aboutsummaryrefslogtreecommitdiffstats
path: root/src/playlist/cue
diff options
context:
space:
mode:
Diffstat (limited to 'src/playlist/cue')
-rw-r--r--src/playlist/cue/CueParser.cxx318
-rw-r--r--src/playlist/cue/CueParser.hxx144
2 files changed, 462 insertions, 0 deletions
diff --git a/src/playlist/cue/CueParser.cxx b/src/playlist/cue/CueParser.cxx
new file mode 100644
index 000000000..dc96218f4
--- /dev/null
+++ b/src/playlist/cue/CueParser.cxx
@@ -0,0 +1,318 @@
+/*
+ * Copyright (C) 2003-2014 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 "CueParser.hxx"
+#include "util/Alloc.hxx"
+#include "util/StringUtil.hxx"
+#include "util/CharUtil.hxx"
+#include "DetachedSong.hxx"
+#include "tag/Tag.hxx"
+
+#include <assert.h>
+#include <string.h>
+#include <stdlib.h>
+
+CueParser::CueParser()
+ :state(HEADER),
+ current(nullptr),
+ previous(nullptr),
+ finished(nullptr),
+ end(false) {}
+
+CueParser::~CueParser()
+{
+ delete current;
+ delete previous;
+ delete finished;
+}
+
+static const char *
+cue_next_word(char *p, char **pp)
+{
+ assert(p >= *pp);
+ assert(!IsWhitespaceNotNull(*p));
+
+ const char *word = p;
+ while (!IsWhitespaceOrNull(*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 == nullptr) {
+ /* 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 nullptr;
+
+ return cue_next_word(p, pp);
+}
+
+static const char *
+cue_next_value(char **pp)
+{
+ char *p = strchug_fast(*pp);
+ if (*p == 0)
+ return nullptr;
+
+ if (*p == '"')
+ return cue_next_quoted(p + 1, pp);
+ else
+ return cue_next_word(p, pp);
+}
+
+static void
+cue_add_tag(TagBuilder &tag, TagType type, char *p)
+{
+ const char *value = cue_next_value(&p);
+ if (value != nullptr)
+ tag.AddItem(type, value);
+
+}
+
+static void
+cue_parse_rem(char *p, TagBuilder &tag)
+{
+ const char *type = cue_next_token(&p);
+ if (type == nullptr)
+ return;
+
+ TagType type2 = tag_name_parse_i(type);
+ if (type2 != TAG_NUM_OF_ITEM_TYPES)
+ cue_add_tag(tag, type2, p);
+}
+
+TagBuilder *
+CueParser::GetCurrentTag()
+{
+ if (state == HEADER)
+ return &header_tag;
+ else if (state == TRACK)
+ return &song_tag;
+ else
+ return nullptr;
+}
+
+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;
+}
+
+void
+CueParser::Commit()
+{
+ /* the caller of this library must call cue_parser_get() often
+ enough */
+ assert(finished == nullptr);
+ assert(!end);
+
+ if (current == nullptr)
+ return;
+
+ assert(!current->GetTag().IsDefined());
+ current->SetTag(song_tag.Commit());
+
+ finished = previous;
+ previous = current;
+ current = nullptr;
+}
+
+void
+CueParser::Feed2(char *p)
+{
+ assert(!end);
+ assert(p != nullptr);
+
+ const char *command = cue_next_token(&p);
+ if (command == nullptr)
+ return;
+
+ if (strcmp(command, "REM") == 0) {
+ TagBuilder *tag = GetCurrentTag();
+ if (tag != nullptr)
+ cue_parse_rem(p, *tag);
+ } else if (strcmp(command, "PERFORMER") == 0) {
+ /* MPD knows a "performer" tag, but it is not a good
+ match for this CUE tag; from the Hydrogenaudio
+ Knowledgebase: "At top-level this will specify the
+ CD artist, while at track-level it specifies the
+ track artist." */
+
+ TagType type = state == TRACK
+ ? TAG_ARTIST
+ : TAG_ALBUM_ARTIST;
+
+ TagBuilder *tag = GetCurrentTag();
+ if (tag != nullptr)
+ cue_add_tag(*tag, type, p);
+ } else if (strcmp(command, "TITLE") == 0) {
+ if (state == HEADER)
+ cue_add_tag(header_tag, TAG_ALBUM, p);
+ else if (state == TRACK)
+ cue_add_tag(song_tag, TAG_TITLE, p);
+ } else if (strcmp(command, "FILE") == 0) {
+ Commit();
+
+ const char *new_filename = cue_next_value(&p);
+ if (new_filename == nullptr)
+ return;
+
+ const char *type = cue_next_token(&p);
+ if (type == nullptr)
+ return;
+
+ if (strcmp(type, "WAVE") != 0 &&
+ strcmp(type, "MP3") != 0 &&
+ strcmp(type, "AIFF") != 0) {
+ state = IGNORE_FILE;
+ return;
+ }
+
+ state = WAVE;
