decoder/mad: move RVA2 code to tag_rva2.c

4 files changed, 153 insertions, 89 deletions

diff --git a/Makefile.am b/Makefile.am
index 9f4161a40..393207a4a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -198,6 +198,7 @@ mpd_headers = \
 	src/tag_table.h \
 	src/tag_ape.h \
 	src/tag_id3.h \
+	src/tag_rva2.h \
 	src/tag_print.h \
 	src/tag_save.h \
 	src/tokenizer.h \
@@ -405,6 +406,7 @@ TAG_SRC = \
 
 if HAVE_ID3TAG
 TAG_SRC += src/tag_id3.c \
+	src/tag_rva2.c \
 	src/riff.c src/aiff.c
 endif
 
diff --git a/src/decoder/mad_decoder_plugin.c b/src/decoder/mad_decoder_plugin.c
index 037fdfb15..5aa09b336 100644
--- a/src/decoder/mad_decoder_plugin.c
+++ b/src/decoder/mad_decoder_plugin.c
@@ -21,6 +21,7 @@
 #include "decoder_api.h"
 #include "conf.h"
 #include "tag_id3.h"
+#include "tag_rva2.h"
 #include "audio_check.h"
 
 #include <assert.h>
@@ -211,94 +212,6 @@ mp3_fill_buffer(struct mp3_data *data)
 }
 
 #ifdef HAVE_ID3TAG
-/* Parse mp3 RVA2 frame. Shamelessly stolen from madplay. */
-static bool
-parse_rva2(struct id3_tag *tag, struct replay_gain_info *replay_gain_info)
-{
-	struct id3_frame const * frame;
-
-	id3_latin1_t const *id;
-	id3_byte_t const *data;
-	id3_length_t length;
-
-	enum {
-		CHANNEL_OTHER         = 0x00,
-		CHANNEL_MASTER_VOLUME = 0x01,
-		CHANNEL_FRONT_RIGHT   = 0x02,
-		CHANNEL_FRONT_LEFT    = 0x03,
-		CHANNEL_BACK_RIGHT    = 0x04,
-		CHANNEL_BACK_LEFT     = 0x05,
-		CHANNEL_FRONT_CENTRE  = 0x06,
-		CHANNEL_BACK_CENTRE   = 0x07,
-		CHANNEL_SUBWOOFER     = 0x08
-	};
-
-	/* relative volume adjustment information */
-
-	frame = id3_tag_findframe(tag, "RVA2", 0);
-	if (frame == NULL)
-		return false;
-
-	id   = id3_field_getlatin1(id3_frame_field(frame, 0));
-	data = id3_field_getbinarydata(id3_frame_field(frame, 1),
-					&length);
-
-	if (id == NULL || data == NULL)
-		return false;
-
-	/*
-	 * "The 'identification' string is used to identify the
-	 * situation and/or device where this adjustment should apply.
-	 * The following is then repeated for every channel
-	 *
-	 *   Type of channel         $xx
-	 *   Volume adjustment       $xx xx
-	 *   Bits representing peak  $xx
-	 *   Peak volume             $xx (xx ...)"
-	 */
-
-	while (length >= 4) {
-		unsigned int peak_bytes;
-
-		peak_bytes = (data[3] + 7) / 8;
-		if (4 + peak_bytes > length)
-			break;
-
-		if (data[0] == CHANNEL_MASTER_VOLUME) {
-			signed int voladj_fixed;
-			double voladj_float;
-
-			/*
-			 * "The volume adjustment is encoded as a fixed
-			 * point decibel value, 16 bit signed integer
-			 * representing (adjustment*512), giving +/- 64
-			 * dB with a precision of 0.001953125 dB."
-			 */
-
-			voladj_fixed  = (data[1] << 8) | (data[2] << 0);
-			voladj_fixed |= -(voladj_fixed & 0x8000);
-
-			voladj_float  = (double) voladj_fixed / 512;
-
-			replay_gain_info->tuples[REPLAY_GAIN_TRACK].gain = voladj_float;
-			replay_gain_info->tuples[REPLAY_GAIN_ALBUM].gain = voladj_float;
-
-			g_debug("parseRVA2: Relative Volume "
-				"%+.1f dB adjustment (%s)\n",
-				voladj_float, id);
-
-			return true;
-		}
-
-		data   += 4 + peak_bytes;
-		length -= 4 + peak_bytes;
-	}
-
-	return false;
-}
-#endif
-
-#ifdef HAVE_ID3TAG
 static bool
 parse_id3_replay_gain_info(struct replay_gain_info *replay_gain_info,
 			   struct id3_tag *tag)
@@ -342,7 +255,7 @@ parse_id3_replay_gain_info(struct replay_gain_info *replay_gain_info,
 
