DecoderControl: move code/attributes to new class MixRampInfo

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);