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From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH] ffv1: implement remap for encode/decode_plane()
Date: Sat, 15 Mar 2025 01:34:41 +0100
Message-ID: <20250315003441.GO4991@pb2> (raw)
In-Reply-To: <02eb0006-be20-446e-979a-916f1e81e75d@gmail.com>


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On Tue, Mar 11, 2025 at 04:06:58PM -0300, James Almer wrote:
> 
> 
> On 3/11/2025 11:13 AM, James Almer wrote:
> > On 3/10/2025 9:59 PM, Michael Niedermayer wrote:
> > > On Mon, Mar 10, 2025 at 06:48:29PM +0100, Lynne wrote:
> > > > On 10/03/2025 01:45, Michael Niedermayer wrote:
> > > > > Sponsored-by: Sovereign Tech Fund
> > > > > Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> > > > > ---
> > > > >    libavcodec/ffv1dec.c | 20 ++++++++-----
> > > > >    libavcodec/ffv1enc.c | 67
> > > > > +++++++++++++++++++++++++++++++++++++ +------
> > > > >    2 files changed, 71 insertions(+), 16 deletions(-)
> > > > > 
> > > > > diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c
> > > > > index 9738e4e9c9f..72c93fcf0cd 100644
> > > > > --- a/libavcodec/ffv1dec.c
> > > > > +++ b/libavcodec/ffv1dec.c
> > > > > @@ -92,7 +92,7 @@ static int is_input_end(RangeCoder *c,
> > > > > GetBitContext *gb, int ac)
> > > > >    static int decode_plane(FFV1Context *f, FFV1SliceContext *sc,
> > > > >                            GetBitContext *gb,
> > > > >                            uint8_t *src, int w, int h, int
> > > > > stride, int plane_index,
> > > > > -                        int pixel_stride, int ac)
> > > > > +                        int remap_index, int pixel_stride, int ac)
> > > > >    {
> > > > >        int x, y;
> > > > >        int16_t *sample[2];
> > > > > @@ -116,12 +116,18 @@ static int decode_plane(FFV1Context
> > > > > *f, FFV1SliceContext *sc,
> > > > >                int ret = decode_line(f, sc, gb, w, sample,
> > > > > plane_index, 8, ac);
> > > > >                if (ret < 0)
> > > > >                    return ret;
> > > > > +            if (sc->remap)
> > > > > +                for (x = 0; x < w; x++)
> > > > > +                    sample[1][x] = sc->fltmap[remap_index]
> > > > > [sample[1][x]];
> > > > >                for (x = 0; x < w; x++)
> > > > >                    src[x*pixel_stride + stride * y] = sample[1][x];
> > > > >            } else {
> > > > >                int ret = decode_line(f, sc, gb, w, sample,
> > > > > plane_index, f->avctx->bits_per_raw_sample, ac);
> > > > >                if (ret < 0)
> > > > >                    return ret;
> > > > > +            if (sc->remap)
> > > > > +                for (x = 0; x < w; x++)
> > > > > +                    sample[1][x] = sc->fltmap[remap_index]
> > > > > [sample[1][x]];
> > > > >                if (f->packed_at_lsb) {
> > > > >                    for (x = 0; x < w; x++) {
> > > > >                        ((uint16_t*)(src +
> > > > > stride*y))[x*pixel_stride] = sample[1][x];
> > > > > @@ -347,17 +353,17 @@ static int decode_slice(AVCodecContext
> > > > > *c, void *arg)
> > > > >        if (f->colorspace == 0 && (f->chroma_planes || !f-
> > > > > >transparency)) {
> > > > >            const int cx            = x >> f->chroma_h_shift;
> > > > >            const int cy            = y >> f->chroma_v_shift;
> > > > > -        decode_plane(f, sc, &gb, p->data[0] + ps*x + y*p-
