Re: [PATCH v2 3/7] media: hantro: postproc: Fix buffer size calculation

[Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>]

Hi Nicolas, Jernej,

On Tue, Jun 28, 2022 at 04:06:13PM -0400, Nicolas Dufresne wrote:
> Le mardi 28 juin 2022 à 18:13 +0200, Jernej Škrabec a écrit :
> > Dne torek, 28. junij 2022 ob 17:54:19 CEST je Ezequiel Garcia napisal(a):
> > > Hi Jernej,
> > > 
> > > On Thu, Jun 16, 2022 at 10:25:09PM +0200, Jernej Skrabec wrote:
> > > > When allocating aux buffers for postprocessing, it's assumed that base
> > > > buffer size is the same as that of output. Coincidentally, that's true
> > > > most of the time, but not always. 10-bit source also needs aux buffer
> > > > size which is appropriate for 10-bit native format, even if the output
> > > > format is 8-bit. Similarly, mv sizes and other extra buffer size also
> > > > depends on source width/height, not destination.
> > > > 
> > > > Reviewed-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
> > > 
> > > I took a new look at this patch.
> > > 
> > > > Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
> > > > ---
> > > > 
> > > >  .../staging/media/hantro/hantro_postproc.c    | 24 +++++++++++++------
> > > >  drivers/staging/media/hantro/hantro_v4l2.c    |  2 +-
> > > >  drivers/staging/media/hantro/hantro_v4l2.h    |  2 ++
> > > >  3 files changed, 20 insertions(+), 8 deletions(-)
> > > > 
> > > > diff --git a/drivers/staging/media/hantro/hantro_postproc.c
> > > > b/drivers/staging/media/hantro/hantro_postproc.c index
> > > > ab168c1c0d28..b77cc55e43ea 100644
> > > > --- a/drivers/staging/media/hantro/hantro_postproc.c
> > > > +++ b/drivers/staging/media/hantro/hantro_postproc.c
> > > > @@ -12,6 +12,7 @@
> > > > 
> > > >  #include "hantro_hw.h"
> > > >  #include "hantro_g1_regs.h"
> > > >  #include "hantro_g2_regs.h"
> > > > 
> > > > +#include "hantro_v4l2.h"
> > > > 
> > > >  #define HANTRO_PP_REG_WRITE(vpu, reg_name, val) \
> > > >  { \
> > > > 
> > > > @@ -174,18 +175,27 @@ int hantro_postproc_alloc(struct hantro_ctx *ctx)
> > > > 
> > > >  	struct v4l2_m2m_ctx *m2m_ctx = ctx->fh.m2m_ctx;
> > > >  	struct vb2_queue *cap_queue = &m2m_ctx->cap_q_ctx.q;
> > > >  	unsigned int num_buffers = cap_queue->num_buffers;
> > > > 
> > > > +	struct v4l2_pix_format_mplane pix_mp;
> > > > +	const struct hantro_fmt *fmt;
> > > > 
> > > >  	unsigned int i, buf_size;
> > > > 
> > > > -	buf_size = ctx->dst_fmt.plane_fmt[0].sizeimage;
> > > > +	/* this should always pick native format */
> > > > +	fmt = hantro_get_default_fmt(ctx, false);
> > > 
> > > Clearly this is correct.
> > > 
> > > When the driver enables the post-processor it decodes a coded format (H264,
> > > etc.) to a native format (NV12_4L4 or P010_4L4) and feeds this into the
> > > postprocessor engine to produce some other format (YUYV, NV12, etc.).
> > > 
> > > The buffers allocated here should be taken from the native format,
> > > so it's correct to use hantro_get_default_fmt().
> > > 
> > > > +	if (!fmt)
> > > > +		return -EINVAL;
> > > > +	v4l2_fill_pixfmt_mp(&pix_mp, fmt->fourcc, ctx->src_fmt.width,
> > > > +			    ctx->src_fmt.height);
> > > 
> > > The issue comes at this point, where we negotiate the buffer size based on
> > > the source size (OUTPUT queue size), instead of negotiating based
> > > on the Native size.
> > > 
> > >   Coded -> [ Decoder ] -> Native -> [ Post-processor ] -> Decoded
> > 
> > I'm not sure what is the difference between source and native size? You mean 
> > one coded in controls and one set via output format? IMO they should always be 
> > the same, otherwise it can be considered a bug in userspace application.
> 
> Indeed the src_fmt should use coded width/height (as per spec). The driver will
> then adapt to its own requirement resulting into the "native" width height being
> returned. Notice that s_ctrl() should fail in case of miss-match (this is CODEC
> specific), or streamon() should fail if the codec specific control have never
> been set (as we always initialise this, it will fail due to default being an
> invalid value anyway).
> 
> As a side effect, when userland read the default format (G_FMT(CAPTURE), the
> width/height should match the src_dst for this driver. This is the native size.
> The optional path that this driver enables is enumeration of CAPTURE format and
> frame sizes, combined with to select from these. The driver will create a
> secondary set of buffers in the case.
> 

OK, the patch looks good then.

