playlist/embcue: new plugin for reading embedded cue sheets

Parses CUE data from the "CUESHEET" tag.  Needs further integration in
the update thread.

Makefile.am

@@ -336,6 +336,7 @@ src_mpd_SOURCES = \
 	src/tag_print.c \
 	src/tag_save.c \
 	src/tag_handler.c src/tag_handler.h \
+	src/tag_file.c src/tag_file.h \
 	src/tokenizer.c \
 	src/text_file.c \
 	src/text_input_stream.c \
@@ -864,6 +865,8 @@ libplaylist_plugins_a_SOURCES = \
 	src/playlist/asx_playlist_plugin.c \
 	src/playlist/rss_playlist_plugin.c \
 	src/playlist/cue_playlist_plugin.c \
+	src/playlist/embcue_playlist_plugin.c \
+	src/playlist/embcue_playlist_plugin.h \
 	src/playlist_list.c
 libplaylist_plugins_a_CPPFLAGS = $(AM_CPPFLAGS) \
 	$(patsubst -I%/FLAC,-I%,$(FLAC_CFLAGS))
@@ -1001,15 +1004,20 @@ test_dump_playlist_LDADD = \
 	$(FLAC_LIBS) \
 	$(INPUT_LIBS) \
 	$(ARCHIVE_LIBS) \
+	$(DECODER_LIBS) \
+	$(TAG_LIBS) \
 	$(GLIB_LIBS)
 test_dump_playlist_SOURCES = test/dump_playlist.c \
+	$(DECODER_SRC) \
 	src/io_thread.c src/io_thread.h \
 	src/conf.c src/tokenizer.c src/utils.c src/string_util.c\
 	src/uri.c \
 	src/song.c src/tag.c src/tag_pool.c src/tag_save.c \
-	src/tag_handler.c \
+	src/tag_handler.c src/tag_file.c \
+	src/audio_check.c src/pcm_buffer.c \
 	src/text_input_stream.c src/fifo_buffer.c \
 	src/cue/cue_parser.c src/cue/cue_parser.h \
+	src/timer.c \
 	src/fd_util.c
 
 if HAVE_FLAC

doc/user.xml

@@ -1789,6 +1789,14 @@ cd mpd-version</programlisting>
         </informaltable>
       </section>
 
+      <section>
+        <title><varname>embcue</varname></title>
+
+        <para>
+          Reads CUE sheets from the "CUESHEET" tag of song files.
+        </para>
+      </section>
+
       <section>
         <title><varname>m3u</varname></title>
 

src/playlist/embcue_playlist_plugin.c

@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 2003-2012 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.
+ */
+
+/** \file
+ *
+ * Playlist plugin that reads embedded cue sheets from the "CUESHEET"
+ * tag of a music file.
+ */
+
+#include "config.h"
+#include "playlist/embcue_playlist_plugin.h"
+#include "playlist_plugin.h"
+#include "tag.h"
+#include "tag_handler.h"
+#include "tag_file.h"
+#include "tag_ape.h"
+#include "tag_id3.h"
+#include "song.h"
+#include "cue/cue_parser.h"
+
+#include <glib.h>
+#include <assert.h>
+#include <string.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "cue"
+
+struct embcue_playlist {
+	struct playlist_provider base;
+
+	/**
+	 * The value of the file's "CUESHEET" tag.
+	 */
+	char *cuesheet;
+
+	/**
+	 * The offset of the next line within "cuesheet".
+	 */
+	char *next;
+
+	struct cue_parser *parser;
+};
+
+static void
+embcue_tag_pair(const char *name, const char *value, void *ctx)
+{
+	struct embcue_playlist *playlist = ctx;
+
+	if (playlist->cuesheet == NULL &&
+	    g_ascii_strcasecmp(name, "cuesheet") == 0)
+		playlist->cuesheet = g_strdup(value);
+}
+
+static const struct tag_handler embcue_tag_handler = {
+	.pair = embcue_tag_pair,
+};
+
+static struct playlist_provider *
+embcue_playlist_open_uri(const char *uri,
+			 G_GNUC_UNUSED GMutex *mutex,
+			 G_GNUC_UNUSED GCond *cond)
+{
+	if (!g_path_is_absolute(uri))
+		/* only local files supported */
+		return NULL;
+
+	struct embcue_playlist *playlist = g_new(struct embcue_playlist, 1);
+	playlist_provider_init(&playlist->base, &embcue_playlist_plugin);
+	playlist->cuesheet = NULL;
+
+	tag_file_scan(uri, &embcue_tag_handler, playlist);
+	if (playlist->cuesheet == NULL) {
+		tag_ape_scan2(uri, &embcue_tag_handler, playlist);
+		if (playlist->cuesheet == NULL)
+			tag_id3_scan(uri, &embcue_tag_handler, playlist);
+	}
+
+	if (playlist->cuesheet == NULL) {
+		/* no "CUESHEET" tag found */
+		g_free(playlist);
+		return NULL;
+	}
+
+	playlist->next = playlist->cuesheet;
+	playlist->parser = cue_parser_new();
+
+	return &playlist->base;
+}
+
+static void
+embcue_playlist_close(struct playlist_provider *_playlist)
+{
+	struct embcue_playlist *playlist = (struct embcue_playlist *)_playlist;
+
+	cue_parser_free(playlist->parser);
+	g_free(playlist->cuesheet);
+	g_free(playlist);
+}
+
+static struct song *
+embcue_playlist_read(struct playlist_provider *_playlist)
+{
+	struct embcue_playlist *playlist = (struct embcue_playlist *)_playlist;
+
+	struct song *song = cue_parser_get(playlist->parser);
+	if (song != NULL)
+		return song;
+
+	while (*playlist->next != 0) {
+		const char *line = playlist->next;
+		char *eol = strpbrk(playlist->next, "\r\n");
+		if (eol != NULL) {
+			/* null-terminate the line */
+			*eol = 0;
+			playlist->next = eol + 1;
+		} else
+			/* last line; put the "next" pointer to the
+			   end of the buffer */
+			playlist->next += strlen(line);
+
+		cue_parser_feed(playlist->parser, line);
+		song = cue_parser_get(playlist->parser);
+		if (song != NULL)
+			return song;
+	}
+
+	cue_parser_finish(playlist->parser);
+	return cue_parser_get(playlist->parser);
+}
+
+static const char *const embcue_playlist_suffixes[] = {
+	/* a few codecs that are known to be supported; there are
+	   probably many more */
+	"flac",
+	"mp3", "mp2",
+	"mp4", "mp4a", "m4b",
+	"ape",
+	"wv",
+	"ogg", "oga",
+	NULL
+};
+
+const struct playlist_plugin embcue_playlist_plugin = {
+	.name = "cue",
+
+	.open_uri = embcue_playlist_open_uri,
+	.close = embcue_playlist_close,
+	.read = embcue_playlist_read,
+
+	.suffixes = embcue_playlist_suffixes,
+	.mime_types = NULL,
+};