+ filename = new_filename;
+ } else if (state == IGNORE_FILE) {
+ return;
+ } else if (strcmp(command, "TRACK") == 0) {
+ Commit();
+
+ const char *nr = cue_next_token(&p);
+ if (nr == nullptr)
+ return;
+
+ const char *type = cue_next_token(&p);
+ if (type == nullptr)
+ return;
+
+ if (strcmp(type, "AUDIO") != 0) {
+ state = IGNORE_TRACK;
+ return;
+ }
+
+ state = TRACK;
+ current = new DetachedSong(filename);
+ assert(!current->GetTag().IsDefined());
+
+ song_tag = header_tag;
+ song_tag.AddItem(TAG_TRACK, nr);
+
+ last_updated = false;
+ } else if (state == IGNORE_TRACK) {
+ return;
+ } else if (state == TRACK && strcmp(command, "INDEX") == 0) {
+ const char *nr = cue_next_token(&p);
+ if (nr == nullptr)
+ return;
+
+ const char *position = cue_next_token(&p);
+ if (position == nullptr)
+ return;
+
+ int position_ms = cue_parse_position(position);
+ if (position_ms < 0)
+ return;
+
+ if (!last_updated && previous != nullptr &&
+ previous->GetStartMS() < (unsigned)position_ms) {
+ last_updated = true;
+ previous->SetEndMS(position_ms);
+ previous->WritableTag().time =
+ (previous->GetEndMS() - previous->GetStartMS() + 500) / 1000;
+ }
+
+ current->SetStartMS(position_ms);
+ }
+}
+
+void
+CueParser::Feed(const char *line)
+{
+ assert(!end);
+ assert(line != nullptr);
+
+ char *allocated = xstrdup(line);
+ Feed2(allocated);
+ free(allocated);
+}
+
+void
+CueParser::Finish()
+{
+ if (end)
+ /* has already been called, ignore */
+ return;
+
+ Commit();
+ end = true;
+}
+
+DetachedSong *
+CueParser::Get()
+{
+ if (finished == nullptr && end) {
+ /* cue_parser_finish() has been called already:
+ deliver all remaining (partial) results */
+ assert(current == nullptr);
+
+ finished = previous;
+ previous = nullptr;
+ }
+
+ DetachedSong *song = finished;
+ finished = nullptr;
+ return song;
+}
diff --git a/src/playlist/cue/CueParser.hxx b/src/playlist/cue/CueParser.hxx
new file mode 100644
index 000000000..7e040169b
--- /dev/null
+++ b/src/playlist/cue/CueParser.hxx
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2003-2014 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_HXX
+#define MPD_CUE_PARSER_HXX
+
+#include "check.h"
+#include "tag/TagBuilder.hxx"
+#include "Compiler.h"
+
+#include <string>
+
+class DetachedSong;
+struct Tag;
+
+class CueParser {
+ 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;
+
+ /**
+ * Tags read from the CUE header.
+ */
+ TagBuilder header_tag;
+
+ /**
+ * Tags read for the current song (attribute #current). When
+ * #current gets moved to #previous, TagBuilder::Commit() will
+ * be called.
+ */
+ TagBuilder song_tag;
+
+ std::string filename;
+
+ /**
+ * The song currently being edited.
+ */
+ DetachedSong *current;
+
+ /**
+ * The previous song. It is remembered because its end_time
+ * will be set to the current song's start time.
+ */
+ DetachedSong *previous;
+
+ /**
+ * A song that is completely finished and can be returned to
+ * the caller via cue_parser_get().
+ */
+ DetachedSong *finished;
+
+ /**
+ * Set to true after previous.end_time has been updated to the
+ * start time of the current song.
+ */
+ bool last_updated;
+
+ /**
+ * Tracks whether cue_parser_finish() has been called. If
+ * true, then all remaining (partial) results will be
+ * delivered by cue_parser_get().
+ */
+ bool end;
+
+public:
+ CueParser();
+ ~CueParser();
+
+ /**
+ * 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 Feed(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 Finish();
+
+ /**
+ * 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
+ */
+ DetachedSong *Get();
+
+private:
+ gcc_pure
+ TagBuilder *GetCurrentTag();
+
+ /**
+ * Commit the current song. It will be moved to "previous",
+ * so the next song may soon edit its end time (using the next
+ * song's start time).
+ */
+ void Commit();
+
+ void Feed2(char *p);
+};
+
+#endif