Initial working version.

build.sh

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+#!/bin/sh
+if [ "$#" -ne 1 ]
+then
+  echo "Usage: sh build path_to_deadbeef.h"
+  exit 1
+fi
+if [ ! -d "$1" ]; then
+  echo "$1 is not a directory."
+  echo "Usage: sh build path_to_dir_with_deadbeef.h"
+  exit 1
+fi
+gcc -Wall -I$1 -fPIC -std=c99 -shared -O2 -o rating.so rating.c && echo "Built rating.so"

easyinstall.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+cp -v rating.so ~/.local/lib/deadbeef

easyuninstall.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+rm -v ~/.local/lib/deadbeef/rating.so

rating.c

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+#include <deadbeef.h>
+#include <string.h>
+#include <stdlib.h>
+
+// #define trace(...) { fprintf(stderr, __VA_ARGS__); }
+
+static DB_misc_t plugin;
+static DB_functions_t *deadbeef;
+
+DB_plugin_t *
+rating_load (DB_functions_t *api) {
+    deadbeef = api;
+    return DB_PLUGIN (&plugin);
+}
+
+static int
+rating_start (void) {
+    return 0;
+}
+
+static int
+rating_stop (void) {
+    return 0;
+}
+
+// Removes rating tag when rating == -1, otherwise sets specified rating.
+static int
+rating_action_rate_helper (DB_plugin_action_t *action, int ctx, int rating)
+{
+    DB_playItem_t *it = NULL;
+    ddb_playlist_t *plt = NULL;
+    int num = 0;
+
+    if (ctx == DDB_ACTION_CTX_SELECTION) {
+        plt = deadbeef->plt_get_curr ();
+        if (plt) {
+            num = deadbeef->plt_getselcount (plt);
+            it = deadbeef->plt_get_first (plt, PL_MAIN);
+            while (it) {
+                if (deadbeef->pl_is_selected (it)) {
+                    break;
+                }
+                DB_playItem_t *next = deadbeef->pl_get_next (it, PL_MAIN);
+                deadbeef->pl_item_unref (it);
+                it = next;
+            }
+            deadbeef->plt_unref (plt);
+        }
+    } else if (ctx == DDB_ACTION_CTX_NOWPLAYING) {
+        it = deadbeef->streamer_get_playing_track ();
+        plt = deadbeef->plt_get_curr ();
+        if (plt) {
+            num = deadbeef->plt_getselcount (plt);
+        }
+    }
+    if (!it || !plt || num < 1) {
+        goto out;
+    }
+
+    int count = 0;
+    while (it) {
+        if (deadbeef->pl_is_selected (it)) {
+            if (rating == -1) {
+                deadbeef->pl_delete_meta(it, "rating");
+            } else {
+                deadbeef->pl_set_meta_int(it, "rating", rating);
+            }
+            deadbeef->pl_lock ();
+            const char *dec = deadbeef->pl_find_meta_raw (it, ":DECODER");
+            char decoder_id[100];
+            if (dec) {
+                strncpy (decoder_id, dec, sizeof (decoder_id));
+            }
+            int match = it && dec;
+            deadbeef->pl_unlock ();
+            if (match) {
+                int is_subtrack = deadbeef->pl_get_item_flags (it) & DDB_IS_SUBTRACK;
+                if (is_subtrack) {
+                    continue;
+                }
+                DB_decoder_t *dec = NULL;
+                DB_decoder_t **decoders = deadbeef->plug_get_decoder_list ();
+                for (int i = 0; decoders[i]; i++) {
+                    if (!strcmp (decoders[i]->plugin.id, decoder_id)) {
+                        dec = decoders[i];
+                        if (dec->write_metadata) {
+                            dec->write_metadata (it);
+                        }
+                        break;
+                    }
+                }
+            }
+            count++;
+            if (count >= num) {
+                break;
+            }
+        }
+        DB_playItem_t *next = deadbeef->pl_get_next (it, PL_MAIN);
+        deadbeef->pl_item_unref (it);
+        it = next;
+    }
+    if (plt) {
+        deadbeef->plt_modified (plt);
+    }
+
+out:
+    if (it) {
+        deadbeef->pl_item_unref (it);
+    }
+    return 0;
+}
+
+static int
+rating_action_rate0 (DB_plugin_action_t *action, int ctx)
+{
+    return rating_action_rate_helper(action, ctx, 0);
+}
+
+static int
+rating_action_rate1 (DB_plugin_action_t *action, int ctx)
