Re: [FFmpeg-devel] [PATCH] libavcodec/qsvenc: Add min/max QP control options for I/P/B frame

["Chen, Wenbin" <wenbin.chen-at-intel.com@ffmpeg.org>]

> On Fri, 2022-05-06 at 10:19 +0800, Wenbin Chen wrote:
> > From: Yue Heng <yue.heng@intel.com>
> >
> > To do more accurate QP control, add min/max QP control on I/P/B frame
> > separately to qsv encoder. qmax and qmin still work but newly-added
> > options have higher priority.
> >
> > Signed-off-by: Yue Heng <yue.heng@intel.com>
> > Signed-off-by: Wenbin Chen <wenbin.chen@intel.com>
> > ---
> >  doc/encoders.texi   | 18 ++++++++++++++++++
> >  libavcodec/qsvenc.c | 21 +++++++++++++++++++--
> >  libavcodec/qsvenc.h | 12 ++++++++++++
> >  3 files changed, 49 insertions(+), 2 deletions(-)
> >
> > diff --git a/doc/encoders.texi b/doc/encoders.texi
> > index 966032a720..86bcdbc04b 100644
> > --- a/doc/encoders.texi
> > +++ b/doc/encoders.texi
> > @@ -3282,6 +3282,24 @@ Forcing I frames as IDR frames.
> >
> >  @item @var{low_power}
> >  For encoders set this flag to ON to reduce power consumption and GPU
> usage.
> > +
> > +@item @var{max_qp_i}
> > +Maximum video quantizer scale for I frame.
> > +
> > +@item @var{min_qp_i}
> > +Minimum video quantizer scale for I frame.
> > +
> > +@item @var{max_qp_p}
> > +Maximum video quantizer scale for P frame.
> > +
> > +@item @var{min_qp_p}
> > +Minimum video quantizer scale for P frame.
> > +
> > +@item @var{max_qp_b}
> > +Maximum video quantizer scale for B frame.
> > +
> > +@item @var{min_qp_b}
> > +Minimum video quantizer scale for B frame.
> >  @end table
> >
> 
> Are these common options for all codecs ? If not, could you please update
> your
> patch ?
> 
> Thanks
> Haihao

Ok, I will update this patch and submit again.