> > > > > >linesize[0], width, height, p->linesize[0], 0, 1, ac);
> > > > > +        decode_plane(f, sc, &gb, p->data[0] + ps*x + y*p-
> > > > > >linesize[0], width, height, p->linesize[0], 0, 0, 1, ac);
> > > > >            if (f->chroma_planes) {
> > > > > -            decode_plane(f, sc, &gb, p->data[1] +
> > > > > ps*cx+cy*p- >linesize[1], chroma_width, chroma_height,
> > > > > p->linesize[1], 1, 1, ac);
> > > > > -            decode_plane(f, sc, &gb, p->data[2] +
> > > > > ps*cx+cy*p- >linesize[2], chroma_width, chroma_height,
> > > > > p->linesize[2], 1, 1, ac);
> > > > > +            decode_plane(f, sc, &gb, p->data[1] +
> > > > > ps*cx+cy*p- >linesize[1], chroma_width, chroma_height,
> > > > > p->linesize[1], 1, 1, 1, ac);
> > > > > +            decode_plane(f, sc, &gb, p->data[2] +
> > > > > ps*cx+cy*p- >linesize[2], chroma_width, chroma_height,
> > > > > p->linesize[2], 1, 2, 1, ac);
> > > > >            }
> > > > >            if (f->transparency)
> > > > > -            decode_plane(f, sc, &gb, p->data[3] + ps*x +
> > > > > y*p- >linesize[3], width, height, p->linesize[3],
> > > > > (f->version >= 4 && !f- >chroma_planes) ? 1 : 2, 1, ac);
> > > > > +            decode_plane(f, sc, &gb, p->data[3] + ps*x +
> > > > > y*p- >linesize[3], width, height, p->linesize[3],
> > > > > (f->version >= 4 && !f- >chroma_planes) ? 1 : 2, 2, 1, ac);
> > > > >        } else if (f->colorspace == 0) {
> > > > > -         decode_plane(f, sc, &gb, p->data[0] + ps*x + y*p-
> > > > > >linesize[0]    , width, height, p->linesize[0], 0, 2, ac);
> > > > > -         decode_plane(f, sc, &gb, p->data[0] + ps*x + y*p-
> > > > > >linesize[0] + 1, width, height, p->linesize[0], 1, 2, ac);
> > > > > +         decode_plane(f, sc, &gb, p->data[0] + ps*x + y*p-
> > > > > >linesize[0]    , width, height, p->linesize[0], 0, 0, 2,
> > > > > ac);
> > > > > +         decode_plane(f, sc, &gb, p->data[0] + ps*x + y*p-
> > > > > >linesize[0] + 1, width, height, p->linesize[0], 1, 1, 2,
> > > > > ac);
> > > > >        } else if (f->use32bit) {
> > > > >            uint8_t *planes[4] = { p->data[0] + ps * x + y *
> > > > > p- >linesize[0],
> > > > >                                   p->data[1] + ps * x + y *
> > > > > p- >linesize[1],
> > > > > diff --git a/libavcodec/ffv1enc.c b/libavcodec/ffv1enc.c
> > > > > index f3041219b71..4c55c01263b 100644
> > > > > --- a/libavcodec/ffv1enc.c
> > > > > +++ b/libavcodec/ffv1enc.c
> > > > > @@ -272,7 +272,7 @@ static inline void
> > > > > put_vlc_symbol(PutBitContext *pb, VlcState *const state,
> > > > >    static int encode_plane(FFV1Context *f, FFV1SliceContext *sc,
> > > > >                            const uint8_t *src, int w, int h,
> > > > > -                         int stride, int plane_index, int
> > > > > pixel_stride, int ac)
> > > > > +                        int stride, int plane_index, int
> > > > > remap_index, int pixel_stride, int ac)
> > > > >    {
> > > > >        int x, y, i, ret;
> > > > >        const int pass1 = !!(f->avctx->flags & AV_CODEC_FLAG_PASS1);
> > > > > @@ -288,9 +288,14 @@ static int encode_plane(FFV1Context *f,
> > > > > FFV1SliceContext *sc,
> > > > >            sample[0][-1]= sample[1][0  ];
> > > > >            sample[1][ w]= sample[1][w-1];
> > > > > +
> > > > >            if (f->bits_per_raw_sample <= 8) {
