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authorMax Kellermann <max@duempel.org>2012-02-10 00:12:29 +0100
committerMax Kellermann <max@duempel.org>2012-02-10 00:12:29 +0100
commitabcc225763e543b75baaa4ff11342e911194910d (patch)
treec278ea61339d0a7c5ab1ed00881a15751c29b2c4 /src/cue/cue_parser.c
parentb9673fc521c453f8729544541ba48fcafefcf4e9 (diff)
downloadmpd-abcc225763e543b75baaa4ff11342e911194910d.tar.gz
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cue_parser: new line based CUE sheet parser
To replace libcue, the unmaintained and crashy library.
Diffstat (limited to 'src/cue/cue_parser.c')
-rw-r--r--src/cue/cue_parser.c327
1 files changed, 327 insertions, 0 deletions
diff --git a/src/cue/cue_parser.c b/src/cue/cue_parser.c
new file mode 100644
index 000000000..034d4a1f9
--- /dev/null
+++ b/src/cue/cue_parser.c
@@ -0,0 +1,327 @@
+/*
+ * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "cue_parser.h"
+#include "string_util.h"
+#include "song.h"
+#include "tag.h"
+
+#include <assert.h>
+#include <stdlib.h>
+
+struct cue_parser {
+ enum {
+ /**
+ * Parsing the CUE header.
+ */
+ HEADER,
+
+ /**
+ * Parsing a "FILE ... WAVE".
+ */
+ WAVE,
+
+ /**
+ * Ignore everything until the next "FILE".
+ */
+ IGNORE_FILE,
+
+ /**
+ * Parsing a "TRACK ... AUDIO".
+ */
+ TRACK,
+
+ /**
+ * Ignore everything until the next "TRACK".
+ */
+ IGNORE_TRACK,
+ } state;
+
+ struct tag *tag;
+
+ char *filename;
+
+ struct song *current, *previous, *finished;
+
+ bool last_updated;
+};
+
+struct cue_parser *
+cue_parser_new(void)
+{
+ struct cue_parser *parser = g_new(struct cue_parser, 1);
+ parser->state = HEADER;
+ parser->tag = tag_new();
+ parser->filename = NULL;
+ parser->current = NULL;
+ parser->previous = NULL;
+ parser->finished = NULL;
+ return parser;
+}
+
+void
+cue_parser_free(struct cue_parser *parser)
+{
+ tag_free(parser->tag);
+ g_free(parser->filename);
+
+ if (parser->current != NULL)
+ song_free(parser->current);
+
+ if (parser->finished != NULL)
+ song_free(parser->finished);
+
+ g_free(parser);
+}
+
+static const char *
+cue_next_word(char *p, char **pp)
+{
+ assert(p >= *pp);
+ assert(!g_ascii_isspace(*p));
+
+ const char *word = p;
+ while (*p != 0 && !g_ascii_isspace(*p))
+ ++p;
+
+ *p = 0;
+ *pp = p + 1;
+ return word;
+}
+
+static const char *
+cue_next_quoted(char *p, char **pp)
+{
+ assert(p >= *pp);
+ assert(p[-1] == '"');
+
+ char *end = strchr(p, '"');
+ if (end == NULL) {
+ /* syntax error - ignore it silently */
+ *pp = p + strlen(p);
+ return p;
+ }
+
+ *end = 0;
+ *pp = end + 1;
+
+ return p;
+}
+
+static const char *
+cue_next_token(char **pp)
+{
+ char *p = strchug_fast(*pp);
+ if (*p == 0)
+ return NULL;
+
+ return cue_next_word(p, pp);
+}
+
+static const char *
+cue_next_value(char **pp)
+{
+ char *p = strchug_fast(*pp);
+ if (*p == 0)
+ return NULL;
+
+ if (*p == '"')
+ return cue_next_quoted(p + 1, pp);
+ else
+ return cue_next_word(p, pp);
+}
+
+static void
+cue_add_tag(struct tag *tag, enum tag_type type, char *p)
+{
+ const char *value = cue_next_value(&p);
+ if (value != NULL)
+ tag_add_item(tag, type, value);
+
+}
+
+static void
+cue_parse_rem(char *p, struct tag *tag)
+{
+ const char *type = cue_next_token(&p);
+ if (type == NULL)
+ return;
+
+ enum tag_type type2 = tag_name_parse_i(type);
+ if (type2 != TAG_NUM_OF_ITEM_TYPES)
+ cue_add_tag(tag, type2, p);
+}
+
+static struct tag *
+cue_current_tag(struct cue_parser *parser)
+{
+ if (parser->state == HEADER)
+ return parser->tag;
+ else if (parser->state == TRACK)
+ return parser->current->tag;