Thanks
Wenbin
> 
> >  @subsection H264 options
> > diff --git a/libavcodec/qsvenc.c b/libavcodec/qsvenc.c
> > index fbb22ca436..a3e9bb4583 100644
> > --- a/libavcodec/qsvenc.c
> > +++ b/libavcodec/qsvenc.c
> > @@ -930,8 +930,13 @@ static int init_video_param(AVCodecContext
> *avctx,
> > QSVEncContext *q)
> >                  q->extco2.BRefType = q->b_strategy ? MFX_B_REF_PYRAMID :
> > MFX_B_REF_OFF;
> >  #endif
> >  #if QSV_VERSION_ATLEAST(1, 9)
> > -            if (avctx->qmin >= 0 && avctx->qmax >= 0 && avctx->qmin > avctx-
> > >qmax) {
> > -                av_log(avctx, AV_LOG_ERROR, "qmin and or qmax are set but
> > invalid, please make sure min <= max\n");
> > +            if ((avctx->qmin >= 0 && avctx->qmax >= 0 && avctx->qmin > avctx-
> > >qmax) ||
> > +                (q->max_qp_i >= 0 && q->min_qp_i >= 0 && q->min_qp_i > q-
> > >max_qp_i) ||
> > +                (q->max_qp_p >= 0 && q->min_qp_p >= 0 && q->min_qp_p > q-
> > >max_qp_p) ||
> > +                (q->max_qp_b >= 0 && q->min_qp_b >= 0 && q->min_qp_b > q-
> > >max_qp_b)) {
> > +                av_log(avctx, AV_LOG_ERROR,
> > +                       "qmin and or qmax are set but invalid,"
> > +                       " please make sure min <= max\n");
> >                  return AVERROR(EINVAL);
> >              }
> >              if (avctx->qmin >= 0) {
> > @@ -942,6 +947,18 @@ static int init_video_param(AVCodecContext
> *avctx,
> > QSVEncContext *q)
> >                  q->extco2.MaxQPI = avctx->qmax > 51 ? 51 : avctx->qmax;
> >                  q->extco2.MaxQPP = q->extco2.MaxQPB = q->extco2.MaxQPI;
> >              }
> > +            if (q->min_qp_i >= 0)
> > +                q->extco2.MinQPI = q->min_qp_i > 51 ? 51 : q->min_qp_i;
> > +            if (q->max_qp_i >= 0)
> > +                q->extco2.MaxQPI = q->max_qp_i > 51 ? 51 : q->max_qp_i;
> > +            if (q->min_qp_p >= 0)
> > +                q->extco2.MinQPP = q->min_qp_p > 51 ? 51 : q->min_qp_p;
> > +            if (q->max_qp_p >= 0)
> > +                q->extco2.MaxQPP = q->max_qp_p > 51 ? 51 : q->max_qp_p;
> > +            if (q->min_qp_b >= 0)
> > +                q->extco2.MinQPB = q->min_qp_b > 51 ? 51 : q->min_qp_b;
> > +            if (q->max_qp_b >= 0)
> > +                q->extco2.MaxQPB = q->max_qp_b > 51 ? 51 : q->max_qp_b;
> >  #endif
> >              if (q->mbbrc >= 0)
> >                  q->extco2.MBBRC = q->mbbrc ? MFX_CODINGOPTION_ON :
> > MFX_CODINGOPTION_OFF;
> > diff --git a/libavcodec/qsvenc.h b/libavcodec/qsvenc.h
> > index cb84723dfa..ea05967db5 100644
> > --- a/libavcodec/qsvenc.h
> > +++ b/libavcodec/qsvenc.h
> > @@ -105,6 +105,12 @@
> >  { "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},\
> >  { "dblk_idc", "This option disable deblocking. It has value in range
> > 0~2.",   OFFSET(qsv.dblk_idc),   AV_OPT_TYPE_INT,    { .i64 = 0
> > },   0,  2,  VE},    \
> >  { "low_delay_brc",   "Allow to strictly obey avg frame size",
> > OFFSET(qsv.low_delay_brc),  AV_OPT_TYPE_BOOL,{ .i64 = -1 }, -1,          1,
> VE
> > },                         \
> > +{ "max_qp_i", "Maximum video quantizer scale for I
> > frame",       OFFSET(qsv.max_qp_i),       AV_OPT_TYPE_INT, { .i64 = -1 },  -
> > 1,          51, VE},                         \
> > +{ "min_qp_i", "Minimum video quantizer scale for I
> > frame",       OFFSET(qsv.min_qp_i),       AV_OPT_TYPE_INT, { .i64 = -1 },  -
> > 1,          51, VE},                         \
> > +{ "max_qp_p", "Maximum video quantizer scale for P
> > frame",       OFFSET(qsv.max_qp_p),       AV_OPT_TYPE_INT, { .i64 = -1 },  -
> > 1,          51, VE},                         \
> > +{ "min_qp_p", "Minimum video quantizer scale for P
> > frame",       OFFSET(qsv.min_qp_p),       AV_OPT_TYPE_INT, { .i64 = -1 },  -
> > 1,          51, VE},                         \
> > +{ "max_qp_b", "Maximum video quantizer scale for B
> > frame",       OFFSET(qsv.max_qp_b),       AV_OPT_TYPE_INT, { .i64 = -1 },  -
> > 1,          51, VE},                         \
> > +{ "min_qp_b", "Minimum video quantizer scale for B
> > frame",       OFFSET(qsv.min_qp_b),       AV_OPT_TYPE_INT, { .i64 = -1 },  -
> > 1,          51, VE},                         \
> >
> >  extern const AVCodecHWConfigInternal *const ff_qsv_enc_hw_configs[];
> >
> > @@ -218,6 +224,12 @@ typedef struct QSVEncContext {
> >      SetEncodeCtrlCB *set_encode_ctrl_cb;
> >      int forced_idr;
> >      int low_delay_brc;
> > +    int max_qp_i;
> > +    int min_qp_i;
> > +    int max_qp_p;
> > +    int min_qp_p;
> > +    int max_qp_b;
> > +    int min_qp_b;
> >  } QSVEncContext;
> >
> >  int ff_qsv_enc_init(AVCodecContext *avctx, QSVEncContext *q);
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