[FFmpeg-devel] [PATCH] lavfi: USPP filter
arwa arif
arwaarif1994 at gmail.com
Tue Dec 9 06:35:05 CET 2014
On Tue, Dec 9, 2014 at 5:48 AM, Michael Niedermayer <michaelni at gmx.at>
wrote:
> On Mon, Dec 08, 2014 at 11:15:10PM +0530, arwa arif wrote:
> [...]
> > doc/filters.texi | 24 ++
> > libavfilter/Makefile | 1
> > libavfilter/allfilters.c | 1
> > libavfilter/vf_uspp.c | 514
> +++++++++++++++++++++++++++++++++++++++++++++++
> > libavfilter/vf_uspp.h | 55 +++++
> > 5 files changed, 594 insertions(+), 1 deletion(-)
> > 128eed16f074aa1448d37eea1d32c9bcb10c3796 0001-lavfi-USPP-Filter.patch
> > From 0e2778bd848cff1ac4ea5125354c27a4bfcaee1b Mon Sep 17 00:00:00 2001
> > From: Arwa Arif <arwaarif1994 at gmail.com>
> > Date: Sun, 7 Dec 2014 18:56:46 +0530
> > Subject: [PATCH] lavfi: USPP Filter
> >
> > ---
> > doc/filters.texi | 24 ++-
> > libavfilter/Makefile | 1 +
> > libavfilter/allfilters.c | 1 +
> > libavfilter/vf_uspp.c | 514
> ++++++++++++++++++++++++++++++++++++++++++++++
> > libavfilter/vf_uspp.h | 55 +++++
> > 5 files changed, 594 insertions(+), 1 deletion(-)
> > create mode 100644 libavfilter/vf_uspp.c
> > create mode 100644 libavfilter/vf_uspp.h
> >
> > diff --git a/doc/filters.texi b/doc/filters.texi
> > index 8c16c7a..322899d 100644
> > --- a/doc/filters.texi
> > +++ b/doc/filters.texi
> > @@ -6120,7 +6120,6 @@ The list of the currently supported filters
> follows:
> > @item ilpack
> > @item pp7
> > @item softpulldown
> > - at item uspp
> > @end table
> >
> > The parameter syntax and behavior for the listed filters are the same
> > @@ -8804,6 +8803,29 @@ unsharp=7:7:-2:7:7:-2
> > @end example
> > @end itemize
> >
> > + at section uspp
> > +
> > +Apply ultra slow/simple postprocessing filter that compresses and
> decompresses
> > +the image at several (or - in the case of @option{quality} level
> @code{8} - all)
> > +shifts and average the results.The way this differs from the behavior
> of spp is
> > +that uspp actually encodes & decodes each case with libavcodec Snow,
> whereas spp
> > +uses a simplified intra only 8x8 DCT similar to MJPEG.
> > +
> > +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 0-8. If set to @code{0}, the filter will have no
> > +effect. A value of @code{8} means the higher quality. For each
> increment of
> > +that value the speed drops by a factor of approximately 2. Default
> value is
> > + at code{3}.
> > +
> > + at item qp
> > +Force a constant quantization parameter. If not set, the filter will
> use the QP
> > +from the video stream (if available).
> > + at end table
> > +
>
> [...]
>
> > +static void hardthresh_c(int16_t dst[DEST_SIZE], const int16_t
> src[DEST_SIZE],
> > + int qp, const uint8_t *permutation)
> > +{
> > + int i;
> > + int bias = 0; // FIXME
> > +
> > + unsigned threshold1 = qp * ((1<<4) - bias) - 1;
> > + unsigned threshold2 = threshold1 << 1;
> > +
> > + memset(dst, 0, DEST_SIZE * sizeof(dst[0]));
> > + dst[0] = (src[0] + 4) >> 3;
> > +
> > + for (i = 1; i < DEST_SIZE; i++) {
> > + int level = src[i];
> > + if (((unsigned)(level + threshold1)) > threshold2) {
> > + const int j = permutation[i];
> > + dst[j] = (level + 4) >> 3;
> > + }
> > + }
> > +}
> > +
> > +static void softthresh_c(int16_t dst[DEST_SIZE], const int16_t
> src[DEST_SIZE],
> > + int qp, const uint8_t *permutation)
> > +{
> > + int i;
> > + int bias = 0; //FIXME
> > +
> > + unsigned threshold1 = qp * ((1<<4) - bias) - 1;
> > + unsigned threshold2 = threshold1 << 1;
> > +
> > + memset(dst, 0, DEST_SIZE * sizeof(dst[0]));
> > + dst[0] = (src[0] + 4) >> 3;
> > +
> > + for (i = 1; i < DEST_SIZE; i++) {
> > + int level = src[i];
> > + if (((unsigned)(level + threshold1)) > threshold2) {
> > + const int j = permutation[i];
> > + if (level > 0) dst[j] = (level - threshold1 + 4) >> 3;
> > + else dst[j] = (level + threshold1 + 4) >> 3;
> > + }
> > + }
> > +}
>
> these 2 functions are unused, they can be removed
>
>
> [...]
> > + for(i=0; i<count; i++){
> > + const int x1= offset[i+count-1][0];
> > + const int y1= offset[i+count-1][1];
> > + int offset;
> > + p->frame->data[0]= p->src[0] + x1 + y1 * p->frame->linesize[0];
> > + p->frame->data[1]= p->src[1] + x1/2 + y1/2 *
> p->frame->linesize[1];
> > + p->frame->data[2]= p->src[2] + x1/2 + y1/2 *
> p->frame->linesize[2];
> > +
> > + avcodec_encode_video(p->avctx_enc[i], p->outbuf,
> p->outbuf_size, p->frame);
> > + p->frame_dec = p->avctx_enc[i]->coded_frame;
> > +
> > + p->frame->format = p->avctx_enc[i]->pix_fmt;
>
> p->frame width and height should be set too
>
>
> [...]
> > diff --git a/libavfilter/vf_uspp.h b/libavfilter/vf_uspp.h
> > new file mode 100644
> > index 0000000..143e6a5
> > --- /dev/null
> > +++ b/libavfilter/vf_uspp.h
> > @@ -0,0 +1,55 @@
> > +/*
> > + * Copyright (c) 2003 Michael Niedermayer <michaelni at gmx.at>
> > + * 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.
> > + */
> > +
> > +#ifndef AVFILTER_USPP_H
> > +#define AVFILTER_USPP_H
> > +
> > +#include "libavcodec/avcodec.h"
> > +#include "avfilter.h"
> > +
> > +#define MAX_LEVEL 8 /* quality levels */
> > +#define BLOCK 16
> > +
> > +typedef struct {
> > + const AVClass *av_class;
> > + int log2_count;
> > + int qp;
> > + int mode;
> > + int qscale_type;
> > + int temp_stride[3];
> > + uint8_t *src[3];
> > + int16_t *temp[3];
> > + int outbuf_size;
> > + uint8_t *outbuf;
> > + AVCodecContext *avctx_enc[BLOCK*BLOCK];
> > + AVFrame *frame;
> > + AVFrame *frame_dec;
> > + uint8_t *non_b_qp_table;
> > + int non_b_qp_alloc_size;
> > + int use_bframe_qp;
>
> > + void (*requantize)(int16_t dst[64], const int16_t src[64],
> > + int qp, const uint8_t *permutation);
>
> this function pointer is never called, it can be removed
>
> [...]
> --
> Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
>
> Breaking DRM is a little like attempting to break through a door even
> though the window is wide open and the only thing in the house is a bunch
> of things you dont want and which you would get tomorrow for free anyway
>
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> ffmpeg-devel at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
>
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