Easy API is not flexible enough for our needs.

Instead of picking it in preloading stage.

Fixes #7634.

Signed-off-by: NMichael Niedermayer <michael@niedermayer.cc>

It is unsigned at least on arm, fixes the following warnings:
libavfilter/vf_signalstats.c:833:21: warning: taking the absolute value of unsigned type 'unsigned int' has no effect
            dify += abs(yuv - AV_RN16(prev->data[0] + pw + i * 2));

before this change, scale_vaapi hard coding the scaling mode, add a
new option "mode" to setting the scaling mode, it can be use to change
scaling algorithm for performance/quality trade off.

Note: VA_FILTER_SCALING_NL_ANAMORPHIC(nolinear ananorphic scaling
algorithm) doesn't support by i965/iHD driver now, add this just for
completeness.
Reviewed-by: NMark Thompson <sw@jkqxz.net>
Signed-off-by: NJun Zhao <mypopydev@gmail.com>

Fixes #6987.

abuffersink need to setting AV_OPT_FLAG_AUDIO_PARAM flag.
Reviewed-by: NNicolas George <george@nsup.org>
Signed-off-by: NJun Zhao <mypopydev@gmail.com>

Signed-off-by: NRuiling Song <ruiling.song@intel.com>
Signed-off-by: NMark Thompson <sw@jkqxz.net>

commit b0012de4 missed reindent.
Signed-off-by: NJun Zhao <mypopydev@gmail.com>

Reviewed-by: NPaul B Mahol <onemda@gmail.com>
Signed-off-by: NMichael Niedermayer <michael@niedermayer.cc>

Reviewed-by: NHaihao Xiang <haihao.xiang@intel.com>
Signed-off-by: NJames Almer <jamrial@gmail.com>

Signed-off-by: NMarton Balint <cus@passwd.hu>