mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
b211607b5c
Signed-off-by: Paul B Mahol <onemda@gmail.com>
176 lines
5.2 KiB
C
176 lines
5.2 KiB
C
/*
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* Copyright (c) 2007 Benoit Fouet
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* Copyright (c) 2010 Stefano Sabatini
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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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* horizontal flip filter
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*/
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#include <string.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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#include "libavutil/pixdesc.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/imgutils.h"
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typedef struct {
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int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes
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int hsub, vsub; ///< chroma subsampling
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} FlipContext;
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *pix_fmts = NULL;
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int fmt;
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for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) {
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
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if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
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desc->flags & AV_PIX_FMT_FLAG_BITSTREAM ||
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(desc->log2_chroma_w != desc->log2_chroma_h &&
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desc->comp[0].plane == desc->comp[1].plane)))
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ff_add_format(&pix_fmts, fmt);
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}
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ff_set_common_formats(ctx, pix_fmts);
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return 0;
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}
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static int config_props(AVFilterLink *inlink)
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{
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FlipContext *s = inlink->dst->priv;
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const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
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av_image_fill_max_pixsteps(s->max_step, NULL, pix_desc);
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s->hsub = pix_desc->log2_chroma_w;
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s->vsub = pix_desc->log2_chroma_h;
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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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FlipContext *s = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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AVFrame *out;
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uint8_t *inrow, *outrow;
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int i, j, plane, step;
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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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/* copy palette if required */
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if (av_pix_fmt_desc_get(inlink->format)->flags & AV_PIX_FMT_FLAG_PAL)
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memcpy(out->data[1], in->data[1], AVPALETTE_SIZE);
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for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
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const int width = (plane == 1 || plane == 2) ? FF_CEIL_RSHIFT(inlink->w, s->hsub) : inlink->w;
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const int height = (plane == 1 || plane == 2) ? FF_CEIL_RSHIFT(inlink->h, s->vsub) : inlink->h;
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step = s->max_step[plane];
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outrow = out->data[plane];
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inrow = in ->data[plane] + (width - 1) * step;
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for (i = 0; i < height; i++) {
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switch (step) {
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case 1:
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for (j = 0; j < width; j++)
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outrow[j] = inrow[-j];
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break;
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case 2:
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{
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uint16_t *outrow16 = (uint16_t *)outrow;
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uint16_t * inrow16 = (uint16_t *) inrow;
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for (j = 0; j < width; j++)
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outrow16[j] = inrow16[-j];
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}
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break;
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case 3:
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{
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uint8_t *in = inrow;
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uint8_t *out = outrow;
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for (j = 0; j < width; j++, out += 3, in -= 3) {
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int32_t v = AV_RB24(in);
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AV_WB24(out, v);
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}
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}
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break;
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case 4:
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{
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uint32_t *outrow32 = (uint32_t *)outrow;
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uint32_t * inrow32 = (uint32_t *) inrow;
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for (j = 0; j < width; j++)
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outrow32[j] = inrow32[-j];
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}
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break;
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default:
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for (j = 0; j < width; j++)
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memcpy(outrow + j*step, inrow - j*step, step);
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}
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inrow += in ->linesize[plane];
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outrow += out->linesize[plane];
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}
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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 const AVFilterPad avfilter_vf_hflip_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_props,
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},
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{ NULL }
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};
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static const AVFilterPad avfilter_vf_hflip_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_hflip = {
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.name = "hflip",
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.description = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."),
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.priv_size = sizeof(FlipContext),
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.query_formats = query_formats,
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.inputs = avfilter_vf_hflip_inputs,
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.outputs = avfilter_vf_hflip_outputs,
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};
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