+ else
+ return NULL;
+}
+
+static int
+cue_parse_position(const char *p)
+{
+ char *endptr;
+ unsigned long minutes = strtoul(p, &endptr, 10);
+ if (endptr == p || *endptr != ':')
+ return -1;
+
+ p = endptr + 1;
+ unsigned long seconds = strtoul(p, &endptr, 10);
+ if (endptr == p || *endptr != ':')
+ return -1;
+
+ p = endptr + 1;
+ unsigned long frames = strtoul(p, &endptr, 10);
+ if (endptr == p || *endptr != 0)
+ return -1;
+
+ return minutes * 60000 + seconds * 1000 + frames * 1000 / 75;
+}
+
+static void
+cue_parser_feed2(struct cue_parser *parser, char *p)
+{
+ assert(parser != NULL);
+ assert(p != NULL);
+
+ const char *command = cue_next_token(&p);
+ if (command == NULL)
+ return;
+
+ if (strcmp(command, "REM") == 0) {
+ struct tag *tag = cue_current_tag(parser);
+ if (tag != NULL)
+ cue_parse_rem(p, tag);
+ } else if (strcmp(command, "PERFORMER") == 0) {
+ struct tag *tag = cue_current_tag(parser);
+ if (tag != NULL)
+ cue_add_tag(tag, TAG_PERFORMER, p);
+ } else if (strcmp(command, "TITLE") == 0) {
+ if (parser->state == HEADER)
+ cue_add_tag(parser->tag, TAG_ALBUM, p);
+ else if (parser->state == TRACK)
+ cue_add_tag(parser->current->tag, TAG_TITLE, p);
+ } else if (strcmp(command, "FILE") == 0) {
+ cue_parser_finish(parser);
+
+ const char *filename = cue_next_value(&p);
+ if (filename == NULL)
+ return;
+
+ const char *type = cue_next_token(&p);
+ if (type == NULL)
+ return;
+
+ if (strcmp(type, "WAVE") != 0) {
+ parser->state = IGNORE_FILE;
+ return;
+ }
+
+ parser->state = WAVE;
+ g_free(parser->filename);
+ parser->filename = g_strdup(filename);
+ } else if (parser->state == IGNORE_FILE) {
+ return;
+ } else if (strcmp(command, "TRACK") == 0) {
+ cue_parser_finish(parser);
+
+ const char *nr = cue_next_token(&p);
+ if (nr == NULL)
+ return;
+
+ const char *type = cue_next_token(&p);
+ if (type == NULL)
+ return;
+
+ if (strcmp(type, "AUDIO") != 0) {
+ parser->state = IGNORE_TRACK;
+ return;
+ }
+
+ parser->state = TRACK;
+ parser->current = song_remote_new(parser->filename);
+ assert(parser->current->tag == NULL);
+ parser->current->tag = tag_dup(parser->tag);
+ tag_add_item(parser->current->tag, TAG_TRACK, nr);
+ parser->last_updated = false;
+ } else if (parser->state == IGNORE_TRACK) {
+ return;
+ } else if (parser->state == TRACK && strcmp(command, "INDEX") == 0) {
+ const char *nr = cue_next_token(&p);
+ if (nr == NULL)
+ return;
+
+ const char *position = cue_next_token(&p);
+ if (position == NULL)
+ return;
+
+ int position_ms = cue_parse_position(position);
+ if (position_ms < 0)
+ return;
+
+ if (!parser->last_updated && parser->previous != NULL &&
+ parser->previous->start_ms < (unsigned)position_ms) {
+ parser->last_updated = true;
+ parser->previous->end_ms = position_ms;
+ parser->previous->tag->time =
+ (parser->previous->end_ms - parser->previous->start_ms + 500) / 1000;
+ }
+
+ parser->current->start_ms = position_ms;
+ }
+}
+
+void
+cue_parser_feed(struct cue_parser *parser, const char *line)
+{
+ assert(parser != NULL);
+ assert(line != NULL);
+
+ char *allocated = g_strdup(line);
+ cue_parser_feed2(parser, allocated);
+ g_free(allocated);
+}
+
+void
+cue_parser_finish(struct cue_parser *parser)
+{
+ if (parser->finished != NULL)
+ song_free(parser->finished);
+
+ parser->finished = parser->previous;
+ parser->previous = parser->current;
+ parser->current = NULL;
+}
+
+struct song *
+cue_parser_get(struct cue_parser *parser)
+{
+ assert(parser != NULL);
+
+ struct song *song = parser->finished;
+ parser->finished = NULL;
+ return song;
+}