mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
31a373ce71
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
183 lines
5.4 KiB
C
183 lines
5.4 KiB
C
/*
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* Copyright (c) 2003 Tobias Diedrich
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 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 "avfilter.h"
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#include "internal.h"
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typedef struct RepeatFieldsContext {
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const AVClass *class;
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int state;
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int nb_planes;
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int linesize[4];
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int planeheight[4];
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AVFrame *frame;
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} RepeatFieldsContext;
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static av_cold void uninit(AVFilterContext *ctx)
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{
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RepeatFieldsContext *s = ctx->priv;
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av_frame_free(&s->frame);
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}
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static const enum AVPixelFormat pixel_fmts_eq[] = {
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AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_YUV410P,
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AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV444P,
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AV_PIX_FMT_NONE
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};
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static int config_input(AVFilterLink *inlink)
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{
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RepeatFieldsContext *s = inlink->dst->priv;
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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 ((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 void update_pts(AVFilterLink *link, AVFrame *f, int64_t pts, int fields)
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{
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if (av_cmp_q(link->frame_rate, (AVRational){30000, 1001}) == 0 &&
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av_cmp_q(link->time_base, (AVRational){1001, 60000}) <= 0
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) {
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f->pts = pts + av_rescale_q(fields, (AVRational){1001, 60000}, link->time_base);
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} else
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f->pts = AV_NOPTS_VALUE;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in) {
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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RepeatFieldsContext *s = ctx->priv;
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AVFrame *out;
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int ret, i;
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int state = s->state;
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if (!s->frame) {
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s->frame = av_frame_clone(in);
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if (!s->frame)
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return AVERROR(ENOMEM);
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s->frame->pts = AV_NOPTS_VALUE;
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}
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out = s->frame;
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if ((state == 0 && !in->top_field_first) ||
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(state == 1 && in->top_field_first)) {
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av_log(ctx, AV_LOG_WARNING, "Unexpected field flags: "
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"state=%d top_field_first=%d repeat_first_field=%d\n",
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state, in->top_field_first, in->repeat_pict);
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state ^= 1;
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}
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if (state == 0) {
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AVFrame *new;
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new = av_frame_clone(in);
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if (!new)
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return AVERROR(ENOMEM);
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ret = ff_filter_frame(outlink, new);
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if (in->repeat_pict) {
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av_frame_make_writable(out);
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update_pts(outlink, out, in->pts, 2);
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for (i = 0; i < s->nb_planes; i++) {
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av_image_copy_plane(out->data[i], out->linesize[i] * 2,
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in->data[i], in->linesize[i] * 2,
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s->linesize[i], s->planeheight[i] / 2);
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}
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state = 1;
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}
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} else {
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for (i = 0; i < s->nb_planes; i++) {
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av_frame_make_writable(out);
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av_image_copy_plane(out->data[i] + out->linesize[i], out->linesize[i] * 2,
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in->data[i] + in->linesize[i], in->linesize[i] * 2,
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s->linesize[i], s->planeheight[i] / 2);
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}
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ret = ff_filter_frame(outlink, av_frame_clone(out));
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if (in->repeat_pict) {
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AVFrame *new;
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new = av_frame_clone(in);
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if (!new)
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return AVERROR(ENOMEM);
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ret = ff_filter_frame(outlink, new);
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state = 0;
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} else {
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av_frame_make_writable(out);
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update_pts(outlink, out, in->pts, 1);
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for (i = 0; i < s->nb_planes; i++) {
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av_image_copy_plane(out->data[i], out->linesize[i] * 2,
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in->data[i], in->linesize[i] * 2,
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s->linesize[i], s->planeheight[i] / 2);
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}
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}
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}
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s->state = state;
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av_frame_free(&in);
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return ret;
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}
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static const AVFilterPad repeatfields_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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.config_props = config_input,
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},
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};
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static const AVFilterPad repeatfields_outputs[] = {
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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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const AVFilter ff_vf_repeatfields = {
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.name = "repeatfields",
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.description = NULL_IF_CONFIG_SMALL("Hard repeat fields based on MPEG repeat field flag."),
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.priv_size = sizeof(RepeatFieldsContext),
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.uninit = uninit,
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FILTER_INPUTS(repeatfields_inputs),
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FILTER_OUTPUTS(repeatfields_outputs),
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FILTER_PIXFMTS_ARRAY(pixel_fmts_eq),
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};
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