lavfi: add ProcAmp (color balance) VAAPI video filter.

Add ProcAmp(color balance) vaapi video filter, use the option
like -vf "procamp_vaapi=b=10:h=120:c=2.8:s=3.7" to set
brightness/hue/contrast/saturation.
Signed-off-by: Yun Zhou <yunx.z.zhou@intel.com>
Signed-off-by: Jun Zhao <jun.zhao@intel.com>
Signed-off-by: Mark Thompson <sw@jkqxz.net>

Changelog

@@ -38,6 +38,7 @@ version <next>:
 - Removed the ffserver program
 - Removed the ffmenc and ffmdec muxer and demuxer
 - VideoToolbox HEVC encoder and hwaccel
+- VAAPI-accelerated ProcAmp (color balance) filter
 
 
 version 3.4:

configure

@@ -3245,6 +3245,7 @@ perspective_filter_deps="gpl"
 phase_filter_deps="gpl"
 pp7_filter_deps="gpl"
 pp_filter_deps="gpl postproc"
+procamp_vaapi_filter_deps="vaapi VAProcPipelineParameterBuffer"
 program_opencl_filter_deps="opencl"
 pullup_filter_deps="gpl"
 removelogo_filter_deps="avcodec avformat swscale"

libavfilter/Makefile

@@ -275,6 +275,7 @@ OBJS-$(CONFIG_PP_FILTER)                     += vf_pp.o
 OBJS-$(CONFIG_PP7_FILTER)                    += vf_pp7.o
 OBJS-$(CONFIG_PREMULTIPLY_FILTER)            += vf_premultiply.o framesync.o
 OBJS-$(CONFIG_PREWITT_FILTER)                += vf_convolution.o
+OBJS-$(CONFIG_PROCAMP_VAAPI_FILTER)          += vf_procamp_vaapi.o vaapi_vpp.o
 OBJS-$(CONFIG_PROGRAM_OPENCL_FILTER)         += vf_program_opencl.o opencl.o framesync.o
 OBJS-$(CONFIG_PSEUDOCOLOR_FILTER)            += vf_pseudocolor.o
 OBJS-$(CONFIG_PSNR_FILTER)                   += vf_psnr.o framesync.o

libavfilter/allfilters.c

@@ -284,6 +284,7 @@ static void register_all(void)
     REGISTER_FILTER(PP7,            pp7,            vf);
     REGISTER_FILTER(PREMULTIPLY,    premultiply,    vf);
     REGISTER_FILTER(PREWITT,        prewitt,        vf);
+    REGISTER_FILTER(PROCAMP_VAAPI,  procamp_vaapi,  vf);
     REGISTER_FILTER(PROGRAM_OPENCL, program_opencl, vf);
     REGISTER_FILTER(PSEUDOCOLOR,    pseudocolor,    vf);
     REGISTER_FILTER(PSNR,           psnr,           vf);