[FFmpeg-devel] [PATCH] lavfi: Port fspp to FFmpeg

Stefano Sabatini stefasab at gmail.com
Fri Dec 19 02:13:01 CET 2014


On date Thursday 2014-12-18 13:57:27 +0530, arwa arif encoded:
[...]
> From 3da2573bb66205999cf170997a8d088ccb61c350 Mon Sep 17 00:00:00 2001
> From: Arwa Arif <arwaarif1994 at gmail.com>
> Date: Sun, 14 Dec 2014 12:03:31 +0530

> Subject: [PATCH] lavfi: port mp=uspp to a native libavfilter filter

mp=fspp

> 
> ---
>  LICENSE.md                        |    1 +
>  configure                         |    1 +
>  doc/filters.texi                  |   30 +
>  libavfilter/Makefile              |    1 +
>  libavfilter/allfilters.c          |    1 +
>  libavfilter/libmpcodecs/vf_fspp.c |    4 +-
>  libavfilter/version.h             |    4 +-
>  libavfilter/vf_fspp.c             |  672 ++++++++++++++++++
>  libavfilter/vf_fspp.h             |   96 +++
>  libavfilter/x86/Makefile          |    1 +
>  libavfilter/x86/vf_fspp.c         | 1405 +++++++++++++++++++++++++++++++++++++
>  11 files changed, 2212 insertions(+), 4 deletions(-)
>  create mode 100644 libavfilter/vf_fspp.c
>  create mode 100644 libavfilter/vf_fspp.h
>  create mode 100644 libavfilter/x86/vf_fspp.c
> 
> diff --git a/LICENSE.md b/LICENSE.md
> index cf9955f..188d060 100644
> --- a/LICENSE.md
> +++ b/LICENSE.md
> @@ -31,6 +31,7 @@ Specifically, the GPL parts of FFmpeg are:
>      - vf_cropdetect.c
>      - vf_decimate.c
>      - vf_delogo.c
> +    - vf_fspp.c
>      - vf_geq.c
>      - vf_histeq.c
>      - vf_hqdn3d.c
> diff --git a/configure b/configure
> index e37285a..29f5534 100755
> --- a/configure
> +++ b/configure
> @@ -2575,6 +2575,7 @@ ebur128_filter_deps="gpl"
>  flite_filter_deps="libflite"
>  frei0r_filter_deps="frei0r dlopen"
>  frei0r_src_filter_deps="frei0r dlopen"
> +fspp_filter_deps="gpl"
>  geq_filter_deps="gpl"
>  histeq_filter_deps="gpl"
>  hqdn3d_filter_deps="gpl"
> diff --git a/doc/filters.texi b/doc/filters.texi
> index 882caa0..8d2069e 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -4997,6 +4997,35 @@ frei0r=perspective:0.2/0.2|0.8/0.2
>  For more information, see
>  @url{http://frei0r.dyne.org}
>  
> + at section fspp
> +
> +Apply fast and simple postprocessing. It is a faster version of the simple
> +postprocessing filter - @ref{spp}.
> +

> +It splits (I)DCT into horizontal/vertical passes. Unlike Simple postprocessing
> +filter, one of them is performed once per block, not per pixel. This allows for
> +much better speed.

nit: unlike the simple postprocessing filter... allows for higher speed.

