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 "write.h"
  24 #include "error.h"
  25
  26 const char *writer_names[] ={WRITER_NAMES};
  27 struct writer writers[NUM_SUPPORTED_WRITERS] = {WRITER_ARRAY};
  28
  29 int wng_write(struct writer_node_group *g, char *buf, size_t *loaded)
  30 {
  31         int ret, i, need_more_writes = 1;
  32         size_t min_written = 0;
  33
  34         while (need_more_writes) {
  35                 need_more_writes = 0;
  36                 FOR_EACH_WRITER_NODE(i, g) {
  37                         size_t w = g->written[i];
  38                         int bytes_to_write;
  39                         struct writer_node *wn = &g->writer_nodes[i];
  40                         if (!i)
  41                                 min_written = w;
  42                         else
  43                                 min_written = PARA_MIN(min_written, w);
  44                         if (w == *loaded)
  45                                 continue;
  46                         if (!g->eof && (*loaded < wn->chunk_bytes + w))
  47                                 continue;
  48                         bytes_to_write = PARA_MIN(wn->chunk_bytes,
  49                                 *loaded - w);
  50                         ret = wn->writer->write(buf + w, bytes_to_write, wn);
  51                         if (ret < 0)
  52                                 goto out;
  53                         if (ret != bytes_to_write)
  54                                 PARA_WARNING_LOG("short write: %d/%d\n", ret,
  55                                         bytes_to_write);
  56                         g->written[i] += ret;
  57                         need_more_writes = 1;
  58                 }
  59         }
  60         *loaded -= min_written;
  61         ret = 0;
  62         if (g->eof)
  63                 goto out;
  64         if (*loaded)
  65                 memmove(buf, buf + min_written, *loaded);
  66         FOR_EACH_WRITER_NODE(i, g)
  67                 g->written[i] -= min_written;
  68         ret = 1;
  69 out:
  70         return ret;
  71 }
  72
  73 int wng_open(struct writer_node_group *g)
  74 {
  75         int i, ret = 1;
  76
  77         FOR_EACH_WRITER_NODE(i, g) {
  78                 struct writer_node *wn = &g->writer_nodes[i];
  79                 ret = wn->writer->open(wn);
  80                 if (ret < 0)
  81                         goto out;
  82                 wn->chunk_bytes = ret;
  83                 g->max_chunk_bytes = PARA_MAX(g->max_chunk_bytes, ret);
  84         }
  85 out:
  86         return ret;
  87 }
  88
  89 void wng_close(struct writer_node_group *g)
  90 {
  91         int i;
  92
  93         FOR_EACH_WRITER_NODE(i, g) {
  94                 struct writer_node *wn = &g->writer_nodes[i];
  95                 wn->writer->close(wn);
  96         }
  97 }
  98
  99 struct writer_node_group *wng_new(unsigned num_writers)
 100 {
 101         struct writer_node_group *g = para_calloc(sizeof(struct writer_node_group));
 102         g->num_writers = num_writers;
 103         g->writer_nodes = para_calloc(num_writers
 104                 * sizeof(struct writer_node));
 105         g->written = para_calloc(num_writers * sizeof(size_t));
 106         return g;
 107 }
 108
 109 void wng_destroy(struct writer_node_group *g)
 110 {
 111         if (!g)
 112                 return;
 113         free(g->written);
 114         free(g->writer_nodes);
 115         free(g);
 116 }
 117
 118 void init_supported_writers(void)
 119 {
 120         int i;
 121
 122         FOR_EACH_WRITER(i)
 123                 writers[i].init(&writers[i]);
 124 }
 125
 126 int check_writer_arg(const char *arg)
 127 {
 128         int i, ret = -E_WRITE_COMMON_SYNTAX;
 129         char *a = para_strdup(arg), *p = strchr(a, ':');
 130         if (p)
 131                 *p = '\0';
 132         p++;
 133         FOR_EACH_WRITER(i) {
 134                 if (strcmp(writer_names[i], a))
 135                         continue;
 136                 ret = i;
 137                 goto out;
 138         }
 139 out:
 140         free(a);
 141         return ret;
 142 }
 143
 144 struct writer_node_group *setup_default_wng(void)
 145 {
 146         struct writer_node_group *wng = wng_new(1);
 147         enum writer_enum default_writer;
 148
 149         if (NUM_SUPPORTED_WRITERS == 1)
 150                 default_writer = FILE_WRITE;
 151         else
 152                 default_writer = 1;
 153         wng->writer_nodes[0].writer = &writers[default_writer];
 154         PARA_INFO_LOG("using default writer: %s\n",
 155                 writer_names[default_writer]);
 156         return wng;
 157 }