138 lines
4.0 KiB
C
138 lines
4.0 KiB
C
/*
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* Copyright (c) 2007 Bobby Bingham
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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 vertical flip filter
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*/
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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 "internal.h"
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#include "video.h"
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typedef struct FlipContext {
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int vsub; ///< vertical chroma subsampling
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int bayer;
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} FlipContext;
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static int config_input(AVFilterLink *link)
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{
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FlipContext *flip = link->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
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flip->vsub = desc->log2_chroma_h;
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flip->bayer = !!(desc->flags & AV_PIX_FMT_FLAG_BAYER);
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return 0;
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}
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static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
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{
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FlipContext *flip = link->dst->priv;
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AVFrame *frame;
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int i;
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frame = ff_get_video_buffer(link->dst->outputs[0], w, h);
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if (!frame)
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return NULL;
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for (i = 0; i < 4; i ++) {
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int vsub = i == 1 || i == 2 ? flip->vsub : 0;
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int height = AV_CEIL_RSHIFT(h, vsub);
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if (frame->data[i]) {
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frame->data[i] += (height - 1) * frame->linesize[i];
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frame->linesize[i] = -frame->linesize[i];
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}
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}
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return frame;
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}
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static int flip_bayer(AVFilterLink *link, AVFrame *in)
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{
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AVFilterContext *ctx = link->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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AVFrame *out;
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uint8_t *inrow = in->data[0], *outrow;
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int i, width = outlink->w << (av_pix_fmt_desc_get(link->format)->comp[0].step > 1);
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if (outlink->h & 1) {
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av_log(ctx, AV_LOG_ERROR, "Bayer vertical flip needs even height\n");
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return AVERROR_INVALIDDATA;
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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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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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outrow = out->data[0] + out->linesize[0] * (outlink->h - 2);
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for (i = 0; i < outlink->h >> 1; i++) {
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memcpy(outrow, inrow, width);
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memcpy(outrow + out->linesize[0], inrow + in->linesize[0], width);
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inrow += 2 * in->linesize[0];
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outrow -= 2 * out->linesize[0];
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}
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av_frame_free(&in);
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return ff_filter_frame(outlink, out);
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}
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static int filter_frame(AVFilterLink *link, AVFrame *frame)
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{
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FlipContext *flip = link->dst->priv;
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int i;
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if (flip->bayer)
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return flip_bayer(link, frame);
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for (i = 0; i < 4; i ++) {
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int vsub = i == 1 || i == 2 ? flip->vsub : 0;
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int height = AV_CEIL_RSHIFT(link->h, vsub);
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if (frame->data[i]) {
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frame->data[i] += (height - 1) * frame->linesize[i];
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frame->linesize[i] = -frame->linesize[i];
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}
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}
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return ff_filter_frame(link->dst->outputs[0], frame);
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}
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static const AVFilterPad avfilter_vf_vflip_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.get_buffer.video = get_video_buffer,
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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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const AVFilter ff_vf_vflip = {
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.name = "vflip",
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.description = NULL_IF_CONFIG_SMALL("Flip the input video vertically."),
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.priv_size = sizeof(FlipContext),
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FILTER_INPUTS(avfilter_vf_vflip_inputs),
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FILTER_OUTPUTS(ff_video_default_filterpad),
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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