> +
> +The filter accepts the following options:
> +
> + at table @option
> + at item quality
> +Set quality. This option defines the number of levels for averaging. It accepts
> +an integer in the range 0-5. If set to @code{0}, the filter will have no
> +effect. A value of @code{5} means the higher quality. For each increment of
> +that value the speed drops by a factor of approximately 2.  Default value is
> + at code{4}.
> +
> + at item qp
> +Force a constant quantization parameter. It accepts an integer in range 0-63.
> +If not set, the filter will use the QP from the video stream (if available).
> +
> + at item use_bframe_qp
> +Enable the use of the QP from the B-Frames if set to @code{1}. Using this
> +option may cause flicker since the B-Frames have often larger QP. Default is
> + at code{0} (not enabled).
> + at end table
> +
>  @section geq
>  
>  The filter accepts the following options:
> @@ -8292,6 +8321,7 @@ stereo3d=abl:sbsr
>  @end example
>  @end itemize
>  
> + at anchor{spp}
>  @section spp
>  
>  Apply a simple postprocessing filter that compresses and decompresses the image
> diff --git a/libavfilter/Makefile b/libavfilter/Makefile
> index 6b7291e..8c523b4 100644
> --- a/libavfilter/Makefile
> +++ b/libavfilter/Makefile
> @@ -125,6 +125,7 @@ OBJS-$(CONFIG_FRAMESTEP_FILTER)              += vf_framestep.o
>  OBJS-$(CONFIG_FPS_FILTER)                    += vf_fps.o
>  OBJS-$(CONFIG_FRAMEPACK_FILTER)              += vf_framepack.o
>  OBJS-$(CONFIG_FREI0R_FILTER)                 += vf_frei0r.o
> +OBJS-$(CONFIG_FSPP_FILTER)                   += vf_fspp.o
>  OBJS-$(CONFIG_GEQ_FILTER)                    += vf_geq.o
>  OBJS-$(CONFIG_GRADFUN_FILTER)                += vf_gradfun.o
>  OBJS-$(CONFIG_HALDCLUT_FILTER)               += vf_lut3d.o dualinput.o framesync.o
> diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
> index adb86be..4a915c7 100644
> --- a/libavfilter/allfilters.c
> +++ b/libavfilter/allfilters.c
> @@ -141,6 +141,7 @@ void avfilter_register_all(void)
>      REGISTER_FILTER(FRAMEPACK,      framepack,      vf);
>      REGISTER_FILTER(FRAMESTEP,      framestep,      vf);
>      REGISTER_FILTER(FREI0R,         frei0r,         vf);
> +    REGISTER_FILTER(FSPP,           fspp,           vf);
>      REGISTER_FILTER(GEQ,            geq,            vf);
>      REGISTER_FILTER(GRADFUN,        gradfun,        vf);
>      REGISTER_FILTER(HALDCLUT,       haldclut,       vf);
> diff --git a/libavfilter/libmpcodecs/vf_fspp.c b/libavfilter/libmpcodecs/vf_fspp.c
> index d457859..3a80dc2 100644
> --- a/libavfilter/libmpcodecs/vf_fspp.c
> +++ b/libavfilter/libmpcodecs/vf_fspp.c
> @@ -710,8 +710,8 @@ const vf_info_t ff_vf_info_fspp = {
>  #if HAVE_MMX_INLINE
>  
>  DECLARE_ASM_CONST(8, uint64_t, MM_FIX_0_382683433)=FIX64(0.382683433, 14);
> -DECLARE_ALIGNED(8, uint64_t, ff_MM_FIX_0_541196100)=FIX64(0.541196100, 14);
> -DECLARE_ALIGNED(8, uint64_t, ff_MM_FIX_0_707106781)=FIX64(0.707106781, 14);
> +extern uint64_t ff_MM_FIX_0_707106781;
> +extern uint64_t ff_MM_FIX_0_541196100;
>  DECLARE_ASM_CONST(8, uint64_t, MM_FIX_1_306562965)=FIX64(1.306562965, 14);
>  
>  DECLARE_ASM_CONST(8, uint64_t, MM_FIX_1_414213562_A)=FIX64(1.414213562, 14);
> diff --git a/libavfilter/version.h b/libavfilter/version.h
> index 4bd18f3..50fc932 100644
> --- a/libavfilter/version.h
> +++ b/libavfilter/version.h
> @@ -30,8 +30,8 @@
>  #include "libavutil/version.h"
>  
>  #define LIBAVFILTER_VERSION_MAJOR  5
> -#define LIBAVFILTER_VERSION_MINOR  2
> -#define LIBAVFILTER_VERSION_MICRO 104
> +#define LIBAVFILTER_VERSION_MINOR  3
