write_common.c

   1 /*
   2  * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file write_common.c common functions of para_audiod and para_write */
   8
   9 #include "para.h"
  10 #include "string.h"
  11 #include "list.h"
  12 #include "sched.h"
  13 #include "ggo.h"
  14 #include "write.h"
  15 #include "error.h"
  16
  17 /** the array containing the names of all supported writers */
  18 const char *writer_names[] ={WRITER_NAMES};
  19
  20 /** the array of supported writers */
  21 struct writer writers[NUM_SUPPORTED_WRITERS] = {WRITER_ARRAY};
  22
  23 static void wng_pre_select(__a_unused struct sched *s, struct task *t)
  24 {
  25         struct writer_node_group *g = container_of(t, struct writer_node_group, task);
  26         int i;
  27
  28         FOR_EACH_WRITER_NODE(i, g) {
  29                 struct writer_node *wn = &g->writer_nodes[i];
  30                 if (!wn->writer->pre_select)
  31                         continue;
  32                 t->error = wn->writer->pre_select(s, wn);
  33                 if (t->error < 0)
  34                         return;
  35         }
  36 }
  37
  38 static void wng_post_select(struct sched *s, struct task *t)
  39 {
  40         struct writer_node_group *g = container_of(t, struct writer_node_group, task);
  41         int i;
  42         size_t min_written = 0;
  43
  44         FOR_EACH_WRITER_NODE(i, g) {
  45                 struct writer_node *wn = &g->writer_nodes[i];
  46                 t->error = wn->writer->post_select(s, wn);
  47                 if (t->error < 0)
  48                         return;
  49                 if (!i)
  50                         min_written = wn->written;
  51                 else
  52                         min_written = PARA_MIN(min_written, wn->written);
  53         }
  54         //PARA_INFO_LOG("loaded: %zd, min_written: %zd bytes\n", *g->loaded, min_written);
  55         if (min_written) {
  56                 *g->loaded -= min_written;
  57                 FOR_EACH_WRITER_NODE(i, g)
  58                         g->writer_nodes[i].written -= min_written;
  59         }
  60         if (!*g->loaded && *g->input_error) {
  61                 t->error = *g->input_error;
  62                 return;
  63         }
  64         if (*g->loaded && min_written) {
  65 //              PARA_INFO_LOG("moving %zd bytes\n", *g->loaded);
  66                 memmove(*g->bufp, *g->bufp + min_written, *g->loaded);
  67         }
  68 }
  69
  70 /**
  71  * call the open function of each writer in the group
  72  *
  73  * \param g the writer node group
  74  *
  75  * \return If at least one open function returned an error, all successful
  76  * writer notes get closed and this error value is returned. Upon success, a
  77  * task associated with \a g is registered to the scheduler and the function
  78  * returns a positive value.
  79  * */
  80 int wng_open(struct writer_node_group *g)
  81 {
  82         int i, ret = 1;
  83
  84         PARA_NOTICE_LOG("opening wng %p with %d writer(s)\n", g, g->num_writers);
  85         FOR_EACH_WRITER_NODE(i, g) {
  86                 struct writer_node *wn = &g->writer_nodes[i];
  87                 wn->wng = g;
  88                 ret = wn->writer->open(wn);
  89                 if (ret < 0)
  90                         goto err_out;
  91         }
  92         sprintf(g->task.status, "%s", "writer node group");
  93         register_task(&g->task);
  94         g->open = 1;
  95         return 1;
  96 err_out:
  97         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
  98         while (i > 0) {
  99                 struct writer_node *wn = &g->writer_nodes[--i];
 100                 wn->writer->close(wn);
 101         }
 102         g->num_writers = 0;
 103         return ret;
 104 }
 105
 106 /**
 107  * call the close function of each writer in the given group
 108  *
 109  * \param g the writer node group to close
 110  *
 111  * This function also frees all resources of the given group.