> > > > >                for (x = 0; x < w; x++)
> > > > >                    sample[0][x] = src[x * pixel_stride + stride * y];
> > > > > +            if (sc->remap)
> > > > > +                for (x = 0; x < w; x++)
> > > > > +                    sample[0][x] = sc->fltmap[remap_index]
> > > > > [ sample[0][x] ];
> > > > > +
> > > > >                if((ret = encode_line(f, sc, f->avctx, w,
> > > > > sample, plane_index, 8, ac, pass1)) < 0)
> > > > >                    return ret;
> > > > >            } else {
> > > > > @@ -303,6 +308,10 @@ static int encode_plane(FFV1Context *f,
> > > > > FFV1SliceContext *sc,
> > > > >                        sample[0][x] = ((uint16_t*)(src +
> > > > > stride*y)) [x] >> (16 - f->bits_per_raw_sample);
> > > > >                    }
> > > > >                }
> > > > > +            if (sc->remap)
> > > > > +                for (x = 0; x < w; x++)
> > > > > +                    sample[0][x] = sc->fltmap[remap_index]
> > > > > [ sample[0][x] ];
> > > > > +
> > > > >                if((ret = encode_line(f, sc, f->avctx, w,
> > > > > sample, plane_index, f->bits_per_raw_sample, ac, pass1)) <
> > > > > 0)
> > > > >                    return ret;
> > > > >            }
> > > > > @@ -310,6 +319,30 @@ static int encode_plane(FFV1Context *f,
> > > > > FFV1SliceContext *sc,
> > > > >        return 0;
> > > > >    }
> > > > > +static void load_plane(FFV1Context *f, FFV1SliceContext *sc,
> > > > > +                      const uint8_t *src, int w, int h,
> > > > > +                      int stride, int remap_index, int pixel_stride)
> > > > > +{
> > > > > +    int x, y;
> > > > > +
> > > > > +    memset(sc->fltmap[remap_index], 0, sizeof(sc-
> > > > > >fltmap[remap_index]));
> > > > > +
> > > > > +    for (y = 0; y < h; y++) {
> > > > > +        if (f->bits_per_raw_sample <= 8) {
> > > > > +            for (x = 0; x < w; x++)
> > > > > +                sc->fltmap[remap_index][ src[x *
> > > > > pixel_stride + stride * y] ] = 1;
> > > > > +        } else {
> > > > > +            if (f->packed_at_lsb) {
> > > > > +                for (x = 0; x < w; x++)
> > > > > +                    sc->fltmap[remap_index][
> > > > > ((uint16_t*)(src + stride*y))[x] ] = 1;
> > > > > +            } else {
> > > > > +                for (x = 0; x < w; x++)
> > > > > +                    sc->fltmap[remap_index][
> > > > > ((uint16_t*)(src + stride*y))[x] >> (16 -
> > > > > f->bits_per_raw_sample) ] = 1;
> > > > > +            }
> > > > > +        }
> > > > > +    }
> > > > > +}
> > > > > +
> > > > >    static void write_quant_table(RangeCoder *c, int16_t *quant_table)
> > > > >    {
> > > > >        int last = 0;
> > > > > @@ -1178,8 +1211,24 @@ retry:
> > > > >        }
> > > > >        if (sc->remap) {
> > > > > -        if (f->colorspace == 0) {
> > > > > -            av_assert0(0);
> > > > > +        if (f->colorspace == 0 && c->pix_fmt != AV_PIX_FMT_YA8) {
> > > > > +            const int cx            = x >> f->chroma_h_shift;
> > > > > +            const int cy            = y >> f->chroma_v_shift;
> > > > > +
> > > > > +            //TODO decide on the order for the encoded
> > > > > remaps and loads. with golomb rice it
> > > > > +            // easier to have all range coded ones
> > > > > together, otherwise it may be nicer to handle each plane as
> > > > > a whole?
> > > > > +
> > > > > +            load_plane(f, sc, p->data[0] + ps*x +
> > > > > y*p->linesize[0], width, height, p->linesize[0], 0, 1);
> > > > > +
> > > > > +            if (f->chroma_planes) {
> > > > > +                load_plane(f, sc, p->data[1] + ps*cx+cy*p-
> > > > > >linesize[1], chroma_width, chroma_height, p->linesize[1],
> > > > > 1, 1);
> > > > > +                load_plane(f, sc, p->data[2] + ps*cx+cy*p-
> > > > > >linesize[2], chroma_width, chroma_height, p->linesize[2],
> > > > > 2, 1);
> > > > > +            }
> > > > > +            if (f->transparency)
> > > > > +                load_plane(f, sc, p->data[3] + ps*x + y*p-
> > > > > >linesize[3], width, height, p->linesize[3], 3, 1);
> > > > > +        } else if (c->pix_fmt == AV_PIX_FMT_YA8) {
> > > > > +            load_plane(f, sc, p->data[0] +     ps*x + y*p-
> > > > > >linesize[0], width, height, p->linesize[0], 0, 2);
> > > > > +            load_plane(f, sc, p->data[0] + 1 + ps*x + y*p-
> > > > > >linesize[0], width, height, p->linesize[0], 1, 2);
> > > > >            } else if (f->use32bit) {
> > > > >                load_rgb_frame32(f, sc, planes, width,
> > > > > height, p- >linesize);
> > > > >            } else
> > > > > @@ -1206,17 +1255,17 @@ retry:
> > > > >            const int cx            = x >> f->chroma_h_shift;
> > > > >            const int cy            = y >> f->chroma_v_shift;
> > > > > -        ret = encode_plane(f, sc, p->data[0] + ps*x + y*p-
> > > > > >linesize[0], width, height, p->linesize[0], 0, 1, ac);
> > > > > +        ret = encode_plane(f, sc, p->data[0] + ps*x + y*p-
> > > > > >linesize[0], width, height, p->linesize[0], 0, 0, 1, ac);
> > > > >            if (f->chroma_planes) {
> > > > > -            ret |= encode_plane(f, sc, p->data[1] +
> > > > > ps*cx+cy*p- >linesize[1], chroma_width, chroma_height,
> > > > > p->linesize[1], 1, 1, ac);
> > > > > -            ret |= encode_plane(f, sc, p->data[2] +
> > > > > ps*cx+cy*p- >linesize[2], chroma_width, chroma_height,
> > > > > p->linesize[2], 1, 1, ac);
> > > > > +            ret |= encode_plane(f, sc, p->data[1] +
> > > > > ps*cx+cy*p- >linesize[1], chroma_width, chroma_height,
> > > > > p->linesize[1], 1, 1, 1, ac);
> > > > > +            ret |= encode_plane(f, sc, p->data[2] +
> > > > > ps*cx+cy*p- >linesize[2], chroma_width, chroma_height,
> > > > > p->linesize[2], 1, 2, 1, ac);
> > > > >            }
> > > > >            if (f->transparency)
> > > > > -            ret |= encode_plane(f, sc, p->data[3] + ps*x +
> > > > > y*p- >linesize[3], width, height, p->linesize[3], 2, 1, ac);
> > > > > +            ret |= encode_plane(f, sc, p->data[3] + ps*x +
> > > > > y*p- >linesize[3], width, height, p->linesize[3], 2, 3, 1,
> > > > > ac);
> > > > >        } else if (c->pix_fmt == AV_PIX_FMT_YA8) {
> > > > > -        ret  = encode_plane(f, sc, p->data[0] +     ps*x +
> > > > > y*p- >linesize[0], width, height, p->linesize[0], 0, 2, ac);
> > > > > -        ret |= encode_plane(f, sc, p->data[0] + 1 + ps*x +
> > > > > y*p- >linesize[0], width, height, p->linesize[0], 1, 2, ac);
> > > > > +        ret  = encode_plane(f, sc, p->data[0] +     ps*x +
> > > > > y*p- >linesize[0], width, height, p->linesize[0], 0, 0, 2,
> > > > > ac);
> > > > > +        ret |= encode_plane(f, sc, p->data[0] + 1 + ps*x +
> > > > > y*p- >linesize[0], width, height, p->linesize[0], 1, 1, 2,
> > > > > ac);
> > > > >        } else if (f->use32bit) {
> > > > >            ret = encode_rgb_frame32(f, sc, planes, width,
> > > > > height, p- >linesize, ac);
> > > > >        } else {
> > > > 
> > > > Doesn't apply properly.
> > > > What does it even do? Does the current git master not already do this?
> > > 
> > > master implements remap for encode_rgb_frame*
> > > This implements it for the other cases.
> > > Most of this is untested though, i have no YUV planar float16 material
> > There is one very tiny exr sample that's YA float16, the one from fate-
> > exr-ya-scanline-zip-half-12x8. Not sure how useful can it be considering
> > it's so small and has no chroma planes.
> 
> There's also https://raw.githubusercontent.com/AcademySoftwareFoundation/openexr-images/main/LuminanceChroma/Garden.exr
> which is grayf16.

patches sent to support these

thx

[...]

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Modern terrorism, a quick summary: Need oil, start war with country that
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      reply	other threads:[~2025-03-15  0:34 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-03-10  0:45 Michael Niedermayer
2025-03-10 17:48 ` Lynne
2025-03-11  0:59   ` Michael Niedermayer
2025-03-11 14:13     ` James Almer
2025-03-11 19:06       ` James Almer
2025-03-15  0:34         ` Michael Niedermayer [this message]

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