> +#define LIBAVFILTER_VERSION_MICRO 100
>  
>  #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
>                                                 LIBAVFILTER_VERSION_MINOR, \
> diff --git a/libavfilter/vf_fspp.c b/libavfilter/vf_fspp.c
> new file mode 100644
> index 0000000..6e76ce6
> --- /dev/null
> +++ b/libavfilter/vf_fspp.c
> @@ -0,0 +1,672 @@
> +/*
> + * Copyright (c) 2003 Michael Niedermayer <michaelni at gmx.at>
> + * Copyright (C) 2005 Nikolaj Poroshin <porosh3 at psu.ru>
> + * Copyright (c) 2014 Arwa Arif <arwaarif1994 at gmail.com>
> + *
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + */
> +
> +/**
> + * @file
> + * Fast Simple Post-processing filter
> + * This implementation is based on an algorithm described in
> + * "Aria Nosratinia Embedded Post-Processing for
> + * Enhancement of Compressed Images (1999)"
> + * (http://www.utdallas.edu/~aria/papers/vlsisp99.pdf)
> + * Further, with splitting (I)DCT into horizontal/vertical passes, one of
> + * them can be performed once per block, not per pixel. This allows for much
> + * better speed.
> + *
> + * Originally written by Michael Niedermayer and Nikolaj for the MPlayer
> + * project, and ported by Arwa Arif for FFmpeg.
> + */
> +
> +#include "libavutil/avassert.h"
> +#include "libavutil/imgutils.h"
> +#include "libavutil/opt.h"
> +#include "libavutil/pixdesc.h"
> +#include "internal.h"
> +#include "libavcodec/avcodec.h" //for reference to FF_QSCALE_TYPE
> +#include "vf_fspp.h"
> +
> +#define OFFSET(x) offsetof(FSPPContext, x)
> +#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
> +static const AVOption fspp_options[] = {
> +    { "quality",       "set quality",                          OFFSET(log2_count),    AV_OPT_TYPE_INT, {.i64 = 4}, 0, MAX_LEVEL, FLAGS },
> +    { "qp",            "force a constant quantizer parameter", OFFSET(qp),            AV_OPT_TYPE_INT, {.i64 = 0}, 0, 63,        FLAGS },
> +    { "use_bframe_qp", "use B-frames' QP",                     OFFSET(use_bframe_qp), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1,         FLAGS },
> +    { NULL }
> +};
> +
> +AVFILTER_DEFINE_CLASS(fspp);
> +
> +DECLARE_ALIGNED(32, static const uint8_t, dither)[8][8] = {
> +    {  0,  48,  12,  60,   3,  51,  15,  63, },
> +    { 32,  16,  44,  28,  35,  19,  47,  31, },
> +    {  8,  56,   4,  52,  11,  59,   7,  55, },
> +    { 40,  24,  36,  20,  43,  27,  39,  23, },
> +    {  2,  50,  14,  62,   1,  49,  13,  61, },
> +    { 34,  18,  46,  30,  33,  17,  45,  29, },
> +    { 10,  58,   6,  54,   9,  57,   5,  53, },
> +    { 42,  26,  38,  22,  41,  25,  37,  21, },
> +};
> +
> +static const short custom_threshold[64] = {
> +// values (296) can't be too high
> +// -it causes too big quant dependence
> +// or maybe overflow(check), which results in some flashing
> +     71, 296, 295, 237,  71,  40,  38,  19,
> +    245, 193, 185, 121, 102,  73,  53,  27,
> +    158, 129, 141, 107,  97,  73,  50,  26,
> +    102, 116, 109,  98,  82,  66,  45,  23,
> +     71,  94,  95,  81,  70,  56,  38,  20,
> +     56,  77,  74,  66,  56,  44,  30,  15,
> +     38,  53,  50,  45,  38,  30,  21,  11,
> +     20,  27,  26,  23,  20,  15,  11,   5
> +};
> +
> +static inline int norm_qscale(int qscale, int type)
> +{
> +    switch (type) {
> +    case FF_QSCALE_TYPE_MPEG1: return qscale;
> +    case FF_QSCALE_TYPE_MPEG2: return qscale >> 1;
> +    case FF_QSCALE_TYPE_H264:  return qscale >> 2;
> +    case FF_QSCALE_TYPE_VP56:  return (63 - qscale + 2) >> 2;
> +    }
> +    return qscale;
> +}
> +
> +//This func reads from 1 slice, 1 and clears 0 & 1
