audio_format: added function audio_format_to_string()

Unified function for converting an audio_format object to a string,
for log messages and for the "status" command.

5 files changed, 80 insertions, 22 deletions

diff --git a/src/audio_format.c b/src/audio_format.c
new file mode 100644
index 00000000..f88735c7
--- /dev/null
+++ b/src/audio_format.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2003-2009 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 "audio_format.h"
+
+#include <assert.h>
+#include <stdio.h>
+
+#if G_BYTE_ORDER == G_BIG_ENDIAN
+#define REVERSE_ENDIAN_SUFFIX "_le"
+#else
+#define REVERSE_ENDIAN_SUFFIX "_be"
+#endif
+
+const char *
+audio_format_to_string(const struct audio_format *af,
+		       struct audio_format_string *s)
+{
+	assert(af != NULL);
+	assert(s != NULL);
+
+	snprintf(s->buffer, sizeof(s->buffer), "%u:%u%s:%u",
+		 af->sample_rate, af->bits,
+		 af->reverse_endian ? REVERSE_ENDIAN_SUFFIX : "",
+		 af->channels);
+
+	return s->buffer;
+}
diff --git a/src/audio_format.h b/src/audio_format.h
index a4f5ba2e..0c1e425a 100644
--- a/src/audio_format.h
+++ b/src/audio_format.h
@@ -56,6 +56,13 @@ struct audio_format {
 };
 
 /**
+ * Buffer for audio_format_string().
+ */
+struct audio_format_string {
+	char buffer[24];
+};
+
+/**
  * Clears the #audio_format object, i.e. sets all attributes to an
  * undefined (invalid) value.
  */
@@ -219,4 +226,16 @@ static inline double audio_format_time_to_size(const struct audio_format *af)
 	return af->sample_rate * audio_format_frame_size(af);
 }
 
+/**
+ * Renders the #audio_format object into a string, e.g. for printing
+ * it in a log file.
+ *
+ * @param af the #audio_format object
+ * @param s a buffer to print into
+ * @return the string, or NULL if the #audio_format object is invalid
+ */
+const char *
+audio_format_to_string(const struct audio_format *af,
+		       struct audio_format_string *s);
+
 #endif
diff --git a/src/command.c b/src/command.c
index 3466da4d..db0bafa3 100644
--- a/src/command.c
+++ b/src/command.c
@@ -515,18 +515,19 @@ handle_status(struct client *client,
 	}
 
 	if (player_status.state != PLAYER_STATE_STOP) {
+		struct audio_format_string af_string;
+
 		client_printf(client,
 			      COMMAND_STATUS_TIME ": %i:%i\n"
 			      "elapsed: %1.3f\n"
 			      COMMAND_STATUS_BITRATE ": %u\n"
-			      COMMAND_STATUS_AUDIO ": %u:%u:%u\n",
+			      COMMAND_STATUS_AUDIO ": %s\n",
 			      (int)(player_status.elapsed_time + 0.5),
 			      (int)(player_status.total_time + 0.5),
 			      player_status.elapsed_time,
 			      player_status.bit_rate,
-			      player_status.audio_format.sample_rate,
-			      player_status.audio_format.bits,
-			      player_status.audio_format.channels);
+			      audio_format_to_string(&player_status.audio_format,
+						     &af_string));
 	}
 
 	if ((updateJobId = isUpdatingDB())) {
diff --git a/src/decoder_api.c b/src/decoder_api.c
index c6c23182..eb316bc4 100644
--- a/src/decoder_api.c
+++ b/src/decoder_api.c
@@ -44,6 +44,7 @@ decoder_initialized(struct decoder *decoder,
 		    bool seekable, float total_time)
 {
 	struct decoder_control *dc = decoder->dc;
+	struct audio_format_string af_string;
 
 	assert(dc->state == DECODE_STATE_START);
 	assert(dc->pipe != NULL);
@@ -67,18 +68,15 @@ decoder_initialized(struct decoder *decoder,
 
 	player_lock_signal();
 
-	g_debug("audio_format=%u:%u:%u, seekable=%s",
-		dc->in_audio_format.sample_rate,
-		dc->in_audio_format.bits,
-		dc->in_audio_format.channels,
+	g_debug("audio_format=%s, seekable=%s",
+		audio_format_to_string(&dc->in_audio_format, &af_string),
 		seekable ? "true" : "false");
 
 	if (!audio_format_equals(&dc->in_audio_format,
 				 &dc->out_audio_format))
-		g_debug("converting to %u:%u:%u",
-			dc->out_audio_format.sample_rate,
-			dc->out_audio_format.bits,
-			dc->out_audio_format.channels);
+		g_debug("converting to %s",
+			audio_format_to_string(&dc->out_audio_format,
+					       &af_string));
 }
 
 char *decoder_get_uri(G_GNUC_UNUSED struct decoder *decoder)
diff --git a/src/output_thread.c b/src/output_thread.c
index 0b61ab17..fccbad5e 100644
--- a/src/output_thread.c
+++ b/src/output_thread.c
@@ -93,6 +93,7 @@ ao_open(struct audio_output *ao)
 	bool success;
 	GError *error = NULL;
 	const struct audio_format *filter_audio_format;
+	struct audio_format_string af_string;
 
 	assert(!ao->open);
 	assert(ao->fail_timer == NULL);
@@ -145,20 +146,15 @@ ao_open(struct audio_output *ao)
 	ao->open = true;
 
 	g_debug("opened plugin=%s name=\"%s\" "
-		"audio_format=%u:%u:%u:%u",
+		"audio_format=%s",
 		ao->plugin->name, ao->name,
-		ao->out_audio_format.sample_rate,
-		ao->out_audio_format.bits,
-		ao->out_audio_format.channels,
-		ao->out_audio_format.reverse_endian);
+		audio_format_to_string(&ao->out_audio_format, &af_string));
 
 	if (!audio_format_equals(&ao->in_audio_format,
 				 &ao->out_audio_format))
-		g_debug("converting from %u:%u:%u:%u",
-			ao->in_audio_format.sample_rate,
-			ao->in_audio_format.bits,
-			ao->in_audio_format.channels,
-			ao->in_audio_format.reverse_endian);
+		g_debug("converting from %s",
+			audio_format_to_string(&ao->in_audio_format,
+					       &af_string));
 }
 
 static void