src/filter_plugin.c

   1 /*
   2  * Copyright (C) 2003-2009 The Music Player Daemon Project
   3  * http://www.musicpd.org
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #include "filter_plugin.h"
  21 #include "filter_internal.h"
  22 #include "filter_registry.h"
  23 #include "conf.h"
  24
  25 #ifndef NDEBUG
  26 #include "audio_format.h"
  27 #endif
  28
  29 #include <assert.h>
  30
  31 struct filter *
  32 filter_new(const struct filter_plugin *plugin,
  33            const struct config_param *param, GError **error_r)
  34 {
  35         assert(plugin != NULL);
  36         assert(error_r == NULL || *error_r == NULL);
  37
  38         return plugin->init(param, error_r);
  39 }
  40
  41 struct filter *
  42 filter_configured_new(const struct config_param *param, GError **error_r)
  43 {
  44         const char *plugin_name;
  45         const struct filter_plugin *plugin;
  46
  47         assert(param != NULL);
  48         assert(error_r == NULL || *error_r == NULL);
  49
  50         plugin_name = config_get_block_string(param, "plugin", NULL);
  51         if (plugin_name == NULL)
  52                 g_set_error(error_r, config_quark(), 0,
  53                             "No filter plugin specified");
  54
  55         plugin = filter_plugin_by_name(plugin_name);
  56         if (plugin == NULL)
  57                 g_set_error(error_r, config_quark(), 0,
  58                             "No such filter plugin: %s", plugin_name);
  59
  60         return filter_new(plugin, param, error_r);
  61 }
  62
  63 void
  64 filter_free(struct filter *filter)
  65 {
  66         assert(filter != NULL);
  67
  68         filter->plugin->finish(filter);
  69 }
  70
  71 const struct audio_format *
  72 filter_open(struct filter *filter, const struct audio_format *audio_format,
  73             GError **error_r)
  74 {
  75         assert(filter != NULL);
  76         assert(audio_format != NULL);
  77         assert(audio_format_valid(audio_format));
  78         assert(error_r == NULL || *error_r == NULL);
  79
  80         audio_format = filter->plugin->open(filter, audio_format, error_r);
  81         assert(audio_format == NULL || audio_format_valid(audio_format));
  82
  83         return audio_format;
  84 }
  85
  86 void
  87 filter_close(struct filter *filter)
  88 {
  89         assert(filter != NULL);
  90
  91         filter->plugin->close(filter);
  92 }
  93
  94 const void *
  95 filter_filter(struct filter *filter, const void *src, size_t src_size,
  96               size_t *dest_size_r,
  97               GError **error_r)
  98 {
  99         assert(filter != NULL);
 100         assert(src != NULL);
 101         assert(src_size > 0);
 102         assert(dest_size_r != NULL);
 103         assert(error_r == NULL || *error_r == NULL);
 104
 105         return filter->plugin->filter(filter, src, src_size, dest_size_r, error_r);
 106 }