replay_gain_info: allocate the struct statically

Don't allocate each replay_gain_info object on the heap.  Those
objects who held a pointer now store a full replay_gain_info object.
This reduces the number of allocations and heap fragmentation.

src/decoder/_flac_common.c

@@ -116,7 +116,7 @@ void flac_metadata_common_cb(const FLAC__StreamMetadata * block,
 	if (data->unsupported)
 		return;
 
-	struct replay_gain_info *rgi;
+	struct replay_gain_info rgi;
 
 	switch (block->type) {
 	case FLAC__METADATA_TYPE_STREAMINFO:
@@ -124,11 +124,8 @@ void flac_metadata_common_cb(const FLAC__StreamMetadata * block,
 		break;
 
 	case FLAC__METADATA_TYPE_VORBIS_COMMENT:
-		rgi = flac_parse_replay_gain(block);
-		if (rgi != NULL) {
-			decoder_replay_gain(data->decoder, rgi);
-			replay_gain_info_free(rgi);
-		}
+		if (flac_parse_replay_gain(&rgi, block))
+			decoder_replay_gain(data->decoder, &rgi);
 
 		if (data->tag != NULL)
 			flac_vorbis_comments_to_tag(data->tag, NULL,

src/decoder/flac_metadata.c

@@ -56,13 +56,13 @@ flac_find_float_comment(const FLAC__StreamMetadata *block,
 	return true;
 }
 
-struct replay_gain_info *
-flac_parse_replay_gain(const FLAC__StreamMetadata *block)
+bool
+flac_parse_replay_gain(struct replay_gain_info *rgi,
+		       const FLAC__StreamMetadata *block)
 {
-	struct replay_gain_info *rgi;
 	bool found = false;
 
-	rgi = replay_gain_info_new();
+	replay_gain_info_init(rgi);
 
 	if (flac_find_float_comment(block, "replaygain_album_gain",
 				    &rgi->tuples[REPLAY_GAIN_ALBUM].gain))
@@ -77,12 +77,7 @@ flac_parse_replay_gain(const FLAC__StreamMetadata *block)
 				    &rgi->tuples[REPLAY_GAIN_TRACK].peak))
 		found = true;
 
-	if (!found) {
-		replay_gain_info_free(rgi);
-		rgi = NULL;
-	}
-
-	return rgi;
+	return found;
 }
 
 /**

src/decoder/flac_metadata.h

@@ -20,9 +20,11 @@
 #ifndef MPD_FLAC_METADATA_H
 #define MPD_FLAC_METADATA_H
 
+#include <stdbool.h>
 #include <FLAC/metadata.h>
 
 struct tag;
+struct replay_gain_info;
 
 static inline unsigned
 flac_duration(const FLAC__StreamMetadata_StreamInfo *stream_info)
@@ -31,8 +33,9 @@ flac_duration(const FLAC__StreamMetadata_StreamInfo *stream_info)
 		stream_info->sample_rate;
 }
 
-struct replay_gain_info *
-flac_parse_replay_gain(const FLAC__StreamMetadata *block);
+bool
+flac_parse_replay_gain(struct replay_gain_info *rgi,
+		       const FLAC__StreamMetadata *block);
 
 void
 flac_vorbis_comments_to_tag(struct tag *tag, const char *char_tnum,

src/decoder/mad_decoder_plugin.c

@@ -300,17 +300,17 @@ static int parse_rva2(struct id3_tag * tag, struct replay_gain_info * replay_gai
 #endif
 
 #ifdef HAVE_ID3TAG
-static struct replay_gain_info *
-parse_id3_replay_gain_info(struct id3_tag *tag)
+static bool
+parse_id3_replay_gain_info(struct replay_gain_info *replay_gain_info,
+			   struct id3_tag *tag)
 {
 	int i;
 	char *key;
 	char *value;
 	struct id3_frame *frame;
 	bool found = false;
-	struct replay_gain_info *replay_gain_info;
 
-	replay_gain_info = replay_gain_info_new();
+	replay_gain_info_init(replay_gain_info);
 
 	for (i = 0; (frame = id3_tag_findframe(tag, "TXXX", i)); i++) {
 		if (frame->nfields < 3)
@@ -341,15 +341,9 @@ parse_id3_replay_gain_info(struct id3_tag *tag)
 		free(value);
 	}
 
