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https://github.com/FFmpeg/FFmpeg.git
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790f793844
There are lots of files that don't need it: The number of object files that actually need it went down from 2011 to 884 here. Keep it for external users in order to not cause breakages. Also improve the other headers a bit while just at it. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
185 lines
5.5 KiB
C
185 lines
5.5 KiB
C
/*
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* Copyright (c) 2014 Nicholas Robbins
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* remove judder in video stream
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*
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* Algorithm:
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* - If the old packets had PTS of old_pts[i]. Replace these with new
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* value based on the running average of the last n=cycle frames. So
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*
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* new_pts[i] = Sum(k=i-n+1, i, old_pts[k])/n
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* + (old_pts[i]-old_pts[i-n])*(n-1)/2n
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*
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* For any repeating pattern of length n of judder this will produce
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* an even progression of PTS's.
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*
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* - In order to avoid calculating this sum ever frame, a running tally
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* is maintained in ctx->new_pts. Each frame the new term at the start
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* of the sum is added, the one and the end is removed, and the offset
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* terms (second line in formula above) are recalculated.
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*
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* - To aid in this a ringbuffer of the last n-2 PTS's is maintained in
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* ctx->ringbuff. With the indices of the first two and last two entries
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* stored in i1, i2, i3, & i4.
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*
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* - To ensure that the new PTS's are integers, time_base is divided
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* by 2n. This removes the division in the new_pts calculation.
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*
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* - frame_rate is also multiplied by 2n to allow the frames to fall
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* where they may in what may now be a VFR output. This produces more
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* even output then setting frame_rate=1/0 in practice.
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*/
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#include "libavutil/mem.h"
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#include "libavutil/opt.h"
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#include "avfilter.h"
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#include "internal.h"
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typedef struct DejudderContext {
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const AVClass *class;
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int64_t *ringbuff;
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int i1, i2, i3, i4;
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int64_t new_pts;
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int start_count;
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/* options */
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int cycle;
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} DejudderContext;
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#define OFFSET(x) offsetof(DejudderContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption dejudder_options[] = {
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{"cycle", "set the length of the cycle to use for dejuddering",
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OFFSET(cycle), AV_OPT_TYPE_INT, {.i64 = 4}, 2, 240, .flags = FLAGS},
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{NULL}
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};
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AVFILTER_DEFINE_CLASS(dejudder);
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static int config_out_props(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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DejudderContext *s = ctx->priv;
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AVFilterLink *inlink = outlink->src->inputs[0];
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outlink->time_base = av_mul_q(inlink->time_base, av_make_q(1, 2 * s->cycle));
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outlink->frame_rate = av_mul_q(inlink->frame_rate, av_make_q(2 * s->cycle, 1));
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av_log(ctx, AV_LOG_VERBOSE, "cycle:%d\n", s->cycle);
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return 0;
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}
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static av_cold int dejudder_init(AVFilterContext *ctx)
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{
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DejudderContext *s = ctx->priv;
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s->ringbuff = av_calloc(s->cycle + 2, sizeof(*s->ringbuff));
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if (!s->ringbuff)
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return AVERROR(ENOMEM);
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s->new_pts = 0;
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s->i1 = 0;
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s->i2 = 1;
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s->i3 = 2;
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s->i4 = 3;
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s->start_count = s->cycle + 2;
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return 0;
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}
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static av_cold void dejudder_uninit(AVFilterContext *ctx)
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{
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DejudderContext *s = ctx->priv;
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av_freep(&(s->ringbuff));
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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int k;
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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DejudderContext *s = ctx->priv;
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int64_t *judbuff = s->ringbuff;
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int64_t next_pts = frame->pts;
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int64_t offset;
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if (next_pts == AV_NOPTS_VALUE)
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return ff_filter_frame(outlink, frame);
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if (s->start_count) {
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s->start_count--;
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s->new_pts = next_pts * 2 * s->cycle;
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} else {
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if (next_pts < judbuff[s->i2]) {
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offset = next_pts + judbuff[s->i3] - judbuff[s->i4] - judbuff[s->i1];
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for (k = 0; k < s->cycle + 2; k++)
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judbuff[k] += offset;
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}
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s->new_pts += (s->cycle - 1) * (judbuff[s->i3] - judbuff[s->i1])
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+ (s->cycle + 1) * (next_pts - judbuff[s->i4]);
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}
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judbuff[s->i2] = next_pts;
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s->i1 = s->i2;
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s->i2 = s->i3;
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s->i3 = s->i4;
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s->i4 = (s->i4 + 1) % (s->cycle + 2);
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frame->pts = s->new_pts;
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for (k = 0; k < s->cycle + 2; k++)
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av_log(ctx, AV_LOG_DEBUG, "%"PRId64"\t", judbuff[k]);
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av_log(ctx, AV_LOG_DEBUG, "next=%"PRId64", new=%"PRId64"\n", next_pts, frame->pts);
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return ff_filter_frame(outlink, frame);
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}
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static const AVFilterPad dejudder_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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},
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};
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static const AVFilterPad dejudder_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_out_props,
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},
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};
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const AVFilter ff_vf_dejudder = {
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.name = "dejudder",
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.description = NULL_IF_CONFIG_SMALL("Remove judder produced by pullup."),
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.priv_size = sizeof(DejudderContext),
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.priv_class = &dejudder_class,
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FILTER_INPUTS(dejudder_inputs),
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FILTER_OUTPUTS(dejudder_outputs),
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.init = dejudder_init,
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.uninit = dejudder_uninit,
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};
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