 112  */
 113 void wng_close(struct writer_node_group *g)
 114 {
 115         int i;
 116
 117         if (!g || !g->open)
 118                 return;
 119         PARA_NOTICE_LOG("closing wng with %d writer(s)\n", g->num_writers);
 120         FOR_EACH_WRITER_NODE(i, g) {
 121                 struct writer_node *wn = &g->writer_nodes[i];
 122                 wn->writer->close(wn);
 123         }
 124         free(g->writer_nodes);
 125         free(g);
 126 }
 127
 128 /**
 129  * allocate and initialize a new writer_node_group struct
 130  *
 131  * \param num_writers the number of writer nodes for the new group
 132  *
 133  * \return Pointer to the new writer node group
 134  */
 135 struct writer_node_group *wng_new(unsigned num_writers)
 136 {
 137         struct writer_node_group *g = para_calloc(sizeof(struct writer_node_group));
 138         g->num_writers = num_writers;
 139         g->writer_nodes = para_calloc(num_writers
 140                 * sizeof(struct writer_node));
 141         g->task.post_select = wng_post_select;
 142         g->task.pre_select = wng_pre_select;
 143         return g;
 144 }
 145
 146 /**
 147  * Call the init function of each supported paraslash writer.
 148  */
 149 void writer_init(void)
 150 {
 151         int i;
 152
 153         FOR_EACH_WRITER(i)
 154                 writers[i].init(&writers[i]);
 155 }
 156 /**
 157  * check if given string is a valid command line for any writer
 158  *
 159  * \param \wa string of the form writer_name:options
 160  * \param writer_num contains the number of the writer upon success
 161  *
 162  * This function checks whether \a wa starts with the name of a supported
 163  * paraslash writer, optionally followed by a colon and any options for that
 164  * writer.  If a valid writer name was found and further are present, the
 165  * remaining part of \a wa is passed to that writer's config parser.
 166  *
 167  * \return On success, a pointer to the gengetopt args info struct is returned
 168  * and \a writer_num contains the number of the writer. Otherwise this function
 169  * returns \p NULL.
 170  */
 171 void *check_writer_arg(const char *wa, int *writer_num)
 172 {
 173         int i;
 174
 175         *writer_num = -E_WRITE_COMMON_SYNTAX;
 176         PARA_INFO_LOG("checking  %s\n", wa);
 177         FOR_EACH_WRITER(i) {
 178                 const char *name = writer_names[i];
 179                 size_t len = strlen(name);
 180                 char c;
 181                 if (strlen(wa) < len)
 182                         continue;
 183                 if (strncmp(name, wa, len))
 184                         continue;
 185                 c = wa[len];
 186                 if (c && c != ' ')
 187                         continue;
 188                 if (c && !writers[i].parse_config)
 189                         return NULL;
 190                 *writer_num = i;
 191                 return writers[i].parse_config(c? wa + len + 1 : "");
 192         }
 193         PARA_ERROR_LOG("writer not found\n");
 194         return NULL;
 195 }
 196
 197 /**
 198  * setup a writer node group with only one writer, the default writer
 199  *
 200  * The writer which is set up depends on the OS. It defaults to alsa for Linux,
 201  * osx_write for OS X, file writer if neither of these is supported.
 202  *
 203  * \return pointer to the allocated writer node group
 204  */
 205 struct writer_node_group *setup_default_wng(void)
 206 {
 207         struct writer_node_group *wng = wng_new(1);
 208         wng->writer_nodes[0].writer = &writers[DEFAULT_WRITER];
 209         PARA_INFO_LOG("using default writer: %s %p\n",
 210                 writer_names[DEFAULT_WRITER], writers[DEFAULT_WRITER].parse_config);
 211         wng->writer_nodes[0].conf = writers[DEFAULT_WRITER].parse_config("");
 212         return wng;
 213 }
 214
 215 void print_writer_helps(int detailed)
 216 {
 217         int i;
 218
 219         printf_or_die("\nAvailable writers: \n\t");
 220         FOR_EACH_WRITER(i)
 221                 printf_or_die("%s%s", i? " " : "", writer_names[i]);
 222         printf_or_die("\n\n");
 223         FOR_EACH_WRITER(i) {
 224                 struct writer *w = writers + i;
 225
 226                 if (!w->help.short_help)
 227                         continue;
 228                 printf_or_die("Options for %s:\n", writer_names[i]);
 229                 ggo_print_help(&w->help, detailed);
 230         }
 231 }