DecoderControl: move code/attributes to new class MixRampInfo

Makefile.am

@@ -155,6 +155,7 @@ src_mpd_SOURCES = \
 	src/GlobalEvents.cxx src/GlobalEvents.hxx \
 	src/Daemon.cxx src/Daemon.hxx \
 	src/AudioCompress/compress.c \
+	src/MixRampInfo.hxx \
 	src/MusicBuffer.cxx src/MusicBuffer.hxx \
 	src/MusicPipe.cxx src/MusicPipe.hxx \
 	src/MusicChunk.cxx src/MusicChunk.hxx \

src/DecoderAPI.cxx

@@ -541,11 +541,9 @@ decoder_replay_gain(Decoder &decoder,
 }
 
 void
-decoder_mixramp(Decoder &decoder,
-		char *mixramp_start, char *mixramp_end)
+decoder_mixramp(Decoder &decoder, MixRampInfo &&mix_ramp)
 {
 	decoder_control &dc = decoder.dc;
 
-	dc.MixRampStart(mixramp_start);
-	dc.MixRampEnd(mixramp_end);
+	dc.SetMixRamp(std::move(mix_ramp));
 }

src/DecoderAPI.hxx

@@ -33,6 +33,7 @@
 #include "ReplayGainInfo.hxx"
 #include "tag/Tag.hxx"
 #include "AudioFormat.hxx"
+#include "MixRampInfo.hxx"
 #include "ConfigData.hxx"
 
 /**
@@ -184,7 +185,6 @@ decoder_replay_gain(Decoder &decoder,
  * @param mixramp_end the mixramp_end tag; may be nullptr to invalidate
  */
 void
-decoder_mixramp(Decoder &decoder,
-		char *mixramp_start, char *mixramp_end);
+decoder_mixramp(Decoder &decoder, MixRampInfo &&mix_ramp);
 
 #endif

src/DecoderControl.cxx

@@ -30,9 +30,7 @@ decoder_control::decoder_control()
 	:state(DecoderState::STOP),
 	 command(DecoderCommand::NONE),
 	 song(nullptr),
-	 replay_gain_db(0), replay_gain_prev_db(0),
-	 mixramp_start(nullptr), mixramp_end(nullptr),
-	 mixramp_prev_end(nullptr) {}
+	 replay_gain_db(0), replay_gain_prev_db(0) {}
 
 decoder_control::~decoder_control()
 {
@@ -40,10 +38,6 @@ decoder_control::~decoder_control()
 
 	if (song != nullptr)
 		song->Free();
-
-	g_free(mixramp_start);
-	g_free(mixramp_end);
-	g_free(mixramp_prev_end);
 }
 
 bool
@@ -130,25 +124,8 @@ decoder_control::Quit()
 }
 
 void
-decoder_control::MixRampStart(char *_mixramp_start)
-{
-	g_free(mixramp_start);
-	mixramp_start = _mixramp_start;
-}
-
-void
-decoder_control::MixRampEnd(char *_mixramp_end)
-{
-	g_free(mixramp_end);
-	mixramp_end = _mixramp_end;
-}
-
-void
 decoder_control::CycleMixRamp()
 {
-	g_free(mixramp_start);
-	mixramp_start = nullptr;
-	g_free(mixramp_prev_end);
-	mixramp_prev_end = mixramp_end;
-	mixramp_end = nullptr;
+	previous_mix_ramp = std::move(mix_ramp);
+	mix_ramp.Clear();
 }

src/DecoderControl.hxx

@@ -22,6 +22,7 @@
 
 #include "DecoderCommand.hxx"
 #include "AudioFormat.hxx"
+#include "MixRampInfo.hxx"
 #include "thread/Mutex.hxx"
 #include "thread/Cond.hxx"
 #include "thread/Thread.hxx"
@@ -139,9 +140,8 @@ struct decoder_control {
 
 	float replay_gain_db;
 	float replay_gain_prev_db;
-	char *mixramp_start;
-	char *mixramp_end;
-	char *mixramp_prev_end;
+
+	MixRampInfo mix_ramp, previous_mix_ramp;
 
 	decoder_control();
 	~decoder_control();
@@ -351,19 +351,20 @@ public:
 	void Quit();
 
 	const char *GetMixRampStart() const {
-		return mixramp_start;
+		return mix_ramp.GetStart();
 	}
 
 	const char *GetMixRampEnd() const {
-		return mixramp_end;
+		return mix_ramp.GetEnd();
 	}
 
 	const char *GetMixRampPreviousEnd() const {
-		return mixramp_prev_end;
+		return previous_mix_ramp.GetEnd();
 	}
 
