From 85a5bb173e99dcc0417ffd3810fe8a63afde56c7 Mon Sep 17 00:00:00 2001
From: Mehdi Sabwat <mehdi@videolabs.io>
Date: Mon, 9 Nov 2020 22:35:32 +0100
Subject: [PATCH] logger: add emscripten module
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Co-authored-by: Hugo Beauzée-Luyssen <hugo@beauzee.fr>
Co-authored-by: Thomas Guillem <thomas@gllm.fr>
---
 modules/logger/Makefile.am  |  6 +++
 modules/logger/emscripten.c | 86 +++++++++++++++++++++++++++++++++++++
 2 files changed, 92 insertions(+)
 create mode 100644 modules/logger/emscripten.c

diff --git a/modules/logger/Makefile.am b/modules/logger/Makefile.am
index 8ab485c8fe..1d10a6e3a4 100644
--- a/modules/logger/Makefile.am
+++ b/modules/logger/Makefile.am
@@ -25,3 +25,9 @@ endif
 
 libjson_tracer_plugin_la_SOURCES = logger/json.c
 logger_LTLIBRARIES += libjson_tracer_plugin.la
+
+libemscripten_logger_plugin_la_SOURCES = logger/emscripten.c
+
+if HAVE_EMSCRIPTEN
+logger_LTLIBRARIES += libemscripten_logger_plugin.la
+endif
diff --git a/modules/logger/emscripten.c b/modules/logger/emscripten.c
new file mode 100644
index 0000000000..67c39ddfc0
--- /dev/null
+++ b/modules/logger/emscripten.c
@@ -0,0 +1,86 @@
+/*****************************************************************************
+ * emscripten.c: Emscripten logger
+ *****************************************************************************
+ * Copyright © 2022 VLC authors, VideoLAN and Videolabs
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser 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.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <emscripten.h>
+
+#include <stdarg.h>
+#include <stdio.h>
+
+#include <vlc_common.h>
+#include <vlc_plugin.h>
+
+static void EmscriptenPrintMsg(void *opaque, int type, const vlc_log_t *p_item,
+                               const char *format, va_list ap)
+{
+    int prio;
+    char *message;
+    int verbosity = (int)opaque;
+
+    if (verbosity < type)
+        return;
+
+    if (vasprintf(&message, format, ap) < 0)
+        return;
+    switch (type) {
+        case VLC_MSG_ERR:
+            prio = EM_LOG_CONSOLE | EM_LOG_ERROR;
+            break;
+        case VLC_MSG_WARN:
+            prio = EM_LOG_CONSOLE | EM_LOG_WARN;
+            break;
+        case VLC_MSG_INFO:
+            prio = EM_LOG_CONSOLE | EM_LOG_INFO;
+            break;
+        case VLC_MSG_DBG:
+            prio = EM_LOG_CONSOLE | EM_LOG_DEBUG;
+        default:
+            prio = EM_LOG_CONSOLE;
+    }
+
+    emscripten_log(prio, "[vlc.js: 0x%"PRIxPTR"/0x%"PRIxPTR"] %s %s: %s",
+                   p_item->i_object_id, p_item->tid, p_item->psz_module,
+                   p_item->psz_object_type, message);
+    free(message);
+}
+
+static const struct vlc_logger_operations ops = { EmscriptenPrintMsg, NULL };
+
+static const struct vlc_logger_operations *Open(vlc_object_t *obj, void **sysp)
+{
+    int verbosity = var_InheritInteger(obj, "verbose");
+
+    if (verbosity < 0)
+        return NULL;
+    verbosity += VLC_MSG_ERR;
+    *sysp = (void *)(int)verbosity;
+    return &ops;
+}
+
+vlc_module_begin()
+    set_shortname(N_("emlog"))
+    set_description(N_("Emscripten logger"))
+    set_subcategory(SUBCAT_ADVANCED_MISC)
+    set_capability("logger", 30)
+    set_callback(Open)
+vlc_module_end ()