Thanks,
Ezequiel

> Nicolas
> 
> > 
> > Best regards,
> > Jernej
> > 
> > > 
> > > So, while the patch is surely improving things, I wonder if it won't
> > > cause other issues.
> > > 
> > > This reminds me we are still lacking a more complete test-suite for this
> > > driver, so that we can validate changes and ensure there are no
> > > regressions.
> > > 
> > > Perhaps we could hack Fluster to not only test the conformance,
> > > but also test the post-processor?
> > > 
> > > Thanks,
> > > Ezequiel
> > > 
> > > > +
> > > > +	buf_size = pix_mp.plane_fmt[0].sizeimage;
> > > > 
> > > >  	if (ctx->vpu_src_fmt->fourcc == V4L2_PIX_FMT_H264_SLICE)
> > > > 
> > > > -		buf_size += hantro_h264_mv_size(ctx->dst_fmt.width,
> > > > -						ctx-
> > > dst_fmt.height);
> > > > +		buf_size += hantro_h264_mv_size(pix_mp.width,
> > > > +						
> > pix_mp.height);
> > > > 
> > > >  	else if (ctx->vpu_src_fmt->fourcc == V4L2_PIX_FMT_VP9_FRAME)
> > > > 
> > > > -		buf_size += hantro_vp9_mv_size(ctx->dst_fmt.width,
> > > > -					       ctx-
> > > dst_fmt.height);
> > > > +		buf_size += hantro_vp9_mv_size(pix_mp.width,
> > > > +					       pix_mp.height);
> > > > 
> > > >  	else if (ctx->vpu_src_fmt->fourcc == V4L2_PIX_FMT_HEVC_SLICE)
> > > > 
> > > > -		buf_size += hantro_hevc_mv_size(ctx->dst_fmt.width,
> > > > -						ctx-
> > > dst_fmt.height);
> > > > +		buf_size += hantro_hevc_mv_size(pix_mp.width,
> > > > +						
> > pix_mp.height);
> > > > 
> > > >  	for (i = 0; i < num_buffers; ++i) {
> > > >  	
> > > >  		struct hantro_aux_buf *priv = &ctx->postproc.dec_q[i];
> > > > 
> > > > diff --git a/drivers/staging/media/hantro/hantro_v4l2.c
> > > > b/drivers/staging/media/hantro/hantro_v4l2.c index
> > > > 334f18a4120d..2c7a805289e7 100644
> > > > --- a/drivers/staging/media/hantro/hantro_v4l2.c
> > > > +++ b/drivers/staging/media/hantro/hantro_v4l2.c
> > > > @@ -118,7 +118,7 @@ hantro_find_format(const struct hantro_ctx *ctx, u32
> > > > fourcc)> 
> > > >  	return NULL;
> > > >  
> > > >  }
> > > > 
> > > > -static const struct hantro_fmt *
> > > > +const struct hantro_fmt *
> > > > 
> > > >  hantro_get_default_fmt(const struct hantro_ctx *ctx, bool bitstream)
> > > >  {
> > > >  
> > > >  	const struct hantro_fmt *formats;
> > > > 
> > > > diff --git a/drivers/staging/media/hantro/hantro_v4l2.h
> > > > b/drivers/staging/media/hantro/hantro_v4l2.h index
> > > > b17e84c82582..64f6f57e9d7a 100644
> > > > --- a/drivers/staging/media/hantro/hantro_v4l2.h
> > > > +++ b/drivers/staging/media/hantro/hantro_v4l2.h
> > > > @@ -23,5 +23,7 @@ extern const struct vb2_ops hantro_queue_ops;
> > > > 
> > > >  void hantro_reset_fmts(struct hantro_ctx *ctx);
> > > >  int hantro_get_format_depth(u32 fourcc);
> > > > 
> > > > +const struct hantro_fmt *
> > > > +hantro_get_default_fmt(const struct hantro_ctx *ctx, bool bitstream);
> > > > 
> > > >  #endif /* HANTRO_V4L2_H_ */
> > 
> > 
> > 
> > 
> 

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