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cue_parser: new line based CUE sheet parser

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To replace libcue, the unmaintained and crashy library.
This commit is contained in:
Max Kellermann
2012-02-10 00:12:29 +01:00
parent b9673fc521
commit abcc225763
9 changed files with 420 additions and 359 deletions
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327
src/cue/cue_parser.c Normal file
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/*
* 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;
}

58
src/cue/cue_parser.h Normal file
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/*
* 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.
*/
#ifndef MPD_CUE_PARSER_H
#define MPD_CUE_PARSER_H
#include "check.h"
#include <stdbool.h>
struct cue_parser *
cue_parser_new(void);
void
cue_parser_free(struct cue_parser *parser);
/**
* Feed a text line from the CUE file into the parser. Call
* cue_parser_get() after this to see if a song has been finished.
*/
void
cue_parser_feed(struct cue_parser *parser, const char *line);
/**
* Tell the parser that the end of the file has been reached. Call
* cue_parser_get() after this to see if a song has been finished.
* This procedure must be done twice!
*/
void
cue_parser_finish(struct cue_parser *parser);
/**
* Check if a song was finished by the last cue_parser_feed() or
* cue_parser_finish() call.
*
* @return a song object that must be freed by the caller, or NULL if
* no song was finished at this time
*/
struct song *
cue_parser_get(struct cue_parser *parser);
#endif

