write_common.c

   1 /*
   2  * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file write_common.c common functions of para_audiod and para_write */
  20
  21 #include "para.h"
  22 #include "string.h"
  23 #include "list.h"
  24 #include "sched.h"
  25 #include "write.h"
  26 #include "error.h"
  27
  28 const char *writer_names[] ={WRITER_NAMES};
  29 struct writer writers[NUM_SUPPORTED_WRITERS] = {WRITER_ARRAY};
  30
  31 static void wng_post_select(__a_unused struct sched *s, struct task *t)
  32 {
  33         struct writer_node_group *g = t->private_data;
  34         int i;
  35         size_t min_written = 0;
  36
  37         FOR_EACH_WRITER_NODE(i, g) {
  38                 struct writer_node *wn = &g->writer_nodes[i];
  39                 t->ret = wn->task.ret;
  40                 if (t->ret < 0) {
  41                         g->eof = 1;
  42                         return;
  43                 }
  44                 if (!i)
  45                         min_written = t->ret;
  46                 else
  47                         min_written = PARA_MIN(min_written, t->ret);
  48         }
  49         *g->loaded -= min_written;
  50         if (!*g->loaded && *g->input_eof) {
  51                 g->eof = 1;
  52                 t->ret = -E_WNG_EOF;
  53         } else
  54                 t->ret = 1;
  55         if (*g->loaded && min_written)
  56                 memmove(g->buf, g->buf + min_written, *g->loaded);
  57 }
  58
  59 int wng_open(struct writer_node_group *g)
  60 {
  61         int i, ret = 1;
  62
  63         PARA_NOTICE_LOG("opening wng %p with %d writer(s)\n", g, g->num_writers);
  64         register_task(&g->task);
  65         FOR_EACH_WRITER_NODE(i, g) {
  66                 struct writer_node *wn = &g->writer_nodes[i];
  67                 wn->wng = g;
  68                 ret = wn->writer->open(wn);
  69                 if (ret < 0)
  70                         goto err_out;
  71                 wn->chunk_bytes = ret;
  72                 g->max_chunk_bytes = PARA_MAX(g->max_chunk_bytes, ret);
  73                 wn->task.pre_select = wn->writer->pre_select;
  74                 wn->task.post_select = wn->writer->post_select;
  75                 wn->task.private_data = wn;
  76                 register_task(&wn->task);
  77         }
  78         sprintf(g->task.status, "%s", "writer node group");
  79         g->eof = 0;
  80         return 1;
  81 err_out:
  82         unregister_task(&g->task);
  83         while (i > 0) {
  84                 struct writer_node *wn = &g->writer_nodes[--i];
  85                 unregister_task(&wn->task);
  86                 wn->writer->close(wn);
  87         }
  88         g->num_writers = 0;
  89         g->eof = 1;
  90         return ret;
  91 }
  92
  93 void wng_unregister(struct writer_node_group *g)
  94 {
  95         int i;
  96
  97         FOR_EACH_WRITER_NODE(i, g) {
  98                 struct writer_node *wn = &g->writer_nodes[i];
  99                 unregister_task(&wn->task);
 100         }
 101         unregister_task(&g->task);
 102         g->eof = 1;
 103 }
 104
 105 void wng_close(struct writer_node_group *g)
 106 {
 107         int i;
 108
 109         if (!g)
 110                 return;
 111         PARA_NOTICE_LOG("closing wng with %d writer(s)\n", g->num_writers);
 112         FOR_EACH_WRITER_NODE(i, g) {
 113                 struct writer_node *wn = &g->writer_nodes[i];
 114                 wn->writer->close(wn);
 115         }
 116         free(g->written);
 117         free(g->writer_nodes);
 118         free(g);
 119 }
 120
 121 struct writer_node_group *wng_new(unsigned num_writers)
 122 {
 123         struct writer_node_group *g = para_calloc(sizeof(struct writer_node_group));
 124         g->num_writers = num_writers;
 125         g->writer_nodes = para_calloc(num_writers
 126                 * sizeof(struct writer_node));
 127         g->written = para_calloc(num_writers * sizeof(size_t));
 128         g->task.private_data = g;
 129         g->task.post_select = wng_post_select;
 130         return g;
 131 }
 132
 133 void init_supported_writers(void)
 134 {
 135         int i;
 136
 137         FOR_EACH_WRITER(i)
 138                 writers[i].init(&writers[i]);
 139 }
 140
 141 void *check_writer_arg(char *wa, int *writer_num)
 142 {
 143         int i;
 144
 145         *writer_num = -E_WRITE_COMMON_SYNTAX;
 146         PARA_INFO_LOG("checking  %s\n", wa);
 147         FOR_EACH_WRITER(i) {
 148                 const char *name = writer_names[i];
 149                 size_t len = strlen(name);
 150                 char c;
 151                 if (strlen(wa) < len)
 152                         continue;
 153                 if (strncmp(name, wa, len))
 154                         continue;
 155                 c = wa[len];
 156                 if (c && c != ' ')
 157                         continue;
 158                 if (c && !writers[i].parse_config)
 159                         return NULL;
 160                 *writer_num = i;
 161                 return writers[i].parse_config(c? wa + len + 1 : "");
 162         }
 163         PARA_ERROR_LOG("%s", "writer not found\n");
 164         return NULL;
 165 }
 166
 167 struct writer_node_group *setup_default_wng(void)
 168 {
 169         struct writer_node_group *wng = wng_new(1);
 170         enum writer_enum default_writer;
 171
 172         if (NUM_SUPPORTED_WRITERS == 1)
 173                 default_writer = FILE_WRITE;
 174         else
 175                 default_writer = 1;
 176         wng->writer_nodes[0].writer = &writers[default_writer];
 177         sprintf(wng->writer_nodes[0].task.status, "%s",
 178                 writer_names[default_writer]);
 179         PARA_INFO_LOG("using default writer: %s %p\n",
 180                 writer_names[default_writer], writers[default_writer].parse_config);
 181         wng->writer_nodes[0].conf = writers[default_writer].parse_config("");
 182         return wng;
 183 }