> +static void store_slice_c(uint8_t *dst, int16_t *src,
> +                          int dst_stride, int src_stride,
> +                          int width, int height, int log2_scale)
> +{
> +    int y, x;
> +#define STORE(pos)                                                             \
> +    temp = (src[x + pos] + (d[pos] >> log2_scale)) >> (6 - log2_scale);        \
> +    src[x + pos] = src[x + pos - 8 * src_stride] = 0;                          \
> +    if (temp & 0x100) temp = ~(temp >> 31);                                    \
> +    dst[x + pos] = temp;
> +
> +    for (y = 0; y < height; y++) {
> +        const uint8_t *d = dither[y];
> +        for (x = 0; x < width; x += 8) {
> +            int temp;
> +            STORE(0);
> +            STORE(1);
> +            STORE(2);
> +            STORE(3);
> +            STORE(4);
> +            STORE(5);
> +            STORE(6);
> +            STORE(7);
> +        }
> +        src += src_stride;
> +        dst += dst_stride;
> +    }
> +}
> +
> +//This func reads from 2 slices, 0 & 2  and clears 2-nd
> +static void store_slice2_c(uint8_t *dst, int16_t *src,
> +                           int dst_stride, int src_stride,
> +                           int width, int height, int log2_scale)
> +{
> +    int y, x;
> +#define STORE2(pos)                                                                                       \
> +    temp = (src[x + pos] + src[x + pos + 16 * src_stride] + (d[pos] >> log2_scale)) >> (6 - log2_scale);  \
> +    src[x + pos + 16 * src_stride] = 0;                                                                   \
> +    if (temp & 0x100) temp = ~(temp >> 31);                                                               \
> +    dst[x + pos] = temp;
> +
> +    for (y = 0; y < height; y++) {
> +        const uint8_t *d = dither[y];
> +        for (x = 0; x < width; x += 8) {
> +            int temp;
> +            STORE2(0);
> +            STORE2(1);
> +            STORE2(2);
> +            STORE2(3);
> +            STORE2(4);
> +            STORE2(5);
> +            STORE2(6);
> +            STORE2(7);
> +        }
> +        src += src_stride;
> +        dst += dst_stride;
> +    }
> +}
> +
> +static void mul_thrmat_c(FSPPContext *p, int q)
> +{
> +    int a;
> +    for (a = 0; a < 64; a++)
> +        ((int8_t*)p->threshold_mtx)[a] = q * ((int8_t*)p->threshold_mtx_noq)[a];//ints faster in C
> +}
> +
> +static void filter(FSPPContext *p, uint8_t *dst, uint8_t *src,
> +                   int dst_stride, int src_stride,
> +                   int width, int height,
> +                   uint8_t *qp_store, int qp_stride, int is_luma)
> +{
> +    int x, x0, y, es, qy, t;
> +
> +    const int stride = is_luma ? p->temp_stride : (width + 16);
> +    const int step = 6 - p->log2_count;
> +    const int qpsh = 4 - p->hsub * !is_luma;
> +    const int qpsv = 4 - p->vsub * !is_luma;
> +
> +    DECLARE_ALIGNED(32, int32_t, block_align)[4 * 8 * BLOCKSZ + 4 * 8 * BLOCKSZ];
> +    int16_t *block  = (int16_t *)block_align;
> +    int16_t *block3 = (int16_t *)(block_align + 4 * 8 * BLOCKSZ);
> +
> +    memset(block3, 0, 4 * 8 * BLOCKSZ);
> +
> +    if (!src || !dst) return;
> +
> +    for (y = 0; y < height; y++) {
> +        int index = 8 + 8 * stride + y * stride;
> +        memcpy(p->src + index, src + y * src_stride, width);
> +        for (x = 0; x < 8; x++) {
> +            p->src[index         - x - 1] = p->src[index +         x    ];
> +            p->src[index + width + x    ] = p->src[index + width - x - 1];
> +        }
