src/filter_plugin.c

   1 /*
   2  * Copyright (C) 2003-2010 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 "config.h"
  21 #include "filter_plugin.h"
  22 #include "filter_internal.h"
  23 #include "filter_registry.h"
  24 #include "conf.h"
  25
  26 #ifndef NDEBUG
  27 #include "audio_format.h"
  28 #endif
  29
  30 #include <assert.h>
  31
  32 struct filter *
  33 filter_new(const struct filter_plugin *plugin,
  34            const struct config_param *param, GError **error_r)
  35 {
  36         assert(plugin != NULL);
  37         assert(error_r == NULL || *error_r == NULL);
  38
  39         return plugin->init(param, error_r);
  40 }
  41
  42 struct filter *
  43 filter_configured_new(const struct config_param *param, GError **error_r)
  44 {
  45         const char *plugin_name;
  46         const struct filter_plugin *plugin;
  47
  48         assert(param != NULL);
  49         assert(error_r == NULL || *error_r == NULL);
  50
  51         plugin_name = config_get_block_string(param, "plugin", NULL);
  52         if (plugin_name == NULL) {
  53                 g_set_error(error_r, config_quark(), 0,
  54                             "No filter plugin specified");
  55                 return NULL;
  56         }
  57
  58         plugin = filter_plugin_by_name(plugin_name);
  59         if (plugin == NULL) {
  60                 g_set_error(error_r, config_quark(), 0,
  61                             "No such filter plugin: %s", plugin_name);
  62                 return NULL;
  63         }
  64
  65         return filter_new(plugin, param, error_r);
  66 }
  67
  68 void
  69 filter_free(struct filter *filter)
  70 {
  71         assert(filter != NULL);
  72
  73         filter->plugin->finish(filter);
  74 }
  75
  76 const struct audio_format *
  77 filter_open(struct filter *filter, struct audio_format *audio_format,
  78             GError **error_r)
  79 {
  80         const struct audio_format *out_audio_format;
  81
  82         assert(filter != NULL);
  83         assert(audio_format != NULL);
  84         assert(audio_format_valid(audio_format));
  85         assert(error_r == NULL || *error_r == NULL);
  86
  87         out_audio_format = filter->plugin->open(filter, audio_format, error_r);
  88
  89         assert(out_audio_format == NULL || audio_format_valid(audio_format));
  90         assert(out_audio_format == NULL ||
  91                audio_format_valid(out_audio_format));
  92
  93         return out_audio_format;
  94 }
  95
  96 void
  97 filter_close(struct filter *filter)
  98 {
  99         assert(filter != NULL);
 100
 101         filter->plugin->close(filter);
 102 }
 103
 104 const void *
 105 filter_filter(struct filter *filter, const void *src, size_t src_size,
 106               size_t *dest_size_r,
 107               GError **error_r)
 108 {
 109         assert(filter != NULL);
 110         assert(src != NULL);
 111         assert(src_size > 0);
 112         assert(dest_size_r != NULL);
 113         assert(error_r == NULL || *error_r == NULL);
 114
 115         return filter->plugin->filter(filter, src, src_size, dest_size_r, error_r);
 116 }