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(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                         return;
  42                 if (!i)
  43                         min_written = t->ret;
  44                 else
  45                         min_written = PARA_MIN(min_written, t->ret);
  46         }
  47         *g->loaded -= min_written;
  48         if (!*g->loaded && *g->eof)
  49                 t->ret = 0;
  50         else
  51                 t->ret = 1;
  52         if (*g->loaded && min_written)
  53                 memmove(g->buf, g->buf + min_written, *g->loaded);
  54 }
  55
  56 int wng_open(struct writer_node_group *g)
  57 {
  58         int i, ret = 1;
  59
  60         FOR_EACH_WRITER_NODE(i, g) {
  61                 struct writer_node *wn = &g->writer_nodes[i];
  62                 ret = wn->writer->open(wn);
  63                 if (ret < 0)
  64                         goto out;
  65                 wn->chunk_bytes = ret;
  66                 g->max_chunk_bytes = PARA_MAX(g->max_chunk_bytes, ret);
  67                 wn->wng = g;
  68                 PARA_DEBUG_LOG("pre_select: %p\n", &wn->writer->pre_select);
  69                 PARA_DEBUG_LOG("post_select: %p\n", &wn->writer->post_select);
  70                 wn->task.pre_select = wn->writer->pre_select;
  71                 wn->task.post_select = wn->writer->post_select;
  72                 wn->task.private_data = wn;
  73                 wn->task.flags = POST_EOF_IS_ERROR;
  74                 register_task(&wn->task);
  75         }
  76         register_task(&g->task);
  77 out:
  78         return ret;
  79 }
  80
  81 void wng_destroy(struct writer_node_group *g)
  82 {
  83         if (!g)
  84                 return;
  85         free(g->written);
  86         free(g->writer_nodes);
  87         free(g);
  88 }
  89
  90 void wng_close(struct writer_node_group *g)
  91 {
  92         int i;
  93
  94         FOR_EACH_WRITER_NODE(i, g) {
  95                 struct writer_node *wn = &g->writer_nodes[i];
  96                 unregister_task(&wn->task);
  97                 wn->writer->close(wn);
  98         }
  99 }
 100
 101 static void wng_error_handler(struct task *t)
 102 {
 103         struct writer_node_group *g = t->private_data;
 104
 105         PARA_INFO_LOG("%p: ret = %d\n", t, t->ret);
 106         unregister_task(t);
 107         wng_close(g);
 108         wng_destroy(g);
 109 }
 110
 111 struct writer_node_group *wng_new(unsigned num_writers)
 112 {
 113         struct writer_node_group *g = para_calloc(sizeof(struct writer_node_group));
 114         g->num_writers = num_writers;
 115         g->writer_nodes = para_calloc(num_writers
 116                 * sizeof(struct writer_node));
 117         g->written = para_calloc(num_writers * sizeof(size_t));
 118         g->task.private_data = g;
 119         g->task.post_select = wng_post_select;
 120         g->task.error_handler = wng_error_handler;
 121         g->task.flags = POST_ADD_TAIL | POST_EOF_IS_ERROR;
 122         return g;
 123 }
 124
 125 void init_supported_writers(void)
 126 {
 127         int i;
 128
 129         FOR_EACH_WRITER(i)
 130                 writers[i].init(&writers[i]);
 131 }
 132
 133 int check_writer_arg(const char *arg)
 134 {
 135         int i, ret = -E_WRITE_COMMON_SYNTAX;
 136         char *a = para_strdup(arg), *p = strchr(a, ':');
 137         if (p)
 138                 *p = '\0';
 139         p++;
 140         FOR_EACH_WRITER(i) {
 141                 if (strcmp(writer_names[i], a))
 142                         continue;
 143                 ret = i;
 144                 goto out;
 145         }
 146 out:
 147         free(a);
 148         return ret;
 149 }
 150
 151 struct writer_node_group *setup_default_wng(void)
 152 {
 153         struct writer_node_group *wng = wng_new(1);
 154         enum writer_enum default_writer;
 155
 156         if (NUM_SUPPORTED_WRITERS == 1)
 157                 default_writer = FILE_WRITE;
 158         else
 159                 default_writer = 1;
 160         wng->writer_nodes[0].writer = &writers[default_writer];
 161         PARA_INFO_LOG("using default writer: %s\n",
 162                 writer_names[default_writer]);
 163         return wng;
 164 }