_code rtems_media_server_post_event( |
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118 | rtems_media_event event, |
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119 | const char *src, |
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120 | rtems_media_worker worker, |
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121 | void *worker_arg |
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122 | ) |
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123 | { |
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124 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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125 | size_t src_size = strlen(src) + 1; |
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126 | message *msg = malloc(sizeof(*msg) + src_size); |
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127 | |
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128 | if (msg != NULL) { |
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129 | char *s = (char *) msg + sizeof(*msg); |
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130 | |
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131 | memcpy(s, src, src_size); |
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132 | |
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133 | msg->event = event; |
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134 | msg->src = s; |
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135 | msg->worker = worker; |
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136 | msg->worker_arg = worker_arg; |
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137 | |
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138 | sc = rtems_chain_append_with_notification( |
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139 | &message_chain, |
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140 | &msg->node, |
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141 | server_id, |
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142 | EVENT |
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143 | ); |
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144 | if (sc != RTEMS_SUCCESSFUL) { |
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145 | sc = RTEMS_NOT_CONFIGURED; |
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146 | } |
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147 | } else { |
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148 | sc = RTEMS_NO_MEMORY; |
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149 | } |
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150 | |
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151 | return sc; |
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152 | } |
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