-	void MixRampStart(char *_mixramp_start);
-	void MixRampEnd(char *_mixramp_end);
+	void SetMixRamp(MixRampInfo &&new_value) {
+		mix_ramp = std::move(new_value);
+	}
 
 	/**
 	 * Move mixramp_end to mixramp_prev_end and clear

src/MixRampInfo.hxx

+/*
+ * Copyright (C) 2003-2013 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_MIX_RAMP_INFO_HXX
+#define MPD_MIX_RAMP_INFO_HXX
+
+#include "check.h"
+#include "Compiler.h"
+
+#include <string>
+
+class MixRampInfo {
+	std::string start, end;
+
+public:
+	MixRampInfo() = default;
+
+	void Clear() {
+		start.clear();
+		end.clear();
+	}
+
+	gcc_pure
+	bool IsDefined() const {
+		return !start.empty() || !end.empty();
+	}
+
+	gcc_pure
+	const char *GetStart() const {
+		return start.empty() ? nullptr : start.c_str();
+	}
+
+	gcc_pure
+	const char *GetEnd() const {
+		return end.empty() ? nullptr : end.c_str();
+	}
+
+	void SetStart(const char *new_value) {
+		if (new_value == nullptr)
+			start.clear();
+		else
+			start = new_value;
+	}
+
+	void SetStart(std::string &&new_value) {
+		start = std::move(new_value);
+	}
+
+	void SetEnd(const char *new_value) {
+		if (new_value == nullptr)
+			end.clear();
+		else
+			end = new_value;
+	}
+
+	void SetEnd(std::string &&new_value) {
+		end = std::move(new_value);
+	}
+};
+
+#endif

src/decoder/FlacCommon.cxx

@@ -25,6 +25,7 @@
 #include "FlacCommon.hxx"
 #include "FlacMetadata.hxx"
 #include "FlacPcm.hxx"
+#include "MixRampInfo.hxx"
 #include "CheckAudioFormat.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
@@ -94,8 +95,6 @@ void flac_metadata_common_cb(const FLAC__StreamMetadata * block,
 		return;
 
 	ReplayGainInfo rgi;
-	char *mixramp_start;
-	char *mixramp_end;
 
 	switch (block->type) {
 	case FLAC__METADATA_TYPE_STREAMINFO:
@@ -106,9 +105,7 @@ void flac_metadata_common_cb(const FLAC__StreamMetadata * block,
 		if (flac_parse_replay_gain(rgi, block))
 			decoder_replay_gain(data->decoder, &rgi);
 
-		if (flac_parse_mixramp(&mixramp_start, &mixramp_end, block))
-			decoder_mixramp(data->decoder,
-					mixramp_start, mixramp_end);
+		decoder_mixramp(data->decoder, flac_parse_mixramp(block));
 
 		flac_vorbis_comments_to_tag(data->tag,
 					    &block->data.vorbis_comment);

src/decoder/FlacMetadata.cxx

@@ -20,6 +20,7 @@
 #include "config.h"
 #include "FlacMetadata.hxx"
 #include "XiphTags.hxx"
+#include "MixRampInfo.hxx"
 #include "tag/Tag.hxx"
 #include "tag/TagHandler.hxx"
 #include "tag/TagTable.hxx"
@@ -83,44 +84,36 @@ flac_parse_replay_gain(ReplayGainInfo &rgi,
 	return found;
 }
 
-static bool
-flac_find_string_comment(const FLAC__StreamMetadata *block,
-			 const char *cmnt, char **str)
+gcc_pure
+static std::string
+flac_find_string_comment(const FLAC__StreamMetadata *block, const char *cmnt)
 {
 	int offset;
 	size_t pos;
 	int len;
 	const unsigned char *p;
 
-	*str = nullptr;
 	offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, 0,
 								     cmnt);
 	if (offset < 0)
-		return false;
+		return std::string();
 
 	pos = strlen(cmnt) + 1; /* 1 is for '=' */
 	len = block->data.vorbis_comment.comments[offset].length - pos;
 	if (len <= 0)
-		return false;
+		return std::string();
 
 	p = &block->data.vorbis_comment.comments[offset].entry[pos];
-	*str = g_strndup((const char *)p, len);
-
-	return true;
+	return std::string((const char *)p, len);
 }
 
-bool
-flac_parse_mixramp(char **mixramp_start, char **mixramp_end,
-		   const FLAC__StreamMetadata *block)
+MixRampInfo
+flac_parse_mixramp(const FLAC__StreamMetadata *block)
 {
-	bool found = false;
-
-	if (flac_find_string_comment(block, "mixramp_start", mixramp_start))
-		found = true;
-	if (flac_find_string_comment(block, "mixramp_end", mixramp_end))
-		found = true;
-
-	return found;
+	MixRampInfo mix_ramp;
+	mix_ramp.SetStart(flac_find_string_comment(block, "mixramp_start"));
+	mix_ramp.SetEnd(flac_find_string_comment(block, "mixramp_end"));
+	return mix_ramp;
 }
 