244
src/cue/cue_tag.c
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#include "config.h"
#include "cue_tag.h"
#include "tag.h"
#include <libcue/libcue.h>
#include <assert.h>
static struct tag *
cue_tag_cd(struct Cdtext *cdtext, struct Rem *rem)
{
struct tag *tag;
char *tmp;
assert(cdtext != NULL);
tag = tag_new();
tag_begin_add(tag);
/* TAG_ALBUM_ARTIST */
if ((tmp = cdtext_get(PTI_PERFORMER, cdtext)) != NULL)
tag_add_item(tag, TAG_ALBUM_ARTIST, tmp);
else if ((tmp = cdtext_get(PTI_SONGWRITER, cdtext)) != NULL)
tag_add_item(tag, TAG_ALBUM_ARTIST, tmp);
else if ((tmp = cdtext_get(PTI_COMPOSER, cdtext)) != NULL)
tag_add_item(tag, TAG_ALBUM_ARTIST, tmp);
else if ((tmp = cdtext_get(PTI_ARRANGER, cdtext)) != NULL)
tag_add_item(tag, TAG_ALBUM_ARTIST, tmp);
/* TAG_ARTIST */
if ((tmp = cdtext_get(PTI_PERFORMER, cdtext)) != NULL)
tag_add_item(tag, TAG_ARTIST, tmp);
else if ((tmp = cdtext_get(PTI_SONGWRITER, cdtext)) != NULL)
tag_add_item(tag, TAG_ARTIST, tmp);
else if ((tmp = cdtext_get(PTI_COMPOSER, cdtext)) != NULL)
tag_add_item(tag, TAG_ARTIST, tmp);
else if ((tmp = cdtext_get(PTI_ARRANGER, cdtext)) != NULL)
tag_add_item(tag, TAG_ARTIST, tmp);
/* TAG_PERFORMER */
if ((tmp = cdtext_get(PTI_PERFORMER, cdtext)) != NULL)
tag_add_item(tag, TAG_PERFORMER, tmp);
/* TAG_COMPOSER */
if ((tmp = cdtext_get(PTI_COMPOSER, cdtext)) != NULL)
tag_add_item(tag, TAG_COMPOSER, tmp);
/* TAG_ALBUM */
if ((tmp = cdtext_get(PTI_TITLE, cdtext)) != NULL)
tag_add_item(tag, TAG_ALBUM, tmp);
/* TAG_GENRE */
if ((tmp = cdtext_get(PTI_GENRE, cdtext)) != NULL)
tag_add_item(tag, TAG_GENRE, tmp);
/* TAG_DATE */
if ((tmp = rem_get(REM_DATE, rem)) != NULL)
tag_add_item(tag, TAG_DATE, tmp);
/* TAG_COMMENT */
if ((tmp = cdtext_get(PTI_MESSAGE, cdtext)) != NULL)
tag_add_item(tag, TAG_COMMENT, tmp);
/* TAG_DISC */
if ((tmp = cdtext_get(PTI_DISC_ID, cdtext)) != NULL)
tag_add_item(tag, TAG_DISC, tmp);
/* stream name, usually empty
* tag_add_item(tag, TAG_NAME,);
*/
/* REM MUSICBRAINZ entry?
tag_add_item(tag, TAG_MUSICBRAINZ_ARTISTID,);
tag_add_item(tag, TAG_MUSICBRAINZ_ALBUMID,);
tag_add_item(tag, TAG_MUSICBRAINZ_ALBUMARTISTID,);
tag_add_item(tag, TAG_MUSICBRAINZ_TRACKID,);
*/
tag_end_add(tag);
if (tag_is_empty(tag)) {
tag_free(tag);
return NULL;
}
return tag;
}
static struct tag *
cue_tag_track(struct Cdtext *cdtext, struct Rem *rem)
{
struct tag *tag;
char *tmp;
assert(cdtext != NULL);
tag = tag_new();
tag_begin_add(tag);
/* TAG_ARTIST */
if ((tmp = cdtext_get(PTI_PERFORMER, cdtext)) != NULL)
tag_add_item(tag, TAG_ARTIST, tmp);
else if ((tmp = cdtext_get(PTI_SONGWRITER, cdtext)) != NULL)
tag_add_item(tag, TAG_ARTIST, tmp);
else if ((tmp = cdtext_get(PTI_COMPOSER, cdtext)) != NULL)
tag_add_item(tag, TAG_ARTIST, tmp);
else if ((tmp = cdtext_get(PTI_ARRANGER, cdtext)) != NULL)
tag_add_item(tag, TAG_ARTIST, tmp);
/* TAG_TITLE */
if ((tmp = cdtext_get(PTI_TITLE, cdtext)) != NULL)
tag_add_item(tag, TAG_TITLE, tmp);
/* TAG_GENRE */
if ((tmp = cdtext_get(PTI_GENRE, cdtext)) != NULL)
tag_add_item(tag, TAG_GENRE, tmp);
/* TAG_DATE */
if ((tmp = rem_get(REM_DATE, rem)) != NULL)
tag_add_item(tag, TAG_DATE, tmp);
/* TAG_COMPOSER */
if ((tmp = cdtext_get(PTI_COMPOSER, cdtext)) != NULL)
tag_add_item(tag, TAG_COMPOSER, tmp);
/* TAG_PERFORMER */
if ((tmp = cdtext_get(PTI_PERFORMER, cdtext)) != NULL)
tag_add_item(tag, TAG_PERFORMER, tmp);
/* TAG_COMMENT */
if ((tmp = cdtext_get(PTI_MESSAGE, cdtext)) != NULL)
tag_add_item(tag, TAG_COMMENT, tmp);
/* TAG_DISC */
if ((tmp = cdtext_get(PTI_DISC_ID, cdtext)) != NULL)
tag_add_item(tag, TAG_DISC, tmp);
tag_end_add(tag);
if (tag_is_empty(tag)) {
tag_free(tag);
return NULL;
}
return tag;
}
struct tag *
cue_tag(struct Cd *cd, unsigned tnum)
{
struct tag *cd_tag, *track_tag, *tag;
struct Track *track;
assert(cd != NULL);
track = cd_get_track(cd, tnum);
if (track == NULL)
return NULL;
/* tag from CDtext info */
cd_tag = cue_tag_cd(cd_get_cdtext(cd), cd_get_rem(cd));
/* tag from TRACKtext info */
track_tag = cue_tag_track(track_get_cdtext(track),
track_get_rem(track));
tag = tag_merge_replace(cd_tag, track_tag);
if (tag == NULL)
return NULL;
/* Create a tag number */
tag_clear_items_by_type(tag, TAG_TRACK);
char convert_uinttostring[8];
snprintf(convert_uinttostring, sizeof(convert_uinttostring),
"%02d/%02d", tnum, cd_get_ntrack(cd));
tag_add_item(tag, TAG_TRACK, convert_uinttostring);
tag->time = track_get_length(track)
- track_get_index(track, 1)
+ track_get_zero_pre(track);
track = cd_get_track(cd, tnum + 1);
if (track != NULL)
tag->time += track_get_index(track, 1)
- track_get_zero_pre(track);
/* libcue returns the track duration in frames, and there are
75 frames per second; this formula rounds down */
tag->time = tag->time / 75;
return tag;
}
struct tag *
cue_tag_file(FILE *fp, unsigned tnum)
{
struct Cd *cd;
struct tag *tag;
assert(fp != NULL);
if (tnum > 256)
return NULL;
cd = cue_parse_file(fp);
if (cd == NULL)
return NULL;
tag = cue_tag(cd, tnum);
cd_delete(cd);
return tag;
}
struct tag *
cue_tag_string(const char *str, unsigned tnum)
{
struct Cd *cd;
struct tag *tag;
assert(str != NULL);
if (tnum > 256)
return NULL;
cd = cue_parse_string(str);
if (cd == NULL)
return NULL;
tag = cue_tag(cd, tnum);
cd_delete(cd);
return tag;
}

23
src/cue/cue_tag.h
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#ifndef MPD_CUE_TAG_H
#define MPD_CUE_TAG_H
#include "check.h"
#ifdef HAVE_CUE /* libcue */
#include <stdio.h>
struct tag;
struct Cd;
struct tag *
cue_tag(struct Cd *cd, unsigned tnum);
struct tag *
cue_tag_file(FILE *file, unsigned tnum);
struct tag *
cue_tag_string(const char *str, unsigned tnum);
#endif /* libcue */
#endif