> +    }
> +
> +    for (y = 0; y < 8; y++) {
> +        memcpy(p->src + (     7 - y    ) * stride, p->src + (     y + 8    ) * stride, stride);
> +        memcpy(p->src + (height + 8 + y) * stride, p->src + (height - y + 7) * stride, stride);
> +    }
> +    //FIXME (try edge emu)
> +
> +    for (y = 8; y < 24; y++)
> +        memset(p->temp + 8 + y * stride, 0, width * sizeof(int16_t));
> +
> +    for (y = step; y < height + 8; y += step) {    //step= 1,2
> +        const int y1 = y - 8 + step;                 //l5-7  l4-6;
> +        qy = y - 4;
> +
> +        if (qy > height - 1) qy = height - 1;
> +        if (qy < 0) qy = 0;
> +
> +        qy = (qy >> qpsv) * qp_stride;
> +        p->row_fdct(block, p->src + y * stride + 2 - (y&1), stride, 2);
> +
> +        for (x0 = 0; x0 < width + 8 - 8 * (BLOCKSZ - 1); x0 += 8 * (BLOCKSZ - 1)) {
> +            p->row_fdct(block + 8 * 8, p->src + y * stride + 8 + x0 + 2 - (y&1), stride, 2 * (BLOCKSZ - 1));
> +            if (p->qp)
> +                p->column_fidct((int16_t*)(&p->threshold_mtx[0]), block + 0 * 8, block3 + 0 * 8, 8 * (BLOCKSZ - 1)); //yes, this is a HOTSPOT
> +            else
> +                for (x = 0; x < 8 * (BLOCKSZ - 1); x += 8) {
> +                    t = x + x0 - 2;                    //correct t=x+x0-2-(y&1), but its the same
> +
> +                    if (t < 0) t = 0;                   //t always < width-2
> +
> +                    t = qp_store[qy + (t >> qpsh)];
> +                    t = norm_qscale(t, p->qscale_type);
> +
> +                    if (t != p->prev_q) p->prev_q = t, p->mul_thrmat(p, t);
> +                    p->column_fidct((int16_t*)(&p->threshold_mtx[0]), block + x * 8, block3 + x * 8, 8); //yes, this is a HOTSPOT
> +                }
> +            p->row_idct(block3 + 0 * 8, p->temp + (y & 15) * stride + x0 + 2 - (y & 1), stride, 2 * (BLOCKSZ - 1));
> +            memmove(block,  block  + (BLOCKSZ - 1) * 64, 8 * 8 * sizeof(int16_t)); //cycling
> +            memmove(block3, block3 + (BLOCKSZ - 1) * 64, 6 * 8 * sizeof(int16_t));
> +        }
> +        //
> +        es = width + 8 - x0; //  8, ...
> +        if (es > 8)
> +            p->row_fdct(block + 8 * 8, p->src + y * stride + 8 + x0 + 2 - (y & 1), stride, (es - 4) >> 2);
> +
> +        p->column_fidct((int16_t*)(&p->threshold_mtx[0]), block, block3, es&(~1));
> +        p->row_idct(block3 + 0 * 8, p->temp + (y & 15) * stride + x0 + 2 - (y & 1), stride, es >> 2);
> +
> +        if (!(y1 & 7) && y1) {
> +            if (y1 & 8)
> +                p->store_slice(dst + (y1 - 8) * dst_stride, p->temp + 8 + 8 * stride,
> +                               dst_stride, stride, width, 8, 5 - p->log2_count);
> +            else
> +                p->store_slice2(dst + (y1 - 8) * dst_stride, p->temp + 8 + 0 * stride,
> +                                dst_stride, stride, width, 8, 5 - p->log2_count);
> +        }
> +    }
> +
> +    if (y & 7) {  // == height & 7
> +        if (y & 8)
> +            p->store_slice(dst + ((y - 8) & ~7) * dst_stride, p->temp + 8 + 8 * stride,
> +                           dst_stride, stride, width, y&7, 5 - p->log2_count);
> +        else
> +            p->store_slice2(dst + ((y - 8) & ~7) * dst_stride, p->temp + 8 + 0 * stride,
> +                            dst_stride, stride, width, y&7, 5 - p->log2_count);
> +    }
> +}
> +
> +static void column_fidct_c(int16_t* thr_adr, int16_t *data, int16_t *output, int cnt)
> +{
> +    int_simd16_t tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
> +    int_simd16_t tmp10, tmp11, tmp12, tmp13;