src/playlist/embcue_playlist_plugin.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2003-2012 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_PLAYLIST_EMBCUE_PLAYLIST_PLUGIN_H
+#define MPD_PLAYLIST_EMBCUE_PLAYLIST_PLUGIN_H
+
+extern const struct playlist_plugin embcue_playlist_plugin;
+
+#endif

src/playlist_list.c

@@ -29,6 +29,7 @@
 #include "playlist/asx_playlist_plugin.h"
 #include "playlist/rss_playlist_plugin.h"
 #include "playlist/cue_playlist_plugin.h"
+#include "playlist/embcue_playlist_plugin.h"
 #include "playlist/flac_playlist_plugin.h"
 #include "input_stream.h"
 #include "uri.h"
@@ -55,6 +56,7 @@ static const struct playlist_plugin *const playlist_plugins[] = {
 	&lastfm_playlist_plugin,
 #endif
 	&cue_playlist_plugin,
+	&embcue_playlist_plugin,
 #ifdef HAVE_FLAC
 	&flac_playlist_plugin,
 #endif

src/tag_file.c

@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2003-2012 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 "tag_file.h"
+#include "uri.h"
+#include "decoder_list.h"
+#include "decoder_plugin.h"
+#include "input_stream.h"
+
+#include <assert.h>
+#include <unistd.h> /* for SEEK_SET */
+
+bool
+tag_file_scan(const char *path_fs,
+	      const struct tag_handler *handler, void *handler_ctx)
+{
+	assert(path_fs != NULL);
+	assert(handler != NULL);
+
+	/* check if there's a suffix and a plugin */
+
+	const char *suffix = uri_get_suffix(path_fs);
+	if (suffix == NULL)
+		return false;
+
+	const struct decoder_plugin *plugin =
+		decoder_plugin_from_suffix(suffix, NULL);
+	if (plugin == NULL)
+		return false;
+
+	struct input_stream *is = NULL;
+	GMutex *mutex = NULL;
+	GCond *cond = NULL;
+
+	do {
+		/* load file tag */
+		if (decoder_plugin_scan_file(plugin, path_fs,
+					     handler, handler_ctx))
+			break;
+
+		/* fall back to stream tag */
+		if (plugin->scan_stream != NULL) {
+			/* open the input_stream (if not already
+			   open) */
+			if (is == NULL) {
+				mutex = g_mutex_new();
+				cond = g_cond_new();
+				is = input_stream_open(path_fs, mutex, cond,
+						       NULL);
+			}
+
+			/* now try the stream_tag() method */
+			if (is != NULL) {
+				if (decoder_plugin_scan_stream(plugin, is,
+							       handler,
+							       handler_ctx))
+					break;
+
+				input_stream_lock_seek(is, 0, SEEK_SET, NULL);
+			}
+		}
+
+		plugin = decoder_plugin_from_suffix(suffix, plugin);
+	} while (plugin != NULL);
+
+	if (is != NULL) {
+		input_stream_close(is);
+		g_cond_free(cond);
+		g_mutex_free(mutex);
+	}
+
+	return plugin != NULL;
+}

