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                         unsigned char *p = buf + w;
  39                         int bytes_to_write;
  40                         struct writer_node *wn = &g->writer_nodes[i];
  41                         if (!i)
  42                                 min_written = w;
  43                         else
  44                                 min_written = PARA_MIN(min_written, w);
  45                         if (w == *loaded)
  46                                 continue;
  47                         if (!g->eof && (*loaded < wn->chunk_bytes + w))
  48                                 continue;
  49                         bytes_to_write = PARA_MIN(wn->chunk_bytes,
  50                                 *loaded - w);
  51                         ret = wn->writer->write(p, bytes_to_write, wn);
  52                         if (ret < 0)
  53                                 goto out;
  54                         if (ret != bytes_to_write)
  55                                 PARA_WARNING_LOG("short write: %d/%d\n", ret,
  56                                         bytes_to_write);
  57                         g->written[i] += ret;
  58                         need_more_writes = 1;
  59                 }
  60         }
  61         *loaded -= min_written;
  62         ret = 0;
  63         if (g->eof)
  64                 goto out;
  65         if (*loaded)
  66                 memmove(buf, buf + min_written, *loaded);
  67         FOR_EACH_WRITER_NODE(i, g)
  68                 g->written[i] -= min_written;
  69         ret = 1;
  70 out:
  71         return ret;
  72 }
  73
  74 int wng_open(struct writer_node_group *g)
  75 {
  76         int i, ret = 1;
  77
  78         FOR_EACH_WRITER_NODE(i, g) {
  79                 struct writer_node *wn = &g->writer_nodes[i];
  80                 ret = wn->writer->open(wn);
  81                 if (ret < 0)
  82                         goto out;
  83                 wn->chunk_bytes = ret;
  84                 g->max_chunk_bytes = PARA_MAX(g->max_chunk_bytes, ret);
  85         }
  86 out:
  87         return ret;
  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                 wn->writer->close(wn);
  97         }
  98 }
  99
 100 struct writer_node_group *wng_new(unsigned num_writers)
 101 {
 102         struct writer_node_group *g = para_calloc(sizeof(struct writer_node_group));
 103         g->num_writers = num_writers;
 104         g->writer_nodes = para_calloc(num_writers
 105                 * sizeof(struct writer_node));
 106         g->written = para_calloc(num_writers * sizeof(size_t));
 107         return g;
 108 }
 109
 110 void wng_destroy(struct writer_node_group *g)
 111 {
 112         if (!g)
 113                 return;
 114         free(g->written);
 115         free(g->writer_nodes);
 116         free(g);
 117 }
 118
 119 void init_supported_writers(void)
 120 {
 121         int i;
 122
 123         FOR_EACH_WRITER(i)
 124                 writers[i].init(&writers[i]);
 125 }
 126
 127 int check_writer_arg(const char *arg)
 128 {
 129         int i, ret = -E_WRITE_COMMON_SYNTAX;
 130         char *a = para_strdup(arg), *p = strchr(a, ':');
 131         if (p)
 132                 *p = '\0';
 133         p++;
 134         FOR_EACH_WRITER(i) {
 135                 if (strcmp(writer_names[i], a))
 136                         continue;
 137                 ret = i;
 138                 goto out;
 139         }
 140 out:
 141         free(a);
 142         return ret;
 143 }
 144
 145 struct writer_node_group *setup_default_wng(void)
 146 {
 147         struct writer_node_group *wng = wng_new(1);
 148         enum writer_enum default_writer;
 149
 150         if (NUM_SUPPORTED_WRITERS == 1)
 151                 default_writer = FILE_WRITE;
 152         else
 153                 default_writer = 1;
 154         wng->writer_nodes[0].writer = &writers[default_writer];
 155         PARA_INFO_LOG("using default writer: %s\n",
 156                 writer_names[default_writer]);
 157         return wng;
 158 }