f9560d7f1ee1050439f16459a6fda786647d9250
2 * Copyright (C) 2006-2008 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file write_common.c common functions of para_audiod and para_write */
16 /** the array containing the names of all supported writers */
17 const char *writer_names
[] ={WRITER_NAMES
};
19 /** the array of supported writers */
20 struct writer writers
[NUM_SUPPORTED_WRITERS
] = {WRITER_ARRAY
};
22 static void wng_pre_select(__a_unused
struct sched
*s
, struct task
*t
)
24 struct writer_node_group
*g
= container_of(t
, struct writer_node_group
, task
);
27 FOR_EACH_WRITER_NODE(i
, g
) {
28 struct writer_node
*wn
= &g
->writer_nodes
[i
];
29 t
->error
= wn
->writer
->pre_select(s
, wn
);
35 static void wng_post_select(struct sched
*s
, struct task
*t
)
37 struct writer_node_group
*g
= container_of(t
, struct writer_node_group
, task
);
39 size_t min_written
= 0;
41 FOR_EACH_WRITER_NODE(i
, g
) {
42 struct writer_node
*wn
= &g
->writer_nodes
[i
];
43 t
->error
= wn
->writer
->post_select(s
, wn
);
47 min_written
= wn
->written
;
49 min_written
= PARA_MIN(min_written
, wn
->written
);
51 //PARA_INFO_LOG("loaded: %zd, min_written: %zd bytes\n", *g->loaded, min_written);
53 *g
->loaded
-= min_written
;
54 FOR_EACH_WRITER_NODE(i
, g
)
55 g
->writer_nodes
[i
].written
-= min_written
;
57 if (!*g
->loaded
&& *g
->input_error
) {
58 t
->error
= *g
->input_error
;
61 if (*g
->loaded
&& min_written
) {
62 // PARA_INFO_LOG("moving %zd bytes\n", *g->loaded);
63 memmove(g
->buf
, g
->buf
+ min_written
, *g
->loaded
);
68 * call the open function of each writer in the group
70 * \param g the writer node group
72 * \return If at least one open function returned an error, all successful
73 * writer notes get closed and this error value is returned. Upon success, a
74 * task associated with \a g is registered to the scheduler and the function
75 * returns a positive value.
77 int wng_open(struct writer_node_group
*g
)
81 PARA_NOTICE_LOG("opening wng %p with %d writer(s)\n", g
, g
->num_writers
);
82 register_task(&g
->task
);
83 FOR_EACH_WRITER_NODE(i
, g
) {
84 struct writer_node
*wn
= &g
->writer_nodes
[i
];
86 ret
= wn
->writer
->open(wn
);
89 wn
->chunk_bytes
= ret
;
90 g
->max_chunk_bytes
= PARA_MAX(g
->max_chunk_bytes
, ret
);
92 sprintf(g
->task
.status
, "%s", "writer node group");
95 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
96 unregister_task(&g
->task
);
98 struct writer_node
*wn
= &g
->writer_nodes
[--i
];
99 wn
->writer
->close(wn
);
107 * unregister a writer node group task
109 * \param g the group whose task is to be closed
111 void wng_unregister(struct writer_node_group
*g
)
113 unregister_task(&g
->task
);
117 * call the close function of each writer in the given group
119 * \param g the writer node group to close
121 * This function also frees all resources of the given group.
123 void wng_close(struct writer_node_group
*g
)
129 PARA_NOTICE_LOG("closing wng with %d writer(s)\n", g
->num_writers
);
130 FOR_EACH_WRITER_NODE(i
, g
) {
131 struct writer_node
*wn
= &g
->writer_nodes
[i
];
132 wn
->writer
->close(wn
);
134 free(g
->writer_nodes
);
139 * allocate and initialize a new writer_node_group struct
141 * \param num_writers the number of writer nodes for the new group
143 * \return Pointer to the new writer node group
145 struct writer_node_group
*wng_new(unsigned num_writers
)
147 struct writer_node_group
*g
= para_calloc(sizeof(struct writer_node_group
));
148 g
->num_writers
= num_writers
;
149 g
->writer_nodes
= para_calloc(num_writers
150 * sizeof(struct writer_node
));
151 g
->task
.post_select
= wng_post_select
;
152 g
->task
.pre_select
= wng_pre_select
;
157 * call the init function of each supported paraslash writer
159 void init_supported_writers(void)
164 writers
[i
].init(&writers
[i
]);
167 * check if given string is a valid command line for any writer
169 * \param \wa string of the form writer_name:options
170 * \param writer_num contains the number of the writer upon success
172 * This function checks whether \a wa starts with the name of a supported
173 * paraslash writer, optionally followed by a colon and any options for that
174 * writer. If a valid writer name was found and further are present, the
175 * remaining part of \a wa is passed to that writer's config parser.
177 * \return On success, a pointer to the gengetopt args info struct is returned
178 * and \a writer_num contains the number of the writer. Otherwise this function
181 void *check_writer_arg(const char *wa
, int *writer_num
)
185 *writer_num
= -E_WRITE_COMMON_SYNTAX
;
186 PARA_INFO_LOG("checking %s\n", wa
);
188 const char *name
= writer_names
[i
];
189 size_t len
= strlen(name
);
191 if (strlen(wa
) < len
)
193 if (strncmp(name
, wa
, len
))
198 if (c
&& !writers
[i
].parse_config
)
201 return writers
[i
].parse_config(c
? wa
+ len
+ 1 : "");
203 PARA_ERROR_LOG("writer not found\n");
208 * setup a writer node group with only one writer, the default writer
210 * The writer which is set up depends on the OS. It defaults to alsa for Linux,
211 * osx_write for OS X, file writer if neither of these is supported.
213 * \return pointer to the allocated writer node group
215 struct writer_node_group
*setup_default_wng(void)
217 struct writer_node_group
*wng
= wng_new(1);
218 wng
->writer_nodes
[0].writer
= &writers
[DEFAULT_WRITER
];
219 PARA_INFO_LOG("using default writer: %s %p\n",
220 writer_names
[DEFAULT_WRITER
], writers
[DEFAULT_WRITER
].parse_config
);
221 wng
->writer_nodes
[0].conf
= writers
[DEFAULT_WRITER
].parse_config("");