[FFmpeg-devel] [PATCH] lavc/qsvenc: let the SDK to choose the encoding mode by default

[Max Dmitrichenko]

it would be good to describe the change a bit more clearly,
something like: Allows MediaSDK *runtime *to choose LowPower/non-LowPower
modes, if not explicitly set.

regards
Max

On Mon, Sep 28, 2020 at 9:32 AM Haihao Xiang <haihao.xiang at intel.com> wrote:

> The SDK may support LowPower and non-LowPower modes, some features are
> available only under one of the two modes. It is hard for user to know
> whether a feature is supported under the given mode, so let the SDK to
> choose a mode for encoding by default.
> ---
>  libavcodec/qsvenc.c | 6 ++++--
>  libavcodec/qsvenc.h | 2 +-
>  2 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/libavcodec/qsvenc.c b/libavcodec/qsvenc.c
> index 1ed8f5d973..cff96e59c9 100644
> --- a/libavcodec/qsvenc.c
> +++ b/libavcodec/qsvenc.c
> @@ -510,7 +510,7 @@ static int init_video_param(AVCodecContext *avctx,
> QSVEncContext *q)
>          }
>      }
>
> -    if (q->low_power) {
> +    if (q->low_power == 1) {
>  #if QSV_HAVE_VDENC
>          q->param.mfx.LowPower = MFX_CODINGOPTION_ON;
>  #else
> @@ -519,7 +519,9 @@ static int init_video_param(AVCodecContext *avctx,
> QSVEncContext *q)
>          q->low_power = 0;
>          q->param.mfx.LowPower = MFX_CODINGOPTION_OFF;
>  #endif
> -    } else
> +    } else if (q->low_power == -1)
> +        q->param.mfx.LowPower = MFX_CODINGOPTION_UNKNOWN;
> +    else
>          q->param.mfx.LowPower = MFX_CODINGOPTION_OFF;
>
>      q->param.mfx.CodecProfile       = q->profile;
> diff --git a/libavcodec/qsvenc.h b/libavcodec/qsvenc.h
> index 4f579d1db1..577775cc1a 100644
> --- a/libavcodec/qsvenc.h
> +++ b/libavcodec/qsvenc.h
> @@ -96,7 +96,7 @@
>  { "adaptive_b",     "Adaptive B-frame placement",
>  OFFSET(qsv.adaptive_b),     AV_OPT_TYPE_INT, { .i64 = -1 }, -1,
> 1, VE },                         \
>  { "b_strategy",     "Strategy to choose between I/P/B-frames",
> OFFSET(qsv.b_strategy),    AV_OPT_TYPE_INT, { .i64 = -1 }, -1,          1,
> VE },                         \
>  { "forced_idr",     "Forcing I frames as IDR frames",
>  OFFSET(qsv.forced_idr),     AV_OPT_TYPE_BOOL,{ .i64 = 0  },  0,
> 1, VE },                         \
> -{ "low_power", "enable low power mode(experimental: many limitations by
> mfx version, BRC modes, etc.)", OFFSET(qsv.low_power), AV_OPT_TYPE_BOOL, {
> .i64 = 0}, 0, 1, VE},\
> +{ "low_power", "enable low power mode(experimental: many limitations by
> mfx version, BRC modes, etc.)", OFFSET(qsv.low_power), AV_OPT_TYPE_BOOL, {
> .i64 = -1}, -1, 1, VE},\
>
>  extern const AVCodecHWConfigInternal *ff_qsv_enc_hw_configs[];
>
> --
> 2.25.1
>
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