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ffmpeg / libavfilter / vf_hflip.c @ 2912e87a

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/*
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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 Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; 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 "avfilter.h"
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#include "libavutil/pixdesc.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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    static const enum PixelFormat pix_fmts[] = {
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        PIX_FMT_RGB48BE,      PIX_FMT_RGB48LE,
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        PIX_FMT_ARGB,         PIX_FMT_RGBA,
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        PIX_FMT_ABGR,         PIX_FMT_BGRA,
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        PIX_FMT_RGB24,        PIX_FMT_BGR24,
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        PIX_FMT_RGB565BE,     PIX_FMT_RGB565LE,
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        PIX_FMT_RGB555BE,     PIX_FMT_RGB555LE,
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        PIX_FMT_BGR565BE,     PIX_FMT_BGR565LE,
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        PIX_FMT_BGR555BE,     PIX_FMT_BGR555LE,
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        PIX_FMT_GRAY16BE,     PIX_FMT_GRAY16LE,
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        PIX_FMT_YUV420P16LE,  PIX_FMT_YUV420P16BE,
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        PIX_FMT_YUV422P16LE,  PIX_FMT_YUV422P16BE,
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        PIX_FMT_YUV444P16LE,  PIX_FMT_YUV444P16BE,
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        PIX_FMT_YUV444P,      PIX_FMT_YUV422P,
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        PIX_FMT_YUV420P,      PIX_FMT_YUV411P,
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        PIX_FMT_YUV410P,      PIX_FMT_YUV440P,
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        PIX_FMT_YUVJ444P,     PIX_FMT_YUVJ422P,
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        PIX_FMT_YUVJ420P,     PIX_FMT_YUVJ440P,
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        PIX_FMT_YUVA420P,
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        PIX_FMT_RGB8,         PIX_FMT_BGR8,
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        PIX_FMT_RGB4_BYTE,    PIX_FMT_BGR4_BYTE,
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        PIX_FMT_PAL8,         PIX_FMT_GRAY8,
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        PIX_FMT_NONE
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    };
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    avfilter_set_common_formats(ctx, avfilter_make_format_list(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 *flip = inlink->dst->priv;
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    const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
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    av_image_fill_max_pixsteps(flip->max_step, NULL, pix_desc);
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    flip->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
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    flip->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
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    return 0;
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}
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static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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{
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    FlipContext *flip = inlink->dst->priv;
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    AVFilterBufferRef *inpic  = inlink->cur_buf;
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    AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
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    uint8_t *inrow, *outrow;
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    int i, j, plane, step, hsub, vsub;
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    for (plane = 0; plane < 4 && inpic->data[plane]; plane++) {
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        step = flip->max_step[plane];
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        hsub = (plane == 1 || plane == 2) ? flip->hsub : 0;
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        vsub = (plane == 1 || plane == 2) ? flip->vsub : 0;
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        outrow = outpic->data[plane] + (y>>vsub) * outpic->linesize[plane];
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        inrow  = inpic ->data[plane] + (y>>vsub) * inpic ->linesize[plane] + ((inlink->w >> hsub) - 1) * step;
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        for (i = 0; i < h>>vsub; i++) {
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            switch (step) {
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            case 1:
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            {
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                for (j = 0; j < (inlink->w >> hsub); j++)
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                    outrow[j] = inrow[-j];
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            }
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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 < (inlink->w >> hsub); 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 < (inlink->w >> hsub); 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 < (inlink->w >> hsub); 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 < (inlink->w >> hsub); j++)
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                    memcpy(outrow + j*step, inrow - j*step, step);
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            }
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            inrow  += inpic ->linesize[plane];
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            outrow += outpic->linesize[plane];
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        }
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    }
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    avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
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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    = (AVFilterPad[]) {{ .name            = "default",
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                                    .type            = AVMEDIA_TYPE_VIDEO,
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                                    .draw_slice      = draw_slice,
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                                    .config_props    = config_props,
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                                    .min_perms       = AV_PERM_READ, },
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                                  { .name = NULL}},
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    .outputs   = (AVFilterPad[]) {{ .name            = "default",
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                                    .type            = AVMEDIA_TYPE_VIDEO, },
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                                  { .name = NULL}},
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};