[vlc-devel] [PATCH 1/4] decoder: reset the deleted vout on lock and release it outside of variable lock

[Steve Lhomme]

- on_vout_deleted() was and is not called under lock
- vout_UnregisterSubpictureChannel() is not called under lock anymore (in some
cases it's called without the variable lock)
- vout_Release() is not called under lock anymore (in many cases it's called
without the variable lock)
---
 src/input/decoder.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/src/input/decoder.c b/src/input/decoder.c
index 5bd59fc6b0..d66d0311ff 100644
--- a/src/input/decoder.c
+++ b/src/input/decoder.c
@@ -610,19 +610,23 @@ static subpicture_t *spu_new_buffer( decoder_t *p_dec,
     if( !p_vout )
     {
         msg_Warn( p_dec, "no vout found, dropping subpicture" );
-        if( p_owner->p_vout )
+        vlc_mutex_lock( &p_owner->lock );
+        vout_thread_t *p_old_vout = p_owner->p_vout;
+        ssize_t i_deleted_spu_channel = p_owner->i_spu_channel;
+
+        p_owner->p_vout = NULL;
+        p_owner->i_spu_channel = VOUT_SPU_CHANNEL_INVALID;
+        vlc_mutex_unlock( &p_owner->lock );
+
+        if( p_old_vout )
         {
-            assert(p_owner->i_spu_channel != VOUT_SPU_CHANNEL_INVALID);
-            decoder_Notify(p_owner, on_vout_deleted, p_owner->p_vout);
+            assert(i_deleted_spu_channel != VOUT_SPU_CHANNEL_INVALID);
+            decoder_Notify(p_owner, on_vout_deleted, p_old_vout);
 
-            vlc_mutex_lock( &p_owner->lock );
-            vout_UnregisterSubpictureChannel(p_owner->p_vout,
-                                             p_owner->i_spu_channel);
-            p_owner->i_spu_channel = VOUT_SPU_CHANNEL_INVALID;
+            vout_UnregisterSubpictureChannel(p_old_vout,
+                                             i_deleted_spu_channel);
 
-            vout_Release(p_owner->p_vout);
-            p_owner->p_vout = NULL;
-            vlc_mutex_unlock( &p_owner->lock );
+            vout_Release(p_old_vout);
         }
         return NULL;
     }
-- 
2.17.1