src/tag_file.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2003-2012 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_TAG_FILE_H
+#define MPD_TAG_FILE_H
+
+#include "check.h"
+
+#include <stdbool.h>
+
+struct tag_handler;
+
+/**
+ * Scan the tags of a song file.  Invokes matching decoder plugins,
+ * but does not invoke the special "APE" and "ID3" scanners.
+ */
+bool
+tag_file_scan(const char *path_fs,
+	      const struct tag_handler *handler, void *handler_ctx);
+
+#endif

test/dump_playlist.c

@@ -25,6 +25,8 @@
 #include "tag_save.h"
 #include "conf.h"
 #include "song.h"
+#include "decoder_api.h"
+#include "decoder_list.h"
 #include "playlist_list.h"
 #include "playlist_plugin.h"
 
@@ -43,6 +45,95 @@ my_log_func(const gchar *log_domain, G_GNUC_UNUSED GLogLevelFlags log_level,
 		g_printerr("%s\n", message);
 }
 
+void
+decoder_initialized(G_GNUC_UNUSED struct decoder *decoder,
+		    G_GNUC_UNUSED const struct audio_format *audio_format,
+		    G_GNUC_UNUSED bool seekable,
+		    G_GNUC_UNUSED float total_time)
+{
+}
+
+enum decoder_command
+decoder_get_command(G_GNUC_UNUSED struct decoder *decoder)
+{
+	return DECODE_COMMAND_NONE;
+}
+
+void
+decoder_command_finished(G_GNUC_UNUSED struct decoder *decoder)
+{
+}
+
+double
+decoder_seek_where(G_GNUC_UNUSED struct decoder *decoder)
+{
+	return 1.0;
+}
+
+void
+decoder_seek_error(G_GNUC_UNUSED struct decoder *decoder)
+{
+}
+
+size_t
+decoder_read(G_GNUC_UNUSED struct decoder *decoder,
+	     struct input_stream *is,
+	     void *buffer, size_t length)
+{
+	return input_stream_lock_read(is, buffer, length, NULL);
+}
+
+void
+decoder_timestamp(G_GNUC_UNUSED struct decoder *decoder,
+		  G_GNUC_UNUSED double t)
+{
+}
+
+enum decoder_command
+decoder_data(G_GNUC_UNUSED struct decoder *decoder,
+	     G_GNUC_UNUSED struct input_stream *is,
+	     const void *data, size_t datalen,
+	     G_GNUC_UNUSED uint16_t kbit_rate)
+{
+	write(1, data, datalen);
+	return DECODE_COMMAND_NONE;
+}
+
+enum decoder_command
+decoder_tag(G_GNUC_UNUSED struct decoder *decoder,
+	    G_GNUC_UNUSED struct input_stream *is,
+	    G_GNUC_UNUSED const struct tag *tag)
+{
+	return DECODE_COMMAND_NONE;
+}
+
+float
+decoder_replay_gain(G_GNUC_UNUSED struct decoder *decoder,
+		    const struct replay_gain_info *replay_gain_info)
+{
+	const struct replay_gain_tuple *tuple =
+		&replay_gain_info->tuples[REPLAY_GAIN_ALBUM];
+	if (replay_gain_tuple_defined(tuple))
+		g_printerr("replay_gain[album]: gain=%f peak=%f\n",
+			   tuple->gain, tuple->peak);
+
+	tuple = &replay_gain_info->tuples[REPLAY_GAIN_TRACK];
+	if (replay_gain_tuple_defined(tuple))
+		g_printerr("replay_gain[track]: gain=%f peak=%f\n",
+			   tuple->gain, tuple->peak);
+
+	return 0.0;
+}
+
+void
+decoder_mixramp(G_GNUC_UNUSED struct decoder *decoder,
+		G_GNUC_UNUSED float replay_gain_db,
+		char *mixramp_start, char *mixramp_end)
+{
+	g_free(mixramp_start);
+	g_free(mixramp_end);
+}
+
 int main(int argc, char **argv)
 {
 	const char *uri;
@@ -89,6 +180,7 @@ int main(int argc, char **argv)
 	}
 
 	playlist_list_global_init();
+	decoder_plugin_init_all();
 
 	/* open the playlist */
 
@@ -152,6 +244,7 @@ int main(int argc, char **argv)
 	g_cond_free(cond);
 	g_mutex_free(mutex);
 
+	decoder_plugin_deinit_all();
 	playlist_list_global_finish();
 	input_stream_global_finish();
 	io_thread_deinit();