> +    int_simd16_t z1,z2,z3,z4,z5, z10, z11, z12, z13;
> +    int_simd16_t d0, d1, d2, d3, d4, d5, d6, d7;
> +
> +    int16_t* dataptr;
> +    int16_t* wsptr;
> +    int16_t *threshold;
> +    int ctr;
> +
> +    dataptr = data;
> +    wsptr = output;
> +
> +    for (; cnt > 0; cnt -= 2) { //start positions
> +        threshold = (int16_t*)thr_adr;//threshold_mtx
> +        for (ctr = DCTSIZE; ctr > 0; ctr--) {
> +            // Process columns from input, add to output.
> +            tmp0 = dataptr[DCTSIZE * 0] + dataptr[DCTSIZE * 7];
> +            tmp7 = dataptr[DCTSIZE * 0] - dataptr[DCTSIZE * 7];
> +
> +            tmp1 = dataptr[DCTSIZE * 1] + dataptr[DCTSIZE * 6];
> +            tmp6 = dataptr[DCTSIZE * 1] - dataptr[DCTSIZE * 6];
> +
> +            tmp2 = dataptr[DCTSIZE * 2] + dataptr[DCTSIZE * 5];
> +            tmp5 = dataptr[DCTSIZE * 2] - dataptr[DCTSIZE * 5];
> +
> +            tmp3 = dataptr[DCTSIZE * 3] + dataptr[DCTSIZE * 4];
> +            tmp4 = dataptr[DCTSIZE * 3] - dataptr[DCTSIZE * 4];
> +
> +            // Even part of FDCT
> +
> +            tmp10 = tmp0 + tmp3;
> +            tmp13 = tmp0 - tmp3;
> +            tmp11 = tmp1 + tmp2;
> +            tmp12 = tmp1 - tmp2;
> +
> +            d0 = tmp10 + tmp11;
> +            d4 = tmp10 - tmp11;
> +
> +            z1 = MULTIPLY16H((tmp12 + tmp13) << 2, FIX_0_707106781);
> +            d2 = tmp13 + z1;
> +            d6 = tmp13 - z1;
> +
> +            // Even part of IDCT
> +
> +            THRESHOLD(tmp0, d0, threshold[0 * 8]);
> +            THRESHOLD(tmp1, d2, threshold[2 * 8]);
> +            THRESHOLD(tmp2, d4, threshold[4 * 8]);
> +            THRESHOLD(tmp3, d6, threshold[6 * 8]);
> +            tmp0 += 2;
> +            tmp10 = (tmp0 + tmp2) >> 2;
> +            tmp11 = (tmp0 - tmp2) >> 2;
> +
> +            tmp13 = (tmp1 + tmp3) >>2; //+2 !  (psnr decides)
> +            tmp12 = MULTIPLY16H((tmp1 - tmp3), FIX_1_414213562_A) - tmp13; //<<2
> +
> +            tmp0 = tmp10 + tmp13; //->temps
> +            tmp3 = tmp10 - tmp13; //->temps
> +            tmp1 = tmp11 + tmp12; //->temps
> +            tmp2 = tmp11 - tmp12; //->temps
> +
> +            // Odd part of FDCT
> +
> +            tmp10 = tmp4 + tmp5;
> +            tmp11 = tmp5 + tmp6;
> +            tmp12 = tmp6 + tmp7;
> +
> +            z5 = MULTIPLY16H((tmp10 - tmp12) << 2, FIX_0_382683433);
> +            z2 = MULTIPLY16H(tmp10 << 2, FIX_0_541196100) + z5;
> +            z4 = MULTIPLY16H(tmp12 << 2, FIX_1_306562965) + z5;
> +            z3 = MULTIPLY16H(tmp11 << 2, FIX_0_707106781);
> +
> +            z11 = tmp7 + z3;
> +            z13 = tmp7 - z3;
> +
> +            d5 = z13 + z2;
> +            d3 = z13 - z2;
> +            d1 = z11 + z4;
> +            d7 = z11 - z4;
> +
> +            // Odd part of IDCT
> +
> +            THRESHOLD(tmp4, d1, threshold[1 * 8]);
> +            THRESHOLD(tmp5, d3, threshold[3 * 8]);
> +            THRESHOLD(tmp6, d5, threshold[5 * 8]);
> +            THRESHOLD(tmp7, d7, threshold[7 * 8]);
> +
> +            //Simd version uses here a shortcut for the tmp5,tmp6,tmp7 == 0
> +            z13 = tmp6 + tmp5;
> +            z10 = (tmp6 - tmp5) << 1;
> +            z11 = tmp4 + tmp7;
> +            z12 = (tmp4 - tmp7) << 1;
> +
> +            tmp7  = (z11 + z13) >> 2; //+2 !
> +            tmp11 = MULTIPLY16H((z11 - z13) << 1, FIX_1_414213562);
> +            z5    = MULTIPLY16H(z10 + z12,        FIX_1_847759065);
> +            tmp10 = MULTIPLY16H(z12,              FIX_1_082392200) - z5;
> +            tmp12 = MULTIPLY16H(z10,              FIX_2_613125930) + z5; // - !!
