lavfi: add a QSV scaling filter

This merges libav commit ac7bfd69,
which was previously skipped.

(cherry picked from commit ac7bfd69)
Signed-off-by: Mark Thompson <sw@jkqxz.net>

Changelog

@@ -26,6 +26,7 @@ version <next>:
 - native Opus encoder
 - ScreenPressor decoder
 - incomplete ClearVideo decoder
+- Intel QSV video scaling filter
 
 version 3.2:
 - libopenmpt demuxer

configure

@@ -3127,6 +3127,7 @@ rubberband_filter_deps="librubberband"
 sab_filter_deps="gpl swscale"
 scale2ref_filter_deps="swscale"
 scale_filter_deps="swscale"
+scale_qsv_filter_deps="libmfx"
 select_filter_select="pixelutils"
 showcqt_filter_deps="avcodec avformat swscale"
 showcqt_filter_select="fft"

doc/libav-merge.txt

@@ -94,7 +94,6 @@ Stuff that didn't reach the codebase:
   - a853388d2 hevc: change the stride of the MC buffer to be in bytes instead of elements
   - 0cef06df0 checkasm: add HEVC MC tests
   - e7078e842 hevcdsp: add x86 SIMD for MC
-- QSV scaling filter (62c58c5)
 
 Collateral damage that needs work locally:
 ------------------------------------------

libavfilter/Makefile

@@ -261,6 +261,7 @@ OBJS-$(CONFIG_ROTATE_FILTER)                 += vf_rotate.o
 OBJS-$(CONFIG_SAB_FILTER)                    += vf_sab.o
 OBJS-$(CONFIG_SCALE_FILTER)                  += vf_scale.o scale.o
 OBJS-$(CONFIG_SCALE_NPP_FILTER)              += vf_scale_npp.o scale.o
+OBJS-$(CONFIG_SCALE_QSV_FILTER)              += vf_scale_qsv.o
 OBJS-$(CONFIG_SCALE_VAAPI_FILTER)            += vf_scale_vaapi.o scale.o
 OBJS-$(CONFIG_SCALE2REF_FILTER)              += vf_scale.o scale.o
 OBJS-$(CONFIG_SELECT_FILTER)                 += f_select.o

libavfilter/allfilters.c

@@ -271,6 +271,7 @@ static void register_all(void)
     REGISTER_FILTER(SAB,            sab,            vf);
     REGISTER_FILTER(SCALE,          scale,          vf);
     REGISTER_FILTER(SCALE_NPP,      scale_npp,      vf);
+    REGISTER_FILTER(SCALE_QSV,      scale_qsv,      vf);
     REGISTER_FILTER(SCALE_VAAPI,    scale_vaapi,    vf);
     REGISTER_FILTER(SCALE2REF,      scale2ref,      vf);
     REGISTER_FILTER(SELECT,         select,         vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  74
+#define LIBAVFILTER_VERSION_MINOR  75
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \