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 int wng_write(struct writer_node_group *g, char *buf, size_t *loaded)
  32 {
  33         int ret, i, need_more_writes = 1;
  34         size_t min_written = 0;
  35
  36         while (need_more_writes) {
  37                 need_more_writes = 0;
  38                 FOR_EACH_WRITER_NODE(i, g) {
  39                         size_t w = g->written[i];
  40                         int bytes_to_write;
  41                         struct writer_node *wn = &g->writer_nodes[i];
  42                         if (!i)
  43                                 min_written = w;
  44                         else
  45                                 min_written = PARA_MIN(min_written, w);
  46                         if (w == *loaded)
  47                                 continue;
  48                         if (!g->eof && (*loaded < wn->chunk_bytes + w))
  49                                 continue;
  50                         bytes_to_write = PARA_MIN(wn->chunk_bytes,
  51                                 *loaded - w);
  52                         ret = wn->writer->write(buf + w, bytes_to_write, wn);
  53                         if (ret < 0)
  54                                 goto out;
  55                         if (ret != bytes_to_write)
  56                                 PARA_WARNING_LOG("short write: %d/%d\n", ret,
  57                                         bytes_to_write);
  58                         g->written[i] += ret;
  59                         need_more_writes = 1;
  60                 }
  61         }
  62         *loaded -= min_written;
  63         ret = 0;
  64         if (g->eof)
  65                 goto out;
  66         if (*loaded)
  67                 memmove(buf, buf + min_written, *loaded);
  68         FOR_EACH_WRITER_NODE(i, g)
  69                 g->written[i] -= min_written;
  70         ret = 1;
  71 out:
  72         return ret;
  73 }
  74
  75 static void wng_post_select(struct sched *s, struct task *t)
  76 {
  77         struct writer_node_group *g = t->private_data;
  78         int i;
  79         size_t min_written = 0;
  80
  81         FOR_EACH_WRITER_NODE(i, g) {
  82                 struct writer_node *wn = &g->writer_nodes[i];
  83                 t->ret = wn->task.ret;
  84                 if (t->ret < 0)
  85                         return;
  86                 if (!i)
  87                         min_written = t->ret;
  88                 else
  89                         min_written = PARA_MIN(min_written, t->ret);
  90         }
  91         *g->loaded -= min_written;
  92         if (!*g->loaded && g->eof)
  93                 t->ret = 0;
  94         else
  95                 t->ret = 1;
  96         if (*g->loaded && min_written)
  97                 memmove(g->buf, g->buf + min_written, *g->loaded);
  98 }
  99
 100 int wng_open(struct writer_node_group *g)
 101 {
 102         int i, ret = 1;
 103
 104         FOR_EACH_WRITER_NODE(i, g) {
 105                 struct writer_node *wn = &g->writer_nodes[i];
 106                 ret = wn->writer->open(wn);
 107                 if (ret < 0)
 108                         goto out;
 109                 wn->chunk_bytes = ret;
 110                 g->max_chunk_bytes = PARA_MAX(g->max_chunk_bytes, ret);
 111                 wn->wng = g;
 112                 PARA_DEBUG_LOG("pre_select: %p\n", &wn->writer->pre_select);
 113                 PARA_DEBUG_LOG("post_select: %p\n", &wn->writer->post_select);
 114                 wn->task.pre_select = wn->writer->pre_select;
 115                 wn->task.post_select = wn->writer->post_select;
 116                 wn->task.private_data = wn;
 117                 register_task(&wn->task);
 118         }
 119         register_task(&g->task);
 120 out:
 121         return ret;
 122 }
 123
 124 void wng_destroy(struct writer_node_group *g)
 125 {
 126         if (!g)
 127                 return;
 128         free(g->written);
 129         free(g->writer_nodes);
 130         free(g);
 131 }
 132
 133 void wng_close(struct writer_node_group *g)
 134 {
 135         int i;
 136
 137         FOR_EACH_WRITER_NODE(i, g) {
 138                 struct writer_node *wn = &g->writer_nodes[i];
 139                 unregister_task(&wn->task);
 140                 wn->writer->close(wn);
 141         }
 142 }
 143
 144 static void wng_error_handler(struct task *t)
 145 {
 146         struct writer_node_group *g = t->private_data;
 147
 148         PARA_INFO_LOG("%p: ret = %d\n", t, t->ret);
 149         unregister_task(t);
 150         wng_close(g);
 151         wng_destroy(g);
 152 }
 153
 154 struct writer_node_group *wng_new(unsigned num_writers)
 155 {
 156         struct writer_node_group *g = para_calloc(sizeof(struct writer_node_group));
 157         g->num_writers = num_writers;
 158         g->writer_nodes = para_calloc(num_writers
 159                 * sizeof(struct writer_node));
 160         g->written = para_calloc(num_writers * sizeof(size_t));
 161         g->task.private_data = g;
 162         g->task.post_select = wng_post_select;
 163         g->task.error_handler = wng_error_handler;
 164         g->task.flags = POST_ADD_TAIL | POST_EOF_IS_ERROR;
 165         return g;
 166 }
 167
 168 void init_supported_writers(void)
 169 {
 170         int i;
 171
 172         FOR_EACH_WRITER(i)
 173                 writers[i].init(&writers[i]);
 174 }
 175
 176 int check_writer_arg(const char *arg)
 177 {
 178         int i, ret = -E_WRITE_COMMON_SYNTAX;
 179         char *a = para_strdup(arg), *p = strchr(a, ':');
 180         if (p)
 181                 *p = '\0';
 182         p++;
 183         FOR_EACH_WRITER(i) {
 184                 if (strcmp(writer_names[i], a))
 185                         continue;
 186                 ret = i;
 187                 goto out;
 188         }
 189 out:
 190         free(a);
 191         return ret;
 192 }
 193
 194 struct writer_node_group *setup_default_wng(void)
 195 {
 196         struct writer_node_group *wng = wng_new(1);
 197         enum writer_enum default_writer;
 198
 199         if (NUM_SUPPORTED_WRITERS == 1)
 200                 default_writer = FILE_WRITE;
 201         else
 202                 default_writer = 1;
 203         wng->writer_nodes[0].writer = &writers[default_writer];
 204         PARA_INFO_LOG("using default writer: %s\n",
 205                 writer_names[default_writer]);
 206         return wng;
 207 }