Log: new logging library API

Prepare to migrate away from GLib.  Currently, we're still using GLib
as a backend.

src/input/ArchiveInputPlugin.cxx

@@ -25,9 +25,13 @@
 #include "ArchiveFile.hxx"
 #include "InputPlugin.hxx"
 #include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
 
 #include <glib.h>
 
+static constexpr Domain archive_domain("archive");
+
 /**
  * select correct archive plugin to handle the input stream
  * may allow stacking of archive plugins. for example for handling
@@ -51,7 +55,8 @@ input_archive_open(const char *pathname,
 	pname = g_strdup(pathname);
 	// archive_lookup will modify pname when true is returned
 	if (!archive_lookup(pname, &archive, &filename, &suffix)) {
-		g_debug("not an archive, lookup %s failed\n", pname);
+		FormatDebug(archive_domain,
+			    "not an archive, lookup %s failed", pname);
 		g_free(pname);
 		return NULL;
 	}
@@ -59,7 +64,8 @@ input_archive_open(const char *pathname,
 	//check which archive plugin to use (by ext)
 	arplug = archive_plugin_from_suffix(suffix);
 	if (!arplug) {
-		g_warning("can't handle archive %s\n",archive);
+		FormatWarning(archive_domain,
+			      "can't handle archive %s", archive);
 		g_free(pname);
 		return NULL;
 	}

src/input/CdioParanoiaInputPlugin.cxx

@@ -28,6 +28,7 @@
 #include "InputPlugin.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
+#include "Log.hxx"
 
 #include <stdio.h>
 #include <stdint.h>
@@ -195,17 +196,20 @@ input_cdio_open(const char *uri,
 	bool reverse_endian;
 	switch (data_bigendianp(i->drv)) {
 	case -1:
-		g_debug("cdda: drive returns unknown audio data");
+		LogDebug(cdio_domain, "drive returns unknown audio data");
 		reverse_endian = false;
 		break;
+
 	case 0:
-		g_debug("cdda: drive returns audio data Little Endian.");
+		LogDebug(cdio_domain, "drive returns audio data Little Endian");
 		reverse_endian = G_BYTE_ORDER == G_BIG_ENDIAN;
 		break;
+
 	case 1:
-		g_debug("cdda: drive returns audio data Big Endian.");
+		LogDebug(cdio_domain, "drive returns audio data Big Endian");
 		reverse_endian = G_BYTE_ORDER == G_LITTLE_ENDIAN;
 		break;
+
 	default:
 		error.Format(cdio_domain, "Drive returns unknown data type %d",
 			     data_bigendianp(i->drv));
@@ -305,7 +309,8 @@ input_cdio_read(struct input_stream *is, void *ptr, size_t length,
 
 			s_err = cdda_errors(cis->drv);
 			if (s_err) {
-				g_warning("paranoia_read: %s", s_err );
+				FormatError(cdio_domain,
+					    "paranoia_read: %s", s_err);
 				free(s_err);
 			}
 			s_mess = cdda_messages(cis->drv);

src/input/CurlInputPlugin.cxx

@@ -31,6 +31,7 @@
 #include "IOThread.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
+#include "Log.hxx"
 
 #include <assert.h>
 
@@ -53,9 +54,6 @@
 #error libcurl is too old
 #endif
 
-#undef G_LOG_DOMAIN
-#define G_LOG_DOMAIN "input_curl"
-
 /**
  * Do not buffer more than this number of bytes.  It should be a
  * reasonable limit that doesn't make low-end machines suffer too
@@ -297,8 +295,9 @@ CurlSockets::UpdateSockets()
 	CURLMcode mcode = curl_multi_fdset(curl.multi, &rfds, &wfds,
 					   &efds, &max_fd);
 	if (mcode != CURLM_OK) {
-		g_warning("curl_multi_fdset() failed: %s\n",
-			  curl_multi_strerror(mcode));
+		FormatError(curlm_domain,
+			    "curl_multi_fdset() failed: %s",
+			    curl_multi_strerror(mcode));
 		return;
 	}
 