-	if (!found) {
+	return found ||
 		/* fall back on RVA2 if no replaygain tags found */
-		found = parse_rva2(tag, replay_gain_info);
-	}
-
-	if (found)
-		return replay_gain_info;
-	replay_gain_info_free(replay_gain_info);
-	return NULL;
+		parse_rva2(tag, replay_gain_info);
 }
 #endif
 
@@ -408,11 +402,9 @@ static void mp3_parse_id3(struct mp3_data *data, size_t tagsize,
 	}
 
 	if (data->decoder != NULL) {
-		struct replay_gain_info *tmp_rgi =
-			parse_id3_replay_gain_info(id3_tag);
-		if (tmp_rgi != NULL) {
-			decoder_replay_gain(data->decoder, tmp_rgi);
-			replay_gain_info_free(tmp_rgi);
+		struct replay_gain_info rgi;
+		if (parse_id3_replay_gain_info(&rgi, id3_tag)) {
+			decoder_replay_gain(data->decoder, &rgi);
 			data->found_replay_gain = true;
 		}
 	}
@@ -879,15 +871,14 @@ mp3_decode_first_frame(struct mp3_data *data, struct tag **tag)
 			if (data->decoder != NULL &&
 			    !data->found_replay_gain &&
 			    lame.track_gain) {
-				struct replay_gain_info *rgi
-					= replay_gain_info_new();
-				rgi->tuples[REPLAY_GAIN_TRACK].gain = lame.track_gain;
-				rgi->tuples[REPLAY_GAIN_TRACK].peak = lame.peak;
-				decoder_replay_gain(data->decoder, rgi);
-				replay_gain_info_free(rgi);
+				struct replay_gain_info rgi;
+				replay_gain_info_init(&rgi);
+				rgi.tuples[REPLAY_GAIN_TRACK].gain = lame.track_gain;
+				rgi.tuples[REPLAY_GAIN_TRACK].peak = lame.peak;
+				decoder_replay_gain(data->decoder, &rgi);
 			}
 		}
-	} 
+	}
 
 	if (!data->max_frames)
 		return false;

src/decoder/mpcdec_decoder_plugin.c

@@ -154,7 +154,6 @@ mpcdec_decode(struct decoder *mpd_decoder, struct input_stream *is)
 	long bit_rate = 0;
 	mpc_uint32_t vbr_update_acc;
 	mpc_uint32_t vbr_update_bits;
-	struct replay_gain_info *replay_gain_info = NULL;
 	enum decoder_command cmd = DECODE_COMMAND_NONE;
 
 	data.is = is;
@@ -205,13 +204,13 @@ mpcdec_decode(struct decoder *mpd_decoder, struct input_stream *is)
 		return;
 	}
 
-	replay_gain_info = replay_gain_info_new();
-	replay_gain_info->tuples[REPLAY_GAIN_ALBUM].gain = info.gain_album * 0.01;
-	replay_gain_info->tuples[REPLAY_GAIN_ALBUM].peak = info.peak_album / 32767.0;
-	replay_gain_info->tuples[REPLAY_GAIN_TRACK].gain = info.gain_title * 0.01;
-	replay_gain_info->tuples[REPLAY_GAIN_TRACK].peak = info.peak_title / 32767.0;
-	decoder_replay_gain(mpd_decoder, replay_gain_info);
-	replay_gain_info_free(replay_gain_info);
+	struct replay_gain_info replay_gain_info;
+	replay_gain_info_init(&replay_gain_info);
+	replay_gain_info.tuples[REPLAY_GAIN_ALBUM].gain = info.gain_album * 0.01;
+	replay_gain_info.tuples[REPLAY_GAIN_ALBUM].peak = info.peak_album / 32767.0;
+	replay_gain_info.tuples[REPLAY_GAIN_TRACK].gain = info.gain_title * 0.01;
+	replay_gain_info.tuples[REPLAY_GAIN_TRACK].peak = info.peak_title / 32767.0;
+	decoder_replay_gain(mpd_decoder, &replay_gain_info);
 
 	decoder_initialized(mpd_decoder, &audio_format,
 			    is->seekable,

src/decoder/vorbis_decoder_plugin.c

@@ -134,14 +134,13 @@ vorbis_comment_value(const char *comment, const char *needle)
 	return NULL;
 }
 