+{
+    return rating_action_rate_helper(action, ctx, 1);
+}
+
+static int
+rating_action_rate2 (DB_plugin_action_t *action, int ctx)
+{
+    return rating_action_rate_helper(action, ctx, 2);
+}
+
+static int
+rating_action_rate3 (DB_plugin_action_t *action, int ctx)
+{
+    return rating_action_rate_helper(action, ctx, 3);
+}
+
+static int
+rating_action_rate4 (DB_plugin_action_t *action, int ctx)
+{
+    return rating_action_rate_helper(action, ctx, 4);
+}
+
+static int
+rating_action_rate5 (DB_plugin_action_t *action, int ctx)
+{
+    return rating_action_rate_helper(action, ctx, 5);
+}
+
+static int
+rating_action_remove (DB_plugin_action_t *action, int ctx)
+{
+    return rating_action_rate_helper(action, ctx, -1);
+}
+
+static DB_plugin_action_t remove_rating_action = {
+    .title = "Remove rating tag",
+    .name = "rating_remove",
+    .flags = DB_ACTION_SINGLE_TRACK | DB_ACTION_MULTIPLE_TRACKS | DB_ACTION_ADD_MENU,
+    .callback2 = rating_action_remove,
+    .next = NULL
+};
+
+static DB_plugin_action_t rate5_action = {
+    .title = "Rate 5",
+    .name = "rating_rate5",
+    .flags = DB_ACTION_SINGLE_TRACK | DB_ACTION_MULTIPLE_TRACKS | DB_ACTION_ADD_MENU,
+    .callback2 = rating_action_rate5,
+    .next = &remove_rating_action
+};
+
+static DB_plugin_action_t rate4_action = {
+    .title = "Rate 4",
+    .name = "rating_rate4",
+    .flags = DB_ACTION_SINGLE_TRACK | DB_ACTION_MULTIPLE_TRACKS | DB_ACTION_ADD_MENU,
+    .callback2 = rating_action_rate4,
+    .next = &rate5_action
+};
+
+static DB_plugin_action_t rate3_action = {
+    .title = "Rate 3",
+    .name = "rating_rate3",
+    .flags = DB_ACTION_SINGLE_TRACK | DB_ACTION_MULTIPLE_TRACKS | DB_ACTION_ADD_MENU,
+    .callback2 = rating_action_rate3,
+    .next = &rate4_action
+};
+
+static DB_plugin_action_t rate2_action = {
+    .title = "Rate 2",
+    .name = "rating_rate2",
+    .flags = DB_ACTION_SINGLE_TRACK | DB_ACTION_MULTIPLE_TRACKS | DB_ACTION_ADD_MENU,
+    .callback2 = rating_action_rate2,
+    .next = &rate3_action
+};
+
+static DB_plugin_action_t rate1_action = {
+    .title = "Rate 1",
+    .name = "rating_rate1",
+    .flags = DB_ACTION_SINGLE_TRACK | DB_ACTION_MULTIPLE_TRACKS | DB_ACTION_ADD_MENU,
+    .callback2 = rating_action_rate1,
+    .next = &rate2_action
+};
+
+static DB_plugin_action_t rate0_action = {
+    .title = "Rate 0",
+    .name = "rating_rate0",
+    .flags = DB_ACTION_SINGLE_TRACK | DB_ACTION_MULTIPLE_TRACKS | DB_ACTION_ADD_MENU,
+    .callback2 = rating_action_rate0,
+    .next = &rate1_action
+};
+
+static DB_plugin_action_t *
+rating_get_actions (DB_playItem_t *it)
+{
+    return &rate0_action;
+}
+
+static DB_misc_t plugin = {
+    .plugin.api_vmajor = 1,
+    .plugin.api_vminor = 5,
+    .plugin.version_major = 1,
+    .plugin.version_minor = 0,
+    .plugin.type = DB_PLUGIN_MISC,
+    .plugin.name = "rating",
+    .plugin.descr = "Enables commands to rate song(s) by editing the metadata tag rating.",
+    .plugin.copyright =
+        "Rating plugin for DeaDBeeF Player\n"
+        "Author: Christian Hernvall\n"
+        "\n"
+        "This program is free software; you can redistribute it and/or\n"
+        "modify it under the terms of the GNU General Public License\n"
+        "as published by the Free Software Foundation; either version 2\n"
+        "of the License, or (at your option) any later version.\n"
+        "\n"
+        "This program is distributed in the hope that it will be useful,\n"
+        "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
+        "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
+        "GNU General Public License for more details.\n"
+        "\n"
+        "You should have received a copy of the GNU General Public License\n"
+        "along with this program; if not, write to the Free Software\n"
+        "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.\n"
+    ,
+    .plugin.website = "http://deadbeef.sf.net",
+    .plugin.start = rating_start,
+    .plugin.stop = rating_stop,
+    .plugin.get_actions = rating_get_actions,
+};