fate: add support for multithread testing

Add a THREADS variable to fate calls.

Makefile

@@ -290,7 +290,7 @@ fate: $(FATE)
 
 $(FATE): ffmpeg$(EXESUF) $(FATE_UTILS:%=tests/%$(HOSTEXESUF))
 	@echo "TEST    $(@:fate-%=%)"
-	$(Q)$(SRC_PATH)/tests/fate-run.sh $@ "$(SAMPLES)" "$(TARGET_EXEC)" "$(TARGET_PATH)" '$(CMD)' '$(CMP)' '$(REF)' '$(FUZZ)'
+	$(Q)$(SRC_PATH)/tests/fate-run.sh $@ "$(SAMPLES)" "$(TARGET_EXEC)" "$(TARGET_PATH)" '$(CMD)' '$(CMP)' '$(REF)' '$(FUZZ)' '$(THREADS)'
 
 fate-list:
 	@printf '%s\n' $(sort $(FATE))

tests/fate-run.sh

@@ -15,6 +15,7 @@ command=$5
 cmp=${6:-diff}
 ref=${7:-"${base}/ref/fate/${test}"}
 fuzz=$8
+threads=${9:-1}
 
 outdir="tests/data/fate"
 outfile="${outdir}/${test}"
@@ -48,7 +49,7 @@ run(){
 }
 
 ffmpeg(){
-    run ffmpeg -v 0 "$@"
+    run ffmpeg -v 0 -threads $threads "$@"
 }
 
 framecrc(){
@@ -77,7 +78,7 @@ regtest(){
     cleanfiles="$cleanfiles $outfile $errfile"
     outfile=tests/data/regression/$2/$t
     errfile=tests/data/$t.$2.err
-    ${base}/${1}-regression.sh $t $2 $3 "$target_exec" "$target_path"
+    ${base}/${1}-regression.sh $t $2 $3 "$target_exec" "$target_path" "$threads"
 }
 
 codectest(){

tests/regression-funcs.sh

@@ -9,6 +9,7 @@ test_ref=$2
 raw_src_dir=$3
 target_exec=$4
 target_path=$5
+threads=${6:-1}
 
 datadir="./tests/data"
 target_datadir="${target_path}/${datadir}"
@@ -52,7 +53,7 @@ echov(){
 
 . $(dirname $0)/md5.sh
 
-FFMPEG_OPTS="-v 0 -y -flags +bitexact -dct fastint -idct simple -sws_flags +accurate_rnd+bitexact"
+FFMPEG_OPTS="-v 0 -threads $threads -y -flags +bitexact -dct fastint -idct simple -sws_flags +accurate_rnd+bitexact"
 
 run_ffmpeg()
 {