 	return found ||
 		/* fall back on RVA2 if no replaygain tags found */
-		parse_rva2(tag, replay_gain_info);
+		tag_rva2_parse(tag, replay_gain_info);
 }
 #endif
 
diff --git a/src/tag_rva2.c b/src/tag_rva2.c
new file mode 100644
index 000000000..28002025b
--- /dev/null
+++ b/src/tag_rva2.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2003-2010 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_rva2.h"
+#include "replay_gain_info.h"
+
+#include <glib.h>
+#include <id3tag.h>
+
+bool
+tag_rva2_parse(struct id3_tag *tag, struct replay_gain_info *replay_gain_info)
+{
+	struct id3_frame const * frame;
+
+	id3_latin1_t const *id;
+	id3_byte_t const *data;
+	id3_length_t length;
+
+	enum {
+		CHANNEL_OTHER         = 0x00,
+		CHANNEL_MASTER_VOLUME = 0x01,
+		CHANNEL_FRONT_RIGHT   = 0x02,
+		CHANNEL_FRONT_LEFT    = 0x03,
+		CHANNEL_BACK_RIGHT    = 0x04,
+		CHANNEL_BACK_LEFT     = 0x05,
+		CHANNEL_FRONT_CENTRE  = 0x06,
+		CHANNEL_BACK_CENTRE   = 0x07,
+		CHANNEL_SUBWOOFER     = 0x08
+	};
+
+	/* relative volume adjustment information */
+
+	frame = id3_tag_findframe(tag, "RVA2", 0);
+	if (frame == NULL)
+		return false;
+
+	id   = id3_field_getlatin1(id3_frame_field(frame, 0));
+	data = id3_field_getbinarydata(id3_frame_field(frame, 1),
+					&length);
+
+	if (id == NULL || data == NULL)
+		return false;
+
+	/*
+	 * "The 'identification' string is used to identify the
+	 * situation and/or device where this adjustment should apply.
+	 * The following is then repeated for every channel
+	 *
+	 *   Type of channel         $xx
+	 *   Volume adjustment       $xx xx
+	 *   Bits representing peak  $xx
+	 *   Peak volume             $xx (xx ...)"
+	 */
+
+	while (length >= 4) {
+		unsigned int peak_bytes;
+
+		peak_bytes = (data[3] + 7) / 8;
+		if (4 + peak_bytes > length)
+			break;
+
+		if (data[0] == CHANNEL_MASTER_VOLUME) {
+			signed int voladj_fixed;
+			double voladj_float;
+
+			/*
+			 * "The volume adjustment is encoded as a fixed
+			 * point decibel value, 16 bit signed integer
+			 * representing (adjustment*512), giving +/- 64
+			 * dB with a precision of 0.001953125 dB."
+			 */
+
+			voladj_fixed  = (data[1] << 8) | (data[2] << 0);
+			voladj_fixed |= -(voladj_fixed & 0x8000);
+
+			voladj_float  = (double) voladj_fixed / 512;
+
+			replay_gain_info->tuples[REPLAY_GAIN_TRACK].gain = voladj_float;
+			replay_gain_info->tuples[REPLAY_GAIN_ALBUM].gain = voladj_float;
+
+			g_debug("parseRVA2: Relative Volume "
+				"%+.1f dB adjustment (%s)\n",
+				voladj_float, id);
+
+			return true;
+		}
+
+		data   += 4 + peak_bytes;
+		length -= 4 + peak_bytes;
+	}
+
+	return false;
+}
diff --git a/src/tag_rva2.h b/src/tag_rva2.h
new file mode 100644
index 000000000..a92c97912
--- /dev/null
+++ b/src/tag_rva2.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2003-2010 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_RVA2_H
+#define MPD_TAG_RVA2_H
+
+#include "check.h"
+
+#include <stdbool.h>
+
+struct id3_tag;
+struct replay_gain_info;
+
+/**
+ * Parse the RVA2 tag, and fill the #replay_gain_info struct.  This is
+ * used by decoder plugins with ID3 support.
+ *
+ * @return true on success
+ */
+bool
+tag_rva2_parse(struct id3_tag *tag, struct replay_gain_info *replay_gain_info);
+
+#endif