@@ -537,8 +536,9 @@ CurlSockets::PrepareSockets()
 
 		return timeout2;
 	} else {
-		g_warning("curl_multi_timeout() failed: %s\n",
-			  curl_multi_strerror(mcode));
+		FormatWarning(curlm_domain,
+			      "curl_multi_timeout() failed: %s",
+			      curl_multi_strerror(mcode));
 		return -1;
 	}
 }
@@ -880,7 +880,7 @@ input_curl_headerfunction(void *ptr, size_t size, size_t nmemb, void *stream)
 		buffer[end - value] = 0;
 
 		icy_metaint = g_ascii_strtoull(buffer, NULL, 10);
-		g_debug("icy-metaint=%zu", icy_metaint);
+		FormatDebug(curl_domain, "icy-metaint=%zu", icy_metaint);
 
 		if (icy_metaint > 0) {
 			c->icy.Start(icy_metaint);

src/input/DespotifyInputPlugin.cxx

@@ -24,6 +24,7 @@
 #include "InputStream.hxx"
 #include "InputPlugin.hxx"
 #include "tag/Tag.hxx"
+#include "Log.hxx"
 
 extern "C" {
 #include <despotify.h>
@@ -85,7 +86,7 @@ refill_buffer(DespotifyInputStream *ctx)
 			break;
 
 		if (rc < 0) {
-			g_debug("despotify_get_pcm error\n");
+			LogDebug(despotify_domain, "despotify_get_pcm error");
 			ctx->eof = true;
 			break;
 		}
@@ -108,14 +109,14 @@ static void callback(gcc_unused struct despotify_session* ds,
 		break;
 
 	case DESPOTIFY_TRACK_PLAY_ERROR:
-		g_debug("Track play error\n");
+		LogWarning(despotify_domain, "Track play error");
 		ctx->eof = true;
 		ctx->len_available = 0;
 		break;
 
 	case DESPOTIFY_END_OF_PLAYLIST:
 		ctx->eof = true;
-		g_debug("End of playlist: %d\n", ctx->eof);
+		FormatDebug(despotify_domain, "End of playlist: %d", ctx->eof);
 		break;
 	}
 }
@@ -139,7 +140,7 @@ input_despotify_open(const char *url,
 
 	ds_link = despotify_link_from_uri(url + 6);
 	if (!ds_link) {
-		g_debug("Can't find %s\n", url);
+		FormatDebug(despotify_domain, "Can't find %s", url);
 		return NULL;
 	}
 	if (ds_link->type != LINK_TYPE_TRACK) {

src/input/FfmpegInputPlugin.cxx

@@ -34,9 +34,6 @@ extern "C" {
 #include <libavformat/avformat.h>
 }
 
-#undef G_LOG_DOMAIN
-#define G_LOG_DOMAIN "input_ffmpeg"
-
 struct FfmpegInputStream {
 	struct input_stream base;
 

src/input/FileInputPlugin.cxx

@@ -33,9 +33,6 @@
 #include <string.h>
 #include <glib.h>
 
-#undef G_LOG_DOMAIN
-#define G_LOG_DOMAIN "input_file"
-
 static constexpr Domain file_domain("file");
 
 struct FileInputStream {

src/input/MmsInputPlugin.cxx

@@ -31,9 +31,6 @@
 #include <string.h>
 #include <errno.h>
 
-#undef G_LOG_DOMAIN
-#define G_LOG_DOMAIN "input_mms"
-
 struct MmsInputStream {
 	struct input_stream base;
 

src/input/RewindInputPlugin.cxx

@@ -28,9 +28,6 @@
 #include <string.h>
 #include <stdio.h>
 
-#undef G_LOG_DOMAIN
-#define G_LOG_DOMAIN "input_rewind"
-
 extern const struct input_plugin rewind_input_plugin;
 
 struct RewindInputStream {