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_pre_select(__a_unused struct sched *s, struct task *t)
  32 {
  33         struct writer_node_group *g = t->private_data;
  34         int i;
  35
  36         FOR_EACH_WRITER_NODE(i, g) {
  37                 struct writer_node *wn = &g->writer_nodes[i];
  38                 t->ret = wn->writer->pre_select(s, wn);
  39                 if (t->ret < 0) {
  40                         g->eof = 1;
  41                         return;
  42                 }
  43         }
  44 }
  45
  46 static void wng_post_select(struct sched *s, struct task *t)
  47 {
  48         struct writer_node_group *g = t->private_data;
  49         int i;
  50         size_t min_written = 0;
  51
  52         FOR_EACH_WRITER_NODE(i, g) {
  53                 struct writer_node *wn = &g->writer_nodes[i];
  54                 t->ret = wn->writer->post_select(s, wn);
  55                 if (t->ret < 0) {
  56                         g->eof = 1;
  57                         return;
  58                 }
  59                 if (!i)
  60                         min_written = t->ret;
  61                 else
  62                         min_written = PARA_MIN(min_written, t->ret);
  63         }
  64         *g->loaded -= min_written;
  65         if (!*g->loaded && *g->input_eof) {
  66                 g->eof = 1;
  67                 t->ret = -E_WNG_EOF;
  68         } else
  69                 t->ret = 1;
  70         if (*g->loaded && min_written)
  71                 memmove(g->buf, g->buf + min_written, *g->loaded);
  72 }
  73
  74 int wng_open(struct writer_node_group *g)
  75 {
  76         int i, ret = 1;
  77
  78         PARA_NOTICE_LOG("opening wng %p with %d writer(s)\n", g, g->num_writers);
  79         register_task(&g->task);
  80         FOR_EACH_WRITER_NODE(i, g) {
  81                 struct writer_node *wn = &g->writer_nodes[i];
  82                 wn->wng = g;
  83                 ret = wn->writer->open(wn);
  84                 if (ret < 0)
  85                         goto err_out;
  86                 wn->chunk_bytes = ret;
  87                 g->max_chunk_bytes = PARA_MAX(g->max_chunk_bytes, ret);
  88         }
  89         sprintf(g->task.status, "%s", "writer node group");
  90         g->eof = 0;
  91         return 1;
  92 err_out:
  93         unregister_task(&g->task);
  94         while (i > 0) {
  95                 struct writer_node *wn = &g->writer_nodes[--i];
  96                 wn->writer->close(wn);
  97         }
  98         g->num_writers = 0;
  99         g->eof = 1;
 100         return ret;
 101 }
 102
 103 void wng_unregister(struct writer_node_group *g)
 104 {
 105         unregister_task(&g->task);
 106         g->eof = 1;
 107 }
 108
 109 void wng_close(struct writer_node_group *g)
 110 {
 111         int i;
 112
 113         if (!g)
 114                 return;
 115         PARA_NOTICE_LOG("closing wng with %d writer(s)\n", g->num_writers);
 116         FOR_EACH_WRITER_NODE(i, g) {
 117                 struct writer_node *wn = &g->writer_nodes[i];
 118                 wn->writer->close(wn);
 119         }
 120         free(g->written);
 121         free(g->writer_nodes);
 122         free(g);
 123 }
 124
 125 struct writer_node_group *wng_new(unsigned num_writers)
 126 {
 127         struct writer_node_group *g = para_calloc(sizeof(struct writer_node_group));
 128         g->num_writers = num_writers;
 129         g->writer_nodes = para_calloc(num_writers
 130                 * sizeof(struct writer_node));
 131         g->written = para_calloc(num_writers * sizeof(size_t));
 132         g->task.private_data = g;
 133         g->task.post_select = wng_post_select;
 134         g->task.pre_select = wng_pre_select;
 135         return g;
 136 }
 137
 138 void init_supported_writers(void)
 139 {
 140         int i;
 141
 142         FOR_EACH_WRITER(i)
 143                 writers[i].init(&writers[i]);
 144 }
 145
 146 void *check_writer_arg(char *wa, int *writer_num)
 147 {
 148         int i;
 149
 150         *writer_num = -E_WRITE_COMMON_SYNTAX;
 151         PARA_INFO_LOG("checking  %s\n", wa);
 152         FOR_EACH_WRITER(i) {
 153                 const char *name = writer_names[i];
 154                 size_t len = strlen(name);
 155                 char c;
 156                 if (strlen(wa) < len)
 157                         continue;
 158                 if (strncmp(name, wa, len))
 159                         continue;
 160                 c = wa[len];
 161                 if (c && c != ' ')
 162                         continue;
 163                 if (c && !writers[i].parse_config)
 164                         return NULL;
 165                 *writer_num = i;
 166                 return writers[i].parse_config(c? wa + len + 1 : "");
 167         }
 168         PARA_ERROR_LOG("%s", "writer not found\n");
 169         return NULL;
 170 }
 171
 172 struct writer_node_group *setup_default_wng(void)
 173 {
 174         struct writer_node_group *wng = wng_new(1);
 175         enum writer_enum default_writer;
 176
 177         if (NUM_SUPPORTED_WRITERS == 1)
 178                 default_writer = FILE_WRITE;
 179         else
 180                 default_writer = 1;
 181         wng->writer_nodes[0].writer = &writers[default_writer];
 182         PARA_INFO_LOG("using default writer: %s %p\n",
 183                 writer_names[default_writer], writers[default_writer].parse_config);
 184         wng->writer_nodes[0].conf = writers[default_writer].parse_config("");
 185         return wng;
 186 }