mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-25 19:01:51 +02:00
193 lines
6.2 KiB
C
193 lines
6.2 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/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "internal.h"
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typedef struct WeaveContext {
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const AVClass *class;
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int first_field;
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int double_weave;
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int nb_planes;
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int planeheight[4];
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int linesize[4];
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AVFrame *prev;
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} WeaveContext;
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#define OFFSET(x) offsetof(WeaveContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption weave_options[] = {
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{ "first_field", "set first field", OFFSET(first_field), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "field"},
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{ "top", "set top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
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{ "t", "set top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
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{ "bottom", "set bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
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{ "b", "set bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(weave);
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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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WeaveContext *s = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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int ret;
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if (!s->double_weave) {
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outlink->time_base.num = inlink->time_base.num * 2;
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outlink->time_base.den = inlink->time_base.den;
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outlink->frame_rate.num = inlink->frame_rate.num;
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outlink->frame_rate.den = inlink->frame_rate.den * 2;
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}
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outlink->w = inlink->w;
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outlink->h = inlink->h * 2;
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if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
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return ret;
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s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
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s->planeheight[0] = s->planeheight[3] = inlink->h;
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s->nb_planes = av_pix_fmt_count_planes(inlink->format);
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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WeaveContext *s = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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AVFrame *out;
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int i;
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if (!s->prev) {
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s->prev = in;
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return 0;
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}
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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av_frame_free(&s->prev);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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for (i = 0; i < s->nb_planes; i++) {
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if (s->double_weave && !(inlink->frame_count_out & 1)) {
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av_image_copy_plane(out->data[i] + out->linesize[i] * !s->first_field,
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out->linesize[i] * 2,
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in->data[i], in->linesize[i],
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s->linesize[i], s->planeheight[i]);
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av_image_copy_plane(out->data[i] + out->linesize[i] * s->first_field,
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out->linesize[i] * 2,
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s->prev->data[i], s->prev->linesize[i],
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s->linesize[i], s->planeheight[i]);
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} else {
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av_image_copy_plane(out->data[i] + out->linesize[i] * s->first_field,
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out->linesize[i] * 2,
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in->data[i], in->linesize[i],
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s->linesize[i], s->planeheight[i]);
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av_image_copy_plane(out->data[i] + out->linesize[i] * !s->first_field,
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out->linesize[i] * 2,
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s->prev->data[i], s->prev->linesize[i],
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s->linesize[i], s->planeheight[i]);
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}
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}
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out->pts = s->double_weave ? s->prev->pts : in->pts / 2;
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out->interlaced_frame = 1;
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out->top_field_first = !s->first_field;
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if (!s->double_weave)
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av_frame_free(&in);
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av_frame_free(&s->prev);
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if (s->double_weave)
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s->prev = in;
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return ff_filter_frame(outlink, out);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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WeaveContext *s = ctx->priv;
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av_frame_free(&s->prev);
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}
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static const AVFilterPad weave_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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{ NULL }
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};
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static const AVFilterPad weave_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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{ NULL }
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};
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AVFilter ff_vf_weave = {
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.name = "weave",
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.description = NULL_IF_CONFIG_SMALL("Weave input video fields into frames."),
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.priv_size = sizeof(WeaveContext),
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.priv_class = &weave_class,
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.uninit = uninit,
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.inputs = weave_inputs,
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.outputs = weave_outputs,
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};
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static av_cold int init(AVFilterContext *ctx)
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{
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WeaveContext *s = ctx->priv;
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if (!strcmp(ctx->filter->name, "doubleweave"))
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s->double_weave = 1;
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return 0;
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}
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#define doubleweave_options weave_options
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AVFILTER_DEFINE_CLASS(doubleweave);
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AVFilter ff_vf_doubleweave = {
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.name = "doubleweave",
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.description = NULL_IF_CONFIG_SMALL("Weave input video fields into double number of frames."),
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.priv_size = sizeof(WeaveContext),
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.priv_class = &doubleweave_class,
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.init = init,
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.uninit = uninit,
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.inputs = weave_inputs,
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.outputs = weave_outputs,
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};
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