rawvideo: do not memcpy but use the block data pointer as picture data

Manual backport of commit-id: edcd9df100cf1e8daa502d257c6d9543a0e1c45d

modules/codec/rawvideo.c

@@ -267,6 +267,22 @@ static void FillPicture( decoder_t *p_dec, block_t *p_block, picture_t *p_pic )
 {
     int i_plane;
     decoder_sys_t *p_sys = p_dec->p_sys;
+
+    if( p_pic->i_type == MEMORY_PICTURE )
+    {
+        free( p_pic->p_data_orig );
+        p_pic->p_data_orig = p_block;
+
+        p_pic->p_data = p_block->p_buffer;
+
+        /* Fill the p_pixels field for each plane */
+        p_pic->p[0].p_pixels = p_pic->p_data;
+        for( int i = 1; i < p_pic->i_planes; i++ )
+            p_pic->p[i].p_pixels = p_pic->p[i-1].p_pixels +
+                p_pic->p[i-1].i_lines * p_pic->p[i-1].i_pitch;
+    }
+    else
+    {
         uint8_t *p_src = p_block->p_buffer;
 
         for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
@@ -286,6 +302,8 @@ static void FillPicture( decoder_t *p_dec, block_t *p_block, picture_t *p_pic )
                     p_dst += i_pitch, p_src += i_visible_pitch )
                     vlc_memcpy( p_dst, p_src, i_visible_pitch );
         }
+        block_Release( p_block );
+    }
 }
 
 /*****************************************************************************
@@ -309,7 +327,6 @@ static picture_t *DecodeFrame( decoder_t *p_dec, block_t *p_block )
     p_pic->date = date_Get( &p_sys->pts );
     p_pic->b_progressive = true;
 
-    block_Release( p_block );
     return p_pic;
 }