> +
> +            tmp6 = tmp12 - tmp7;
> +            tmp5 = tmp11 - tmp6;
> +            tmp4 = tmp10 + tmp5;
> +
> +            wsptr[DCTSIZE * 0] +=  (tmp0 + tmp7);
> +            wsptr[DCTSIZE * 1] +=  (tmp1 + tmp6);
> +            wsptr[DCTSIZE * 2] +=  (tmp2 + tmp5);
> +            wsptr[DCTSIZE * 3] +=  (tmp3 - tmp4);
> +            wsptr[DCTSIZE * 4] +=  (tmp3 + tmp4);
> +            wsptr[DCTSIZE * 5] +=  (tmp2 - tmp5);
> +            wsptr[DCTSIZE * 6]  =  (tmp1 - tmp6);
> +            wsptr[DCTSIZE * 7]  =  (tmp0 - tmp7);
> +            //
> +            dataptr++; //next column
> +            wsptr++;
> +            threshold++;
> +        }
> +        dataptr += 8; //skip each second start pos
> +        wsptr   += 8;
> +    }
> +}
> +
> +static void row_idct_c(int16_t* workspace, int16_t* output_adr, int output_stride, int cnt)
> +{
> +    int_simd16_t tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
> +    int_simd16_t tmp10, tmp11, tmp12, tmp13;
> +    int_simd16_t z5, z10, z11, z12, z13;
> +    int16_t* outptr;
> +    int16_t* wsptr;
> +
> +    cnt *= 4;
> +    wsptr = workspace;
> +    outptr = output_adr;
> +    for (; cnt > 0; cnt--) {
> +        // Even part
> +        //Simd version reads 4x4 block and transposes it
> +        tmp10 = wsptr[2] +  wsptr[3];
> +        tmp11 = wsptr[2] -  wsptr[3];
> +
> +        tmp13 = wsptr[0] +  wsptr[1];
> +        tmp12 = (MULTIPLY16H(wsptr[0] - wsptr[1], FIX_1_414213562_A) << 2) - tmp13;//this shift order to avoid overflow
> +
> +        tmp0 = tmp10 + tmp13; //->temps
> +        tmp3 = tmp10 - tmp13; //->temps
> +        tmp1 = tmp11 + tmp12;
> +        tmp2 = tmp11 - tmp12;
> +
> +        // Odd part
> +        //Also transpose, with previous:
> +        // ---- ----      ||||
> +        // ---- ---- idct ||||
> +        // ---- ---- ---> ||||
> +        // ---- ----      ||||
> +        z13 = wsptr[4] + wsptr[5];
> +        z10 = wsptr[4] - wsptr[5];
> +        z11 = wsptr[6] + wsptr[7];
> +        z12 = wsptr[6] - wsptr[7];
> +
> +        tmp7 = z11 + z13;
> +        tmp11 = MULTIPLY16H(z11 - z13, FIX_1_414213562);
> +
> +        z5 =    MULTIPLY16H(z10 + z12, FIX_1_847759065);
> +        tmp10 = MULTIPLY16H(z12,       FIX_1_082392200) - z5;
> +        tmp12 = MULTIPLY16H(z10,       FIX_2_613125930) + z5; // - FIX_
> +
> +        tmp6 = (tmp12 << 3) - tmp7;
> +        tmp5 = (tmp11 << 3) - tmp6;
> +        tmp4 = (tmp10 << 3) + tmp5;
> +
> +        // Final output stage: descale and write column
> +        outptr[0 * output_stride] += DESCALE(tmp0 + tmp7, 3);
> +        outptr[1 * output_stride] += DESCALE(tmp1 + tmp6, 3);
> +        outptr[2 * output_stride] += DESCALE(tmp2 + tmp5, 3);
> +        outptr[3 * output_stride] += DESCALE(tmp3 - tmp4, 3);
> +        outptr[4 * output_stride] += DESCALE(tmp3 + tmp4, 3);
> +        outptr[5 * output_stride] += DESCALE(tmp2 - tmp5, 3);
> +        outptr[6 * output_stride] += DESCALE(tmp1 - tmp6, 3); //no += ?
> +        outptr[7 * output_stride] += DESCALE(tmp0 - tmp7, 3); //no += ?
> +        outptr++;
> +
> +        wsptr += DCTSIZE;       // advance pointer to next row
> +    }
> +}
> +
> +static void row_fdct_c(int16_t *data, const uint8_t *pixels, int line_size, int cnt)
> +{
> +    int_simd16_t tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
> +    int_simd16_t tmp10, tmp11, tmp12, tmp13;
> +    int_simd16_t z1, z2, z3, z4, z5, z11, z13;
> +    int16_t *dataptr;
> +
> +    cnt*=4;
> +    // Pass 1: process rows.
> +
> +    dataptr = data;
