Merge remote-tracking branch 'qatar/master'

* qatar/master:
  swscale: Readd #define _SVID_SOURCE
  Fix av_get_channel_layout_string() for positions >31
  configure: Store vda lib flags in extralibs instead of ldflags
  Make channel layout masks unsigned
  dca: ARMv6 optimised decode_blockcode()
  nullenc: drop AVFMT_RAWPICTURE from the flags
  frame-mt: return consumed packet size in ff_thread_decode_frame
  aacdec: add more fate tests covering SBR and PS
  MK(BE)TAG: avoid undefined shifts

Conflicts:
	configure
	libavcodec/arm/dca.h
	libavcodec/dca.c
	libavcodec/mlp_parser.c
	libavcodec/version.h
	libavfilter/asrc_anullsrc.c
	libavfilter/avfilter.c
	libavfilter/avfilter.h
	libavfilter/defaults.c
	libavutil/audioconvert.c
	libavutil/avutil.h
	libswscale/utils.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/pthread.c

@@ -525,7 +525,7 @@ int ff_thread_decode_frame(AVCodecContext *avctx,
         if (fctx->next_decoding >= (avctx->thread_count-1)) fctx->delaying = 0;
 
         *got_picture_ptr=0;
-        return 0;
+        return avpkt->size;
     }
 
     /*
@@ -566,7 +566,8 @@ int ff_thread_decode_frame(AVCodecContext *avctx,
 
     fctx->next_finished = finished;
 
-    return p->result;
+    /* return the size of the consumed packet if no error occurred */
+    return (p->result >= 0) ? avpkt->size : p->result;
 }
 
 void ff_thread_report_progress(AVFrame *f, int n, int field)