-static struct replay_gain_info *
-vorbis_comments_to_replay_gain(char **comments)
+static bool
+vorbis_comments_to_replay_gain(struct replay_gain_info *rgi, char **comments)
 {
-	struct replay_gain_info *rgi;
 	const char *temp;
 	bool found = false;
 
-	rgi = replay_gain_info_new();
+	replay_gain_info_init(rgi);
 
 	while (*comments) {
 		if ((temp =
@@ -165,12 +164,7 @@ vorbis_comments_to_replay_gain(char **comments)
 		comments++;
 	}
 
-	if (!found) {
-		replay_gain_info_free(rgi);
-		rgi = NULL;
-	}
-
-	return rgi;
+	return found;
 }
 
 static const char *VORBIS_COMMENT_TRACK_KEY = "tracknumber";
@@ -334,7 +328,6 @@ vorbis_stream_decode(struct decoder *decoder,
 
 		if (current_section != prev_section) {
 			char **comments;
-			struct replay_gain_info *new_rgi;
 
 			vi = ov_info(&vf, -1);
 			if (vi == NULL) {
@@ -352,11 +345,10 @@ vorbis_stream_decode(struct decoder *decoder,
 
 			comments = ov_comment(&vf, -1)->user_comments;
 			vorbis_send_comments(decoder, input_stream, comments);
-			new_rgi = vorbis_comments_to_replay_gain(comments);
-			if (new_rgi != NULL) {
-				decoder_replay_gain(decoder, new_rgi);
-				replay_gain_info_free(new_rgi);
-			}
+
+			struct replay_gain_info rgi;
+			if (vorbis_comments_to_replay_gain(&rgi, comments))
+				decoder_replay_gain(decoder, &rgi);
 
 			prev_section = current_section;
 		}

src/decoder/wavpack_decoder_plugin.c

@@ -256,13 +256,13 @@ wavpack_tag_float(WavpackContext *wpc, const char *key, float *value_r)
 	return true;
 }
 
-static struct replay_gain_info *
-wavpack_replaygain(WavpackContext *wpc)
+static bool
+wavpack_replaygain(struct replay_gain_info *replay_gain_info,
+		   WavpackContext *wpc)
 {
-	struct replay_gain_info *replay_gain_info;
 	bool found = false;
 
-	replay_gain_info = replay_gain_info_new();
+	replay_gain_info_init(replay_gain_info);
 
 	found |= wavpack_tag_float(
 		wpc, "replaygain_track_gain",
@@ -281,13 +281,7 @@ wavpack_replaygain(WavpackContext *wpc)
 		&replay_gain_info->tuples[REPLAY_GAIN_ALBUM].peak
 	);
 
-	if (found) {
-		return replay_gain_info;
-	}
-
-	replay_gain_info_free(replay_gain_info);
-
-	return NULL;
+	return found;
 }
 
 /*
@@ -554,7 +548,6 @@ wavpack_filedecode(struct decoder *decoder, const char *fname)
 {
 	char error[ERRORLEN];
 	WavpackContext *wpc;
-	struct replay_gain_info *replay_gain_info;
 
 	wpc = WavpackOpenFileInput(
 		fname, error,
@@ -568,11 +561,9 @@ wavpack_filedecode(struct decoder *decoder, const char *fname)
 		return;
 	}
 
-	replay_gain_info = wavpack_replaygain(wpc);
-	if (replay_gain_info != NULL) {
-		decoder_replay_gain(decoder, replay_gain_info);
-		replay_gain_info_free(replay_gain_info);
-	}
+	struct replay_gain_info replay_gain_info;
+	if (wavpack_replaygain(&replay_gain_info, wpc))
+		decoder_replay_gain(decoder, &replay_gain_info);
 
 	wavpack_decode(decoder, wpc, true);