 /**

src/decoder/FlacMetadata.hxx

@@ -27,6 +27,8 @@
 
 #include <assert.h>
 
+class MixRampInfo;
+
 class FlacMetadataChain {
 	FLAC__Metadata_Chain *chain;
 
@@ -125,9 +127,8 @@ bool
 flac_parse_replay_gain(ReplayGainInfo &rgi,
 		       const FLAC__StreamMetadata *block);
 
-bool
-flac_parse_mixramp(char **mixramp_start, char **mixramp_end,
-		   const FLAC__StreamMetadata *block);
+MixRampInfo
+flac_parse_mixramp(const FLAC__StreamMetadata *block);
 
 void
 flac_vorbis_comments_to_tag(Tag &tag,

src/decoder/MadDecoderPlugin.cxx

@@ -298,18 +298,16 @@ parse_id3_replay_gain_info(ReplayGainInfo &rgi,
 #endif
 
 #ifdef HAVE_ID3TAG
-static bool
-parse_id3_mixramp(char **mixramp_start, char **mixramp_end,
-		  struct id3_tag *tag)
+gcc_pure
+static MixRampInfo
+parse_id3_mixramp(struct id3_tag *tag)
 {
 	int i;
 	char *key;
 	char *value;
 	struct id3_frame *frame;
-	bool found = false;
 
-	*mixramp_start = nullptr;
-	*mixramp_end = nullptr;
+	MixRampInfo result;
 
 	for (i = 0; (frame = id3_tag_findframe(tag, "TXXX", i)); i++) {
 		if (frame->nfields < 3)
@@ -323,18 +321,16 @@ parse_id3_mixramp(char **mixramp_start, char **mixramp_end,
 					     (&frame->fields[2]));
 
 		if (StringEqualsCaseASCII(key, "mixramp_start")) {
-			*mixramp_start = g_strdup(value);
-			found = true;
+			result.SetStart(value);
 		} else if (StringEqualsCaseASCII(key, "mixramp_end")) {
-			*mixramp_end = g_strdup(value);
-			found = true;
+			result.SetEnd(value);
 		}
 
 		free(key);
 		free(value);
 	}
 
-	return found;
+	return result;
 }
 #endif
 
@@ -393,16 +389,13 @@ MadDecoder::ParseId3(size_t tagsize, Tag **mpd_tag)
 
 	if (decoder != nullptr) {
 		ReplayGainInfo rgi;
-		char *mixramp_start;
-		char *mixramp_end;
 
 		if (parse_id3_replay_gain_info(rgi, id3_tag)) {
 			decoder_replay_gain(*decoder, &rgi);
 			found_replay_gain = true;
 		}
 
-		if (parse_id3_mixramp(&mixramp_start, &mixramp_end, id3_tag))
-			decoder_mixramp(*decoder, mixramp_start, mixramp_end);
+		decoder_mixramp(*decoder, parse_id3_mixramp(id3_tag));
 	}
 
 	id3_tag_delete(id3_tag);

test/dump_playlist.cxx

@@ -131,11 +131,8 @@ decoder_replay_gain(gcc_unused Decoder &decoder,
 }
 
 void
-decoder_mixramp(gcc_unused Decoder &decoder,
-		char *mixramp_start, char *mixramp_end)
+decoder_mixramp(gcc_unused Decoder &decoder, gcc_unused MixRampInfo &&mix_ramp)
 {
-	g_free(mixramp_start);
-	g_free(mixramp_end);
 }
 
 int main(int argc, char **argv)

test/read_tags.cxx

@@ -110,11 +110,8 @@ decoder_replay_gain(gcc_unused Decoder &decoder,
 }
 
 void
-decoder_mixramp(gcc_unused Decoder &decoder,
-		char *mixramp_start, char *mixramp_end)
+decoder_mixramp(gcc_unused Decoder &decoder, gcc_unused MixRampInfo &&mix_ramp)
 {
-	g_free(mixramp_start);
-	g_free(mixramp_end);
 }
 
 static bool empty = true;

test/run_decoder.cxx

@@ -141,11 +141,8 @@ decoder_replay_gain(gcc_unused Decoder &decoder,
 }
 
 void
-decoder_mixramp(gcc_unused Decoder &decoder,
-		char *mixramp_start, char *mixramp_end)
+decoder_mixramp(gcc_unused Decoder &decoder, gcc_unused MixRampInfo &&mix_ramp)
 {
-	g_free(mixramp_start);
-	g_free(mixramp_end);
 }
 
 int main(int argc, char **argv)