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8be701d9f7
Up until now, an AVFilter's lists of input and output AVFilterPads were terminated by a sentinel and the only way to get the length of these lists was by using avfilter_pad_count(). This has two drawbacks: first, sizeof(AVFilterPad) is not negligible (i.e. 64B on 64bit systems); second, getting the size involves a function call instead of just reading the data. This commit therefore changes this. The sentinels are removed and new private fields nb_inputs and nb_outputs are added to AVFilter that contain the number of elements of the respective AVFilterPad array. Given that AVFilter.(in|out)puts are the only arrays of zero-terminated AVFilterPads an API user has access to (AVFilterContext.(in|out)put_pads are not zero-terminated and they already have a size field) the argument to avfilter_pad_count() is always one of these lists, so it just has to find the filter the list belongs to and read said number. This is slower than before, but a replacement function that just reads the internal numbers that users are expected to switch to will be added soon; and furthermore, avfilter_pad_count() is probably never called in hot loops anyway. This saves about 49KiB from the binary; notice that these sentinels are not in .bss despite being zeroed: they are in .data.rel.ro due to the non-sentinels. Reviewed-by: Nicolas George <george@nsup.org> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
183 lines
4.8 KiB
C
183 lines
4.8 KiB
C
/*
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* Copyright (c) 2013 Paul B Mahol
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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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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "filters.h"
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#include "internal.h"
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typedef struct SeparateFieldsContext {
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int nb_planes;
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AVFrame *second;
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} SeparateFieldsContext;
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static int config_props_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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SeparateFieldsContext *s = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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s->nb_planes = av_pix_fmt_count_planes(inlink->format);
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if (inlink->h & 1) {
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av_log(ctx, AV_LOG_ERROR, "height must be even\n");
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return AVERROR_INVALIDDATA;
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}
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outlink->time_base.num = inlink->time_base.num;
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outlink->time_base.den = inlink->time_base.den * 2;
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outlink->frame_rate.num = inlink->frame_rate.num * 2;
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outlink->frame_rate.den = inlink->frame_rate.den;
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outlink->w = inlink->w;
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outlink->h = inlink->h / 2;
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return 0;
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}
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static void extract_field(AVFrame *frame, int nb_planes, int type)
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{
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int i;
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for (i = 0; i < nb_planes; i++) {
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if (type)
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frame->data[i] = frame->data[i] + frame->linesize[i];
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frame->linesize[i] *= 2;
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}
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
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{
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AVFilterContext *ctx = inlink->dst;
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SeparateFieldsContext *s = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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int ret;
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inpicref->height = outlink->h;
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inpicref->interlaced_frame = 0;
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if (!s->second) {
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goto clone;
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} else {
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AVFrame *second = s->second;
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extract_field(second, s->nb_planes, second->top_field_first);
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if (second->pts != AV_NOPTS_VALUE &&
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inpicref->pts != AV_NOPTS_VALUE)
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second->pts += inpicref->pts;
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else
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second->pts = AV_NOPTS_VALUE;
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ret = ff_filter_frame(outlink, second);
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if (ret < 0)
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return ret;
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clone:
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s->second = av_frame_clone(inpicref);
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if (!s->second)
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return AVERROR(ENOMEM);
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}
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extract_field(inpicref, s->nb_planes, !inpicref->top_field_first);
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if (inpicref->pts != AV_NOPTS_VALUE)
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inpicref->pts *= 2;
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return ff_filter_frame(outlink, inpicref);
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}
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static int flush_frame(AVFilterLink *outlink, int64_t pts, int64_t *out_pts)
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{
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AVFilterContext *ctx = outlink->src;
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SeparateFieldsContext *s = ctx->priv;
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int ret = 0;
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if (s->second) {
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*out_pts = s->second->pts += pts;
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extract_field(s->second, s->nb_planes, s->second->top_field_first);
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ret = ff_filter_frame(outlink, s->second);
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s->second = NULL;
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}
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return ret;
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}
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static int activate(AVFilterContext *ctx)
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{
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AVFilterLink *inlink = ctx->inputs[0];
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AVFilterLink *outlink = ctx->outputs[0];
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AVFrame *in;
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int64_t pts;
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int ret, status;
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FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
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ret = ff_inlink_consume_frame(inlink, &in);
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if (ret < 0)
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return ret;
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if (ret > 0)
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return filter_frame(inlink, in);
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if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
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if (status == AVERROR_EOF) {
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int64_t out_pts = pts;
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ret = flush_frame(outlink, pts, &out_pts);
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ff_outlink_set_status(outlink, status, out_pts);
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return ret;
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}
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}
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FF_FILTER_FORWARD_WANTED(outlink, inlink);
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return FFERROR_NOT_READY;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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SeparateFieldsContext *s = ctx->priv;
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av_frame_free(&s->second);
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}
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static const AVFilterPad separatefields_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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};
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static const AVFilterPad separatefields_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_props_output,
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},
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};
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const AVFilter ff_vf_separatefields = {
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.name = "separatefields",
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.description = NULL_IF_CONFIG_SMALL("Split input video frames into fields."),
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.priv_size = sizeof(SeparateFieldsContext),
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.activate = activate,
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.uninit = uninit,
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FILTER_INPUTS(separatefields_inputs),
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FILTER_OUTPUTS(separatefields_outputs),
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};
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