opensles::Play() : be sure to avoid infinite loop

drop audio packet after 5 seconds
it'll be much too late anyway; and 1 second later is arguably too late too
(cherry picked from commit 6189c75855cf343875c334cd9a9b824b3585c5c0)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/audio_output/opensles_android.c

@@ -284,39 +284,46 @@ static void Close( vlc_object_t *p_this )
 /*****************************************************************************
  * Play: play a sound
  *****************************************************************************/
-static void Play( audio_output_t * p_aout, block_t *p_buffer )
+static void Play( audio_output_t *p_aout, block_t *p_buffer )
 {
-    aout_sys_t * p_sys = p_aout->sys;
-    SLresult result;
+    aout_sys_t *p_sys = p_aout->sys;
+    int tries = 5;
 
     for (;;)
     {
-        result = (*p_sys->playerBufferQueue)->Enqueue(
+        SLresult result = (*p_sys->playerBufferQueue)->Enqueue(
                             p_sys->playerBufferQueue, p_buffer->p_buffer,
                             p_buffer->i_buffer );
-        if( result == SL_RESULT_SUCCESS )
-            break;
-        if ( result != SL_RESULT_BUFFER_INSUFFICIENT )
+
+        switch (result)
         {
-            msg_Warn( p_aout, "Dropping invalid buffer" );
-            aout_BufferFree( p_buffer );
-            return ;
-        }
+        case SL_RESULT_SUCCESS:
+            p_sys->p_buffer_array[p_sys->i_toappend_buffer] = p_buffer;
+            if( ++p_sys->i_toappend_buffer == BUFF_QUEUE )
+                p_sys->i_toappend_buffer = 0;
+            return;
 
-        msg_Err( p_aout, "write error (%lu)", result );
+        case SL_RESULT_BUFFER_INSUFFICIENT:
+            msg_Err( p_aout, "buffer insufficient");
 
-        // Wait a bit to retry. might miss calls to *cancel
-        // but this is supposed to be rare anyway
+            if (tries--)
+            {
+                // Wait a bit to retry.
                 msleep(CLOCK_FREQ);
+                continue;
+            }
+
+        default:
+            msg_Warn( p_aout, "Error %lu, dropping buffer", result );
+            aout_BufferFree( p_buffer );
+            return;
+        }
     }
-    p_sys->p_buffer_array[p_sys->i_toappend_buffer] = p_buffer;
-    if( ++p_sys->i_toappend_buffer == BUFF_QUEUE )
-        p_sys->i_toappend_buffer = 0;
 }
 
 static void PlayedCallback (SLAndroidSimpleBufferQueueItf caller, void *pContext )
 {
-    aout_sys_t *p_sys = (aout_sys_t*)pContext;
+    aout_sys_t *p_sys = pContext;
 
     assert (caller == p_sys->playerBufferQueue);