inputPlugins/wavpack_plugin: adding dummy code for ReplayGain support

This ReplayGain code is currently disabled because WavpackGetTagItem can't
seem to find replaygain_* fields in APEv2 tags (which is how wvgain stores
ReplayGain values).  Additionally, because APEv2 tags are stored at the end
of the file, this code is only implemented for regular files and not HTTP
streams.  Using HTTP seeking it *may* be possible to implement it for both.

git-svn-id: https://svn.musicpd.org/mpd/trunk@6656 09075e82-0dd4-0310-85a5-a0d7c8717e4f

1 files changed, 84 insertions, 4 deletions

diff --git a/src/inputPlugins/wavpack_plugin.c b/src/inputPlugins/wavpack_plugin.c
index be7a6fa5a..7c50466b7 100644
--- a/src/inputPlugins/wavpack_plugin.c
+++ b/src/inputPlugins/wavpack_plugin.c
@@ -120,7 +120,8 @@ static void format_samples_float(int Bps, void *buffer, uint32_t samcnt)
  * Requires an already opened WavpackContext.
  */
 static void wavpack_decode(OutputBuffer *cb, DecoderControl *dc,
-                           WavpackContext *wpc, int canseek)
+                           WavpackContext *wpc, int canseek,
+                           ReplayGainInfo *replayGainInfo)
 {
 	void (*format_samples)(int Bps, void *buffer, uint32_t samcnt);
 	char chunk[CHUNK_SIZE];
@@ -195,7 +196,7 @@ static void wavpack_decode(OutputBuffer *cb, DecoderControl *dc,
 
 			sendDataToOutputBuffer(cb, NULL, dc, 0, chunk,
 			                       samplesgot * outsamplesize,
-			                       time, bitrate, NULL);
+			                       time, bitrate, replayGainInfo);
 		}
 	} while (samplesgot == samplesreq);
 
@@ -206,6 +207,73 @@ static void wavpack_decode(OutputBuffer *cb, DecoderControl *dc,
 }
 
 /*
+ * These functions aren't currently used, which just results in warnings.
+ */
+#if 0
+static char *wavpack_tag(WavpackContext *wpc, char *key)
+{
+	char *value = NULL;
+	int size;
+
+	size = WavpackGetTagItem(wpc, key, NULL, 0);
+	if (size > 0) {
+		size++;
+		value = xmalloc(size);
+		if (!value)
+			return NULL;
+		WavpackGetTagItem(wpc, key, value, size);
+	}
+
+	return value;
+}
+
+static ReplayGainInfo *wavpack_replaygain(WavpackContext *wpc)
+{
+	ReplayGainInfo *replayGainInfo;
+	int found = 0;
+	char *value;
+
+	replayGainInfo = newReplayGainInfo();
+
+	value = wavpack_tag(wpc, "replaygain_track_gain");
+	if (value) {
+		replayGainInfo->trackGain = atof(value);
+		free(value);
+		found = 1;
+	}
+
+	value = wavpack_tag(wpc, "replaygain_album_gain");
+	if (value) {
+		replayGainInfo->albumGain = atof(value);
+		free(value);
+		found = 1;
+	}
+
+	value = wavpack_tag(wpc, "replaygain_track_peak");
+	if (value) {
+		replayGainInfo->trackPeak = atof(value);
+		free(value);
+		found = 1;
+	}
+
+	value = wavpack_tag(wpc, "replaygain_album_peak");
+	if (value) {
+		replayGainInfo->albumPeak = atof(value);
+		free(value);
+		found = 1;
+	}
+
+
+	if (found)
+		return replayGainInfo;
+
+	freeReplayGainInfo(replayGainInfo);
+
+	return NULL;
+}
+#endif
+
+/*
  * Reads metainfo from the specified file.
  */
 static MpdTag *wavpack_tagdup(char *fname)
@@ -367,7 +435,7 @@ static int wavpack_streamdecode(OutputBuffer *cb, DecoderControl *dc,
 		return -1;
 	}
 
-	wavpack_decode(cb, dc, wpc, can_seek(is));
+	wavpack_decode(cb, dc, wpc, can_seek(is), NULL);
 
 	WavpackCloseFile(wpc);
 	closeInputStream(is); /* calling side doesn't do this in mpd 0.13.0 */
@@ -383,6 +451,7 @@ static int wavpack_filedecode(OutputBuffer *cb, DecoderControl *dc, char *fname)
 {
 	char error[ERRORLEN];
 	WavpackContext *wpc;
+	ReplayGainInfo *replayGainInfo;
 
 	wpc = WavpackOpenFileInput(fname, error,
 	                           OPEN_WVC | OPEN_2CH_MAX | OPEN_NORMALIZE,
@@ -392,7 +461,18 @@ static int wavpack_filedecode(OutputBuffer *cb, DecoderControl *dc, char *fname)
 		return -1;
 	}
 
-	wavpack_decode(cb, dc, wpc, 1);
+	/*
+	 * ReplayGain support is currently disabled, because WavpackGetTagItem
+	 * can't seem to find the replaygain_* fields in APEv2 tags.
+	 */
+
+	/* replayGainInfo = wavpack_replaygain(wpc); */
+	replayGainInfo = NULL;
+
+	wavpack_decode(cb, dc, wpc, 1, replayGainInfo);
+
+	if (replayGainInfo)
+		freeReplayGainInfo(replayGainInfo);
 
 	WavpackCloseFile(wpc);