mirror of https://git.ffmpeg.org/ffmpeg.git
209 lines
6.5 KiB
C
209 lines
6.5 KiB
C
/*
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* Copyright (c) 2011 Mark Himsley
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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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* video field order filter, heavily influenced by vf_pad.c
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*/
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/* #define DEBUG */
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#include <stdio.h>
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#include <string.h>
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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typedef struct
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{
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unsigned int dst_tff; ///< output bff/tff
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int line_size[4]; ///< bytes of pixel data per line for each plane
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} FieldOrderContext;
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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FieldOrderContext *fieldorder = ctx->priv;
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const char *tff = "tff";
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const char *bff = "bff";
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if (!args) {
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fieldorder->dst_tff = 1;
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} else if (sscanf(args, "%u", &fieldorder->dst_tff) == 1) {
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fieldorder->dst_tff = !!fieldorder->dst_tff;
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} else if (!strcmp(tff, args)) {
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fieldorder->dst_tff = 1;
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} else if (!strcmp(bff, args)) {
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fieldorder->dst_tff = 0;
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} else {
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av_log(ctx, AV_LOG_ERROR, "Invalid argument '%s'.\n", args);
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return AVERROR(EINVAL);
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}
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av_log(ctx, AV_LOG_VERBOSE, "output field order: %s\n",
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fieldorder->dst_tff ? tff : bff);
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats;
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enum AVPixelFormat pix_fmt;
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int ret;
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/** accept any input pixel format that is not hardware accelerated, not
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* a bitstream format, and does not have vertically sub-sampled chroma */
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if (ctx->inputs[0]) {
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formats = NULL;
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for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++) {
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
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if (!(desc->flags & PIX_FMT_HWACCEL ||
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desc->flags & PIX_FMT_BITSTREAM) &&
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desc->nb_components && !desc->log2_chroma_h &&
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(ret = ff_add_format(&formats, pix_fmt)) < 0) {
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ff_formats_unref(&formats);
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return ret;
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}
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}
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ff_formats_ref(formats, &ctx->inputs[0]->out_formats);
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ff_formats_ref(formats, &ctx->outputs[0]->in_formats);
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}
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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FieldOrderContext *fieldorder = ctx->priv;
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int plane;
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/** full an array with the number of bytes that the video
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* data occupies per line for each plane of the input video */
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for (plane = 0; plane < 4; plane++) {
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fieldorder->line_size[plane] = av_image_get_linesize(
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inlink->format,
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inlink->w,
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plane);
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}
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return 0;
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}
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static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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return ff_get_video_buffer(outlink, w, h);
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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AVFilterContext *ctx = inlink->dst;
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FieldOrderContext *s = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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int h, plane, line_step, line_size, line;
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uint8_t *data;
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if (!frame->interlaced_frame ||
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frame->top_field_first == s->dst_tff)
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return ff_filter_frame(outlink, frame);
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av_dlog(ctx,
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"picture will move %s one line\n",
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s->dst_tff ? "up" : "down");
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h = frame->height;
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for (plane = 0; plane < 4 && frame->data[plane]; plane++) {
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line_step = frame->linesize[plane];
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line_size = s->line_size[plane];
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data = frame->data[plane];
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if (s->dst_tff) {
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/** Move every line up one line, working from
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* the top to the bottom of the frame.
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* The original top line is lost.
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* The new last line is created as a copy of the
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* penultimate line from that field. */
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for (line = 0; line < h; line++) {
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if (1 + line < frame->height) {
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memcpy(data, data + line_step, line_size);
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} else {
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memcpy(data, data - line_step - line_step, line_size);
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}
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data += line_step;
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}
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} else {
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/** Move every line down one line, working from
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* the bottom to the top of the frame.
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* The original bottom line is lost.
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* The new first line is created as a copy of the
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* second line from that field. */
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data += (h - 1) * line_step;
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for (line = h - 1; line >= 0 ; line--) {
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if (line > 0) {
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memcpy(data, data - line_step, line_size);
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} else {
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memcpy(data, data + line_step + line_step, line_size);
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}
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data -= line_step;
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}
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}
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}
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frame->top_field_first = s->dst_tff;
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return ff_filter_frame(outlink, frame);
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}
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static const AVFilterPad avfilter_vf_fieldorder_inputs[] = {
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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_input,
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.get_video_buffer = get_video_buffer,
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.filter_frame = filter_frame,
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.needs_writable = 1,
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},
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{ NULL }
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};
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static const AVFilterPad avfilter_vf_fieldorder_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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{ NULL }
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};
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AVFilter avfilter_vf_fieldorder = {
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.name = "fieldorder",
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.description = NULL_IF_CONFIG_SMALL("Set the field order."),
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.init = init,
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.priv_size = sizeof(FieldOrderContext),
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.query_formats = query_formats,
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.inputs = avfilter_vf_fieldorder_inputs,
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.outputs = avfilter_vf_fieldorder_outputs,
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};
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