From 885513f0a0d2712181b8f03e0590fabc3f0b4247 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stephan=20A=C3=9Fmus?= <superstippi@gmx.de>
Date: Tue, 29 Sep 2009 09:04:05 +0000
Subject: [PATCH] Apparantly, FFmpeg has lock management now, and from the
 tracing, it is indeed used. Spotted this on the libav*-user mailing list.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33346 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 .../media/plugins/ffmpeg/FFmpegPlugin.cpp     | 55 ++++++++++++++++++-
 1 file changed, 54 insertions(+), 1 deletion(-)

diff --git a/src/add-ons/media/plugins/ffmpeg/FFmpegPlugin.cpp b/src/add-ons/media/plugins/ffmpeg/FFmpegPlugin.cpp
index 3e4e1bb5ee..3155b0b222 100644
--- a/src/add-ons/media/plugins/ffmpeg/FFmpegPlugin.cpp
+++ b/src/add-ons/media/plugins/ffmpeg/FFmpegPlugin.cpp
@@ -16,6 +16,8 @@
 
 #include <new>
 
+#include <Locker.h>
+
 extern "C" {
 	#include "avformat.h"
 }
@@ -29,8 +31,59 @@ extern "C" {
 #include "MuxerTable.h"
 
 
+//#define TRACE_FFMPEG_PLUGIN
+#ifdef TRACE_FFMPEG_PLUGIN
+#	define TRACE printf
+#else
+#	define TRACE(a...)
+#endif
+
+#define ERROR(a...) fprintf(stderr, a)
+
+
+static int
+manage_locks(void** _lock, enum AVLockOp operation)
+{
+	TRACE("manage_locks(%p, %d)\n", *_lock, operation);
+
+	BLocker** lock = reinterpret_cast<BLocker**>(_lock);
+
+	switch (operation) {
+		case AV_LOCK_CREATE:
+			TRACE("  AV_LOCK_CREATE\n");
+			*lock = new(std::nothrow) BLocker("FFmpeg lock");
+		 	if (*lock == NULL)
+				return 1;
+			break;
+
+		case AV_LOCK_OBTAIN:
+			TRACE("  AV_LOCK_OBTAIN\n");
+			if (!(*lock)->Lock())
+				return 1;
+			break;
+
+		case AV_LOCK_RELEASE:
+			TRACE("  AV_LOCK_RELEASE\n");
+			(*lock)->Unlock();
+			break;
+
+		case AV_LOCK_DESTROY:
+			TRACE("  AV_LOCK_DESTROY\n");
+			delete *lock;
+			break;
+
+		default:
+			return 1;
+	}
+	return 0;
+}
+
+
 FFmpegPlugin::GlobalInitilizer::GlobalInitilizer()
 {
+	if (av_lockmgr_register(manage_locks) != 0)
+		ERROR("Failed to register lock management!\n");
+
 	av_register_all();
 		// This will also call av_codec_init() by registering codecs.
 }
@@ -38,7 +91,7 @@ FFmpegPlugin::GlobalInitilizer::GlobalInitilizer()
 
 FFmpegPlugin::GlobalInitilizer::~GlobalInitilizer()
 {
-	// TODO: uninit anything here?
+	av_lockmgr_register(NULL);
 }