From abcc225763e543b75baaa4ff11342e911194910d Mon Sep 17 00:00:00 2001 From: Max Kellermann Date: Fri, 10 Feb 2012 00:12:29 +0100 Subject: cue_parser: new line based CUE sheet parser To replace libcue, the unmaintained and crashy library. --- src/cue/cue_parser.c | 327 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 327 insertions(+) create mode 100644 src/cue/cue_parser.c (limited to 'src/cue/cue_parser.c') 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 +#include + +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; +} -- cgit v1.2.3