> +    for (; cnt > 0; cnt--) {
> +        tmp0 = pixels[line_size * 0] + pixels[line_size * 7];
> +        tmp7 = pixels[line_size * 0] - pixels[line_size * 7];
> +        tmp1 = pixels[line_size * 1] + pixels[line_size * 6];
> +        tmp6 = pixels[line_size * 1] - pixels[line_size * 6];
> +        tmp2 = pixels[line_size * 2] + pixels[line_size * 5];
> +        tmp5 = pixels[line_size * 2] - pixels[line_size * 5];
> +        tmp3 = pixels[line_size * 3] + pixels[line_size * 4];
> +        tmp4 = pixels[line_size * 3] - pixels[line_size * 4];
> +
> +        // Even part
> +
> +        tmp10 = tmp0 + tmp3;
> +        tmp13 = tmp0 - tmp3;
> +        tmp11 = tmp1 + tmp2;
> +        tmp12 = tmp1 - tmp2;
> +        //Even columns are written first, this leads to different order of columns
> +        //in column_fidct(), but they are processed independently, so all ok.
> +        //Later in the row_idct() columns readed at the same order.
> +        dataptr[2] = tmp10 + tmp11;
> +        dataptr[3] = tmp10 - tmp11;
> +
> +        z1 = MULTIPLY16H((tmp12 + tmp13) << 2, FIX_0_707106781);
> +        dataptr[0] = tmp13 + z1;
> +        dataptr[1] = tmp13 - z1;
> +
> +        // Odd part
> +
> +        tmp10 = (tmp4 + tmp5) << 2;
> +        tmp11 = (tmp5 + tmp6) << 2;
> +        tmp12 = (tmp6 + tmp7) << 2;
> +
> +        z5 = MULTIPLY16H(tmp10 - tmp12, FIX_0_382683433);
> +        z2 = MULTIPLY16H(tmp10,         FIX_0_541196100) + z5;
> +        z4 = MULTIPLY16H(tmp12,         FIX_1_306562965) + z5;
> +        z3 = MULTIPLY16H(tmp11,         FIX_0_707106781);
> +
> +        z11 = tmp7 + z3;
> +        z13 = tmp7 - z3;
> +
> +        dataptr[4] = z13 + z2;
> +        dataptr[5] = z13 - z2;
> +        dataptr[6] = z11 + z4;
> +        dataptr[7] = z11 - z4;
> +
> +        pixels++;               // advance pointer to next column
> +        dataptr += DCTSIZE;
> +    }
> +}
> +
> +static int query_formats(AVFilterContext *ctx)
> +{
> +    static const enum PixelFormat pix_fmts[] = {
> +        AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,
> +        AV_PIX_FMT_YUV420P,  AV_PIX_FMT_YUV411P,
> +        AV_PIX_FMT_YUV410P,  AV_PIX_FMT_YUV440P,
> +        AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
> +        AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ440P,
> +        AV_PIX_FMT_NONE
> +    };
> +    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
> +    return 0;
> +}
> +

> +static int config_input(AVFilterLink *inlink)
> +{
> +

nit++: drop empty line

> +    AVFilterContext *ctx = inlink->dst;
> +    FSPPContext *fspp = ctx->priv;
> +    const int h = FFALIGN(inlink->h + 16, 16);
> +    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
> +
> +    fspp->hsub = desc->log2_chroma_w;
> +    fspp->vsub = desc->log2_chroma_h;
> +
> +    fspp->temp_stride = FFALIGN(inlink->w + 16, 16);
> +    fspp->temp = av_malloc_array(fspp->temp_stride, h * sizeof(*fspp->temp));
> +    fspp->src  = av_malloc_array(fspp->temp_stride, h * sizeof(*fspp->src));
> +
> +    if (!fspp->temp || !fspp->src)
> +        return AVERROR(ENOMEM);
> +

[...]

Looks nice to me otherwise, considering also the fixes suggested by
Michael.

Note: as usual you can prepare a patch to remove the corresponding mp
filter once this is accepted).

Second note: not sure if we should also port mp=pp7 or do something
else (I remember Clement suggested to move it to the general pp
filter).

Michael, Clement, others: opinions?
-- 
FFmpeg = Fiendish & Fundamental Martial Patchable Ermetic God


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